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/*
* Bring external RSS feeds into rooms.
*
* Copyright (c) 2007-2017 by the citadel.org team
*
* This program is open source software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
* GNU General Public License for more details.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#include <sys/time.h>
# else
#include <time.h>
# endif
#endif
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <expat.h>
#include <curl/curl.h>
#include <libcitadel.h>
#include "citadel.h"
#include "server.h"
#include "citserver.h"
#include "support.h"
#include "config.h"
#include "threads.h"
#include "ctdl_module.h"
#include "msgbase.h"
#include "parsedate.h"
#include "database.h"
#include "citadel_dirs.h"
#include "md5.h"
#include "context.h"
#include "internet_addressing.h"
struct rssroom {
struct rssroom *next;
char *room;
};
struct rssurl {
struct rssurl *next;
char *url;
struct rssroom *rooms;
};
struct rssparser {
StrBuf *CData;
struct CtdlMessage *msg;
char *link;
char *description;
char *item_id;
struct rssroom *rooms;
};
time_t last_run = 0L;
struct CitContext rss_CC;
struct rssurl *rsstodo = NULL;
// This handler is called whenever an XML tag opens.
//
void rss_start_element(void *data, const char *el, const char **attribute)
{
struct rssparser *r = (struct rssparser *)data;
int i;
if (
(!strcasecmp(el, "entry"))
|| (!strcasecmp(el, "item"))
) {
// this is the start of a new item(rss) or entry(atom)
if (r->msg != NULL) {
CM_Free(r->msg);
r->msg = NULL;
}
r->msg = malloc(sizeof(struct CtdlMessage));
memset(r->msg, 0, sizeof(struct CtdlMessage));
r->msg->cm_magic = CTDLMESSAGE_MAGIC;
r->msg->cm_anon_type = MES_NORMAL;
r->msg->cm_format_type = FMT_RFC822;
}
else if (!strcasecmp(el, "link")) { // atom feeds have the link as an attribute
for(i = 0; attribute[i]; i += 2) {
if (!strcasecmp(attribute[i], "href")) {
if (r->link != NULL) {
free(r->link);
r->link = NULL;
}
r->link = strdup(attribute[i+1]);
striplt(r->link);
}
}
}
}
// This handler is called whenever an XML tag closes.
//
void rss_end_element(void *data, const char *el)
{
struct rssparser *r = (struct rssparser *)data;
if ( // end of a new item(rss) or entry(atom)
(!strcasecmp(el, "entry"))
|| (!strcasecmp(el, "item"))
) {
if (r->msg != NULL) { // Save the message to the rooms
// use the link as an item id if nothing else is available
if ((r->item_id == NULL) && (r->link != NULL)) {
r->item_id = strdup(r->link);
}
// check the use table
StrBuf *u = NewStrBuf();
StrBufAppendPrintf(u, "rss/%s", r->item_id);
int already_seen = CheckIfAlreadySeen(u);
FreeStrBuf(&u);
if (already_seen == 0) {
// Compose the message text
StrBuf *TheMessage = NewStrBuf();
StrBufAppendPrintf(TheMessage,
"Content-type: text/html\n\n"
"\n\n"
"<html><head></head><body>"
);
if (r->description != NULL) {
StrBufAppendPrintf(TheMessage, "%s<br><br>\r\n", r->description);
free(r->description);
r->description = NULL;
}
if (r->link != NULL) {
StrBufAppendPrintf(TheMessage, "<a href=\"%s\">%s</a>\r\n", r->link, r->link);
free(r->link);
r->link = NULL;
}
