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                         if (strlen(WC->http_host) > 0) {
 101                                 wprintf("%s://%s",
 102                                         (is_https ? "https" : "http"),
 103                                         WC->http_host);
 104                         }
 105                         wprintf("/groupdav/");
 106                         urlescputs(roomname);
 107                         wprintf("/</D:href>");
 108
 109                         wprintf("<D:propstat>");
 110                         wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 111                         wprintf("<D:prop>");
 112                         wprintf("<D:displayname>");
 113                         escputs(roomname);
 114                         wprintf("</D:displayname>");
 115                         wprintf("<D:resourcetype><D:collection/>");
 116
 117                         switch(view) {
 118                                 case VIEW_CALENDAR:
 119                                         wprintf("<G:vevent-collection />");
 120                                         break;
 121                                 case VIEW_TASKS:
 122                                         wprintf("<G:vtodo-collection />");
 123                                         break;
 124                                 case VIEW_ADDRESSBOOK:
 125                                         wprintf("<G:vcard-collection />");
 126                                         break;
 127                         }
 128
 129                         wprintf("</D:resourcetype>");
 130                         wprintf("</D:prop>");
 131                         wprintf("</D:propstat>");
 132                         wprintf("</D:response>");
 133                 }
 134         }
 135         wprintf("</D:multistatus>\n");
 136
 137         end_burst();
 138 }
 139
 140
 141
 142 /*
 143  * The pathname is always going to be /groupdav/room_name/msg_num
 144  */
 145 void groupdav_propfind(char *dav_pathname) {
 146         char dav_roomname[256];
 147         char dav_uid[256];
 148         char msgnum[256];
 149         long dav_msgnum = (-1);
 150         char buf[256];
 151         char uid[256];
 152         char encoded_uid[256];
 153         long *msgs = NULL;
 154         int num_msgs = 0;
 155         int i;
 156         char datestring[256];
 157         time_t now;
 158
 159         now = time(NULL);
 160         http_datestring(datestring, sizeof datestring, now);
 161
 162         extract_token(dav_roomname, dav_pathname, 2, '/', sizeof dav_roomname);
 163         extract_token(dav_uid, dav_pathname, 3, '/', sizeof dav_uid);
 164
 165         lprintf(9, "dav_pathname: %s\n", dav_pathname);
 166         lprintf(9, "dav_roomname: %s\n", dav_roomname);
 167         lprintf(9, "     dav_uid: %s\n", dav_uid);
 168
 169         /*
 170          * If the room name is blank, the client is requesting a
 171          * folder list.
 172          */
 173         if (strlen(dav_roomname) == 0) {
 174                 groupdav_folder_list();
 175                 return;
 176         }
 177
 178         /* Go to the correct room. */
 179         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 180                 gotoroom(dav_roomname);
 181         }
 182         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
 183                 wprintf("HTTP/1.1 404 not found\r\n");
 184                 groupdav_common_headers();
 185                 wprintf("Date: %s\r\n", datestring);
 186                 wprintf(
 187                         "Content-Type: text/plain\r\n"
 188                         "\r\n"
 189                         "There is no folder called \"%s\" on this server.\r\n",
 190                         dav_roomname
 191                 );
 192                 return;
 193         }
 194
 195         /* If dav_uid is non-empty, client is requesting a PROPFIND on
 196          * a specific item in the room.  This is not valid GroupDAV, but
 197          * we try to honor it anyway because some clients are expecting
 198          * it to work...
 199          */
 200         if (strlen(dav_uid) > 0) {
 201
 202                 dav_msgnum = locate_message_by_uid(dav_uid);
 203                 if (dav_msgnum < 0) {
 204                         wprintf("HTTP/1.1 404 not found\r\n");
 205                         groupdav_common_headers();
 206                         wprintf(
 207                                 "Content-Type: text/plain\r\n"
 208                                 "\r\n"
 209                                 "Object \"%s\" was not found in the \"%s\" folder.\r\n",
 210                                 dav_uid,
 211                                 dav_roomname
 212                         );
 213                         return;
 214                 }
 215
 216                 /* Be rude.  Completely ignore the XML request and simply send them
 217                  * everything we know about (which is going to simply be the ETag and
 218                  * nothing else).  Let the client-side parser sort it out.
