webcit/dav_main.c

   1 /*
   2  * Entry point for GroupDAV functions
   3  *
   4  * Copyright (c) 2005-2012 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 3.
   8  *
   9  *
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  *
  17  *
  18  *
  19  */
  20
  21 #include "webcit.h"
  22 #include "webserver.h"
  23 #include "dav.h"
  24
  25 extern HashList *HandlerHash;
  26
  27 HashList *DavNamespaces = NULL;
  28
  29 /*
  30  * Output HTTP headers which are common to all requests.
  31  *
  32  * Please observe that we don't use the usual output_headers()
  33  * and wDumpContent() functions in the GroupDAV subsystem, so we
  34  * do our own header stuff here.
  35  *
  36  */
  37 void dav_common_headers(void) {
  38         hprintf(
  39                 "Server: %s / %s\r\n"
  40                 "Connection: close\r\n",
  41                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
  42         );
  43 }
  44
  45
  46
  47 /*
  48  * string conversion function
  49  */
  50 void euid_escapize(char *target, const char *source) {
  51         int i, len;
  52         int target_length = 0;
  53
  54         strcpy(target, "");
  55         len = strlen(source);
  56         for (i=0; i<len; ++i) {
  57                 if ( (isalnum(source[i])) || (source[i]=='-') || (source[i]=='_') ) {
  58                         target[target_length] = source[i];
  59                         target[++target_length] = 0;
  60                 }
  61                 else {
  62                         sprintf(&target[target_length], "=%02X", (0xFF & source[i]));
  63                         target_length += 3;
  64                 }
  65         }
  66 }
  67
  68 /*
  69  * string conversion function
  70  */
  71 void euid_unescapize(char *target, const char *source) {
  72         int a, b, len;
  73         char hex[3];
  74         int target_length = 0;
  75
  76         strcpy(target, "");
  77
  78         len = strlen(source);
  79         for (a = 0; a < len; ++a) {
  80                 if (source[a] == '=') {
  81                         hex[0] = source[a + 1];
  82                         hex[1] = source[a + 2];
  83                         hex[2] = 0;
  84                         b = 0;
  85                         b = decode_hex(hex);
  86                         target[target_length] = b;
  87                         target[++target_length] = 0;
  88                         a += 2;
  89                 }
  90                 else {
  91                         target[target_length] = source[a];
  92                         target[++target_length] = 0;
  93                 }
  94         }
  95 }
  96
  97
  98
  99
 100 /*
 101  * Main entry point for GroupDAV requests
 102  */
 103 void dav_main(void)
 104 {
 105         wcsession *WCC = WC;
 106         int i, len;
 107
 108         syslog(LOG_DEBUG, "dav_main() called, logged_in=%d", WCC->logged_in );
 109
 110         StrBufUnescape(WCC->Hdr->HR.ReqLine, 0);
 111         StrBufStripSlashes(WCC->Hdr->HR.ReqLine, 0);
 112
 113         /*
 114          * If there's an If-Match: header, strip out the quotes if present, and
 115          * then if all that's left is an asterisk, make it go away entirely.
 116          */
 117         len = StrLength(WCC->Hdr->HR.dav_ifmatch);
 118         if (len > 0) {
 119                 StrBufTrim(WCC->Hdr->HR.dav_ifmatch);
 120                 if (ChrPtr(WCC->Hdr->HR.dav_ifmatch)[0] == '\"') {
 121                         StrBufCutLeft(WCC->Hdr->HR.dav_ifmatch, 1);
 122                         len --;
 123                         for (i=0; i<len; ++i) {
 124                                 if (ChrPtr(WCC->Hdr->HR.dav_ifmatch)[i] == '\"') {
 125                                         StrBufCutAt(WCC->Hdr->HR.dav_ifmatch, i, NULL);
 126                                         len = StrLength(WCC->Hdr->HR.dav_ifmatch);
 127                                 }
 128                         }
 129                 }
 130                 if (!strcmp(ChrPtr(WCC->Hdr->HR.dav_ifmatch), "*")) {
 131                         FlushStrBuf(WCC->Hdr->HR.dav_ifmatch);
 132                 }
 133         }
 134
 135         switch (WCC->Hdr->HR.eReqType)
 136         {
 137         /*
 138          * The OPTIONS method is not required by GroupDAV but it will be
 139          * needed for future implementations of other DAV-based protocols.