StrBufAppendPrintf(TheMessage, "</body></html>\r\n");
CM_SetField(r->msg, eMesageText, ChrPtr(TheMessage), StrLength(TheMessage));
FreeStrBuf(&TheMessage);
if (CM_IsEmpty(r->msg, eAuthor)) {
CM_SetField(r->msg, eAuthor, HKEY("rss"));
}
if (CM_IsEmpty(r->msg, eTimestamp)) {
CM_SetFieldLONG(r->msg, eTimestamp, time(NULL));
}
// Save it to the room(s)
struct rssroom *rr = NULL;
long msgnum = (-1);
for (rr=r->rooms; rr!=NULL; rr=rr->next) {
if (rr == r->rooms) {
msgnum = CtdlSubmitMsg(r->msg, NULL, rr->room, 0);
}
else {
CtdlSaveMsgPointerInRoom(rr->room, msgnum, 0, NULL);
}
syslog(LOG_DEBUG, "rssclient: saved message %ld to %s", msgnum, rr->room);
}
}
else {
syslog(LOG_DEBUG, "rssclient: already seen %s", r->item_id);
}
CM_Free(r->msg);
r->msg = NULL;
}
if (r->item_id != NULL) {
free(r->item_id);
r->item_id = NULL;
}
}
else if (!strcasecmp(el, "title")) { // item subject (rss and atom)
if ((r->msg != NULL) && (CM_IsEmpty(r->msg, eMsgSubject))) {
CM_SetField(r->msg, eMsgSubject, ChrPtr(r->CData), StrLength(r->CData));
striplt(r->msg->cm_fields[eMsgSubject]);
}
}
else if (!strcasecmp(el, "author")) { // author of item (rss and maybe atom)
if ((r->msg != NULL) && (CM_IsEmpty(r->msg, eAuthor))) {
CM_SetField(r->msg, eAuthor, ChrPtr(r->CData), StrLength(r->CData));
striplt(r->msg->cm_fields[eAuthor]);
}
}
else if (!strcasecmp(el, "pubdate")) { // date/time stamp (rss) Sat, 25 Feb 2017 14:28:01 EST
if ((r->msg)&&(r->msg->cm_fields[eTimestamp]==NULL)) {
CM_SetFieldLONG(r->msg, eTimestamp, parsedate(ChrPtr(r->CData)));
}
}
else if (!strcasecmp(el, "updated")) { // date/time stamp (atom) 2003-12-13T18:30:02Z
if ((r->msg)&&(r->msg->cm_fields[eTimestamp]==NULL)) {
struct tm t;
char zulu;
memset(&t, 0, sizeof t);
sscanf(ChrPtr(r->CData), "%d-%d-%dT%d:%d:%d%c", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec, &zulu);
t.tm_year -= 1900;
t.tm_mon -= 1;
CM_SetFieldLONG(r->msg, eTimestamp, mktime(&t));
}
}
else if (!strcasecmp(el, "link")) { // link to story (rss)
if (r->link != NULL) {
free(r->link);
r->link = NULL;
}
r->link = strdup(ChrPtr(r->CData));
striplt(r->link);
}
else if (
(!strcasecmp(el, "guid")) // unique item id (rss)
|| (!strcasecmp(el, "id")) // unique item id (atom)
) {
if (r->item_id != NULL) {
free(r->item_id);
r->item_id = NULL;
}
r->item_id = strdup(ChrPtr(r->CData));
striplt(r->item_id);
}
else if (
(!strcasecmp(el, "description")) // message text (rss)
|| (!strcasecmp(el, "summary")) // message text (atom)
|| (!strcasecmp(el, "content")) // message text (atom)
) {
if (r->description != NULL) {
free(r->description);
r->description = NULL;
}
r->description = strdup(ChrPtr(r->CData));
striplt(r->description);
}
if (r->CData != NULL) {
FreeStrBuf(&r->CData);
r->CData = NULL;
}
}
// This handler is called whenever data appears between opening and closing tags.
//
void rss_handle_data(void *data, const char *content, int length)
{
struct rssparser *r = (struct rssparser *)data;
if (r->CData == NULL) {
r->CData = NewStrBuf();
}
StrBufAppendBufPlain(r->CData, content, length, 0);
}
// Feed has been downloaded, now parse it.
