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_printf("EUID %s", decoded_uid);
  40         serv_getln(buf, sizeof buf);
  41         if (buf[0] == '2') {
  42                 retval = extract_long(&buf[4], 0);
  43         }
  44         return(retval);
  45 }
  46
  47
  48 /*
  49  * List folders containing interesting groupware objects
  50  */
  51 void groupdav_folder_list(void) {
  52         char buf[SIZ];
  53         char roomname[SIZ];
  54         int view;
  55         char datestring[SIZ];
  56         time_t now;
  57
  58         now = time(NULL);
  59         http_datestring(datestring, sizeof datestring, now);
  60
  61         /*
  62          * Be rude.  Completely ignore the XML request and simply send them
  63          * everything we know about.  Let the client sort it out.
  64          */
  65         wprintf("HTTP/1.1 207 Multi-Status\r\n");
  66         groupdav_common_headers();
  67         wprintf("Date: %s\r\n", datestring);
  68         wprintf("Content-type: text/xml\r\n");
  69         wprintf("Content-encoding: identity\r\n");
  70
  71         begin_burst();
  72
  73         wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  74                 "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
  75         );
  76
  77         serv_puts("LKRA");
  78         serv_getln(buf, sizeof buf);
  79         if (buf[0] == '1') while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  80
  81                 extract_token(roomname, buf, 0, '|', sizeof roomname);
  82                 view = extract_int(buf, 6);
  83
  84                 /*
  85                  * For now, only list rooms that we know a GroupDAV client
  86                  * might be interested in.  In the future we may add
  87                  * the rest.
  88                  */
  89                 if ((view == VIEW_CALENDAR)
  90                    || (view == VIEW_TASKS)
  91                    || (view == VIEW_ADDRESSBOOK) ) {
  92
  93                         wprintf("<D:response>");
  94
  95                         wprintf("<D:href>");
  96                         if (strlen(WC->http_host) > 0) {
  97                                 wprintf("%s://%s",
  98                                         (is_https ? "https" : "http"),
  99                                         WC->http_host);
 100                         }
 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) {
 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         /*
 162         lprintf(9, "dav_pathname: %s\n", dav_pathname);
 163         lprintf(9, "dav_roomname: %s\n", dav_roomname);
 164         lprintf(9, "     dav_uid: %s\n", dav_uid);
 165         */
 166
 167         /*
 168          * If the room name is blank, the client is requesting a
 169          * folder list.
 170          */
 171         if (strlen(dav_roomname) == 0) {
 172                 groupdav_folder_list();
 173                 return;
 174         }
 175
 176         /* Go to the correct room. */
 177         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 178                 gotoroom(dav_roomname);
 179         }
 180         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 181                 wprintf("HTTP/1.1 404 not found\r\n");
 182                 groupdav_common_headers();
 183                 wprintf("Date: %s\r\n", datestring);
 184                 wprintf(
 185                         "Content-Type: text/plain\r\n"
 186                         "\r\n"
 187                         "There is no folder called \"%s\" on this server.\r\n",
 188                         dav_roomname
 189                 );
 190                 return;
 191         }
 192
 193         /* If dav_uid is non-empty, client is requesting a PROPFIND on
 194          * a specific item in the room.  This is not valid GroupDAV, but
 195          * we try to honor it anyway because some clients are expecting
 196          * it to work...
 197          */
 198         if (strlen(dav_uid) > 0) {
 199
 200                 dav_msgnum = locate_message_by_uid(dav_uid);
 201                 if (dav_msgnum < 0) {
 202                         wprintf("HTTP/1.1 404 not found\r\n");
 203                         groupdav_common_headers();
 204                         wprintf(
 205                                 "Content-Type: text/plain\r\n"
 206                                 "\r\n"
 207                                 "Object \"%s\" was not found in the \"%s\" folder.\r\n",
 208                                 dav_uid,
 209                                 dav_roomname
 210                         );
 211                         return;
 212                 }
 213
 214                 /* Be rude.  Completely ignore the XML request and simply send them
 215                  * everything we know about (which is going to simply be the ETag and
 216                  * nothing else).  Let the client-side parser sort it out.
