webcit-ng/messages.c

   1 //
   2 // Message base functions
   3 //
   4 // Copyright (c) 1996-2018 by the citadel.org team
   5 //
   6 // This program is open source software.  It runs great on the
   7 // Linux operating system (and probably elsewhere).  You can use,
   8 // copy, and run it under the terms of the GNU General Public
   9 // License version 3.
  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 #include "webcit.h"
  17
  18
  19 // Given an encoded UID, translate that to an unencoded Citadel EUID and
  20 // then search for it in the current room.  Return a message number or -1
  21 // if not found.
  22 long locate_message_by_uid(struct ctdlsession *c, char *uid) {
  23         char buf[1024];
  24
  25         ctdl_printf(c, "EUID %s", uid);
  26         ctdl_readline(c, buf, sizeof buf);
  27         if (buf[0] == '2') {
  28                 return (atol(&buf[4]));
  29
  30         }
  31
  32         // Ugly hack to handle Mozilla Thunderbird, try stripping ".ics" if present
  33         if (!strcasecmp(&uid[strlen(uid) - 4], ".ics")) {
  34                 safestrncpy(buf, uid, sizeof buf);
  35                 buf[strlen(buf) - 4] = 0;
  36                 ctdl_printf(c, "EUID %s", buf);
  37                 ctdl_readline(c, buf, sizeof buf);
  38                 if (buf[0] == '2') {
  39                         return (atol(&buf[4]));
  40
  41                 }
  42         }
  43
  44         return (-1);
  45 }
  46
  47
  48 // DAV delete an object in a room.
  49 void dav_delete_message(struct http_transaction *h, struct ctdlsession *c, long msgnum) {
  50         ctdl_delete_msgs(c, &msgnum, 1);
  51         h->response_code = 204;
  52         h->response_string = strdup("no content");
  53 }
  54
  55
  56 // GET method directly on a message in a room
  57 void dav_get_message(struct http_transaction *h, struct ctdlsession *c, long msgnum) {
  58         char buf[1024];
  59         int in_body = 0;
  60         int encoding = 0;
  61         StrBuf *Body = NULL;
  62
  63         ctdl_printf(c, "MSG2 %ld", msgnum);
  64         ctdl_readline(c, buf, sizeof buf);
  65         if (buf[0] != '1') {
  66                 do_404(h);
  67                 return;
  68         }
  69
  70         char *etag = malloc(20);
  71         if (etag != NULL) {
  72                 sprintf(etag, "%ld", msgnum);
  73                 add_response_header(h, strdup("ETag"), etag);   // http_transaction now owns this memory
  74         }
  75
  76         while (ctdl_readline(c, buf, sizeof buf), strcmp(buf, "000")) {
  77                 if (IsEmptyStr(buf) && (in_body == 0)) {
  78                         in_body = 1;
  79                         Body = NewStrBuf();
  80                 } else if (in_body == 0) {
  81                         char *k = buf;
  82                         char *v = strchr(buf, ':');
  83                         if (v) {
  84                                 *v = 0;
  85                                 ++v;
  86                                 striplt(v);     // we now have a key (k) and a value (v)
  87                                 if ((!strcasecmp(k, "content-type"))    // fields which can be passed from RFC822 to HTTP as-is
  88                                     || (!strcasecmp(k, "date"))
  89                                     ) {
  90                                         add_response_header(h, strdup(k), strdup(v));
  91                                 } else if (!strcasecmp(k, "content-transfer-encoding")) {
  92                                         if (!strcasecmp(v, "base64")) {
  93                                                 encoding = 'b';
  94                                         } else if (!strcasecmp(v, "quoted-printable")) {
  95                                                 encoding = 'q';
  96                                         }
  97                                 }
  98                         }
  99                 } else if ((in_body == 1) && (Body != NULL)) {
 100                         StrBufAppendPrintf(Body, "%s\n", buf);
 101                 }
 102         }
 103
 104         h->response_code = 200;
 105         h->response_string = strdup("OK");
 106
 107         if (Body != NULL) {
 108                 if (encoding == 'q') {
 109                         h->response_body = malloc(StrLength(Body));
 110                         if (h->response_body != NULL) {
 111                                 h->response_body_length =
 112                                     CtdlDecodeQuotedPrintable(h->response_body, (char *) ChrPtr(Body), StrLength(Body));
 113                         }
 114                         FreeStrBuf(&Body);
 115                 } else if (encoding == 'b') {
 116                         h->response_body = malloc(StrLength(Body));
 117                         if (h->response_body != NULL) {
 118                                 h->response_body_length = CtdlDecodeBase64(h->response_body, ChrPtr(Body), StrLength(Body));
 119                         }
 120                         FreeStrBuf(&Body);
 121                 } else {
 122                         h->response_body_length = StrLength(Body);
 123                         h->response_body = SmashStrBuf(&Body);
 124                 }
 125         }
 126 }
 127
 128
 129 // PUT a message into a room
 130 void dav_put_message(struct http_transaction *h, struct ctdlsession *c, char *euid, long old_msgnum) {
 131         char buf[1024];
 132         char *content_type = NULL;
 133         int n;
 134         long new_msgnum;
 135         char new_euid[1024];
 136         char response_string[1024];
 137
 138         if ((h->request_body == NULL) || (h->request_body_length < 1)) {
 139                 do_404(h);                      // Refuse to post a null message
 140                 return;
 141         }
 142
 143         ctdl_printf(c, "ENT0 1|||4|||1|");      // This protocol syntax will give us metadata back after upload
 144         ctdl_readline(c, buf, sizeof buf);
 145         if (buf[0] != '8') {
 146                 h->response_code = 502;
 147                 h->response_string = strdup("bad gateway");
 148                 add_response_header(h, strdup("Content-type"), strdup("text/plain"));
 149                 h->response_body = strdup(buf);
 150                 h->response_body_length = strlen(h->response_body);
 151                 return;
 152         }
 153
 154         content_type = header_val(h, "Content-type");
 155         ctdl_printf(c, "Content-type: %s\r\n", (content_type ? content_type : "application/octet-stream"));
 156         ctdl_printf(c, "\r\n");
 157         ctdl_write(c, h->request_body, h->request_body_length);
 158         if (h->request_body[h->request_body_length] != '\n') {
 159                 ctdl_printf(c, "\r\n");
 160         }
 161         ctdl_printf(c, "000");
 162
 163         // Now handle the response from the Citadel server.
