Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * xml.c
4 : * XML data type support.
5 : *
6 : *
7 : * Portions Copyright (c) 1996-2023, 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/parser.h>
51 : #include <libxml/parserInternals.h>
52 : #include <libxml/tree.h>
53 : #include <libxml/uri.h>
54 : #include <libxml/xmlerror.h>
55 : #include <libxml/xmlsave.h>
56 : #include <libxml/xmlversion.h>
57 : #include <libxml/xmlwriter.h>
58 : #include <libxml/xpath.h>
59 : #include <libxml/xpathInternals.h>
60 :
61 : /*
62 : * We used to check for xmlStructuredErrorContext via a configure test; but
63 : * that doesn't work on Windows, so instead use this grottier method of
64 : * testing the library version number.
65 : */
66 : #if LIBXML_VERSION >= 20704
67 : #define HAVE_XMLSTRUCTUREDERRORCONTEXT 1
68 : #endif
69 : #endif /* USE_LIBXML */
70 :
71 : #include "access/htup_details.h"
72 : #include "access/table.h"
73 : #include "catalog/namespace.h"
74 : #include "catalog/pg_class.h"
75 : #include "catalog/pg_type.h"
76 : #include "commands/dbcommands.h"
77 : #include "executor/spi.h"
78 : #include "executor/tablefunc.h"
79 : #include "fmgr.h"
80 : #include "lib/stringinfo.h"
81 : #include "libpq/pqformat.h"
82 : #include "mb/pg_wchar.h"
83 : #include "miscadmin.h"
84 : #include "nodes/execnodes.h"
85 : #include "nodes/miscnodes.h"
86 : #include "nodes/nodeFuncs.h"
87 : #include "utils/array.h"
88 : #include "utils/builtins.h"
89 : #include "utils/date.h"
90 : #include "utils/datetime.h"
91 : #include "utils/lsyscache.h"
92 : #include "utils/memutils.h"
93 : #include "utils/rel.h"
94 : #include "utils/syscache.h"
95 : #include "utils/xml.h"
96 :
97 :
98 : /* GUC variables */
99 : int xmlbinary = XMLBINARY_BASE64;
100 : int xmloption = XMLOPTION_CONTENT;
101 :
102 : #ifdef USE_LIBXML
103 :
104 : /* random number to identify PgXmlErrorContext */
105 : #define ERRCXT_MAGIC 68275028
106 :
107 : struct PgXmlErrorContext
108 : {
109 : int magic;
110 : /* strictness argument passed to pg_xml_init */
111 : PgXmlStrictness strictness;
112 : /* current error status and accumulated message, if any */
113 : bool err_occurred;
114 : StringInfoData err_buf;
115 : /* previous libxml error handling state (saved by pg_xml_init) */
116 : xmlStructuredErrorFunc saved_errfunc;
117 : void *saved_errcxt;
118 : /* previous libxml entity handler (saved by pg_xml_init) */
119 : xmlExternalEntityLoader saved_entityfunc;
120 : };
121 :
122 : static xmlParserInputPtr xmlPgEntityLoader(const char *URL, const char *ID,
123 : xmlParserCtxtPtr ctxt);
124 : static void xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
125 : int sqlcode, const char *msg);
126 : static void xml_errorHandler(void *data, xmlErrorPtr error);
127 : static int errdetail_for_xml_code(int code);
128 : static void chopStringInfoNewlines(StringInfo str);
129 : static void appendStringInfoLineSeparator(StringInfo str);
130 :
131 : #ifdef USE_LIBXMLCONTEXT
132 :
133 : static MemoryContext LibxmlContext = NULL;
134 :
135 : static void xml_memory_init(void);
136 : static void *xml_palloc(size_t size);
137 : static void *xml_repalloc(void *ptr, size_t size);
138 : static void xml_pfree(void *ptr);
139 : static char *xml_pstrdup(const char *string);
140 : #endif /* USE_LIBXMLCONTEXT */
141 :
142 : static xmlChar *xml_text2xmlChar(text *in);
143 : static int parse_xml_decl(const xmlChar *str, size_t *lenp,
144 : xmlChar **version, xmlChar **encoding, int *standalone);
145 : static bool print_xml_decl(StringInfo buf, const xmlChar *version,
146 : pg_enc encoding, int standalone);
147 : static bool xml_doctype_in_content(const xmlChar *str);
148 : static xmlDocPtr xml_parse(text *data, XmlOptionType xmloption_arg,
149 : bool preserve_whitespace, int encoding,
150 : XmlOptionType *parsed_xmloptiontype,
151 : xmlNodePtr *parsed_nodes,
152 : Node *escontext);
153 : static text *xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt);
154 : static int xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
155 : ArrayBuildState *astate,
156 : PgXmlErrorContext *xmlerrcxt);
157 : static xmlChar *pg_xmlCharStrndup(const char *str, size_t len);
158 : #endif /* USE_LIBXML */
159 :
160 : static void xmldata_root_element_start(StringInfo result, const char *eltname,
161 : const char *xmlschema, const char *targetns,
162 : bool top_level);
163 : static void xmldata_root_element_end(StringInfo result, const char *eltname);
164 : static StringInfo query_to_xml_internal(const char *query, char *tablename,
165 : const char *xmlschema, bool nulls, bool tableforest,
166 : const char *targetns, bool top_level);
167 : static const char *map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid,
168 : bool nulls, bool tableforest, const char *targetns);
169 : static const char *map_sql_schema_to_xmlschema_types(Oid nspid,
170 : List *relid_list, bool nulls,
171 : bool tableforest, const char *targetns);
172 : static const char *map_sql_catalog_to_xmlschema_types(List *nspid_list,
173 : bool nulls, bool tableforest,
174 : const char *targetns);
175 : static const char *map_sql_type_to_xml_name(Oid typeoid, int typmod);
176 : static const char *map_sql_typecoll_to_xmlschema_types(List *tupdesc_list);
177 : static const char *map_sql_type_to_xmlschema_type(Oid typeoid, int typmod);
178 : static void SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result,
179 : char *tablename, bool nulls, bool tableforest,
180 : const char *targetns, bool top_level);
181 :
182 : /* XMLTABLE support */
183 : #ifdef USE_LIBXML
184 : /* random number to identify XmlTableContext */
185 : #define XMLTABLE_CONTEXT_MAGIC 46922182
186 : typedef struct XmlTableBuilderData
187 : {
188 : int magic;
189 : int natts;
190 : long int row_count;
191 : PgXmlErrorContext *xmlerrcxt;
192 : xmlParserCtxtPtr ctxt;
193 : xmlDocPtr doc;
194 : xmlXPathContextPtr xpathcxt;
195 : xmlXPathCompExprPtr xpathcomp;
196 : xmlXPathObjectPtr xpathobj;
197 : xmlXPathCompExprPtr *xpathscomp;
198 : } XmlTableBuilderData;
199 : #endif
200 :
201 : static void XmlTableInitOpaque(struct TableFuncScanState *state, int natts);
202 : static void XmlTableSetDocument(struct TableFuncScanState *state, Datum value);
203 : static void XmlTableSetNamespace(struct TableFuncScanState *state, const char *name,
204 : const char *uri);
205 : static void XmlTableSetRowFilter(struct TableFuncScanState *state, const char *path);
206 : static void XmlTableSetColumnFilter(struct TableFuncScanState *state,
207 : const char *path, int colnum);
208 : static bool XmlTableFetchRow(struct TableFuncScanState *state);
209 : static Datum XmlTableGetValue(struct TableFuncScanState *state, int colnum,
210 : Oid typid, int32 typmod, bool *isnull);
211 : static void XmlTableDestroyOpaque(struct TableFuncScanState *state);
212 :
213 : const TableFuncRoutine XmlTableRoutine =
214 : {
215 : XmlTableInitOpaque,
216 : XmlTableSetDocument,
217 : XmlTableSetNamespace,
218 : XmlTableSetRowFilter,
219 : XmlTableSetColumnFilter,
220 : XmlTableFetchRow,
221 : XmlTableGetValue,
222 : XmlTableDestroyOpaque
223 : };
224 :
225 : #define NO_XML_SUPPORT() \
226 : ereport(ERROR, \
227 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
228 : errmsg("unsupported XML feature"), \
229 : errdetail("This functionality requires the server to be built with libxml support.")))
230 :
231 :
232 : /* from SQL/XML:2008 section 4.9 */
233 : #define NAMESPACE_XSD "http://www.w3.org/2001/XMLSchema"
234 : #define NAMESPACE_XSI "http://www.w3.org/2001/XMLSchema-instance"
235 : #define NAMESPACE_SQLXML "http://standards.iso.org/iso/9075/2003/sqlxml"
236 :
237 :
238 : #ifdef USE_LIBXML
239 :
240 : static int
241 0 : xmlChar_to_encoding(const xmlChar *encoding_name)
242 : {
243 0 : int encoding = pg_char_to_encoding((const char *) encoding_name);
244 :
245 0 : if (encoding < 0)
246 0 : ereport(ERROR,
247 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
248 : errmsg("invalid encoding name \"%s\"",
249 : (const char *) encoding_name)));
250 0 : return encoding;
251 : }
252 : #endif
253 :
254 :
255 : /*
256 : * xml_in uses a plain C string to VARDATA conversion, so for the time being
257 : * we use the conversion function for the text datatype.
258 : *
259 : * This is only acceptable so long as xmltype and text use the same
260 : * representation.
261 : */
262 : Datum
263 822 : xml_in(PG_FUNCTION_ARGS)
264 : {
265 : #ifdef USE_LIBXML
266 822 : char *s = PG_GETARG_CSTRING(0);
267 : xmltype *vardata;
268 : xmlDocPtr doc;
269 :
270 : /* Build the result object. */
271 822 : vardata = (xmltype *) cstring_to_text(s);
272 :
273 : /*
274 : * Parse the data to check if it is well-formed XML data.
275 : *
276 : * Note: we don't need to worry about whether a soft error is detected.
277 : */
278 822 : doc = xml_parse(vardata, xmloption, true, GetDatabaseEncoding(),
279 822 : NULL, NULL, fcinfo->context);
280 774 : if (doc != NULL)
281 762 : xmlFreeDoc(doc);
282 :
283 774 : PG_RETURN_XML_P(vardata);
284 : #else
285 : NO_XML_SUPPORT();
286 : return 0;
287 : #endif
288 : }
289 :
290 :
291 : #define PG_XML_DEFAULT_VERSION "1.0"
292 :
293 :
294 : /*
295 : * xml_out_internal uses a plain VARDATA to C string conversion, so for the
296 : * time being we use the conversion function for the text datatype.
297 : *
298 : * This is only acceptable so long as xmltype and text use the same
299 : * representation.
300 : */
301 : static char *
302 22812 : xml_out_internal(xmltype *x, pg_enc target_encoding)
303 : {
304 22812 : char *str = text_to_cstring((text *) x);
305 :
306 : #ifdef USE_LIBXML
307 22812 : size_t len = strlen(str);
308 : xmlChar *version;
309 : int standalone;
310 : int res_code;
311 :
312 22812 : if ((res_code = parse_xml_decl((xmlChar *) str,
313 : &len, &version, NULL, &standalone)) == 0)
314 : {
315 : StringInfoData buf;
316 :
317 22812 : initStringInfo(&buf);
318 :
319 22812 : if (!print_xml_decl(&buf, version, target_encoding, standalone))
320 : {
321 : /*
322 : * If we are not going to produce an XML declaration, eat a single
323 : * newline in the original string to prevent empty first lines in
324 : * the output.
325 : */
326 22764 : if (*(str + len) == '\n')
327 6 : len += 1;
328 : }
329 22812 : appendStringInfoString(&buf, str + len);
330 :
331 22812 : pfree(str);
332 :
333 22812 : return buf.data;
334 : }
335 :
336 0 : ereport(WARNING,
337 : errcode(ERRCODE_INTERNAL_ERROR),
338 : errmsg_internal("could not parse XML declaration in stored value"),
339 : errdetail_for_xml_code(res_code));
340 : #endif
341 0 : return str;
342 : }
343 :
344 :
345 : Datum
346 22548 : xml_out(PG_FUNCTION_ARGS)
347 : {
348 22548 : xmltype *x = PG_GETARG_XML_P(0);
349 :
350 : /*
351 : * xml_out removes the encoding property in all cases. This is because we
352 : * cannot control from here whether the datum will be converted to a
353 : * different client encoding, so we'd do more harm than good by including
354 : * it.
355 : */
356 22548 : PG_RETURN_CSTRING(xml_out_internal(x, 0));
357 : }
358 :
359 :
360 : Datum
361 0 : xml_recv(PG_FUNCTION_ARGS)
362 : {
363 : #ifdef USE_LIBXML
364 0 : StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
365 : xmltype *result;
366 : char *str;
367 : char *newstr;
368 : int nbytes;
369 : xmlDocPtr doc;
370 0 : xmlChar *encodingStr = NULL;
371 : int encoding;
372 :
373 : /*
374 : * Read the data in raw format. We don't know yet what the encoding is, as
375 : * that information is embedded in the xml declaration; so we have to
376 : * parse that before converting to server encoding.
377 : */
378 0 : nbytes = buf->len - buf->cursor;
379 0 : str = (char *) pq_getmsgbytes(buf, nbytes);
380 :
381 : /*
382 : * We need a null-terminated string to pass to parse_xml_decl(). Rather
383 : * than make a separate copy, make the temporary result one byte bigger
384 : * than it needs to be.
385 : */
386 0 : result = palloc(nbytes + 1 + VARHDRSZ);
387 0 : SET_VARSIZE(result, nbytes + VARHDRSZ);
388 0 : memcpy(VARDATA(result), str, nbytes);
389 0 : str = VARDATA(result);
390 0 : str[nbytes] = '\0';
391 :
392 0 : parse_xml_decl((const xmlChar *) str, NULL, NULL, &encodingStr, NULL);
393 :
394 : /*
395 : * If encoding wasn't explicitly specified in the XML header, treat it as
396 : * UTF-8, as that's the default in XML. This is different from xml_in(),
397 : * where the input has to go through the normal client to server encoding
398 : * conversion.
399 : */
400 0 : encoding = encodingStr ? xmlChar_to_encoding(encodingStr) : PG_UTF8;
401 :
402 : /*
403 : * Parse the data to check if it is well-formed XML data. Assume that
404 : * xml_parse will throw ERROR if not.
405 : */
406 0 : doc = xml_parse(result, xmloption, true, encoding, NULL, NULL, NULL);
407 0 : xmlFreeDoc(doc);
408 :
409 : /* Now that we know what we're dealing with, convert to server encoding */
410 0 : newstr = pg_any_to_server(str, nbytes, encoding);
411 :
412 0 : if (newstr != str)
413 : {
414 0 : pfree(result);
415 0 : result = (xmltype *) cstring_to_text(newstr);
416 0 : pfree(newstr);
417 : }
418 :
419 0 : PG_RETURN_XML_P(result);
420 : #else
421 : NO_XML_SUPPORT();
422 : return 0;
423 : #endif
424 : }
425 :
426 :
427 : Datum
428 0 : xml_send(PG_FUNCTION_ARGS)
429 : {
430 0 : xmltype *x = PG_GETARG_XML_P(0);
431 : char *outval;
432 : StringInfoData buf;
433 :
434 : /*
435 : * xml_out_internal doesn't convert the encoding, it just prints the right
436 : * declaration. pq_sendtext will do the conversion.
437 : */
438 0 : outval = xml_out_internal(x, pg_get_client_encoding());
439 :
440 0 : pq_begintypsend(&buf);
441 0 : pq_sendtext(&buf, outval, strlen(outval));
442 0 : pfree(outval);
443 0 : PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
444 : }
445 :
446 :
447 : #ifdef USE_LIBXML
448 : static void
449 132 : appendStringInfoText(StringInfo str, const text *t)
450 : {
451 132 : appendBinaryStringInfo(str, VARDATA_ANY(t), VARSIZE_ANY_EXHDR(t));
452 132 : }
453 : #endif
454 :
455 :
456 : static xmltype *
457 21822 : stringinfo_to_xmltype(StringInfo buf)
458 : {
459 21822 : return (xmltype *) cstring_to_text_with_len(buf->data, buf->len);
460 : }
461 :
462 :
463 : static xmltype *
464 78 : cstring_to_xmltype(const char *string)
465 : {
466 78 : return (xmltype *) cstring_to_text(string);
467 : }
468 :
469 :
470 : #ifdef USE_LIBXML
471 : static xmltype *
472 21944 : xmlBuffer_to_xmltype(xmlBufferPtr buf)
473 : {
474 21944 : return (xmltype *) cstring_to_text_with_len((const char *) xmlBufferContent(buf),
475 : xmlBufferLength(buf));
476 : }
477 : #endif
478 :
479 :
480 : Datum
481 42 : xmlcomment(PG_FUNCTION_ARGS)
482 : {
483 : #ifdef USE_LIBXML
484 42 : text *arg = PG_GETARG_TEXT_PP(0);
485 42 : char *argdata = VARDATA_ANY(arg);
486 42 : int len = VARSIZE_ANY_EXHDR(arg);
487 : StringInfoData buf;
488 : int i;
489 :
490 : /* check for "--" in string or "-" at the end */
491 180 : for (i = 1; i < len; i++)
492 : {
493 144 : if (argdata[i] == '-' && argdata[i - 1] == '-')
494 6 : ereport(ERROR,
495 : (errcode(ERRCODE_INVALID_XML_COMMENT),
496 : errmsg("invalid XML comment")));
497 : }
498 36 : if (len > 0 && argdata[len - 1] == '-')
499 6 : ereport(ERROR,
500 : (errcode(ERRCODE_INVALID_XML_COMMENT),
501 : errmsg("invalid XML comment")));
502 :
503 30 : initStringInfo(&buf);
504 30 : appendStringInfoString(&buf, "<!--");
505 30 : appendStringInfoText(&buf, arg);
506 30 : appendStringInfoString(&buf, "-->");
507 :
508 30 : PG_RETURN_XML_P(stringinfo_to_xmltype(&buf));
509 : #else
510 : NO_XML_SUPPORT();
511 : return 0;
512 : #endif
513 : }
514 :
515 :
516 :
517 : /*
518 : * TODO: xmlconcat needs to merge the notations and unparsed entities
519 : * of the argument values. Not very important in practice, though.
520 : */
521 : xmltype *
522 21572 : xmlconcat(List *args)
523 : {
524 : #ifdef USE_LIBXML
525 21572 : int global_standalone = 1;
526 21572 : xmlChar *global_version = NULL;
527 21572 : bool global_version_no_value = false;
528 : StringInfoData buf;
529 : ListCell *v;
530 :
531 21572 : initStringInfo(&buf);
532 64722 : foreach(v, args)
533 : {
534 43150 : xmltype *x = DatumGetXmlP(PointerGetDatum(lfirst(v)));
535 : size_t len;
536 : xmlChar *version;
537 : int standalone;
538 : char *str;
539 :
540 43150 : len = VARSIZE(x) - VARHDRSZ;
541 43150 : str = text_to_cstring((text *) x);
542 :
543 43150 : parse_xml_decl((xmlChar *) str, &len, &version, NULL, &standalone);
544 :
545 43150 : if (standalone == 0 && global_standalone == 1)
546 0 : global_standalone = 0;
547 43150 : if (standalone < 0)
548 43138 : global_standalone = -1;
549 :
550 43150 : if (!version)
551 43132 : global_version_no_value = true;
552 18 : else if (!global_version)
553 12 : global_version = version;
554 6 : else if (xmlStrcmp(version, global_version) != 0)
555 0 : global_version_no_value = true;
556 :
557 43150 : appendStringInfoString(&buf, str + len);
558 43150 : pfree(str);
559 : }
560 :
561 21572 : if (!global_version_no_value || global_standalone >= 0)
562 : {
563 : StringInfoData buf2;
564 :
565 6 : initStringInfo(&buf2);
566 :
567 6 : print_xml_decl(&buf2,
568 6 : (!global_version_no_value) ? global_version : NULL,
569 : 0,
570 : global_standalone);
571 :
572 6 : appendBinaryStringInfo(&buf2, buf.data, buf.len);
573 6 : buf = buf2;
574 : }
575 :
576 21572 : return stringinfo_to_xmltype(&buf);
577 : #else
578 : NO_XML_SUPPORT();
579 : return NULL;
580 : #endif
581 : }
582 :
583 :
584 : /*
585 : * XMLAGG support
586 : */
587 : Datum
588 21548 : xmlconcat2(PG_FUNCTION_ARGS)
589 : {
590 21548 : if (PG_ARGISNULL(0))
591 : {
592 18 : if (PG_ARGISNULL(1))
593 0 : PG_RETURN_NULL();
594 : else
595 18 : PG_RETURN_XML_P(PG_GETARG_XML_P(1));
596 : }
597 21530 : else if (PG_ARGISNULL(1))
598 0 : PG_RETURN_XML_P(PG_GETARG_XML_P(0));
599 : else
600 21530 : PG_RETURN_XML_P(xmlconcat(list_make2(PG_GETARG_XML_P(0),
601 : PG_GETARG_XML_P(1))));
602 : }
603 :
604 :
605 : Datum
606 6 : texttoxml(PG_FUNCTION_ARGS)
607 : {
608 6 : text *data = PG_GETARG_TEXT_PP(0);
609 :
610 6 : PG_RETURN_XML_P(xmlparse(data, xmloption, true));
611 : }
612 :
613 :
614 : Datum
615 0 : xmltotext(PG_FUNCTION_ARGS)
616 : {
617 0 : xmltype *data = PG_GETARG_XML_P(0);
618 :
619 : /* It's actually binary compatible. */
620 0 : PG_RETURN_TEXT_P((text *) data);
621 : }
622 :
623 :
624 : text *
625 168 : xmltotext_with_options(xmltype *data, XmlOptionType xmloption_arg, bool indent)
626 : {
627 : #ifdef USE_LIBXML
628 : text *volatile result;
629 : xmlDocPtr doc;
630 : XmlOptionType parsed_xmloptiontype;
631 : xmlNodePtr content_nodes;
632 168 : volatile xmlBufferPtr buf = NULL;
633 168 : volatile xmlSaveCtxtPtr ctxt = NULL;
634 168 : ErrorSaveContext escontext = {T_ErrorSaveContext};
635 : PgXmlErrorContext *xmlerrcxt;
636 : #endif
637 :
638 168 : if (xmloption_arg != XMLOPTION_DOCUMENT && !indent)
639 : {
640 : /*
641 : * We don't actually need to do anything, so just return the
642 : * binary-compatible input. For backwards-compatibility reasons,
643 : * allow such cases to succeed even without USE_LIBXML.
