1/*
2   +----------------------------------------------------------------------+
3   | PHP Version 7                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2016 The PHP Group                                |
6   +----------------------------------------------------------------------+
7   | This source file is subject to version 3.01 of the PHP license,      |
8   | that is bundled with this package in the file LICENSE, and is        |
9   | available through the world-wide-web at the following url:           |
10   | http://www.php.net/license/3_01.txt                                  |
11   | If you did not receive a copy of the PHP license and are unable to   |
12   | obtain it through the world-wide-web, please send a note to          |
13   | license@php.net so we can mail you a copy immediately.               |
14   +----------------------------------------------------------------------+
15   | Authors: Christian Stocker <chregu@php.net>                          |
16   |          Rob Richards <rrichards@php.net>                            |
17   +----------------------------------------------------------------------+
18*/
19
20/* $Id$ */
21
22#ifdef HAVE_CONFIG_H
23#include "config.h"
24#endif
25
26#include "php.h"
27#if HAVE_LIBXML && HAVE_DOM
28#include "php_dom.h"
29
30#define PHP_DOM_XPATH_QUERY 0
31#define PHP_DOM_XPATH_EVALUATE 1
32
33/*
34* class DOMXPath
35*/
36
37#if defined(LIBXML_XPATH_ENABLED)
38
39/* {{{ arginfo */
40ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_construct, 0, 0, 1)
41	ZEND_ARG_OBJ_INFO(0, doc, DOMDocument, 0)
42ZEND_END_ARG_INFO();
43
44ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_register_ns, 0, 0, 2)
45	ZEND_ARG_INFO(0, prefix)
46	ZEND_ARG_INFO(0, uri)
47ZEND_END_ARG_INFO();
48
49ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_query, 0, 0, 1)
50	ZEND_ARG_INFO(0, expr)
51	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 1)
52	ZEND_ARG_INFO(0, registerNodeNS)
53ZEND_END_ARG_INFO();
54
55ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_evaluate, 0, 0, 1)
56	ZEND_ARG_INFO(0, expr)
57	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 1)
58	ZEND_ARG_INFO(0, registerNodeNS)
59ZEND_END_ARG_INFO();
60
61ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_register_php_functions, 0, 0, 0)
62ZEND_END_ARG_INFO();
63/* }}} */
64
65const zend_function_entry php_dom_xpath_class_functions[] = {
66	PHP_ME(domxpath, __construct, arginfo_dom_xpath_construct, ZEND_ACC_PUBLIC)
67	PHP_FALIAS(registerNamespace, dom_xpath_register_ns, arginfo_dom_xpath_register_ns)
68	PHP_FALIAS(query, dom_xpath_query, arginfo_dom_xpath_query)
69	PHP_FALIAS(evaluate, dom_xpath_evaluate, arginfo_dom_xpath_evaluate)
70	PHP_FALIAS(registerPhpFunctions, dom_xpath_register_php_functions, arginfo_dom_xpath_register_php_functions)
71	PHP_FE_END
72};
73
74
75static void dom_xpath_ext_function_php(xmlXPathParserContextPtr ctxt, int nargs, int type) /* {{{ */
76{
77	zval retval;
78	int result, i;
79	int error = 0;
80	zend_fcall_info fci;
81	xmlXPathObjectPtr obj;
82	char *str;
83	zend_string *callable = NULL;
84	dom_xpath_object *intern;
85
86
87	if (! zend_is_executing()) {
88		xmlGenericError(xmlGenericErrorContext,
89		"xmlExtFunctionTest: Function called from outside of PHP\n");
90		error = 1;
91	} else {
92		intern = (dom_xpath_object *) ctxt->context->userData;
93		if (intern == NULL) {
94			xmlGenericError(xmlGenericErrorContext,
