Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * xml.c
4 : * XML data type support.
5 : *
6 : *
7 : * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
8 : * Portions Copyright (c) 1994, Regents of the University of California
9 : *
10 : * src/backend/utils/adt/xml.c
11 : *
12 : *-------------------------------------------------------------------------
13 : */
14 :
15 : /*
16 : * Generally, XML type support is only available when libxml use was
17 : * configured during the build. But even if that is not done, the
18 : * type and all the functions are available, but most of them will
19 : * fail. For one thing, this avoids having to manage variant catalog
20 : * installations. But it also has nice effects such as that you can
21 : * dump a database containing XML type data even if the server is not
22 : * linked with libxml. Thus, make sure xml_out() works even if nothing
23 : * else does.
24 : */
25 :
26 : /*
27 : * Notes on memory management:
28 : *
29 : * Sometimes libxml allocates global structures in the hope that it can reuse
30 : * them later on. This makes it impractical to change the xmlMemSetup
31 : * functions on-the-fly; that is likely to lead to trying to pfree() chunks
32 : * allocated with malloc() or vice versa. Since libxml might be used by
33 : * loadable modules, eg libperl, our only safe choices are to change the
34 : * functions at postmaster/backend launch or not at all. Since we'd rather
35 : * not activate libxml in sessions that might never use it, the latter choice
36 : * is the preferred one. However, for debugging purposes it can be awfully
37 : * handy to constrain libxml's allocations to be done in a specific palloc
38 : * context, where they're easy to track. Therefore there is code here that
39 : * can be enabled in debug builds to redirect libxml's allocations into a
40 : * special context LibxmlContext. It's not recommended to turn this on in
41 : * a production build because of the possibility of bad interactions with
42 : * external modules.
43 : */
44 : /* #define USE_LIBXMLCONTEXT */
45 :
46 : #include "postgres.h"
47 :
48 : #ifdef USE_LIBXML
49 : #include <libxml/chvalid.h>
50 : #include <libxml/entities.h>
51 : #include <libxml/parser.h>
52 : #include <libxml/parserInternals.h>
53 : #include <libxml/tree.h>
54 : #include <libxml/uri.h>
55 : #include <libxml/xmlerror.h>
56 : #include <libxml/xmlsave.h>
57 : #include <libxml/xmlversion.h>
58 : #include <libxml/xmlwriter.h>
59 : #include <libxml/xpath.h>
60 : #include <libxml/xpathInternals.h>
61 :
62 : /*
63 : * We used to check for xmlStructuredErrorContext via a configure test; but
64 : * that doesn't work on Windows, so instead use this grottier method of
65 : * testing the library version number.
66 : */
67 : #if LIBXML_VERSION >= 20704
68 : #define HAVE_XMLSTRUCTUREDERRORCONTEXT 1
69 : #endif
70 :
71 : /*
72 : * libxml2 2.12 decided to insert "const" into the error handler API.
73 : */
74 : #if LIBXML_VERSION >= 21200
75 : #define PgXmlErrorPtr const xmlError *
76 : #else
77 : #define PgXmlErrorPtr xmlErrorPtr
78 : #endif
79 :
80 : #endif /* USE_LIBXML */
81 :
82 : #include "access/htup_details.h"
83 : #include "access/table.h"
84 : #include "catalog/namespace.h"
85 : #include "catalog/pg_class.h"
86 : #include "catalog/pg_type.h"
87 : #include "commands/dbcommands.h"
88 : #include "executor/spi.h"
89 : #include "executor/tablefunc.h"
90 : #include "fmgr.h"
91 : #include "lib/stringinfo.h"
92 : #include "libpq/pqformat.h"
93 : #include "mb/pg_wchar.h"
94 : #include "miscadmin.h"
95 : #include "nodes/execnodes.h"
96 : #include "nodes/miscnodes.h"
97 : #include "nodes/nodeFuncs.h"
98 : #include "utils/array.h"
99 : #include "utils/builtins.h"
100 : #include "utils/date.h"
101 : #include "utils/datetime.h"
102 : #include "utils/lsyscache.h"
103 : #include "utils/rel.h"
104 : #include "utils/syscache.h"
105 : #include "utils/xml.h"
106 :
107 :
108 : /* GUC variables */
109 : int xmlbinary = XMLBINARY_BASE64;
110 : int xmloption = XMLOPTION_CONTENT;
111 :
112 : #ifdef USE_LIBXML
113 :
114 : /* random number to identify PgXmlErrorContext */
115 : #define ERRCXT_MAGIC 68275028
116 :
117 : struct PgXmlErrorContext
118 : {
119 : int magic;
120 : /* strictness argument passed to pg_xml_init */
121 : PgXmlStrictness strictness;
122 : /* current error status and accumulated message, if any */
123 : bool err_occurred;
124 : StringInfoData err_buf;
125 : /* previous libxml error handling state (saved by pg_xml_init) */
126 : xmlStructuredErrorFunc saved_errfunc;
127 : void *saved_errcxt;
128 : /* previous libxml entity handler (saved by pg_xml_init) */
129 : xmlExternalEntityLoader saved_entityfunc;
130 : };
131 :
132 : static xmlParserInputPtr xmlPgEntityLoader(const char *URL, const char *ID,
133 : xmlParserCtxtPtr ctxt);
134 : static void xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
135 : int sqlcode, const char *msg);
136 : static void xml_errorHandler(void *data, PgXmlErrorPtr error);
137 : static int errdetail_for_xml_code(int code);
138 : static void chopStringInfoNewlines(StringInfo str);
139 : static void appendStringInfoLineSeparator(StringInfo str);
140 :
141 : #ifdef USE_LIBXMLCONTEXT
142 :
143 : static MemoryContext LibxmlContext = NULL;
144 :
145 : static void xml_memory_init(void);
146 : static void *xml_palloc(size_t size);
147 : static void *xml_repalloc(void *ptr, size_t size);
148 : static void xml_pfree(void *ptr);
149 : static char *xml_pstrdup(const char *string);
150 : #endif /* USE_LIBXMLCONTEXT */
151 :
152 : static xmlChar *xml_text2xmlChar(text *in);
153 : static int parse_xml_decl(const xmlChar *str, size_t *lenp,
154 : xmlChar **version, xmlChar **encoding, int *standalone);
155 : static bool print_xml_decl(StringInfo buf, const xmlChar *version,
156 : pg_enc encoding, int standalone);
157 : static bool xml_doctype_in_content(const xmlChar *str);
158 : static xmlDocPtr xml_parse(text *data, XmlOptionType xmloption_arg,
159 : bool preserve_whitespace, int encoding,
160 : XmlOptionType *parsed_xmloptiontype,
161 : xmlNodePtr *parsed_nodes,
162 : Node *escontext);
163 : static text *xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt);
164 : static int xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
165 : ArrayBuildState *astate,
166 : PgXmlErrorContext *xmlerrcxt);
167 : static xmlChar *pg_xmlCharStrndup(const char *str, size_t len);
168 : #endif /* USE_LIBXML */
169 :
170 : static void xmldata_root_element_start(StringInfo result, const char *eltname,
171 : const char *xmlschema, const char *targetns,
172 : bool top_level);
173 : static void xmldata_root_element_end(StringInfo result, const char *eltname);
174 : static StringInfo query_to_xml_internal(const char *query, char *tablename,
175 : const char *xmlschema, bool nulls, bool tableforest,
176 : const char *targetns, bool top_level);
177 : static const char *map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid,
178 : bool nulls, bool tableforest, const char *targetns);
179 : static const char *map_sql_schema_to_xmlschema_types(Oid nspid,
180 : List *relid_list, bool nulls,
181 : bool tableforest, const char *targetns);
182 : static const char *map_sql_catalog_to_xmlschema_types(List *nspid_list,
183 : bool nulls, bool tableforest,
184 : const char *targetns);
185 : static const char *map_sql_type_to_xml_name(Oid typeoid, int typmod);
186 : static const char *map_sql_typecoll_to_xmlschema_types(List *tupdesc_list);
187 : static const char *map_sql_type_to_xmlschema_type(Oid typeoid, int typmod);
188 : static void SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result,
189 : char *tablename, bool nulls, bool tableforest,
190 : const char *targetns, bool top_level);
191 :
192 : /* XMLTABLE support */
193 : #ifdef USE_LIBXML
194 : /* random number to identify XmlTableContext */
195 : #define XMLTABLE_CONTEXT_MAGIC 46922182
196 : typedef struct XmlTableBuilderData
197 : {
198 : int magic;
199 : int natts;
200 : long int row_count;
201 : PgXmlErrorContext *xmlerrcxt;
202 : xmlParserCtxtPtr ctxt;
203 : xmlDocPtr doc;
204 : xmlXPathContextPtr xpathcxt;
205 : xmlXPathCompExprPtr xpathcomp;
206 : xmlXPathObjectPtr xpathobj;
207 : xmlXPathCompExprPtr *xpathscomp;
208 : } XmlTableBuilderData;
209 : #endif
210 :
211 : static void XmlTableInitOpaque(struct TableFuncScanState *state, int natts);
212 : static void XmlTableSetDocument(struct TableFuncScanState *state, Datum value);
213 : static void XmlTableSetNamespace(struct TableFuncScanState *state, const char *name,
214 : const char *uri);
215 : static void XmlTableSetRowFilter(struct TableFuncScanState *state, const char *path);
216 : static void XmlTableSetColumnFilter(struct TableFuncScanState *state,
217 : const char *path, int colnum);
218 : static bool XmlTableFetchRow(struct TableFuncScanState *state);
219 : static Datum XmlTableGetValue(struct TableFuncScanState *state, int colnum,
220 : Oid typid, int32 typmod, bool *isnull);
221 : static void XmlTableDestroyOpaque(struct TableFuncScanState *state);
222 :
223 : const TableFuncRoutine XmlTableRoutine =
224 : {
225 : .InitOpaque = XmlTableInitOpaque,
226 : .SetDocument = XmlTableSetDocument,
227 : .SetNamespace = XmlTableSetNamespace,
228 : .SetRowFilter = XmlTableSetRowFilter,
229 : .SetColumnFilter = XmlTableSetColumnFilter,
230 : .FetchRow = XmlTableFetchRow,
231 : .GetValue = XmlTableGetValue,
232 : .DestroyOpaque = XmlTableDestroyOpaque
233 : };
234 :
235 : #define NO_XML_SUPPORT() \
236 : ereport(ERROR, \
237 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
238 : errmsg("unsupported XML feature"), \
239 : errdetail("This functionality requires the server to be built with libxml support.")))
240 :
241 :
242 : /* from SQL/XML:2008 section 4.9 */
243 : #define NAMESPACE_XSD "http://www.w3.org/2001/XMLSchema"
244 : #define NAMESPACE_XSI "http://www.w3.org/2001/XMLSchema-instance"
245 : #define NAMESPACE_SQLXML "http://standards.iso.org/iso/9075/2003/sqlxml"
246 :
247 :
248 : #ifdef USE_LIBXML
249 :
250 : static int
251 0 : xmlChar_to_encoding(const xmlChar *encoding_name)
252 : {
253 0 : int encoding = pg_char_to_encoding((const char *) encoding_name);
254 :
255 0 : if (encoding < 0)
256 0 : ereport(ERROR,
257 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
258 : errmsg("invalid encoding name \"%s\"",
259 : (const char *) encoding_name)));
260 0 : return encoding;
261 : }
262 : #endif
263 :
264 :
265 : /*
266 : * xml_in uses a plain C string to VARDATA conversion, so for the time being
267 : * we use the conversion function for the text datatype.
268 : *
269 : * This is only acceptable so long as xmltype and text use the same
270 : * representation.
271 : */
272 : Datum
273 828 : xml_in(PG_FUNCTION_ARGS)
274 : {
275 : #ifdef USE_LIBXML
276 828 : char *s = PG_GETARG_CSTRING(0);
277 : xmltype *vardata;
278 : xmlDocPtr doc;
279 :
280 : /* Build the result object. */
281 828 : vardata = (xmltype *) cstring_to_text(s);
282 :
283 : /*
284 : * Parse the data to check if it is well-formed XML data.
285 : *
286 : * Note: we don't need to worry about whether a soft error is detected.
287 : */
288 828 : doc = xml_parse(vardata, xmloption, true, GetDatabaseEncoding(),
289 828 : NULL, NULL, fcinfo->context);
290 780 : if (doc != NULL)
291 768 : xmlFreeDoc(doc);
292 :
293 780 : PG_RETURN_XML_P(vardata);
294 : #else
295 : NO_XML_SUPPORT();
296 : return 0;
297 : #endif
298 : }
299 :
300 :
301 : #define PG_XML_DEFAULT_VERSION "1.0"
302 :
303 :
304 : /*
305 : * xml_out_internal uses a plain VARDATA to C string conversion, so for the
306 : * time being we use the conversion function for the text datatype.
307 : *
308 : * This is only acceptable so long as xmltype and text use the same
309 : * representation.
310 : */
311 : static char *
312 23066 : xml_out_internal(xmltype *x, pg_enc target_encoding)
313 : {
314 23066 : char *str = text_to_cstring((text *) x);
315 :
316 : #ifdef USE_LIBXML
317 23066 : size_t len = strlen(str);
318 : xmlChar *version;
319 : int standalone;
320 : int res_code;
321 :
322 23066 : if ((res_code = parse_xml_decl((xmlChar *) str,
323 : &len, &version, NULL, &standalone)) == 0)
324 : {
325 : StringInfoData buf;
326 :
327 23066 : initStringInfo(&buf);
328 :
329 23066 : if (!print_xml_decl(&buf, version, target_encoding, standalone))
330 : {
331 : /*
332 : * If we are not going to produce an XML declaration, eat a single
333 : * newline in the original string to prevent empty first lines in
334 : * the output.
335 : */
336 23018 : if (*(str + len) == '\n')
337 6 : len += 1;
338 : }
339 23066 : appendStringInfoString(&buf, str + len);
340 :
341 23066 : pfree(str);
342 :
343 23066 : return buf.data;
344 : }
345 :
346 0 : ereport(WARNING,
347 : errcode(ERRCODE_INTERNAL_ERROR),
348 : errmsg_internal("could not parse XML declaration in stored value"),
349 : errdetail_for_xml_code(res_code));
350 : #endif
351 0 : return str;
352 : }
353 :
354 :
355 : Datum
356 22802 : xml_out(PG_FUNCTION_ARGS)
357 : {
358 22802 : xmltype *x = PG_GETARG_XML_P(0);
359 :
360 : /*
361 : * xml_out removes the encoding property in all cases. This is because we
362 : * cannot control from here whether the datum will be converted to a
363 : * different client encoding, so we'd do more harm than good by including
364 : * it.
365 : */
366 22802 : PG_RETURN_CSTRING(xml_out_internal(x, 0));
367 : }
368 :
369 :
370 : Datum
371 0 : xml_recv(PG_FUNCTION_ARGS)
372 : {
373 : #ifdef USE_LIBXML
374 0 : StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
375 : xmltype *result;
376 : char *str;
377 : char *newstr;
378 : int nbytes;
379 : xmlDocPtr doc;
380 0 : xmlChar *encodingStr = NULL;
381 : int encoding;
382 :
383 : /*
384 : * Read the data in raw format. We don't know yet what the encoding is, as
385 : * that information is embedded in the xml declaration; so we have to
386 : * parse that before converting to server encoding.
387 : */
388 0 : nbytes = buf->len - buf->cursor;
389 0 : str = (char *) pq_getmsgbytes(buf, nbytes);
390 :
391 : /*
392 : * We need a null-terminated string to pass to parse_xml_decl(). Rather
393 : * than make a separate copy, make the temporary result one byte bigger
394 : * than it needs to be.
395 : */
396 0 : result = palloc(nbytes + 1 + VARHDRSZ);
397 0 : SET_VARSIZE(result, nbytes + VARHDRSZ);
398 0 : memcpy(VARDATA(result), str, nbytes);
399 0 : str = VARDATA(result);
400 0 : str[nbytes] = '\0';
401 :
402 0 : parse_xml_decl((const xmlChar *) str, NULL, NULL, &encodingStr, NULL);
403 :
404 : /*
405 : * If encoding wasn't explicitly specified in the XML header, treat it as
406 : * UTF-8, as that's the default in XML. This is different from xml_in(),
407 : * where the input has to go through the normal client to server encoding
408 : * conversion.
409 : */
410 0 : encoding = encodingStr ? xmlChar_to_encoding(encodingStr) : PG_UTF8;
411 :
412 : /*
413 : * Parse the data to check if it is well-formed XML data. Assume that
414 : * xml_parse will throw ERROR if not.
415 : */
416 0 : doc = xml_parse(result, xmloption, true, encoding, NULL, NULL, NULL);
417 0 : xmlFreeDoc(doc);
418 :
419 : /* Now that we know what we're dealing with, convert to server encoding */
420 0 : newstr = pg_any_to_server(str, nbytes, encoding);
421 :
422 0 : if (newstr != str)
423 : {
424 0 : pfree(result);
425 0 : result = (xmltype *) cstring_to_text(newstr);
426 0 : pfree(newstr);
427 : }
428 :
429 0 : PG_RETURN_XML_P(result);
430 : #else
431 : NO_XML_SUPPORT();
432 : return 0;
433 : #endif
434 : }
435 :
436 :
437 : Datum
438 0 : xml_send(PG_FUNCTION_ARGS)
439 : {
440 0 : xmltype *x = PG_GETARG_XML_P(0);
441 : char *outval;
442 : StringInfoData buf;
443 :
444 : /*
445 : * xml_out_internal doesn't convert the encoding, it just prints the right
446 : * declaration. pq_sendtext will do the conversion.
447 : */
448 0 : outval = xml_out_internal(x, pg_get_client_encoding());
449 :
450 0 : pq_begintypsend(&buf);
451 0 : pq_sendtext(&buf, outval, strlen(outval));
452 0 : pfree(outval);
453 0 : PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
454 : }
455 :
456 :
457 : #ifdef USE_LIBXML
458 : static void
459 132 : appendStringInfoText(StringInfo str, const text *t)
460 : {
461 132 : appendBinaryStringInfo(str, VARDATA_ANY(t), VARSIZE_ANY_EXHDR(t));
462 132 : }
463 : #endif
464 :
465 :
466 : static xmltype *
467 22046 : stringinfo_to_xmltype(StringInfo buf)
468 : {
469 22046 : return (xmltype *) cstring_to_text_with_len(buf->data, buf->len);
470 : }
471 :
472 :
473 : static xmltype *
474 78 : cstring_to_xmltype(const char *string)
475 : {
476 78 : return (xmltype *) cstring_to_text(string);
477 : }
478 :
479 :
480 : #ifdef USE_LIBXML
481 : static xmltype *
482 22168 : xmlBuffer_to_xmltype(xmlBufferPtr buf)
483 : {
484 22168 : return (xmltype *) cstring_to_text_with_len((const char *) xmlBufferContent(buf),
485 : xmlBufferLength(buf));
486 : }
487 : #endif
488 :
489 :
490 : Datum
491 42 : xmlcomment(PG_FUNCTION_ARGS)
492 : {
493 : #ifdef USE_LIBXML
494 42 : text *arg = PG_GETARG_TEXT_PP(0);
495 42 : char *argdata = VARDATA_ANY(arg);
496 42 : int len = VARSIZE_ANY_EXHDR(arg);
497 : StringInfoData buf;
498 : int i;
499 :
500 : /* check for "--" in string or "-" at the end */
501 180 : for (i = 1; i < len; i++)
502 : {
503 144 : if (argdata[i] == '-' && argdata[i - 1] == '-')
504 6 : ereport(ERROR,
505 : (errcode(ERRCODE_INVALID_XML_COMMENT),
506 : errmsg("invalid XML comment")));
507 : }
508 36 : if (len > 0 && argdata[len - 1] == '-')
509 6 : ereport(ERROR,
510 : (errcode(ERRCODE_INVALID_XML_COMMENT),
511 : errmsg("invalid XML comment")));
512 :
513 30 : initStringInfo(&buf);
514 30 : appendStringInfoString(&buf, "<!--");
515 30 : appendStringInfoText(&buf, arg);
516 30 : appendStringInfoString(&buf, "-->");
517 :
518 30 : PG_RETURN_XML_P(stringinfo_to_xmltype(&buf));
519 : #else
520 : NO_XML_SUPPORT();
521 : return 0;
522 : #endif
523 : }
524 :
525 :
526 : Datum
527 30 : xmltext(PG_FUNCTION_ARGS)
528 : {
529 : #ifdef USE_LIBXML
530 30 : text *arg = PG_GETARG_TEXT_PP(0);
531 : text *result;
532 30 : xmlChar *xmlbuf = NULL;
533 :
534 30 : xmlbuf = xmlEncodeSpecialChars(NULL, xml_text2xmlChar(arg));
535 :
536 : Assert(xmlbuf);
537 :
538 30 : result = cstring_to_text_with_len((const char *) xmlbuf, xmlStrlen(xmlbuf));
539 30 : xmlFree(xmlbuf);
540 30 : PG_RETURN_XML_P(result);
541 : #else
542 : NO_XML_SUPPORT();
543 : return 0;
544 : #endif /* not USE_LIBXML */
545 : }
546 :
547 :
548 : /*
549 : * TODO: xmlconcat needs to merge the notations and unparsed entities
550 : * of the argument values. Not very important in practice, though.
551 : */
552 : xmltype *
553 21796 : xmlconcat(List *args)
554 : {
555 : #ifdef USE_LIBXML
556 21796 : int global_standalone = 1;
557 21796 : xmlChar *global_version = NULL;
558 21796 : bool global_version_no_value = false;
559 : StringInfoData buf;
560 : ListCell *v;
561 :
562 21796 : initStringInfo(&buf);
563 65394 : foreach(v, args)
564 : {
565 43598 : xmltype *x = DatumGetXmlP(PointerGetDatum(lfirst(v)));
566 : size_t len;
567 : xmlChar *version;
568 : int standalone;
569 : char *str;
570 :
571 43598 : len = VARSIZE(x) - VARHDRSZ;
572 43598 : str = text_to_cstring((text *) x);
573 :
574 43598 : parse_xml_decl((xmlChar *) str, &len, &version, NULL, &standalone);
575 :
576 43598 : if (standalone == 0 && global_standalone == 1)
577 0 : global_standalone = 0;
578 43598 : if (standalone < 0)
579 43586 : global_standalone = -1;
580 :
581 43598 : if (!version)
582 43580 : global_version_no_value = true;
583 18 : else if (!global_version)
584 12 : global_version = version;
585 6 : else if (xmlStrcmp(version, global_version) != 0)
586 0 : global_version_no_value = true;
587 :
588 43598 : appendStringInfoString(&buf, str + len);
589 43598 : pfree(str);
590 : }
591 :
592 21796 : if (!global_version_no_value || global_standalone >= 0)
593 : {
594 : StringInfoData buf2;
595 :
596 6 : initStringInfo(&buf2);
597 :
598 6 : print_xml_decl(&buf2,
599 6 : (!global_version_no_value) ? global_version : NULL,
600 : 0,
601 : global_standalone);
602 :
603 6 : appendBinaryStringInfo(&buf2, buf.data, buf.len);
604 6 : buf = buf2;
605 : }
606 :
607 21796 : return stringinfo_to_xmltype(&buf);
608 : #else
609 : NO_XML_SUPPORT();
610 : return NULL;
611 : #endif
612 : }
613 :
614 :
615 : /*
616 : * XMLAGG support
617 : */
618 : Datum
619 21772 : xmlconcat2(PG_FUNCTION_ARGS)
620 : {
621 21772 : if (PG_ARGISNULL(0))
622 : {
623 18 : if (PG_ARGISNULL(1))
624 0 : PG_RETURN_NULL();
625 : else
626 18 : PG_RETURN_XML_P(PG_GETARG_XML_P(1));
627 : }
628 21754 : else if (PG_ARGISNULL(1))
629 0 : PG_RETURN_XML_P(PG_GETARG_XML_P(0));
630 : else
631 21754 : PG_RETURN_XML_P(xmlconcat(list_make2(PG_GETARG_XML_P(0),
632 : PG_GETARG_XML_P(1))));
633 : }
634 :
635 :
636 : Datum
637 6 : texttoxml(PG_FUNCTION_ARGS)
638 : {
639 6 : text *data = PG_GETARG_TEXT_PP(0);
640 :
641 6 : PG_RETURN_XML_P(xmlparse(data, xmloption, true));
642 : }
643 :
644 :
645 : Datum
646 0 : xmltotext(PG_FUNCTION_ARGS)
647 : {
648 0 : xmltype *data = PG_GETARG_XML_P(0);
649 :
650 : /* It's actually binary compatible. */
651 0 : PG_RETURN_TEXT_P((text *) data);
652 : }
653 :
654 :
655 : text *
656 168 : xmltotext_with_options(xmltype *data, XmlOptionType xmloption_arg, bool indent)
657 : {
658 : #ifdef USE_LIBXML
659 : text *volatile result;
660 : xmlDocPtr doc;
661 : XmlOptionType parsed_xmloptiontype;
662 : xmlNodePtr content_nodes;
663 168 : volatile xmlBufferPtr buf = NULL;
664 168 : volatile xmlSaveCtxtPtr ctxt = NULL;
665 168 : ErrorSaveContext escontext = {T_ErrorSaveContext};
666 : PgXmlErrorContext *xmlerrcxt;
667 : #endif
668 :
669 168 : if (xmloption_arg != XMLOPTION_DOCUMENT && !indent)
670 : {
671 : /*
672 : * We don't actually need to do anything, so just return the
673 : * binary-compatible input. For backwards-compatibility reasons,
674 : * allow such cases to succeed even without USE_LIBXML.
