1 // The code in here feeds messages out as JSON to the client browser. It is currently being used
2 // for the forum view, but as we implement other views we'll probably reuse a lot of what's here.
4 // Copyright (c) 1996-2022 by the citadel.org team
6 // This program is open source software. Use, duplication, or
7 // disclosure are subject to the GNU General Public License v3.
11 // Commands we need to send to Citadel Server before we begin rendering forum view.
12 // These are common to flat and threaded views.
13 void setup_for_forum_view(struct ctdlsession *c) {
15 ctdl_printf(c, "MSGP text/html|text/plain"); // Declare the MIME types we know how to render
16 ctdl_readline(c, buf, sizeof(buf)); // Ignore the response
17 ctdl_printf(c, "MSGP dont_decode"); // Tell the server we will decode base64/etc client-side
18 ctdl_readline(c, buf, sizeof(buf)); // Ignore the response
22 // Fetch a single message and return it in JSON format for client-side rendering
23 void json_render_one_message(struct http_transaction *h, struct ctdlsession *c, long msgnum) {
24 StrBuf *raw_msg = NULL;
25 StrBuf *sanitized_msg = NULL;
27 char content_transfer_encoding[1024] = { 0 };
28 char content_type[1024] = { 0 };
29 char datetime[128] = { 0 };
30 char author[1024] = { 0 };
31 char emailaddr[1024] = { 0 };
32 int message_originated_locally = 0;
34 setup_for_forum_view(c);
36 ctdl_printf(c, "MSG4 %ld", msgnum);
37 ctdl_readline(c, buf, sizeof(buf));
43 JsonValue *j = NewJsonObject(HKEY("message"));
44 JsonObjectAppend(j, NewJsonNumber(HKEY("msgnum"), msgnum));
46 while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "text")) && (strcmp(buf, "000"))) {
47 utf8ify_rfc822_string(&buf[5]);
49 // citadel header parsing here
50 if (!strncasecmp(buf, "from=", 5)) {
51 safestrncpy(author, &buf[5], sizeof author);
53 else if (!strncasecmp(buf, "rfca=", 5)) {
54 safestrncpy(emailaddr, &buf[5], sizeof emailaddr);
56 else if (!strncasecmp(buf, "time=", 5)) {
57 JsonObjectAppend(j, NewJsonNumber(HKEY("time"), atol(&buf[5])));
59 else if (!strncasecmp(buf, "locl=", 5)) {
60 message_originated_locally = 1;
62 else if (!strncasecmp(buf, "subj=", 5)) {
63 JsonObjectAppend(j, NewJsonPlainString(HKEY("subj"), &buf[5], -1));
65 else if (!strncasecmp(buf, "msgn=", 5)) {
66 JsonObjectAppend(j, NewJsonPlainString(HKEY("msgn"), &buf[5], -1));
68 else if (!strncasecmp(buf, "wefw=", 5)) {
69 JsonObjectAppend(j, NewJsonPlainString(HKEY("wefw"), &buf[5], -1));
73 if (message_originated_locally) {
74 JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), author, -1));
77 JsonObjectAppend(j, NewJsonPlainString(HKEY("from"), emailaddr, -1)); // FIXME do compound address string
80 if (!strcmp(buf, "text")) {
81 while ((ctdl_readline(c, buf, sizeof(buf)) >= 0) && (strcmp(buf, "")) && (strcmp(buf, "000"))) {
82 // rfc822 header parsing here
83 if (!strncasecmp(buf, "Content-transfer-encoding:", 26)) {
84 strcpy(content_transfer_encoding, &buf[26]);
85 striplt(content_transfer_encoding);
87 if (!strncasecmp(buf, "Content-type:", 13)) {
88 strcpy(content_type, &buf[13]);
89 striplt(content_type);
92 if (!strcmp(buf, "000")) { // if we have an empty message, don't try to read further
96 raw_msg = ctdl_readtextmsg(c);
104 // These are the encodings we know how to handle. Decode in-place.
106 if (!strcasecmp(content_transfer_encoding, "base64")) {
107 StrBufDecodeBase64(raw_msg);
109 if (!strcasecmp(content_transfer_encoding, "quoted-printable")) {
110 StrBufDecodeQP(raw_msg);
113 // At this point, raw_msg contains the decoded message.
114 // Now run through the renderers we have available.
116 if (!strncasecmp(content_type, "text/html", 9)) {
117 sanitized_msg = html2html("UTF-8", 0, c->room, msgnum, raw_msg);
119 else if (!strncasecmp(content_type, "text/plain", 10)) {
120 sanitized_msg = text2html("UTF-8", 0, c->room, msgnum, raw_msg);
122 else if (!strncasecmp(content_type, "text/x-citadel-variformat", 25)) {
123 sanitized_msg = variformat2html(raw_msg);
126 sanitized_msg = NewStrBufPlain(HKEY("<i>No renderer for this content type</i><br>"));
127 syslog(LOG_WARNING, "forum_view: no renderer for content type %s", content_type);
129 FreeStrBuf(&raw_msg);
131 // If sanitized_msg is not NULL, we have rendered the message and can output it.
133 JsonObjectAppend(j, NewJsonString(HKEY("text"), sanitized_msg, NEWJSONSTRING_SMASHBUF));
136 syslog(LOG_WARNING, "forum_view: message %ld of content type %s converted to NULL", msgnum, content_type);
140 StrBuf *sj = NewStrBuf();
141 SerializeJson(sj, j, 1); // '1' == free the source object
143 add_response_header(h, strdup("Content-type"), strdup("application/json"));
144 h->response_code = 200;
145 h->response_string = strdup("OK");
146 h->response_body_length = StrLength(sj);
147 h->response_body = SmashStrBuf(&sj);