webcit/groupdav_put.c

   1 /*
   2  * $Id$
   3  *
   4  * Handles GroupDAV PUT requests.
   5  *
   6  */
   7
   8 #include <ctype.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/wait.h>
  16 #include <sys/socket.h>
  17 #include <limits.h>
  18 #include <string.h>
  19 #include <pwd.h>
  20 #include <errno.h>
  21 #include <stdarg.h>
  22 #include <time.h>
  23 #include <pthread.h>
  24 #include "webcit.h"
  25 #include "webserver.h"
  26 #include "groupdav.h"
  27
  28
  29 /*
  30  * The pathname is always going to be /groupdav/room_name/euid
  31  */
  32 void groupdav_put(char *dav_pathname, char *dav_ifmatch,
  33                 char *dav_content_type, char *dav_content
  34 ) {
  35         char dav_roomname[SIZ];
  36         char dav_uid[SIZ];
  37         long new_msgnum = (-2L);
  38         long old_msgnum = (-1L);
  39         char buf[SIZ];
  40         int n = 0;
  41
  42         /* First, break off the "/groupdav/" prefix */
  43         remove_token(dav_pathname, 0, '/');
  44         remove_token(dav_pathname, 0, '/');
  45
  46         /* Now extract the message euid */
  47         n = num_tokens(dav_pathname, '/');
  48         extract_token(dav_uid, dav_pathname, n-1, '/', sizeof dav_uid);
  49         remove_token(dav_pathname, n-1, '/');
  50
  51         /* What's left is the room name.  Remove trailing slashes. */
  52         if (dav_pathname[strlen(dav_pathname)-1] == '/') {
  53                 dav_pathname[strlen(dav_pathname)-1] = 0;
  54         }
  55         strcpy(dav_roomname, dav_pathname);
  56
  57         /* Go to the correct room. */
  58         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
  59                 gotoroom(dav_roomname);
  60         }
  61         if (strcasecmp(WC->wc_roomname, dav_roomname)) {
  62                 wprintf("HTTP/1.1 404 not found\r\n");
  63                 groupdav_common_headers();
  64                 wprintf(
  65                         "Content-Type: text/plain\r\n"
  66                         "\r\n"
  67                         "There is no folder called \"%s\" on this server.\r\n",
  68                         dav_roomname
  69                 );
  70                 return;
  71         }
  72
  73         /*
  74          * If an HTTP If-Match: header is present, the client is attempting
  75          * to replace an existing item.  We have to check to see if the
  76          * message number associated with the supplied uid matches what the
  77          * client is expecting.  If not, the server probably contains a newer
  78          * version, so we fail...
  79          */
  80         if (strlen(dav_ifmatch) > 0) {
  81                 lprintf(9, "dav_ifmatch: %s\n", dav_ifmatch);
  82                 old_msgnum = locate_message_by_uid(dav_uid);
  83                 lprintf(9, "old_msgnum:  %ld\n", old_msgnum);
  84                 if (atol(dav_ifmatch) != old_msgnum) {
  85                         wprintf("HTTP/1.1 412 Precondition Failed\r\n");
  86                         lprintf(9, "HTTP/1.1 412 Precondition Failed (ifmatch=%ld, old_msgnum=%ld)\r\n",
  87                                 atol(dav_ifmatch), old_msgnum);
  88                         groupdav_common_headers();
  89                         wprintf("Content-Length: 0\r\n\r\n");
  90                         return;
  91                 }
  92         }
  93
  94         /*
  95          * We are cleared for upload!  We use the new calling syntax for ENT0
  96          * which allows a confirmation to be sent back to us.  That's how we
  97          * extract the message ID.
  98          */
  99         serv_puts("ENT0 1|||4|||1|");
 100         serv_getln(buf, sizeof buf);
 101         if (buf[0] != '8') {
 102                 wprintf("HTTP/1.1 502 Bad Gateway\r\n");
 103                 groupdav_common_headers();
 104                 wprintf("Content-type: text/plain\r\n"
 105                         "\r\n"
 106                         "%s\r\n", &buf[4]
 107                 );
 108                 return;
 109         }
 110
 111         /* Send the content to the Citadel server */
 112         serv_printf("Content-type: %s\n\n", dav_content_type);
 113         serv_puts(dav_content);
 114         serv_puts("\n000");
 115
 116         /* Fetch the reply from the Citadel server */
 117         n = 0;
 118         strcpy(dav_uid, "");
 119         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 120                 switch(n++) {
 121                         case 0: new_msgnum = atol(buf);
 122                                 break;
 123                         case 1: lprintf(9, "new_msgnum=%ld (%s)\n", new_msgnum, buf);
 124                                 break;
 125                         case 2: strcpy(dav_uid, buf);
 126                                 break;
 127                         default:
 128                                 break;
 129                 }
 130         }
 131
 132         /* Tell the client what happened. */
 133
 134         /* Citadel failed in some way? */
 135         if (new_msgnum < 0L) {
 136                 wprintf("HTTP/1.1 502 Bad Gateway\r\n");
 137                 groupdav_common_headers();
 138                 wprintf("Content-type: text/plain\r\n"
 139                         "\r\n"
 140                         "new_msgnum is %ld\r\n"
 141                         "\r\n", new_msgnum
 142                 );
 143                 return;
 144         }
 145
 146         /* We created this item for the first time. */
 147         if (old_msgnum < 0L) {
 148                 wprintf("HTTP/1.1 201 Created\r\n");
 149                 lprintf(9, "HTTP/1.1 201 Created\r\n");
 150                 groupdav_common_headers();
 151                 wprintf("etag: \"%ld\"\r\n", new_msgnum);
 152                 wprintf("Content-Length: 0\r\n");
 153                 wprintf("Location: ");
 154                 if (strlen(WC->http_host) > 0) {
 155                         wprintf("%s://%s",
 156                                 (is_https ? "https" : "http"),
 157                                 WC->http_host);
 158                 }
 159                 wprintf("/groupdav/");
 160                 urlescputs(dav_roomname);
 161                 wprintf("/%s\r\n", dav_uid);
 162                 wprintf("\r\n");
 163                 return;
 164         }
 165
 166         /* We modified an existing item. */
 167         wprintf("HTTP/1.1 204 No Content\r\n");
 168         lprintf(9, "HTTP/1.1 204 No Content\r\n");
 169         groupdav_common_headers();
 170         wprintf("etag: \"%ld\"\r\n", new_msgnum);
 171         wprintf("Content-Length: 0\r\n\r\n");
 172
 173         /* The item we replaced has probably already been deleted by
 174          * the Citadel server, but we'll do this anyway, just in case.
 175          */
 176         serv_printf("DELE %ld", old_msgnum);
 177         serv_getln(buf, sizeof buf);
 178
 179         return;
 180 }