644 : */
645 36 : return (text *) data;
646 : }
647 :
648 : #ifdef USE_LIBXML
649 : /* Parse the input according to the xmloption */
650 132 : doc = xml_parse(data, xmloption_arg, true, GetDatabaseEncoding(),
651 : &parsed_xmloptiontype, &content_nodes,
652 : (Node *) &escontext);
653 132 : if (doc == NULL || escontext.error_occurred)
654 : {
655 30 : if (doc)
656 0 : xmlFreeDoc(doc);
657 : /* A soft error must be failure to conform to XMLOPTION_DOCUMENT */
658 30 : ereport(ERROR,
659 : (errcode(ERRCODE_NOT_AN_XML_DOCUMENT),
660 : errmsg("not an XML document")));
661 : }
662 :
663 : /* If we weren't asked to indent, we're done. */
664 102 : if (!indent)
665 : {
666 18 : xmlFreeDoc(doc);
667 18 : return (text *) data;
668 : }
669 :
670 : /* Otherwise, we gotta spin up some error handling. */
671 84 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
672 :
673 84 : PG_TRY();
674 : {
675 84 : size_t decl_len = 0;
676 :
677 : /* The serialized data will go into this buffer. */
678 84 : buf = xmlBufferCreate();
679 :
680 84 : if (buf == NULL || xmlerrcxt->err_occurred)
681 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
682 : "could not allocate xmlBuffer");
683 :
684 : /* Detect whether there's an XML declaration */
685 84 : parse_xml_decl(xml_text2xmlChar(data), &decl_len, NULL, NULL, NULL);
686 :
687 : /*
688 : * Emit declaration only if the input had one. Note: some versions of
689 : * xmlSaveToBuffer leak memory if a non-null encoding argument is
690 : * passed, so don't do that. We don't want any encoding conversion
691 : * anyway.
692 : */
693 84 : if (decl_len == 0)
694 72 : ctxt = xmlSaveToBuffer(buf, NULL,
695 : XML_SAVE_NO_DECL | XML_SAVE_FORMAT);
696 : else
697 12 : ctxt = xmlSaveToBuffer(buf, NULL,
698 : XML_SAVE_FORMAT);
699 :
700 84 : if (ctxt == NULL || xmlerrcxt->err_occurred)
701 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
702 : "could not allocate xmlSaveCtxt");
703 :
704 84 : if (parsed_xmloptiontype == XMLOPTION_DOCUMENT)
705 : {
706 : /* If it's a document, saving is easy. */
707 36 : if (xmlSaveDoc(ctxt, doc) == -1 || xmlerrcxt->err_occurred)
708 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
709 : "could not save document to xmlBuffer");
710 : }
711 48 : else if (content_nodes != NULL)
712 : {
713 : /*
714 : * Deal with the case where we have non-singly-rooted XML.
715 : * libxml's dump functions don't work well for that without help.
716 : * We build a fake root node that serves as a container for the
717 : * content nodes, and then iterate over the nodes.
718 : */
719 : xmlNodePtr root;
720 : xmlNodePtr newline;
721 :
722 42 : root = xmlNewNode(NULL, (const xmlChar *) "content-root");
723 42 : if (root == NULL || xmlerrcxt->err_occurred)
724 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
725 : "could not allocate xml node");
726 :
727 : /* This attaches root to doc, so we need not free it separately. */
728 42 : xmlDocSetRootElement(doc, root);
729 42 : xmlAddChild(root, content_nodes);
730 :
731 : /*
732 : * We use this node to insert newlines in the dump. Note: in at
733 : * least some libxml versions, xmlNewDocText would not attach the
734 : * node to the document even if we passed it. Therefore, manage
735 : * freeing of this node manually, and pass NULL here to make sure
736 : * there's not a dangling link.
737 : */
738 42 : newline = xmlNewDocText(NULL, (const xmlChar *) "\n");
739 42 : if (newline == NULL || xmlerrcxt->err_occurred)
740 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
741 : "could not allocate xml node");
742 :
743 108 : for (xmlNodePtr node = root->children; node; node = node->next)
744 : {
745 : /* insert newlines between nodes */
746 66 : if (node->type != XML_TEXT_NODE && node->prev != NULL)
747 : {
748 18 : if (xmlSaveTree(ctxt, newline) == -1 || xmlerrcxt->err_occurred)
749 : {
750 0 : xmlFreeNode(newline);
751 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
752 : "could not save newline to xmlBuffer");
753 : }
754 : }
755 :
756 66 : if (xmlSaveTree(ctxt, node) == -1 || xmlerrcxt->err_occurred)
757 : {
758 0 : xmlFreeNode(newline);
759 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
760 : "could not save content to xmlBuffer");
761 : }
762 : }
763 :
764 42 : xmlFreeNode(newline);
765 : }
766 :
767 84 : if (xmlSaveClose(ctxt) == -1 || xmlerrcxt->err_occurred)
768 : {
769 0 : ctxt = NULL; /* don't try to close it again */
770 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
771 : "could not close xmlSaveCtxtPtr");
772 : }
773 :
774 84 : result = (text *) xmlBuffer_to_xmltype(buf);
775 : }
776 0 : PG_CATCH();
777 : {
778 0 : if (ctxt)
779 0 : xmlSaveClose(ctxt);
780 0 : if (buf)
781 0 : xmlBufferFree(buf);
782 0 : if (doc)
783 0 : xmlFreeDoc(doc);
784 :
785 0 : pg_xml_done(xmlerrcxt, true);
786 :
787 0 : PG_RE_THROW();
788 : }
789 84 : PG_END_TRY();
790 :
791 84 : xmlBufferFree(buf);
792 84 : xmlFreeDoc(doc);
793 :
794 84 : pg_xml_done(xmlerrcxt, false);
795 :
796 84 : return result;
797 : #else
798 : NO_XML_SUPPORT();
799 : return NULL;
800 : #endif
801 : }
802 :
803 :
804 : xmltype *
805 21704 : xmlelement(XmlExpr *xexpr,
806 : Datum *named_argvalue, bool *named_argnull,
807 : Datum *argvalue, bool *argnull)
808 : {
809 : #ifdef USE_LIBXML
810 : xmltype *result;
811 : List *named_arg_strings;
812 : List *arg_strings;
813 : int i;
814 : ListCell *arg;
815 : ListCell *narg;
816 : PgXmlErrorContext *xmlerrcxt;
817 21704 : volatile xmlBufferPtr buf = NULL;
818 21704 : volatile xmlTextWriterPtr writer = NULL;
819 :
820 : /*
821 : * All arguments are already evaluated, and their values are passed in the
822 : * named_argvalue/named_argnull or argvalue/argnull arrays. This avoids
823 : * issues if one of the arguments involves a call to some other function
824 : * or subsystem that wants to use libxml on its own terms. We examine the
825 : * original XmlExpr to identify the numbers and types of the arguments.
826 : */
827 21704 : named_arg_strings = NIL;
828 21704 : i = 0;
829 21752 : foreach(arg, xexpr->named_args)
830 : {
831 54 : Expr *e = (Expr *) lfirst(arg);
832 : char *str;
833 :
834 54 : if (named_argnull[i])
835 0 : str = NULL;
836 : else
837 54 : str = map_sql_value_to_xml_value(named_argvalue[i],
838 : exprType((Node *) e),
839 : false);
840 48 : named_arg_strings = lappend(named_arg_strings, str);
841 48 : i++;
842 : }
843 :
844 21698 : arg_strings = NIL;
845 21698 : i = 0;
846 43372 : foreach(arg, xexpr->args)
847 : {
848 21674 : Expr *e = (Expr *) lfirst(arg);
849 : char *str;
850 :
851 : /* here we can just forget NULL elements immediately */
852 21674 : if (!argnull[i])
853 : {
854 21674 : str = map_sql_value_to_xml_value(argvalue[i],
855 : exprType((Node *) e),
856 : true);
857 21674 : arg_strings = lappend(arg_strings, str);
858 : }
859 21674 : i++;
860 : }
861 :
862 21698 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
863 :
864 21698 : PG_TRY();
865 : {
866 21698 : buf = xmlBufferCreate();
867 21698 : if (buf == NULL || xmlerrcxt->err_occurred)
868 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
869 : "could not allocate xmlBuffer");
870 21698 : writer = xmlNewTextWriterMemory(buf, 0);
871 21698 : if (writer == NULL || xmlerrcxt->err_occurred)
872 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
873 : "could not allocate xmlTextWriter");
874 :
875 21698 : xmlTextWriterStartElement(writer, (xmlChar *) xexpr->name);
876 :
877 21746 : forboth(arg, named_arg_strings, narg, xexpr->arg_names)
878 : {
879 48 : char *str = (char *) lfirst(arg);
880 48 : char *argname = strVal(lfirst(narg));
881 :
882 48 : if (str)
883 48 : xmlTextWriterWriteAttribute(writer,
884 : (xmlChar *) argname,
885 : (xmlChar *) str);
886 : }
887 :
888 43372 : foreach(arg, arg_strings)
889 : {
890 21674 : char *str = (char *) lfirst(arg);
891 :
892 21674 : xmlTextWriterWriteRaw(writer, (xmlChar *) str);
893 : }
894 :
895 21698 : xmlTextWriterEndElement(writer);
896 :
897 : /* we MUST do this now to flush data out to the buffer ... */
898 21698 : xmlFreeTextWriter(writer);
899 21698 : writer = NULL;
900 :
901 21698 : result = xmlBuffer_to_xmltype(buf);
902 : }
903 0 : PG_CATCH();
904 : {
905 0 : if (writer)
906 0 : xmlFreeTextWriter(writer);
907 0 : if (buf)
908 0 : xmlBufferFree(buf);
909 :
910 0 : pg_xml_done(xmlerrcxt, true);
911 :
912 0 : PG_RE_THROW();
913 : }
914 21698 : PG_END_TRY();
915 :
916 21698 : xmlBufferFree(buf);
917 :
918 21698 : pg_xml_done(xmlerrcxt, false);
919 :
920 21698 : return result;
921 : #else
922 : NO_XML_SUPPORT();
923 : return NULL;
924 : #endif
925 : }
926 :
927 :
928 : xmltype *
929 138 : xmlparse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace)
930 : {
931 : #ifdef USE_LIBXML
932 : xmlDocPtr doc;
933 :
934 138 : doc = xml_parse(data, xmloption_arg, preserve_whitespace,
935 : GetDatabaseEncoding(), NULL, NULL, NULL);
936 90 : xmlFreeDoc(doc);
937 :
938 90 : return (xmltype *) data;
939 : #else
940 : NO_XML_SUPPORT();
941 : return NULL;
942 : #endif
943 : }
944 :
945 :
946 : xmltype *
947 72 : xmlpi(const char *target, text *arg, bool arg_is_null, bool *result_is_null)
948 : {
949 : #ifdef USE_LIBXML
950 : xmltype *result;
951 : StringInfoData buf;
952 :
953 72 : if (pg_strcasecmp(target, "xml") == 0)
954 12 : ereport(ERROR,
955 : (errcode(ERRCODE_SYNTAX_ERROR), /* really */
956 : errmsg("invalid XML processing instruction"),
957 : errdetail("XML processing instruction target name cannot be \"%s\".", target)));
958 :
959 : /*
960 : * Following the SQL standard, the null check comes after the syntax check
961 : * above.
962 : */
963 60 : *result_is_null = arg_is_null;
964 60 : if (*result_is_null)
965 12 : return NULL;
966 :
967 48 : initStringInfo(&buf);
968 :
969 48 : appendStringInfo(&buf, "<?%s", target);
970 :
971 48 : if (arg != NULL)
972 : {
973 : char *string;
974 :
975 24 : string = text_to_cstring(arg);
976 24 : if (strstr(string, "?>") != NULL)
977 6 : ereport(ERROR,
978 : (errcode(ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION),
979 : errmsg("invalid XML processing instruction"),
980 : errdetail("XML processing instruction cannot contain \"?>\".")));
981 :
982 18 : appendStringInfoChar(&buf, ' ');
983 18 : appendStringInfoString(&buf, string + strspn(string, " "));
984 18 : pfree(string);
985 : }
986 42 : appendStringInfoString(&buf, "?>");
987 :
988 42 : result = stringinfo_to_xmltype(&buf);
989 42 : pfree(buf.data);
990 42 : return result;
991 : #else
992 : NO_XML_SUPPORT();
993 : return NULL;
994 : #endif
995 : }
996 :
997 :
998 : xmltype *
999 60 : xmlroot(xmltype *data, text *version, int standalone)
1000 : {
1001 : #ifdef USE_LIBXML
1002 : char *str;
1003 : size_t len;
1004 : xmlChar *orig_version;
1005 : int orig_standalone;
1006 : StringInfoData buf;
1007 :
1008 60 : len = VARSIZE(data) - VARHDRSZ;
1009 60 : str = text_to_cstring((text *) data);
1010 :
1011 60 : parse_xml_decl((xmlChar *) str, &len, &orig_version, NULL, &orig_standalone);
1012 :
1013 60 : if (version)
1014 24 : orig_version = xml_text2xmlChar(version);
1015 : else
1016 36 : orig_version = NULL;
1017 :
1018 60 : switch (standalone)
1019 : {
1020 18 : case XML_STANDALONE_YES:
1021 18 : orig_standalone = 1;
1022 18 : break;
1023 12 : case XML_STANDALONE_NO:
1024 12 : orig_standalone = 0;
1025 12 : break;
1026 12 : case XML_STANDALONE_NO_VALUE:
1027 12 : orig_standalone = -1;
1028 12 : break;
1029 18 : case XML_STANDALONE_OMITTED:
1030 : /* leave original value */
1031 18 : break;
1032 : }
1033 :
1034 60 : initStringInfo(&buf);
1035 60 : print_xml_decl(&buf, orig_version, 0, orig_standalone);
1036 60 : appendStringInfoString(&buf, str + len);
1037 :
1038 60 : return stringinfo_to_xmltype(&buf);
1039 : #else
1040 : NO_XML_SUPPORT();
1041 : return NULL;
1042 : #endif
1043 : }
1044 :
1045 :
1046 : /*
1047 : * Validate document (given as string) against DTD (given as external link)
1048 : *
1049 : * This has been removed because it is a security hole: unprivileged users
1050 : * should not be able to use Postgres to fetch arbitrary external files,
1051 : * which unfortunately is exactly what libxml is willing to do with the DTD
1052 : * parameter.
1053 : */
1054 : Datum
1055 0 : xmlvalidate(PG_FUNCTION_ARGS)
1056 : {
1057 0 : ereport(ERROR,
1058 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1059 : errmsg("xmlvalidate is not implemented")));
1060 : return 0;
1061 : }
1062 :
1063 :
1064 : bool
1065 24 : xml_is_document(xmltype *arg)
1066 : {
1067 : #ifdef USE_LIBXML
1068 : xmlDocPtr doc;
1069 24 : ErrorSaveContext escontext = {T_ErrorSaveContext};
1070 :
1071 : /*
1072 : * We'll report "true" if no soft error is reported by xml_parse().
1073 : */
1074 24 : doc = xml_parse((text *) arg, XMLOPTION_DOCUMENT, true,
1075 : GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
1076 24 : if (doc)
1077 12 : xmlFreeDoc(doc);
1078 :
1079 24 : return !escontext.error_occurred;
1080 : #else /* not USE_LIBXML */
1081 : NO_XML_SUPPORT();
1082 : return false;
1083 : #endif /* not USE_LIBXML */
1084 : }
1085 :
1086 :
1087 : #ifdef USE_LIBXML
1088 :
1089 : /*
1090 : * pg_xml_init_library --- set up for use of libxml
1091 : *
1092 : * This should be called by each function that is about to use libxml
1093 : * facilities but doesn't require error handling. It initializes libxml
1094 : * and verifies compatibility with the loaded libxml version. These are
1095 : * once-per-session activities.
1096 : *
1097 : * TODO: xmlChar is utf8-char, make proper tuning (initdb with enc!=utf8 and
1098 : * check)
1099 : */
1100 : void
1101 91476 : pg_xml_init_library(void)
1102 : {
1103 : static bool first_time = true;
1104 :
1105 91476 : if (first_time)
1106 : {
1107 : /* Stuff we need do only once per session */
1108 :
1109 : /*
1110 : * Currently, we have no pure UTF-8 support for internals -- check if
1111 : * we can work.
1112 : */
1113 : if (sizeof(char) != sizeof(xmlChar))
1114 : ereport(ERROR,
1115 : (errmsg("could not initialize XML library"),
1116 : errdetail("libxml2 has incompatible char type: sizeof(char)=%zu, sizeof(xmlChar)=%zu.",
1117 : sizeof(char), sizeof(xmlChar))));
1118 :
1119 : #ifdef USE_LIBXMLCONTEXT
1120 : /* Set up libxml's memory allocation our way */
1121 : xml_memory_init();
1122 : #endif
1123 :
1124 : /* Check library compatibility */
1125 26 : LIBXML_TEST_VERSION;
1126 :
1127 26 : first_time = false;
1128 : }
1129 91476 : }
1130 :
1131 : /*
1132 : * pg_xml_init --- set up for use of libxml and register an error handler
1133 : *
1134 : * This should be called by each function that is about to use libxml
1135 : * facilities and requires error handling. It initializes libxml with
1136 : * pg_xml_init_library() and establishes our libxml error handler.
1137 : *
1138 : * strictness determines which errors are reported and which are ignored.
1139 : *
1140 : * Calls to this function MUST be followed by a PG_TRY block that guarantees
1141 : * that pg_xml_done() is called during either normal or error exit.
1142 : *
1143 : * This is exported for use by contrib/xml2, as well as other code that might
1144 : * wish to share use of this module's libxml error handler.
1145 : */
1146 : PgXmlErrorContext *
1147 23876 : pg_xml_init(PgXmlStrictness strictness)
1148 : {
1149 : PgXmlErrorContext *errcxt;
1150 : void *new_errcxt;
1151 :
1152 : /* Do one-time setup if needed */
1153 23876 : pg_xml_init_library();
1154 :
1155 : /* Create error handling context structure */
1156 23876 : errcxt = (PgXmlErrorContext *) palloc(sizeof(PgXmlErrorContext));
1157 23876 : errcxt->magic = ERRCXT_MAGIC;
1158 23876 : errcxt->strictness = strictness;
1159 23876 : errcxt->err_occurred = false;
1160 23876 : initStringInfo(&errcxt->err_buf);
1161 :
1162 : /*
1163 : * Save original error handler and install ours. libxml originally didn't
1164 : * distinguish between the contexts for generic and for structured error
1165 : * handlers. If we're using an old libxml version, we must thus save the
1166 : * generic error context, even though we're using a structured error
1167 : * handler.
1168 : */
1169 23876 : errcxt->saved_errfunc = xmlStructuredError;
1170 :
1171 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1172 23876 : errcxt->saved_errcxt = xmlStructuredErrorContext;
1173 : #else
1174 : errcxt->saved_errcxt = xmlGenericErrorContext;
1175 : #endif
1176 :
1177 23876 : xmlSetStructuredErrorFunc((void *) errcxt, xml_errorHandler);
1178 :
1179 : /*
1180 : * Verify that xmlSetStructuredErrorFunc set the context variable we
1181 : * expected it to. If not, the error context pointer we just saved is not
1182 : * the correct thing to restore, and since that leaves us without a way to
1183 : * restore the context in pg_xml_done, we must fail.
1184 : *
1185 : * The only known situation in which this test fails is if we compile with
1186 : * headers from a libxml2 that doesn't track the structured error context
1187 : * separately (< 2.7.4), but at runtime use a version that does, or vice
1188 : * versa. The libxml2 authors did not treat that change as constituting
1189 : * an ABI break, so the LIBXML_TEST_VERSION test in pg_xml_init_library
1190 : * fails to protect us from this.
1191 : */
1192 :
1193 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1194 23876 : new_errcxt = xmlStructuredErrorContext;
1195 : #else
1196 : new_errcxt = xmlGenericErrorContext;
1197 : #endif
1198 :
1199 23876 : if (new_errcxt != (void *) errcxt)
1200 0 : ereport(ERROR,
1201 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1202 : errmsg("could not set up XML error handler"),
1203 : errhint("This probably indicates that the version of libxml2"
1204 : " being used is not compatible with the libxml2"
1205 : " header files that PostgreSQL was built with.")));
1206 :
1207 : /*
1208 : * Also, install an entity loader to prevent unwanted fetches of external
1209 : * files and URLs.
1210 : */
1211 23876 : errcxt->saved_entityfunc = xmlGetExternalEntityLoader();
1212 23876 : xmlSetExternalEntityLoader(xmlPgEntityLoader);
1213 :
1214 23876 : return errcxt;
1215 : }
1216 :
1217 :
1218 : /*
1219 : * pg_xml_done --- restore previous libxml error handling
1220 : *
1221 : * Resets libxml's global error-handling state to what it was before
1222 : * pg_xml_init() was called.
1223 : *
1224 : * This routine verifies that all pending errors have been dealt with
1225 : * (in assert-enabled builds, anyway).
1226 : */
1227 : void
1228 23876 : pg_xml_done(PgXmlErrorContext *errcxt, bool isError)
1229 : {
1230 : void *cur_errcxt;
1231 :
1232 : /* An assert seems like enough protection here */
1233 : Assert(errcxt->magic == ERRCXT_MAGIC);
1234 :
1235 : /*
1236 : * In a normal exit, there should be no un-handled libxml errors. But we
1237 : * shouldn't try to enforce this during error recovery, since the longjmp
1238 : * could have been thrown before xml_ereport had a chance to run.
1239 : */
1240 : Assert(!errcxt->err_occurred || isError);
1241 :
1242 : /*
1243 : * Check that libxml's global state is correct, warn if not. This is a
1244 : * real test and not an Assert because it has a higher probability of
1245 : * happening.
1246 : */
1247 : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
1248 23876 : cur_errcxt = xmlStructuredErrorContext;
1249 : #else
1250 : cur_errcxt = xmlGenericErrorContext;
1251 : #endif
1252 :
1253 23876 : if (cur_errcxt != (void *) errcxt)
1254 0 : elog(WARNING, "libxml error handling state is out of sync with xml.c");
1255 :
1256 : /* Restore the saved handlers */
1257 23876 : xmlSetStructuredErrorFunc(errcxt->saved_errcxt, errcxt->saved_errfunc);
1258 23876 : xmlSetExternalEntityLoader(errcxt->saved_entityfunc);
1259 :
1260 : /*
1261 : * Mark the struct as invalid, just in case somebody somehow manages to
1262 : * call xml_errorHandler or xml_ereport with it.
1263 : */
1264 23876 : errcxt->magic = 0;
1265 :
1266 : /* Release memory */
1267 23876 : pfree(errcxt->err_buf.data);
1268 23876 : pfree(errcxt);
1269 23876 : }
1270 :
1271 :
1272 : /*
1273 : * pg_xml_error_occurred() --- test the error flag
1274 : */
1275 : bool
1276 0 : pg_xml_error_occurred(PgXmlErrorContext *errcxt)
1277 : {
1278 0 : return errcxt->err_occurred;
1279 : }
1280 :
1281 :
1282 : /*
1283 : * SQL/XML allows storing "XML documents" or "XML content". "XML
1284 : * documents" are specified by the XML specification and are parsed
1285 : * easily by libxml. "XML content" is specified by SQL/XML as the
1286 : * production "XMLDecl? content". But libxml can only parse the
1287 : * "content" part, so we have to parse the XML declaration ourselves
1288 : * to complete this.