675 : */
676 36 : return (text *) data;
677 : }
678 :
679 : #ifdef USE_LIBXML
680 : /* Parse the input according to the xmloption */
681 132 : doc = xml_parse(data, xmloption_arg, true, GetDatabaseEncoding(),
682 : &parsed_xmloptiontype, &content_nodes,
683 : (Node *) &escontext);
684 132 : if (doc == NULL || escontext.error_occurred)
685 : {
686 30 : if (doc)
687 0 : xmlFreeDoc(doc);
688 : /* A soft error must be failure to conform to XMLOPTION_DOCUMENT */
689 30 : ereport(ERROR,
690 : (errcode(ERRCODE_NOT_AN_XML_DOCUMENT),
691 : errmsg("not an XML document")));
692 : }
693 :
694 : /* If we weren't asked to indent, we're done. */
695 102 : if (!indent)
696 : {
697 18 : xmlFreeDoc(doc);
698 18 : return (text *) data;
699 : }
700 :
701 : /* Otherwise, we gotta spin up some error handling. */
702 84 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
703 :
704 84 : PG_TRY();
705 : {
706 84 : size_t decl_len = 0;
707 :
708 : /* The serialized data will go into this buffer. */
709 84 : buf = xmlBufferCreate();
710 :
711 84 : if (buf == NULL || xmlerrcxt->err_occurred)
712 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
713 : "could not allocate xmlBuffer");
714 :
715 : /* Detect whether there's an XML declaration */
716 84 : parse_xml_decl(xml_text2xmlChar(data), &decl_len, NULL, NULL, NULL);
717 :
718 : /*
719 : * Emit declaration only if the input had one. Note: some versions of
720 : * xmlSaveToBuffer leak memory if a non-null encoding argument is
721 : * passed, so don't do that. We don't want any encoding conversion
722 : * anyway.
723 : */
724 84 : if (decl_len == 0)
725 72 : ctxt = xmlSaveToBuffer(buf, NULL,
726 : XML_SAVE_NO_DECL | XML_SAVE_FORMAT);
727 : else
728 12 : ctxt = xmlSaveToBuffer(buf, NULL,
729 : XML_SAVE_FORMAT);
730 :
731 84 : if (ctxt == NULL || xmlerrcxt->err_occurred)
732 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
733 : "could not allocate xmlSaveCtxt");
734 :
735 84 : if (parsed_xmloptiontype == XMLOPTION_DOCUMENT)
736 : {
737 : /* If it's a document, saving is easy. */
738 36 : if (xmlSaveDoc(ctxt, doc) == -1 || xmlerrcxt->err_occurred)
739 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
740 : "could not save document to xmlBuffer");
741 : }
742 48 : else if (content_nodes != NULL)
743 : {
744 : /*
745 : * Deal with the case where we have non-singly-rooted XML.
746 : * libxml's dump functions don't work well for that without help.
747 : * We build a fake root node that serves as a container for the
748 : * content nodes, and then iterate over the nodes.
749 : */
750 : xmlNodePtr root;
751 : xmlNodePtr newline;
752 :
753 42 : root = xmlNewNode(NULL, (const xmlChar *) "content-root");
754 42 : if (root == NULL || xmlerrcxt->err_occurred)
755 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
756 : "could not allocate xml node");
757 :
758 : /* This attaches root to doc, so we need not free it separately. */
759 42 : xmlDocSetRootElement(doc, root);
760 42 : xmlAddChild(root, content_nodes);
761 :
762 : /*
763 : * We use this node to insert newlines in the dump. Note: in at
764 : * least some libxml versions, xmlNewDocText would not attach the
765 : * node to the document even if we passed it. Therefore, manage
766 : * freeing of this node manually, and pass NULL here to make sure
767 : * there's not a dangling link.
768 : */
769 42 : newline = xmlNewDocText(NULL, (const xmlChar *) "\n");
770 42 : if (newline == NULL || xmlerrcxt->err_occurred)
771 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
772 : "could not allocate xml node");
773 :
774 108 : for (xmlNodePtr node = root->children; node; node = node->next)
775 : {
776 : /* insert newlines between nodes */
777 66 : if (node->type != XML_TEXT_NODE && node->prev != NULL)
778 : {
779 18 : if (xmlSaveTree(ctxt, newline) == -1 || xmlerrcxt->err_occurred)
780 : {
781 0 : xmlFreeNode(newline);
782 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
783 : "could not save newline to xmlBuffer");
784 : }
785 : }
786 :
787 66 : if (xmlSaveTree(ctxt, node) == -1 || xmlerrcxt->err_occurred)
788 : {
789 0 : xmlFreeNode(newline);
790 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
791 : "could not save content to xmlBuffer");
792 : }
793 : }
794 :
795 42 : xmlFreeNode(newline);
796 : }
797 :
798 84 : if (xmlSaveClose(ctxt) == -1 || xmlerrcxt->err_occurred)
799 : {
800 0 : ctxt = NULL; /* don't try to close it again */
801 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
802 : "could not close xmlSaveCtxtPtr");
803 : }
804 :
805 84 : result = (text *) xmlBuffer_to_xmltype(buf);
806 : }
807 0 : PG_CATCH();
808 : {
809 0 : if (ctxt)
810 0 : xmlSaveClose(ctxt);
811 0 : if (buf)
812 0 : xmlBufferFree(buf);
813 0 : if (doc)
814 0 : xmlFreeDoc(doc);
815 :
816 0 : pg_xml_done(xmlerrcxt, true);
817 :
818 0 : PG_RE_THROW();
819 : }
820 84 : PG_END_TRY();
821 :
822 84 : xmlBufferFree(buf);
823 84 : xmlFreeDoc(doc);
824 :
825 84 : pg_xml_done(xmlerrcxt, false);
826 :
827 84 : return result;
828 : #else
829 : NO_XML_SUPPORT();
830 : return NULL;
831 : #endif
832 : }
833 :
834 :
835 : xmltype *
836 21928 : xmlelement(XmlExpr *xexpr,
837 : Datum *named_argvalue, bool *named_argnull,
838 : Datum *argvalue, bool *argnull)
839 : {
840 : #ifdef USE_LIBXML
841 : xmltype *result;
842 : List *named_arg_strings;
843 : List *arg_strings;
844 : int i;
845 : ListCell *arg;
846 : ListCell *narg;
847 : PgXmlErrorContext *xmlerrcxt;
848 21928 : volatile xmlBufferPtr buf = NULL;
849 21928 : volatile xmlTextWriterPtr writer = NULL;
850 :
851 : /*
852 : * All arguments are already evaluated, and their values are passed in the
853 : * named_argvalue/named_argnull or argvalue/argnull arrays. This avoids
854 : * issues if one of the arguments involves a call to some other function
855 : * or subsystem that wants to use libxml on its own terms. We examine the
856 : * original XmlExpr to identify the numbers and types of the arguments.
857 : */
858 21928 : named_arg_strings = NIL;
859 21928 : i = 0;
860 21976 : foreach(arg, xexpr->named_args)
861 : {
862 54 : Expr *e = (Expr *) lfirst(arg);
863 : char *str;
864 :
865 54 : if (named_argnull[i])
866 0 : str = NULL;
867 : else
868 54 : str = map_sql_value_to_xml_value(named_argvalue[i],
869 : exprType((Node *) e),
870 : false);
871 48 : named_arg_strings = lappend(named_arg_strings, str);
872 48 : i++;
873 : }
874 :
875 21922 : arg_strings = NIL;
876 21922 : i = 0;
877 43820 : foreach(arg, xexpr->args)
878 : {
879 21898 : Expr *e = (Expr *) lfirst(arg);
880 : char *str;
881 :
882 : /* here we can just forget NULL elements immediately */
883 21898 : if (!argnull[i])
884 : {
885 21898 : str = map_sql_value_to_xml_value(argvalue[i],
886 : exprType((Node *) e),
887 : true);
888 21898 : arg_strings = lappend(arg_strings, str);
889 : }
890 21898 : i++;
891 : }
892 :
893 21922 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
894 :
895 21922 : PG_TRY();
896 : {
897 21922 : buf = xmlBufferCreate();
898 21922 : if (buf == NULL || xmlerrcxt->err_occurred)
899 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
900 : "could not allocate xmlBuffer");
901 21922 : writer = xmlNewTextWriterMemory(buf, 0);
902 21922 : if (writer == NULL || xmlerrcxt->err_occurred)
903 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
904 : "could not allocate xmlTextWriter");
905 :
906 21922 : xmlTextWriterStartElement(writer, (xmlChar *) xexpr->name);
907 :
908 21970 : forboth(arg, named_arg_strings, narg, xexpr->arg_names)
909 : {
910 48 : char *str = (char *) lfirst(arg);
911 48 : char *argname = strVal(lfirst(narg));
912 :
913 48 : if (str)
914 48 : xmlTextWriterWriteAttribute(writer,
915 : (xmlChar *) argname,
916 : (xmlChar *) str);
917 : }
918 :
919 43820 : foreach(arg, arg_strings)
920 : {
921 21898 : char *str = (char *) lfirst(arg);
922 :
923 21898 : xmlTextWriterWriteRaw(writer, (xmlChar *) str);
924 : }
925 :
926 21922 : xmlTextWriterEndElement(writer);
927 :
928 : /* we MUST do this now to flush data out to the buffer ... */
929 21922 : xmlFreeTextWriter(writer);
930 21922 : writer = NULL;
931 :
932 21922 : result = xmlBuffer_to_xmltype(buf);
933 : }
934 0 : PG_CATCH();
935 : {
936 0 : if (writer)
937 0 : xmlFreeTextWriter(writer);
938 0 : if (buf)
939 0 : xmlBufferFree(buf);
940 :
941 0 : pg_xml_done(xmlerrcxt, true);
942 :
943 0 : PG_RE_THROW();
944 : }
945 21922 : PG_END_TRY();
946 :
947 21922 : xmlBufferFree(buf);
948 :
949 21922 : pg_xml_done(xmlerrcxt, false);
950 :
951 21922 : return result;
952 : #else
953 : NO_XML_SUPPORT();
954 : return NULL;
955 : #endif
956 : }
957 :
958 :
959 : xmltype *
960 138 : xmlparse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace)
961 : {
962 : #ifdef USE_LIBXML
963 : xmlDocPtr doc;
964 :
965 138 : doc = xml_parse(data, xmloption_arg, preserve_whitespace,
966 : GetDatabaseEncoding(), NULL, NULL, NULL);
967 90 : xmlFreeDoc(doc);
968 :
969 90 : return (xmltype *) data;
970 : #else
971 : NO_XML_SUPPORT();
972 : return NULL;
973 : #endif
974 : }
975 :
976 :
977 : xmltype *
978 72 : xmlpi(const char *target, text *arg, bool arg_is_null, bool *result_is_null)
979 : {
980 : #ifdef USE_LIBXML
981 : xmltype *result;
982 : StringInfoData buf;
983 :
984 72 : if (pg_strcasecmp(target, "xml") == 0)
985 12 : ereport(ERROR,
986 : (errcode(ERRCODE_SYNTAX_ERROR), /* really */
987 : errmsg("invalid XML processing instruction"),
988 : errdetail("XML processing instruction target name cannot be \"%s\".", target)));
989 :
990 : /*
991 : * Following the SQL standard, the null check comes after the syntax check
992 : * above.
993 : */
994 60 : *result_is_null = arg_is_null;
995 60 : if (*result_is_null)
996 12 : return NULL;
997 :
998 48 : initStringInfo(&buf);
999 :
1000 48 : appendStringInfo(&buf, "<?%s", target);
1001 :
1002 48 : if (arg != NULL)
1003 : {
1004 : char *string;
1005 :
1006 24 : string = text_to_cstring(arg);
1007 24 : if (strstr(string, "?>") != NULL)
1008 6 : ereport(ERROR,
1009 : (errcode(ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION),
1010 : errmsg("invalid XML processing instruction"),
1011 : errdetail("XML processing instruction cannot contain \"?>\".")));
1012 :
1013 18 : appendStringInfoChar(&buf, ' ');
1014 18 : appendStringInfoString(&buf, string + strspn(string, " "));
1015 18 : pfree(string);
1016 : }
1017 42 : appendStringInfoString(&buf, "?>");
1018 :
1019 42 : result = stringinfo_to_xmltype(&buf);
1020 42 : pfree(buf.data);
1021 42 : return result;
1022 : #else
1023 : NO_XML_SUPPORT();
1024 : return NULL;
1025 : #endif
1026 : }
1027 :
1028 :
1029 : xmltype *
1030 60 : xmlroot(xmltype *data, text *version, int standalone)
1031 : {
1032 : #ifdef USE_LIBXML
1033 : char *str;
1034 : size_t len;
1035 : xmlChar *orig_version;
1036 : int orig_standalone;
1037 : StringInfoData buf;
1038 :
1039 60 : len = VARSIZE(data) - VARHDRSZ;
1040 60 : str = text_to_cstring((text *) data);
1041 :
1042 60 : parse_xml_decl((xmlChar *) str, &len, &orig_version, NULL, &orig_standalone);
1043 :
1044 60 : if (version)
1045 24 : orig_version = xml_text2xmlChar(version);
1046 : else
1047 36 : orig_version = NULL;
1048 :
1049 60 : switch (standalone)
1050 : {
1051 18 : case XML_STANDALONE_YES:
1052 18 : orig_standalone = 1;
1053 18 : break;
1054 12 : case XML_STANDALONE_NO:
1055 12 : orig_standalone = 0;
1056 12 : break;
1057 12 : case XML_STANDALONE_NO_VALUE:
1058 12 : orig_standalone = -1;
1059 12 : break;
1060 18 : case XML_STANDALONE_OMITTED:
1061 : /* leave original value */
1062 18 : break;
1063 : }
1064 :
1065 60 : initStringInfo(&buf);
1066 60 : print_xml_decl(&buf, orig_version, 0, orig_standalone);
1067 60 : appendStringInfoString(&buf, str + len);
1068 :
1069 60 : return stringinfo_to_xmltype(&buf);
1070 : #else
1071 : NO_XML_SUPPORT();
1072 : return NULL;
1073 : #endif
1074 : }
1075 :
1076 :
1077 : /*
1078 : * Validate document (given as string) against DTD (given as external link)
1079 : *
1080 : * This has been removed because it is a security hole: unprivileged users
1081 : * should not be able to use Postgres to fetch arbitrary external files,
1082 : * which unfortunately is exactly what libxml is willing to do with the DTD
1083 : * parameter.
1084 : */
1085 : Datum
1086 0 : xmlvalidate(PG_FUNCTION_ARGS)
1087 : {
1088 0 : ereport(ERROR,
1089 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1090 : errmsg("xmlvalidate is not implemented")));
1091 : return 0;
1092 : }
1093 :
1094 :
1095 : bool
1096 24 : xml_is_document(xmltype *arg)
1097 : {
1098 : #ifdef USE_LIBXML
1099 : xmlDocPtr doc;
1100 24 : ErrorSaveContext escontext = {T_ErrorSaveContext};
1101 :
1102 : /*
1103 : * We'll report "true" if no soft error is reported by xml_parse().
1104 : */
1105 24 : doc = xml_parse((text *) arg, XMLOPTION_DOCUMENT, true,
1106 : GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
1107 24 : if (doc)
1108 12 : xmlFreeDoc(doc);
1109 :
1110 24 : return !escontext.error_occurred;
1111 : #else /* not USE_LIBXML */
1112 : NO_XML_SUPPORT();
1113 : return false;
1114 : #endif /* not USE_LIBXML */
1115 : }
1116 :
1117 :
1118 : #ifdef USE_LIBXML
1119 :
1120 : /*
1121 : * pg_xml_init_library --- set up for use of libxml
1122 : *
1123 : * This should be called by each function that is about to use libxml
1124 : * facilities but doesn't require error handling. It initializes libxml
1125 : * and verifies compatibility with the loaded libxml version. These are
1126 : * once-per-session activities.
1127 : *
1128 : * TODO: xmlChar is utf8-char, make proper tuning (initdb with enc!=utf8 and
1129 : * check)
1130 : */
1131 : void
1132 92414 : pg_xml_init_library(void)
1133 : {
1134 : static bool first_time = true;
1135 :
1136 92414 : if (first_time)
1137 : {
1138 : /* Stuff we need do only once per session */
1139 :
1140 : /*
1141 : * Currently, we have no pure UTF-8 support for internals -- check if
1142 : * we can work.
1143 : */
1144 : if (sizeof(char) != sizeof(xmlChar))
1145 : ereport(ERROR,
1146 : (errmsg("could not initialize XML library"),
1147 : errdetail("libxml2 has incompatible char type: sizeof(char)=%zu, sizeof(xmlChar)=%zu.",
1148 : sizeof(char), sizeof(xmlChar))));
1149 :
1150 : #ifdef USE_LIBXMLCONTEXT
1151 : /* Set up libxml's memory allocation our way */
1152 : xml_memory_init();
1153 : #endif
1154 :
1155 : /* Check library compatibility */
1156 26 : LIBXML_TEST_VERSION;
1157 :
1158 26 : first_time = false;
1159 : }
1160 92414 : }
1161 :
1162 : /*
1163 : * pg_xml_init --- set up for use of libxml and register an error handler
1164 : *
1165 : * This should be called by each function that is about to use libxml
1166 : * facilities and requires error handling. It initializes libxml with
1167 : * pg_xml_init_library() and establishes our libxml error handler.
1168 : *
1169 : * strictness determines which errors are reported and which are ignored.
1170 : *
1171 : * Calls to this function MUST be followed by a PG_TRY block that guarantees
1172 : * that pg_xml_done() is called during either normal or error exit.
1173 : *
1174 : * This is exported for use by contrib/xml2, as well as other code that might
1175 : * wish to share use of this module's libxml error handler.
1176 : */
1177 : PgXmlErrorContext *
1178 24106 : pg_xml_init(PgXmlStrictness strictness)
1179 : {
1180 : PgXmlErrorContext *errcxt;
1181 : void *new_errcxt;
1182 :
1183 : /* Do one-time setup if needed */
1184 24106 : pg_xml_init_library();
1185 :
1186 : /* Create error handling context structure */
1187 24106 : errcxt = (PgXmlErrorContext *) palloc(sizeof(PgXmlErrorContext));
1188 24106 : errcxt->magic = ERRCXT_MAGIC;
1189 24106 : errcxt->strictness = strictness;
1190 24106 : errcxt->err_occurred = false;
1191 24106 : initStringInfo(&errcxt->err_buf);
1192 :
1193 : /*
1194 : * Save original error handler and install ours. libxml originally didn't
1195 : * distinguish between the contexts for generic and for structured error
1196 : * handlers. If we're using an old libxml version, we must thus save the
1197 : * generic error context, even though we're using a structured error
1198 : * handler.
1199 : */
1200 24106 : errcxt->saved_errfunc = xmlStructuredError;
1201 :
1202 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1203 24106 : errcxt->saved_errcxt = xmlStructuredErrorContext;
1204 : #else
1205 : errcxt->saved_errcxt = xmlGenericErrorContext;
1206 : #endif
1207 :
1208 24106 : xmlSetStructuredErrorFunc((void *) errcxt, xml_errorHandler);
1209 :
1210 : /*
1211 : * Verify that xmlSetStructuredErrorFunc set the context variable we
1212 : * expected it to. If not, the error context pointer we just saved is not
1213 : * the correct thing to restore, and since that leaves us without a way to
1214 : * restore the context in pg_xml_done, we must fail.
1215 : *
1216 : * The only known situation in which this test fails is if we compile with
1217 : * headers from a libxml2 that doesn't track the structured error context
1218 : * separately (< 2.7.4), but at runtime use a version that does, or vice
1219 : * versa. The libxml2 authors did not treat that change as constituting
1220 : * an ABI break, so the LIBXML_TEST_VERSION test in pg_xml_init_library
1221 : * fails to protect us from this.
1222 : */
1223 :
1224 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1225 24106 : new_errcxt = xmlStructuredErrorContext;
1226 : #else
1227 : new_errcxt = xmlGenericErrorContext;
1228 : #endif
1229 :
1230 24106 : if (new_errcxt != (void *) errcxt)
1231 0 : ereport(ERROR,
1232 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1233 : errmsg("could not set up XML error handler"),
1234 : errhint("This probably indicates that the version of libxml2"
1235 : " being used is not compatible with the libxml2"
1236 : " header files that PostgreSQL was built with.")));
1237 :
1238 : /*
1239 : * Also, install an entity loader to prevent unwanted fetches of external
1240 : * files and URLs.
1241 : */
1242 24106 : errcxt->saved_entityfunc = xmlGetExternalEntityLoader();
1243 24106 : xmlSetExternalEntityLoader(xmlPgEntityLoader);
1244 :
1245 24106 : return errcxt;
1246 : }
1247 :
1248 :
1249 : /*
1250 : * pg_xml_done --- restore previous libxml error handling
1251 : *
1252 : * Resets libxml's global error-handling state to what it was before
1253 : * pg_xml_init() was called.
1254 : *
1255 : * This routine verifies that all pending errors have been dealt with
1256 : * (in assert-enabled builds, anyway).
1257 : */
1258 : void
1259 24106 : pg_xml_done(PgXmlErrorContext *errcxt, bool isError)
1260 : {
1261 : void *cur_errcxt;
1262 :
1263 : /* An assert seems like enough protection here */
1264 : Assert(errcxt->magic == ERRCXT_MAGIC);
1265 :
1266 : /*
1267 : * In a normal exit, there should be no un-handled libxml errors. But we
1268 : * shouldn't try to enforce this during error recovery, since the longjmp
1269 : * could have been thrown before xml_ereport had a chance to run.
1270 : */
1271 : Assert(!errcxt->err_occurred || isError);
1272 :
1273 : /*
1274 : * Check that libxml's global state is correct, warn if not. This is a
1275 : * real test and not an Assert because it has a higher probability of
1276 : * happening.
