Annotation of parser3/src/main/pa_xml_io.C, revision 1.19
1.1 paf 1: /** @file
2: Parser: plugins to xml library, controlling i/o; implementation
3:
1.19 ! paf 4: Copyright (c) 2001-2005 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:
1.19 ! paf 12: static const char * const IDENT="$Date: 2004/04/08 08:46:16 $";
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:
1.17 paf 20: static Hash<pa_thread_t, HashStringBool*> xml_dependencies;
21:
22: static void add_dependency(const String::Body url) {
23: pa_thread_t thread_id=pa_get_thread_id();
24: HashStringBool* urls;
25: {
26: SYNCHRONIZED;
27:
28: // try to get existing for this thread_id
29: urls=xml_dependencies.get(thread_id);
30: }
31:
32: if(urls) // do we need to monitor now?
33: urls->put(url, true);
34: }
35:
36: void pa_xmlStartMonitoringDependencies() {
37: pa_thread_t thread_id=pa_get_thread_id();
38: HashStringBool* urls=new HashStringBool;
39: {
40: SYNCHRONIZED; // find+fill blocked
41:
42: xml_dependencies.put(thread_id, urls);
43: }
44: }
45:
46: void pa_xmlStopMonitoringDependencies() {
47: pa_thread_t thread_id=pa_get_thread_id();
48: {
49: SYNCHRONIZED; // find+fill blocked
50:
51: xml_dependencies.put(thread_id, 0);
52: }
53: }
54:
55: HashStringBool* pa_xmlGetDependencies() {
56: pa_thread_t thread_id=pa_get_thread_id();
57: {
58: SYNCHRONIZED; // find+remove blocked
59:
60: HashStringBool* result=xml_dependencies.get(thread_id);
61: xml_dependencies.remove(thread_id);
62: return result;
63: }
64: }
65:
1.8 paf 66: #ifndef DOXYGEN
67: struct MemoryStream {
68: const char* m_buf;
69: size_t m_size;
70: size_t m_position;
71:
72: int read(char* a_buffer, size_t a_size) {
73: size_t left=m_size-m_position;
74: if(!left)
75: return 0;
76:
77: size_t to_read=min(a_size, left);
1.14 paf 78: memcpy(a_buffer, m_buf+m_position, to_read);
1.8 paf 79: m_position+=to_read;
80: return to_read;
81: }
82:
83: };
84: #endif
85:
1.15 paf 86: static void *
1.17 paf 87: xmlFileOpen_ReadIntoStream (const char* do_not_store_filename, bool adjust_path_to_root_from_document_root=false) {
1.18 paf 88: #ifdef PA_SAFE_MODE
89: //copied from libxml/catalog.c
90: # define XML_XML_DEFAULT_CATALOG "file:///etc/xml/catalog"
91: // disable attempts to consult default catalog [usually, that file belongs to other user/group]
92: if(strcmp(do_not_store_filename, XML_XML_DEFAULT_CATALOG)==0)
93: return 0;
94: #endif
95:
1.15 paf 96: Request& r=pa_thread_request();
97: char adjust_buf[MAX_STRING];
98: if(adjust_path_to_root_from_document_root) {
99: const char* document_root=r.request_info.document_root;
100: if(!document_root)
101: document_root=".";
102:
103: adjust_buf[0]=0;
104: strcat(adjust_buf, document_root);
1.17 paf 105: strcat(adjust_buf, &do_not_store_filename[16]);
106: do_not_store_filename=adjust_buf;
1.15 paf 107: } else
1.17 paf 108: if(strstr(do_not_store_filename, "file://"))
109: do_not_store_filename+=7/*strlen("file://")*/;
110: else if(*do_not_store_filename && do_not_store_filename[1]!=':' && strstr(do_not_store_filename, "://")) {
111: pa_xmlStopMonitoringDependencies();
1.15 paf 112: return 0; // plug out [do not handle other prefixes]
1.17 paf 113: }
114:
115: const char* can_store_filename=pa_strdup(do_not_store_filename);
116: add_dependency(can_store_filename);
1.15 paf 117:
118: const char *buf;
119: try {
1.17 paf 120: buf=file_read_text(r.charsets, *new String(can_store_filename));
1.15 paf 121: } catch(const Exception& e) {
1.17 paf 122: if(strcmp(e.type(), "file.missing")==0)
123: return 0; // let the library try that and report an error properly
124:
1.15 paf 125: buf=e.comment();
126: } catch(...) {
1.17 paf 127: buf="xmlFileOpen_ReadIntoStream: unknown error";
1.15 paf 128: }
129: MemoryStream* stream=new(UseGC) MemoryStream;
130: stream->m_buf=buf;
131: stream->m_size=strlen(buf);
132: return (void *)stream;
133: }
1.9 paf 134:
135: static int
1.17 paf 136: xmlFileMatchMonitor(const char* /*file_spec_cstr*/) {
137: return 1; // always intercept, causing xmlFileOpenMonitor to be called
1.15 paf 138: }