95			"xmlExtFunctionTest: failed to get the internal object\n");
96			error = 1;
97		}
98		else if (intern->registerPhpFunctions == 0) {
99			xmlGenericError(xmlGenericErrorContext,
100			"xmlExtFunctionTest: PHP Object did not register PHP functions\n");
101			error = 1;
102		}
103	}
104
105	if (error == 1) {
106		for (i = nargs - 1; i >= 0; i--) {
107			obj = valuePop(ctxt);
108			xmlXPathFreeObject(obj);
109		}
110		return;
111	}
112
113	fci.param_count = nargs - 1;
114	if (fci.param_count > 0) {
115		fci.params = safe_emalloc(fci.param_count, sizeof(zval), 0);
116	}
117	/* Reverse order to pop values off ctxt stack */
118	for (i = nargs - 2; i >= 0; i--) {
119		obj = valuePop(ctxt);
120		switch (obj->type) {
121			case XPATH_STRING:
122				ZVAL_STRING(&fci.params[i],  (char *)obj->stringval);
123				break;
124			case XPATH_BOOLEAN:
125				ZVAL_BOOL(&fci.params[i],  obj->boolval);
126				break;
127			case XPATH_NUMBER:
128				ZVAL_DOUBLE(&fci.params[i], obj->floatval);
129				break;
130			case XPATH_NODESET:
131				if (type == 1) {
132					str = (char *)xmlXPathCastToString(obj);
133					ZVAL_STRING(&fci.params[i], str);
134					xmlFree(str);
135				} else if (type == 2) {
136					int j;
137					array_init(&fci.params[i]);
138					if (obj->nodesetval && obj->nodesetval->nodeNr > 0) {
139						for (j = 0; j < obj->nodesetval->nodeNr; j++) {
140							xmlNodePtr node = obj->nodesetval->nodeTab[j];
141							zval child;
142							/* not sure, if we need this... it's copied from xpath.c */
143							if (node->type == XML_NAMESPACE_DECL) {
144								xmlNsPtr curns;
145								xmlNodePtr nsparent;
146
147								nsparent = node->_private;
148								curns = xmlNewNs(NULL, node->name, NULL);
149								if (node->children) {
150									curns->prefix = xmlStrdup((xmlChar *) node->children);
151								}
152								if (node->children) {
153									node = xmlNewDocNode(node->doc, NULL, (xmlChar *) node->children, node->name);
154								} else {
155									node = xmlNewDocNode(node->doc, NULL, (xmlChar *) "xmlns", node->name);
156								}
157								node->type = XML_NAMESPACE_DECL;
158								node->parent = nsparent;
159								node->ns = curns;
160							}
161							php_dom_create_object(node, &child, &intern->dom);
162							add_next_index_zval(&fci.params[i], &child);
163						}
164					}
165				}
166				break;
167			default:
168			ZVAL_STRING(&fci.params[i], (char *)xmlXPathCastToString(obj));
169		}
170		xmlXPathFreeObject(obj);
171	}
172
173	fci.size = sizeof(fci);
174
175	obj = valuePop(ctxt);
176	if (obj->stringval == NULL) {
177		php_error_docref(NULL, E_WARNING, "Handler name must be a string");
178		xmlXPathFreeObject(obj);
179		if (fci.param_count > 0) {
180			for (i = 0; i < nargs - 1; i++) {
181				zval_ptr_dtor(&fci.params[i]);
182			}
183			efree(fci.params);
184		}
185		return;
186	}
187	ZVAL_STRING(&fci.function_name, (char *) obj->stringval);
188	xmlXPathFreeObject(obj);
189
190	fci.object = NULL;
191	fci.retval = &retval;
192	fci.no_separation = 0;
193
194	if (!zend_make_callable(&fci.function_name, &callable)) {
195		php_error_docref(NULL, E_WARNING, "Unable to call handler %s()", ZSTR_VAL(callable));
196	} else if (intern->registerPhpFunctions == 2 && zend_hash_exists(intern->registered_phpfunctions, callable) == 0) {
197		php_error_docref(NULL, E_WARNING, "Not allowed to call handler '%s()'.", ZSTR_VAL(callable));