1277 : */
1278 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1279 24106 : cur_errcxt = xmlStructuredErrorContext;
1280 : #else
1281 : cur_errcxt = xmlGenericErrorContext;
1282 : #endif
1283 :
1284 24106 : if (cur_errcxt != (void *) errcxt)
1285 0 : elog(WARNING, "libxml error handling state is out of sync with xml.c");
1286 :
1287 : /* Restore the saved handlers */
1288 24106 : xmlSetStructuredErrorFunc(errcxt->saved_errcxt, errcxt->saved_errfunc);
1289 24106 : xmlSetExternalEntityLoader(errcxt->saved_entityfunc);
1290 :
1291 : /*
1292 : * Mark the struct as invalid, just in case somebody somehow manages to
1293 : * call xml_errorHandler or xml_ereport with it.
1294 : */
1295 24106 : errcxt->magic = 0;
1296 :
1297 : /* Release memory */
1298 24106 : pfree(errcxt->err_buf.data);
1299 24106 : pfree(errcxt);
1300 24106 : }
1301 :
1302 :
1303 : /*
1304 : * pg_xml_error_occurred() --- test the error flag
1305 : */
1306 : bool
1307 0 : pg_xml_error_occurred(PgXmlErrorContext *errcxt)
1308 : {
1309 0 : return errcxt->err_occurred;
1310 : }
1311 :
1312 :
1313 : /*
1314 : * SQL/XML allows storing "XML documents" or "XML content". "XML
1315 : * documents" are specified by the XML specification and are parsed
1316 : * easily by libxml. "XML content" is specified by SQL/XML as the
1317 : * production "XMLDecl? content". But libxml can only parse the
1318 : * "content" part, so we have to parse the XML declaration ourselves
1319 : * to complete this.
1320 : */
1321 :
1322 : #define CHECK_XML_SPACE(p) \
1323 : do { \
1324 : if (!xmlIsBlank_ch(*(p))) \
1325 : return XML_ERR_SPACE_REQUIRED; \
1326 : } while (0)
1327 :
1328 : #define SKIP_XML_SPACE(p) \
1329 : while (xmlIsBlank_ch(*(p))) (p)++
1330 :
1331 : /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
1332 : /* Beware of multiple evaluations of argument! */
1333 : #define PG_XMLISNAMECHAR(c) \
1334 : (xmlIsBaseChar_ch(c) || xmlIsIdeographicQ(c) \
1335 : || xmlIsDigit_ch(c) \
1336 : || c == '.' || c == '-' || c == '_' || c == ':' \
1337 : || xmlIsCombiningQ(c) \
1338 : || xmlIsExtender_ch(c))
1339 :
1340 : /* pnstrdup, but deal with xmlChar not char; len is measured in xmlChars */
1341 : static xmlChar *
1342 192 : xml_pnstrdup(const xmlChar *str, size_t len)
1343 : {
1344 : xmlChar *result;
1345 :
1346 192 : result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
1347 192 : memcpy(result, str, len * sizeof(xmlChar));
1348 192 : result[len] = 0;
1349 192 : return result;
1350 : }
1351 :
1352 : /* Ditto, except input is char* */
1353 : static xmlChar *
1354 2424 : pg_xmlCharStrndup(const char *str, size_t len)
1355 : {
1356 : xmlChar *result;
1357 :
1358 2424 : result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
1359 2424 : memcpy(result, str, len);
1360 2424 : result[len] = '\0';
1361 :
1362 2424 : return result;
1363 : }
1364 :
1365 : /*
1366 : * Copy xmlChar string to PostgreSQL-owned memory, freeing the input.
1367 : *
1368 : * The input xmlChar is freed regardless of success of the copy.
1369 : */
1370 : static char *
1371 110010 : xml_pstrdup_and_free(xmlChar *str)
1372 : {
1373 : char *result;
1374 :
1375 110010 : if (str)
1376 : {
1377 110010 : PG_TRY();
1378 : {
1379 110010 : result = pstrdup((char *) str);
1380 : }
1381 0 : PG_FINALLY();
1382 : {
1383 110010 : xmlFree(str);
1384 : }
1385 110010 : PG_END_TRY();
1386 : }
1387 : else
1388 0 : result = NULL;
1389 :
1390 110010 : return result;
1391 : }
1392 :
1393 : /*
1394 : * str is the null-terminated input string. Remaining arguments are
1395 : * output arguments; each can be NULL if value is not wanted.
1396 : * version and encoding are returned as locally-palloc'd strings.
1397 : * Result is 0 if OK, an error code if not.
1398 : */
1399 : static int
1400 68308 : parse_xml_decl(const xmlChar *str, size_t *lenp,
1401 : xmlChar **version, xmlChar **encoding, int *standalone)
1402 : {
1403 : const xmlChar *p;
1404 : const xmlChar *save_p;
1405 : size_t len;
1406 : int utf8char;
1407 : int utf8len;
1408 :
1409 : /*
1410 : * Only initialize libxml. We don't need error handling here, but we do
1411 : * need to make sure libxml is initialized before calling any of its
1412 : * functions. Note that this is safe (and a no-op) if caller has already
1413 : * done pg_xml_init().
1414 : */
1415 68308 : pg_xml_init_library();
1416 :
1417 : /* Initialize output arguments to "not present" */
1418 68308 : if (version)
1419 67672 : *version = NULL;
1420 68308 : if (encoding)
1421 0 : *encoding = NULL;
1422 68308 : if (standalone)
1423 67672 : *standalone = -1;
1424 :
1425 68308 : p = str;
1426 :
1427 68308 : if (xmlStrncmp(p, (xmlChar *) "<?xml", 5) != 0)
1428 68086 : goto finished;
1429 :
1430 : /*
1431 : * If next char is a name char, it's a PI like <?xml-stylesheet ...?>
1432 : * rather than an XMLDecl, so we have done what we came to do and found no
1433 : * XMLDecl.
1434 : *
1435 : * We need an input length value for xmlGetUTF8Char, but there's no need
1436 : * to count the whole document size, so use strnlen not strlen.
1437 : */
1438 222 : utf8len = strnlen((const char *) (p + 5), MAX_MULTIBYTE_CHAR_LEN);
1439 222 : utf8char = xmlGetUTF8Char(p + 5, &utf8len);
1440 222 : if (PG_XMLISNAMECHAR(utf8char))
1441 12 : goto finished;
1442 :
1443 210 : p += 5;
1444 :
1445 : /* version */
1446 210 : CHECK_XML_SPACE(p);
1447 420 : SKIP_XML_SPACE(p);
1448 210 : if (xmlStrncmp(p, (xmlChar *) "version", 7) != 0)
1449 0 : return XML_ERR_VERSION_MISSING;
1450 210 : p += 7;
1451 210 : SKIP_XML_SPACE(p);
1452 210 : if (*p != '=')
1453 0 : return XML_ERR_VERSION_MISSING;
1454 210 : p += 1;
1455 210 : SKIP_XML_SPACE(p);
1456 :
1457 210 : if (*p == '\'' || *p == '"')
1458 210 : {
1459 : const xmlChar *q;
1460 :
1461 210 : q = xmlStrchr(p + 1, *p);
1462 210 : if (!q)
1463 0 : return XML_ERR_VERSION_MISSING;
1464 :
1465 210 : if (version)
1466 192 : *version = xml_pnstrdup(p + 1, q - p - 1);
1467 210 : p = q + 1;
1468 : }
1469 : else
1470 0 : return XML_ERR_VERSION_MISSING;
1471 :
1472 : /* encoding */
1473 210 : save_p = p;
1474 372 : SKIP_XML_SPACE(p);
1475 210 : if (xmlStrncmp(p, (xmlChar *) "encoding", 8) == 0)
1476 : {
1477 54 : CHECK_XML_SPACE(save_p);
1478 54 : p += 8;
1479 54 : SKIP_XML_SPACE(p);
1480 54 : if (*p != '=')
1481 0 : return XML_ERR_MISSING_ENCODING;
1482 54 : p += 1;
1483 54 : SKIP_XML_SPACE(p);
1484 :
1485 54 : if (*p == '\'' || *p == '"')
1486 54 : {
1487 : const xmlChar *q;
1488 :
1489 54 : q = xmlStrchr(p + 1, *p);
1490 54 : if (!q)
1491 0 : return XML_ERR_MISSING_ENCODING;
1492 :
1493 54 : if (encoding)
1494 0 : *encoding = xml_pnstrdup(p + 1, q - p - 1);
1495 54 : p = q + 1;
1496 : }
1497 : else
1498 0 : return XML_ERR_MISSING_ENCODING;
1499 : }
1500 : else
1501 : {
1502 156 : p = save_p;
1503 : }
1504 :
1505 : /* standalone */
1506 210 : save_p = p;
1507 318 : SKIP_XML_SPACE(p);
1508 210 : if (xmlStrncmp(p, (xmlChar *) "standalone", 10) == 0)
1509 : {
1510 108 : CHECK_XML_SPACE(save_p);
1511 108 : p += 10;
1512 108 : SKIP_XML_SPACE(p);
1513 108 : if (*p != '=')
1514 0 : return XML_ERR_STANDALONE_VALUE;
1515 108 : p += 1;
1516 108 : SKIP_XML_SPACE(p);
1517 216 : if (xmlStrncmp(p, (xmlChar *) "'yes'", 5) == 0 ||
1518 108 : xmlStrncmp(p, (xmlChar *) "\"yes\"", 5) == 0)
1519 : {
1520 60 : if (standalone)
1521 60 : *standalone = 1;
1522 60 : p += 5;
1523 : }
1524 96 : else if (xmlStrncmp(p, (xmlChar *) "'no'", 4) == 0 ||
1525 48 : xmlStrncmp(p, (xmlChar *) "\"no\"", 4) == 0)
1526 : {
1527 36 : if (standalone)
1528 36 : *standalone = 0;
1529 36 : p += 4;
1530 : }
1531 : else
1532 12 : return XML_ERR_STANDALONE_VALUE;
1533 : }
1534 : else
1535 : {
1536 102 : p = save_p;
1537 : }
1538 :
1539 198 : SKIP_XML_SPACE(p);
1540 198 : if (xmlStrncmp(p, (xmlChar *) "?>", 2) != 0)
1541 0 : return XML_ERR_XMLDECL_NOT_FINISHED;
1542 198 : p += 2;
1543 :
1544 68296 : finished:
1545 68296 : len = p - str;
1546 :
1547 75028 : for (p = str; p < str + len; p++)
1548 6732 : if (*p > 127)
1549 0 : return XML_ERR_INVALID_CHAR;
1550 :
1551 68296 : if (lenp)
1552 68296 : *lenp = len;
1553 :
1554 68296 : return XML_ERR_OK;
1555 : }
1556 :
1557 :
1558 : /*
1559 : * Write an XML declaration. On output, we adjust the XML declaration
1560 : * as follows. (These rules are the moral equivalent of the clause
1561 : * "Serialization of an XML value" in the SQL standard.)
1562 : *
1563 : * We try to avoid generating an XML declaration if possible. This is
1564 : * so that you don't get trivial things like xml '<foo/>' resulting in
1565 : * '<?xml version="1.0"?><foo/>', which would surely be annoying. We
1566 : * must provide a declaration if the standalone property is specified
1567 : * or if we include an encoding declaration. If we have a
1568 : * declaration, we must specify a version (XML requires this).
1569 : * Otherwise we only make a declaration if the version is not "1.0",
1570 : * which is the default version specified in SQL:2003.
1571 : */
1572 : static bool
1573 23132 : print_xml_decl(StringInfo buf, const xmlChar *version,
1574 : pg_enc encoding, int standalone)
1575 : {
1576 23132 : if ((version && strcmp((const char *) version, PG_XML_DEFAULT_VERSION) != 0)
1577 23096 : || (encoding && encoding != PG_UTF8)
1578 23096 : || standalone != -1)
1579 : {
1580 96 : appendStringInfoString(buf, "<?xml");
1581 :
1582 96 : if (version)
1583 72 : appendStringInfo(buf, " version=\"%s\"", version);
1584 : else
1585 24 : appendStringInfo(buf, " version=\"%s\"", PG_XML_DEFAULT_VERSION);
1586 :
1587 96 : if (encoding && encoding != PG_UTF8)
1588 : {
1589 : /*
1590 : * XXX might be useful to convert this to IANA names (ISO-8859-1
1591 : * instead of LATIN1 etc.); needs field experience
1592 : */
1593 0 : appendStringInfo(buf, " encoding=\"%s\"",
1594 : pg_encoding_to_char(encoding));
1595 : }
1596 :
1597 96 : if (standalone == 1)
1598 48 : appendStringInfoString(buf, " standalone=\"yes\"");
1599 48 : else if (standalone == 0)
1600 24 : appendStringInfoString(buf, " standalone=\"no\"");
1601 96 : appendStringInfoString(buf, "?>");
1602 :
1603 96 : return true;
1604 : }
1605 : else
1606 23036 : return false;
1607 : }
1608 :
1609 : /*
1610 : * Test whether an input that is to be parsed as CONTENT contains a DTD.
1611 : *
1612 : * The SQL/XML:2003 definition of CONTENT ("XMLDecl? content") is not
1613 : * satisfied by a document with a DTD, which is a bit of a wart, as it means
1614 : * the CONTENT type is not a proper superset of DOCUMENT. SQL/XML:2006 and
1615 : * later fix that, by redefining content with reference to the "more
1616 : * permissive" Document Node of the XQuery/XPath Data Model, such that any
1617 : * DOCUMENT value is indeed also a CONTENT value. That definition is more
1618 : * useful, as CONTENT becomes usable for parsing input of unknown form (think
1619 : * pg_restore).
1620 : *
1621 : * As used below in parse_xml when parsing for CONTENT, libxml does not give
1622 : * us the 2006+ behavior, but only the 2003; it will choke if the input has
1623 : * a DTD. But we can provide the 2006+ definition of CONTENT easily enough,
1624 : * by detecting this case first and simply doing the parse as DOCUMENT.
1625 : *
1626 : * A DTD can be found arbitrarily far in, but that would be a contrived case;
1627 : * it will ordinarily start within a few dozen characters. The only things
1628 : * that can precede it are an XMLDecl (here, the caller will have called
1629 : * parse_xml_decl already), whitespace, comments, and processing instructions.
1630 : * This function need only return true if it sees a valid sequence of such
1631 : * things leading to <!DOCTYPE. It can simply return false in any other
1632 : * cases, including malformed input; that will mean the input gets parsed as
1633 : * CONTENT as originally planned, with libxml reporting any errors.
1634 : *
1635 : * This is only to be called from xml_parse, when pg_xml_init has already
1636 : * been called. The input is already in UTF8 encoding.
1637 : */
1638 : static bool
1639 936 : xml_doctype_in_content(const xmlChar *str)
1640 : {
1641 936 : const xmlChar *p = str;
1642 :
1643 : for (;;)
1644 36 : {
1645 : const xmlChar *e;
1646 :
1647 1062 : SKIP_XML_SPACE(p);
1648 972 : if (*p != '<')
1649 194 : return false;
1650 778 : p++;
1651 :
1652 778 : if (*p == '!')
1653 : {
1654 72 : p++;
1655 :
1656 : /* if we see <!DOCTYPE, we can return true */
1657 72 : if (xmlStrncmp(p, (xmlChar *) "DOCTYPE", 7) == 0)
1658 42 : return true;
1659 :
1660 : /* otherwise, if it's not a comment, fail */
1661 30 : if (xmlStrncmp(p, (xmlChar *) "--", 2) != 0)
1662 0 : return false;
1663 : /* find end of comment: find -- and a > must follow */
1664 30 : p = xmlStrstr(p + 2, (xmlChar *) "--");
1665 30 : if (!p || p[2] != '>')
1666 0 : return false;
1667 : /* advance over comment, and keep scanning */
1668 30 : p += 3;
1669 30 : continue;
1670 : }
1671 :
1672 : /* otherwise, if it's not a PI <?target something?>, fail */
1673 706 : if (*p != '?')
1674 700 : return false;
1675 6 : p++;
1676 :
1677 : /* find end of PI (the string ?> is forbidden within a PI) */
1678 6 : e = xmlStrstr(p, (xmlChar *) "?>");
1679 6 : if (!e)
1680 0 : return false;
1681 :
1682 : /* advance over PI, keep scanning */
1683 6 : p = e + 2;
1684 : }
1685 : }
1686 :
1687 :
1688 : /*
1689 : * Convert a text object to XML internal representation
1690 : *
1691 : * data is the source data (must not be toasted!), encoding is its encoding,
1692 : * and xmloption_arg and preserve_whitespace are options for the
1693 : * transformation.
1694 : *
1695 : * If parsed_xmloptiontype isn't NULL, *parsed_xmloptiontype is set to the
1696 : * XmlOptionType actually used to parse the input (typically the same as
1697 : * xmloption_arg, but a DOCTYPE node in the input can force DOCUMENT mode).
1698 : *
1699 : * If parsed_nodes isn't NULL and the input is not an XML document, the list
1700 : * of parsed nodes from the xmlParseBalancedChunkMemory call will be returned
1701 : * to *parsed_nodes.
1702 : *
1703 : * Errors normally result in ereport(ERROR), but if escontext is an
1704 : * ErrorSaveContext, then "safe" errors are reported there instead, and the
1705 : * caller must check SOFT_ERROR_OCCURRED() to see whether that happened.
1706 : *
1707 : * Note: it is caller's responsibility to xmlFreeDoc() the result,
1708 : * else a permanent memory leak will ensue! But note the result could
1709 : * be NULL after a soft error.
1710 : *
1711 : * TODO maybe libxml2's xmlreader is better? (do not construct DOM,
1712 : * yet do not use SAX - see xmlreader.c)
1713 : */
1714 : static xmlDocPtr
1715 1236 : xml_parse(text *data, XmlOptionType xmloption_arg,
1716 : bool preserve_whitespace, int encoding,
1717 : XmlOptionType *parsed_xmloptiontype, xmlNodePtr *parsed_nodes,
1718 : Node *escontext)
1719 : {
1720 : int32 len;
1721 : xmlChar *string;
1722 : xmlChar *utf8string;
1723 : PgXmlErrorContext *xmlerrcxt;
1724 1236 : volatile xmlParserCtxtPtr ctxt = NULL;
1725 1236 : volatile xmlDocPtr doc = NULL;
1726 :
1727 : /*
1728 : * This step looks annoyingly redundant, but we must do it to have a
1729 : * null-terminated string in case encoding conversion isn't required.
1730 : */
1731 1236 : len = VARSIZE_ANY_EXHDR(data); /* will be useful later */
1732 1236 : string = xml_text2xmlChar(data);
1733 :
1734 : /*
1735 : * If the data isn't UTF8, we must translate before giving it to libxml.
1736 : *
1737 : * XXX ideally, we'd catch any encoding conversion failure and return a
1738 : * soft error. However, failure to convert to UTF8 should be pretty darn
1739 : * rare, so for now this is left undone.
1740 : */
1741 1236 : utf8string = pg_do_encoding_conversion(string,
1742 : len,
1743 : encoding,
1744 : PG_UTF8);
1745 :
1746 : /* Start up libxml and its parser */
1747 1236 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_WELLFORMED);
1748 :
1749 : /* Use a TRY block to ensure we clean up correctly */
1750 1236 : PG_TRY();
1751 : {
1752 1236 : bool parse_as_document = false;
1753 : int res_code;
1754 1236 : size_t count = 0;
1755 1236 : xmlChar *version = NULL;
1756 1236 : int standalone = 0;
1757 :
1758 : /* Any errors here are reported as hard ereport's */
1759 1236 : xmlInitParser();
1760 :
1761 1236 : ctxt = xmlNewParserCtxt();
1762 1236 : if (ctxt == NULL || xmlerrcxt->err_occurred)
1763 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1764 : "could not allocate parser context");
1765 :
1766 : /* Decide whether to parse as document or content */
1767 1236 : if (xmloption_arg == XMLOPTION_DOCUMENT)
1768 288 : parse_as_document = true;
1769 : else
1770 : {
1771 : /* Parse and skip over the XML declaration, if any */
1772 948 : res_code = parse_xml_decl(utf8string,
1773 : &count, &version, NULL, &standalone);
1774 948 : if (res_code != 0)
1775 : {
1776 12 : errsave(escontext,
1777 : errcode(ERRCODE_INVALID_XML_CONTENT),
1778 : errmsg_internal("invalid XML content: invalid XML declaration"),
1779 : errdetail_for_xml_code(res_code));
1780 12 : goto fail;
1781 : }
1782 :
1783 : /* Is there a DOCTYPE element? */
1784 936 : if (xml_doctype_in_content(utf8string + count))
1785 42 : parse_as_document = true;
1786 : }
1787 :
1788 : /* initialize output parameters */
1789 1224 : if (parsed_xmloptiontype != NULL)
1790 132 : *parsed_xmloptiontype = parse_as_document ? XMLOPTION_DOCUMENT :
1791 : XMLOPTION_CONTENT;
1792 1224 : if (parsed_nodes != NULL)
1793 132 : *parsed_nodes = NULL;
1794 :
1795 1224 : if (parse_as_document)
1796 : {
1797 : /*
1798 : * Note, that here we try to apply DTD defaults
1799 : * (XML_PARSE_DTDATTR) according to SQL/XML:2008 GR 10.16.7.d:
1800 : * 'Default values defined by internal DTD are applied'. As for
1801 : * external DTDs, we try to support them too, (see SQL/XML:2008 GR
1802 : * 10.16.7.e)
1803 : */
1804 330 : doc = xmlCtxtReadDoc(ctxt, utf8string,
1805 : NULL,
1806 : "UTF-8",
1807 : XML_PARSE_NOENT | XML_PARSE_DTDATTR
1808 : | (preserve_whitespace ? 0 : XML_PARSE_NOBLANKS));
1809 330 : if (doc == NULL || xmlerrcxt->err_occurred)
1810 : {
1811 : /* Use original option to decide which error code to report */
1812 144 : if (xmloption_arg == XMLOPTION_DOCUMENT)
1813 138 : xml_errsave(escontext, xmlerrcxt,
1814 : ERRCODE_INVALID_XML_DOCUMENT,
1815 : "invalid XML document");
1816 : else
1817 6 : xml_errsave(escontext, xmlerrcxt,
1818 : ERRCODE_INVALID_XML_CONTENT,
1819 : "invalid XML content");
1820 96 : goto fail;
1821 : }
1822 : }
1823 : else
1824 : {
1825 894 : doc = xmlNewDoc(version);
1826 894 : if (doc == NULL || xmlerrcxt->err_occurred)
1827 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1828 : "could not allocate XML document");
1829 :
1830 : Assert(doc->encoding == NULL);
1831 894 : doc->encoding = xmlStrdup((const xmlChar *) "UTF-8");
1832 894 : if (doc->encoding == NULL || xmlerrcxt->err_occurred)
1833 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1834 : "could not allocate XML document");
1835 894 : doc->standalone = standalone;
1836 :
1837 : /* allow empty content */
1838 894 : if (*(utf8string + count))
1839 : {
1840 1740 : res_code = xmlParseBalancedChunkMemory(doc, NULL, NULL, 0,
1841 870 : utf8string + count,
1842 : parsed_nodes);
1843 870 : if (res_code != 0 || xmlerrcxt->err_occurred)
1844 : {
1845 60 : xml_errsave(escontext, xmlerrcxt,
1846 : ERRCODE_INVALID_XML_CONTENT,
1847 : "invalid XML content");
1848 12 : goto fail;
1849 : }
1850 : }
1851 : }
1852 :
1853 1140 : fail:
1854 : ;
1855 : }
1856 96 : PG_CATCH();
1857 : {
1858 96 : if (doc != NULL)
1859 48 : xmlFreeDoc(doc);
1860 96 : if (ctxt != NULL)
1861 96 : xmlFreeParserCtxt(ctxt);
1862 :
1863 96 : pg_xml_done(xmlerrcxt, true);
1864 :
1865 96 : PG_RE_THROW();
1866 : }
1867 1140 : PG_END_TRY();
1868 :
1869 1140 : xmlFreeParserCtxt(ctxt);
1870 :
1871 1140 : pg_xml_done(xmlerrcxt, false);
1872 :
1873 1140 : return doc;
1874 : }
1875 :
1876 :
1877 : /*
1878 : * xmlChar<->text conversions
1879 : */
1880 : static xmlChar *
1881 1374 : xml_text2xmlChar(text *in)
1882 : {
1883 1374 : return (xmlChar *) text_to_cstring(in);
1884 : }
1885 :
1886 :
1887 : #ifdef USE_LIBXMLCONTEXT
1888 :
1889 : /*
1890 : * Manage the special context used for all libxml allocations (but only
1891 : * in special debug builds; see notes at top of file)
1892 : */
1893 : static void
1894 : xml_memory_init(void)
1895 : {
1896 : /* Create memory context if not there already */
1897 : if (LibxmlContext == NULL)
1898 : LibxmlContext = AllocSetContextCreate(TopMemoryContext,
1899 : "Libxml context",
1900 : ALLOCSET_DEFAULT_SIZES);
1901 :
1902 : /* Re-establish the callbacks even if already set */
1903 : xmlMemSetup(xml_pfree, xml_palloc, xml_repalloc, xml_pstrdup);
1904 : }
1905 :
1906 : /*
1907 : * Wrappers for memory management functions
1908 : */
1909 : static void *
1910 : xml_palloc(size_t size)
1911 : {
1912 : return MemoryContextAlloc(LibxmlContext, size);
1913 : }
1914 :
1915 :
1916 : static void *
1917 : xml_repalloc(void *ptr, size_t size)
1918 : {
1919 : return repalloc(ptr, size);
1920 : }
1921 :
1922 :
1923 : static void
1924 : xml_pfree(void *ptr)
1925 : {
1926 : /* At least some parts of libxml assume xmlFree(NULL) is allowed */
1927 : if (ptr)
1928 : pfree(ptr);
1929 : }
1930 :
1931 :
1932 : static char *
1933 : xml_pstrdup(const char *string)
1934 : {
1935 : return MemoryContextStrdup(LibxmlContext, string);
1936 : }
1937 : #endif /* USE_LIBXMLCONTEXT */
1938 :
1939 :
1940 : /*
1941 : * xmlPgEntityLoader --- entity loader callback function
1942 : *
1943 : * Silently prevent any external entity URL from being loaded. We don't want
1944 : * to throw an error, so instead make the entity appear to expand to an empty
1945 : * string.
