Annotation of parser3/src/main/pa_xml_io.C, revision 1.27
1.1 paf 1: /** @file
2: Parser: plugins to xml library, controlling i/o; implementation
3:
1.24 misha 4: Copyright (c) 2001-2009 ArtLebedev Group (http://www.artlebedev.com)
1.1 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
6: */
7:
8: #include "pa_xml_io.h"
9:
10: #ifdef XML
11:
1.27 ! moko 12: static const char * const IDENT="$Date: 2009-09-25 12:58:39 $";
1.1 paf 13:
14: #include "libxslt/extensions.h"
15:
1.17 paf 16: #include "pa_threads.h"
1.1 paf 17: #include "pa_globals.h"
18: #include "pa_request.h"
19:
1.27 ! moko 20: THREAD_LOCAL HashStringBool* xml_dependencies = NULL;
1.17 paf 21:
22: static void add_dependency(const String::Body url) {
1.27 ! moko 23: if(xml_dependencies) // do we need to monitor now?
! 24: xml_dependencies->put(url, true);
1.17 paf 25: }
26:
27: void pa_xmlStartMonitoringDependencies() {
1.27 ! moko 28: xml_dependencies=new HashStringBool;
1.17 paf 29: }
30:
31: void pa_xmlStopMonitoringDependencies() {
1.27 ! moko 32: xml_dependencies=NULL;
1.17 paf 33: }
34:
35: HashStringBool* pa_xmlGetDependencies() {
1.27 ! moko 36: HashStringBool* result=xml_dependencies;
! 37: xml_dependencies=NULL;
! 38: return result;
1.17 paf 39: }
40:
1.8 paf 41: #ifndef DOXYGEN
42: struct MemoryStream {
43: const char* m_buf;
44: size_t m_size;
45: size_t m_position;
46:
47: int read(char* a_buffer, size_t a_size) {
48: size_t left=m_size-m_position;
49: if(!left)
50: return 0;
51:
52: size_t to_read=min(a_size, left);
1.14 paf 53: memcpy(a_buffer, m_buf+m_position, to_read);
1.8 paf 54: m_position+=to_read;
55: return to_read;
56: }
57:
58: };
59: #endif
60:
1.15 paf 61: static void *
1.17 paf 62: xmlFileOpen_ReadIntoStream (const char* do_not_store_filename, bool adjust_path_to_root_from_document_root=false) {
1.18 paf 63: #ifdef PA_SAFE_MODE
64: //copied from libxml/catalog.c
65: # define XML_XML_DEFAULT_CATALOG "file:///etc/xml/catalog"
66: // disable attempts to consult default catalog [usually, that file belongs to other user/group]
67: if(strcmp(do_not_store_filename, XML_XML_DEFAULT_CATALOG)==0)
68: return 0;
69: #endif
70:
1.15 paf 71: Request& r=pa_thread_request();
72: char adjust_buf[MAX_STRING];
73: if(adjust_path_to_root_from_document_root) {
74: const char* document_root=r.request_info.document_root;
75: if(!document_root)
76: document_root=".";
77:
78: adjust_buf[0]=0;
79: strcat(adjust_buf, document_root);
1.17 paf 80: strcat(adjust_buf, &do_not_store_filename[16]);
81: do_not_store_filename=adjust_buf;
1.15 paf 82: } else
1.20 misha 83: if(!strstr(do_not_store_filename, "http://"))
1.26 misha 84: if(strstr(do_not_store_filename, "file://")){
85: do_not_store_filename+=7/*strlen("file://")*/;
86: #ifdef WIN32
87: if(
88: do_not_store_filename[0]=='/'
89: && do_not_store_filename[1]
90: && do_not_store_filename[2]==':'
91: && do_not_store_filename[3]=='/'
92: ){
93: // skip leading slash for absolute path file:///C:/path/to/file
94: do_not_store_filename++;
95: }
96: #endif
97: } else if(*do_not_store_filename && do_not_store_filename[1]!=':' && strstr(do_not_store_filename, "://")) {
1.20 misha 98: pa_xmlStopMonitoringDependencies();
99: return 0; // plug out [do not handle other prefixes]
100: }
1.17 paf 101:
102: const char* can_store_filename=pa_strdup(do_not_store_filename);
103: add_dependency(can_store_filename);
1.15 paf 104:
105: const char *buf;
106: try {
1.23 misha 107: buf=file_load_text(r, *new String(can_store_filename),
1.22 misha 108: true/*fail_on_read_problem*/,
109: 0/*params*/,
110: false/*don't transcode result because it must be fit with @encoding value!*/);
1.15 paf 111: } catch(const Exception& e) {
1.17 paf 112: if(strcmp(e.type(), "file.missing")==0)
113: return 0; // let the library try that and report an error properly
114:
1.15 paf 115: buf=e.comment();
116: } catch(...) {
1.17 paf 117: buf="xmlFileOpen_ReadIntoStream: unknown error";
1.15 paf 118: }
119: MemoryStream* stream=new(UseGC) MemoryStream;
120: stream->m_buf=buf;
121: stream->m_size=strlen(buf);
122: return (void *)stream;
123: }
1.9 paf 124:
125: static int
1.17 paf 126: xmlFileMatchMonitor(const char* /*file_spec_cstr*/) {