198		/* Push an empty string, so that we at least have an xslt result... */
199		valuePush(ctxt, xmlXPathNewString((xmlChar *)""));
200	} else {
201		result = zend_call_function(&fci, NULL);
202		if (result == SUCCESS && Z_TYPE(retval) != IS_UNDEF) {
203			if (Z_TYPE(retval) == IS_OBJECT && instanceof_function(Z_OBJCE(retval), dom_node_class_entry)) {
204				xmlNode *nodep;
205				dom_object *obj;
206				if (intern->node_list == NULL) {
207					ALLOC_HASHTABLE(intern->node_list);
208					zend_hash_init(intern->node_list, 0, NULL, ZVAL_PTR_DTOR, 0);
209				}
210				Z_ADDREF(retval);
211				zend_hash_next_index_insert(intern->node_list, &retval);
212				obj = Z_DOMOBJ_P(&retval);
213				nodep = dom_object_get_node(obj);
214				valuePush(ctxt, xmlXPathNewNodeSet(nodep));
215			} else if (Z_TYPE(retval) == IS_FALSE || Z_TYPE(retval) == IS_TRUE) {
216				valuePush(ctxt, xmlXPathNewBoolean(Z_TYPE(retval) == IS_TRUE));
217			} else if (Z_TYPE(retval) == IS_OBJECT) {
218				php_error_docref(NULL, E_WARNING, "A PHP Object cannot be converted to a XPath-string");
219				valuePush(ctxt, xmlXPathNewString((xmlChar *)""));
220			} else {
221				zend_string *str = zval_get_string(&retval);
222				valuePush(ctxt, xmlXPathNewString((xmlChar *) ZSTR_VAL(str)));
223				zend_string_release(str);
224			}
225			zval_ptr_dtor(&retval);
226		}
227	}
228	zend_string_release(callable);
229	zval_dtor(&fci.function_name);
230	if (fci.param_count > 0) {
231		for (i = 0; i < nargs - 1; i++) {
232			zval_ptr_dtor(&fci.params[i]);
233		}
234		efree(fci.params);
235	}
236}
237/* }}} */
238
239static void dom_xpath_ext_function_string_php(xmlXPathParserContextPtr ctxt, int nargs) /* {{{ */
240{
241	dom_xpath_ext_function_php(ctxt, nargs, 1);
242}
243/* }}} */
244
245static void dom_xpath_ext_function_object_php(xmlXPathParserContextPtr ctxt, int nargs) /* {{{ */
246{
247	dom_xpath_ext_function_php(ctxt, nargs, 2);
248}
249/* }}} */
250
251/* {{{ proto void DOMXPath::__construct(DOMDocument doc) U */
252PHP_METHOD(domxpath, __construct)
253{
254	zval *id = getThis(), *doc;
255	xmlDocPtr docp = NULL;
256	dom_object *docobj;
257	dom_xpath_object *intern;
258	xmlXPathContextPtr ctx, oldctx;
259
260	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "O", &doc, dom_document_class_entry) == FAILURE) {
261		return;
262	}
263
264	DOM_GET_OBJ(docp, doc, xmlDocPtr, docobj);
265
266	ctx = xmlXPathNewContext(docp);
267	if (ctx == NULL) {
268		php_dom_throw_error(INVALID_STATE_ERR, 1);
269		RETURN_FALSE;
270	}
271
272	intern = Z_XPATHOBJ_P(id);
273	if (intern != NULL) {
274		oldctx = (xmlXPathContextPtr)intern->dom.ptr;
275		if (oldctx != NULL) {
276			php_libxml_decrement_doc_ref((php_libxml_node_object *) &intern->dom);
277			xmlXPathFreeContext(oldctx);
278		}
279
280		xmlXPathRegisterFuncNS (ctx, (const xmlChar *) "functionString",
281					   (const xmlChar *) "http://php.net/xpath",
282					   dom_xpath_ext_function_string_php);
283		xmlXPathRegisterFuncNS (ctx, (const xmlChar *) "function",
284					   (const xmlChar *) "http://php.net/xpath",
285					   dom_xpath_ext_function_object_php);
286
287		intern->dom.ptr = ctx;
288		ctx->userData = (void *)intern;
289		intern->dom.document = docobj->document;
290		php_libxml_increment_doc_ref((php_libxml_node_object *) &intern->dom, docp);
291	}
292}
293/* }}} end DOMXPath::__construct */
294
295/* {{{ document DOMDocument*/
296int dom_xpath_document_read(dom_object *obj, zval *retval)