 217                  */
 218                 wprintf("HTTP/1.1 207 Multi-Status\r\n");
 219                 groupdav_common_headers();
 220                 wprintf("Date: %s\r\n", datestring);
 221                 wprintf("Content-type: text/xml\r\n");
 222                 wprintf("Content-encoding: identity\r\n");
 223
 224                 begin_burst();
 225
 226                 wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 227                         "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 228                 );
 229
 230                 wprintf("<D:response>");
 231
 232                 wprintf("<D:href>");
 233                 if (strlen(WC->http_host) > 0) {
 234                         wprintf("%s://%s",
 235                                 (is_https ? "https" : "http"),
 236                                 WC->http_host);
 237                 }
 238                 wprintf("/groupdav/");
 239                 urlescputs(WC->wc_roomname);
 240                 euid_escapize(encoded_uid, dav_uid);
 241                 wprintf("/%s", encoded_uid);
 242                 wprintf("</D:href>");
 243                 wprintf("<D:propstat>");
 244                 wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 245                 wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", dav_msgnum);
 246                 wprintf("</D:propstat>");
 247
 248                 wprintf("</D:response>\n");
 249                 wprintf("</D:multistatus>\n");
 250                 end_burst();
 251                 return;
 252         }
 253
 254
 255         /*
 256          * We got to this point, which means that the client is requesting
 257          * a 'collection' (i.e. a list of all items in the room).
 258          *
 259          * Be rude.  Completely ignore the XML request and simply send them
 260          * everything we know about (which is going to simply be the ETag and
 261          * nothing else).  Let the client-side parser sort it out.
 262          */
 263         wprintf("HTTP/1.1 207 Multi-Status\r\n");
 264         groupdav_common_headers();
 265         wprintf("Date: %s\r\n", datestring);
 266         wprintf("Content-type: text/xml\r\n");
 267         wprintf("Content-encoding: identity\r\n");
 268
 269         begin_burst();
 270
 271         wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 272                 "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 273         );
 274
 275         serv_puts("MSGS ALL");
 276         serv_getln(buf, sizeof buf);
 277         if (buf[0] == '1') while (serv_getln(msgnum, sizeof msgnum), strcmp(msgnum, "000")) {
 278                 msgs = realloc(msgs, ++num_msgs * sizeof(long));
 279                 msgs[num_msgs-1] = atol(msgnum);
 280         }
 281
 282         if (num_msgs > 0) for (i=0; i<num_msgs; ++i) {
 283
 284                 strcpy(uid, "");
 285                 serv_printf("MSG0 %ld|3", msgs[i]);
 286                 serv_getln(buf, sizeof buf);
 287                 if (buf[0] == '1') while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 288                         if (!strncasecmp(buf, "exti=", 5)) {
 289                                 strcpy(uid, &buf[5]);
 290                         }
 291                 }
 292
 293                 if (strlen(uid) > 0) {
 294                         wprintf("<D:response>");
 295                         wprintf("<D:href>");
 296                         if (strlen(WC->http_host) > 0) {
 297                                 wprintf("%s://%s",
 298                                         (is_https ? "https" : "http"),
 299                                         WC->http_host);
 300                         }
 301                         wprintf("/groupdav/");
 302                         urlescputs(WC->wc_roomname);
 303                         euid_escapize(encoded_uid, uid);
 304                         wprintf("/%s", encoded_uid);
 305                         wprintf("</D:href>");
 306                         wprintf("<D:propstat>");
 307                         wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 308                         wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", msgs[i]);
 309                         wprintf("</D:propstat>");
 310                         wprintf("</D:response>");
 311                 }
 312         }
 313
 314         wprintf("</D:multistatus>\n");
 315         end_burst();
 316
 317         if (msgs != NULL) {
 318                 free(msgs);
 319         }
 320 }