//
void rss_parse_feed(StrBuf *Feed, struct rssroom *rooms)
{
struct rssparser r;
memset(&r, 0, sizeof r);
r.rooms = rooms;
XML_Parser p = XML_ParserCreate("UTF-8");
XML_SetElementHandler(p, rss_start_element, rss_end_element);
XML_SetCharacterDataHandler(p, rss_handle_data);
XML_SetUserData(p, (void *)&r);
XML_Parse(p, ChrPtr(Feed), StrLength(Feed), XML_TRUE);
XML_ParserFree(p);
}
// Add a feed/room pair into the todo list
//
void rssclient_push_todo(char *rssurl, char *roomname)
{
struct rssurl *r = NULL;
struct rssurl *thisone = NULL;
struct rssroom *newroom = NULL;
syslog(LOG_DEBUG, "rssclient: will fetch %s to %s", rssurl, roomname);
for (r=rsstodo; r!=NULL; r=r->next) {
if (!strcasecmp(r->url, rssurl)) {
thisone = r;
}
}
if (thisone == NULL) {
thisone = malloc(sizeof(struct rssurl));
thisone->url = strdup(rssurl);
thisone->rooms = NULL;
thisone->next = rsstodo;
rsstodo = thisone;
}
newroom = malloc(sizeof(struct rssroom));
newroom->room = strdup(roomname);
newroom->next = thisone->rooms;
thisone->rooms = newroom;
}
// pull one feed (possibly multiple rooms)
//
void rss_pull_one_feed(struct rssurl *url)
{
CURL *curl;
CURLcode res;
StrBuf *Downloaded = NULL;
syslog(LOG_DEBUG, "rssclient: fetching %s", url->url);
curl = curl_easy_init();
if (!curl) {
return;
}
Downloaded = NewStrBuf();
curl_easy_setopt(curl, CURLOPT_URL, url->url);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); // Follow redirects
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback); // What to do with downloaded data
curl_easy_setopt(curl, CURLOPT_WRITEDATA, Downloaded); // Give it our StrBuf to work with
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L); // Time out after 20 seconds
res = curl_easy_perform(curl); // Perform the request
if (res != CURLE_OK) {
syslog(LOG_WARNING, "rssclient: failed to load feed: %s", curl_easy_strerror(res));
}
curl_easy_cleanup(curl);
rss_parse_feed(Downloaded, url->rooms); // parse the feed
FreeStrBuf(&Downloaded); // free the downloaded feed data
}
// We have a list, now download the feeds
//
void rss_pull_feeds(void)
{
struct rssurl *r;
struct rssroom *rr;
while (rsstodo != NULL) {
rss_pull_one_feed(rsstodo);
r = rsstodo;
rsstodo = rsstodo->next;
while (r->rooms != NULL) {
rr = r->rooms;
r->rooms = r->rooms->next;
free(rr->room);
free(rr);
}
free(r->url);
free(r);
}
}
// Scan a room's netconfig looking for RSS feed parsing requests
//
void rssclient_scan_room(struct ctdlroom *qrbuf, void *data)
{
char *serialized_config = NULL;
int num_configs = 0;
char cfgline[SIZ];
int i = 0;
serialized_config = LoadRoomNetConfigFile(qrbuf->QRnumber);
if (!serialized_config) {
return;
}
num_configs = num_tokens(serialized_config, '\n');
for (i=0; i<num_configs; ++i) {
extract_token(cfgline, serialized_config, i, '\n', sizeof cfgline);
if (!strncasecmp(cfgline, HKEY("rssclient|"))) {
strcpy(cfgline, &cfgline[10]);
char *vbar = strchr(cfgline, '|');
if (vbar != NULL) {
*vbar = 0;
}
rssclient_push_todo(cfgline, qrbuf->QRname);
}
}
free(serialized_config);
}
/*
* Scan for rooms that have RSS client requests configured
*/
void rssclient_scan(void) {
time_t now = time(NULL);
/* Run no more than once every 15 minutes. */
if ((now - last_run) < 900) {
syslog(LOG_DEBUG,
"rssclient: polling interval not yet reached; last run was %ldm%lds ago",
((now - last_run) / 60),
((now - last_run) % 60)
);
return;
}
become_session(&rss_CC);
syslog(LOG_DEBUG, "rssclient: started");
CtdlForEachRoom(rssclient_scan_room, NULL);
rss_pull_feeds();
syslog(LOG_DEBUG, "rssclient: ended");
last_run = time(NULL);
return;
}
CTDL_MODULE_INIT(rssclient)
{
if (!threading)
{
syslog(LOG_INFO, "rssclient: using %s", curl_version());
CtdlRegisterSessionHook(rssclient_scan, EVT_TIMER, PRIO_AGGR + 300);
}
else
{
CtdlFillSystemContext(&rss_CC, "rssclient");
}
return "rssclient";
}
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