webcit/dav_get.c

   1 /*
   2  * Handles GroupDAV GET requests.
   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
   7  * modify 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
  26 /*
  27  * Fetch the entire contents of the room as one big ics file.
  28  * This is for "webcal://" type access.
  29  */
  30 void dav_get_big_ics(void) {
  31         char buf[1024];
  32
  33         serv_puts("ICAL getics");
  34         serv_getln(buf, sizeof buf);
  35         if (buf[0] != '1') {
  36                 hprintf("HTTP/1.1 404 not found\r\n");
  37                 dav_common_headers();
  38                 hprintf("Content-Type: text/plain\r\n");
  39                 begin_burst();
  40                 wc_printf("%s\r\n",
  41                         &buf[4]
  42                         );
  43                 end_burst();
  44                 return;
  45         }
  46
  47         hprintf("HTTP/1.1 200 OK\r\n");
  48         dav_common_headers();
  49         hprintf("Content-type: text/calendar; charset=UTF-8\r\n");
  50         begin_burst();
  51         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  52                 wc_printf("%s\r\n", buf);
  53         }
  54         end_burst();
  55 }
  56
  57
  58 /*
  59  * MIME parser callback function for dav_get()
  60  * Helps identify the relevant section of a multipart message
  61  */
  62 void extract_preferred(char *name, char *filename, char *partnum, char *disp,
  63                         void *content, char *cbtype, char *cbcharset,
  64                         size_t length, char *encoding, char *cbid, void *userdata)
  65 {
  66         struct epdata *epdata = (struct epdata *)userdata;
  67         int hit = 0;
  68
  69         /* We only want the first one that we found */
  70         if (!IsEmptyStr(epdata->found_section)) return;
  71
  72         /* Check for a content type match */
  73         if (strlen(epdata->desired_content_type_1) > 0) {
  74                 if (!strcasecmp(epdata->desired_content_type_1, cbtype)) {
  75                         hit = 1;
  76                 }
  77         }
  78         if (!IsEmptyStr(epdata->desired_content_type_2)) {
  79                 if (!strcasecmp(epdata->desired_content_type_2, cbtype)) {
  80                         hit = 1;
  81                 }
  82         }
  83
  84         /* Is this the one?  If so, output it. */
  85         if (hit) {
  86                 safestrncpy(epdata->found_section, partnum, sizeof epdata->found_section);
  87                 if (!IsEmptyStr(cbcharset)) {
  88                         safestrncpy(epdata->charset, cbcharset, sizeof epdata->charset);
  89                 }
  90                 hprintf("Content-type: %s; charset=%s\r\n", cbtype, epdata->charset);
  91                 begin_burst();
  92                 StrBufAppendBufPlain(WC->WBuf, content, length, 0);
  93                 end_burst();
  94         }
  95 }
  96
  97
  98
  99 /*
 100  * The pathname is always going to take one of two formats:
 101  * /groupdav/room_name/euid     (GroupDAV)
 102  * /groupdav/room_name          (webcal)
 103  */
 104 void dav_get(void)
 105 {
 106         wcsession *WCC = WC;
 107         StrBuf *dav_roomname;
 108         StrBuf *dav_uid;
 109         long dav_msgnum = (-1);
 110         char buf[1024];
 111         int in_body = 0;
 112         char *ptr;
 113         char *endptr;
 114         char *msgtext = NULL;
 115         size_t msglen = 0;
 116         size_t msgalloc = 0;
 117         int linelen;
 118         char content_type[128];
 119         char charset[128];
 120         char date[128];
 121         struct epdata epdata;
 122
 123         if (StrBufNum_tokens(WCC->Hdr->HR.ReqLine, '/') < 2) {
 124                 hprintf("HTTP/1.1 404 not found\r\n");
 125                 dav_common_headers();
 126                 hprintf("Content-Type: text/plain\r\n");
 127                 wc_printf("The object you requested was not found.\r\n");
 128                 end_burst();
 129                 return;
 130         }
 131
 132         dav_roomname = NewStrBuf();;
 133         dav_uid = NewStrBuf();;
 134         StrBufExtract_token(dav_roomname, WCC->Hdr->HR.ReqLine, 0, '/');
 135         StrBufExtract_token(dav_uid, WCC->Hdr->HR.ReqLine, 1, '/');
 136         if ((!strcasecmp(ChrPtr(dav_uid), "ics")) ||
 137             (!strcasecmp(ChrPtr(dav_uid), "calendar.ics"))) {
 138                 FlushStrBuf(dav_uid);
 139         }
 140
 141         /* Go to the correct room. */
 142         if (strcasecmp(ChrPtr(WCC->CurRoom.name), ChrPtr(dav_roomname))) {
 143                 gotoroom(dav_roomname);
 144         }
 145         if (strcasecmp(ChrPtr(WCC->CurRoom.name), ChrPtr(dav_roomname))) {
 146                 hprintf("HTTP/1.1 404 not found\r\n");
 147                 dav_common_headers();
 148                 hprintf("Content-Type: text/plain\r\n");
 149                 wc_printf("There is no folder called \"%s\" on this server.\r\n",
 150                         ChrPtr(dav_roomname));
 151                 end_burst();
 152                 FreeStrBuf(&dav_roomname);
 153                 FreeStrBuf(&dav_uid);
 154                 return;
 155         }
 156
 157         /** GET on the collection itself returns an ICS of the entire collection.
