webcit-ng/forum_view.c

   1 /*
   2  * Forum view (threaded/flat)
   3  *
   4  * Copyright (c) 1996-2018 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "webcit.h"
  16
  17 struct mthread {
  18         long msgnum;
  19         time_t datetime;
  20         int threadhash;
  21         int refhashes[10];
  22         char from[64];
  23         int parent;
  24 };
  25
  26
  27 // Commands we need to send to Citadel Server before we begin rendering forum view.
  28 // These are common to flat and threaded views.
  29 //
  30 void setup_for_forum_view(struct ctdlsession *c)
  31 {
  32         char buf[1024];
  33         ctdl_printf(c, "MSGP text/html|text/plain");    // Declare the MIME types we know how to render
  34         ctdl_readline(c, buf, sizeof(buf));             // Ignore the response
  35         ctdl_printf(c, "MSGP dont_decode");             // Tell the server we will decode base64/etc client-side
  36         ctdl_readline(c, buf, sizeof(buf));             // Ignore the response
  37 }
  38
  39
  40 // Fetch a single message and return it in JSON format for client-side rendering
  41 //
  42 void json_render_one_message(struct http_transaction *h, struct ctdlsession *c, long msgnum)
  43 {
  44         StrBuf *raw_msg = NULL;
  45         StrBuf *sanitized_msg = NULL;
  46         char buf[1024];
  47         char content_transfer_encoding[1024] = { 0 };
  48         char content_type[1024] = { 0 };
  49         char author[128] = { 0 };
  50         char datetime[128] = { 0 };
  51
  52         setup_for_forum_view(c);
  53
  54         ctdl_printf(c, "MSG4 %ld", msgnum);
  55         ctdl_readline(c, buf, sizeof(buf));
  56         if (buf[0] != '1') {
  57                 do_404(h);
  58                 return;
  59         }
  60
  61         JsonValue *j = NewJsonObject(HKEY("message"));
  62
  63         while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "text")) && (strcmp(buf, "000"))) {
  64                 // citadel header parsing here
  65                 if (!strncasecmp(buf, "from=", 5)) {
  66                         JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), &buf[5], -1));
  67                 }
  68                 if (!strncasecmp(buf, "rfca=", 5)) {
  69                         JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), &buf[5], -1));
  70                 }
  71                 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         }
  80
  81         if (!strcmp(buf, "text")) {
  82                 while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "")) && (strcmp(buf, "000"))) {
  83                         // rfc822 header parsing here
  84                         if (!strncasecmp(buf, "Content-transfer-encoding:", 26)) {
  85                                 strcpy(content_transfer_encoding, &buf[26]);
  86                                 striplt(content_transfer_encoding);
  87                         }
  88                         if (!strncasecmp(buf, "Content-type:", 13)) {
  89                                 strcpy(content_type, &buf[13]);
  90                                 striplt(content_type);
  91                         }
  92                 }
  93                 raw_msg = ctdl_readtextmsg(c);
  94         } else {
  95                 raw_msg = NULL;
  96         }
  97
  98         if (raw_msg) {
  99
 100                 // These are the encodings we know how to handle.  Decode in-place.
 101
 102                 if (!strcasecmp(content_transfer_encoding, "base64")) {
 103                         StrBufDecodeBase64(raw_msg);
 104                 }
 105                 if (!strcasecmp(content_transfer_encoding, "quoted-printable")) {
 106                         StrBufDecodeQP(raw_msg);
 107                 }
 108                 // At this point, raw_msg contains the decoded message.
 109                 // Now run through the renderers we have available.
 110
 111                 if (!strncasecmp(content_type, "text/html", 9)) {
 112                         sanitized_msg = html2html("UTF-8", 0, c->room, msgnum, raw_msg);
 113                 } else if (!strncasecmp(content_type, "text/plain", 10)) {
 114                         sanitized_msg = text2html("UTF-8", 0, c->room, msgnum, raw_msg);
 115                 } else if (!strncasecmp(content_type, "text/x-citadel-variformat", 25)) {
 116                         sanitized_msg = variformat2html(raw_msg);
 117                 } else {
 118                         sanitized_msg = NewStrBufPlain(HKEY("<i>No renderer for this content type</i><br>"));
 119                 }
 120                 FreeStrBuf(&raw_msg);
 121
 122                 // If sanitized_msg is not NULL, we have rendered the message and can output it.
 123
 124                 if (sanitized_msg) {
 125                         JsonObjectAppend(j, NewJsonString(HKEY("text"), sanitized_msg, NEWJSONSTRING_SMASHBUF));
 126                 }
 127         }
 128
 129         StrBuf *sj = NewStrBuf();
 130         SerializeJson(sj, j, 1);        // '1' == free the source object
 131
 132         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 133         h->response_code = 200;
 134         h->response_string = strdup("OK");
 135         h->response_body_length = StrLength(sj);
 136         h->response_body = SmashStrBuf(&sj);
 137 }