 140          */
 141         case eOPTIONS:
 142                 dav_options();
 143                 break;
 144
 145         /*
 146          * The PROPFIND method is basically used to list all objects in a
 147          * room, or to list all relevant rooms on the server.
 148          */
 149         case ePROPFIND:
 150                 dav_propfind();
 151                 break;
 152
 153         /*
 154          * The GET method is used for fetching individual items.
 155          */
 156         case eGET:
 157                 dav_get();
 158                 break;
 159
 160         /*
 161          * The PUT method is used to add or modify items.
 162          */
 163         case ePUT:
 164                 dav_put();
 165                 break;
 166
 167         /*
 168          * The DELETE method kills, maims, and destroys.
 169          */
 170         case eDELETE:
 171                 dav_delete();
 172                 break;
 173
 174         /*
 175          * The REPORT method tells us that Mike Shaver is a self-righteous asshole.
 176          */
 177         case eREPORT:
 178                 dav_report();
 179                 break;
 180
 181         default:
 182         /*
 183          * Couldn't find what we were looking for.  Die in a car fire.
 184          */
 185                 hprintf("HTTP/1.1 501 Method not implemented\r\n");
 186                 dav_common_headers();
 187                 hprintf("Content-Type: text/plain\r\n");
 188                 wc_printf("GroupDAV method \"%s\" is not implemented.\r\n",
 189                         ReqStrs[WCC->Hdr->HR.eReqType]);
 190                 end_burst();
 191         }
 192 }
 193
 194
 195 /*
 196  * Output our host prefix for globally absolute URL's.
 197  */
 198 void dav_identify_host(void) {
 199         wc_printf("%s", ChrPtr(site_prefix));
 200 }
 201
 202
 203 void tmplput_dav_HOSTNAME(StrBuf *Target, WCTemplputParams *TP)
 204 {
 205         StrBufAppendPrintf(Target, "%s", ChrPtr(site_prefix));
 206 }
 207
 208 /*
 209  * Output our host prefix for globally absolute URL's.
 210  */
 211 void dav_identify_hosthdr(void) {
 212         hprintf("%s", ChrPtr(site_prefix));
 213 }
 214
 215
 216 void Header_HandleIfMatch(StrBuf *Line, ParsedHttpHdrs *hdr)
 217 {
 218         hdr->HR.dav_ifmatch = Line;
 219 }
 220
 221
 222 void Header_HandleDepth(StrBuf *Line, ParsedHttpHdrs *hdr)
 223 {
 224         if (!strcasecmp(ChrPtr(Line), "infinity")) {
 225                 hdr->HR.dav_depth = 32767;
 226         }
 227         else if (strcmp(ChrPtr(Line), "0") == 0) {
 228                 hdr->HR.dav_depth = 0;
 229         }
 230         else if (strcmp(ChrPtr(Line), "1") == 0) {
 231                 hdr->HR.dav_depth = 1;
 232         }
 233 }
 234
 235
 236 int Conditional_DAV_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 237 {
 238         return WC->Hdr->HR.dav_depth == GetTemplateTokenNumber(Target, TP, 2, 0);
 239 }
 240
 241
 242 void RegisterDAVNamespace(const char * UrlString,
 243                           long UrlSLen,
 244                           const char *DisplayName,
 245                           long dslen,
 246                           WebcitHandlerFunc F,
 247                           WebcitRESTDispatchID RID,
 248                           long Flags)
 249 {
 250         void *vHandler;
 251
 252         /* first put it in... */