127: return 1; // always intercept, causing xmlFileOpenMonitor to be called
1.15 paf 128: }
129: static void *
1.17 paf 130: xmlFileOpenMonitor(const char* filename) {
1.15 paf 131: return xmlFileOpen_ReadIntoStream(filename); // handles localfile case, else returns 0
1.9 paf 132: }
133:
134:
1.1 paf 135: /**
136: * xmlFileMatchWithLocalhostEqDocumentRoot:
137: * filename: the URI for matching
138: *
139: * check if the URI matches an HTTP one
140: *
141: * Returns 1 if matches, 0 otherwise
142: */
143: static int
144: xmlFileMatchLocalhost(const char* filename) {
145: if (!strncmp(filename, "http://localhost", 16))
146: return(1);
147: return(0);
148: }
149:
150: /**
1.15 paf 151: * xmlFileOpenLocalhost:
1.1 paf 152: * filename: the URI for matching
153: *
154: * http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
155: *
156: * Returns an I/O context or NULL in case of error
157: */
158: static void *
159: xmlFileOpenLocalhost (const char* filename) {
1.15 paf 160: return xmlFileOpen_ReadIntoStream(filename, true/*adjust path to root from document_root*/);
1.1 paf 161: }
162:
1.2 paf 163: static int
164: xmlFileMatchMethod(const char* filename) {
1.3 paf 165: if (!strncmp(filename, "parser://", 9 /*strlen("parser://"), and check xmlFileOpenMethod*/))
1.2 paf 166: return(1);
167: return(0);
168: }
169:
1.5 paf 170: /// parser://method/param/here -> ^MAIN:method[/params/here]
1.2 paf 171: static void *
172: xmlFileOpenMethod (const char* afilename) {
1.15 paf 173: const char* buf;
174: try {
175: Request& r=pa_thread_request();
176:
177: char* s=pa_strdup(afilename+9 /*strlen("parser://")*/);
178: const char* method_cstr=lsplit(&s, '/');
179: const String* method=new String(method_cstr);
180: String::Body param_body("/");
181: if(s)
182: param_body.append_know_length(s, strlen(s));
183:
184: VString* vparam=new VString(*new String(param_body, String::L_TAINTED));
185: {
186: Temp_lang temp_lang(r, String::L_XML); // default language: XML
187: Request::Execute_nonvirtual_method_result body=
188: r.execute_nonvirtual_method(r.main_class, *method, vparam, true);
189: if(body.string) {
1.25 misha 190: buf=body.string->untaint_cstr(r.flang);
1.15 paf 191: } else
192: throw Exception(0,
193: new String(afilename),
194: "'%s' method not found in %s class",
195: method_cstr, MAIN_CLASS_NAME);
1.2 paf 196: }
1.15 paf 197: } catch(const Exception& e) {
198: buf=e.comment();
199: } catch(...) {
200: buf="xmlFileOpenLocalhost: unknown error";
1.2 paf 201: }
1.15 paf 202: MemoryStream* stream=new(UseGC) MemoryStream;
203: stream->m_buf=buf;
204: stream->m_size=strlen(buf);
205: return (void *)stream;
1.2 paf 206: }
207:
1.15 paf 208: /**
209: * pa_xmlFileReadMethod:
210: * @context: the I/O context
211: * @buffer: where to drop data
212: * @len: number of bytes to write
213: *
214: * Read @len bytes to @buffer from the I/O channel.
215: *
216: * Returns the number of bytes written
217: */
1.2 paf 218: static int
219: pa_xmlFileReadMethod (void * context, //< MemoryStream actually
220: char * buffer, int len)
221: {
222: MemoryStream& stream=*static_cast<MemoryStream*>(context);
223:
224: return stream.read(buffer, len);
225: }
226:
227: static int
228: pa_xmlFileCloseMethod (void * /*context*/) {
229: return 0;
230: }
231:
232:
1.1 paf 233:
234: void pa_xml_io_init() {
1.17 paf 235: // file open monitorer [for xslt cacher]
1.9 paf 236: // safe mode checker, always fail match, but checks non-"://" there
237: xmlRegisterInputCallbacks(
1.17 paf 238: xmlFileMatchMonitor, xmlFileOpenMonitor,
1.15 paf 239: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.17 paf 240:
1.1 paf 241: // http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
242: xmlRegisterInputCallbacks(
243: xmlFileMatchLocalhost, xmlFileOpenLocalhost,
1.8 paf 244: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.2 paf 245:
1.5 paf 246: // parser://method/param/here -> ^MAIN:method[/params/here]
1.2 paf 247: xmlRegisterInputCallbacks(
248: xmlFileMatchMethod, xmlFileOpenMethod,
249: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.1 paf 250: }
251:
252: #endif
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