1289 : */
1290 :
1291 : #define CHECK_XML_SPACE(p) \
1292 : do { \
1293 : if (!xmlIsBlank_ch(*(p))) \
1294 : return XML_ERR_SPACE_REQUIRED; \
1295 : } while (0)
1296 :
1297 : #define SKIP_XML_SPACE(p) \
1298 : while (xmlIsBlank_ch(*(p))) (p)++
1299 :
1300 : /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
1301 : /* Beware of multiple evaluations of argument! */
1302 : #define PG_XMLISNAMECHAR(c) \
1303 : (xmlIsBaseChar_ch(c) || xmlIsIdeographicQ(c) \
1304 : || xmlIsDigit_ch(c) \
1305 : || c == '.' || c == '-' || c == '_' || c == ':' \
1306 : || xmlIsCombiningQ(c) \
1307 : || xmlIsExtender_ch(c))
1308 :
1309 : /* pnstrdup, but deal with xmlChar not char; len is measured in xmlChars */
1310 : static xmlChar *
1311 192 : xml_pnstrdup(const xmlChar *str, size_t len)
1312 : {
1313 : xmlChar *result;
1314 :
1315 192 : result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
1316 192 : memcpy(result, str, len * sizeof(xmlChar));
1317 192 : result[len] = 0;
1318 192 : return result;
1319 : }
1320 :
1321 : /* Ditto, except input is char* */
1322 : static xmlChar *
1323 2424 : pg_xmlCharStrndup(const char *str, size_t len)
1324 : {
1325 : xmlChar *result;
1326 :
1327 2424 : result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
1328 2424 : memcpy(result, str, len);
1329 2424 : result[len] = '\0';
1330 :
1331 2424 : return result;
1332 : }
1333 :
1334 : /*
1335 : * Copy xmlChar string to PostgreSQL-owned memory, freeing the input.
1336 : *
1337 : * The input xmlChar is freed regardless of success of the copy.
1338 : */
1339 : static char *
1340 108822 : xml_pstrdup_and_free(xmlChar *str)
1341 : {
1342 : char *result;
1343 :
1344 108822 : if (str)
1345 : {
1346 108822 : PG_TRY();
1347 : {
1348 108822 : result = pstrdup((char *) str);
1349 : }
1350 0 : PG_FINALLY();
1351 : {
1352 108822 : xmlFree(str);
1353 : }
1354 108822 : PG_END_TRY();
1355 : }
1356 : else
1357 0 : result = NULL;
1358 :
1359 108822 : return result;
1360 : }
1361 :
1362 : /*
1363 : * str is the null-terminated input string. Remaining arguments are
1364 : * output arguments; each can be NULL if value is not wanted.
1365 : * version and encoding are returned as locally-palloc'd strings.
1366 : * Result is 0 if OK, an error code if not.
1367 : */
1368 : static int
1369 67600 : parse_xml_decl(const xmlChar *str, size_t *lenp,
1370 : xmlChar **version, xmlChar **encoding, int *standalone)
1371 : {
1372 : const xmlChar *p;
1373 : const xmlChar *save_p;
1374 : size_t len;
1375 : int utf8char;
1376 : int utf8len;
1377 :
1378 : /*
1379 : * Only initialize libxml. We don't need error handling here, but we do
1380 : * need to make sure libxml is initialized before calling any of its
1381 : * functions. Note that this is safe (and a no-op) if caller has already
1382 : * done pg_xml_init().
1383 : */
1384 67600 : pg_xml_init_library();
1385 :
1386 : /* Initialize output arguments to "not present" */
1387 67600 : if (version)
1388 66964 : *version = NULL;
1389 67600 : if (encoding)
1390 0 : *encoding = NULL;
1391 67600 : if (standalone)
1392 66964 : *standalone = -1;
1393 :
1394 67600 : p = str;
1395 :
1396 67600 : if (xmlStrncmp(p, (xmlChar *) "<?xml", 5) != 0)
1397 67378 : goto finished;
1398 :
1399 : /*
1400 : * If next char is a name char, it's a PI like <?xml-stylesheet ...?>
1401 : * rather than an XMLDecl, so we have done what we came to do and found no
1402 : * XMLDecl.
1403 : *
1404 : * We need an input length value for xmlGetUTF8Char, but there's no need
1405 : * to count the whole document size, so use strnlen not strlen.
1406 : */
1407 222 : utf8len = strnlen((const char *) (p + 5), MAX_MULTIBYTE_CHAR_LEN);
1408 222 : utf8char = xmlGetUTF8Char(p + 5, &utf8len);
1409 222 : if (PG_XMLISNAMECHAR(utf8char))
1410 12 : goto finished;
1411 :
1412 210 : p += 5;
1413 :
1414 : /* version */
1415 210 : CHECK_XML_SPACE(p);
1416 420 : SKIP_XML_SPACE(p);
1417 210 : if (xmlStrncmp(p, (xmlChar *) "version", 7) != 0)
1418 0 : return XML_ERR_VERSION_MISSING;
1419 210 : p += 7;
1420 210 : SKIP_XML_SPACE(p);
1421 210 : if (*p != '=')
1422 0 : return XML_ERR_VERSION_MISSING;
1423 210 : p += 1;
1424 210 : SKIP_XML_SPACE(p);
1425 :
1426 210 : if (*p == '\'' || *p == '"')
1427 210 : {
1428 : const xmlChar *q;
1429 :
1430 210 : q = xmlStrchr(p + 1, *p);
1431 210 : if (!q)
1432 0 : return XML_ERR_VERSION_MISSING;
1433 :
1434 210 : if (version)
1435 192 : *version = xml_pnstrdup(p + 1, q - p - 1);
1436 210 : p = q + 1;
1437 : }
1438 : else
1439 0 : return XML_ERR_VERSION_MISSING;
1440 :
1441 : /* encoding */
1442 210 : save_p = p;
1443 372 : SKIP_XML_SPACE(p);
1444 210 : if (xmlStrncmp(p, (xmlChar *) "encoding", 8) == 0)
1445 : {
1446 54 : CHECK_XML_SPACE(save_p);
1447 54 : p += 8;
1448 54 : SKIP_XML_SPACE(p);
1449 54 : if (*p != '=')
1450 0 : return XML_ERR_MISSING_ENCODING;
1451 54 : p += 1;
1452 54 : SKIP_XML_SPACE(p);
1453 :
1454 54 : if (*p == '\'' || *p == '"')
1455 54 : {
1456 : const xmlChar *q;
1457 :
1458 54 : q = xmlStrchr(p + 1, *p);
1459 54 : if (!q)
1460 0 : return XML_ERR_MISSING_ENCODING;
1461 :
1462 54 : if (encoding)
1463 0 : *encoding = xml_pnstrdup(p + 1, q - p - 1);
1464 54 : p = q + 1;
1465 : }
1466 : else
1467 0 : return XML_ERR_MISSING_ENCODING;
1468 : }
1469 : else
1470 : {
1471 156 : p = save_p;
1472 : }
1473 :
1474 : /* standalone */
1475 210 : save_p = p;
1476 318 : SKIP_XML_SPACE(p);
1477 210 : if (xmlStrncmp(p, (xmlChar *) "standalone", 10) == 0)
1478 : {
1479 108 : CHECK_XML_SPACE(save_p);
1480 108 : p += 10;
1481 108 : SKIP_XML_SPACE(p);
1482 108 : if (*p != '=')
1483 0 : return XML_ERR_STANDALONE_VALUE;
1484 108 : p += 1;
1485 108 : SKIP_XML_SPACE(p);
1486 216 : if (xmlStrncmp(p, (xmlChar *) "'yes'", 5) == 0 ||
1487 108 : xmlStrncmp(p, (xmlChar *) "\"yes\"", 5) == 0)
1488 : {
1489 60 : if (standalone)
1490 60 : *standalone = 1;
1491 60 : p += 5;
1492 : }
1493 96 : else if (xmlStrncmp(p, (xmlChar *) "'no'", 4) == 0 ||
1494 48 : xmlStrncmp(p, (xmlChar *) "\"no\"", 4) == 0)
1495 : {
1496 36 : if (standalone)
1497 36 : *standalone = 0;
1498 36 : p += 4;
1499 : }
1500 : else
1501 12 : return XML_ERR_STANDALONE_VALUE;
1502 : }
1503 : else
1504 : {
1505 102 : p = save_p;
1506 : }
1507 :
1508 198 : SKIP_XML_SPACE(p);
1509 198 : if (xmlStrncmp(p, (xmlChar *) "?>", 2) != 0)
1510 0 : return XML_ERR_XMLDECL_NOT_FINISHED;
1511 198 : p += 2;
1512 :
1513 67588 : finished:
1514 67588 : len = p - str;
1515 :
1516 74320 : for (p = str; p < str + len; p++)
1517 6732 : if (*p > 127)
1518 0 : return XML_ERR_INVALID_CHAR;
1519 :
1520 67588 : if (lenp)
1521 67588 : *lenp = len;
1522 :
1523 67588 : return XML_ERR_OK;
1524 : }
1525 :
1526 :
1527 : /*
1528 : * Write an XML declaration. On output, we adjust the XML declaration
1529 : * as follows. (These rules are the moral equivalent of the clause
1530 : * "Serialization of an XML value" in the SQL standard.)
1531 : *
1532 : * We try to avoid generating an XML declaration if possible. This is
1533 : * so that you don't get trivial things like xml '<foo/>' resulting in
1534 : * '<?xml version="1.0"?><foo/>', which would surely be annoying. We
1535 : * must provide a declaration if the standalone property is specified
1536 : * or if we include an encoding declaration. If we have a
1537 : * declaration, we must specify a version (XML requires this).
1538 : * Otherwise we only make a declaration if the version is not "1.0",
1539 : * which is the default version specified in SQL:2003.
1540 : */
1541 : static bool
1542 22878 : print_xml_decl(StringInfo buf, const xmlChar *version,
1543 : pg_enc encoding, int standalone)
1544 : {
1545 22878 : if ((version && strcmp((const char *) version, PG_XML_DEFAULT_VERSION) != 0)
1546 22842 : || (encoding && encoding != PG_UTF8)
1547 22842 : || standalone != -1)
1548 : {
1549 96 : appendStringInfoString(buf, "<?xml");
1550 :
1551 96 : if (version)
1552 72 : appendStringInfo(buf, " version=\"%s\"", version);
1553 : else
1554 24 : appendStringInfo(buf, " version=\"%s\"", PG_XML_DEFAULT_VERSION);
1555 :
1556 96 : if (encoding && encoding != PG_UTF8)
1557 : {
1558 : /*
1559 : * XXX might be useful to convert this to IANA names (ISO-8859-1
1560 : * instead of LATIN1 etc.); needs field experience
1561 : */
1562 0 : appendStringInfo(buf, " encoding=\"%s\"",
1563 : pg_encoding_to_char(encoding));
1564 : }
1565 :
1566 96 : if (standalone == 1)
1567 48 : appendStringInfoString(buf, " standalone=\"yes\"");
1568 48 : else if (standalone == 0)
1569 24 : appendStringInfoString(buf, " standalone=\"no\"");
1570 96 : appendStringInfoString(buf, "?>");
1571 :
1572 96 : return true;
1573 : }
1574 : else
1575 22782 : return false;
1576 : }
1577 :
1578 : /*
1579 : * Test whether an input that is to be parsed as CONTENT contains a DTD.
1580 : *
1581 : * The SQL/XML:2003 definition of CONTENT ("XMLDecl? content") is not
1582 : * satisfied by a document with a DTD, which is a bit of a wart, as it means
1583 : * the CONTENT type is not a proper superset of DOCUMENT. SQL/XML:2006 and
1584 : * later fix that, by redefining content with reference to the "more
1585 : * permissive" Document Node of the XQuery/XPath Data Model, such that any
1586 : * DOCUMENT value is indeed also a CONTENT value. That definition is more
1587 : * useful, as CONTENT becomes usable for parsing input of unknown form (think
1588 : * pg_restore).
1589 : *
1590 : * As used below in parse_xml when parsing for CONTENT, libxml does not give
1591 : * us the 2006+ behavior, but only the 2003; it will choke if the input has
1592 : * a DTD. But we can provide the 2006+ definition of CONTENT easily enough,
1593 : * by detecting this case first and simply doing the parse as DOCUMENT.
1594 : *
1595 : * A DTD can be found arbitrarily far in, but that would be a contrived case;
1596 : * it will ordinarily start within a few dozen characters. The only things
1597 : * that can precede it are an XMLDecl (here, the caller will have called
1598 : * parse_xml_decl already), whitespace, comments, and processing instructions.
1599 : * This function need only return true if it sees a valid sequence of such
1600 : * things leading to <!DOCTYPE. It can simply return false in any other
1601 : * cases, including malformed input; that will mean the input gets parsed as
1602 : * CONTENT as originally planned, with libxml reporting any errors.
1603 : *
1604 : * This is only to be called from xml_parse, when pg_xml_init has already
1605 : * been called. The input is already in UTF8 encoding.
1606 : */
1607 : static bool
1608 930 : xml_doctype_in_content(const xmlChar *str)
1609 : {
1610 930 : const xmlChar *p = str;
1611 :
1612 : for (;;)
1613 36 : {
1614 : const xmlChar *e;
1615 :
1616 1056 : SKIP_XML_SPACE(p);
1617 966 : if (*p != '<')
1618 194 : return false;
1619 772 : p++;
1620 :
1621 772 : if (*p == '!')
1622 : {
1623 72 : p++;
1624 :
1625 : /* if we see <!DOCTYPE, we can return true */
1626 72 : if (xmlStrncmp(p, (xmlChar *) "DOCTYPE", 7) == 0)
1627 42 : return true;
1628 :
1629 : /* otherwise, if it's not a comment, fail */
1630 30 : if (xmlStrncmp(p, (xmlChar *) "--", 2) != 0)
1631 0 : return false;
1632 : /* find end of comment: find -- and a > must follow */
1633 30 : p = xmlStrstr(p + 2, (xmlChar *) "--");
1634 30 : if (!p || p[2] != '>')
1635 0 : return false;
1636 : /* advance over comment, and keep scanning */
1637 30 : p += 3;
1638 30 : continue;
1639 : }
1640 :
1641 : /* otherwise, if it's not a PI <?target something?>, fail */
1642 700 : if (*p != '?')
1643 694 : return false;
1644 6 : p++;
1645 :
1646 : /* find end of PI (the string ?> is forbidden within a PI) */
1647 6 : e = xmlStrstr(p, (xmlChar *) "?>");
1648 6 : if (!e)
1649 0 : return false;
1650 :
1651 : /* advance over PI, keep scanning */
1652 6 : p = e + 2;
1653 : }
1654 : }
1655 :
1656 :
1657 : /*
1658 : * Convert a text object to XML internal representation
1659 : *
1660 : * data is the source data (must not be toasted!), encoding is its encoding,
1661 : * and xmloption_arg and preserve_whitespace are options for the
1662 : * transformation.
1663 : *
1664 : * If parsed_xmloptiontype isn't NULL, *parsed_xmloptiontype is set to the
1665 : * XmlOptionType actually used to parse the input (typically the same as
1666 : * xmloption_arg, but a DOCTYPE node in the input can force DOCUMENT mode).
1667 : *
1668 : * If parsed_nodes isn't NULL and the input is not an XML document, the list
1669 : * of parsed nodes from the xmlParseBalancedChunkMemory call will be returned
1670 : * to *parsed_nodes.
1671 : *
1672 : * Errors normally result in ereport(ERROR), but if escontext is an
1673 : * ErrorSaveContext, then "safe" errors are reported there instead, and the
1674 : * caller must check SOFT_ERROR_OCCURRED() to see whether that happened.
1675 : *
1676 : * Note: it is caller's responsibility to xmlFreeDoc() the result,
1677 : * else a permanent memory leak will ensue! But note the result could
1678 : * be NULL after a soft error.
1679 : *
1680 : * TODO maybe libxml2's xmlreader is better? (do not construct DOM,
1681 : * yet do not use SAX - see xmlreader.c)
1682 : */
1683 : static xmlDocPtr
1684 1230 : xml_parse(text *data, XmlOptionType xmloption_arg,
1685 : bool preserve_whitespace, int encoding,
1686 : XmlOptionType *parsed_xmloptiontype, xmlNodePtr *parsed_nodes,
1687 : Node *escontext)
1688 : {
1689 : int32 len;
1690 : xmlChar *string;
1691 : xmlChar *utf8string;
1692 : PgXmlErrorContext *xmlerrcxt;
1693 1230 : volatile xmlParserCtxtPtr ctxt = NULL;
1694 1230 : volatile xmlDocPtr doc = NULL;
1695 :
1696 : /*
1697 : * This step looks annoyingly redundant, but we must do it to have a
1698 : * null-terminated string in case encoding conversion isn't required.
1699 : */
1700 1230 : len = VARSIZE_ANY_EXHDR(data); /* will be useful later */
1701 1230 : string = xml_text2xmlChar(data);
1702 :
1703 : /*
1704 : * If the data isn't UTF8, we must translate before giving it to libxml.
1705 : *
1706 : * XXX ideally, we'd catch any encoding conversion failure and return a
1707 : * soft error. However, failure to convert to UTF8 should be pretty darn
1708 : * rare, so for now this is left undone.
1709 : */
1710 1230 : utf8string = pg_do_encoding_conversion(string,
1711 : len,
1712 : encoding,
1713 : PG_UTF8);
1714 :
1715 : /* Start up libxml and its parser */
1716 1230 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_WELLFORMED);
1717 :
1718 : /* Use a TRY block to ensure we clean up correctly */
1719 1230 : PG_TRY();
1720 : {
1721 1230 : bool parse_as_document = false;
1722 : int res_code;
1723 1230 : size_t count = 0;
1724 1230 : xmlChar *version = NULL;
1725 1230 : int standalone = 0;
1726 :
1727 : /* Any errors here are reported as hard ereport's */
1728 1230 : xmlInitParser();
1729 :
1730 1230 : ctxt = xmlNewParserCtxt();
1731 1230 : if (ctxt == NULL || xmlerrcxt->err_occurred)
1732 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1733 : "could not allocate parser context");
1734 :
1735 : /* Decide whether to parse as document or content */
1736 1230 : if (xmloption_arg == XMLOPTION_DOCUMENT)
1737 288 : parse_as_document = true;
1738 : else
1739 : {
1740 : /* Parse and skip over the XML declaration, if any */
1741 942 : res_code = parse_xml_decl(utf8string,
1742 : &count, &version, NULL, &standalone);
1743 942 : if (res_code != 0)
1744 : {
1745 12 : errsave(escontext,
1746 : errcode(ERRCODE_INVALID_XML_CONTENT),
1747 : errmsg_internal("invalid XML content: invalid XML declaration"),
1748 : errdetail_for_xml_code(res_code));
1749 12 : goto fail;
1750 : }
1751 :
1752 : /* Is there a DOCTYPE element? */
1753 930 : if (xml_doctype_in_content(utf8string + count))
1754 42 : parse_as_document = true;
1755 : }
1756 :
1757 : /* initialize output parameters */
1758 1218 : if (parsed_xmloptiontype != NULL)
1759 132 : *parsed_xmloptiontype = parse_as_document ? XMLOPTION_DOCUMENT :
1760 : XMLOPTION_CONTENT;
1761 1218 : if (parsed_nodes != NULL)
1762 132 : *parsed_nodes = NULL;
1763 :
1764 1218 : if (parse_as_document)
1765 : {
1766 : /*
1767 : * Note, that here we try to apply DTD defaults
1768 : * (XML_PARSE_DTDATTR) according to SQL/XML:2008 GR 10.16.7.d:
1769 : * 'Default values defined by internal DTD are applied'. As for
1770 : * external DTDs, we try to support them too, (see SQL/XML:2008 GR
1771 : * 10.16.7.e)
1772 : */
1773 330 : doc = xmlCtxtReadDoc(ctxt, utf8string,
1774 : NULL,
1775 : "UTF-8",
1776 : XML_PARSE_NOENT | XML_PARSE_DTDATTR
1777 : | (preserve_whitespace ? 0 : XML_PARSE_NOBLANKS));
1778 330 : if (doc == NULL || xmlerrcxt->err_occurred)
1779 : {
1780 : /* Use original option to decide which error code to report */
1781 144 : if (xmloption_arg == XMLOPTION_DOCUMENT)
1782 138 : xml_errsave(escontext, xmlerrcxt,
1783 : ERRCODE_INVALID_XML_DOCUMENT,
1784 : "invalid XML document");
1785 : else
1786 6 : xml_errsave(escontext, xmlerrcxt,
1787 : ERRCODE_INVALID_XML_CONTENT,
1788 : "invalid XML content");
1789 96 : goto fail;
1790 : }
1791 : }
1792 : else
1793 : {
1794 888 : doc = xmlNewDoc(version);
1795 888 : if (doc == NULL || xmlerrcxt->err_occurred)
1796 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1797 : "could not allocate XML document");
1798 :
1799 : Assert(doc->encoding == NULL);
1800 888 : doc->encoding = xmlStrdup((const xmlChar *) "UTF-8");
1801 888 : if (doc->encoding == NULL || xmlerrcxt->err_occurred)
1802 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
1803 : "could not allocate XML document");
1804 888 : doc->standalone = standalone;
1805 :
1806 : /* allow empty content */
1807 888 : if (*(utf8string + count))
1808 : {
1809 1728 : res_code = xmlParseBalancedChunkMemory(doc, NULL, NULL, 0,
1810 864 : utf8string + count,
1811 : parsed_nodes);
1812 864 : if (res_code != 0 || xmlerrcxt->err_occurred)
1813 : {
1814 60 : xml_errsave(escontext, xmlerrcxt,
1815 : ERRCODE_INVALID_XML_CONTENT,
1816 : "invalid XML content");
1817 12 : goto fail;
1818 : }
1819 : }
1820 : }
1821 :
1822 1134 : fail:
1823 : ;
1824 : }
1825 96 : PG_CATCH();
1826 : {
1827 96 : if (doc != NULL)
1828 48 : xmlFreeDoc(doc);
1829 96 : if (ctxt != NULL)
1830 96 : xmlFreeParserCtxt(ctxt);
1831 :
1832 96 : pg_xml_done(xmlerrcxt, true);
1833 :
1834 96 : PG_RE_THROW();
1835 : }
1836 1134 : PG_END_TRY();
1837 :
1838 1134 : xmlFreeParserCtxt(ctxt);
1839 :
1840 1134 : pg_xml_done(xmlerrcxt, false);
1841 :
1842 1134 : return doc;
1843 : }
1844 :
1845 :
1846 : /*
1847 : * xmlChar<->text conversions
1848 : */
1849 : static xmlChar *
1850 1338 : xml_text2xmlChar(text *in)
1851 : {
1852 1338 : return (xmlChar *) text_to_cstring(in);
1853 : }
1854 :
1855 :
1856 : #ifdef USE_LIBXMLCONTEXT
1857 :
1858 : /*
1859 : * Manage the special context used for all libxml allocations (but only
1860 : * in special debug builds; see notes at top of file)
1861 : */
1862 : static void
1863 : xml_memory_init(void)
1864 : {
1865 : /* Create memory context if not there already */
1866 : if (LibxmlContext == NULL)
1867 : LibxmlContext = AllocSetContextCreate(TopMemoryContext,
1868 : "Libxml context",
1869 : ALLOCSET_DEFAULT_SIZES);
1870 :
1871 : /* Re-establish the callbacks even if already set */
1872 : xmlMemSetup(xml_pfree, xml_palloc, xml_repalloc, xml_pstrdup);
1873 : }
1874 :
1875 : /*
1876 : * Wrappers for memory management functions
1877 : */
1878 : static void *
1879 : xml_palloc(size_t size)
1880 : {
1881 : return MemoryContextAlloc(LibxmlContext, size);
1882 : }
1883 :
1884 :
1885 : static void *
1886 : xml_repalloc(void *ptr, size_t size)
1887 : {
1888 : return repalloc(ptr, size);
1889 : }
1890 :
1891 :
1892 : static void
1893 : xml_pfree(void *ptr)
1894 : {
1895 : /* At least some parts of libxml assume xmlFree(NULL) is allowed */
1896 : if (ptr)
1897 : pfree(ptr);
1898 : }
1899 :
1900 :
1901 : static char *
1902 : xml_pstrdup(const char *string)
1903 : {
1904 : return MemoryContextStrdup(LibxmlContext, string);
1905 : }
1906 : #endif /* USE_LIBXMLCONTEXT */
1907 :
1908 :
1909 : /*
1910 : * xmlPgEntityLoader --- entity loader callback function
1911 : *
1912 : * Silently prevent any external entity URL from being loaded. We don't want
1913 : * to throw an error, so instead make the entity appear to expand to an empty
1914 : * string.