 164
 165         n = 0;
 166         new_msgnum = 0;
 167         strcpy(new_euid, "");
 168         strcpy(response_string, "");
 169
 170         while (ctdl_readline(c, buf, sizeof buf), strcmp(buf, "000"))
 171                 switch (n++) {
 172                 case 0:
 173                         new_msgnum = atol(buf);
 174                         break;
 175                 case 1:
 176                         safestrncpy(response_string, buf, sizeof response_string);
 177                         syslog(LOG_DEBUG, "new_msgnum=%ld (%s)\n", new_msgnum, buf);
 178                         break;
 179                 case 2:
 180                         safestrncpy(new_euid, buf, sizeof new_euid);
 181                         break;
 182                 default:
 183                         break;
 184                 }
 185
 186         // Tell the client what happened.
 187
 188         // Citadel failed in some way?
 189         char *new_location = malloc(1024);
 190         if ((new_msgnum < 0L) || (new_location == NULL)) {
 191                 h->response_code = 502;
 192                 h->response_string = strdup("bad gateway");
 193                 add_response_header(h, strdup("Content-type"), strdup("text/plain"));
 194                 h->response_body = strdup(response_string);
 195                 h->response_body_length = strlen(h->response_body);
 196                 return;
 197         }
 198
 199         char *etag = malloc(20);
 200         if (etag != NULL) {
 201                 sprintf(etag, "%ld", new_msgnum);
 202                 add_response_header(h, strdup("ETag"), etag);   // http_transaction now owns this memory
 203         }
 204
 205         char esc_room[1024];
 206         char esc_euid[1024];
 207         urlesc(esc_room, sizeof esc_room, c->room);
 208         urlesc(esc_euid, sizeof esc_euid, new_euid);
 209         snprintf(new_location, 1024, "/ctdl/r/%s/%s", esc_room, esc_euid);
 210         add_response_header(h, strdup("Location"), new_location);       // http_transaction now owns this memory
 211
 212         if (old_msgnum <= 0) {
 213                 h->response_code = 201; // We created this item for the first time.
 214                 h->response_string = strdup("created");
 215         } else {
 216                 h->response_code = 204; // We modified an existing item.
 217                 h->response_string = strdup("no content");
 218
 219                 // The item we replaced has probably already been deleted by
 220                 // the Citadel server, but we'll do this anyway, just in case.
 221                 ctdl_delete_msgs(c, &old_msgnum, 1);
 222         }
 223
 224 }
 225
 226
 227 // Download a single component of a MIME-encoded message
 228 void download_mime_component(struct http_transaction *h, struct ctdlsession *c, long msgnum, char *partnum) {
 229         char buf[1024];
 230         char content_type[1024];
 231
 232         ctdl_printf(c, "DLAT %ld|%s", msgnum, partnum);
 233         ctdl_readline(c, buf, sizeof buf);
 234         if (buf[0] != '6') {
 235                 do_404(h);      // too bad, so sad, go away
 236         }
 237         // Server response is going to be: 6XX length|-1|filename|content-type|charset
 238         h->response_body_length = extract_int(&buf[4], 0);
 239         extract_token(content_type, buf, 3, '|', sizeof content_type);
 240
 241         h->response_body = malloc(h->response_body_length + 1);
 242         int bytes = 0;
 243         int thisblock;
 244         do {
 245                 thisblock = read(c->sock, &h->response_body[bytes], (h->response_body_length - bytes));
 246                 bytes += thisblock;
 247                 syslog(LOG_DEBUG, "Bytes read: %d of %d", (int) bytes, (int) h->response_body_length);
 248         } while ((bytes < h->response_body_length) && (thisblock >= 0));
 249         h->response_body[h->response_body_length] = 0;  // null terminate it just for good measure
 250         syslog(LOG_DEBUG, "content type: %s", content_type);
 251
 252         add_response_header(h, strdup("Content-type"), strdup(content_type));
 253         h->response_code = 200;
 254         h->response_string = strdup("OK");
 255 }