 219                  */
 220                 wprintf("HTTP/1.0 207 Multi-Status\r\n");
 221                 groupdav_common_headers();
 222                 wprintf("Date: %s\r\n", datestring);
 223                 wprintf("Content-type: text/xml\r\n");
 224                 wprintf("Content-encoding: identity\r\n");
 225
 226                 begin_burst();
 227
 228                 wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 229                         "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 230                 );
 231
 232                 wprintf("<D:response>");
 233
 234                 wprintf("<D:href>");
 235                 if (strlen(WC->http_host) > 0) {
 236                         wprintf("%s://%s",
 237                                 (is_https ? "https" : "http"),
 238                                 WC->http_host);
 239                 }
 240                 wprintf("/groupdav/");
 241                 urlescputs(WC->wc_roomname);
 242                 euid_escapize(encoded_uid, dav_uid);
 243                 wprintf("/%s", encoded_uid);
 244                 wprintf("</D:href>");
 245                 wprintf("<D:propstat>");
 246                 wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 247                 wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", dav_msgnum);
 248                 wprintf("</D:propstat>");
 249
 250                 wprintf("</D:response>\n");
 251                 wprintf("</D:multistatus>\n");
 252                 end_burst();
 253                 return;
 254         }
 255
 256
 257         /*
 258          * We got to this point, which means that the client is requesting
 259          * a 'collection' (i.e. a list of all items in the room).
 260          *
 261          * Be rude.  Completely ignore the XML request and simply send them
 262          * everything we know about (which is going to simply be the ETag and
 263          * nothing else).  Let the client-side parser sort it out.
 264          */
 265         wprintf("HTTP/1.0 207 Multi-Status\r\n");
 266         groupdav_common_headers();
 267         wprintf("Date: %s\r\n", datestring);
 268         wprintf("Content-type: text/xml\r\n");
 269         wprintf("Content-encoding: identity\r\n");
 270
 271         begin_burst();
 272
 273         wprintf("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 274                 "<D:multistatus xmlns:D=\"DAV:\" xmlns:G=\"http://groupdav.org/\">"
 275         );
 276
 277         serv_puts("MSGS ALL");
 278         serv_getln(buf, sizeof buf);
 279         if (buf[0] == '1') while (serv_getln(msgnum, sizeof msgnum), strcmp(msgnum, "000")) {
 280                 msgs = realloc(msgs, ++num_msgs * sizeof(long));
 281                 msgs[num_msgs-1] = atol(msgnum);
 282         }
 283
 284         if (num_msgs > 0) for (i=0; i<num_msgs; ++i) {
 285
 286                 strcpy(uid, "");
 287                 serv_printf("MSG0 %ld|3", msgs[i]);
 288                 serv_getln(buf, sizeof buf);
 289                 if (buf[0] == '1') while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 290                         if (!strncasecmp(buf, "exti=", 5)) {
 291                                 strcpy(uid, &buf[5]);
 292                         }
 293                 }
 294
 295                 if (strlen(uid) > 0) {
 296                         wprintf("<D:response>");
 297                         wprintf("<D:href>");
 298                         if (strlen(WC->http_host) > 0) {
 299                                 wprintf("%s://%s",
 300                                         (is_https ? "https" : "http"),
 301                                         WC->http_host);
 302                         }
 303                         wprintf("/groupdav/");
 304                         urlescputs(WC->wc_roomname);
 305                         euid_escapize(encoded_uid, uid);
 306                         wprintf("/%s", encoded_uid);
 307                         wprintf("</D:href>");
 308                         wprintf("<D:propstat>");
 309                         wprintf("<D:status>HTTP/1.1 200 OK</D:status>");
 310                         wprintf("<D:prop><D:getetag>\"%ld\"</D:getetag></D:prop>", msgs[i]);
 311                         wprintf("</D:propstat>");
 312                         wprintf("</D:response>");
 313                 }
 314         }
 315
 316         wprintf("</D:multistatus>\n");
 317         end_burst();
 318
 319         if (msgs != NULL) {
 320                 free(msgs);
 321         }
 322 }