1946 : *
1947 : * We would prefer to allow loading entities that exist in the system's
1948 : * global XML catalog; but the available libxml2 APIs make that a complex
1949 : * and fragile task. For now, just shut down all external access.
1950 : */
1951 : static xmlParserInputPtr
1952 30 : xmlPgEntityLoader(const char *URL, const char *ID,
1953 : xmlParserCtxtPtr ctxt)
1954 : {
1955 30 : return xmlNewStringInputStream(ctxt, (const xmlChar *) "");
1956 : }
1957 :
1958 :
1959 : /*
1960 : * xml_ereport --- report an XML-related error
1961 : *
1962 : * The "msg" is the SQL-level message; some can be adopted from the SQL/XML
1963 : * standard. This function adds libxml's native error message, if any, as
1964 : * detail.
1965 : *
1966 : * This is exported for modules that want to share the core libxml error
1967 : * handler. Note that pg_xml_init() *must* have been called previously.
1968 : */
1969 : void
1970 12 : xml_ereport(PgXmlErrorContext *errcxt, int level, int sqlcode, const char *msg)
1971 : {
1972 : char *detail;
1973 :
1974 : /* Defend against someone passing us a bogus context struct */
1975 12 : if (errcxt->magic != ERRCXT_MAGIC)
1976 0 : elog(ERROR, "xml_ereport called with invalid PgXmlErrorContext");
1977 :
1978 : /* Flag that the current libxml error has been reported */
1979 12 : errcxt->err_occurred = false;
1980 :
1981 : /* Include detail only if we have some text from libxml */
1982 12 : if (errcxt->err_buf.len > 0)
1983 12 : detail = errcxt->err_buf.data;
1984 : else
1985 0 : detail = NULL;
1986 :
1987 12 : ereport(level,
1988 : (errcode(sqlcode),
1989 : errmsg_internal("%s", msg),
1990 : detail ? errdetail_internal("%s", detail) : 0));
1991 0 : }
1992 :
1993 :
1994 : /*
1995 : * xml_errsave --- save an XML-related error
1996 : *
1997 : * If escontext is an ErrorSaveContext, error details are saved into it,
1998 : * and control returns normally.
1999 : *
2000 : * Otherwise, the error is thrown, so that this is equivalent to
2001 : * xml_ereport() with level == ERROR.
2002 : *
2003 : * This should be used only for errors that we're sure we do not need
2004 : * a transaction abort to clean up after.
2005 : */
2006 : static void
2007 204 : xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
2008 : int sqlcode, const char *msg)
2009 : {
2010 : char *detail;
2011 :
2012 : /* Defend against someone passing us a bogus context struct */
2013 204 : if (errcxt->magic != ERRCXT_MAGIC)
2014 0 : elog(ERROR, "xml_errsave called with invalid PgXmlErrorContext");
2015 :
2016 : /* Flag that the current libxml error has been reported */
2017 204 : errcxt->err_occurred = false;
2018 :
2019 : /* Include detail only if we have some text from libxml */
2020 204 : if (errcxt->err_buf.len > 0)
2021 204 : detail = errcxt->err_buf.data;
2022 : else
2023 0 : detail = NULL;
2024 :
2025 204 : errsave(escontext,
2026 : (errcode(sqlcode),
2027 : errmsg_internal("%s", msg),
2028 : detail ? errdetail_internal("%s", detail) : 0));
2029 108 : }
2030 :
2031 :
2032 : /*
2033 : * Error handler for libxml errors and warnings
2034 : */
2035 : static void
2036 398 : xml_errorHandler(void *data, PgXmlErrorPtr error)
2037 : {
2038 398 : PgXmlErrorContext *xmlerrcxt = (PgXmlErrorContext *) data;
2039 398 : xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) error->ctxt;
2040 398 : xmlParserInputPtr input = (ctxt != NULL) ? ctxt->input : NULL;
2041 398 : xmlNodePtr node = error->node;
2042 398 : const xmlChar *name = (node != NULL &&
2043 398 : node->type == XML_ELEMENT_NODE) ? node->name : NULL;
2044 398 : int domain = error->domain;
2045 398 : int level = error->level;
2046 : StringInfo errorBuf;
2047 :
2048 : /*
2049 : * Defend against someone passing us a bogus context struct.
2050 : *
2051 : * We force a backend exit if this check fails because longjmp'ing out of
2052 : * libxml would likely render it unsafe to use further.
2053 : */
2054 398 : if (xmlerrcxt->magic != ERRCXT_MAGIC)
2055 0 : elog(FATAL, "xml_errorHandler called with invalid PgXmlErrorContext");
2056 :
2057 : /*----------
2058 : * Older libxml versions report some errors differently.
2059 : * First, some errors were previously reported as coming from the parser
2060 : * domain but are now reported as coming from the namespace domain.
2061 : * Second, some warnings were upgraded to errors.
2062 : * We attempt to compensate for that here.
2063 : *----------
2064 : */
2065 398 : switch (error->code)
2066 : {
2067 30 : case XML_WAR_NS_URI:
2068 30 : level = XML_ERR_ERROR;
2069 30 : domain = XML_FROM_NAMESPACE;
2070 30 : break;
2071 :
2072 54 : case XML_ERR_NS_DECL_ERROR:
2073 : case XML_WAR_NS_URI_RELATIVE:
2074 : case XML_WAR_NS_COLUMN:
2075 : case XML_NS_ERR_XML_NAMESPACE:
2076 : case XML_NS_ERR_UNDEFINED_NAMESPACE:
2077 : case XML_NS_ERR_QNAME:
2078 : case XML_NS_ERR_ATTRIBUTE_REDEFINED:
2079 : case XML_NS_ERR_EMPTY:
2080 54 : domain = XML_FROM_NAMESPACE;
2081 54 : break;
2082 : }
2083 :
2084 : /* Decide whether to act on the error or not */
2085 398 : switch (domain)
2086 : {
2087 314 : case XML_FROM_PARSER:
2088 : case XML_FROM_NONE:
2089 : case XML_FROM_MEMORY:
2090 : case XML_FROM_IO:
2091 :
2092 : /*
2093 : * Suppress warnings about undeclared entities. We need to do
2094 : * this to avoid problems due to not loading DTD definitions.
2095 : */
2096 314 : if (error->code == XML_WAR_UNDECLARED_ENTITY)
2097 6 : return;
2098 :
2099 : /* Otherwise, accept error regardless of the parsing purpose */
2100 308 : break;
2101 :
2102 84 : default:
2103 : /* Ignore error if only doing well-formedness check */
2104 84 : if (xmlerrcxt->strictness == PG_XML_STRICTNESS_WELLFORMED)
2105 66 : return;
2106 18 : break;
2107 : }
2108 :
2109 : /* Prepare error message in errorBuf */
2110 326 : errorBuf = makeStringInfo();
2111 :
2112 326 : if (error->line > 0)
2113 326 : appendStringInfo(errorBuf, "line %d: ", error->line);
2114 326 : if (name != NULL)
2115 0 : appendStringInfo(errorBuf, "element %s: ", name);
2116 326 : if (error->message != NULL)
2117 326 : appendStringInfoString(errorBuf, error->message);
2118 : else
2119 0 : appendStringInfoString(errorBuf, "(no message provided)");
2120 :
2121 : /*
2122 : * Append context information to errorBuf.
2123 : *
2124 : * xmlParserPrintFileContext() uses libxml's "generic" error handler to
2125 : * write the context. Since we don't want to duplicate libxml
2126 : * functionality here, we set up a generic error handler temporarily.
2127 : *
2128 : * We use appendStringInfo() directly as libxml's generic error handler.
2129 : * This should work because it has essentially the same signature as
2130 : * libxml expects, namely (void *ptr, const char *msg, ...).
2131 : */
2132 326 : if (input != NULL)
2133 : {
2134 326 : xmlGenericErrorFunc errFuncSaved = xmlGenericError;
2135 326 : void *errCtxSaved = xmlGenericErrorContext;
2136 :
2137 326 : xmlSetGenericErrorFunc((void *) errorBuf,
2138 : (xmlGenericErrorFunc) appendStringInfo);
2139 :
2140 : /* Add context information to errorBuf */
2141 326 : appendStringInfoLineSeparator(errorBuf);
2142 :
2143 326 : xmlParserPrintFileContext(input);
2144 :
2145 : /* Restore generic error func */
2146 326 : xmlSetGenericErrorFunc(errCtxSaved, errFuncSaved);
2147 : }
2148 :
2149 : /* Get rid of any trailing newlines in errorBuf */
2150 326 : chopStringInfoNewlines(errorBuf);
2151 :
2152 : /*
2153 : * Legacy error handling mode. err_occurred is never set, we just add the
2154 : * message to err_buf. This mode exists because the xml2 contrib module
2155 : * uses our error-handling infrastructure, but we don't want to change its
2156 : * behaviour since it's deprecated anyway. This is also why we don't
2157 : * distinguish between notices, warnings and errors here --- the old-style
2158 : * generic error handler wouldn't have done that either.
2159 : */
2160 326 : if (xmlerrcxt->strictness == PG_XML_STRICTNESS_LEGACY)
2161 : {
2162 2 : appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
2163 2 : appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
2164 : errorBuf->len);
2165 :
2166 2 : destroyStringInfo(errorBuf);
2167 2 : return;
2168 : }
2169 :
2170 : /*
2171 : * We don't want to ereport() here because that'd probably leave libxml in
2172 : * an inconsistent state. Instead, we remember the error and ereport()
2173 : * from xml_ereport().
2174 : *
2175 : * Warnings and notices can be reported immediately since they won't cause
2176 : * a longjmp() out of libxml.
2177 : */
2178 324 : if (level >= XML_ERR_ERROR)
2179 : {
2180 318 : appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
2181 318 : appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
2182 : errorBuf->len);
2183 :
2184 318 : xmlerrcxt->err_occurred = true;
2185 : }
2186 6 : else if (level >= XML_ERR_WARNING)
2187 : {
2188 6 : ereport(WARNING,
2189 : (errmsg_internal("%s", errorBuf->data)));
2190 : }
2191 : else
2192 : {
2193 0 : ereport(NOTICE,
2194 : (errmsg_internal("%s", errorBuf->data)));
2195 : }
2196 :
2197 324 : destroyStringInfo(errorBuf);
2198 : }
2199 :
2200 :
2201 : /*
2202 : * Convert libxml error codes into textual errdetail messages.
2203 : *
2204 : * This should be called within an ereport or errsave invocation,
2205 : * just as errdetail would be.
2206 : *
2207 : * At the moment, we only need to cover those codes that we
2208 : * may raise in this file.
2209 : */
2210 : static int
2211 6 : errdetail_for_xml_code(int code)
2212 : {
2213 : const char *det;
2214 :
2215 6 : switch (code)
2216 : {
2217 0 : case XML_ERR_INVALID_CHAR:
2218 0 : det = gettext_noop("Invalid character value.");
2219 0 : break;
2220 0 : case XML_ERR_SPACE_REQUIRED:
2221 0 : det = gettext_noop("Space required.");
2222 0 : break;
2223 6 : case XML_ERR_STANDALONE_VALUE:
2224 6 : det = gettext_noop("standalone accepts only 'yes' or 'no'.");
2225 6 : break;
2226 0 : case XML_ERR_VERSION_MISSING:
2227 0 : det = gettext_noop("Malformed declaration: missing version.");
2228 0 : break;
2229 0 : case XML_ERR_MISSING_ENCODING:
2230 0 : det = gettext_noop("Missing encoding in text declaration.");
2231 0 : break;
2232 0 : case XML_ERR_XMLDECL_NOT_FINISHED:
2233 0 : det = gettext_noop("Parsing XML declaration: '?>' expected.");
2234 0 : break;
2235 0 : default:
2236 0 : det = gettext_noop("Unrecognized libxml error code: %d.");
2237 0 : break;
2238 : }
2239 :
2240 6 : return errdetail(det, code);
2241 : }
2242 :
2243 :
2244 : /*
2245 : * Remove all trailing newlines from a StringInfo string
2246 : */
2247 : static void
2248 972 : chopStringInfoNewlines(StringInfo str)
2249 : {
2250 1624 : while (str->len > 0 && str->data[str->len - 1] == '\n')
2251 652 : str->data[--str->len] = '\0';
2252 972 : }
2253 :
2254 :
2255 : /*
2256 : * Append a newline after removing any existing trailing newlines
2257 : */
2258 : static void
2259 646 : appendStringInfoLineSeparator(StringInfo str)
2260 : {
2261 646 : chopStringInfoNewlines(str);
2262 646 : if (str->len > 0)
2263 428 : appendStringInfoChar(str, '\n');
2264 646 : }
2265 :
2266 :
2267 : /*
2268 : * Convert one char in the current server encoding to a Unicode codepoint.
2269 : */
2270 : static pg_wchar
2271 18280 : sqlchar_to_unicode(const char *s)
2272 : {
2273 : char *utf8string;
2274 : pg_wchar ret[2]; /* need space for trailing zero */
2275 :
2276 : /* note we're not assuming s is null-terminated */
2277 18280 : utf8string = pg_server_to_any(s, pg_mblen(s), PG_UTF8);
2278 :
2279 18280 : pg_encoding_mb2wchar_with_len(PG_UTF8, utf8string, ret,
2280 : pg_encoding_mblen(PG_UTF8, utf8string));
2281 :
2282 18280 : if (utf8string != s)
2283 0 : pfree(utf8string);
2284 :
2285 18280 : return ret[0];
2286 : }
2287 :
2288 :
2289 : static bool
2290 3638 : is_valid_xml_namefirst(pg_wchar c)
2291 : {
2292 : /* (Letter | '_' | ':') */
2293 3644 : return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
2294 7282 : || c == '_' || c == ':');
2295 : }
2296 :
2297 :
2298 : static bool
2299 14642 : is_valid_xml_namechar(pg_wchar c)
2300 : {
2301 : /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
2302 15532 : return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
2303 890 : || xmlIsDigitQ(c)
2304 254 : || c == '.' || c == '-' || c == '_' || c == ':'
2305 12 : || xmlIsCombiningQ(c)
2306 31064 : || xmlIsExtenderQ(c));
2307 : }
2308 : #endif /* USE_LIBXML */
2309 :
2310 :
2311 : /*
2312 : * Map SQL identifier to XML name; see SQL/XML:2008 section 9.1.
2313 : */
2314 : char *
2315 3652 : map_sql_identifier_to_xml_name(const char *ident, bool fully_escaped,
2316 : bool escape_period)
2317 : {
2318 : #ifdef USE_LIBXML
2319 : StringInfoData buf;
2320 : const char *p;
2321 :
2322 : /*
2323 : * SQL/XML doesn't make use of this case anywhere, so it's probably a
2324 : * mistake.
2325 : */
2326 : Assert(fully_escaped || !escape_period);
2327 :
2328 3652 : initStringInfo(&buf);
2329 :
2330 21952 : for (p = ident; *p; p += pg_mblen(p))
2331 : {
2332 18300 : if (*p == ':' && (p == ident || fully_escaped))
2333 14 : appendStringInfoString(&buf, "_x003A_");
2334 18286 : else if (*p == '_' && *(p + 1) == 'x')
2335 6 : appendStringInfoString(&buf, "_x005F_");
2336 21568 : else if (fully_escaped && p == ident &&
2337 3288 : pg_strncasecmp(p, "xml", 3) == 0)
2338 : {
2339 0 : if (*p == 'x')
2340 0 : appendStringInfoString(&buf, "_x0078_");
2341 : else
2342 0 : appendStringInfoString(&buf, "_x0058_");
2343 : }
2344 18280 : else if (escape_period && *p == '.')
2345 0 : appendStringInfoString(&buf, "_x002E_");
2346 : else
2347 : {
2348 18280 : pg_wchar u = sqlchar_to_unicode(p);
2349 :
2350 36560 : if ((p == ident)
2351 3638 : ? !is_valid_xml_namefirst(u)
2352 14642 : : !is_valid_xml_namechar(u))
2353 18 : appendStringInfo(&buf, "_x%04X_", (unsigned int) u);
2354 : else
2355 18262 : appendBinaryStringInfo(&buf, p, pg_mblen(p));
2356 : }
2357 : }
2358 :
2359 3652 : return buf.data;
2360 : #else /* not USE_LIBXML */
2361 : NO_XML_SUPPORT();
2362 : return NULL;
2363 : #endif /* not USE_LIBXML */
2364 : }
2365 :
2366 :
2367 : /*
2368 : * Map XML name to SQL identifier; see SQL/XML:2008 section 9.3.
2369 : */
2370 : char *
2371 128 : map_xml_name_to_sql_identifier(const char *name)
2372 : {
2373 : StringInfoData buf;
2374 : const char *p;
2375 :
2376 128 : initStringInfo(&buf);
2377 :
2378 704 : for (p = name; *p; p += pg_mblen(p))
2379 : {
2380 576 : if (*p == '_' && *(p + 1) == 'x'
2381 16 : && isxdigit((unsigned char) *(p + 2))
2382 16 : && isxdigit((unsigned char) *(p + 3))
2383 16 : && isxdigit((unsigned char) *(p + 4))
2384 16 : && isxdigit((unsigned char) *(p + 5))
2385 16 : && *(p + 6) == '_')
2386 16 : {
2387 : char cbuf[MAX_UNICODE_EQUIVALENT_STRING + 1];
2388 : unsigned int u;
2389 :
2390 16 : sscanf(p + 2, "%X", &u);
2391 16 : pg_unicode_to_server(u, (unsigned char *) cbuf);
2392 16 : appendStringInfoString(&buf, cbuf);
2393 16 : p += 6;
2394 : }
2395 : else
2396 560 : appendBinaryStringInfo(&buf, p, pg_mblen(p));
2397 : }
2398 :
2399 128 : return buf.data;
2400 : }
2401 :
2402 : /*
2403 : * Map SQL value to XML value; see SQL/XML:2008 section 9.8.
2404 : *
2405 : * When xml_escape_strings is true, then certain characters in string
2406 : * values are replaced by entity references (< etc.), as specified
2407 : * in SQL/XML:2008 section 9.8 GR 9) a) iii). This is normally what is
2408 : * wanted. The false case is mainly useful when the resulting value
2409 : * is used with xmlTextWriterWriteAttribute() to write out an
2410 : * attribute, because that function does the escaping itself.
2411 : */
2412 : char *
2413 131578 : map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
2414 : {
2415 131578 : if (type_is_array_domain(type))
2416 : {
2417 : ArrayType *array;
2418 : Oid elmtype;
2419 : int16 elmlen;
2420 : bool elmbyval;
2421 : char elmalign;
2422 : int num_elems;
2423 : Datum *elem_values;
2424 : bool *elem_nulls;
2425 : StringInfoData buf;
2426 : int i;
2427 :
2428 6 : array = DatumGetArrayTypeP(value);
2429 6 : elmtype = ARR_ELEMTYPE(array);
2430 6 : get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);
2431 :
2432 6 : deconstruct_array(array, elmtype,
2433 : elmlen, elmbyval, elmalign,
2434 : &elem_values, &elem_nulls,
2435 : &num_elems);
2436 :
2437 6 : initStringInfo(&buf);
2438 :
2439 24 : for (i = 0; i < num_elems; i++)
2440 : {
2441 18 : if (elem_nulls[i])
2442 0 : continue;
2443 18 : appendStringInfoString(&buf, "<element>");
2444 18 : appendStringInfoString(&buf,
2445 18 : map_sql_value_to_xml_value(elem_values[i],
2446 : elmtype, true));
2447 18 : appendStringInfoString(&buf, "</element>");
2448 : }
2449 :
2450 6 : pfree(elem_values);
2451 6 : pfree(elem_nulls);
2452 :
2453 6 : return buf.data;
2454 : }
2455 : else
2456 : {
2457 : Oid typeOut;
2458 : bool isvarlena;
2459 : char *str;
2460 :
2461 : /*
2462 : * Flatten domains; the special-case treatments below should apply to,
2463 : * eg, domains over boolean not just boolean.