1915 : *
1916 : * We would prefer to allow loading entities that exist in the system's
1917 : * global XML catalog; but the available libxml2 APIs make that a complex
1918 : * and fragile task. For now, just shut down all external access.
1919 : */
1920 : static xmlParserInputPtr
1921 30 : xmlPgEntityLoader(const char *URL, const char *ID,
1922 : xmlParserCtxtPtr ctxt)
1923 : {
1924 30 : return xmlNewStringInputStream(ctxt, (const xmlChar *) "");
1925 : }
1926 :
1927 :
1928 : /*
1929 : * xml_ereport --- report an XML-related error
1930 : *
1931 : * The "msg" is the SQL-level message; some can be adopted from the SQL/XML
1932 : * standard. This function adds libxml's native error message, if any, as
1933 : * detail.
1934 : *
1935 : * This is exported for modules that want to share the core libxml error
1936 : * handler. Note that pg_xml_init() *must* have been called previously.
1937 : */
1938 : void
1939 12 : xml_ereport(PgXmlErrorContext *errcxt, int level, int sqlcode, const char *msg)
1940 : {
1941 : char *detail;
1942 :
1943 : /* Defend against someone passing us a bogus context struct */
1944 12 : if (errcxt->magic != ERRCXT_MAGIC)
1945 0 : elog(ERROR, "xml_ereport called with invalid PgXmlErrorContext");
1946 :
1947 : /* Flag that the current libxml error has been reported */
1948 12 : errcxt->err_occurred = false;
1949 :
1950 : /* Include detail only if we have some text from libxml */
1951 12 : if (errcxt->err_buf.len > 0)
1952 12 : detail = errcxt->err_buf.data;
1953 : else
1954 0 : detail = NULL;
1955 :
1956 12 : ereport(level,
1957 : (errcode(sqlcode),
1958 : errmsg_internal("%s", msg),
1959 : detail ? errdetail_internal("%s", detail) : 0));
1960 0 : }
1961 :
1962 :
1963 : /*
1964 : * xml_errsave --- save an XML-related error
1965 : *
1966 : * If escontext is an ErrorSaveContext, error details are saved into it,
1967 : * and control returns normally.
1968 : *
1969 : * Otherwise, the error is thrown, so that this is equivalent to
1970 : * xml_ereport() with level == ERROR.
1971 : *
1972 : * This should be used only for errors that we're sure we do not need
1973 : * a transaction abort to clean up after.
1974 : */
1975 : static void
1976 204 : xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
1977 : int sqlcode, const char *msg)
1978 : {
1979 : char *detail;
1980 :
1981 : /* Defend against someone passing us a bogus context struct */
1982 204 : if (errcxt->magic != ERRCXT_MAGIC)
1983 0 : elog(ERROR, "xml_errsave called with invalid PgXmlErrorContext");
1984 :
1985 : /* Flag that the current libxml error has been reported */
1986 204 : errcxt->err_occurred = false;
1987 :
1988 : /* Include detail only if we have some text from libxml */
1989 204 : if (errcxt->err_buf.len > 0)
1990 204 : detail = errcxt->err_buf.data;
1991 : else
1992 0 : detail = NULL;
1993 :
1994 204 : errsave(escontext,
1995 : (errcode(sqlcode),
1996 : errmsg_internal("%s", msg),
1997 : detail ? errdetail_internal("%s", detail) : 0));
1998 108 : }
1999 :
2000 :
2001 : /*
2002 : * Error handler for libxml errors and warnings
2003 : */
2004 : static void
2005 398 : xml_errorHandler(void *data, xmlErrorPtr error)
2006 : {
2007 398 : PgXmlErrorContext *xmlerrcxt = (PgXmlErrorContext *) data;
2008 398 : xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) error->ctxt;
2009 398 : xmlParserInputPtr input = (ctxt != NULL) ? ctxt->input : NULL;
2010 398 : xmlNodePtr node = error->node;
2011 398 : const xmlChar *name = (node != NULL &&
2012 398 : node->type == XML_ELEMENT_NODE) ? node->name : NULL;
2013 398 : int domain = error->domain;
2014 398 : int level = error->level;
2015 : StringInfo errorBuf;
2016 :
2017 : /*
2018 : * Defend against someone passing us a bogus context struct.
2019 : *
2020 : * We force a backend exit if this check fails because longjmp'ing out of
2021 : * libxml would likely render it unsafe to use further.
2022 : */
2023 398 : if (xmlerrcxt->magic != ERRCXT_MAGIC)
2024 0 : elog(FATAL, "xml_errorHandler called with invalid PgXmlErrorContext");
2025 :
2026 : /*----------
2027 : * Older libxml versions report some errors differently.
2028 : * First, some errors were previously reported as coming from the parser
2029 : * domain but are now reported as coming from the namespace domain.
2030 : * Second, some warnings were upgraded to errors.
2031 : * We attempt to compensate for that here.
2032 : *----------
2033 : */
2034 398 : switch (error->code)
2035 : {
2036 30 : case XML_WAR_NS_URI:
2037 30 : level = XML_ERR_ERROR;
2038 30 : domain = XML_FROM_NAMESPACE;
2039 30 : break;
2040 :
2041 54 : case XML_ERR_NS_DECL_ERROR:
2042 : case XML_WAR_NS_URI_RELATIVE:
2043 : case XML_WAR_NS_COLUMN:
2044 : case XML_NS_ERR_XML_NAMESPACE:
2045 : case XML_NS_ERR_UNDEFINED_NAMESPACE:
2046 : case XML_NS_ERR_QNAME:
2047 : case XML_NS_ERR_ATTRIBUTE_REDEFINED:
2048 : case XML_NS_ERR_EMPTY:
2049 54 : domain = XML_FROM_NAMESPACE;
2050 54 : break;
2051 : }
2052 :
2053 : /* Decide whether to act on the error or not */
2054 398 : switch (domain)
2055 : {
2056 314 : case XML_FROM_PARSER:
2057 : case XML_FROM_NONE:
2058 : case XML_FROM_MEMORY:
2059 : case XML_FROM_IO:
2060 :
2061 : /*
2062 : * Suppress warnings about undeclared entities. We need to do
2063 : * this to avoid problems due to not loading DTD definitions.
2064 : */
2065 314 : if (error->code == XML_WAR_UNDECLARED_ENTITY)
2066 6 : return;
2067 :
2068 : /* Otherwise, accept error regardless of the parsing purpose */
2069 308 : break;
2070 :
2071 84 : default:
2072 : /* Ignore error if only doing well-formedness check */
2073 84 : if (xmlerrcxt->strictness == PG_XML_STRICTNESS_WELLFORMED)
2074 66 : return;
2075 18 : break;
2076 : }
2077 :
2078 : /* Prepare error message in errorBuf */
2079 326 : errorBuf = makeStringInfo();
2080 :
2081 326 : if (error->line > 0)
2082 326 : appendStringInfo(errorBuf, "line %d: ", error->line);
2083 326 : if (name != NULL)
2084 0 : appendStringInfo(errorBuf, "element %s: ", name);
2085 326 : if (error->message != NULL)
2086 326 : appendStringInfoString(errorBuf, error->message);
2087 : else
2088 0 : appendStringInfoString(errorBuf, "(no message provided)");
2089 :
2090 : /*
2091 : * Append context information to errorBuf.
2092 : *
2093 : * xmlParserPrintFileContext() uses libxml's "generic" error handler to
2094 : * write the context. Since we don't want to duplicate libxml
2095 : * functionality here, we set up a generic error handler temporarily.
2096 : *
2097 : * We use appendStringInfo() directly as libxml's generic error handler.
2098 : * This should work because it has essentially the same signature as
2099 : * libxml expects, namely (void *ptr, const char *msg, ...).
2100 : */
2101 326 : if (input != NULL)
2102 : {
2103 326 : xmlGenericErrorFunc errFuncSaved = xmlGenericError;
2104 326 : void *errCtxSaved = xmlGenericErrorContext;
2105 :
2106 326 : xmlSetGenericErrorFunc((void *) errorBuf,
2107 : (xmlGenericErrorFunc) appendStringInfo);
2108 :
2109 : /* Add context information to errorBuf */
2110 326 : appendStringInfoLineSeparator(errorBuf);
2111 :
2112 326 : xmlParserPrintFileContext(input);
2113 :
2114 : /* Restore generic error func */
2115 326 : xmlSetGenericErrorFunc(errCtxSaved, errFuncSaved);
2116 : }
2117 :
2118 : /* Get rid of any trailing newlines in errorBuf */
2119 326 : chopStringInfoNewlines(errorBuf);
2120 :
2121 : /*
2122 : * Legacy error handling mode. err_occurred is never set, we just add the
2123 : * message to err_buf. This mode exists because the xml2 contrib module
2124 : * uses our error-handling infrastructure, but we don't want to change its
2125 : * behaviour since it's deprecated anyway. This is also why we don't
2126 : * distinguish between notices, warnings and errors here --- the old-style
2127 : * generic error handler wouldn't have done that either.
2128 : */
2129 326 : if (xmlerrcxt->strictness == PG_XML_STRICTNESS_LEGACY)
2130 : {
2131 2 : appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
2132 2 : appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
2133 : errorBuf->len);
2134 :
2135 2 : pfree(errorBuf->data);
2136 2 : pfree(errorBuf);
2137 2 : return;
2138 : }
2139 :
2140 : /*
2141 : * We don't want to ereport() here because that'd probably leave libxml in
2142 : * an inconsistent state. Instead, we remember the error and ereport()
2143 : * from xml_ereport().
2144 : *
2145 : * Warnings and notices can be reported immediately since they won't cause
2146 : * a longjmp() out of libxml.
2147 : */
2148 324 : if (level >= XML_ERR_ERROR)
2149 : {
2150 318 : appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
2151 318 : appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
2152 : errorBuf->len);
2153 :
2154 318 : xmlerrcxt->err_occurred = true;
2155 : }
2156 6 : else if (level >= XML_ERR_WARNING)
2157 : {
2158 6 : ereport(WARNING,
2159 : (errmsg_internal("%s", errorBuf->data)));
2160 : }
2161 : else
2162 : {
2163 0 : ereport(NOTICE,
2164 : (errmsg_internal("%s", errorBuf->data)));
2165 : }
2166 :
2167 324 : pfree(errorBuf->data);
2168 324 : pfree(errorBuf);
2169 : }
2170 :
2171 :
2172 : /*
2173 : * Convert libxml error codes into textual errdetail messages.
2174 : *
2175 : * This should be called within an ereport or errsave invocation,
2176 : * just as errdetail would be.
2177 : *
2178 : * At the moment, we only need to cover those codes that we
2179 : * may raise in this file.
2180 : */
2181 : static int
2182 6 : errdetail_for_xml_code(int code)
2183 : {
2184 : const char *det;
2185 :
2186 6 : switch (code)
2187 : {
2188 0 : case XML_ERR_INVALID_CHAR:
2189 0 : det = gettext_noop("Invalid character value.");
2190 0 : break;
2191 0 : case XML_ERR_SPACE_REQUIRED:
2192 0 : det = gettext_noop("Space required.");
2193 0 : break;
2194 6 : case XML_ERR_STANDALONE_VALUE:
2195 6 : det = gettext_noop("standalone accepts only 'yes' or 'no'.");
2196 6 : break;
2197 0 : case XML_ERR_VERSION_MISSING:
2198 0 : det = gettext_noop("Malformed declaration: missing version.");
2199 0 : break;
2200 0 : case XML_ERR_MISSING_ENCODING:
2201 0 : det = gettext_noop("Missing encoding in text declaration.");
2202 0 : break;
2203 0 : case XML_ERR_XMLDECL_NOT_FINISHED:
2204 0 : det = gettext_noop("Parsing XML declaration: '?>' expected.");
2205 0 : break;
2206 0 : default:
2207 0 : det = gettext_noop("Unrecognized libxml error code: %d.");
2208 0 : break;
2209 : }
2210 :
2211 6 : return errdetail(det, code);
2212 : }
2213 :
2214 :
2215 : /*
2216 : * Remove all trailing newlines from a StringInfo string
2217 : */
2218 : static void
2219 972 : chopStringInfoNewlines(StringInfo str)
2220 : {
2221 1624 : while (str->len > 0 && str->data[str->len - 1] == '\n')
2222 652 : str->data[--str->len] = '\0';
2223 972 : }
2224 :
2225 :
2226 : /*
2227 : * Append a newline after removing any existing trailing newlines
2228 : */
2229 : static void
2230 646 : appendStringInfoLineSeparator(StringInfo str)
2231 : {
2232 646 : chopStringInfoNewlines(str);
2233 646 : if (str->len > 0)
2234 428 : appendStringInfoChar(str, '\n');
2235 646 : }
2236 :
2237 :
2238 : /*
2239 : * Convert one char in the current server encoding to a Unicode codepoint.
2240 : */
2241 : static pg_wchar
2242 18280 : sqlchar_to_unicode(const char *s)
2243 : {
2244 : char *utf8string;
2245 : pg_wchar ret[2]; /* need space for trailing zero */
2246 :
2247 : /* note we're not assuming s is null-terminated */
2248 18280 : utf8string = pg_server_to_any(s, pg_mblen(s), PG_UTF8);
2249 :
2250 18280 : pg_encoding_mb2wchar_with_len(PG_UTF8, utf8string, ret,
2251 : pg_encoding_mblen(PG_UTF8, utf8string));
2252 :
2253 18280 : if (utf8string != s)
2254 0 : pfree(utf8string);
2255 :
2256 18280 : return ret[0];
2257 : }
2258 :
2259 :
2260 : static bool
2261 3638 : is_valid_xml_namefirst(pg_wchar c)
2262 : {
2263 : /* (Letter | '_' | ':') */
2264 3644 : return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
2265 7282 : || c == '_' || c == ':');
2266 : }
2267 :
2268 :
2269 : static bool
2270 14642 : is_valid_xml_namechar(pg_wchar c)
2271 : {
2272 : /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
2273 15532 : return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
2274 890 : || xmlIsDigitQ(c)
2275 254 : || c == '.' || c == '-' || c == '_' || c == ':'
2276 12 : || xmlIsCombiningQ(c)
2277 31064 : || xmlIsExtenderQ(c));
2278 : }
2279 : #endif /* USE_LIBXML */
2280 :
2281 :
2282 : /*
2283 : * Map SQL identifier to XML name; see SQL/XML:2008 section 9.1.
2284 : */
2285 : char *
2286 3652 : map_sql_identifier_to_xml_name(const char *ident, bool fully_escaped,
2287 : bool escape_period)
2288 : {
2289 : #ifdef USE_LIBXML
2290 : StringInfoData buf;
2291 : const char *p;
2292 :
2293 : /*
2294 : * SQL/XML doesn't make use of this case anywhere, so it's probably a
2295 : * mistake.
2296 : */
2297 : Assert(fully_escaped || !escape_period);
2298 :
2299 3652 : initStringInfo(&buf);
2300 :
2301 21952 : for (p = ident; *p; p += pg_mblen(p))
2302 : {
2303 18300 : if (*p == ':' && (p == ident || fully_escaped))
2304 14 : appendStringInfoString(&buf, "_x003A_");
2305 18286 : else if (*p == '_' && *(p + 1) == 'x')
2306 6 : appendStringInfoString(&buf, "_x005F_");
2307 21568 : else if (fully_escaped && p == ident &&
2308 3288 : pg_strncasecmp(p, "xml", 3) == 0)
2309 : {
2310 0 : if (*p == 'x')
2311 0 : appendStringInfoString(&buf, "_x0078_");
2312 : else
2313 0 : appendStringInfoString(&buf, "_x0058_");
2314 : }
2315 18280 : else if (escape_period && *p == '.')
2316 0 : appendStringInfoString(&buf, "_x002E_");
2317 : else
2318 : {
2319 18280 : pg_wchar u = sqlchar_to_unicode(p);
2320 :
2321 36560 : if ((p == ident)
2322 3638 : ? !is_valid_xml_namefirst(u)
2323 14642 : : !is_valid_xml_namechar(u))
2324 18 : appendStringInfo(&buf, "_x%04X_", (unsigned int) u);
2325 : else
2326 18262 : appendBinaryStringInfo(&buf, p, pg_mblen(p));
2327 : }
2328 : }
2329 :
2330 3652 : return buf.data;
2331 : #else /* not USE_LIBXML */
2332 : NO_XML_SUPPORT();
2333 : return NULL;
2334 : #endif /* not USE_LIBXML */
2335 : }
2336 :
2337 :
2338 : /*
2339 : * Map XML name to SQL identifier; see SQL/XML:2008 section 9.3.
2340 : */
2341 : char *
2342 128 : map_xml_name_to_sql_identifier(const char *name)
2343 : {
2344 : StringInfoData buf;
2345 : const char *p;
2346 :
2347 128 : initStringInfo(&buf);
2348 :
2349 704 : for (p = name; *p; p += pg_mblen(p))
2350 : {
2351 576 : if (*p == '_' && *(p + 1) == 'x'
2352 16 : && isxdigit((unsigned char) *(p + 2))
2353 16 : && isxdigit((unsigned char) *(p + 3))
2354 16 : && isxdigit((unsigned char) *(p + 4))
2355 16 : && isxdigit((unsigned char) *(p + 5))
2356 16 : && *(p + 6) == '_')
2357 16 : {
2358 : char cbuf[MAX_UNICODE_EQUIVALENT_STRING + 1];
2359 : unsigned int u;
2360 :
2361 16 : sscanf(p + 2, "%X", &u);
2362 16 : pg_unicode_to_server(u, (unsigned char *) cbuf);
2363 16 : appendStringInfoString(&buf, cbuf);
2364 16 : p += 6;
2365 : }
2366 : else
2367 560 : appendBinaryStringInfo(&buf, p, pg_mblen(p));
2368 : }
2369 :
2370 128 : return buf.data;
2371 : }
2372 :
2373 : /*
2374 : * Map SQL value to XML value; see SQL/XML:2008 section 9.8.
2375 : *
2376 : * When xml_escape_strings is true, then certain characters in string
2377 : * values are replaced by entity references (< etc.), as specified
2378 : * in SQL/XML:2008 section 9.8 GR 9) a) iii). This is normally what is
2379 : * wanted. The false case is mainly useful when the resulting value
2380 : * is used with xmlTextWriterWriteAttribute() to write out an
2381 : * attribute, because that function does the escaping itself.
2382 : */
2383 : char *
2384 130166 : map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
2385 : {
2386 130166 : if (type_is_array_domain(type))
2387 : {
2388 : ArrayType *array;
2389 : Oid elmtype;
2390 : int16 elmlen;
2391 : bool elmbyval;
2392 : char elmalign;
2393 : int num_elems;
2394 : Datum *elem_values;
2395 : bool *elem_nulls;
2396 : StringInfoData buf;
2397 : int i;
2398 :
2399 6 : array = DatumGetArrayTypeP(value);
2400 6 : elmtype = ARR_ELEMTYPE(array);
2401 6 : get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);
2402 :
2403 6 : deconstruct_array(array, elmtype,
2404 : elmlen, elmbyval, elmalign,
2405 : &elem_values, &elem_nulls,
2406 : &num_elems);
2407 :
2408 6 : initStringInfo(&buf);
2409 :
2410 24 : for (i = 0; i < num_elems; i++)
2411 : {
2412 18 : if (elem_nulls[i])
2413 0 : continue;
2414 18 : appendStringInfoString(&buf, "<element>");
2415 18 : appendStringInfoString(&buf,
2416 18 : map_sql_value_to_xml_value(elem_values[i],
2417 : elmtype, true));
2418 18 : appendStringInfoString(&buf, "</element>");
2419 : }
2420 :
2421 6 : pfree(elem_values);
2422 6 : pfree(elem_nulls);
2423 :
2424 6 : return buf.data;
2425 : }
2426 : else
2427 : {
2428 : Oid typeOut;
2429 : bool isvarlena;
2430 : char *str;
2431 :
2432 : /*
2433 : * Flatten domains; the special-case treatments below should apply to,
2434 : * eg, domains over boolean not just boolean.
