webcit/groupdav_propfind.c

   1 /*
   2  * $Id$
   3  *
   4  * Handles GroupDAV PROPFIND requests.
   5  *
   6  * A few notes about our XML output:
   7  *
   8  * --> Yes, we are spewing tags directly instead of using an XML library.
   9  *     If you would like to rewrite this using libxml2, code it up and submit
  10  *     a patch.  Whining will be summarily ignored.
  11  *
  12  * --> XML is deliberately output with no whitespace/newlines between tags.
  13  *     This makes it difficult to read, but we have discovered clients which
  14  *     crash when you try to pretty it up.
  15  *
  16  */
  17
  18 #include "webcit.h"
  19 #include "webserver.h"
  20 #include "groupdav.h"
  21
  22
  23 /*
  24  * Given an encoded UID, translate that to an unencoded Citadel EUID and
  25  * then search for it in the current room.  Return a message number or -1
  26  * if not found.
  27  *
  28  * NOTE: this function relies on the Citadel server's brute-force search.
  29  * There's got to be a way to optimize this better.
  30  */
  31 long locate_message_by_uid(char *uid) {
  32         char buf[SIZ];
  33         char decoded_uid[SIZ];
  34         long retval = (-1L);
  35
  36         /* Decode the uid */
  37         euid_unescapize(decoded_uid, uid);
  38
  39         serv_puts("MSGS ALL|0|1");
  40         serv_getln(buf, sizeof buf);
  41         if (buf[0] == '8') {
  42                 serv_printf("exti|%s", decoded_uid);
  43                 serv_puts("000");
  44                 while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  45                         retval = atol(buf);
  46                 }
  47         }
  48         return(retval);
  49 }
  50
  51
  52 /*
  53  * List folders containing interesting groupware objects
  54  */
  55 void groupdav_folder_list(void) {
  56         char buf[SIZ];
  57         char roomname[SIZ];
  58         int view;
  59         char datestring[SIZ];
  60         time_t now;
  61
  62         now = time(NULL);
  63         http_datestring(datestring, sizeof datestring, now);
  64
  65         /*
  66          * Be rude.  Completely ignore the XML request and simply send them
  67          * everything we know about.  Let the client sort it out.
  68          */
  69         wprintf("HTTP/1.0 207 Multi-Status\r\n");
  70         groupdav_common_headers();
  71         wprintf("Date: %s\r\n", datestring);
  72         wprintf("Content-type: text/xml\r\n");
  73         wprintf("Content-encoding: identity\r\n");
  74
  75         begin_burst();
  76
  77         wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  78                 "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
  79         );
  80
  81         serv_puts("LKRA");
  82         serv_getln(buf, sizeof buf);
  83         if (buf[0] == '1') while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  84
  85                 extract_token(roomname, buf, 0, '|', sizeof roomname);
  86                 view = extract_int(buf, 6);
  87
  88                 /*
  89                  * For now, only list rooms that we know a GroupDAV client
  90                  * might be interested in.  In the future we may add
  91                  * the rest.
  92                  */
  93                 if ((view == VIEW_CALENDAR)
  94                    || (view == VIEW_TASKS)
  95                    || (view == VIEW_ADDRESSBOOK) ) {
  96
  97                         wprintf("<D:response>");
  98
  99                         wprintf("<D:href>");
 100                         groupdav_identify_host();
 101                         wprintf("/groupdav/");
 102                         urlescputs(roomname);
 103                         wprintf("/</D:href>");
 104
 105                         wprintf("<D:propstat>");
 106                         wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 107                         wprintf("<D:prop>");
 108                         wprintf("<D:displayname>");
 109                         escputs(roomname);
 110                         wprintf("</D:displayname>");
 111                         wprintf("<D:resourcetype><D:collection/>");
 112
 113                         switch(view) {
 114                                 case VIEW_CALENDAR:
 115                                         wprintf("<G:vevent-collection />");
 116                                         break;
 117                                 case VIEW_TASKS:
 118                                         wprintf("<G:vtodo-collection />");
 119                                         break;
 120                                 case VIEW_ADDRESSBOOK:
 121                                         wprintf("<G:vcard-collection />");
 122                                         break;
 123                         }
 124
 125                         wprintf("</D:resourcetype>");
 126                         wprintf("</D:prop>");
 127                         wprintf("</D:propstat>");
 128                         wprintf("</D:response>");
 129                 }
 130         }
 131         wprintf("</D:multistatus>\n");
 132
 133         end_burst();
 134 }
 135
 136
 137
 138 /*
 139  * The pathname is always going to be /groupdav/room_name/msg_num
 140  */
 141 void groupdav_propfind(char *dav_pathname, char *dav_depth, char *dav_content_type, char *dav_content) {
 142         char dav_roomname[256];
 143         char dav_uid[256];
 144         char msgnum[256];
 145         long dav_msgnum = (-1);
 146         char buf[256];
 147         char uid[256];
 148         char encoded_uid[256];
 149         long *msgs = NULL;
 150         int num_msgs = 0;
 151         int i;
 152         char datestring[256];
 153         time_t now;
 154
 155         now = time(NULL);
 156         http_datestring(datestring, sizeof datestring, now);
 157
 158         extract_token(dav_roomname, dav_pathname, 2, '/', sizeof dav_roomname);
 159         extract_token(dav_uid, dav_pathname, 3, '/', sizeof dav_uid);
 160
 161         lprintf(9, "dav_pathname: %s\n", dav_pathname);
 162         lprintf(9, "dav_roomname: %s\n", dav_roomname);
 163         lprintf(9, "     dav_uid: %s\n", dav_uid);
 164         lprintf(9, "   dav_depth: %s\n", dav_depth);
 165
 166         /*
 167          * If the room name is blank, the client is requesting a
 168          * folder list.