 158          */
 159         if (StrLength(dav_uid) == 0) {
 160                 dav_get_big_ics();
 161                 FreeStrBuf(&dav_roomname);
 162                 FreeStrBuf(&dav_uid);
 163                 return;
 164         }
 165
 166         dav_msgnum = locate_message_by_uid(ChrPtr(dav_uid));
 167         serv_printf("MSG2 %ld", dav_msgnum);
 168         serv_getln(buf, sizeof buf);
 169         if (buf[0] != '1') {
 170                 hprintf("HTTP/1.1 404 not found\r\n");
 171                 dav_common_headers();
 172                 hprintf("Content-Type: text/plain\r\n");
 173                 wc_printf("Object \"%s\" was not found in the \"%s\" folder.\r\n",
 174                         ChrPtr(dav_uid),
 175                         ChrPtr(dav_roomname));
 176                 end_burst();
 177                 FreeStrBuf(&dav_roomname);
 178                 FreeStrBuf(&dav_uid);
 179                 return;
 180         }
 181         FreeStrBuf(&dav_roomname);
 182         FreeStrBuf(&dav_uid);
 183
 184         /* We got it; a message is now arriving from the server.  Read it in. */
 185
 186         in_body = 0;
 187         strcpy(charset, "UTF-8");
 188         strcpy(content_type, "text/plain");
 189         strcpy(date, "");
 190         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 191                 linelen = strlen(buf);
 192
 193                 /* Append it to the buffer */
 194                 if ((msglen + linelen + 3) > msgalloc) {
 195                         msgalloc = ( (msgalloc > 0) ? (msgalloc * 2) : 1024 );
 196                         msgtext = realloc(msgtext, msgalloc);
 197                 }
 198                 strcpy(&msgtext[msglen], buf);
 199                 msglen += linelen;
 200                 strcpy(&msgtext[msglen], "\n");
 201                 msglen += 1;
 202
 203                 /* Also learn some things about the message */
 204                 if (linelen == 0) {
 205                         in_body = 1;
 206                 }
 207                 if (!in_body) {
 208                         if (!strncasecmp(buf, "Date:", 5)) {
 209                                 safestrncpy(date, &buf[5], sizeof date);
 210                                 striplt(date);
 211                         }
 212                         if (!strncasecmp(buf, "Content-type:", 13)) {
 213                                 safestrncpy(content_type, &buf[13], sizeof content_type);
 214                                 striplt(content_type);
 215                                 ptr = bmstrcasestr(&buf[13], "charset=");
 216                                 if (ptr) {
 217                                         safestrncpy(charset, ptr+8, sizeof charset);
 218                                         striplt(charset);
 219                                         endptr = strchr(charset, ';');
 220                                         if (endptr != NULL) strcpy(endptr, "");
 221                                 }
 222                                 endptr = strchr(content_type, ';');
 223                                 if (endptr != NULL) strcpy(endptr, "");
 224                         }
 225                 }
 226         }
 227         msgtext[msglen] = 0;
 228
 229         /* Output headers common to single or multi part messages */
 230
 231         hprintf("HTTP/1.1 200 OK\r\n");
 232         dav_common_headers();
 233         hprintf("etag: \"%ld\"\r\n", dav_msgnum);
 234         hprintf("Date: %s\r\n", date);
 235
 236         memset(&epdata, 0, sizeof(struct epdata));
 237         safestrncpy(epdata.charset, charset, sizeof epdata.charset);
 238
 239         /* If we have a multipart message on our hands, and we are in a groupware room,
 240          * strip it down to only the relevant part.
 241          */
 242         if (!strncasecmp(content_type, "multipart/", 10)) {
 243
 244                 if ( (WCC->CurRoom.defview == VIEW_CALENDAR) || (WCC->CurRoom.defview == VIEW_TASKS) ) {
 245                         strcpy(epdata.desired_content_type_1, "text/calendar");
 246                 }
 247
 248                 else if (WCC->CurRoom.defview == VIEW_ADDRESSBOOK) {
 249                         strcpy(epdata.desired_content_type_1, "text/vcard");
 250                         strcpy(epdata.desired_content_type_2, "text/x-vcard");
 251                 }
 252
 253                 mime_parser(msgtext, &msgtext[msglen], extract_preferred, NULL, NULL, (void *)&epdata, 0);
 254         }
 255
 256         /* If epdata.found_section is empty, we haven't output anything yet, so output the whole thing */
 257
 258         if (IsEmptyStr(epdata.found_section)) {
 259                 ptr = msgtext;
 260                 endptr = &msgtext[msglen];
 261
 262                 hprintf("Content-type: %s; charset=%s\r\n", content_type, charset);
 263
 264                 in_body = 0;
 265                 do {
 266                         ptr = memreadline(ptr, buf, sizeof buf);
 267
 268                         if (in_body) {
 269                                 wc_printf("%s\r\n", buf);
 270                         }
 271                         else if ((buf[0] == 0) && (in_body == 0)) {
 272                                 in_body = 1;
 273                                 begin_burst();
 274                         }
 275                 } while (ptr < endptr);
 276
 277                 end_burst();
 278         }
 279
 280         free(msgtext);
 281 }