2464 : */
2465 131572 : type = getBaseType(type);
2466 :
2467 : /*
2468 : * Special XSD formatting for some data types
2469 : */
2470 131572 : switch (type)
2471 : {
2472 66 : case BOOLOID:
2473 66 : if (DatumGetBool(value))
2474 60 : return "true";
2475 : else
2476 6 : return "false";
2477 :
2478 48 : case DATEOID:
2479 : {
2480 : DateADT date;
2481 : struct pg_tm tm;
2482 : char buf[MAXDATELEN + 1];
2483 :
2484 48 : date = DatumGetDateADT(value);
2485 : /* XSD doesn't support infinite values */
2486 48 : if (DATE_NOT_FINITE(date))
2487 0 : ereport(ERROR,
2488 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2489 : errmsg("date out of range"),
2490 : errdetail("XML does not support infinite date values.")));
2491 48 : j2date(date + POSTGRES_EPOCH_JDATE,
2492 : &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
2493 48 : EncodeDateOnly(&tm, USE_XSD_DATES, buf);
2494 :
2495 48 : return pstrdup(buf);
2496 : }
2497 :
2498 36 : case TIMESTAMPOID:
2499 : {
2500 : Timestamp timestamp;
2501 : struct pg_tm tm;
2502 : fsec_t fsec;
2503 : char buf[MAXDATELEN + 1];
2504 :
2505 36 : timestamp = DatumGetTimestamp(value);
2506 :
2507 : /* XSD doesn't support infinite values */
2508 36 : if (TIMESTAMP_NOT_FINITE(timestamp))
2509 6 : ereport(ERROR,
2510 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2511 : errmsg("timestamp out of range"),
2512 : errdetail("XML does not support infinite timestamp values.")));
2513 30 : else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
2514 30 : EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
2515 : else
2516 0 : ereport(ERROR,
2517 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2518 : errmsg("timestamp out of range")));
2519 :
2520 30 : return pstrdup(buf);
2521 : }
2522 :
2523 24 : case TIMESTAMPTZOID:
2524 : {
2525 : TimestampTz timestamp;
2526 : struct pg_tm tm;
2527 : int tz;
2528 : fsec_t fsec;
2529 24 : const char *tzn = NULL;
2530 : char buf[MAXDATELEN + 1];
2531 :
2532 24 : timestamp = DatumGetTimestamp(value);
2533 :
2534 : /* XSD doesn't support infinite values */
2535 24 : if (TIMESTAMP_NOT_FINITE(timestamp))
2536 0 : ereport(ERROR,
2537 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2538 : errmsg("timestamp out of range"),
2539 : errdetail("XML does not support infinite timestamp values.")));
2540 24 : else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
2541 24 : EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
2542 : else
2543 0 : ereport(ERROR,
2544 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2545 : errmsg("timestamp out of range")));
2546 :
2547 24 : return pstrdup(buf);
2548 : }
2549 :
2550 : #ifdef USE_LIBXML
2551 36 : case BYTEAOID:
2552 : {
2553 36 : bytea *bstr = DatumGetByteaPP(value);
2554 : PgXmlErrorContext *xmlerrcxt;
2555 36 : volatile xmlBufferPtr buf = NULL;
2556 36 : volatile xmlTextWriterPtr writer = NULL;
2557 : char *result;
2558 :
2559 36 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
2560 :
2561 36 : PG_TRY();
2562 : {
2563 36 : buf = xmlBufferCreate();
2564 36 : if (buf == NULL || xmlerrcxt->err_occurred)
2565 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
2566 : "could not allocate xmlBuffer");
2567 36 : writer = xmlNewTextWriterMemory(buf, 0);
2568 36 : if (writer == NULL || xmlerrcxt->err_occurred)
2569 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
2570 : "could not allocate xmlTextWriter");
2571 :
2572 36 : if (xmlbinary == XMLBINARY_BASE64)
2573 30 : xmlTextWriterWriteBase64(writer, VARDATA_ANY(bstr),
2574 30 : 0, VARSIZE_ANY_EXHDR(bstr));
2575 : else
2576 6 : xmlTextWriterWriteBinHex(writer, VARDATA_ANY(bstr),
2577 6 : 0, VARSIZE_ANY_EXHDR(bstr));
2578 :
2579 : /* we MUST do this now to flush data out to the buffer */
2580 36 : xmlFreeTextWriter(writer);
2581 36 : writer = NULL;
2582 :
2583 36 : result = pstrdup((const char *) xmlBufferContent(buf));
2584 : }
2585 0 : PG_CATCH();
2586 : {
2587 0 : if (writer)
2588 0 : xmlFreeTextWriter(writer);
2589 0 : if (buf)
2590 0 : xmlBufferFree(buf);
2591 :
2592 0 : pg_xml_done(xmlerrcxt, true);
2593 :
2594 0 : PG_RE_THROW();
2595 : }
2596 36 : PG_END_TRY();
2597 :
2598 36 : xmlBufferFree(buf);
2599 :
2600 36 : pg_xml_done(xmlerrcxt, false);
2601 :
2602 36 : return result;
2603 : }
2604 : #endif /* USE_LIBXML */
2605 :
2606 : }
2607 :
2608 : /*
2609 : * otherwise, just use the type's native text representation
2610 : */
2611 131362 : getTypeOutputInfo(type, &typeOut, &isvarlena);
2612 131362 : str = OidOutputFunctionCall(typeOut, value);
2613 :
2614 : /* ... exactly as-is for XML, and when escaping is not wanted */
2615 131362 : if (type == XMLOID || !xml_escape_strings)
2616 21838 : return str;
2617 :
2618 : /* otherwise, translate special characters as needed */
2619 109524 : return escape_xml(str);
2620 : }
2621 : }
2622 :
2623 :
2624 : /*
2625 : * Escape characters in text that have special meanings in XML.
2626 : *
2627 : * Returns a palloc'd string.
2628 : *
2629 : * NB: this is intentionally not dependent on libxml.
2630 : */
2631 : char *
2632 109770 : escape_xml(const char *str)
2633 : {
2634 : StringInfoData buf;
2635 : const char *p;
2636 :
2637 109770 : initStringInfo(&buf);
2638 681430 : for (p = str; *p; p++)
2639 : {
2640 571660 : switch (*p)
2641 : {
2642 0 : case '&':
2643 0 : appendStringInfoString(&buf, "&");
2644 0 : break;
2645 36 : case '<':
2646 36 : appendStringInfoString(&buf, "<");
2647 36 : break;
2648 24 : case '>':
2649 24 : appendStringInfoString(&buf, ">");
2650 24 : break;
2651 0 : case '\r':
2652 0 : appendStringInfoString(&buf, "
");
2653 0 : break;
2654 571600 : default:
2655 571600 : appendStringInfoCharMacro(&buf, *p);
2656 571600 : break;
2657 : }
2658 : }
2659 109770 : return buf.data;
2660 : }
2661 :
2662 :
2663 : static char *
2664 24 : _SPI_strdup(const char *s)
2665 : {
2666 24 : size_t len = strlen(s) + 1;
2667 24 : char *ret = SPI_palloc(len);
2668 :
2669 24 : memcpy(ret, s, len);
2670 24 : return ret;
2671 : }
2672 :
2673 :
2674 : /*
2675 : * SQL to XML mapping functions
2676 : *
2677 : * What follows below was at one point intentionally organized so that
2678 : * you can read along in the SQL/XML standard. The functions are
2679 : * mostly split up the way the clauses lay out in the standards
2680 : * document, and the identifiers are also aligned with the standard
2681 : * text. Unfortunately, SQL/XML:2006 reordered the clauses
2682 : * differently than SQL/XML:2003, so the order below doesn't make much
2683 : * sense anymore.
2684 : *
2685 : * There are many things going on there:
2686 : *
2687 : * There are two kinds of mappings: Mapping SQL data (table contents)
2688 : * to XML documents, and mapping SQL structure (the "schema") to XML
2689 : * Schema. And there are functions that do both at the same time.
2690 : *
2691 : * Then you can map a database, a schema, or a table, each in both
2692 : * ways. This breaks down recursively: Mapping a database invokes
2693 : * mapping schemas, which invokes mapping tables, which invokes
2694 : * mapping rows, which invokes mapping columns, although you can't
2695 : * call the last two from the outside. Because of this, there are a
2696 : * number of xyz_internal() functions which are to be called both from
2697 : * the function manager wrapper and from some upper layer in a
2698 : * recursive call.
2699 : *
2700 : * See the documentation about what the common function arguments
2701 : * nulls, tableforest, and targetns mean.
2702 : *
2703 : * Some style guidelines for XML output: Use double quotes for quoting
2704 : * XML attributes. Indent XML elements by two spaces, but remember
2705 : * that a lot of code is called recursively at different levels, so
2706 : * it's better not to indent rather than create output that indents
2707 : * and outdents weirdly. Add newlines to make the output look nice.
2708 : */
2709 :
2710 :
2711 : /*
2712 : * Visibility of objects for XML mappings; see SQL/XML:2008 section
2713 : * 4.10.8.
2714 : */
2715 :
2716 : /*
2717 : * Given a query, which must return type oid as first column, produce
2718 : * a list of Oids with the query results.
2719 : */
2720 : static List *
2721 36 : query_to_oid_list(const char *query)
2722 : {
2723 : uint64 i;
2724 36 : List *list = NIL;
2725 : int spi_result;
2726 :
2727 36 : spi_result = SPI_execute(query, true, 0);
2728 36 : if (spi_result != SPI_OK_SELECT)
2729 0 : elog(ERROR, "SPI_execute returned %s for %s",
2730 : SPI_result_code_string(spi_result), query);
2731 :
2732 108 : for (i = 0; i < SPI_processed; i++)
2733 : {
2734 : Datum oid;
2735 : bool isnull;
2736 :
2737 72 : oid = SPI_getbinval(SPI_tuptable->vals[i],
2738 72 : SPI_tuptable->tupdesc,
2739 : 1,
2740 : &isnull);
2741 72 : if (!isnull)
2742 72 : list = lappend_oid(list, DatumGetObjectId(oid));
2743 : }
2744 :
2745 36 : return list;
2746 : }
2747 :
2748 :
2749 : static List *
2750 36 : schema_get_xml_visible_tables(Oid nspid)
2751 : {
2752 : StringInfoData query;
2753 :
2754 36 : initStringInfo(&query);
2755 36 : appendStringInfo(&query, "SELECT oid FROM pg_catalog.pg_class"
2756 : " WHERE relnamespace = %u AND relkind IN ("
2757 : CppAsString2(RELKIND_RELATION) ","
2758 : CppAsString2(RELKIND_MATVIEW) ","
2759 : CppAsString2(RELKIND_VIEW) ")"
2760 : " AND pg_catalog.has_table_privilege (oid, 'SELECT')"
2761 : " ORDER BY relname;", nspid);
2762 :
2763 36 : return query_to_oid_list(query.data);
2764 : }
2765 :
2766 :
2767 : /*
2768 : * Including the system schemas is probably not useful for a database
2769 : * mapping.
2770 : */
2771 : #define XML_VISIBLE_SCHEMAS_EXCLUDE "(nspname ~ '^pg_' OR nspname = 'information_schema')"
2772 :
2773 : #define XML_VISIBLE_SCHEMAS "SELECT oid FROM pg_catalog.pg_namespace WHERE pg_catalog.has_schema_privilege (oid, 'USAGE') AND NOT " XML_VISIBLE_SCHEMAS_EXCLUDE
2774 :
2775 :
2776 : static List *
2777 0 : database_get_xml_visible_schemas(void)
2778 : {
2779 0 : return query_to_oid_list(XML_VISIBLE_SCHEMAS " ORDER BY nspname;");
2780 : }
2781 :
2782 :
2783 : static List *
2784 0 : database_get_xml_visible_tables(void)
2785 : {
2786 : /* At the moment there is no order required here. */
2787 0 : return query_to_oid_list("SELECT oid FROM pg_catalog.pg_class"
2788 : " WHERE relkind IN ("
2789 : CppAsString2(RELKIND_RELATION) ","
2790 : CppAsString2(RELKIND_MATVIEW) ","
2791 : CppAsString2(RELKIND_VIEW) ")"
2792 : " AND pg_catalog.has_table_privilege(pg_class.oid, 'SELECT')"
2793 : " AND relnamespace IN (" XML_VISIBLE_SCHEMAS ");");
2794 : }
2795 :
2796 :
2797 : /*
2798 : * Map SQL table to XML and/or XML Schema document; see SQL/XML:2008
2799 : * section 9.11.
2800 : */
2801 :
2802 : static StringInfo
2803 96 : table_to_xml_internal(Oid relid,
2804 : const char *xmlschema, bool nulls, bool tableforest,
2805 : const char *targetns, bool top_level)
2806 : {
2807 : StringInfoData query;
2808 :
2809 96 : initStringInfo(&query);
2810 96 : appendStringInfo(&query, "SELECT * FROM %s",
2811 : DatumGetCString(DirectFunctionCall1(regclassout,
2812 : ObjectIdGetDatum(relid))));
2813 96 : return query_to_xml_internal(query.data, get_rel_name(relid),
2814 : xmlschema, nulls, tableforest,
2815 : targetns, top_level);
2816 : }
2817 :
2818 :
2819 : Datum
2820 36 : table_to_xml(PG_FUNCTION_ARGS)
2821 : {
2822 36 : Oid relid = PG_GETARG_OID(0);
2823 36 : bool nulls = PG_GETARG_BOOL(1);
2824 36 : bool tableforest = PG_GETARG_BOOL(2);
2825 36 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2826 :
2827 36 : PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid, NULL,
2828 : nulls, tableforest,
2829 : targetns, true)));
2830 : }
2831 :
2832 :
2833 : Datum
2834 10 : query_to_xml(PG_FUNCTION_ARGS)
2835 : {
2836 10 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
2837 10 : bool nulls = PG_GETARG_BOOL(1);
2838 10 : bool tableforest = PG_GETARG_BOOL(2);
2839 10 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2840 :
2841 10 : PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
2842 : NULL, nulls, tableforest,
2843 : targetns, true)));
2844 : }
2845 :
2846 :
2847 : Datum
2848 12 : cursor_to_xml(PG_FUNCTION_ARGS)
2849 : {
2850 12 : char *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
2851 12 : int32 count = PG_GETARG_INT32(1);
2852 12 : bool nulls = PG_GETARG_BOOL(2);
2853 12 : bool tableforest = PG_GETARG_BOOL(3);
2854 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(4));
2855 :
2856 : StringInfoData result;
2857 : Portal portal;
2858 : uint64 i;
2859 :
2860 12 : initStringInfo(&result);
2861 :
2862 12 : if (!tableforest)
2863 : {
2864 6 : xmldata_root_element_start(&result, "table", NULL, targetns, true);
2865 6 : appendStringInfoChar(&result, '\n');
2866 : }
2867 :
2868 12 : SPI_connect();
2869 12 : portal = SPI_cursor_find(name);
2870 12 : if (portal == NULL)
2871 0 : ereport(ERROR,
2872 : (errcode(ERRCODE_UNDEFINED_CURSOR),
2873 : errmsg("cursor \"%s\" does not exist", name)));
2874 :
2875 12 : SPI_cursor_fetch(portal, true, count);
2876 48 : for (i = 0; i < SPI_processed; i++)
2877 36 : SPI_sql_row_to_xmlelement(i, &result, NULL, nulls,
2878 : tableforest, targetns, true);
2879 :
2880 12 : SPI_finish();
2881 :
2882 12 : if (!tableforest)
2883 6 : xmldata_root_element_end(&result, "table");
2884 :
2885 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(&result));
2886 : }
2887 :
2888 :
2889 : /*
2890 : * Write the start tag of the root element of a data mapping.
2891 : *
2892 : * top_level means that this is the very top level of the eventual
2893 : * output. For example, when the user calls table_to_xml, then a call
2894 : * with a table name to this function is the top level. When the user
2895 : * calls database_to_xml, then a call with a schema name to this
2896 : * function is not the top level. If top_level is false, then the XML
2897 : * namespace declarations are omitted, because they supposedly already
2898 : * appeared earlier in the output. Repeating them is not wrong, but
2899 : * it looks ugly.
2900 : */
2901 : static void
2902 238 : xmldata_root_element_start(StringInfo result, const char *eltname,
2903 : const char *xmlschema, const char *targetns,
2904 : bool top_level)
2905 : {
2906 : /* This isn't really wrong but currently makes no sense. */
2907 : Assert(top_level || !xmlschema);
2908 :
2909 238 : appendStringInfo(result, "<%s", eltname);
2910 238 : if (top_level)
2911 : {
2912 178 : appendStringInfoString(result, " xmlns:xsi=\"" NAMESPACE_XSI "\"");
2913 178 : if (strlen(targetns) > 0)
2914 30 : appendStringInfo(result, " xmlns=\"%s\"", targetns);
2915 : }
2916 238 : if (xmlschema)
2917 : {
2918 : /* FIXME: better targets */
2919 18 : if (strlen(targetns) > 0)
2920 6 : appendStringInfo(result, " xsi:schemaLocation=\"%s #\"", targetns);
2921 : else
2922 12 : appendStringInfoString(result, " xsi:noNamespaceSchemaLocation=\"#\"");
2923 : }
2924 238 : appendStringInfoString(result, ">\n");
2925 238 : }
2926 :
2927 :
2928 : static void
2929 238 : xmldata_root_element_end(StringInfo result, const char *eltname)
2930 : {
2931 238 : appendStringInfo(result, "</%s>\n", eltname);
2932 238 : }
2933 :
2934 :
2935 : static StringInfo
2936 112 : query_to_xml_internal(const char *query, char *tablename,
2937 : const char *xmlschema, bool nulls, bool tableforest,
2938 : const char *targetns, bool top_level)
2939 : {
2940 : StringInfo result;
2941 : char *xmltn;
2942 : uint64 i;
2943 :
2944 112 : if (tablename)
2945 96 : xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
2946 : else
2947 16 : xmltn = "table";
2948 :
2949 112 : result = makeStringInfo();
2950 :
2951 112 : SPI_connect();
2952 112 : if (SPI_execute(query, true, 0) != SPI_OK_SELECT)
2953 0 : ereport(ERROR,
2954 : (errcode(ERRCODE_DATA_EXCEPTION),
2955 : errmsg("invalid query")));
2956 :
2957 112 : if (!tableforest)
2958 : {
2959 52 : xmldata_root_element_start(result, xmltn, xmlschema,
2960 : targetns, top_level);
2961 52 : appendStringInfoChar(result, '\n');
2962 : }
2963 :
2964 112 : if (xmlschema)
2965 30 : appendStringInfo(result, "%s\n\n", xmlschema);
2966 :
2967 388 : for (i = 0; i < SPI_processed; i++)
2968 276 : SPI_sql_row_to_xmlelement(i, result, tablename, nulls,
2969 : tableforest, targetns, top_level);
2970 :
2971 112 : if (!tableforest)
2972 52 : xmldata_root_element_end(result, xmltn);
2973 :
2974 112 : SPI_finish();
2975 :
2976 112 : return result;
2977 : }
2978 :
2979 :
2980 : Datum
2981 30 : table_to_xmlschema(PG_FUNCTION_ARGS)
2982 : {
2983 30 : Oid relid = PG_GETARG_OID(0);
2984 30 : bool nulls = PG_GETARG_BOOL(1);
2985 30 : bool tableforest = PG_GETARG_BOOL(2);
2986 30 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2987 : const char *result;
2988 : Relation rel;
2989 :
2990 30 : rel = table_open(relid, AccessShareLock);
2991 30 : result = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
2992 : tableforest, targetns);
2993 30 : table_close(rel, NoLock);
2994 :
2995 30 : PG_RETURN_XML_P(cstring_to_xmltype(result));
2996 : }
2997 :
2998 :
2999 : Datum
3000 6 : query_to_xmlschema(PG_FUNCTION_ARGS)
3001 : {
3002 6 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
3003 6 : bool nulls = PG_GETARG_BOOL(1);
3004 6 : bool tableforest = PG_GETARG_BOOL(2);
3005 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3006 : const char *result;
3007 : SPIPlanPtr plan;
3008 : Portal portal;
3009 :
3010 6 : SPI_connect();
3011 :
3012 6 : if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
3013 0 : elog(ERROR, "SPI_prepare(\"%s\") failed", query);
3014 :
3015 6 : if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
3016 0 : elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
3017 :
3018 6 : result = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
3019 : InvalidOid, nulls,
3020 : tableforest, targetns));
3021 6 : SPI_cursor_close(portal);
3022 6 : SPI_finish();
3023 :
3024 6 : PG_RETURN_XML_P(cstring_to_xmltype(result));
3025 : }
3026 :
3027 :
3028 : Datum
3029 12 : cursor_to_xmlschema(PG_FUNCTION_ARGS)
3030 : {
3031 12 : char *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
3032 12 : bool nulls = PG_GETARG_BOOL(1);
3033 12 : bool tableforest = PG_GETARG_BOOL(2);
3034 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3035 : const char *xmlschema;
3036 : Portal portal;
3037 :
3038 12 : SPI_connect();
3039 12 : portal = SPI_cursor_find(name);
3040 12 : if (portal == NULL)
3041 0 : ereport(ERROR,
3042 : (errcode(ERRCODE_UNDEFINED_CURSOR),
3043 : errmsg("cursor \"%s\" does not exist", name)));
3044 12 : if (portal->tupDesc == NULL)
3045 0 : ereport(ERROR,
3046 : (errcode(ERRCODE_INVALID_CURSOR_STATE),
3047 : errmsg("portal \"%s\" does not return tuples", name)));
3048 :
3049 12 : xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
3050 : InvalidOid, nulls,
3051 : tableforest, targetns));
3052 12 : SPI_finish();
3053 :
3054 12 : PG_RETURN_XML_P(cstring_to_xmltype(xmlschema));
3055 : }
3056 :
3057 :
3058 : Datum
3059 24 : table_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3060 : {
3061 24 : Oid relid = PG_GETARG_OID(0);
3062 24 : bool nulls = PG_GETARG_BOOL(1);
3063 24 : bool tableforest = PG_GETARG_BOOL(2);
3064 24 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3065 : Relation rel;
3066 : const char *xmlschema;
3067 :
3068 24 : rel = table_open(relid, AccessShareLock);
3069 24 : xmlschema = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
3070 : tableforest, targetns);
3071 24 : table_close(rel, NoLock);
3072 :
3073 24 : PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid,
3074 : xmlschema, nulls, tableforest,
3075 : targetns, true)));
3076 : }
3077 :
3078 :
3079 : Datum
3080 6 : query_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3081 : {
3082 6 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
3083 6 : bool nulls = PG_GETARG_BOOL(1);
3084 6 : bool tableforest = PG_GETARG_BOOL(2);
3085 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3086 :
3087 : const char *xmlschema;
3088 : SPIPlanPtr plan;
3089 : Portal portal;
3090 :
3091 6 : SPI_connect();
3092 :
3093 6 : if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
3094 0 : elog(ERROR, "SPI_prepare(\"%s\") failed", query);
3095 :
3096 6 : if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
3097 0 : elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
3098 :
3099 6 : xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
3100 : InvalidOid, nulls, tableforest, targetns));
3101 6 : SPI_cursor_close(portal);
3102 6 : SPI_finish();
3103 :
3104 6 : PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
3105 : xmlschema, nulls, tableforest,
3106 : targetns, true)));
3107 : }
3108 :
3109 :
3110 : /*
3111 : * Map SQL schema to XML and/or XML Schema document; see SQL/XML:2008
3112 : * sections 9.13, 9.14.
3113 : */
3114 :
3115 : static StringInfo
3116 18 : schema_to_xml_internal(Oid nspid, const char *xmlschema, bool nulls,
3117 : bool tableforest, const char *targetns, bool top_level)
3118 : {
3119 : StringInfo result;
3120 : char *xmlsn;
3121 : List *relid_list;
3122 : ListCell *cell;
3123 :
3124 18 : xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid),
3125 : true, false);
3126 18 : result = makeStringInfo();
3127 :
3128 18 : xmldata_root_element_start(result, xmlsn, xmlschema, targetns, top_level);
3129 18 : appendStringInfoChar(result, '\n');
3130 :
3131 18 : if (xmlschema)
3132 6 : appendStringInfo(result, "%s\n\n", xmlschema);
3133 :
3134 18 : SPI_connect();
3135 :
3136 18 : relid_list = schema_get_xml_visible_tables(nspid);
3137 :
3138 54 : foreach(cell, relid_list)
3139 : {
3140 36 : Oid relid = lfirst_oid(cell);
3141 : StringInfo subres;
3142 :
3143 36 : subres = table_to_xml_internal(relid, NULL, nulls, tableforest,
3144 : targetns, false);
3145 :
3146 36 : appendBinaryStringInfo(result, subres->data, subres->len);
3147 36 : appendStringInfoChar(result, '\n');
3148 : }
3149 :
3150 18 : SPI_finish();
3151 :
3152 18 : xmldata_root_element_end(result, xmlsn);
3153 :
3154 18 : return result;
3155 : }
3156 :
3157 :
3158 : Datum
3159 12 : schema_to_xml(PG_FUNCTION_ARGS)
3160 : {
3161 12 : Name name = PG_GETARG_NAME(0);
3162 12 : bool nulls = PG_GETARG_BOOL(1);
3163 12 : bool tableforest = PG_GETARG_BOOL(2);
3164 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3165 :
3166 : char *schemaname;
3167 : Oid nspid;
3168 :
3169 12 : schemaname = NameStr(*name);
3170 12 : nspid = LookupExplicitNamespace(schemaname, false);
3171 :
3172 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid, NULL,
3173 : nulls, tableforest, targetns, true)));
3174 : }
3175 :
3176 :
3177 : /*
3178 : * Write the start element of the root element of an XML Schema mapping.