 253         WebcitAddUrlHandler(UrlString, UrlSLen, DisplayName, dslen, F, Flags|PARSE_REST_URL);
 254         /* get it out again... */
 255         GetHash(HandlerHash, UrlString, UrlSLen, &vHandler);
 256         ((WebcitHandler*)vHandler)->RID = RID;
 257         /* and keep a copy of it, so we can compare it later */
 258         Put(DavNamespaces, UrlString, UrlSLen, vHandler, reference_free_handler);
 259 }
 260
 261
 262 int Conditional_DAV_NS(StrBuf *Target, WCTemplputParams *TP)
 263 {
 264         wcsession *WCC = WC;
 265         void *vHandler;
 266         const char *NS;
 267         long NSLen;
 268
 269         GetTemplateTokenString(NULL, TP, 2, &NS, &NSLen);
 270         GetHash(HandlerHash, NS, NSLen, &vHandler);
 271         return WCC->Hdr->HR.Handler == vHandler;
 272 }
 273
 274
 275 int Conditional_DAV_NSCURRENT(StrBuf *Target, WCTemplputParams *TP)
 276 {
 277         wcsession *WCC = WC;
 278         void *vHandler;
 279
 280         vHandler = CTX;
 281         return WCC->Hdr->HR.Handler == vHandler;
 282 }
 283
 284
 285 void tmplput_DAV_NAMESPACE(StrBuf *Target, WCTemplputParams *TP)
 286 {
 287         wcsession *WCC = WC;
 288
 289         if (TP->Filter.ContextType == CTX_DAVNS) {
 290                 WebcitHandler *H;
 291                 H = (WebcitHandler*) CTX;
 292                 StrBufAppendTemplate(Target, TP, H->Name, 0);
 293         }
 294         else if (WCC->Hdr->HR.Handler != NULL) {
 295                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->Name, 0);
 296         }
 297 }
 298
 299
 300 int GroupdavDispatchREST(RESTDispatchID WhichAction, int IgnoreFloor)
 301 {
 302         wcsession *WCC = WC;
 303         void *vDir;
 304
 305         switch(WhichAction){
 306         case ExistsID:
 307                 GetHash(WCC->Directory, IKEY(WCC->ThisRoom->nRoomNameParts + 1), &vDir);
 308                 return locate_message_by_uid(ChrPtr((StrBuf*)vDir)) != -1;
 309                 /* TODO: remember euid */
 310         case PutID:
 311         case DeleteID:
 312                 break;
 313
 314
 315         }
 316         return 0;
 317 }
 318
 319
 320 void
 321 ServerStartModule_DAV
 322 (void)
 323 {
 324
 325         DavNamespaces = NewHash(1, NULL);
 326 }
 327
 328
 329 void
 330 ServerShutdownModule_DAV
 331 (void)
 332 {
 333         DeleteHash(&DavNamespaces);
 334 }
 335
 336
 337 void
 338 InitModule_GROUPDAV
 339 (void)
 340 {
 341         RegisterDAVNamespace(HKEY("groupdav"), HKEY("GroupDAV"),
 342                              dav_main, GroupdavDispatchREST,
 343                              XHTTP_COMMANDS|COOKIEUNNEEDED|FORCE_SESSIONCLOSE
 344         );
 345
 346         RegisterNamespace("DAV:HOSTNAME", 0, 0, tmplput_dav_HOSTNAME, NULL, CTX_NONE);
 347
 348         RegisterConditional(HKEY("COND:DAV:NS"), 0, Conditional_DAV_NS,  CTX_NONE);
 349
 350         RegisterIterator("DAV:NS", 0, DavNamespaces, NULL,
 351                          NULL, NULL, CTX_DAVNS, CTX_NONE, IT_NOFLAG
 352         );
 353
 354         RegisterConditional(HKEY("COND:DAV:NSCURRENT"), 0, Conditional_DAV_NSCURRENT,  CTX_DAVNS);
 355         RegisterNamespace("DAV:NAMESPACE", 0, 1, tmplput_DAV_NAMESPACE, NULL, CTX_NONE);
 356
 357         RegisterHeaderHandler(HKEY("IF-MATCH"), Header_HandleIfMatch);
 358         RegisterHeaderHandler(HKEY("DEPTH"), Header_HandleDepth);
 359         RegisterConditional(HKEY("COND:DAV:DEPTH"), 1, Conditional_DAV_DEPTH,  CTX_NONE);
 360 }