297{
298	xmlDoc *docp = NULL;
299	xmlXPathContextPtr ctx = (xmlXPathContextPtr) obj->ptr;
300
301	if (ctx) {
302		docp = (xmlDocPtr) ctx->doc;
303	}
304
305	php_dom_create_object((xmlNodePtr) docp, retval, obj);
306	return SUCCESS;
307}
308/* }}} */
309
310/* {{{ proto boolean dom_xpath_register_ns(string prefix, string uri) */
311PHP_FUNCTION(dom_xpath_register_ns)
312{
313	zval *id;
314	xmlXPathContextPtr ctxp;
315	size_t prefix_len, ns_uri_len;
316	dom_xpath_object *intern;
317	unsigned char *prefix, *ns_uri;
318
319	if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(), "Oss", &id, dom_xpath_class_entry, &prefix, &prefix_len, &ns_uri, &ns_uri_len) == FAILURE) {
320		return;
321	}
322
323	intern = Z_XPATHOBJ_P(id);
324
325	ctxp = (xmlXPathContextPtr) intern->dom.ptr;
326	if (ctxp == NULL) {
327		php_error_docref(NULL, E_WARNING, "Invalid XPath Context");
328		RETURN_FALSE;
329	}
330
331	if (xmlXPathRegisterNs(ctxp, prefix, ns_uri) != 0) {
332		RETURN_FALSE
333	}
334	RETURN_TRUE;
335}
336/* }}} */
337
338static void dom_xpath_iter(zval *baseobj, dom_object *intern) /* {{{ */
339{
340	dom_nnodemap_object *mapptr = (dom_nnodemap_object *) intern->ptr;
341
342	ZVAL_COPY_VALUE(&mapptr->baseobj_zv, baseobj);
343	mapptr->nodetype = DOM_NODESET;
344}
345/* }}} */
346
347static void php_xpath_eval(INTERNAL_FUNCTION_PARAMETERS, int type) /* {{{ */
348{
349	zval *id, retval, *context = NULL;
350	xmlXPathContextPtr ctxp;
351	xmlNodePtr nodep = NULL;
352	xmlXPathObjectPtr xpathobjp;
353	size_t expr_len, nsnbr = 0, xpath_type;
354	dom_xpath_object *intern;
355	dom_object *nodeobj;
356	char *expr;
357	xmlDoc *docp = NULL;
358	xmlNsPtr *ns = NULL;
359	zend_bool register_node_ns = 1;
360
361	if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(), "Os|O!b", &id, dom_xpath_class_entry, &expr, &expr_len, &context, dom_node_class_entry, &register_node_ns) == FAILURE) {
362		return;
363	}
364
365	intern = Z_XPATHOBJ_P(id);
366
367	ctxp = (xmlXPathContextPtr) intern->dom.ptr;
368	if (ctxp == NULL) {
369		php_error_docref(NULL, E_WARNING, "Invalid XPath Context");
370		RETURN_FALSE;
371	}
372
373	docp = (xmlDocPtr) ctxp->doc;
374	if (docp == NULL) {
375		php_error_docref(NULL, E_WARNING, "Invalid XPath Document Pointer");
376		RETURN_FALSE;
377	}
378
379	if (context != NULL) {
380		DOM_GET_OBJ(nodep, context, xmlNodePtr, nodeobj);
381	}
382
383	if (!nodep) {
384		nodep = xmlDocGetRootElement(docp);
385	}
386
387	if (nodep && docp != nodep->doc) {
388		php_error_docref(NULL, E_WARNING, "Node From Wrong Document");
389		RETURN_FALSE;
390	}
391
392	ctxp->node = nodep;
393
394	if (register_node_ns) {
395		/* Register namespaces in the node */
396		ns = xmlGetNsList(docp, nodep);
397
398		if (ns != NULL) {
399			while (ns[nsnbr] != NULL)
400			nsnbr++;
401		}
402	}
403
404
405    ctxp->namespaces = ns;
406    ctxp->nsNr = nsnbr;
407
408	xpathobjp = xmlXPathEvalExpression((xmlChar *) expr, ctxp);
409	ctxp->node = NULL;
410
411	if (ns != NULL) {
412		xmlFree(ns);
413		ctxp->namespaces = NULL;
414		ctxp->nsNr = 0;
415	}
416
417	if (! xpathobjp) {
418		RETURN_FALSE;
419	}
420
421	if (type == PHP_DOM_XPATH_QUERY) {
422		xpath_type = XPATH_NODESET;
423	} else {
424		xpath_type = xpathobjp->type;
425	}
426
427	switch (xpath_type) {
428
429		case  XPATH_NODESET:
430		{
431			int i;
432			xmlNodeSetPtr nodesetp;
433
434			array_init(&retval);
435