3179 : */
3180 : static void
3181 96 : xsd_schema_element_start(StringInfo result, const char *targetns)
3182 : {
3183 96 : appendStringInfoString(result,
3184 : "<xsd:schema\n"
3185 : " xmlns:xsd=\"" NAMESPACE_XSD "\"");
3186 96 : if (strlen(targetns) > 0)
3187 18 : appendStringInfo(result,
3188 : "\n"
3189 : " targetNamespace=\"%s\"\n"
3190 : " elementFormDefault=\"qualified\"",
3191 : targetns);
3192 96 : appendStringInfoString(result,
3193 : ">\n\n");
3194 96 : }
3195 :
3196 :
3197 : static void
3198 96 : xsd_schema_element_end(StringInfo result)
3199 : {
3200 96 : appendStringInfoString(result, "</xsd:schema>");
3201 96 : }
3202 :
3203 :
3204 : static StringInfo
3205 18 : schema_to_xmlschema_internal(const char *schemaname, bool nulls,
3206 : bool tableforest, const char *targetns)
3207 : {
3208 : Oid nspid;
3209 : List *relid_list;
3210 : List *tupdesc_list;
3211 : ListCell *cell;
3212 : StringInfo result;
3213 :
3214 18 : result = makeStringInfo();
3215 :
3216 18 : nspid = LookupExplicitNamespace(schemaname, false);
3217 :
3218 18 : xsd_schema_element_start(result, targetns);
3219 :
3220 18 : SPI_connect();
3221 :
3222 18 : relid_list = schema_get_xml_visible_tables(nspid);
3223 :
3224 18 : tupdesc_list = NIL;
3225 54 : foreach(cell, relid_list)
3226 : {
3227 : Relation rel;
3228 :
3229 36 : rel = table_open(lfirst_oid(cell), AccessShareLock);
3230 36 : tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
3231 36 : table_close(rel, NoLock);
3232 : }
3233 :
3234 18 : appendStringInfoString(result,
3235 : map_sql_typecoll_to_xmlschema_types(tupdesc_list));
3236 :
3237 18 : appendStringInfoString(result,
3238 : map_sql_schema_to_xmlschema_types(nspid, relid_list,
3239 : nulls, tableforest, targetns));
3240 :
3241 18 : xsd_schema_element_end(result);
3242 :
3243 18 : SPI_finish();
3244 :
3245 18 : return result;
3246 : }
3247 :
3248 :
3249 : Datum
3250 12 : schema_to_xmlschema(PG_FUNCTION_ARGS)
3251 : {
3252 12 : Name name = PG_GETARG_NAME(0);
3253 12 : bool nulls = PG_GETARG_BOOL(1);
3254 12 : bool tableforest = PG_GETARG_BOOL(2);
3255 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3256 :
3257 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xmlschema_internal(NameStr(*name),
3258 : nulls, tableforest, targetns)));
3259 : }
3260 :
3261 :
3262 : Datum
3263 6 : schema_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3264 : {
3265 6 : Name name = PG_GETARG_NAME(0);
3266 6 : bool nulls = PG_GETARG_BOOL(1);
3267 6 : bool tableforest = PG_GETARG_BOOL(2);
3268 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3269 : char *schemaname;
3270 : Oid nspid;
3271 : StringInfo xmlschema;
3272 :
3273 6 : schemaname = NameStr(*name);
3274 6 : nspid = LookupExplicitNamespace(schemaname, false);
3275 :
3276 6 : xmlschema = schema_to_xmlschema_internal(schemaname, nulls,
3277 : tableforest, targetns);
3278 :
3279 6 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid,
3280 : xmlschema->data, nulls,
3281 : tableforest, targetns, true)));
3282 : }
3283 :
3284 :
3285 : /*
3286 : * Map SQL database to XML and/or XML Schema document; see SQL/XML:2008
3287 : * sections 9.16, 9.17.
3288 : */
3289 :
3290 : static StringInfo
3291 0 : database_to_xml_internal(const char *xmlschema, bool nulls,
3292 : bool tableforest, const char *targetns)
3293 : {
3294 : StringInfo result;
3295 : List *nspid_list;
3296 : ListCell *cell;
3297 : char *xmlcn;
3298 :
3299 0 : xmlcn = map_sql_identifier_to_xml_name(get_database_name(MyDatabaseId),
3300 : true, false);
3301 0 : result = makeStringInfo();
3302 :
3303 0 : xmldata_root_element_start(result, xmlcn, xmlschema, targetns, true);
3304 0 : appendStringInfoChar(result, '\n');
3305 :
3306 0 : if (xmlschema)
3307 0 : appendStringInfo(result, "%s\n\n", xmlschema);
3308 :
3309 0 : SPI_connect();
3310 :
3311 0 : nspid_list = database_get_xml_visible_schemas();
3312 :
3313 0 : foreach(cell, nspid_list)
3314 : {
3315 0 : Oid nspid = lfirst_oid(cell);
3316 : StringInfo subres;
3317 :
3318 0 : subres = schema_to_xml_internal(nspid, NULL, nulls,
3319 : tableforest, targetns, false);
3320 :
3321 0 : appendBinaryStringInfo(result, subres->data, subres->len);
3322 0 : appendStringInfoChar(result, '\n');
3323 : }
3324 :
3325 0 : SPI_finish();
3326 :
3327 0 : xmldata_root_element_end(result, xmlcn);
3328 :
3329 0 : return result;
3330 : }
3331 :
3332 :
3333 : Datum
3334 0 : database_to_xml(PG_FUNCTION_ARGS)
3335 : {
3336 0 : bool nulls = PG_GETARG_BOOL(0);
3337 0 : bool tableforest = PG_GETARG_BOOL(1);
3338 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3339 :
3340 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(NULL, nulls,
3341 : tableforest, targetns)));
3342 : }
3343 :
3344 :
3345 : static StringInfo
3346 0 : database_to_xmlschema_internal(bool nulls, bool tableforest,
3347 : const char *targetns)
3348 : {
3349 : List *relid_list;
3350 : List *nspid_list;
3351 : List *tupdesc_list;
3352 : ListCell *cell;
3353 : StringInfo result;
3354 :
3355 0 : result = makeStringInfo();
3356 :
3357 0 : xsd_schema_element_start(result, targetns);
3358 :
3359 0 : SPI_connect();
3360 :
3361 0 : relid_list = database_get_xml_visible_tables();
3362 0 : nspid_list = database_get_xml_visible_schemas();
3363 :
3364 0 : tupdesc_list = NIL;
3365 0 : foreach(cell, relid_list)
3366 : {
3367 : Relation rel;
3368 :
3369 0 : rel = table_open(lfirst_oid(cell), AccessShareLock);
3370 0 : tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
3371 0 : table_close(rel, NoLock);
3372 : }
3373 :
3374 0 : appendStringInfoString(result,
3375 : map_sql_typecoll_to_xmlschema_types(tupdesc_list));
3376 :
3377 0 : appendStringInfoString(result,
3378 : map_sql_catalog_to_xmlschema_types(nspid_list, nulls, tableforest, targetns));
3379 :
3380 0 : xsd_schema_element_end(result);
3381 :
3382 0 : SPI_finish();
3383 :
3384 0 : return result;
3385 : }
3386 :
3387 :
3388 : Datum
3389 0 : database_to_xmlschema(PG_FUNCTION_ARGS)
3390 : {
3391 0 : bool nulls = PG_GETARG_BOOL(0);
3392 0 : bool tableforest = PG_GETARG_BOOL(1);
3393 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3394 :
3395 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xmlschema_internal(nulls,
3396 : tableforest, targetns)));
3397 : }
3398 :
3399 :
3400 : Datum
3401 0 : database_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3402 : {
3403 0 : bool nulls = PG_GETARG_BOOL(0);
3404 0 : bool tableforest = PG_GETARG_BOOL(1);
3405 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3406 : StringInfo xmlschema;
3407 :
3408 0 : xmlschema = database_to_xmlschema_internal(nulls, tableforest, targetns);
3409 :
3410 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(xmlschema->data,
3411 : nulls, tableforest, targetns)));
3412 : }
3413 :
3414 :
3415 : /*
3416 : * Map a multi-part SQL name to an XML name; see SQL/XML:2008 section
3417 : * 9.2.
3418 : */
3419 : static char *
3420 384 : map_multipart_sql_identifier_to_xml_name(const char *a, const char *b, const char *c, const char *d)
3421 : {
3422 : StringInfoData result;
3423 :
3424 384 : initStringInfo(&result);
3425 :
3426 384 : if (a)
3427 384 : appendStringInfoString(&result,
3428 384 : map_sql_identifier_to_xml_name(a, true, true));
3429 384 : if (b)
3430 384 : appendStringInfo(&result, ".%s",
3431 : map_sql_identifier_to_xml_name(b, true, true));
3432 384 : if (c)
3433 384 : appendStringInfo(&result, ".%s",
3434 : map_sql_identifier_to_xml_name(c, true, true));
3435 384 : if (d)
3436 366 : appendStringInfo(&result, ".%s",
3437 : map_sql_identifier_to_xml_name(d, true, true));
3438 :
3439 384 : return result.data;
3440 : }
3441 :
3442 :
3443 : /*
3444 : * Map an SQL table to an XML Schema document; see SQL/XML:2008
3445 : * section 9.11.
3446 : *
3447 : * Map an SQL table to XML Schema data types; see SQL/XML:2008 section
3448 : * 9.9.
3449 : */
3450 : static const char *
3451 78 : map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid, bool nulls,
3452 : bool tableforest, const char *targetns)
3453 : {
3454 : int i;
3455 : char *xmltn;
3456 : char *tabletypename;
3457 : char *rowtypename;
3458 : StringInfoData result;
3459 :
3460 78 : initStringInfo(&result);
3461 :
3462 78 : if (OidIsValid(relid))
3463 : {
3464 : HeapTuple tuple;
3465 : Form_pg_class reltuple;
3466 :
3467 54 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
3468 54 : if (!HeapTupleIsValid(tuple))
3469 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
3470 54 : reltuple = (Form_pg_class) GETSTRUCT(tuple);
3471 :
3472 54 : xmltn = map_sql_identifier_to_xml_name(NameStr(reltuple->relname),
3473 : true, false);
3474 :
3475 54 : tabletypename = map_multipart_sql_identifier_to_xml_name("TableType",
3476 54 : get_database_name(MyDatabaseId),
3477 54 : get_namespace_name(reltuple->relnamespace),
3478 54 : NameStr(reltuple->relname));
3479 :
3480 54 : rowtypename = map_multipart_sql_identifier_to_xml_name("RowType",
3481 54 : get_database_name(MyDatabaseId),
3482 54 : get_namespace_name(reltuple->relnamespace),
3483 54 : NameStr(reltuple->relname));
3484 :
3485 54 : ReleaseSysCache(tuple);
3486 : }
3487 : else
3488 : {
3489 24 : if (tableforest)
3490 12 : xmltn = "row";
3491 : else
3492 12 : xmltn = "table";
3493 :
3494 24 : tabletypename = "TableType";
3495 24 : rowtypename = "RowType";
3496 : }
3497 :
3498 78 : xsd_schema_element_start(&result, targetns);
3499 :
3500 78 : appendStringInfoString(&result,
3501 78 : map_sql_typecoll_to_xmlschema_types(list_make1(tupdesc)));
3502 :
3503 78 : appendStringInfo(&result,
3504 : "<xsd:complexType name=\"%s\">\n"
3505 : " <xsd:sequence>\n",
3506 : rowtypename);
3507 :
3508 324 : for (i = 0; i < tupdesc->natts; i++)
3509 : {
3510 246 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3511 :
3512 246 : if (att->attisdropped)
3513 6 : continue;
3514 480 : appendStringInfo(&result,
3515 : " <xsd:element name=\"%s\" type=\"%s\"%s></xsd:element>\n",
3516 240 : map_sql_identifier_to_xml_name(NameStr(att->attname),
3517 : true, false),
3518 : map_sql_type_to_xml_name(att->atttypid, -1),
3519 : nulls ? " nillable=\"true\"" : " minOccurs=\"0\"");
3520 : }
3521 :
3522 78 : appendStringInfoString(&result,
3523 : " </xsd:sequence>\n"
3524 : "</xsd:complexType>\n\n");
3525 :
3526 78 : if (!tableforest)
3527 : {
3528 42 : appendStringInfo(&result,
3529 : "<xsd:complexType name=\"%s\">\n"
3530 : " <xsd:sequence>\n"
3531 : " <xsd:element name=\"row\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n"
3532 : " </xsd:sequence>\n"
3533 : "</xsd:complexType>\n\n",
3534 : tabletypename, rowtypename);
3535 :
3536 42 : appendStringInfo(&result,
3537 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3538 : xmltn, tabletypename);
3539 : }
3540 : else
3541 36 : appendStringInfo(&result,
3542 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3543 : xmltn, rowtypename);
3544 :
3545 78 : xsd_schema_element_end(&result);
3546 :
3547 78 : return result.data;
3548 : }
3549 :
3550 :
3551 : /*
3552 : * Map an SQL schema to XML Schema data types; see SQL/XML:2008
3553 : * section 9.12.
3554 : */
3555 : static const char *
3556 18 : map_sql_schema_to_xmlschema_types(Oid nspid, List *relid_list, bool nulls,
3557 : bool tableforest, const char *targetns)
3558 : {
3559 : char *dbname;
3560 : char *nspname;
3561 : char *xmlsn;
3562 : char *schematypename;
3563 : StringInfoData result;
3564 : ListCell *cell;
3565 :
3566 18 : dbname = get_database_name(MyDatabaseId);
3567 18 : nspname = get_namespace_name(nspid);
3568 :
3569 18 : initStringInfo(&result);
3570 :
3571 18 : xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
3572 :
3573 18 : schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
3574 : dbname,
3575 : nspname,
3576 : NULL);
3577 :
3578 18 : appendStringInfo(&result,
3579 : "<xsd:complexType name=\"%s\">\n", schematypename);
3580 18 : if (!tableforest)
3581 6 : appendStringInfoString(&result,
3582 : " <xsd:all>\n");
3583 : else
3584 12 : appendStringInfoString(&result,
3585 : " <xsd:sequence>\n");
3586 :
3587 54 : foreach(cell, relid_list)
3588 : {
3589 36 : Oid relid = lfirst_oid(cell);
3590 36 : char *relname = get_rel_name(relid);
3591 36 : char *xmltn = map_sql_identifier_to_xml_name(relname, true, false);
3592 36 : char *tabletypename = map_multipart_sql_identifier_to_xml_name(tableforest ? "RowType" : "TableType",
3593 : dbname,
3594 : nspname,
3595 : relname);
3596 :
3597 36 : if (!tableforest)
3598 12 : appendStringInfo(&result,
3599 : " <xsd:element name=\"%s\" type=\"%s\"/>\n",
3600 : xmltn, tabletypename);
3601 : else
3602 24 : appendStringInfo(&result,
3603 : " <xsd:element name=\"%s\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n",
3604 : xmltn, tabletypename);
3605 : }
3606 :
3607 18 : if (!tableforest)
3608 6 : appendStringInfoString(&result,
3609 : " </xsd:all>\n");
3610 : else
3611 12 : appendStringInfoString(&result,
3612 : " </xsd:sequence>\n");
3613 18 : appendStringInfoString(&result,
3614 : "</xsd:complexType>\n\n");
3615 :
3616 18 : appendStringInfo(&result,
3617 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3618 : xmlsn, schematypename);
3619 :
3620 18 : return result.data;
3621 : }
3622 :
3623 :
3624 : /*
3625 : * Map an SQL catalog to XML Schema data types; see SQL/XML:2008
3626 : * section 9.15.
3627 : */
3628 : static const char *
3629 0 : map_sql_catalog_to_xmlschema_types(List *nspid_list, bool nulls,
3630 : bool tableforest, const char *targetns)
3631 : {
3632 : char *dbname;
3633 : char *xmlcn;
3634 : char *catalogtypename;
3635 : StringInfoData result;
3636 : ListCell *cell;
3637 :
3638 0 : dbname = get_database_name(MyDatabaseId);
3639 :
3640 0 : initStringInfo(&result);
3641 :
3642 0 : xmlcn = map_sql_identifier_to_xml_name(dbname, true, false);
3643 :
3644 0 : catalogtypename = map_multipart_sql_identifier_to_xml_name("CatalogType",
3645 : dbname,
3646 : NULL,
3647 : NULL);
3648 :
3649 0 : appendStringInfo(&result,
3650 : "<xsd:complexType name=\"%s\">\n", catalogtypename);
3651 0 : appendStringInfoString(&result,
3652 : " <xsd:all>\n");
3653 :
3654 0 : foreach(cell, nspid_list)
3655 : {
3656 0 : Oid nspid = lfirst_oid(cell);
3657 0 : char *nspname = get_namespace_name(nspid);
3658 0 : char *xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
3659 0 : char *schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
3660 : dbname,
3661 : nspname,
3662 : NULL);
3663 :
3664 0 : appendStringInfo(&result,
3665 : " <xsd:element name=\"%s\" type=\"%s\"/>\n",
3666 : xmlsn, schematypename);
3667 : }
3668 :
3669 0 : appendStringInfoString(&result,
3670 : " </xsd:all>\n");
3671 0 : appendStringInfoString(&result,
3672 : "</xsd:complexType>\n\n");
3673 :
3674 0 : appendStringInfo(&result,
3675 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3676 : xmlcn, catalogtypename);
3677 :
3678 0 : return result.data;
3679 : }
3680 :
3681 :
3682 : /*
3683 : * Map an SQL data type to an XML name; see SQL/XML:2008 section 9.4.
3684 : */
3685 : static const char *
3686 810 : map_sql_type_to_xml_name(Oid typeoid, int typmod)
3687 : {
3688 : StringInfoData result;
3689 :
3690 810 : initStringInfo(&result);
3691 :
3692 810 : switch (typeoid)
3693 : {
3694 30 : case BPCHAROID:
3695 30 : if (typmod == -1)
3696 30 : appendStringInfoString(&result, "CHAR");
3697 : else
3698 0 : appendStringInfo(&result, "CHAR_%d", typmod - VARHDRSZ);
3699 30 : break;
3700 54 : case VARCHAROID:
3701 54 : if (typmod == -1)
3702 54 : appendStringInfoString(&result, "VARCHAR");
3703 : else
3704 0 : appendStringInfo(&result, "VARCHAR_%d", typmod - VARHDRSZ);
3705 54 : break;
3706 30 : case NUMERICOID:
3707 30 : if (typmod == -1)
3708 30 : appendStringInfoString(&result, "NUMERIC");
3709 : else
3710 0 : appendStringInfo(&result, "NUMERIC_%d_%d",
3711 0 : ((typmod - VARHDRSZ) >> 16) & 0xffff,
3712 0 : (typmod - VARHDRSZ) & 0xffff);
3713 30 : break;
3714 174 : case INT4OID:
3715 174 : appendStringInfoString(&result, "INTEGER");
3716 174 : break;
3717 30 : case INT2OID:
3718 30 : appendStringInfoString(&result, "SMALLINT");
3719 30 : break;
3720 30 : case INT8OID:
3721 30 : appendStringInfoString(&result, "BIGINT");
3722 30 : break;
3723 30 : case FLOAT4OID:
3724 30 : appendStringInfoString(&result, "REAL");
3725 30 : break;
3726 0 : case FLOAT8OID:
3727 0 : appendStringInfoString(&result, "DOUBLE");
3728 0 : break;
3729 30 : case BOOLOID:
3730 30 : appendStringInfoString(&result, "BOOLEAN");
3731 30 : break;
3732 30 : case TIMEOID:
3733 30 : if (typmod == -1)
3734 30 : appendStringInfoString(&result, "TIME");
3735 : else
3736 0 : appendStringInfo(&result, "TIME_%d", typmod);
3737 30 : break;
3738 30 : case TIMETZOID:
3739 30 : if (typmod == -1)
3740 30 : appendStringInfoString(&result, "TIME_WTZ");
3741 : else
3742 0 : appendStringInfo(&result, "TIME_WTZ_%d", typmod);
3743 30 : break;
3744 30 : case TIMESTAMPOID:
3745 30 : if (typmod == -1)
3746 30 : appendStringInfoString(&result, "TIMESTAMP");
3747 : else
3748 0 : appendStringInfo(&result, "TIMESTAMP_%d", typmod);
3749 30 : break;
3750 30 : case TIMESTAMPTZOID:
3751 30 : if (typmod == -1)
3752 30 : appendStringInfoString(&result, "TIMESTAMP_WTZ");
3753 : else
3754 0 : appendStringInfo(&result, "TIMESTAMP_WTZ_%d", typmod);
3755 30 : break;
3756 30 : case DATEOID:
3757 30 : appendStringInfoString(&result, "DATE");
3758 30 : break;
3759 30 : case XMLOID:
3760 30 : appendStringInfoString(&result, "XML");
3761 30 : break;
3762 222 : default:
3763 : {
3764 : HeapTuple tuple;
3765 : Form_pg_type typtuple;
3766 :
3767 222 : tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeoid));
3768 222 : if (!HeapTupleIsValid(tuple))
3769 0 : elog(ERROR, "cache lookup failed for type %u", typeoid);
3770 222 : typtuple = (Form_pg_type) GETSTRUCT(tuple);
3771 :
3772 222 : appendStringInfoString(&result,
3773 222 : map_multipart_sql_identifier_to_xml_name((typtuple->typtype == TYPTYPE_DOMAIN) ? "Domain" : "UDT",
3774 222 : get_database_name(MyDatabaseId),
3775 222 : get_namespace_name(typtuple->typnamespace),
3776 222 : NameStr(typtuple->typname)));
3777 :
3778 222 : ReleaseSysCache(tuple);
3779 : }
3780 : }
3781 :
3782 810 : return result.data;
3783 : }
3784 :
3785 :
3786 : /*
3787 : * Map a collection of SQL data types to XML Schema data types; see
3788 : * SQL/XML:2008 section 9.7.
3789 : */
3790 : static const char *
3791 96 : map_sql_typecoll_to_xmlschema_types(List *tupdesc_list)
3792 : {
3793 96 : List *uniquetypes = NIL;
3794 : int i;
3795 : StringInfoData result;
3796 : ListCell *cell0;
3797 :
3798 : /* extract all column types used in the set of TupleDescs */
3799 210 : foreach(cell0, tupdesc_list)
3800 : {
3801 114 : TupleDesc tupdesc = (TupleDesc) lfirst(cell0);
3802 :
3803 702 : for (i = 0; i < tupdesc->natts; i++)
3804 : {
3805 588 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3806 :
3807 588 : if (att->attisdropped)
3808 24 : continue;
3809 564 : uniquetypes = list_append_unique_oid(uniquetypes, att->atttypid);
3810 : }
3811 : }
3812 :
3813 : /* add base types of domains */
3814 642 : foreach(cell0, uniquetypes)
3815 : {
3816 546 : Oid typid = lfirst_oid(cell0);
3817 546 : Oid basetypid = getBaseType(typid);
3818 :
3819 546 : if (basetypid != typid)
3820 24 : uniquetypes = list_append_unique_oid(uniquetypes, basetypid);
3821 : }
3822 :
3823 : /* Convert to textual form */
3824 96 : initStringInfo(&result);
3825 :
3826 642 : foreach(cell0, uniquetypes)
3827 : {
3828 546 : appendStringInfo(&result, "%s\n",
3829 : map_sql_type_to_xmlschema_type(lfirst_oid(cell0),
3830 : -1));
3831 : }
3832 :
3833 96 : return result.data;
3834 : }
3835 :
3836 :
3837 : /*
3838 : * Map an SQL data type to a named XML Schema data type; see
3839 : * SQL/XML:2008 sections 9.5 and 9.6.
