webcit-ng/forum_view.c

   1 //
   2 // Forum view (threaded/flat)
   3 //
   4 // Copyright (c) 1996-2021 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 struct mthread {
  19         long msgnum;
  20         time_t datetime;
  21         int threadhash;
  22         int refhashes[10];
  23         char from[64];
  24         int parent;
  25 };
  26
  27
  28 // Commands we need to send to Citadel Server before we begin rendering forum view.
  29 // These are common to flat and threaded views.
  30 void setup_for_forum_view(struct ctdlsession *c) {
  31         char buf[1024];
  32         ctdl_printf(c, "MSGP text/html|text/plain");    // Declare the MIME types we know how to render
  33         ctdl_readline(c, buf, sizeof(buf));             // Ignore the response
  34         ctdl_printf(c, "MSGP dont_decode");             // Tell the server we will decode base64/etc client-side
  35         ctdl_readline(c, buf, sizeof(buf));             // Ignore the response
  36 }
  37
  38
  39 // Fetch a single message and return it in JSON format for client-side rendering
  40 void json_render_one_message(struct http_transaction *h, struct ctdlsession *c, long msgnum) {
  41         StrBuf *raw_msg = NULL;
  42         StrBuf *sanitized_msg = NULL;
  43         char buf[1024];
  44         char content_transfer_encoding[1024] = { 0 };
  45         char content_type[1024] = { 0 };
  46         char datetime[128] = { 0 };
  47         char author[1024] = { 0 };
  48         char emailaddr[1024] = { 0 };
  49         int message_originated_locally = 0;
  50
  51         setup_for_forum_view(c);
  52
  53         ctdl_printf(c, "MSG4 %ld", msgnum);
  54         ctdl_readline(c, buf, sizeof(buf));
  55         if (buf[0] != '1') {
  56                 do_404(h);
  57                 return;
  58         }
  59
  60         JsonValue *j = NewJsonObject(HKEY("message"));
  61
  62         while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "text")) && (strcmp(buf, "000"))) {
  63
  64                 // citadel header parsing here
  65                 if (!strncasecmp(buf, "from=", 5)) {
  66                         safestrncpy(author, &buf[5], sizeof author);
  67                 }
  68                 else if (!strncasecmp(buf, "rfca=", 5)) {
  69                         safestrncpy(emailaddr, &buf[5], sizeof emailaddr);
  70                 }
  71                 else if (!strncasecmp(buf, "time=", 5)) {
  72                         time_t tt;
  73                         struct tm tm;
  74                         tt = atol(&buf[5]);
  75                         localtime_r(&tt, &tm);
  76                         strftime(datetime, sizeof datetime, "%c", &tm);
  77                         JsonObjectAppend(j, NewJsonPlainString(HKEY("time"), datetime, -1));
  78                 }
  79                 else if (!strncasecmp(buf, "locl=", 5)) {
  80                         message_originated_locally = 1;
  81                 }
  82                 else if (!strncasecmp(buf, "subj=", 5)) {
  83                         JsonObjectAppend(j, NewJsonPlainString(HKEY("subj"), &buf[5], -1));
  84                 }
  85         }
  86
  87         if (message_originated_locally) {
  88                 JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), author, -1));
  89         }
  90         else {
  91                 JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), emailaddr, -1));           // FIXME do the compound address string
  92         }
  93
  94         if (!strcmp(buf, "text")) {
  95                 while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "")) && (strcmp(buf, "000"))) {
  96                         // rfc822 header parsing here
  97                         if (!strncasecmp(buf, "Content-transfer-encoding:", 26)) {
  98                                 strcpy(content_transfer_encoding, &buf[26]);
  99                                 striplt(content_transfer_encoding);
 100                         }
 101                         if (!strncasecmp(buf, "Content-type:", 13)) {
 102                                 strcpy(content_type, &buf[13]);
 103                                 striplt(content_type);
 104                         }
 105                 }
 106                 raw_msg = ctdl_readtextmsg(c);
 107         }
 108         else {
 109                 raw_msg = NULL;
 110         }
 111
 112         if (raw_msg) {
 113                 // These are the encodings we know how to handle.  Decode in-place.
 114
 115                 if (!strcasecmp(content_transfer_encoding, "base64")) {
 116                         StrBufDecodeBase64(raw_msg);
 117                 }
 118                 if (!strcasecmp(content_transfer_encoding, "quoted-printable")) {
 119                         StrBufDecodeQP(raw_msg);
 120                 }
 121
 122                 // At this point, raw_msg contains the decoded message.
 123                 // Now run through the renderers we have available.
 124
 125                 if (!strncasecmp(content_type, "text/html", 9)) {
 126                         sanitized_msg = html2html("UTF-8", 0, c->room, msgnum, raw_msg);
 127                 }
 128                 else if (!strncasecmp(content_type, "text/plain", 10)) {
 129                         sanitized_msg = text2html("UTF-8", 0, c->room, msgnum, raw_msg);
 130                 }
 131                 else if (!strncasecmp(content_type, "text/x-citadel-variformat", 25)) {
 132                         sanitized_msg = variformat2html(raw_msg);
 133                 }
 134                 else {
 135                         sanitized_msg = NewStrBufPlain(HKEY("<i>No renderer for this content type</i><br>"));
 136                         syslog(LOG_WARNING, "forum_view: no renderer for content type %s", content_type);
 137                 }
 138                 FreeStrBuf(&raw_msg);
 139
 140                 // If sanitized_msg is not NULL, we have rendered the message and can output it.
 141                 if (sanitized_msg) {
 142                         JsonObjectAppend(j, NewJsonString(HKEY("text"), sanitized_msg, NEWJSONSTRING_SMASHBUF));
 143                 }
 144                 else {
 145                         syslog(LOG_WARNING, "forum_view: message %ld of content type %s converted to NULL", msgnum, content_type);
 146                 }
 147         }
 148
 149         StrBuf *sj = NewStrBuf();
 150         SerializeJson(sj, j, 1);        // '1' == free the source object
 151
 152         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 153         h->response_code = 200;
 154         h->response_string = strdup("OK");
 155         h->response_body_length = StrLength(sj);
 156         h->response_body = SmashStrBuf(&sj);
 157 }