2435 : */
2436 130160 : type = getBaseType(type);
2437 :
2438 : /*
2439 : * Special XSD formatting for some data types
2440 : */
2441 130160 : switch (type)
2442 : {
2443 66 : case BOOLOID:
2444 66 : if (DatumGetBool(value))
2445 60 : return "true";
2446 : else
2447 6 : return "false";
2448 :
2449 48 : case DATEOID:
2450 : {
2451 : DateADT date;
2452 : struct pg_tm tm;
2453 : char buf[MAXDATELEN + 1];
2454 :
2455 48 : date = DatumGetDateADT(value);
2456 : /* XSD doesn't support infinite values */
2457 48 : if (DATE_NOT_FINITE(date))
2458 0 : ereport(ERROR,
2459 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2460 : errmsg("date out of range"),
2461 : errdetail("XML does not support infinite date values.")));
2462 48 : j2date(date + POSTGRES_EPOCH_JDATE,
2463 : &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
2464 48 : EncodeDateOnly(&tm, USE_XSD_DATES, buf);
2465 :
2466 48 : return pstrdup(buf);
2467 : }
2468 :
2469 36 : case TIMESTAMPOID:
2470 : {
2471 : Timestamp timestamp;
2472 : struct pg_tm tm;
2473 : fsec_t fsec;
2474 : char buf[MAXDATELEN + 1];
2475 :
2476 36 : timestamp = DatumGetTimestamp(value);
2477 :
2478 : /* XSD doesn't support infinite values */
2479 36 : if (TIMESTAMP_NOT_FINITE(timestamp))
2480 6 : ereport(ERROR,
2481 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2482 : errmsg("timestamp out of range"),
2483 : errdetail("XML does not support infinite timestamp values.")));
2484 30 : else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
2485 30 : EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
2486 : else
2487 0 : ereport(ERROR,
2488 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2489 : errmsg("timestamp out of range")));
2490 :
2491 30 : return pstrdup(buf);
2492 : }
2493 :
2494 24 : case TIMESTAMPTZOID:
2495 : {
2496 : TimestampTz timestamp;
2497 : struct pg_tm tm;
2498 : int tz;
2499 : fsec_t fsec;
2500 24 : const char *tzn = NULL;
2501 : char buf[MAXDATELEN + 1];
2502 :
2503 24 : timestamp = DatumGetTimestamp(value);
2504 :
2505 : /* XSD doesn't support infinite values */
2506 24 : if (TIMESTAMP_NOT_FINITE(timestamp))
2507 0 : ereport(ERROR,
2508 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2509 : errmsg("timestamp out of range"),
2510 : errdetail("XML does not support infinite timestamp values.")));
2511 24 : else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
2512 24 : EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
2513 : else
2514 0 : ereport(ERROR,
2515 : (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
2516 : errmsg("timestamp out of range")));
2517 :
2518 24 : return pstrdup(buf);
2519 : }
2520 :
2521 : #ifdef USE_LIBXML
2522 36 : case BYTEAOID:
2523 : {
2524 36 : bytea *bstr = DatumGetByteaPP(value);
2525 : PgXmlErrorContext *xmlerrcxt;
2526 36 : volatile xmlBufferPtr buf = NULL;
2527 36 : volatile xmlTextWriterPtr writer = NULL;
2528 : char *result;
2529 :
2530 36 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
2531 :
2532 36 : PG_TRY();
2533 : {
2534 36 : buf = xmlBufferCreate();
2535 36 : if (buf == NULL || xmlerrcxt->err_occurred)
2536 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
2537 : "could not allocate xmlBuffer");
2538 36 : writer = xmlNewTextWriterMemory(buf, 0);
2539 36 : if (writer == NULL || xmlerrcxt->err_occurred)
2540 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
2541 : "could not allocate xmlTextWriter");
2542 :
2543 36 : if (xmlbinary == XMLBINARY_BASE64)
2544 30 : xmlTextWriterWriteBase64(writer, VARDATA_ANY(bstr),
2545 30 : 0, VARSIZE_ANY_EXHDR(bstr));
2546 : else
2547 6 : xmlTextWriterWriteBinHex(writer, VARDATA_ANY(bstr),
2548 6 : 0, VARSIZE_ANY_EXHDR(bstr));
2549 :
2550 : /* we MUST do this now to flush data out to the buffer */
2551 36 : xmlFreeTextWriter(writer);
2552 36 : writer = NULL;
2553 :
2554 36 : result = pstrdup((const char *) xmlBufferContent(buf));
2555 : }
2556 0 : PG_CATCH();
2557 : {
2558 0 : if (writer)
2559 0 : xmlFreeTextWriter(writer);
2560 0 : if (buf)
2561 0 : xmlBufferFree(buf);
2562 :
2563 0 : pg_xml_done(xmlerrcxt, true);
2564 :
2565 0 : PG_RE_THROW();
2566 : }
2567 36 : PG_END_TRY();
2568 :
2569 36 : xmlBufferFree(buf);
2570 :
2571 36 : pg_xml_done(xmlerrcxt, false);
2572 :
2573 36 : return result;
2574 : }
2575 : #endif /* USE_LIBXML */
2576 :
2577 : }
2578 :
2579 : /*
2580 : * otherwise, just use the type's native text representation
2581 : */
2582 129950 : getTypeOutputInfo(type, &typeOut, &isvarlena);
2583 129950 : str = OidOutputFunctionCall(typeOut, value);
2584 :
2585 : /* ... exactly as-is for XML, and when escaping is not wanted */
2586 129950 : if (type == XMLOID || !xml_escape_strings)
2587 21614 : return str;
2588 :
2589 : /* otherwise, translate special characters as needed */
2590 108336 : return escape_xml(str);
2591 : }
2592 : }
2593 :
2594 :
2595 : /*
2596 : * Escape characters in text that have special meanings in XML.
2597 : *
2598 : * Returns a palloc'd string.
2599 : *
2600 : * NB: this is intentionally not dependent on libxml.
2601 : */
2602 : char *
2603 108582 : escape_xml(const char *str)
2604 : {
2605 : StringInfoData buf;
2606 : const char *p;
2607 :
2608 108582 : initStringInfo(&buf);
2609 670924 : for (p = str; *p; p++)
2610 : {
2611 562342 : switch (*p)
2612 : {
2613 0 : case '&':
2614 0 : appendStringInfoString(&buf, "&");
2615 0 : break;
2616 36 : case '<':
2617 36 : appendStringInfoString(&buf, "<");
2618 36 : break;
2619 24 : case '>':
2620 24 : appendStringInfoString(&buf, ">");
2621 24 : break;
2622 0 : case '\r':
2623 0 : appendStringInfoString(&buf, "
");
2624 0 : break;
2625 562282 : default:
2626 562282 : appendStringInfoCharMacro(&buf, *p);
2627 562282 : break;
2628 : }
2629 : }
2630 108582 : return buf.data;
2631 : }
2632 :
2633 :
2634 : static char *
2635 24 : _SPI_strdup(const char *s)
2636 : {
2637 24 : size_t len = strlen(s) + 1;
2638 24 : char *ret = SPI_palloc(len);
2639 :
2640 24 : memcpy(ret, s, len);
2641 24 : return ret;
2642 : }
2643 :
2644 :
2645 : /*
2646 : * SQL to XML mapping functions
2647 : *
2648 : * What follows below was at one point intentionally organized so that
2649 : * you can read along in the SQL/XML standard. The functions are
2650 : * mostly split up the way the clauses lay out in the standards
2651 : * document, and the identifiers are also aligned with the standard
2652 : * text. Unfortunately, SQL/XML:2006 reordered the clauses
2653 : * differently than SQL/XML:2003, so the order below doesn't make much
2654 : * sense anymore.
2655 : *
2656 : * There are many things going on there:
2657 : *
2658 : * There are two kinds of mappings: Mapping SQL data (table contents)
2659 : * to XML documents, and mapping SQL structure (the "schema") to XML
2660 : * Schema. And there are functions that do both at the same time.
2661 : *
2662 : * Then you can map a database, a schema, or a table, each in both
2663 : * ways. This breaks down recursively: Mapping a database invokes
2664 : * mapping schemas, which invokes mapping tables, which invokes
2665 : * mapping rows, which invokes mapping columns, although you can't
2666 : * call the last two from the outside. Because of this, there are a
2667 : * number of xyz_internal() functions which are to be called both from
2668 : * the function manager wrapper and from some upper layer in a
2669 : * recursive call.
2670 : *
2671 : * See the documentation about what the common function arguments
2672 : * nulls, tableforest, and targetns mean.
2673 : *
2674 : * Some style guidelines for XML output: Use double quotes for quoting
2675 : * XML attributes. Indent XML elements by two spaces, but remember
2676 : * that a lot of code is called recursively at different levels, so
2677 : * it's better not to indent rather than create output that indents
2678 : * and outdents weirdly. Add newlines to make the output look nice.
2679 : */
2680 :
2681 :
2682 : /*
2683 : * Visibility of objects for XML mappings; see SQL/XML:2008 section
2684 : * 4.10.8.
2685 : */
2686 :
2687 : /*
2688 : * Given a query, which must return type oid as first column, produce
2689 : * a list of Oids with the query results.
2690 : */
2691 : static List *
2692 36 : query_to_oid_list(const char *query)
2693 : {
2694 : uint64 i;
2695 36 : List *list = NIL;
2696 : int spi_result;
2697 :
2698 36 : spi_result = SPI_execute(query, true, 0);
2699 36 : if (spi_result != SPI_OK_SELECT)
2700 0 : elog(ERROR, "SPI_execute returned %s for %s",
2701 : SPI_result_code_string(spi_result), query);
2702 :
2703 108 : for (i = 0; i < SPI_processed; i++)
2704 : {
2705 : Datum oid;
2706 : bool isnull;
2707 :
2708 72 : oid = SPI_getbinval(SPI_tuptable->vals[i],
2709 72 : SPI_tuptable->tupdesc,
2710 : 1,
2711 : &isnull);
2712 72 : if (!isnull)
2713 72 : list = lappend_oid(list, DatumGetObjectId(oid));
2714 : }
2715 :
2716 36 : return list;
2717 : }
2718 :
2719 :
2720 : static List *
2721 36 : schema_get_xml_visible_tables(Oid nspid)
2722 : {
2723 : StringInfoData query;
2724 :
2725 36 : initStringInfo(&query);
2726 36 : appendStringInfo(&query, "SELECT oid FROM pg_catalog.pg_class"
2727 : " WHERE relnamespace = %u AND relkind IN ("
2728 : CppAsString2(RELKIND_RELATION) ","
2729 : CppAsString2(RELKIND_MATVIEW) ","
2730 : CppAsString2(RELKIND_VIEW) ")"
2731 : " AND pg_catalog.has_table_privilege (oid, 'SELECT')"
2732 : " ORDER BY relname;", nspid);
2733 :
2734 36 : return query_to_oid_list(query.data);
2735 : }
2736 :
2737 :
2738 : /*
2739 : * Including the system schemas is probably not useful for a database
2740 : * mapping.
2741 : */
2742 : #define XML_VISIBLE_SCHEMAS_EXCLUDE "(nspname ~ '^pg_' OR nspname = 'information_schema')"
2743 :
2744 : #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
2745 :
2746 :
2747 : static List *
2748 0 : database_get_xml_visible_schemas(void)
2749 : {
2750 0 : return query_to_oid_list(XML_VISIBLE_SCHEMAS " ORDER BY nspname;");
2751 : }
2752 :
2753 :
2754 : static List *
2755 0 : database_get_xml_visible_tables(void)
2756 : {
2757 : /* At the moment there is no order required here. */
2758 0 : return query_to_oid_list("SELECT oid FROM pg_catalog.pg_class"
2759 : " WHERE relkind IN ("
2760 : CppAsString2(RELKIND_RELATION) ","
2761 : CppAsString2(RELKIND_MATVIEW) ","
2762 : CppAsString2(RELKIND_VIEW) ")"
2763 : " AND pg_catalog.has_table_privilege(pg_class.oid, 'SELECT')"
2764 : " AND relnamespace IN (" XML_VISIBLE_SCHEMAS ");");
2765 : }
2766 :
2767 :
2768 : /*
2769 : * Map SQL table to XML and/or XML Schema document; see SQL/XML:2008
2770 : * section 9.11.
2771 : */
2772 :
2773 : static StringInfo
2774 96 : table_to_xml_internal(Oid relid,
2775 : const char *xmlschema, bool nulls, bool tableforest,
2776 : const char *targetns, bool top_level)
2777 : {
2778 : StringInfoData query;
2779 :
2780 96 : initStringInfo(&query);
2781 96 : appendStringInfo(&query, "SELECT * FROM %s",
2782 : DatumGetCString(DirectFunctionCall1(regclassout,
2783 : ObjectIdGetDatum(relid))));
2784 96 : return query_to_xml_internal(query.data, get_rel_name(relid),
2785 : xmlschema, nulls, tableforest,
2786 : targetns, top_level);
2787 : }
2788 :
2789 :
2790 : Datum
2791 36 : table_to_xml(PG_FUNCTION_ARGS)
2792 : {
2793 36 : Oid relid = PG_GETARG_OID(0);
2794 36 : bool nulls = PG_GETARG_BOOL(1);
2795 36 : bool tableforest = PG_GETARG_BOOL(2);
2796 36 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2797 :
2798 36 : PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid, NULL,
2799 : nulls, tableforest,
2800 : targetns, true)));
2801 : }
2802 :
2803 :
2804 : Datum
2805 10 : query_to_xml(PG_FUNCTION_ARGS)
2806 : {
2807 10 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
2808 10 : bool nulls = PG_GETARG_BOOL(1);
2809 10 : bool tableforest = PG_GETARG_BOOL(2);
2810 10 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2811 :
2812 10 : PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
2813 : NULL, nulls, tableforest,
2814 : targetns, true)));
2815 : }
2816 :
2817 :
2818 : Datum
2819 12 : cursor_to_xml(PG_FUNCTION_ARGS)
2820 : {
2821 12 : char *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
2822 12 : int32 count = PG_GETARG_INT32(1);
2823 12 : bool nulls = PG_GETARG_BOOL(2);
2824 12 : bool tableforest = PG_GETARG_BOOL(3);
2825 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(4));
2826 :
2827 : StringInfoData result;
2828 : Portal portal;
2829 : uint64 i;
2830 :
2831 12 : initStringInfo(&result);
2832 :
2833 12 : if (!tableforest)
2834 : {
2835 6 : xmldata_root_element_start(&result, "table", NULL, targetns, true);
2836 6 : appendStringInfoChar(&result, '\n');
2837 : }
2838 :
2839 12 : SPI_connect();
2840 12 : portal = SPI_cursor_find(name);
2841 12 : if (portal == NULL)
2842 0 : ereport(ERROR,
2843 : (errcode(ERRCODE_UNDEFINED_CURSOR),
2844 : errmsg("cursor \"%s\" does not exist", name)));
2845 :
2846 12 : SPI_cursor_fetch(portal, true, count);
2847 48 : for (i = 0; i < SPI_processed; i++)
2848 36 : SPI_sql_row_to_xmlelement(i, &result, NULL, nulls,
2849 : tableforest, targetns, true);
2850 :
2851 12 : SPI_finish();
2852 :
2853 12 : if (!tableforest)
2854 6 : xmldata_root_element_end(&result, "table");
2855 :
2856 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(&result));
2857 : }
2858 :
2859 :
2860 : /*
2861 : * Write the start tag of the root element of a data mapping.
2862 : *
2863 : * top_level means that this is the very top level of the eventual
2864 : * output. For example, when the user calls table_to_xml, then a call
2865 : * with a table name to this function is the top level. When the user
2866 : * calls database_to_xml, then a call with a schema name to this
2867 : * function is not the top level. If top_level is false, then the XML
2868 : * namespace declarations are omitted, because they supposedly already
2869 : * appeared earlier in the output. Repeating them is not wrong, but
2870 : * it looks ugly.
2871 : */
2872 : static void
2873 238 : xmldata_root_element_start(StringInfo result, const char *eltname,
2874 : const char *xmlschema, const char *targetns,
2875 : bool top_level)
2876 : {
2877 : /* This isn't really wrong but currently makes no sense. */
2878 : Assert(top_level || !xmlschema);
2879 :
2880 238 : appendStringInfo(result, "<%s", eltname);
2881 238 : if (top_level)
2882 : {
2883 178 : appendStringInfoString(result, " xmlns:xsi=\"" NAMESPACE_XSI "\"");
2884 178 : if (strlen(targetns) > 0)
2885 30 : appendStringInfo(result, " xmlns=\"%s\"", targetns);
2886 : }
2887 238 : if (xmlschema)
2888 : {
2889 : /* FIXME: better targets */
2890 18 : if (strlen(targetns) > 0)
2891 6 : appendStringInfo(result, " xsi:schemaLocation=\"%s #\"", targetns);
2892 : else
2893 12 : appendStringInfoString(result, " xsi:noNamespaceSchemaLocation=\"#\"");
2894 : }
2895 238 : appendStringInfoString(result, ">\n");
2896 238 : }
2897 :
2898 :
2899 : static void
2900 238 : xmldata_root_element_end(StringInfo result, const char *eltname)
2901 : {
2902 238 : appendStringInfo(result, "</%s>\n", eltname);
2903 238 : }
2904 :
2905 :
2906 : static StringInfo
2907 112 : query_to_xml_internal(const char *query, char *tablename,
2908 : const char *xmlschema, bool nulls, bool tableforest,
2909 : const char *targetns, bool top_level)
2910 : {
2911 : StringInfo result;
2912 : char *xmltn;
2913 : uint64 i;
2914 :
2915 112 : if (tablename)
2916 96 : xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
2917 : else
2918 16 : xmltn = "table";
2919 :
2920 112 : result = makeStringInfo();
2921 :
2922 112 : SPI_connect();
2923 112 : if (SPI_execute(query, true, 0) != SPI_OK_SELECT)
2924 0 : ereport(ERROR,
2925 : (errcode(ERRCODE_DATA_EXCEPTION),
2926 : errmsg("invalid query")));
2927 :
2928 112 : if (!tableforest)
2929 : {
2930 52 : xmldata_root_element_start(result, xmltn, xmlschema,
2931 : targetns, top_level);
2932 52 : appendStringInfoChar(result, '\n');
2933 : }
2934 :
2935 112 : if (xmlschema)
2936 30 : appendStringInfo(result, "%s\n\n", xmlschema);
2937 :
2938 388 : for (i = 0; i < SPI_processed; i++)
2939 276 : SPI_sql_row_to_xmlelement(i, result, tablename, nulls,
2940 : tableforest, targetns, top_level);
2941 :
2942 112 : if (!tableforest)
2943 52 : xmldata_root_element_end(result, xmltn);
2944 :
2945 112 : SPI_finish();
2946 :
2947 112 : return result;
2948 : }
2949 :
2950 :
2951 : Datum
2952 30 : table_to_xmlschema(PG_FUNCTION_ARGS)
2953 : {
2954 30 : Oid relid = PG_GETARG_OID(0);
2955 30 : bool nulls = PG_GETARG_BOOL(1);
2956 30 : bool tableforest = PG_GETARG_BOOL(2);
2957 30 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2958 : const char *result;
2959 : Relation rel;
2960 :
2961 30 : rel = table_open(relid, AccessShareLock);
2962 30 : result = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
2963 : tableforest, targetns);
2964 30 : table_close(rel, NoLock);
2965 :
2966 30 : PG_RETURN_XML_P(cstring_to_xmltype(result));
2967 : }
2968 :
2969 :
2970 : Datum
2971 6 : query_to_xmlschema(PG_FUNCTION_ARGS)
2972 : {
2973 6 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
2974 6 : bool nulls = PG_GETARG_BOOL(1);
2975 6 : bool tableforest = PG_GETARG_BOOL(2);
2976 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
2977 : const char *result;
2978 : SPIPlanPtr plan;
2979 : Portal portal;
2980 :
2981 6 : SPI_connect();
2982 :
2983 6 : if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
2984 0 : elog(ERROR, "SPI_prepare(\"%s\") failed", query);
2985 :
2986 6 : if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
2987 0 : elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
2988 :
2989 6 : result = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
2990 : InvalidOid, nulls,
2991 : tableforest, targetns));
2992 6 : SPI_cursor_close(portal);
2993 6 : SPI_finish();
2994 :
2995 6 : PG_RETURN_XML_P(cstring_to_xmltype(result));
2996 : }
2997 :
2998 :
2999 : Datum
3000 12 : cursor_to_xmlschema(PG_FUNCTION_ARGS)
3001 : {
3002 12 : char *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
3003 12 : bool nulls = PG_GETARG_BOOL(1);
3004 12 : bool tableforest = PG_GETARG_BOOL(2);
3005 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3006 : const char *xmlschema;
3007 : Portal portal;
3008 :
3009 12 : SPI_connect();
3010 12 : portal = SPI_cursor_find(name);
3011 12 : if (portal == NULL)
3012 0 : ereport(ERROR,
3013 : (errcode(ERRCODE_UNDEFINED_CURSOR),
3014 : errmsg("cursor \"%s\" does not exist", name)));
3015 :
3016 12 : xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
3017 : InvalidOid, nulls,
3018 : tableforest, targetns));
3019 12 : SPI_finish();
3020 :
3021 12 : PG_RETURN_XML_P(cstring_to_xmltype(xmlschema));
3022 : }
3023 :
3024 :
3025 : Datum
3026 24 : table_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3027 : {
3028 24 : Oid relid = PG_GETARG_OID(0);
3029 24 : bool nulls = PG_GETARG_BOOL(1);
3030 24 : bool tableforest = PG_GETARG_BOOL(2);
3031 24 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3032 : Relation rel;
3033 : const char *xmlschema;
3034 :
3035 24 : rel = table_open(relid, AccessShareLock);
3036 24 : xmlschema = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
3037 : tableforest, targetns);
3038 24 : table_close(rel, NoLock);
3039 :
3040 24 : PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid,
3041 : xmlschema, nulls, tableforest,
3042 : targetns, true)));
3043 : }
3044 :
3045 :
3046 : Datum
3047 6 : query_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3048 : {
3049 6 : char *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
3050 6 : bool nulls = PG_GETARG_BOOL(1);
3051 6 : bool tableforest = PG_GETARG_BOOL(2);
3052 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3053 :
3054 : const char *xmlschema;
3055 : SPIPlanPtr plan;
3056 : Portal portal;
3057 :
3058 6 : SPI_connect();
3059 :
3060 6 : if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
3061 0 : elog(ERROR, "SPI_prepare(\"%s\") failed", query);
3062 :
3063 6 : if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
3064 0 : elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
3065 :
3066 6 : xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
3067 : InvalidOid, nulls, tableforest, targetns));
3068 6 : SPI_cursor_close(portal);
3069 6 : SPI_finish();
3070 :
3071 6 : PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
3072 : xmlschema, nulls, tableforest,
3073 : targetns, true)));
3074 : }
3075 :
3076 :
3077 : /*
3078 : * Map SQL schema to XML and/or XML Schema document; see SQL/XML:2008
3079 : * sections 9.13, 9.14.
3080 : */
3081 :
3082 : static StringInfo
3083 18 : schema_to_xml_internal(Oid nspid, const char *xmlschema, bool nulls,
3084 : bool tableforest, const char *targetns, bool top_level)
3085 : {
3086 : StringInfo result;
3087 : char *xmlsn;
3088 : List *relid_list;
3089 : ListCell *cell;
3090 :
3091 18 : xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid),
3092 : true, false);
3093 18 : result = makeStringInfo();
3094 :
3095 18 : xmldata_root_element_start(result, xmlsn, xmlschema, targetns, top_level);
3096 18 : appendStringInfoChar(result, '\n');
3097 :
3098 18 : if (xmlschema)
3099 6 : appendStringInfo(result, "%s\n\n", xmlschema);
3100 :
3101 18 : SPI_connect();
3102 :
3103 18 : relid_list = schema_get_xml_visible_tables(nspid);
3104 :
3105 54 : foreach(cell, relid_list)
3106 : {
3107 36 : Oid relid = lfirst_oid(cell);
3108 : StringInfo subres;
3109 :
3110 36 : subres = table_to_xml_internal(relid, NULL, nulls, tableforest,
3111 : targetns, false);
3112 :
3113 36 : appendBinaryStringInfo(result, subres->data, subres->len);
3114 36 : appendStringInfoChar(result, '\n');
3115 : }
3116 :
3117 18 : SPI_finish();
3118 :
3119 18 : xmldata_root_element_end(result, xmlsn);
3120 :
3121 18 : return result;
3122 : }
3123 :
3124 :
3125 : Datum
3126 12 : schema_to_xml(PG_FUNCTION_ARGS)
3127 : {
3128 12 : Name name = PG_GETARG_NAME(0);
3129 12 : bool nulls = PG_GETARG_BOOL(1);
3130 12 : bool tableforest = PG_GETARG_BOOL(2);
3131 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3132 :
3133 : char *schemaname;
3134 : Oid nspid;
3135 :
3136 12 : schemaname = NameStr(*name);
3137 12 : nspid = LookupExplicitNamespace(schemaname, false);
3138 :
3139 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid, NULL,
3140 : nulls, tableforest, targetns, true)));
3141 : }
3142 :
3143 :
3144 : /*
3145 : * Write the start element of the root element of an XML Schema mapping.