3840 : *
3841 : * (The distinction between 9.5 and 9.6 is basically that 9.6 adds
3842 : * a name attribute, which this function does. The name-less version
3843 : * 9.5 doesn't appear to be required anywhere.)
3844 : */
3845 : static const char *
3846 546 : map_sql_type_to_xmlschema_type(Oid typeoid, int typmod)
3847 : {
3848 : StringInfoData result;
3849 546 : const char *typename = map_sql_type_to_xml_name(typeoid, typmod);
3850 :
3851 546 : initStringInfo(&result);
3852 :
3853 546 : if (typeoid == XMLOID)
3854 : {
3855 24 : appendStringInfoString(&result,
3856 : "<xsd:complexType mixed=\"true\">\n"
3857 : " <xsd:sequence>\n"
3858 : " <xsd:any name=\"element\" minOccurs=\"0\" maxOccurs=\"unbounded\" processContents=\"skip\"/>\n"
3859 : " </xsd:sequence>\n"
3860 : "</xsd:complexType>\n");
3861 : }
3862 : else
3863 : {
3864 522 : appendStringInfo(&result,
3865 : "<xsd:simpleType name=\"%s\">\n", typename);
3866 :
3867 522 : switch (typeoid)
3868 : {
3869 138 : case BPCHAROID:
3870 : case VARCHAROID:
3871 : case TEXTOID:
3872 138 : appendStringInfoString(&result,
3873 : " <xsd:restriction base=\"xsd:string\">\n");
3874 138 : if (typmod != -1)
3875 0 : appendStringInfo(&result,
3876 : " <xsd:maxLength value=\"%d\"/>\n",
3877 : typmod - VARHDRSZ);
3878 138 : appendStringInfoString(&result, " </xsd:restriction>\n");
3879 138 : break;
3880 :
3881 24 : case BYTEAOID:
3882 24 : appendStringInfo(&result,
3883 : " <xsd:restriction base=\"xsd:%s\">\n"
3884 : " </xsd:restriction>\n",
3885 24 : xmlbinary == XMLBINARY_BASE64 ? "base64Binary" : "hexBinary");
3886 24 : break;
3887 :
3888 24 : case NUMERICOID:
3889 24 : if (typmod != -1)
3890 0 : appendStringInfo(&result,
3891 : " <xsd:restriction base=\"xsd:decimal\">\n"
3892 : " <xsd:totalDigits value=\"%d\"/>\n"
3893 : " <xsd:fractionDigits value=\"%d\"/>\n"
3894 : " </xsd:restriction>\n",
3895 0 : ((typmod - VARHDRSZ) >> 16) & 0xffff,
3896 0 : (typmod - VARHDRSZ) & 0xffff);
3897 24 : break;
3898 :
3899 24 : case INT2OID:
3900 24 : appendStringInfo(&result,
3901 : " <xsd:restriction base=\"xsd:short\">\n"
3902 : " <xsd:maxInclusive value=\"%d\"/>\n"
3903 : " <xsd:minInclusive value=\"%d\"/>\n"
3904 : " </xsd:restriction>\n",
3905 : SHRT_MAX, SHRT_MIN);
3906 24 : break;
3907 :
3908 96 : case INT4OID:
3909 96 : appendStringInfo(&result,
3910 : " <xsd:restriction base=\"xsd:int\">\n"
3911 : " <xsd:maxInclusive value=\"%d\"/>\n"
3912 : " <xsd:minInclusive value=\"%d\"/>\n"
3913 : " </xsd:restriction>\n",
3914 : INT_MAX, INT_MIN);
3915 96 : break;
3916 :
3917 24 : case INT8OID:
3918 24 : appendStringInfo(&result,
3919 : " <xsd:restriction base=\"xsd:long\">\n"
3920 : " <xsd:maxInclusive value=\"" INT64_FORMAT "\"/>\n"
3921 : " <xsd:minInclusive value=\"" INT64_FORMAT "\"/>\n"
3922 : " </xsd:restriction>\n",
3923 : PG_INT64_MAX,
3924 : PG_INT64_MIN);
3925 24 : break;
3926 :
3927 24 : case FLOAT4OID:
3928 24 : appendStringInfoString(&result,
3929 : " <xsd:restriction base=\"xsd:float\"></xsd:restriction>\n");
3930 24 : break;
3931 :
3932 0 : case FLOAT8OID:
3933 0 : appendStringInfoString(&result,
3934 : " <xsd:restriction base=\"xsd:double\"></xsd:restriction>\n");
3935 0 : break;
3936 :
3937 24 : case BOOLOID:
3938 24 : appendStringInfoString(&result,
3939 : " <xsd:restriction base=\"xsd:boolean\"></xsd:restriction>\n");
3940 24 : break;
3941 :
3942 48 : case TIMEOID:
3943 : case TIMETZOID:
3944 : {
3945 48 : const char *tz = (typeoid == TIMETZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
3946 :
3947 48 : if (typmod == -1)
3948 48 : appendStringInfo(&result,
3949 : " <xsd:restriction base=\"xsd:time\">\n"
3950 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
3951 : " </xsd:restriction>\n", tz);
3952 0 : else if (typmod == 0)
3953 0 : appendStringInfo(&result,
3954 : " <xsd:restriction base=\"xsd:time\">\n"
3955 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
3956 : " </xsd:restriction>\n", tz);
3957 : else
3958 0 : appendStringInfo(&result,
3959 : " <xsd:restriction base=\"xsd:time\">\n"
3960 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
3961 : " </xsd:restriction>\n", typmod - VARHDRSZ, tz);
3962 48 : break;
3963 : }
3964 :
3965 48 : case TIMESTAMPOID:
3966 : case TIMESTAMPTZOID:
3967 : {
3968 48 : const char *tz = (typeoid == TIMESTAMPTZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
3969 :
3970 48 : if (typmod == -1)
3971 48 : appendStringInfo(&result,
3972 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3973 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
3974 : " </xsd:restriction>\n", tz);
3975 0 : else if (typmod == 0)
3976 0 : appendStringInfo(&result,
3977 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3978 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
3979 : " </xsd:restriction>\n", tz);
3980 : else
3981 0 : appendStringInfo(&result,
3982 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3983 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
3984 : " </xsd:restriction>\n", typmod - VARHDRSZ, tz);
3985 48 : break;
3986 : }
3987 :
3988 24 : case DATEOID:
3989 24 : appendStringInfoString(&result,
3990 : " <xsd:restriction base=\"xsd:date\">\n"
3991 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}\"/>\n"
3992 : " </xsd:restriction>\n");
3993 24 : break;
3994 :
3995 24 : default:
3996 24 : if (get_typtype(typeoid) == TYPTYPE_DOMAIN)
3997 : {
3998 : Oid base_typeoid;
3999 24 : int32 base_typmod = -1;
4000 :
4001 24 : base_typeoid = getBaseTypeAndTypmod(typeoid, &base_typmod);
4002 :
4003 24 : appendStringInfo(&result,
4004 : " <xsd:restriction base=\"%s\"/>\n",
4005 : map_sql_type_to_xml_name(base_typeoid, base_typmod));
4006 : }
4007 24 : break;
4008 : }
4009 522 : appendStringInfoString(&result, "</xsd:simpleType>\n");
4010 : }
4011 :
4012 546 : return result.data;
4013 : }
4014 :
4015 :
4016 : /*
4017 : * Map an SQL row to an XML element, taking the row from the active
4018 : * SPI cursor. See also SQL/XML:2008 section 9.10.
4019 : */
4020 : static void
4021 312 : SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result, char *tablename,
4022 : bool nulls, bool tableforest,
4023 : const char *targetns, bool top_level)
4024 : {
4025 : int i;
4026 : char *xmltn;
4027 :
4028 312 : if (tablename)
4029 228 : xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
4030 : else
4031 : {
4032 84 : if (tableforest)
4033 36 : xmltn = "row";
4034 : else
4035 48 : xmltn = "table";
4036 : }
4037 :
4038 312 : if (tableforest)
4039 162 : xmldata_root_element_start(result, xmltn, NULL, targetns, top_level);
4040 : else
4041 150 : appendStringInfoString(result, "<row>\n");
4042 :
4043 1272 : for (i = 1; i <= SPI_tuptable->tupdesc->natts; i++)
4044 : {
4045 : char *colname;
4046 : Datum colval;
4047 : bool isnull;
4048 :
4049 960 : colname = map_sql_identifier_to_xml_name(SPI_fname(SPI_tuptable->tupdesc, i),
4050 : true, false);
4051 960 : colval = SPI_getbinval(SPI_tuptable->vals[rownum],
4052 960 : SPI_tuptable->tupdesc,
4053 : i,
4054 : &isnull);
4055 960 : if (isnull)
4056 : {
4057 114 : if (nulls)
4058 60 : appendStringInfo(result, " <%s xsi:nil=\"true\"/>\n", colname);
4059 : }
4060 : else
4061 846 : appendStringInfo(result, " <%s>%s</%s>\n",
4062 : colname,
4063 : map_sql_value_to_xml_value(colval,
4064 846 : SPI_gettypeid(SPI_tuptable->tupdesc, i), true),
4065 : colname);
4066 : }
4067 :
4068 312 : if (tableforest)
4069 : {
4070 162 : xmldata_root_element_end(result, xmltn);
4071 162 : appendStringInfoChar(result, '\n');
4072 : }
4073 : else
4074 150 : appendStringInfoString(result, "</row>\n\n");
4075 312 : }
4076 :
4077 :
4078 : /*
4079 : * XPath related functions
4080 : */
4081 :
4082 : #ifdef USE_LIBXML
4083 :
4084 : /*
4085 : * Convert XML node to text.
4086 : *
4087 : * For attribute and text nodes, return the escaped text. For anything else,
4088 : * dump the whole subtree.
4089 : */
4090 : static text *
4091 192 : xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt)
4092 : {
4093 192 : xmltype *result = NULL;
4094 :
4095 192 : if (cur->type != XML_ATTRIBUTE_NODE && cur->type != XML_TEXT_NODE)
4096 162 : {
4097 162 : void (*volatile nodefree) (xmlNodePtr) = NULL;
4098 162 : volatile xmlBufferPtr buf = NULL;
4099 162 : volatile xmlNodePtr cur_copy = NULL;
4100 :
4101 162 : PG_TRY();
4102 : {
4103 : int bytes;
4104 :
4105 162 : buf = xmlBufferCreate();
4106 162 : if (buf == NULL || xmlerrcxt->err_occurred)
4107 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4108 : "could not allocate xmlBuffer");
4109 :
4110 : /*
4111 : * Produce a dump of the node that we can serialize. xmlNodeDump
4112 : * does that, but the result of that function won't contain
4113 : * namespace definitions from ancestor nodes, so we first do a
4114 : * xmlCopyNode() which duplicates the node along with its required
4115 : * namespace definitions.
4116 : *
4117 : * Some old libxml2 versions such as 2.7.6 produce partially
4118 : * broken XML_DOCUMENT_NODE nodes (unset content field) when
4119 : * copying them. xmlNodeDump of such a node works fine, but
4120 : * xmlFreeNode crashes; set us up to call xmlFreeDoc instead.
4121 : */
4122 162 : cur_copy = xmlCopyNode(cur, 1);
4123 162 : if (cur_copy == NULL || xmlerrcxt->err_occurred)
4124 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4125 : "could not copy node");
4126 324 : nodefree = (cur_copy->type == XML_DOCUMENT_NODE) ?
4127 162 : (void (*) (xmlNodePtr)) xmlFreeDoc : xmlFreeNode;
4128 :
4129 162 : bytes = xmlNodeDump(buf, NULL, cur_copy, 0, 0);
4130 162 : if (bytes == -1 || xmlerrcxt->err_occurred)
4131 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4132 : "could not dump node");
4133 :
4134 162 : result = xmlBuffer_to_xmltype(buf);
4135 : }
4136 0 : PG_FINALLY();
4137 : {
4138 162 : if (nodefree)
4139 162 : nodefree(cur_copy);
4140 162 : if (buf)
4141 162 : xmlBufferFree(buf);
4142 : }
4143 162 : PG_END_TRY();
4144 : }
4145 : else
4146 : {
4147 : xmlChar *str;
4148 :
4149 30 : str = xmlXPathCastNodeToString(cur);
4150 30 : PG_TRY();
4151 : {
4152 : /* Here we rely on XML having the same representation as TEXT */
4153 30 : char *escaped = escape_xml((char *) str);
4154 :
4155 30 : result = (xmltype *) cstring_to_text(escaped);
4156 30 : pfree(escaped);
4157 : }
4158 0 : PG_FINALLY();
4159 : {
4160 30 : xmlFree(str);
4161 : }
4162 30 : PG_END_TRY();
4163 : }
4164 :
4165 192 : return result;
4166 : }
4167 :
4168 : /*
4169 : * Convert an XML XPath object (the result of evaluating an XPath expression)
4170 : * to an array of xml values, which are appended to astate. The function
4171 : * result value is the number of elements in the array.
4172 : *
4173 : * If "astate" is NULL then we don't generate the array value, but we still
4174 : * return the number of elements it would have had.
4175 : *
4176 : * Nodesets are converted to an array containing the nodes' textual
4177 : * representations. Primitive values (float, double, string) are converted
4178 : * to a single-element array containing the value's string representation.
4179 : */
4180 : static int
4181 540 : xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
4182 : ArrayBuildState *astate,
4183 : PgXmlErrorContext *xmlerrcxt)
4184 : {
4185 540 : int result = 0;
4186 : Datum datum;
4187 : Oid datumtype;
4188 : char *result_str;
4189 :
4190 540 : switch (xpathobj->type)
4191 : {
4192 498 : case XPATH_NODESET:
4193 498 : if (xpathobj->nodesetval != NULL)
4194 : {
4195 354 : result = xpathobj->nodesetval->nodeNr;
4196 354 : if (astate != NULL)
4197 : {
4198 : int i;
4199 :
4200 168 : for (i = 0; i < result; i++)
4201 : {
4202 90 : datum = PointerGetDatum(xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
4203 : xmlerrcxt));
4204 90 : (void) accumArrayResult(astate, datum, false,
4205 : XMLOID, CurrentMemoryContext);
4206 : }
4207 : }
4208 : }
4209 498 : return result;
4210 :
4211 12 : case XPATH_BOOLEAN:
4212 12 : if (astate == NULL)
4213 0 : return 1;
4214 12 : datum = BoolGetDatum(xpathobj->boolval);
4215 12 : datumtype = BOOLOID;
4216 12 : break;
4217 :
4218 18 : case XPATH_NUMBER:
4219 18 : if (astate == NULL)
4220 12 : return 1;
4221 6 : datum = Float8GetDatum(xpathobj->floatval);
4222 6 : datumtype = FLOAT8OID;
4223 6 : break;
4224 :
4225 12 : case XPATH_STRING:
4226 12 : if (astate == NULL)
4227 0 : return 1;
4228 12 : datum = CStringGetDatum((char *) xpathobj->stringval);
4229 12 : datumtype = CSTRINGOID;
4230 12 : break;
4231 :
4232 0 : default:
4233 0 : elog(ERROR, "xpath expression result type %d is unsupported",
4234 : xpathobj->type);
4235 : return 0; /* keep compiler quiet */
4236 : }
4237 :
4238 : /* Common code for scalar-value cases */
4239 30 : result_str = map_sql_value_to_xml_value(datum, datumtype, true);
4240 30 : datum = PointerGetDatum(cstring_to_xmltype(result_str));
4241 30 : (void) accumArrayResult(astate, datum, false,
4242 : XMLOID, CurrentMemoryContext);
4243 30 : return 1;
4244 : }
4245 :
4246 :
4247 : /*
4248 : * Common code for xpath() and xmlexists()
4249 : *
4250 : * Evaluate XPath expression and return number of nodes in res_nitems
4251 : * and array of XML values in astate. Either of those pointers can be
4252 : * NULL if the corresponding result isn't wanted.
4253 : *
4254 : * It is up to the user to ensure that the XML passed is in fact
4255 : * an XML document - XPath doesn't work easily on fragments without
4256 : * a context node being known.
4257 : */
4258 : static void
4259 558 : xpath_internal(text *xpath_expr_text, xmltype *data, ArrayType *namespaces,
4260 : int *res_nitems, ArrayBuildState *astate)
4261 : {
4262 : PgXmlErrorContext *xmlerrcxt;
4263 558 : volatile xmlParserCtxtPtr ctxt = NULL;
4264 558 : volatile xmlDocPtr doc = NULL;
4265 558 : volatile xmlXPathContextPtr xpathctx = NULL;
4266 558 : volatile xmlXPathCompExprPtr xpathcomp = NULL;
4267 558 : volatile xmlXPathObjectPtr xpathobj = NULL;
4268 : char *datastr;
4269 : int32 len;
4270 : int32 xpath_len;
4271 : xmlChar *string;
4272 : xmlChar *xpath_expr;
4273 558 : size_t xmldecl_len = 0;
4274 : int i;
4275 : int ndim;
4276 : Datum *ns_names_uris;
4277 : bool *ns_names_uris_nulls;
4278 : int ns_count;
4279 :
4280 : /*
4281 : * Namespace mappings are passed as text[]. If an empty array is passed
4282 : * (ndim = 0, "0-dimensional"), then there are no namespace mappings.
4283 : * Else, a 2-dimensional array with length of the second axis being equal
4284 : * to 2 should be passed, i.e., every subarray contains 2 elements, the
4285 : * first element defining the name, the second one the URI. Example:
4286 : * ARRAY[ARRAY['myns', 'http://example.com'], ARRAY['myns2',
4287 : * 'http://example2.com']].
4288 : */
4289 558 : ndim = namespaces ? ARR_NDIM(namespaces) : 0;
4290 558 : if (ndim != 0)
4291 : {
4292 : int *dims;
4293 :
4294 126 : dims = ARR_DIMS(namespaces);
4295 :
4296 126 : if (ndim != 2 || dims[1] != 2)
4297 0 : ereport(ERROR,
4298 : (errcode(ERRCODE_DATA_EXCEPTION),
4299 : errmsg("invalid array for XML namespace mapping"),
4300 : errdetail("The array must be two-dimensional with length of the second axis equal to 2.")));
4301 :
4302 : Assert(ARR_ELEMTYPE(namespaces) == TEXTOID);
4303 :
4304 126 : deconstruct_array_builtin(namespaces, TEXTOID,
4305 : &ns_names_uris, &ns_names_uris_nulls,
4306 : &ns_count);
4307 :
4308 : Assert((ns_count % 2) == 0); /* checked above */
4309 126 : ns_count /= 2; /* count pairs only */
4310 : }
4311 : else
4312 : {
4313 432 : ns_names_uris = NULL;
4314 432 : ns_names_uris_nulls = NULL;
4315 432 : ns_count = 0;
4316 : }
4317 :
4318 558 : datastr = VARDATA(data);
4319 558 : len = VARSIZE(data) - VARHDRSZ;
4320 558 : xpath_len = VARSIZE_ANY_EXHDR(xpath_expr_text);
4321 558 : if (xpath_len == 0)
4322 6 : ereport(ERROR,
4323 : (errcode(ERRCODE_DATA_EXCEPTION),
4324 : errmsg("empty XPath expression")));
4325 :
4326 552 : string = pg_xmlCharStrndup(datastr, len);
4327 552 : xpath_expr = pg_xmlCharStrndup(VARDATA_ANY(xpath_expr_text), xpath_len);
4328 :
4329 : /*
4330 : * In a UTF8 database, skip any xml declaration, which might assert
4331 : * another encoding. Ignore parse_xml_decl() failure, letting
4332 : * xmlCtxtReadMemory() report parse errors. Documentation disclaims
4333 : * xpath() support for non-ASCII data in non-UTF8 databases, so leave
4334 : * those scenarios bug-compatible with historical behavior.
4335 : */
4336 552 : if (GetDatabaseEncoding() == PG_UTF8)
4337 552 : parse_xml_decl(string, &xmldecl_len, NULL, NULL, NULL);
4338 :
4339 552 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
4340 :
4341 552 : PG_TRY();
4342 : {
4343 552 : xmlInitParser();
4344 :
4345 : /*
4346 : * redundant XML parsing (two parsings for the same value during one
4347 : * command execution are possible)
4348 : */
4349 552 : ctxt = xmlNewParserCtxt();
4350 552 : if (ctxt == NULL || xmlerrcxt->err_occurred)
4351 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4352 : "could not allocate parser context");
4353 1104 : doc = xmlCtxtReadMemory(ctxt, (char *) string + xmldecl_len,
4354 552 : len - xmldecl_len, NULL, NULL, 0);
4355 552 : if (doc == NULL || xmlerrcxt->err_occurred)
4356 12 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
4357 : "could not parse XML document");
4358 540 : xpathctx = xmlXPathNewContext(doc);
4359 540 : if (xpathctx == NULL || xmlerrcxt->err_occurred)
4360 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4361 : "could not allocate XPath context");
4362 540 : xpathctx->node = (xmlNodePtr) doc;
4363 :
4364 : /* register namespaces, if any */
4365 540 : if (ns_count > 0)
4366 : {
4367 252 : for (i = 0; i < ns_count; i++)
4368 : {
4369 : char *ns_name;
4370 : char *ns_uri;
4371 :
4372 126 : if (ns_names_uris_nulls[i * 2] ||
4373 126 : ns_names_uris_nulls[i * 2 + 1])
4374 0 : ereport(ERROR,
4375 : (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
4376 : errmsg("neither namespace name nor URI may be null")));
4377 126 : ns_name = TextDatumGetCString(ns_names_uris[i * 2]);
4378 126 : ns_uri = TextDatumGetCString(ns_names_uris[i * 2 + 1]);
4379 126 : if (xmlXPathRegisterNs(xpathctx,
4380 : (xmlChar *) ns_name,
4381 : (xmlChar *) ns_uri) != 0)
4382 0 : ereport(ERROR, /* is this an internal error??? */
4383 : (errmsg("could not register XML namespace with name \"%s\" and URI \"%s\"",
4384 : ns_name, ns_uri)));
4385 : }
4386 : }
4387 :
4388 540 : xpathcomp = xmlXPathCompile(xpath_expr);
4389 540 : if (xpathcomp == NULL || xmlerrcxt->err_occurred)
4390 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4391 : "invalid XPath expression");
4392 :
4393 : /*
4394 : * Version 2.6.27 introduces a function named
4395 : * xmlXPathCompiledEvalToBoolean, which would be enough for xmlexists,
4396 : * but we can derive the existence by whether any nodes are returned,
4397 : * thereby preventing a library version upgrade and keeping the code
4398 : * the same.
4399 : */
4400 540 : xpathobj = xmlXPathCompiledEval(xpathcomp, xpathctx);
4401 540 : if (xpathobj == NULL || xmlerrcxt->err_occurred)
4402 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4403 : "could not create XPath object");
4404 :
4405 : /*
4406 : * Extract the results as requested.