 169          */
 170         if (strlen(dav_roomname) == 0) {
 171                 groupdav_folder_list();
 172                 return;
 173         }
 174
 175         /* Go to the correct room. */
 176         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 177                 gotoroom(dav_roomname);
 178         }
 179         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 180                 wprintf("HTTP/1.1 404 not found\r\n");
 181                 groupdav_common_headers();
 182                 wprintf("Date: %s\r\n", datestring);
 183                 wprintf(
 184                         "Content-Type: text/plain\r\n"
 185                         "\r\n"
 186                         "There is no folder called \"%s\" on this server.\r\n",
 187                         dav_roomname
 188                 );
 189                 return;
 190         }
 191
 192         /* If dav_uid is non-empty, client is requesting a PROPFIND on
 193          * a specific item in the room.  This is not valid GroupDAV, but
 194          * we try to honor it anyway because some clients are expecting
 195          * it to work...
 196          */
 197         if (strlen(dav_uid) > 0) {
 198
 199                 dav_msgnum = locate_message_by_uid(dav_uid);
 200                 if (dav_msgnum < 0) {
 201                         wprintf("HTTP/1.1 404 not found\r\n");
 202                         groupdav_common_headers();
 203                         wprintf(
 204                                 "Content-Type: text/plain\r\n"
 205                                 "\r\n"
 206                                 "Object \"%s\" was not found in the \"%s\" folder.\r\n",
 207                                 dav_uid,
 208                                 dav_roomname
 209                         );
 210                         return;
 211                 }
 212
 213                 /* Be rude.  Completely ignore the XML request and simply send them
 214                  * everything we know about (which is going to simply be the ETag and
 215                  * nothing else).  Let the client-side parser sort it out.
 216                  */
 217                 wprintf("HTTP/1.0 207 Multi-Status\r\n");
 218                 groupdav_common_headers();
 219                 wprintf("Date: %s\r\n", datestring);
 220                 wprintf("Content-type: text/xml\r\n");
 221                 wprintf("Content-encoding: identity\r\n");
 222
 223                 begin_burst();
 224
 225                 wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 226                         "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 227                 );
 228
 229                 wprintf("<D:response>");
 230
 231                 wprintf("<D:href>");
 232                 groupdav_identify_host();
 233                 wprintf("/groupdav/");
 234                 urlescputs(WC->wc_roomname);
 235                 euid_escapize(encoded_uid, dav_uid);
 236                 wprintf("/%s", encoded_uid);
 237                 wprintf("</D:href>");
 238                 wprintf("<D:propstat>");
 239                 wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 240                 wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", dav_msgnum);
 241                 wprintf("</D:propstat>");
 242
 243                 wprintf("</D:response>\n");
 244                 wprintf("</D:multistatus>\n");
 245                 end_burst();
 246                 return;
 247         }
 248
 249
 250         /*
 251          * We got to this point, which means that the client is requesting
 252          * a 'collection' (i.e. a list of all items in the room).
 253          *
 254          * Be rude.  Completely ignore the XML request and simply send them
 255          * everything we know about (which is going to simply be the ETag and
 256          * nothing else).  Let the client-side parser sort it out.
 257          */
 258         wprintf("HTTP/1.0 207 Multi-Status\r\n");
 259         groupdav_common_headers();
 260         wprintf("Date: %s\r\n", datestring);
 261         wprintf("Content-type: text/xml\r\n");
 262         wprintf("Content-encoding: identity\r\n");
 263
 264         begin_burst();
 265
 266         wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 267                 "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 268         );
 269
 270         serv_puts("MSGS ALL");
 271         serv_getln(buf, sizeof buf);
 272         if (buf[0] == '1') while (serv_getln(msgnum, sizeof msgnum), strcmp(msgnum, "000")) {
 273                 msgs = realloc(msgs, ++num_msgs * sizeof(long));
 274                 msgs[num_msgs-1] = atol(msgnum);
 275         }
 276
 277         if (num_msgs > 0) for (i=0; i<num_msgs; ++i) {
 278
 279                 strcpy(uid, "");
 280                 serv_printf("MSG0 %ld|3", msgs[i]);
 281                 serv_getln(buf, sizeof buf);
 282                 if (buf[0] == '1') while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 283                         if (!strncasecmp(buf, "exti=", 5)) {
 284                                 strcpy(uid, &buf[5]);
 285                         }
 286                 }
 287
 288                 if (strlen(uid) > 0) {
 289                         wprintf("<D:response>");
 290                         wprintf("<D:href>");
 291                         groupdav_identify_host();
 292                         wprintf("/groupdav/");
 293                         urlescputs(WC->wc_roomname);
 294                         euid_escapize(encoded_uid, uid);
 295                         wprintf("/%s", encoded_uid);
 296                         wprintf("</D:href>");
 297                         wprintf("<D:propstat>");
 298                         wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 299                         wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", msgs[i]);
 300                         wprintf("</D:propstat>");
 301                         wprintf("</D:response>");
 302                 }
 303         }
 304
 305         wprintf("</D:multistatus>\n");
 306         end_burst();
 307
 308         if (msgs != NULL) {
 309                 free(msgs);
 310         }
 311 }