3146 : */
3147 : static void
3148 96 : xsd_schema_element_start(StringInfo result, const char *targetns)
3149 : {
3150 96 : appendStringInfoString(result,
3151 : "<xsd:schema\n"
3152 : " xmlns:xsd=\"" NAMESPACE_XSD "\"");
3153 96 : if (strlen(targetns) > 0)
3154 18 : appendStringInfo(result,
3155 : "\n"
3156 : " targetNamespace=\"%s\"\n"
3157 : " elementFormDefault=\"qualified\"",
3158 : targetns);
3159 96 : appendStringInfoString(result,
3160 : ">\n\n");
3161 96 : }
3162 :
3163 :
3164 : static void
3165 96 : xsd_schema_element_end(StringInfo result)
3166 : {
3167 96 : appendStringInfoString(result, "</xsd:schema>");
3168 96 : }
3169 :
3170 :
3171 : static StringInfo
3172 18 : schema_to_xmlschema_internal(const char *schemaname, bool nulls,
3173 : bool tableforest, const char *targetns)
3174 : {
3175 : Oid nspid;
3176 : List *relid_list;
3177 : List *tupdesc_list;
3178 : ListCell *cell;
3179 : StringInfo result;
3180 :
3181 18 : result = makeStringInfo();
3182 :
3183 18 : nspid = LookupExplicitNamespace(schemaname, false);
3184 :
3185 18 : xsd_schema_element_start(result, targetns);
3186 :
3187 18 : SPI_connect();
3188 :
3189 18 : relid_list = schema_get_xml_visible_tables(nspid);
3190 :
3191 18 : tupdesc_list = NIL;
3192 54 : foreach(cell, relid_list)
3193 : {
3194 : Relation rel;
3195 :
3196 36 : rel = table_open(lfirst_oid(cell), AccessShareLock);
3197 36 : tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
3198 36 : table_close(rel, NoLock);
3199 : }
3200 :
3201 18 : appendStringInfoString(result,
3202 : map_sql_typecoll_to_xmlschema_types(tupdesc_list));
3203 :
3204 18 : appendStringInfoString(result,
3205 : map_sql_schema_to_xmlschema_types(nspid, relid_list,
3206 : nulls, tableforest, targetns));
3207 :
3208 18 : xsd_schema_element_end(result);
3209 :
3210 18 : SPI_finish();
3211 :
3212 18 : return result;
3213 : }
3214 :
3215 :
3216 : Datum
3217 12 : schema_to_xmlschema(PG_FUNCTION_ARGS)
3218 : {
3219 12 : Name name = PG_GETARG_NAME(0);
3220 12 : bool nulls = PG_GETARG_BOOL(1);
3221 12 : bool tableforest = PG_GETARG_BOOL(2);
3222 12 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3223 :
3224 12 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xmlschema_internal(NameStr(*name),
3225 : nulls, tableforest, targetns)));
3226 : }
3227 :
3228 :
3229 : Datum
3230 6 : schema_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3231 : {
3232 6 : Name name = PG_GETARG_NAME(0);
3233 6 : bool nulls = PG_GETARG_BOOL(1);
3234 6 : bool tableforest = PG_GETARG_BOOL(2);
3235 6 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
3236 : char *schemaname;
3237 : Oid nspid;
3238 : StringInfo xmlschema;
3239 :
3240 6 : schemaname = NameStr(*name);
3241 6 : nspid = LookupExplicitNamespace(schemaname, false);
3242 :
3243 6 : xmlschema = schema_to_xmlschema_internal(schemaname, nulls,
3244 : tableforest, targetns);
3245 :
3246 6 : PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid,
3247 : xmlschema->data, nulls,
3248 : tableforest, targetns, true)));
3249 : }
3250 :
3251 :
3252 : /*
3253 : * Map SQL database to XML and/or XML Schema document; see SQL/XML:2008
3254 : * sections 9.16, 9.17.
3255 : */
3256 :
3257 : static StringInfo
3258 0 : database_to_xml_internal(const char *xmlschema, bool nulls,
3259 : bool tableforest, const char *targetns)
3260 : {
3261 : StringInfo result;
3262 : List *nspid_list;
3263 : ListCell *cell;
3264 : char *xmlcn;
3265 :
3266 0 : xmlcn = map_sql_identifier_to_xml_name(get_database_name(MyDatabaseId),
3267 : true, false);
3268 0 : result = makeStringInfo();
3269 :
3270 0 : xmldata_root_element_start(result, xmlcn, xmlschema, targetns, true);
3271 0 : appendStringInfoChar(result, '\n');
3272 :
3273 0 : if (xmlschema)
3274 0 : appendStringInfo(result, "%s\n\n", xmlschema);
3275 :
3276 0 : SPI_connect();
3277 :
3278 0 : nspid_list = database_get_xml_visible_schemas();
3279 :
3280 0 : foreach(cell, nspid_list)
3281 : {
3282 0 : Oid nspid = lfirst_oid(cell);
3283 : StringInfo subres;
3284 :
3285 0 : subres = schema_to_xml_internal(nspid, NULL, nulls,
3286 : tableforest, targetns, false);
3287 :
3288 0 : appendBinaryStringInfo(result, subres->data, subres->len);
3289 0 : appendStringInfoChar(result, '\n');
3290 : }
3291 :
3292 0 : SPI_finish();
3293 :
3294 0 : xmldata_root_element_end(result, xmlcn);
3295 :
3296 0 : return result;
3297 : }
3298 :
3299 :
3300 : Datum
3301 0 : database_to_xml(PG_FUNCTION_ARGS)
3302 : {
3303 0 : bool nulls = PG_GETARG_BOOL(0);
3304 0 : bool tableforest = PG_GETARG_BOOL(1);
3305 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3306 :
3307 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(NULL, nulls,
3308 : tableforest, targetns)));
3309 : }
3310 :
3311 :
3312 : static StringInfo
3313 0 : database_to_xmlschema_internal(bool nulls, bool tableforest,
3314 : const char *targetns)
3315 : {
3316 : List *relid_list;
3317 : List *nspid_list;
3318 : List *tupdesc_list;
3319 : ListCell *cell;
3320 : StringInfo result;
3321 :
3322 0 : result = makeStringInfo();
3323 :
3324 0 : xsd_schema_element_start(result, targetns);
3325 :
3326 0 : SPI_connect();
3327 :
3328 0 : relid_list = database_get_xml_visible_tables();
3329 0 : nspid_list = database_get_xml_visible_schemas();
3330 :
3331 0 : tupdesc_list = NIL;
3332 0 : foreach(cell, relid_list)
3333 : {
3334 : Relation rel;
3335 :
3336 0 : rel = table_open(lfirst_oid(cell), AccessShareLock);
3337 0 : tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
3338 0 : table_close(rel, NoLock);
3339 : }
3340 :
3341 0 : appendStringInfoString(result,
3342 : map_sql_typecoll_to_xmlschema_types(tupdesc_list));
3343 :
3344 0 : appendStringInfoString(result,
3345 : map_sql_catalog_to_xmlschema_types(nspid_list, nulls, tableforest, targetns));
3346 :
3347 0 : xsd_schema_element_end(result);
3348 :
3349 0 : SPI_finish();
3350 :
3351 0 : return result;
3352 : }
3353 :
3354 :
3355 : Datum
3356 0 : database_to_xmlschema(PG_FUNCTION_ARGS)
3357 : {
3358 0 : bool nulls = PG_GETARG_BOOL(0);
3359 0 : bool tableforest = PG_GETARG_BOOL(1);
3360 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3361 :
3362 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xmlschema_internal(nulls,
3363 : tableforest, targetns)));
3364 : }
3365 :
3366 :
3367 : Datum
3368 0 : database_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
3369 : {
3370 0 : bool nulls = PG_GETARG_BOOL(0);
3371 0 : bool tableforest = PG_GETARG_BOOL(1);
3372 0 : const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
3373 : StringInfo xmlschema;
3374 :
3375 0 : xmlschema = database_to_xmlschema_internal(nulls, tableforest, targetns);
3376 :
3377 0 : PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(xmlschema->data,
3378 : nulls, tableforest, targetns)));
3379 : }
3380 :
3381 :
3382 : /*
3383 : * Map a multi-part SQL name to an XML name; see SQL/XML:2008 section
3384 : * 9.2.
3385 : */
3386 : static char *
3387 384 : map_multipart_sql_identifier_to_xml_name(const char *a, const char *b, const char *c, const char *d)
3388 : {
3389 : StringInfoData result;
3390 :
3391 384 : initStringInfo(&result);
3392 :
3393 384 : if (a)
3394 384 : appendStringInfoString(&result,
3395 384 : map_sql_identifier_to_xml_name(a, true, true));
3396 384 : if (b)
3397 384 : appendStringInfo(&result, ".%s",
3398 : map_sql_identifier_to_xml_name(b, true, true));
3399 384 : if (c)
3400 384 : appendStringInfo(&result, ".%s",
3401 : map_sql_identifier_to_xml_name(c, true, true));
3402 384 : if (d)
3403 366 : appendStringInfo(&result, ".%s",
3404 : map_sql_identifier_to_xml_name(d, true, true));
3405 :
3406 384 : return result.data;
3407 : }
3408 :
3409 :
3410 : /*
3411 : * Map an SQL table to an XML Schema document; see SQL/XML:2008
3412 : * section 9.11.
3413 : *
3414 : * Map an SQL table to XML Schema data types; see SQL/XML:2008 section
3415 : * 9.9.
3416 : */
3417 : static const char *
3418 78 : map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid, bool nulls,
3419 : bool tableforest, const char *targetns)
3420 : {
3421 : int i;
3422 : char *xmltn;
3423 : char *tabletypename;
3424 : char *rowtypename;
3425 : StringInfoData result;
3426 :
3427 78 : initStringInfo(&result);
3428 :
3429 78 : if (OidIsValid(relid))
3430 : {
3431 : HeapTuple tuple;
3432 : Form_pg_class reltuple;
3433 :
3434 54 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
3435 54 : if (!HeapTupleIsValid(tuple))
3436 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
3437 54 : reltuple = (Form_pg_class) GETSTRUCT(tuple);
3438 :
3439 54 : xmltn = map_sql_identifier_to_xml_name(NameStr(reltuple->relname),
3440 : true, false);
3441 :
3442 54 : tabletypename = map_multipart_sql_identifier_to_xml_name("TableType",
3443 54 : get_database_name(MyDatabaseId),
3444 54 : get_namespace_name(reltuple->relnamespace),
3445 54 : NameStr(reltuple->relname));
3446 :
3447 54 : rowtypename = map_multipart_sql_identifier_to_xml_name("RowType",
3448 54 : get_database_name(MyDatabaseId),
3449 54 : get_namespace_name(reltuple->relnamespace),
3450 54 : NameStr(reltuple->relname));
3451 :
3452 54 : ReleaseSysCache(tuple);
3453 : }
3454 : else
3455 : {
3456 24 : if (tableforest)
3457 12 : xmltn = "row";
3458 : else
3459 12 : xmltn = "table";
3460 :
3461 24 : tabletypename = "TableType";
3462 24 : rowtypename = "RowType";
3463 : }
3464 :
3465 78 : xsd_schema_element_start(&result, targetns);
3466 :
3467 78 : appendStringInfoString(&result,
3468 78 : map_sql_typecoll_to_xmlschema_types(list_make1(tupdesc)));
3469 :
3470 78 : appendStringInfo(&result,
3471 : "<xsd:complexType name=\"%s\">\n"
3472 : " <xsd:sequence>\n",
3473 : rowtypename);
3474 :
3475 324 : for (i = 0; i < tupdesc->natts; i++)
3476 : {
3477 246 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3478 :
3479 246 : if (att->attisdropped)
3480 6 : continue;
3481 480 : appendStringInfo(&result,
3482 : " <xsd:element name=\"%s\" type=\"%s\"%s></xsd:element>\n",
3483 240 : map_sql_identifier_to_xml_name(NameStr(att->attname),
3484 : true, false),
3485 : map_sql_type_to_xml_name(att->atttypid, -1),
3486 : nulls ? " nillable=\"true\"" : " minOccurs=\"0\"");
3487 : }
3488 :
3489 78 : appendStringInfoString(&result,
3490 : " </xsd:sequence>\n"
3491 : "</xsd:complexType>\n\n");
3492 :
3493 78 : if (!tableforest)
3494 : {
3495 42 : appendStringInfo(&result,
3496 : "<xsd:complexType name=\"%s\">\n"
3497 : " <xsd:sequence>\n"
3498 : " <xsd:element name=\"row\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n"
3499 : " </xsd:sequence>\n"
3500 : "</xsd:complexType>\n\n",
3501 : tabletypename, rowtypename);
3502 :
3503 42 : appendStringInfo(&result,
3504 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3505 : xmltn, tabletypename);
3506 : }
3507 : else
3508 36 : appendStringInfo(&result,
3509 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3510 : xmltn, rowtypename);
3511 :
3512 78 : xsd_schema_element_end(&result);
3513 :
3514 78 : return result.data;
3515 : }
3516 :
3517 :
3518 : /*
3519 : * Map an SQL schema to XML Schema data types; see SQL/XML:2008
3520 : * section 9.12.
3521 : */
3522 : static const char *
3523 18 : map_sql_schema_to_xmlschema_types(Oid nspid, List *relid_list, bool nulls,
3524 : bool tableforest, const char *targetns)
3525 : {
3526 : char *dbname;
3527 : char *nspname;
3528 : char *xmlsn;
3529 : char *schematypename;
3530 : StringInfoData result;
3531 : ListCell *cell;
3532 :
3533 18 : dbname = get_database_name(MyDatabaseId);
3534 18 : nspname = get_namespace_name(nspid);
3535 :
3536 18 : initStringInfo(&result);
3537 :
3538 18 : xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
3539 :
3540 18 : schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
3541 : dbname,
3542 : nspname,
3543 : NULL);
3544 :
3545 18 : appendStringInfo(&result,
3546 : "<xsd:complexType name=\"%s\">\n", schematypename);
3547 18 : if (!tableforest)
3548 6 : appendStringInfoString(&result,
3549 : " <xsd:all>\n");
3550 : else
3551 12 : appendStringInfoString(&result,
3552 : " <xsd:sequence>\n");
3553 :
3554 54 : foreach(cell, relid_list)
3555 : {
3556 36 : Oid relid = lfirst_oid(cell);
3557 36 : char *relname = get_rel_name(relid);
3558 36 : char *xmltn = map_sql_identifier_to_xml_name(relname, true, false);
3559 36 : char *tabletypename = map_multipart_sql_identifier_to_xml_name(tableforest ? "RowType" : "TableType",
3560 : dbname,
3561 : nspname,
3562 : relname);
3563 :
3564 36 : if (!tableforest)
3565 12 : appendStringInfo(&result,
3566 : " <xsd:element name=\"%s\" type=\"%s\"/>\n",
3567 : xmltn, tabletypename);
3568 : else
3569 24 : appendStringInfo(&result,
3570 : " <xsd:element name=\"%s\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n",
3571 : xmltn, tabletypename);
3572 : }
3573 :
3574 18 : if (!tableforest)
3575 6 : appendStringInfoString(&result,
3576 : " </xsd:all>\n");
3577 : else
3578 12 : appendStringInfoString(&result,
3579 : " </xsd:sequence>\n");
3580 18 : appendStringInfoString(&result,
3581 : "</xsd:complexType>\n\n");
3582 :
3583 18 : appendStringInfo(&result,
3584 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3585 : xmlsn, schematypename);
3586 :
3587 18 : return result.data;
3588 : }
3589 :
3590 :
3591 : /*
3592 : * Map an SQL catalog to XML Schema data types; see SQL/XML:2008
3593 : * section 9.15.
3594 : */
3595 : static const char *
3596 0 : map_sql_catalog_to_xmlschema_types(List *nspid_list, bool nulls,
3597 : bool tableforest, const char *targetns)
3598 : {
3599 : char *dbname;
3600 : char *xmlcn;
3601 : char *catalogtypename;
3602 : StringInfoData result;
3603 : ListCell *cell;
3604 :
3605 0 : dbname = get_database_name(MyDatabaseId);
3606 :
3607 0 : initStringInfo(&result);
3608 :
3609 0 : xmlcn = map_sql_identifier_to_xml_name(dbname, true, false);
3610 :
3611 0 : catalogtypename = map_multipart_sql_identifier_to_xml_name("CatalogType",
3612 : dbname,
3613 : NULL,
3614 : NULL);
3615 :
3616 0 : appendStringInfo(&result,
3617 : "<xsd:complexType name=\"%s\">\n", catalogtypename);
3618 0 : appendStringInfoString(&result,
3619 : " <xsd:all>\n");
3620 :
3621 0 : foreach(cell, nspid_list)
3622 : {
3623 0 : Oid nspid = lfirst_oid(cell);
3624 0 : char *nspname = get_namespace_name(nspid);
3625 0 : char *xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
3626 0 : char *schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
3627 : dbname,
3628 : nspname,
3629 : NULL);
3630 :
3631 0 : appendStringInfo(&result,
3632 : " <xsd:element name=\"%s\" type=\"%s\"/>\n",
3633 : xmlsn, schematypename);
3634 : }
3635 :
3636 0 : appendStringInfoString(&result,
3637 : " </xsd:all>\n");
3638 0 : appendStringInfoString(&result,
3639 : "</xsd:complexType>\n\n");
3640 :
3641 0 : appendStringInfo(&result,
3642 : "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
3643 : xmlcn, catalogtypename);
3644 :
3645 0 : return result.data;
3646 : }
3647 :
3648 :
3649 : /*
3650 : * Map an SQL data type to an XML name; see SQL/XML:2008 section 9.4.
3651 : */
3652 : static const char *
3653 810 : map_sql_type_to_xml_name(Oid typeoid, int typmod)
3654 : {
3655 : StringInfoData result;
3656 :
3657 810 : initStringInfo(&result);
3658 :
3659 810 : switch (typeoid)
3660 : {
3661 30 : case BPCHAROID:
3662 30 : if (typmod == -1)
3663 30 : appendStringInfoString(&result, "CHAR");
3664 : else
3665 0 : appendStringInfo(&result, "CHAR_%d", typmod - VARHDRSZ);
3666 30 : break;
3667 54 : case VARCHAROID:
3668 54 : if (typmod == -1)
3669 54 : appendStringInfoString(&result, "VARCHAR");
3670 : else
3671 0 : appendStringInfo(&result, "VARCHAR_%d", typmod - VARHDRSZ);
3672 54 : break;
3673 30 : case NUMERICOID:
3674 30 : if (typmod == -1)
3675 30 : appendStringInfoString(&result, "NUMERIC");
3676 : else
3677 0 : appendStringInfo(&result, "NUMERIC_%d_%d",
3678 0 : ((typmod - VARHDRSZ) >> 16) & 0xffff,
3679 0 : (typmod - VARHDRSZ) & 0xffff);
3680 30 : break;
3681 174 : case INT4OID:
3682 174 : appendStringInfoString(&result, "INTEGER");
3683 174 : break;
3684 30 : case INT2OID:
3685 30 : appendStringInfoString(&result, "SMALLINT");
3686 30 : break;
3687 30 : case INT8OID:
3688 30 : appendStringInfoString(&result, "BIGINT");
3689 30 : break;
3690 30 : case FLOAT4OID:
3691 30 : appendStringInfoString(&result, "REAL");
3692 30 : break;
3693 0 : case FLOAT8OID:
3694 0 : appendStringInfoString(&result, "DOUBLE");
3695 0 : break;
3696 30 : case BOOLOID:
3697 30 : appendStringInfoString(&result, "BOOLEAN");
3698 30 : break;
3699 30 : case TIMEOID:
3700 30 : if (typmod == -1)
3701 30 : appendStringInfoString(&result, "TIME");
3702 : else
3703 0 : appendStringInfo(&result, "TIME_%d", typmod);
3704 30 : break;
3705 30 : case TIMETZOID:
3706 30 : if (typmod == -1)
3707 30 : appendStringInfoString(&result, "TIME_WTZ");
3708 : else
3709 0 : appendStringInfo(&result, "TIME_WTZ_%d", typmod);
3710 30 : break;
3711 30 : case TIMESTAMPOID:
3712 30 : if (typmod == -1)
3713 30 : appendStringInfoString(&result, "TIMESTAMP");
3714 : else
3715 0 : appendStringInfo(&result, "TIMESTAMP_%d", typmod);
3716 30 : break;
3717 30 : case TIMESTAMPTZOID:
3718 30 : if (typmod == -1)
3719 30 : appendStringInfoString(&result, "TIMESTAMP_WTZ");
3720 : else
3721 0 : appendStringInfo(&result, "TIMESTAMP_WTZ_%d", typmod);
3722 30 : break;
3723 30 : case DATEOID:
3724 30 : appendStringInfoString(&result, "DATE");
3725 30 : break;
3726 30 : case XMLOID:
3727 30 : appendStringInfoString(&result, "XML");
3728 30 : break;
3729 222 : default:
3730 : {
3731 : HeapTuple tuple;
3732 : Form_pg_type typtuple;
3733 :
3734 222 : tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeoid));
3735 222 : if (!HeapTupleIsValid(tuple))
3736 0 : elog(ERROR, "cache lookup failed for type %u", typeoid);
3737 222 : typtuple = (Form_pg_type) GETSTRUCT(tuple);
3738 :
3739 222 : appendStringInfoString(&result,
3740 222 : map_multipart_sql_identifier_to_xml_name((typtuple->typtype == TYPTYPE_DOMAIN) ? "Domain" : "UDT",
3741 222 : get_database_name(MyDatabaseId),
3742 222 : get_namespace_name(typtuple->typnamespace),
3743 222 : NameStr(typtuple->typname)));
3744 :
3745 222 : ReleaseSysCache(tuple);
3746 : }
3747 : }
3748 :
3749 810 : return result.data;
3750 : }
3751 :
3752 :
3753 : /*
3754 : * Map a collection of SQL data types to XML Schema data types; see
3755 : * SQL/XML:2008 section 9.7.
3756 : */
3757 : static const char *
3758 96 : map_sql_typecoll_to_xmlschema_types(List *tupdesc_list)
3759 : {
3760 96 : List *uniquetypes = NIL;
3761 : int i;
3762 : StringInfoData result;
3763 : ListCell *cell0;
3764 :
3765 : /* extract all column types used in the set of TupleDescs */
3766 210 : foreach(cell0, tupdesc_list)
3767 : {
3768 114 : TupleDesc tupdesc = (TupleDesc) lfirst(cell0);
3769 :
3770 702 : for (i = 0; i < tupdesc->natts; i++)
3771 : {
3772 588 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3773 :
3774 588 : if (att->attisdropped)
3775 24 : continue;
3776 564 : uniquetypes = list_append_unique_oid(uniquetypes, att->atttypid);
3777 : }
3778 : }
3779 :
3780 : /* add base types of domains */
3781 642 : foreach(cell0, uniquetypes)
3782 : {
3783 546 : Oid typid = lfirst_oid(cell0);
3784 546 : Oid basetypid = getBaseType(typid);
3785 :
3786 546 : if (basetypid != typid)
3787 24 : uniquetypes = list_append_unique_oid(uniquetypes, basetypid);
3788 : }
3789 :
3790 : /* Convert to textual form */
3791 96 : initStringInfo(&result);
3792 :
3793 642 : foreach(cell0, uniquetypes)
3794 : {
3795 546 : appendStringInfo(&result, "%s\n",
3796 : map_sql_type_to_xmlschema_type(lfirst_oid(cell0),
3797 : -1));
3798 : }
3799 :
3800 96 : return result.data;
3801 : }
3802 :
3803 :
3804 : /*
3805 : * Map an SQL data type to a named XML Schema data type; see
3806 : * SQL/XML:2008 sections 9.5 and 9.6.
3807 : *
3808 : * (The distinction between 9.5 and 9.6 is basically that 9.6 adds
3809 : * a name attribute, which this function does. The name-less version
3810 : * 9.5 doesn't appear to be required anywhere.)