4407 : */
4408 540 : if (res_nitems != NULL)
4409 432 : *res_nitems = xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
4410 : else
4411 108 : (void) xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
4412 : }
4413 12 : PG_CATCH();
4414 : {
4415 12 : if (xpathobj)
4416 0 : xmlXPathFreeObject(xpathobj);
4417 12 : if (xpathcomp)
4418 0 : xmlXPathFreeCompExpr(xpathcomp);
4419 12 : if (xpathctx)
4420 0 : xmlXPathFreeContext(xpathctx);
4421 12 : if (doc)
4422 12 : xmlFreeDoc(doc);
4423 12 : if (ctxt)
4424 12 : xmlFreeParserCtxt(ctxt);
4425 :
4426 12 : pg_xml_done(xmlerrcxt, true);
4427 :
4428 12 : PG_RE_THROW();
4429 : }
4430 540 : PG_END_TRY();
4431 :
4432 540 : xmlXPathFreeObject(xpathobj);
4433 540 : xmlXPathFreeCompExpr(xpathcomp);
4434 540 : xmlXPathFreeContext(xpathctx);
4435 540 : xmlFreeDoc(doc);
4436 540 : xmlFreeParserCtxt(ctxt);
4437 :
4438 540 : pg_xml_done(xmlerrcxt, false);
4439 540 : }
4440 : #endif /* USE_LIBXML */
4441 :
4442 : /*
4443 : * Evaluate XPath expression and return array of XML values.
4444 : *
4445 : * As we have no support of XQuery sequences yet, this function seems
4446 : * to be the most useful one (array of XML functions plays a role of
4447 : * some kind of substitution for XQuery sequences).
4448 : */
4449 : Datum
4450 126 : xpath(PG_FUNCTION_ARGS)
4451 : {
4452 : #ifdef USE_LIBXML
4453 126 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4454 126 : xmltype *data = PG_GETARG_XML_P(1);
4455 126 : ArrayType *namespaces = PG_GETARG_ARRAYTYPE_P(2);
4456 : ArrayBuildState *astate;
4457 :
4458 126 : astate = initArrayResult(XMLOID, CurrentMemoryContext, true);
4459 126 : xpath_internal(xpath_expr_text, data, namespaces,
4460 : NULL, astate);
4461 108 : PG_RETURN_DATUM(makeArrayResult(astate, CurrentMemoryContext));
4462 : #else
4463 : NO_XML_SUPPORT();
4464 : return 0;
4465 : #endif
4466 : }
4467 :
4468 : /*
4469 : * Determines if the node specified by the supplied XPath exists
4470 : * in a given XML document, returning a boolean.
4471 : */
4472 : Datum
4473 198 : xmlexists(PG_FUNCTION_ARGS)
4474 : {
4475 : #ifdef USE_LIBXML
4476 198 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4477 198 : xmltype *data = PG_GETARG_XML_P(1);
4478 : int res_nitems;
4479 :
4480 198 : xpath_internal(xpath_expr_text, data, NULL,
4481 : &res_nitems, NULL);
4482 :
4483 198 : PG_RETURN_BOOL(res_nitems > 0);
4484 : #else
4485 : NO_XML_SUPPORT();
4486 : return 0;
4487 : #endif
4488 : }
4489 :
4490 : /*
4491 : * Determines if the node specified by the supplied XPath exists
4492 : * in a given XML document, returning a boolean. Differs from
4493 : * xmlexists as it supports namespaces and is not defined in SQL/XML.
4494 : */
4495 : Datum
4496 234 : xpath_exists(PG_FUNCTION_ARGS)
4497 : {
4498 : #ifdef USE_LIBXML
4499 234 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4500 234 : xmltype *data = PG_GETARG_XML_P(1);
4501 234 : ArrayType *namespaces = PG_GETARG_ARRAYTYPE_P(2);
4502 : int res_nitems;
4503 :
4504 234 : xpath_internal(xpath_expr_text, data, namespaces,
4505 : &res_nitems, NULL);
4506 :
4507 234 : PG_RETURN_BOOL(res_nitems > 0);
4508 : #else
4509 : NO_XML_SUPPORT();
4510 : return 0;
4511 : #endif
4512 : }
4513 :
4514 : /*
4515 : * Functions for checking well-formed-ness
4516 : */
4517 :
4518 : #ifdef USE_LIBXML
4519 : static bool
4520 114 : wellformed_xml(text *data, XmlOptionType xmloption_arg)
4521 : {
4522 : xmlDocPtr doc;
4523 114 : ErrorSaveContext escontext = {T_ErrorSaveContext};
4524 :
4525 : /*
4526 : * We'll report "true" if no soft error is reported by xml_parse().
4527 : */
4528 114 : doc = xml_parse(data, xmloption_arg, true,
4529 : GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
4530 114 : if (doc)
4531 60 : xmlFreeDoc(doc);
4532 :
4533 114 : return !escontext.error_occurred;
4534 : }
4535 : #endif
4536 :
4537 : Datum
4538 90 : xml_is_well_formed(PG_FUNCTION_ARGS)
4539 : {
4540 : #ifdef USE_LIBXML
4541 90 : text *data = PG_GETARG_TEXT_PP(0);
4542 :
4543 90 : PG_RETURN_BOOL(wellformed_xml(data, xmloption));
4544 : #else
4545 : NO_XML_SUPPORT();
4546 : return 0;
4547 : #endif /* not USE_LIBXML */
4548 : }
4549 :
4550 : Datum
4551 12 : xml_is_well_formed_document(PG_FUNCTION_ARGS)
4552 : {
4553 : #ifdef USE_LIBXML
4554 12 : text *data = PG_GETARG_TEXT_PP(0);
4555 :
4556 12 : PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_DOCUMENT));
4557 : #else
4558 : NO_XML_SUPPORT();
4559 : return 0;
4560 : #endif /* not USE_LIBXML */
4561 : }
4562 :
4563 : Datum
4564 12 : xml_is_well_formed_content(PG_FUNCTION_ARGS)
4565 : {
4566 : #ifdef USE_LIBXML
4567 12 : text *data = PG_GETARG_TEXT_PP(0);
4568 :
4569 12 : PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_CONTENT));
4570 : #else
4571 : NO_XML_SUPPORT();
4572 : return 0;
4573 : #endif /* not USE_LIBXML */
4574 : }
4575 :
4576 : /*
4577 : * support functions for XMLTABLE
4578 : *
4579 : */
4580 : #ifdef USE_LIBXML
4581 :
4582 : /*
4583 : * Returns private data from executor state. Ensure validity by check with
4584 : * MAGIC number.
4585 : */
4586 : static inline XmlTableBuilderData *
4587 156616 : GetXmlTableBuilderPrivateData(TableFuncScanState *state, const char *fname)
4588 : {
4589 : XmlTableBuilderData *result;
4590 :
4591 156616 : if (!IsA(state, TableFuncScanState))
4592 0 : elog(ERROR, "%s called with invalid TableFuncScanState", fname);
4593 156616 : result = (XmlTableBuilderData *) state->opaque;
4594 156616 : if (result->magic != XMLTABLE_CONTEXT_MAGIC)
4595 0 : elog(ERROR, "%s called with invalid TableFuncScanState", fname);
4596 :
4597 156616 : return result;
4598 : }
4599 : #endif
4600 :
4601 : /*
4602 : * XmlTableInitOpaque
4603 : * Fill in TableFuncScanState->opaque for XmlTable processor; initialize
4604 : * the XML parser.
4605 : *
4606 : * Note: Because we call pg_xml_init() here and pg_xml_done() in
4607 : * XmlTableDestroyOpaque, it is critical for robustness that no other
4608 : * executor nodes run until this node is processed to completion. Caller
4609 : * must execute this to completion (probably filling a tuplestore to exhaust
4610 : * this node in a single pass) instead of using row-per-call mode.
4611 : */
4612 : static void
4613 264 : XmlTableInitOpaque(TableFuncScanState *state, int natts)
4614 : {
4615 : #ifdef USE_LIBXML
4616 264 : volatile xmlParserCtxtPtr ctxt = NULL;
4617 : XmlTableBuilderData *xtCxt;
4618 : PgXmlErrorContext *xmlerrcxt;
4619 :
4620 264 : xtCxt = palloc0(sizeof(XmlTableBuilderData));
4621 264 : xtCxt->magic = XMLTABLE_CONTEXT_MAGIC;
4622 264 : xtCxt->natts = natts;
4623 264 : xtCxt->xpathscomp = palloc0(sizeof(xmlXPathCompExprPtr) * natts);
4624 :
4625 264 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
4626 :
4627 264 : PG_TRY();
4628 : {
4629 264 : xmlInitParser();
4630 :
4631 264 : ctxt = xmlNewParserCtxt();
4632 264 : if (ctxt == NULL || xmlerrcxt->err_occurred)
4633 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4634 : "could not allocate parser context");
4635 : }
4636 0 : PG_CATCH();
4637 : {
4638 0 : if (ctxt != NULL)
4639 0 : xmlFreeParserCtxt(ctxt);
4640 :
4641 0 : pg_xml_done(xmlerrcxt, true);
4642 :
4643 0 : PG_RE_THROW();
4644 : }
4645 264 : PG_END_TRY();
4646 :
4647 264 : xtCxt->xmlerrcxt = xmlerrcxt;
4648 264 : xtCxt->ctxt = ctxt;
4649 :
4650 264 : state->opaque = xtCxt;
4651 : #else
4652 : NO_XML_SUPPORT();
4653 : #endif /* not USE_LIBXML */
4654 264 : }
4655 :
4656 : /*
4657 : * XmlTableSetDocument
4658 : * Install the input document
4659 : */
4660 : static void
4661 264 : XmlTableSetDocument(TableFuncScanState *state, Datum value)
4662 : {
4663 : #ifdef USE_LIBXML
4664 : XmlTableBuilderData *xtCxt;
4665 264 : xmltype *xmlval = DatumGetXmlP(value);
4666 : char *str;
4667 : xmlChar *xstr;
4668 : int length;
4669 264 : volatile xmlDocPtr doc = NULL;
4670 264 : volatile xmlXPathContextPtr xpathcxt = NULL;
4671 :
4672 264 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetDocument");
4673 :
4674 : /*
4675 : * Use out function for casting to string (remove encoding property). See
4676 : * comment in xml_out.
4677 : */
4678 264 : str = xml_out_internal(xmlval, 0);
4679 :
4680 264 : length = strlen(str);
4681 264 : xstr = pg_xmlCharStrndup(str, length);
4682 :
4683 264 : PG_TRY();
4684 : {
4685 264 : doc = xmlCtxtReadMemory(xtCxt->ctxt, (char *) xstr, length, NULL, NULL, 0);
4686 264 : if (doc == NULL || xtCxt->xmlerrcxt->err_occurred)
4687 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
4688 : "could not parse XML document");
4689 264 : xpathcxt = xmlXPathNewContext(doc);
4690 264 : if (xpathcxt == NULL || xtCxt->xmlerrcxt->err_occurred)
4691 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4692 : "could not allocate XPath context");
4693 264 : xpathcxt->node = (xmlNodePtr) doc;
4694 : }
4695 0 : PG_CATCH();
4696 : {
4697 0 : if (xpathcxt != NULL)
4698 0 : xmlXPathFreeContext(xpathcxt);
4699 0 : if (doc != NULL)
4700 0 : xmlFreeDoc(doc);
4701 :
4702 0 : PG_RE_THROW();
4703 : }
4704 264 : PG_END_TRY();
4705 :
4706 264 : xtCxt->doc = doc;
4707 264 : xtCxt->xpathcxt = xpathcxt;
4708 : #else
4709 : NO_XML_SUPPORT();
4710 : #endif /* not USE_LIBXML */
4711 264 : }
4712 :
4713 : /*
4714 : * XmlTableSetNamespace
4715 : * Add a namespace declaration
4716 : */
4717 : static void
4718 18 : XmlTableSetNamespace(TableFuncScanState *state, const char *name, const char *uri)
4719 : {
4720 : #ifdef USE_LIBXML
4721 : XmlTableBuilderData *xtCxt;
4722 :
4723 18 : if (name == NULL)
4724 6 : ereport(ERROR,
4725 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4726 : errmsg("DEFAULT namespace is not supported")));
4727 12 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetNamespace");
4728 :
4729 12 : if (xmlXPathRegisterNs(xtCxt->xpathcxt,
4730 12 : pg_xmlCharStrndup(name, strlen(name)),
4731 12 : pg_xmlCharStrndup(uri, strlen(uri))))
4732 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
4733 : "could not set XML namespace");
4734 : #else
4735 : NO_XML_SUPPORT();
4736 : #endif /* not USE_LIBXML */
4737 12 : }
4738 :
4739 : /*
4740 : * XmlTableSetRowFilter
4741 : * Install the row-filter Xpath expression.
4742 : */
4743 : static void
4744 258 : XmlTableSetRowFilter(TableFuncScanState *state, const char *path)
4745 : {
4746 : #ifdef USE_LIBXML
4747 : XmlTableBuilderData *xtCxt;
4748 : xmlChar *xstr;
4749 :
4750 258 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetRowFilter");
4751 :
4752 258 : if (*path == '\0')
4753 0 : ereport(ERROR,
4754 : (errcode(ERRCODE_DATA_EXCEPTION),
4755 : errmsg("row path filter must not be empty string")));
4756 :
4757 258 : xstr = pg_xmlCharStrndup(path, strlen(path));
4758 :
4759 258 : xtCxt->xpathcomp = xmlXPathCompile(xstr);
4760 258 : if (xtCxt->xpathcomp == NULL || xtCxt->xmlerrcxt->err_occurred)
4761 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_SYNTAX_ERROR,
4762 : "invalid XPath expression");
4763 : #else
4764 : NO_XML_SUPPORT();
4765 : #endif /* not USE_LIBXML */
4766 258 : }
4767 :
4768 : /*
4769 : * XmlTableSetColumnFilter
4770 : * Install the column-filter Xpath expression, for the given column.
4771 : */
4772 : static void
4773 774 : XmlTableSetColumnFilter(TableFuncScanState *state, const char *path, int colnum)
4774 : {
4775 : #ifdef USE_LIBXML
4776 : XmlTableBuilderData *xtCxt;
4777 : xmlChar *xstr;
4778 :
4779 : Assert(PointerIsValid(path));
4780 :
4781 774 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetColumnFilter");
4782 :
4783 774 : if (*path == '\0')
4784 0 : ereport(ERROR,
4785 : (errcode(ERRCODE_DATA_EXCEPTION),
4786 : errmsg("column path filter must not be empty string")));
4787 :
4788 774 : xstr = pg_xmlCharStrndup(path, strlen(path));
4789 :
4790 774 : xtCxt->xpathscomp[colnum] = xmlXPathCompile(xstr);
4791 774 : if (xtCxt->xpathscomp[colnum] == NULL || xtCxt->xmlerrcxt->err_occurred)
4792 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
4793 : "invalid XPath expression");
4794 : #else
4795 : NO_XML_SUPPORT();
4796 : #endif /* not USE_LIBXML */
4797 774 : }
4798 :
4799 : /*
4800 : * XmlTableFetchRow
4801 : * Prepare the next "current" tuple for upcoming GetValue calls.
4802 : * Returns false if the row-filter expression returned no more rows.
4803 : */
4804 : static bool
4805 22510 : XmlTableFetchRow(TableFuncScanState *state)
4806 : {
4807 : #ifdef USE_LIBXML
4808 : XmlTableBuilderData *xtCxt;
4809 :
4810 22510 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableFetchRow");
4811 :
4812 : /* Propagate our own error context to libxml2 */
4813 22510 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
4814 :
4815 22510 : if (xtCxt->xpathobj == NULL)
4816 : {
4817 258 : xtCxt->xpathobj = xmlXPathCompiledEval(xtCxt->xpathcomp, xtCxt->xpathcxt);
4818 258 : if (xtCxt->xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
4819 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4820 : "could not create XPath object");
4821 :
4822 258 : xtCxt->row_count = 0;
4823 : }
4824 :
4825 22510 : if (xtCxt->xpathobj->type == XPATH_NODESET)
4826 : {
4827 22510 : if (xtCxt->xpathobj->nodesetval != NULL)
4828 : {
4829 22510 : if (xtCxt->row_count++ < xtCxt->xpathobj->nodesetval->nodeNr)
4830 22264 : return true;
4831 : }
4832 : }
4833 :
4834 246 : return false;
4835 : #else
4836 : NO_XML_SUPPORT();
4837 : return false;
4838 : #endif /* not USE_LIBXML */
4839 : }
4840 :
4841 : /*
4842 : * XmlTableGetValue
4843 : * Return the value for column number 'colnum' for the current row. If
4844 : * column -1 is requested, return representation of the whole row.
4845 : *
4846 : * This leaks memory, so be sure to reset often the context in which it's
4847 : * called.
4848 : */
4849 : static Datum
4850 132534 : XmlTableGetValue(TableFuncScanState *state, int colnum,
4851 : Oid typid, int32 typmod, bool *isnull)
4852 : {
4853 : #ifdef USE_LIBXML
4854 : XmlTableBuilderData *xtCxt;
4855 132534 : Datum result = (Datum) 0;
4856 : xmlNodePtr cur;
4857 132534 : char *cstr = NULL;
4858 132534 : volatile xmlXPathObjectPtr xpathobj = NULL;
4859 :
4860 132534 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableGetValue");
4861 :
4862 : Assert(xtCxt->xpathobj &&
4863 : xtCxt->xpathobj->type == XPATH_NODESET &&
4864 : xtCxt->xpathobj->nodesetval != NULL);
4865 :
4866 : /* Propagate our own error context to libxml2 */
4867 132534 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
4868 :
4869 132534 : *isnull = false;
4870 :
4871 132534 : cur = xtCxt->xpathobj->nodesetval->nodeTab[xtCxt->row_count - 1];
4872 :
4873 : Assert(xtCxt->xpathscomp[colnum] != NULL);
4874 :
4875 132534 : PG_TRY();
4876 : {
4877 : /* Set current node as entry point for XPath evaluation */
4878 132534 : xtCxt->xpathcxt->node = cur;
4879 :
4880 : /* Evaluate column path */
4881 132534 : xpathobj = xmlXPathCompiledEval(xtCxt->xpathscomp[colnum], xtCxt->xpathcxt);
4882 132534 : if (xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
4883 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4884 : "could not create XPath object");
4885 :
4886 : /*
4887 : * There are four possible cases, depending on the number of nodes
4888 : * returned by the XPath expression and the type of the target column:
4889 : * a) XPath returns no nodes. b) The target type is XML (return all
4890 : * as XML). For non-XML return types: c) One node (return content).
4891 : * d) Multiple nodes (error).
4892 : */
4893 132534 : if (xpathobj->type == XPATH_NODESET)
4894 : {
4895 132504 : int count = 0;
4896 :
4897 132504 : if (xpathobj->nodesetval != NULL)
4898 132294 : count = xpathobj->nodesetval->nodeNr;
4899 :
4900 132504 : if (xpathobj->nodesetval == NULL || count == 0)
4901 : {
4902 22428 : *isnull = true;
4903 : }
4904 : else
4905 : {
4906 110076 : if (typid == XMLOID)
4907 : {
4908 : text *textstr;
4909 : StringInfoData str;
4910 :
4911 : /* Concatenate serialized values */
4912 72 : initStringInfo(&str);
4913 174 : for (int i = 0; i < count; i++)
4914 : {
4915 : textstr =
4916 102 : xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
4917 : xtCxt->xmlerrcxt);
4918 :
4919 102 : appendStringInfoText(&str, textstr);
4920 : }
4921 72 : cstr = str.data;
4922 : }
4923 : else
4924 : {
4925 : xmlChar *str;
4926 :
4927 110004 : if (count > 1)
4928 6 : ereport(ERROR,
4929 : (errcode(ERRCODE_CARDINALITY_VIOLATION),
4930 : errmsg("more than one value returned by column XPath expression")));
4931 :
4932 109998 : str = xmlXPathCastNodeSetToString(xpathobj->nodesetval);
4933 109998 : cstr = str ? xml_pstrdup_and_free(str) : "";
4934 : }
4935 : }
4936 : }
4937 30 : else if (xpathobj->type == XPATH_STRING)
4938 : {
4939 : /* Content should be escaped when target will be XML */
4940 18 : if (typid == XMLOID)
4941 6 : cstr = escape_xml((char *) xpathobj->stringval);
4942 : else
4943 12 : cstr = (char *) xpathobj->stringval;
4944 : }
4945 12 : else if (xpathobj->type == XPATH_BOOLEAN)
4946 : {
4947 : char typcategory;
4948 : bool typispreferred;
4949 : xmlChar *str;
4950 :
4951 : /* Allow implicit casting from boolean to numbers */
4952 6 : get_type_category_preferred(typid, &typcategory, &typispreferred);
4953 :
4954 6 : if (typcategory != TYPCATEGORY_NUMERIC)
4955 6 : str = xmlXPathCastBooleanToString(xpathobj->boolval);
4956 : else
4957 0 : str = xmlXPathCastNumberToString(xmlXPathCastBooleanToNumber(xpathobj->boolval));
4958 :
4959 6 : cstr = xml_pstrdup_and_free(str);
4960 : }
4961 6 : else if (xpathobj->type == XPATH_NUMBER)
4962 : {
4963 : xmlChar *str;
4964 :
4965 6 : str = xmlXPathCastNumberToString(xpathobj->floatval);
4966 6 : cstr = xml_pstrdup_and_free(str);
4967 : }
4968 : else
4969 0 : elog(ERROR, "unexpected XPath object type %u", xpathobj->type);
4970 :
4971 : /*
4972 : * By here, either cstr contains the result value, or the isnull flag
4973 : * has been set.
4974 : */
4975 : Assert(cstr || *isnull);
4976 :
4977 132528 : if (!*isnull)
4978 110100 : result = InputFunctionCall(&state->in_functions[colnum],
4979 : cstr,
4980 110100 : state->typioparams[colnum],
4981 : typmod);
4982 : }
4983 6 : PG_FINALLY();
4984 : {
4985 132534 : if (xpathobj != NULL)
4986 132534 : xmlXPathFreeObject(xpathobj);
4987 : }
4988 132534 : PG_END_TRY();
4989 :
4990 132528 : return result;
4991 : #else
4992 : NO_XML_SUPPORT();
4993 : return 0;
4994 : #endif /* not USE_LIBXML */
4995 : }
4996 :
4997 : /*
4998 : * XmlTableDestroyOpaque
4999 : * Release all libxml2 resources
5000 : */
5001 : static void
5002 264 : XmlTableDestroyOpaque(TableFuncScanState *state)
5003 : {
5004 : #ifdef USE_LIBXML
5005 : XmlTableBuilderData *xtCxt;
5006 :
5007 264 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableDestroyOpaque");
5008 :
5009 : /* Propagate our own error context to libxml2 */
5010 264 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
5011 :
5012 264 : if (xtCxt->xpathscomp != NULL)
5013 : {
5014 : int i;
5015 :
5016 1116 : for (i = 0; i < xtCxt->natts; i++)
5017 852 : if (xtCxt->xpathscomp[i] != NULL)
5018 774 : xmlXPathFreeCompExpr(xtCxt->xpathscomp[i]);
5019 : }
5020 :
5021 264 : if (xtCxt->xpathobj != NULL)
5022 258 : xmlXPathFreeObject(xtCxt->xpathobj);
5023 264 : if (xtCxt->xpathcomp != NULL)
5024 258 : xmlXPathFreeCompExpr(xtCxt->xpathcomp);
5025 264 : if (xtCxt->xpathcxt != NULL)
5026 264 : xmlXPathFreeContext(xtCxt->xpathcxt);
5027 264 : if (xtCxt->doc != NULL)
5028 264 : xmlFreeDoc(xtCxt->doc);
5029 264 : if (xtCxt->ctxt != NULL)
5030 264 : xmlFreeParserCtxt(xtCxt->ctxt);
5031 :
5032 264 : pg_xml_done(xtCxt->xmlerrcxt, true);
5033 :
5034 : /* not valid anymore */
5035 264 : xtCxt->magic = 0;
5036 264 : state->opaque = NULL;
5037 :
5038 : #else
5039 : NO_XML_SUPPORT();
5040 : #endif /* not USE_LIBXML */
5041 264 : }
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