436			if (xpathobjp->type == XPATH_NODESET && NULL != (nodesetp = xpathobjp->nodesetval)) {
437
438				for (i = 0; i < nodesetp->nodeNr; i++) {
439					xmlNodePtr node = nodesetp->nodeTab[i];
440					zval child;
441
442					if (node->type == XML_NAMESPACE_DECL) {
443						xmlNsPtr curns;
444						xmlNodePtr nsparent;
445
446						nsparent = node->_private;
447						curns = xmlNewNs(NULL, node->name, NULL);
448						if (node->children) {
449							curns->prefix = xmlStrdup((xmlChar *) node->children);
450						}
451						if (node->children) {
452							node = xmlNewDocNode(docp, NULL, (xmlChar *) node->children, node->name);
453						} else {
454							node = xmlNewDocNode(docp, NULL, (xmlChar *) "xmlns", node->name);
455						}
456						node->type = XML_NAMESPACE_DECL;
457						node->parent = nsparent;
458						node->ns = curns;
459					}
460					php_dom_create_object(node, &child, &intern->dom);
461					add_next_index_zval(&retval, &child);
462				}
463			}
464			php_dom_create_interator(return_value, DOM_NODELIST);
465			nodeobj = Z_DOMOBJ_P(return_value);
466			dom_xpath_iter(&retval, nodeobj);
467			break;
468		}
469
470		case XPATH_BOOLEAN:
471			RETVAL_BOOL(xpathobjp->boolval);
472			break;
473
474		case XPATH_NUMBER:
475			RETVAL_DOUBLE(xpathobjp->floatval);
476			break;
477
478		case XPATH_STRING:
479			RETVAL_STRING((char *) xpathobjp->stringval);
480			break;
481
482		default:
483			RETVAL_NULL();
484			break;
485	}
486
487	xmlXPathFreeObject(xpathobjp);
488}
489/* }}} */
490
491/* {{{ proto DOMNodeList dom_xpath_query(string expr [,DOMNode context [, boolean registerNodeNS]]) */
492PHP_FUNCTION(dom_xpath_query)
493{
494	php_xpath_eval(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_DOM_XPATH_QUERY);
495}
496/* }}} end dom_xpath_query */
497
498/* {{{ proto mixed dom_xpath_evaluate(string expr [,DOMNode context [, boolean registerNodeNS]]) */
499PHP_FUNCTION(dom_xpath_evaluate)
500{
501	php_xpath_eval(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_DOM_XPATH_EVALUATE);
502}
503/* }}} end dom_xpath_evaluate */
504
505/* {{{ proto void dom_xpath_register_php_functions() */
506PHP_FUNCTION(dom_xpath_register_php_functions)
507{
508	zval *id;
509	dom_xpath_object *intern;
510	zval *array_value, *entry, new_string;
511	zend_string *name;
512
513	DOM_GET_THIS(id);
514
515	if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS(), "a",  &array_value) == SUCCESS) {
516		intern = Z_XPATHOBJ_P(id);
517		ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(array_value), entry) {
518			zend_string *str = zval_get_string(entry);
519			ZVAL_LONG(&new_string,1);
520			zend_hash_update(intern->registered_phpfunctions, str, &new_string);
521			zend_string_release(str);
522		} ZEND_HASH_FOREACH_END();
523		intern->registerPhpFunctions = 2;
524		RETURN_TRUE;
525
526	} else if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS(), "S",  &name) == SUCCESS) {
527		intern = Z_XPATHOBJ_P(id);
528
529		ZVAL_LONG(&new_string, 1);
530		zend_hash_update(intern->registered_phpfunctions, name, &new_string);
531		intern->registerPhpFunctions = 2;
532	} else {
533		intern = Z_XPATHOBJ_P(id);
534		intern->registerPhpFunctions = 1;
535	}
536
537}
538/* }}} end dom_xpath_register_php_functions */
539
540#endif /* LIBXML_XPATH_ENABLED */
541
542#endif
543
544/*
545 * Local variables:
546 * tab-width: 4
547 * c-basic-offset: 4
548 * End:
549 * vim600: noet sw=4 ts=4 fdm=marker
550 * vim<600: noet sw=4 ts=4
551 */
552