139: static void *
1.17 paf 140: xmlFileOpenMonitor(const char* filename) {
1.15 paf 141: return xmlFileOpen_ReadIntoStream(filename); // handles localfile case, else returns 0
1.9 paf 142: }
143:
144:
1.1 paf 145: /**
146: * xmlFileMatchWithLocalhostEqDocumentRoot:
147: * filename: the URI for matching
148: *
149: * check if the URI matches an HTTP one
150: *
151: * Returns 1 if matches, 0 otherwise
152: */
153: static int
154: xmlFileMatchLocalhost(const char* filename) {
155: if (!strncmp(filename, "http://localhost", 16))
156: return(1);
157: return(0);
158: }
159:
160: /**
1.15 paf 161: * xmlFileOpenLocalhost:
1.1 paf 162: * filename: the URI for matching
163: *
164: * http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
165: *
166: * Returns an I/O context or NULL in case of error
167: */
168: static void *
169: xmlFileOpenLocalhost (const char* filename) {
1.15 paf 170: return xmlFileOpen_ReadIntoStream(filename, true/*adjust path to root from document_root*/);
1.1 paf 171: }
172:
1.2 paf 173: static int
174: xmlFileMatchMethod(const char* filename) {
1.3 paf 175: if (!strncmp(filename, "parser://", 9 /*strlen("parser://"), and check xmlFileOpenMethod*/))
1.2 paf 176: return(1);
177: return(0);
178: }
179:
1.5 paf 180: /// parser://method/param/here -> ^MAIN:method[/params/here]
1.2 paf 181: static void *
182: xmlFileOpenMethod (const char* afilename) {
1.15 paf 183: const char* buf;
184: try {
185: Request& r=pa_thread_request();
186:
187: char* s=pa_strdup(afilename+9 /*strlen("parser://")*/);
188: const char* method_cstr=lsplit(&s, '/');
189: const String* method=new String(method_cstr);
190: String::Body param_body("/");
191: if(s)
192: param_body.append_know_length(s, strlen(s));
193:
194: VString* vparam=new VString(*new String(param_body, String::L_TAINTED));
195: {
196: Temp_lang temp_lang(r, String::L_XML); // default language: XML
197: Request::Execute_nonvirtual_method_result body=
198: r.execute_nonvirtual_method(r.main_class, *method, vparam, true);
199: if(body.string) {
200: buf=body.string->cstr(String::L_UNSPECIFIED);
201: } else
202: throw Exception(0,
203: new String(afilename),
204: "'%s' method not found in %s class",
205: method_cstr, MAIN_CLASS_NAME);
1.2 paf 206: }
1.15 paf 207: } catch(const Exception& e) {
208: buf=e.comment();
209: } catch(...) {
210: buf="xmlFileOpenLocalhost: unknown error";
1.2 paf 211: }
1.15 paf 212: MemoryStream* stream=new(UseGC) MemoryStream;
213: stream->m_buf=buf;
214: stream->m_size=strlen(buf);
215: return (void *)stream;
1.2 paf 216: }
217:
1.15 paf 218: /**
219: * pa_xmlFileReadMethod:
220: * @context: the I/O context
221: * @buffer: where to drop data
222: * @len: number of bytes to write
223: *
224: * Read @len bytes to @buffer from the I/O channel.
225: *
226: * Returns the number of bytes written
227: */
1.2 paf 228: static int
229: pa_xmlFileReadMethod (void * context, //< MemoryStream actually
230: char * buffer, int len)
231: {
232: MemoryStream& stream=*static_cast<MemoryStream*>(context);
233:
234: return stream.read(buffer, len);
235: }
236:
237: static int
238: pa_xmlFileCloseMethod (void * /*context*/) {
239: return 0;
240: }
241:
242:
1.1 paf 243:
244: void pa_xml_io_init() {
1.17 paf 245: // file open monitorer [for xslt cacher]
1.9 paf 246: // safe mode checker, always fail match, but checks non-"://" there
247: xmlRegisterInputCallbacks(
1.17 paf 248: xmlFileMatchMonitor, xmlFileOpenMonitor,
1.15 paf 249: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.17 paf 250:
1.1 paf 251: // http://localhost/abc -> $ENV{DOCUMENT_ROOT}/abc | ./abc
252: xmlRegisterInputCallbacks(
253: xmlFileMatchLocalhost, xmlFileOpenLocalhost,
1.8 paf 254: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.2 paf 255:
1.5 paf 256: // parser://method/param/here -> ^MAIN:method[/params/here]
1.2 paf 257: xmlRegisterInputCallbacks(
258: xmlFileMatchMethod, xmlFileOpenMethod,
259: pa_xmlFileReadMethod, pa_xmlFileCloseMethod);
1.1 paf 260: }
261:
262: #endif
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