3811 : */
3812 : static const char *
3813 546 : map_sql_type_to_xmlschema_type(Oid typeoid, int typmod)
3814 : {
3815 : StringInfoData result;
3816 546 : const char *typename = map_sql_type_to_xml_name(typeoid, typmod);
3817 :
3818 546 : initStringInfo(&result);
3819 :
3820 546 : if (typeoid == XMLOID)
3821 : {
3822 24 : appendStringInfoString(&result,
3823 : "<xsd:complexType mixed=\"true\">\n"
3824 : " <xsd:sequence>\n"
3825 : " <xsd:any name=\"element\" minOccurs=\"0\" maxOccurs=\"unbounded\" processContents=\"skip\"/>\n"
3826 : " </xsd:sequence>\n"
3827 : "</xsd:complexType>\n");
3828 : }
3829 : else
3830 : {
3831 522 : appendStringInfo(&result,
3832 : "<xsd:simpleType name=\"%s\">\n", typename);
3833 :
3834 522 : switch (typeoid)
3835 : {
3836 138 : case BPCHAROID:
3837 : case VARCHAROID:
3838 : case TEXTOID:
3839 138 : appendStringInfoString(&result,
3840 : " <xsd:restriction base=\"xsd:string\">\n");
3841 138 : if (typmod != -1)
3842 0 : appendStringInfo(&result,
3843 : " <xsd:maxLength value=\"%d\"/>\n",
3844 : typmod - VARHDRSZ);
3845 138 : appendStringInfoString(&result, " </xsd:restriction>\n");
3846 138 : break;
3847 :
3848 24 : case BYTEAOID:
3849 24 : appendStringInfo(&result,
3850 : " <xsd:restriction base=\"xsd:%s\">\n"
3851 : " </xsd:restriction>\n",
3852 24 : xmlbinary == XMLBINARY_BASE64 ? "base64Binary" : "hexBinary");
3853 24 : break;
3854 :
3855 24 : case NUMERICOID:
3856 24 : if (typmod != -1)
3857 0 : appendStringInfo(&result,
3858 : " <xsd:restriction base=\"xsd:decimal\">\n"
3859 : " <xsd:totalDigits value=\"%d\"/>\n"
3860 : " <xsd:fractionDigits value=\"%d\"/>\n"
3861 : " </xsd:restriction>\n",
3862 0 : ((typmod - VARHDRSZ) >> 16) & 0xffff,
3863 0 : (typmod - VARHDRSZ) & 0xffff);
3864 24 : break;
3865 :
3866 24 : case INT2OID:
3867 24 : appendStringInfo(&result,
3868 : " <xsd:restriction base=\"xsd:short\">\n"
3869 : " <xsd:maxInclusive value=\"%d\"/>\n"
3870 : " <xsd:minInclusive value=\"%d\"/>\n"
3871 : " </xsd:restriction>\n",
3872 : SHRT_MAX, SHRT_MIN);
3873 24 : break;
3874 :
3875 96 : case INT4OID:
3876 96 : appendStringInfo(&result,
3877 : " <xsd:restriction base=\"xsd:int\">\n"
3878 : " <xsd:maxInclusive value=\"%d\"/>\n"
3879 : " <xsd:minInclusive value=\"%d\"/>\n"
3880 : " </xsd:restriction>\n",
3881 : INT_MAX, INT_MIN);
3882 96 : break;
3883 :
3884 24 : case INT8OID:
3885 24 : appendStringInfo(&result,
3886 : " <xsd:restriction base=\"xsd:long\">\n"
3887 : " <xsd:maxInclusive value=\"" INT64_FORMAT "\"/>\n"
3888 : " <xsd:minInclusive value=\"" INT64_FORMAT "\"/>\n"
3889 : " </xsd:restriction>\n",
3890 : PG_INT64_MAX,
3891 : PG_INT64_MIN);
3892 24 : break;
3893 :
3894 24 : case FLOAT4OID:
3895 24 : appendStringInfoString(&result,
3896 : " <xsd:restriction base=\"xsd:float\"></xsd:restriction>\n");
3897 24 : break;
3898 :
3899 0 : case FLOAT8OID:
3900 0 : appendStringInfoString(&result,
3901 : " <xsd:restriction base=\"xsd:double\"></xsd:restriction>\n");
3902 0 : break;
3903 :
3904 24 : case BOOLOID:
3905 24 : appendStringInfoString(&result,
3906 : " <xsd:restriction base=\"xsd:boolean\"></xsd:restriction>\n");
3907 24 : break;
3908 :
3909 48 : case TIMEOID:
3910 : case TIMETZOID:
3911 : {
3912 48 : const char *tz = (typeoid == TIMETZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
3913 :
3914 48 : if (typmod == -1)
3915 48 : appendStringInfo(&result,
3916 : " <xsd:restriction base=\"xsd:time\">\n"
3917 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
3918 : " </xsd:restriction>\n", tz);
3919 0 : else if (typmod == 0)
3920 0 : appendStringInfo(&result,
3921 : " <xsd:restriction base=\"xsd:time\">\n"
3922 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
3923 : " </xsd:restriction>\n", tz);
3924 : else
3925 0 : appendStringInfo(&result,
3926 : " <xsd:restriction base=\"xsd:time\">\n"
3927 : " <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
3928 : " </xsd:restriction>\n", typmod - VARHDRSZ, tz);
3929 48 : break;
3930 : }
3931 :
3932 48 : case TIMESTAMPOID:
3933 : case TIMESTAMPTZOID:
3934 : {
3935 48 : const char *tz = (typeoid == TIMESTAMPTZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
3936 :
3937 48 : if (typmod == -1)
3938 48 : appendStringInfo(&result,
3939 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3940 : " <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"
3941 : " </xsd:restriction>\n", tz);
3942 0 : else if (typmod == 0)
3943 0 : appendStringInfo(&result,
3944 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3945 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
3946 : " </xsd:restriction>\n", tz);
3947 : else
3948 0 : appendStringInfo(&result,
3949 : " <xsd:restriction base=\"xsd:dateTime\">\n"
3950 : " <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"
3951 : " </xsd:restriction>\n", typmod - VARHDRSZ, tz);
3952 48 : break;
3953 : }
3954 :
3955 24 : case DATEOID:
3956 24 : appendStringInfoString(&result,
3957 : " <xsd:restriction base=\"xsd:date\">\n"
3958 : " <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}\"/>\n"
3959 : " </xsd:restriction>\n");
3960 24 : break;
3961 :
3962 24 : default:
3963 24 : if (get_typtype(typeoid) == TYPTYPE_DOMAIN)
3964 : {
3965 : Oid base_typeoid;
3966 24 : int32 base_typmod = -1;
3967 :
3968 24 : base_typeoid = getBaseTypeAndTypmod(typeoid, &base_typmod);
3969 :
3970 24 : appendStringInfo(&result,
3971 : " <xsd:restriction base=\"%s\"/>\n",
3972 : map_sql_type_to_xml_name(base_typeoid, base_typmod));
3973 : }
3974 24 : break;
3975 : }
3976 522 : appendStringInfoString(&result, "</xsd:simpleType>\n");
3977 : }
3978 :
3979 546 : return result.data;
3980 : }
3981 :
3982 :
3983 : /*
3984 : * Map an SQL row to an XML element, taking the row from the active
3985 : * SPI cursor. See also SQL/XML:2008 section 9.10.
3986 : */
3987 : static void
3988 312 : SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result, char *tablename,
3989 : bool nulls, bool tableforest,
3990 : const char *targetns, bool top_level)
3991 : {
3992 : int i;
3993 : char *xmltn;
3994 :
3995 312 : if (tablename)
3996 228 : xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
3997 : else
3998 : {
3999 84 : if (tableforest)
4000 36 : xmltn = "row";
4001 : else
4002 48 : xmltn = "table";
4003 : }
4004 :
4005 312 : if (tableforest)
4006 162 : xmldata_root_element_start(result, xmltn, NULL, targetns, top_level);
4007 : else
4008 150 : appendStringInfoString(result, "<row>\n");
4009 :
4010 1272 : for (i = 1; i <= SPI_tuptable->tupdesc->natts; i++)
4011 : {
4012 : char *colname;
4013 : Datum colval;
4014 : bool isnull;
4015 :
4016 960 : colname = map_sql_identifier_to_xml_name(SPI_fname(SPI_tuptable->tupdesc, i),
4017 : true, false);
4018 960 : colval = SPI_getbinval(SPI_tuptable->vals[rownum],
4019 960 : SPI_tuptable->tupdesc,
4020 : i,
4021 : &isnull);
4022 960 : if (isnull)
4023 : {
4024 114 : if (nulls)
4025 60 : appendStringInfo(result, " <%s xsi:nil=\"true\"/>\n", colname);
4026 : }
4027 : else
4028 846 : appendStringInfo(result, " <%s>%s</%s>\n",
4029 : colname,
4030 : map_sql_value_to_xml_value(colval,
4031 846 : SPI_gettypeid(SPI_tuptable->tupdesc, i), true),
4032 : colname);
4033 : }
4034 :
4035 312 : if (tableforest)
4036 : {
4037 162 : xmldata_root_element_end(result, xmltn);
4038 162 : appendStringInfoChar(result, '\n');
4039 : }
4040 : else
4041 150 : appendStringInfoString(result, "</row>\n\n");
4042 312 : }
4043 :
4044 :
4045 : /*
4046 : * XPath related functions
4047 : */
4048 :
4049 : #ifdef USE_LIBXML
4050 :
4051 : /*
4052 : * Convert XML node to text.
4053 : *
4054 : * For attribute and text nodes, return the escaped text. For anything else,
4055 : * dump the whole subtree.
4056 : */
4057 : static text *
4058 192 : xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt)
4059 : {
4060 192 : xmltype *result = NULL;
4061 :
4062 192 : if (cur->type != XML_ATTRIBUTE_NODE && cur->type != XML_TEXT_NODE)
4063 162 : {
4064 162 : void (*volatile nodefree) (xmlNodePtr) = NULL;
4065 162 : volatile xmlBufferPtr buf = NULL;
4066 162 : volatile xmlNodePtr cur_copy = NULL;
4067 :
4068 162 : PG_TRY();
4069 : {
4070 : int bytes;
4071 :
4072 162 : buf = xmlBufferCreate();
4073 162 : if (buf == NULL || xmlerrcxt->err_occurred)
4074 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4075 : "could not allocate xmlBuffer");
4076 :
4077 : /*
4078 : * Produce a dump of the node that we can serialize. xmlNodeDump
4079 : * does that, but the result of that function won't contain
4080 : * namespace definitions from ancestor nodes, so we first do a
4081 : * xmlCopyNode() which duplicates the node along with its required
4082 : * namespace definitions.
4083 : *
4084 : * Some old libxml2 versions such as 2.7.6 produce partially
4085 : * broken XML_DOCUMENT_NODE nodes (unset content field) when
4086 : * copying them. xmlNodeDump of such a node works fine, but
4087 : * xmlFreeNode crashes; set us up to call xmlFreeDoc instead.
4088 : */
4089 162 : cur_copy = xmlCopyNode(cur, 1);
4090 162 : if (cur_copy == NULL || xmlerrcxt->err_occurred)
4091 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4092 : "could not copy node");
4093 324 : nodefree = (cur_copy->type == XML_DOCUMENT_NODE) ?
4094 162 : (void (*) (xmlNodePtr)) xmlFreeDoc : xmlFreeNode;
4095 :
4096 162 : bytes = xmlNodeDump(buf, NULL, cur_copy, 0, 0);
4097 162 : if (bytes == -1 || xmlerrcxt->err_occurred)
4098 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4099 : "could not dump node");
4100 :
4101 162 : result = xmlBuffer_to_xmltype(buf);
4102 : }
4103 0 : PG_FINALLY();
4104 : {
4105 162 : if (nodefree)
4106 162 : nodefree(cur_copy);
4107 162 : if (buf)
4108 162 : xmlBufferFree(buf);
4109 : }
4110 162 : PG_END_TRY();
4111 : }
4112 : else
4113 : {
4114 : xmlChar *str;
4115 :
4116 30 : str = xmlXPathCastNodeToString(cur);
4117 30 : PG_TRY();
4118 : {
4119 : /* Here we rely on XML having the same representation as TEXT */
4120 30 : char *escaped = escape_xml((char *) str);
4121 :
4122 30 : result = (xmltype *) cstring_to_text(escaped);
4123 30 : pfree(escaped);
4124 : }
4125 0 : PG_FINALLY();
4126 : {
4127 30 : xmlFree(str);
4128 : }
4129 30 : PG_END_TRY();
4130 : }
4131 :
4132 192 : return result;
4133 : }
4134 :
4135 : /*
4136 : * Convert an XML XPath object (the result of evaluating an XPath expression)
4137 : * to an array of xml values, which are appended to astate. The function
4138 : * result value is the number of elements in the array.
4139 : *
4140 : * If "astate" is NULL then we don't generate the array value, but we still
4141 : * return the number of elements it would have had.
4142 : *
4143 : * Nodesets are converted to an array containing the nodes' textual
4144 : * representations. Primitive values (float, double, string) are converted
4145 : * to a single-element array containing the value's string representation.
4146 : */
4147 : static int
4148 540 : xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
4149 : ArrayBuildState *astate,
4150 : PgXmlErrorContext *xmlerrcxt)
4151 : {
4152 540 : int result = 0;
4153 : Datum datum;
4154 : Oid datumtype;
4155 : char *result_str;
4156 :
4157 540 : switch (xpathobj->type)
4158 : {
4159 498 : case XPATH_NODESET:
4160 498 : if (xpathobj->nodesetval != NULL)
4161 : {
4162 354 : result = xpathobj->nodesetval->nodeNr;
4163 354 : if (astate != NULL)
4164 : {
4165 : int i;
4166 :
4167 168 : for (i = 0; i < result; i++)
4168 : {
4169 90 : datum = PointerGetDatum(xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
4170 : xmlerrcxt));
4171 90 : (void) accumArrayResult(astate, datum, false,
4172 : XMLOID, CurrentMemoryContext);
4173 : }
4174 : }
4175 : }
4176 498 : return result;
4177 :
4178 12 : case XPATH_BOOLEAN:
4179 12 : if (astate == NULL)
4180 0 : return 1;
4181 12 : datum = BoolGetDatum(xpathobj->boolval);
4182 12 : datumtype = BOOLOID;
4183 12 : break;
4184 :
4185 18 : case XPATH_NUMBER:
4186 18 : if (astate == NULL)
4187 12 : return 1;
4188 6 : datum = Float8GetDatum(xpathobj->floatval);
4189 6 : datumtype = FLOAT8OID;
4190 6 : break;
4191 :
4192 12 : case XPATH_STRING:
4193 12 : if (astate == NULL)
4194 0 : return 1;
4195 12 : datum = CStringGetDatum((char *) xpathobj->stringval);
4196 12 : datumtype = CSTRINGOID;
4197 12 : break;
4198 :
4199 0 : default:
4200 0 : elog(ERROR, "xpath expression result type %d is unsupported",
4201 : xpathobj->type);
4202 : return 0; /* keep compiler quiet */
4203 : }
4204 :
4205 : /* Common code for scalar-value cases */
4206 30 : result_str = map_sql_value_to_xml_value(datum, datumtype, true);
4207 30 : datum = PointerGetDatum(cstring_to_xmltype(result_str));
4208 30 : (void) accumArrayResult(astate, datum, false,
4209 : XMLOID, CurrentMemoryContext);
4210 30 : return 1;
4211 : }
4212 :
4213 :
4214 : /*
4215 : * Common code for xpath() and xmlexists()
4216 : *
4217 : * Evaluate XPath expression and return number of nodes in res_nitems
4218 : * and array of XML values in astate. Either of those pointers can be
4219 : * NULL if the corresponding result isn't wanted.
4220 : *
4221 : * It is up to the user to ensure that the XML passed is in fact
4222 : * an XML document - XPath doesn't work easily on fragments without
4223 : * a context node being known.
4224 : */
4225 : static void
4226 558 : xpath_internal(text *xpath_expr_text, xmltype *data, ArrayType *namespaces,
4227 : int *res_nitems, ArrayBuildState *astate)
4228 : {
4229 : PgXmlErrorContext *xmlerrcxt;
4230 558 : volatile xmlParserCtxtPtr ctxt = NULL;
4231 558 : volatile xmlDocPtr doc = NULL;
4232 558 : volatile xmlXPathContextPtr xpathctx = NULL;
4233 558 : volatile xmlXPathCompExprPtr xpathcomp = NULL;
4234 558 : volatile xmlXPathObjectPtr xpathobj = NULL;
4235 : char *datastr;
4236 : int32 len;
4237 : int32 xpath_len;
4238 : xmlChar *string;
4239 : xmlChar *xpath_expr;
4240 558 : size_t xmldecl_len = 0;
4241 : int i;
4242 : int ndim;
4243 : Datum *ns_names_uris;
4244 : bool *ns_names_uris_nulls;
4245 : int ns_count;
4246 :
4247 : /*
4248 : * Namespace mappings are passed as text[]. If an empty array is passed
4249 : * (ndim = 0, "0-dimensional"), then there are no namespace mappings.
4250 : * Else, a 2-dimensional array with length of the second axis being equal
4251 : * to 2 should be passed, i.e., every subarray contains 2 elements, the
4252 : * first element defining the name, the second one the URI. Example:
4253 : * ARRAY[ARRAY['myns', 'http://example.com'], ARRAY['myns2',
4254 : * 'http://example2.com']].
4255 : */
4256 558 : ndim = namespaces ? ARR_NDIM(namespaces) : 0;
4257 558 : if (ndim != 0)
4258 : {
4259 : int *dims;
4260 :
4261 126 : dims = ARR_DIMS(namespaces);
4262 :
4263 126 : if (ndim != 2 || dims[1] != 2)
4264 0 : ereport(ERROR,
4265 : (errcode(ERRCODE_DATA_EXCEPTION),
4266 : errmsg("invalid array for XML namespace mapping"),
4267 : errdetail("The array must be two-dimensional with length of the second axis equal to 2.")));
4268 :
4269 : Assert(ARR_ELEMTYPE(namespaces) == TEXTOID);
4270 :
4271 126 : deconstruct_array_builtin(namespaces, TEXTOID,
4272 : &ns_names_uris, &ns_names_uris_nulls,
4273 : &ns_count);
4274 :
4275 : Assert((ns_count % 2) == 0); /* checked above */
4276 126 : ns_count /= 2; /* count pairs only */
4277 : }
4278 : else
4279 : {
4280 432 : ns_names_uris = NULL;
4281 432 : ns_names_uris_nulls = NULL;
4282 432 : ns_count = 0;
4283 : }
4284 :
4285 558 : datastr = VARDATA(data);
4286 558 : len = VARSIZE(data) - VARHDRSZ;
4287 558 : xpath_len = VARSIZE_ANY_EXHDR(xpath_expr_text);
4288 558 : if (xpath_len == 0)
4289 6 : ereport(ERROR,
4290 : (errcode(ERRCODE_DATA_EXCEPTION),
4291 : errmsg("empty XPath expression")));
4292 :
4293 552 : string = pg_xmlCharStrndup(datastr, len);
4294 552 : xpath_expr = pg_xmlCharStrndup(VARDATA_ANY(xpath_expr_text), xpath_len);
4295 :
4296 : /*
4297 : * In a UTF8 database, skip any xml declaration, which might assert
4298 : * another encoding. Ignore parse_xml_decl() failure, letting
4299 : * xmlCtxtReadMemory() report parse errors. Documentation disclaims
4300 : * xpath() support for non-ASCII data in non-UTF8 databases, so leave
4301 : * those scenarios bug-compatible with historical behavior.
4302 : */
4303 552 : if (GetDatabaseEncoding() == PG_UTF8)
4304 552 : parse_xml_decl(string, &xmldecl_len, NULL, NULL, NULL);
4305 :
4306 552 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
4307 :
4308 552 : PG_TRY();
4309 : {
4310 552 : xmlInitParser();
4311 :
4312 : /*
4313 : * redundant XML parsing (two parsings for the same value during one
4314 : * command execution are possible)
4315 : */
4316 552 : ctxt = xmlNewParserCtxt();
4317 552 : if (ctxt == NULL || xmlerrcxt->err_occurred)
4318 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4319 : "could not allocate parser context");
4320 1104 : doc = xmlCtxtReadMemory(ctxt, (char *) string + xmldecl_len,
4321 552 : len - xmldecl_len, NULL, NULL, 0);
4322 552 : if (doc == NULL || xmlerrcxt->err_occurred)
4323 12 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
4324 : "could not parse XML document");
4325 540 : xpathctx = xmlXPathNewContext(doc);
4326 540 : if (xpathctx == NULL || xmlerrcxt->err_occurred)
4327 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4328 : "could not allocate XPath context");
4329 540 : xpathctx->node = (xmlNodePtr) doc;
4330 :
4331 : /* register namespaces, if any */
4332 540 : if (ns_count > 0)
4333 : {
4334 252 : for (i = 0; i < ns_count; i++)
4335 : {
4336 : char *ns_name;
4337 : char *ns_uri;
4338 :
4339 126 : if (ns_names_uris_nulls[i * 2] ||
4340 126 : ns_names_uris_nulls[i * 2 + 1])
4341 0 : ereport(ERROR,
4342 : (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
4343 : errmsg("neither namespace name nor URI may be null")));
4344 126 : ns_name = TextDatumGetCString(ns_names_uris[i * 2]);
4345 126 : ns_uri = TextDatumGetCString(ns_names_uris[i * 2 + 1]);
4346 126 : if (xmlXPathRegisterNs(xpathctx,
4347 : (xmlChar *) ns_name,
4348 : (xmlChar *) ns_uri) != 0)
4349 0 : ereport(ERROR, /* is this an internal error??? */
4350 : (errmsg("could not register XML namespace with name \"%s\" and URI \"%s\"",
4351 : ns_name, ns_uri)));
4352 : }
4353 : }
4354 :
4355 540 : xpathcomp = xmlXPathCompile(xpath_expr);
4356 540 : if (xpathcomp == NULL || xmlerrcxt->err_occurred)
4357 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4358 : "invalid XPath expression");
4359 :
4360 : /*
4361 : * Version 2.6.27 introduces a function named
4362 : * xmlXPathCompiledEvalToBoolean, which would be enough for xmlexists,
4363 : * but we can derive the existence by whether any nodes are returned,
4364 : * thereby preventing a library version upgrade and keeping the code
4365 : * the same.
4366 : */
4367 540 : xpathobj = xmlXPathCompiledEval(xpathcomp, xpathctx);
4368 540 : if (xpathobj == NULL || xmlerrcxt->err_occurred)
4369 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4370 : "could not create XPath object");
4371 :
4372 : /*
4373 : * Extract the results as requested.
4374 : */
4375 540 : if (res_nitems != NULL)
4376 432 : *res_nitems = xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
4377 : else
4378 108 : (void) xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
4379 : }
4380 12 : PG_CATCH();
4381 : {
4382 12 : if (xpathobj)
4383 0 : xmlXPathFreeObject(xpathobj);
4384 12 : if (xpathcomp)
4385 0 : xmlXPathFreeCompExpr(xpathcomp);
4386 12 : if (xpathctx)
4387 0 : xmlXPathFreeContext(xpathctx);
4388 12 : if (doc)
4389 12 : xmlFreeDoc(doc);
4390 12 : if (ctxt)
4391 12 : xmlFreeParserCtxt(ctxt);
4392 :
4393 12 : pg_xml_done(xmlerrcxt, true);
4394 :
4395 12 : PG_RE_THROW();
4396 : }
4397 540 : PG_END_TRY();
4398 :
4399 540 : xmlXPathFreeObject(xpathobj);
4400 540 : xmlXPathFreeCompExpr(xpathcomp);
4401 540 : xmlXPathFreeContext(xpathctx);
4402 540 : xmlFreeDoc(doc);
4403 540 : xmlFreeParserCtxt(ctxt);
4404 :
4405 540 : pg_xml_done(xmlerrcxt, false);
4406 540 : }
4407 : #endif /* USE_LIBXML */
4408 :
4409 : /*
4410 : * Evaluate XPath expression and return array of XML values.
4411 : *
4412 : * As we have no support of XQuery sequences yet, this function seems
4413 : * to be the most useful one (array of XML functions plays a role of
4414 : * some kind of substitution for XQuery sequences).
4415 : */
4416 : Datum
4417 126 : xpath(PG_FUNCTION_ARGS)
4418 : {
4419 : #ifdef USE_LIBXML
4420 126 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4421 126 : xmltype *data = PG_GETARG_XML_P(1);
4422 126 : ArrayType *namespaces = PG_GETARG_ARRAYTYPE_P(2);
4423 : ArrayBuildState *astate;
4424 :
4425 126 : astate = initArrayResult(XMLOID, CurrentMemoryContext, true);
4426 126 : xpath_internal(xpath_expr_text, data, namespaces,
4427 : NULL, astate);
4428 108 : PG_RETURN_DATUM(makeArrayResult(astate, CurrentMemoryContext));
4429 : #else
4430 : NO_XML_SUPPORT();
4431 : return 0;
4432 : #endif
4433 : }
4434 :
4435 : /*
4436 : * Determines if the node specified by the supplied XPath exists
4437 : * in a given XML document, returning a boolean.
4438 : */
4439 : Datum
4440 198 : xmlexists(PG_FUNCTION_ARGS)
4441 : {
4442 : #ifdef USE_LIBXML
4443 198 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4444 198 : xmltype *data = PG_GETARG_XML_P(1);
4445 : int res_nitems;
4446 :
4447 198 : xpath_internal(xpath_expr_text, data, NULL,
4448 : &res_nitems, NULL);
4449 :
4450 198 : PG_RETURN_BOOL(res_nitems > 0);
4451 : #else
4452 : NO_XML_SUPPORT();
4453 : return 0;
4454 : #endif
4455 : }
4456 :
4457 : /*
4458 : * Determines if the node specified by the supplied XPath exists
4459 : * in a given XML document, returning a boolean. Differs from
4460 : * xmlexists as it supports namespaces and is not defined in SQL/XML.
4461 : */
4462 : Datum
4463 234 : xpath_exists(PG_FUNCTION_ARGS)
4464 : {
4465 : #ifdef USE_LIBXML
4466 234 : text *xpath_expr_text = PG_GETARG_TEXT_PP(0);
4467 234 : xmltype *data = PG_GETARG_XML_P(1);
4468 234 : ArrayType *namespaces = PG_GETARG_ARRAYTYPE_P(2);
4469 : int res_nitems;
4470 :
4471 234 : xpath_internal(xpath_expr_text, data, namespaces,
4472 : &res_nitems, NULL);
4473 :
4474 234 : PG_RETURN_BOOL(res_nitems > 0);
4475 : #else
4476 : NO_XML_SUPPORT();
4477 : return 0;
4478 : #endif
4479 : }
4480 :
4481 : /*
4482 : * Functions for checking well-formed-ness
4483 : */
4484 :
4485 : #ifdef USE_LIBXML
4486 : static bool
4487 114 : wellformed_xml(text *data, XmlOptionType xmloption_arg)
4488 : {
4489 : xmlDocPtr doc;
4490 114 : ErrorSaveContext escontext = {T_ErrorSaveContext};
4491 :
4492 : /*
4493 : * We'll report "true" if no soft error is reported by xml_parse().
4494 : */
4495 114 : doc = xml_parse(data, xmloption_arg, true,
4496 : GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
4497 114 : if (doc)
4498 60 : xmlFreeDoc(doc);
4499 :
4500 114 : return !escontext.error_occurred;
4501 : }
4502 : #endif
4503 :
4504 : Datum
4505 90 : xml_is_well_formed(PG_FUNCTION_ARGS)
4506 : {
4507 : #ifdef USE_LIBXML
4508 90 : text *data = PG_GETARG_TEXT_PP(0);
4509 :
4510 90 : PG_RETURN_BOOL(wellformed_xml(data, xmloption));
4511 : #else
4512 : NO_XML_SUPPORT();
4513 : return 0;
4514 : #endif /* not USE_LIBXML */
4515 : }
4516 :
4517 : Datum
4518 12 : xml_is_well_formed_document(PG_FUNCTION_ARGS)
4519 : {
4520 : #ifdef USE_LIBXML
4521 12 : text *data = PG_GETARG_TEXT_PP(0);
4522 :
4523 12 : PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_DOCUMENT));
4524 : #else
4525 : NO_XML_SUPPORT();
4526 : return 0;
4527 : #endif /* not USE_LIBXML */
4528 : }
4529 :
4530 : Datum
4531 12 : xml_is_well_formed_content(PG_FUNCTION_ARGS)
4532 : {
4533 : #ifdef USE_LIBXML
4534 12 : text *data = PG_GETARG_TEXT_PP(0);
4535 :
4536 12 : PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_CONTENT));
4537 : #else
4538 : NO_XML_SUPPORT();
4539 : return 0;
4540 : #endif /* not USE_LIBXML */
4541 : }
4542 :
4543 : /*
4544 : * support functions for XMLTABLE
4545 : *
4546 : */
4547 : #ifdef USE_LIBXML
4548 :
4549 : /*
4550 : * Returns private data from executor state. Ensure validity by check with
4551 : * MAGIC number.
4552 : */
4553 : static inline XmlTableBuilderData *
4554 155048 : GetXmlTableBuilderPrivateData(TableFuncScanState *state, const char *fname)
4555 : {
4556 : XmlTableBuilderData *result;
4557 :
4558 155048 : if (!IsA(state, TableFuncScanState))
4559 0 : elog(ERROR, "%s called with invalid TableFuncScanState", fname);
4560 155048 : result = (XmlTableBuilderData *) state->opaque;
4561 155048 : if (result->magic != XMLTABLE_CONTEXT_MAGIC)
4562 0 : elog(ERROR, "%s called with invalid TableFuncScanState", fname);
4563 :
4564 155048 : return result;
4565 : }
4566 : #endif
4567 :
4568 : /*
4569 : * XmlTableInitOpaque
4570 : * Fill in TableFuncScanState->opaque for XmlTable processor; initialize
4571 : * the XML parser.
4572 : *
4573 : * Note: Because we call pg_xml_init() here and pg_xml_done() in
4574 : * XmlTableDestroyOpaque, it is critical for robustness that no other
4575 : * executor nodes run until this node is processed to completion. Caller
4576 : * must execute this to completion (probably filling a tuplestore to exhaust
4577 : * this node in a single pass) instead of using row-per-call mode.
4578 : */
4579 : static void
4580 264 : XmlTableInitOpaque(TableFuncScanState *state, int natts)
4581 : {
4582 : #ifdef USE_LIBXML
4583 264 : volatile xmlParserCtxtPtr ctxt = NULL;
4584 : XmlTableBuilderData *xtCxt;
4585 : PgXmlErrorContext *xmlerrcxt;
4586 :
4587 264 : xtCxt = palloc0(sizeof(XmlTableBuilderData));
4588 264 : xtCxt->magic = XMLTABLE_CONTEXT_MAGIC;
4589 264 : xtCxt->natts = natts;
4590 264 : xtCxt->xpathscomp = palloc0(sizeof(xmlXPathCompExprPtr) * natts);
4591 :
4592 264 : xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
4593 :
4594 264 : PG_TRY();
4595 : {
4596 264 : xmlInitParser();
4597 :
4598 264 : ctxt = xmlNewParserCtxt();
4599 264 : if (ctxt == NULL || xmlerrcxt->err_occurred)
4600 0 : xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4601 : "could not allocate parser context");
4602 : }
4603 0 : PG_CATCH();
4604 : {
4605 0 : if (ctxt != NULL)
4606 0 : xmlFreeParserCtxt(ctxt);
4607 :
4608 0 : pg_xml_done(xmlerrcxt, true);
4609 :
4610 0 : PG_RE_THROW();
4611 : }
4612 264 : PG_END_TRY();
4613 :
4614 264 : xtCxt->xmlerrcxt = xmlerrcxt;
4615 264 : xtCxt->ctxt = ctxt;
4616 :
4617 264 : state->opaque = xtCxt;
4618 : #else
4619 : NO_XML_SUPPORT();
4620 : #endif /* not USE_LIBXML */
4621 264 : }
4622 :
4623 : /*
4624 : * XmlTableSetDocument
4625 : * Install the input document
4626 : */
4627 : static void
4628 264 : XmlTableSetDocument(TableFuncScanState *state, Datum value)
4629 : {
4630 : #ifdef USE_LIBXML
4631 : XmlTableBuilderData *xtCxt;
4632 264 : xmltype *xmlval = DatumGetXmlP(value);
4633 : char *str;
4634 : xmlChar *xstr;
4635 : int length;
4636 264 : volatile xmlDocPtr doc = NULL;
4637 264 : volatile xmlXPathContextPtr xpathcxt = NULL;
4638 :
4639 264 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetDocument");
4640 :
4641 : /*
4642 : * Use out function for casting to string (remove encoding property). See
4643 : * comment in xml_out.
4644 : */
4645 264 : str = xml_out_internal(xmlval, 0);
4646 :
4647 264 : length = strlen(str);
4648 264 : xstr = pg_xmlCharStrndup(str, length);
4649 :
4650 264 : PG_TRY();
4651 : {
4652 264 : doc = xmlCtxtReadMemory(xtCxt->ctxt, (char *) xstr, length, NULL, NULL, 0);
4653 264 : if (doc == NULL || xtCxt->xmlerrcxt->err_occurred)
4654 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
4655 : "could not parse XML document");
4656 264 : xpathcxt = xmlXPathNewContext(doc);
4657 264 : if (xpathcxt == NULL || xtCxt->xmlerrcxt->err_occurred)
4658 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
4659 : "could not allocate XPath context");
4660 264 : xpathcxt->node = (xmlNodePtr) doc;
4661 : }
4662 0 : PG_CATCH();
4663 : {
4664 0 : if (xpathcxt != NULL)
4665 0 : xmlXPathFreeContext(xpathcxt);
4666 0 : if (doc != NULL)
4667 0 : xmlFreeDoc(doc);
4668 :
4669 0 : PG_RE_THROW();
4670 : }
4671 264 : PG_END_TRY();
4672 :
4673 264 : xtCxt->doc = doc;
4674 264 : xtCxt->xpathcxt = xpathcxt;
4675 : #else
4676 : NO_XML_SUPPORT();
4677 : #endif /* not USE_LIBXML */
4678 264 : }
4679 :
4680 : /*
4681 : * XmlTableSetNamespace
4682 : * Add a namespace declaration
4683 : */
4684 : static void
4685 18 : XmlTableSetNamespace(TableFuncScanState *state, const char *name, const char *uri)
4686 : {
4687 : #ifdef USE_LIBXML
4688 : XmlTableBuilderData *xtCxt;
4689 :
4690 18 : if (name == NULL)
4691 6 : ereport(ERROR,
4692 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4693 : errmsg("DEFAULT namespace is not supported")));
4694 12 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetNamespace");
4695 :
4696 12 : if (xmlXPathRegisterNs(xtCxt->xpathcxt,
4697 12 : pg_xmlCharStrndup(name, strlen(name)),
4698 12 : pg_xmlCharStrndup(uri, strlen(uri))))
4699 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
4700 : "could not set XML namespace");
4701 : #else
4702 : NO_XML_SUPPORT();
4703 : #endif /* not USE_LIBXML */
4704 12 : }
4705 :
4706 : /*
4707 : * XmlTableSetRowFilter
4708 : * Install the row-filter Xpath expression.
4709 : */
4710 : static void
4711 258 : XmlTableSetRowFilter(TableFuncScanState *state, const char *path)
4712 : {
4713 : #ifdef USE_LIBXML
4714 : XmlTableBuilderData *xtCxt;
4715 : xmlChar *xstr;
4716 :
4717 258 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetRowFilter");
4718 :
4719 258 : if (*path == '\0')
4720 0 : ereport(ERROR,
4721 : (errcode(ERRCODE_DATA_EXCEPTION),
4722 : errmsg("row path filter must not be empty string")));
4723 :
4724 258 : xstr = pg_xmlCharStrndup(path, strlen(path));
4725 :
4726 258 : xtCxt->xpathcomp = xmlXPathCompile(xstr);
4727 258 : if (xtCxt->xpathcomp == NULL || xtCxt->xmlerrcxt->err_occurred)
4728 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_SYNTAX_ERROR,
4729 : "invalid XPath expression");
4730 : #else
4731 : NO_XML_SUPPORT();
4732 : #endif /* not USE_LIBXML */
4733 258 : }
4734 :
4735 : /*
4736 : * XmlTableSetColumnFilter
4737 : * Install the column-filter Xpath expression, for the given column.
4738 : */
4739 : static void
4740 774 : XmlTableSetColumnFilter(TableFuncScanState *state, const char *path, int colnum)
4741 : {
4742 : #ifdef USE_LIBXML
4743 : XmlTableBuilderData *xtCxt;
4744 : xmlChar *xstr;
4745 :
4746 : Assert(PointerIsValid(path));
4747 :
4748 774 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetColumnFilter");
4749 :
4750 774 : if (*path == '\0')
4751 0 : ereport(ERROR,
4752 : (errcode(ERRCODE_DATA_EXCEPTION),
4753 : errmsg("column path filter must not be empty string")));
4754 :
4755 774 : xstr = pg_xmlCharStrndup(path, strlen(path));
4756 :
4757 774 : xtCxt->xpathscomp[colnum] = xmlXPathCompile(xstr);
4758 774 : if (xtCxt->xpathscomp[colnum] == NULL || xtCxt->xmlerrcxt->err_occurred)
4759 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
4760 : "invalid XPath expression");
4761 : #else
4762 : NO_XML_SUPPORT();
4763 : #endif /* not USE_LIBXML */
4764 774 : }
4765 :
4766 : /*
4767 : * XmlTableFetchRow
4768 : * Prepare the next "current" tuple for upcoming GetValue calls.
4769 : * Returns false if the row-filter expression returned no more rows.
4770 : */
4771 : static bool
4772 22286 : XmlTableFetchRow(TableFuncScanState *state)
4773 : {
4774 : #ifdef USE_LIBXML
4775 : XmlTableBuilderData *xtCxt;
4776 :
4777 22286 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableFetchRow");
4778 :
4779 : /* Propagate our own error context to libxml2 */
4780 22286 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
4781 :
4782 22286 : if (xtCxt->xpathobj == NULL)
4783 : {
4784 258 : xtCxt->xpathobj = xmlXPathCompiledEval(xtCxt->xpathcomp, xtCxt->xpathcxt);
4785 258 : if (xtCxt->xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
4786 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4787 : "could not create XPath object");
4788 :
4789 258 : xtCxt->row_count = 0;
4790 : }
4791 :
4792 22286 : if (xtCxt->xpathobj->type == XPATH_NODESET)
4793 : {
4794 22286 : if (xtCxt->xpathobj->nodesetval != NULL)
4795 : {
4796 22286 : if (xtCxt->row_count++ < xtCxt->xpathobj->nodesetval->nodeNr)
4797 22040 : return true;
4798 : }
4799 : }
4800 :
4801 246 : return false;
4802 : #else
4803 : NO_XML_SUPPORT();
4804 : return false;
4805 : #endif /* not USE_LIBXML */
4806 : }
4807 :
4808 : /*
4809 : * XmlTableGetValue
4810 : * Return the value for column number 'colnum' for the current row. If
4811 : * column -1 is requested, return representation of the whole row.
4812 : *
4813 : * This leaks memory, so be sure to reset often the context in which it's
4814 : * called.
4815 : */
4816 : static Datum
4817 131190 : XmlTableGetValue(TableFuncScanState *state, int colnum,
4818 : Oid typid, int32 typmod, bool *isnull)
4819 : {
4820 : #ifdef USE_LIBXML
4821 : XmlTableBuilderData *xtCxt;
4822 131190 : Datum result = (Datum) 0;
4823 : xmlNodePtr cur;
4824 131190 : char *cstr = NULL;
4825 131190 : volatile xmlXPathObjectPtr xpathobj = NULL;
4826 :
4827 131190 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableGetValue");
4828 :
4829 : Assert(xtCxt->xpathobj &&
4830 : xtCxt->xpathobj->type == XPATH_NODESET &&
4831 : xtCxt->xpathobj->nodesetval != NULL);
4832 :
4833 : /* Propagate our own error context to libxml2 */
4834 131190 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
4835 :
4836 131190 : *isnull = false;
4837 :
4838 131190 : cur = xtCxt->xpathobj->nodesetval->nodeTab[xtCxt->row_count - 1];
4839 :
4840 : Assert(xtCxt->xpathscomp[colnum] != NULL);
4841 :
4842 131190 : PG_TRY();
4843 : {
4844 : /* Set current node as entry point for XPath evaluation */
4845 131190 : xtCxt->xpathcxt->node = cur;
4846 :
4847 : /* Evaluate column path */
4848 131190 : xpathobj = xmlXPathCompiledEval(xtCxt->xpathscomp[colnum], xtCxt->xpathcxt);
4849 131190 : if (xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
4850 0 : xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
4851 : "could not create XPath object");
4852 :
4853 : /*
4854 : * There are four possible cases, depending on the number of nodes
4855 : * returned by the XPath expression and the type of the target column:
4856 : * a) XPath returns no nodes. b) The target type is XML (return all
4857 : * as XML). For non-XML return types: c) One node (return content).
4858 : * d) Multiple nodes (error).
4859 : */
4860 131190 : if (xpathobj->type == XPATH_NODESET)
4861 : {
4862 131160 : int count = 0;
4863 :
4864 131160 : if (xpathobj->nodesetval != NULL)
4865 130950 : count = xpathobj->nodesetval->nodeNr;
4866 :
4867 131160 : if (xpathobj->nodesetval == NULL || count == 0)
4868 : {
4869 22272 : *isnull = true;
4870 : }
4871 : else
4872 : {
4873 108888 : if (typid == XMLOID)
4874 : {
4875 : text *textstr;
4876 : StringInfoData str;
4877 :
4878 : /* Concatenate serialized values */
4879 72 : initStringInfo(&str);
4880 174 : for (int i = 0; i < count; i++)
4881 : {
4882 : textstr =
4883 102 : xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
4884 : xtCxt->xmlerrcxt);
4885 :
4886 102 : appendStringInfoText(&str, textstr);
4887 : }
4888 72 : cstr = str.data;
4889 : }
4890 : else
4891 : {
4892 : xmlChar *str;
4893 :
4894 108816 : if (count > 1)
4895 6 : ereport(ERROR,
4896 : (errcode(ERRCODE_CARDINALITY_VIOLATION),
4897 : errmsg("more than one value returned by column XPath expression")));
4898 :
4899 108810 : str = xmlXPathCastNodeSetToString(xpathobj->nodesetval);
4900 108810 : cstr = str ? xml_pstrdup_and_free(str) : "";
4901 : }
4902 : }
4903 : }
4904 30 : else if (xpathobj->type == XPATH_STRING)
4905 : {
4906 : /* Content should be escaped when target will be XML */
4907 18 : if (typid == XMLOID)
4908 6 : cstr = escape_xml((char *) xpathobj->stringval);
4909 : else
4910 12 : cstr = (char *) xpathobj->stringval;
4911 : }
4912 12 : else if (xpathobj->type == XPATH_BOOLEAN)
4913 : {
4914 : char typcategory;
4915 : bool typispreferred;
4916 : xmlChar *str;
4917 :
4918 : /* Allow implicit casting from boolean to numbers */
4919 6 : get_type_category_preferred(typid, &typcategory, &typispreferred);
4920 :
4921 6 : if (typcategory != TYPCATEGORY_NUMERIC)
4922 6 : str = xmlXPathCastBooleanToString(xpathobj->boolval);
4923 : else
4924 0 : str = xmlXPathCastNumberToString(xmlXPathCastBooleanToNumber(xpathobj->boolval));
4925 :
4926 6 : cstr = xml_pstrdup_and_free(str);
4927 : }
4928 6 : else if (xpathobj->type == XPATH_NUMBER)
4929 : {
4930 : xmlChar *str;
4931 :
4932 6 : str = xmlXPathCastNumberToString(xpathobj->floatval);
4933 6 : cstr = xml_pstrdup_and_free(str);
4934 : }
4935 : else
4936 0 : elog(ERROR, "unexpected XPath object type %u", xpathobj->type);
4937 :
4938 : /*
4939 : * By here, either cstr contains the result value, or the isnull flag
4940 : * has been set.
4941 : */
4942 : Assert(cstr || *isnull);
4943 :
4944 131184 : if (!*isnull)
4945 108912 : result = InputFunctionCall(&state->in_functions[colnum],
4946 : cstr,
4947 108912 : state->typioparams[colnum],
4948 : typmod);
4949 : }
4950 6 : PG_FINALLY();
4951 : {
4952 131190 : if (xpathobj != NULL)
4953 131190 : xmlXPathFreeObject(xpathobj);
4954 : }
4955 131190 : PG_END_TRY();
4956 :
4957 131184 : return result;
4958 : #else
4959 : NO_XML_SUPPORT();
4960 : return 0;
4961 : #endif /* not USE_LIBXML */
4962 : }
4963 :
4964 : /*
4965 : * XmlTableDestroyOpaque
4966 : * Release all libxml2 resources
4967 : */
4968 : static void
4969 264 : XmlTableDestroyOpaque(TableFuncScanState *state)
4970 : {
4971 : #ifdef USE_LIBXML
4972 : XmlTableBuilderData *xtCxt;
4973 :
4974 264 : xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableDestroyOpaque");
4975 :
4976 : /* Propagate our own error context to libxml2 */
4977 264 : xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
4978 :
4979 264 : if (xtCxt->xpathscomp != NULL)
4980 : {
4981 : int i;
4982 :
4983 1116 : for (i = 0; i < xtCxt->natts; i++)
4984 852 : if (xtCxt->xpathscomp[i] != NULL)
4985 774 : xmlXPathFreeCompExpr(xtCxt->xpathscomp[i]);
4986 : }
4987 :
4988 264 : if (xtCxt->xpathobj != NULL)
4989 258 : xmlXPathFreeObject(xtCxt->xpathobj);
4990 264 : if (xtCxt->xpathcomp != NULL)
4991 258 : xmlXPathFreeCompExpr(xtCxt->xpathcomp);
4992 264 : if (xtCxt->xpathcxt != NULL)
4993 264 : xmlXPathFreeContext(xtCxt->xpathcxt);
4994 264 : if (xtCxt->doc != NULL)
4995 264 : xmlFreeDoc(xtCxt->doc);
4996 264 : if (xtCxt->ctxt != NULL)
4997 264 : xmlFreeParserCtxt(xtCxt->ctxt);
4998 :
4999 264 : pg_xml_done(xtCxt->xmlerrcxt, true);
5000 :
5001 : /* not valid anymore */
5002 264 : xtCxt->magic = 0;
5003 264 : state->opaque = NULL;
5004 :
5005 : #else
5006 : NO_XML_SUPPORT();
5007 : #endif /* not USE_LIBXML */
5008 264 : }
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