--- /dev/null
+/*
+ * $Id: serv_rssclient.c 5652 2007-10-29 20:14:48Z ajc $
+ *
+ * Bring external RSS feeds into rooms.
+ *
+ */
+
+#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 "citadel.h"
+#include "server.h"
+#include "citserver.h"
+#include "support.h"
+#include "config.h"
+#include "tools.h"
+#include "room_ops.h"
+#include "ctdl_module.h"
+#include "clientsocket.h"
+#include "msgbase.h"
+#include "database.h"
+#include "citadel_dirs.h"
+#include "md5.h"
+
+#ifdef HAVE_EXPAT
+#include <expat.h>
+
+
+struct rssnetcfg {
+ struct rssnetcfg *next;
+ char url[256];
+ char *rooms;
+};
+
+struct rss_item {
+ char *chardata;
+ int chardata_len;
+ char *roomlist;
+ int done_parsing;
+ char *guid;
+ char *title;
+ char *link;
+ char *description;
+ time_t pubdate;
+};
+
+struct rssnetcfg *rnclist = NULL;
+
+
+/*
+ * Commit a fetched and parsed RSS item to disk
+ */
+void rss_save_item(struct rss_item *ri) {
+
+ struct MD5Context md5context;
+ u_char rawdigest[MD5_DIGEST_LEN];
+ int i;
+ char utmsgid[SIZ];
+ struct cdbdata *cdbut;
+ struct UseTable ut;
+ struct CtdlMessage *msg;
+ struct recptypes *recp = NULL;
+ int msglen = 0;
+
+ recp = (struct recptypes *) malloc(sizeof(struct recptypes));
+ if (recp == NULL) return;
+ memset(recp, 0, sizeof(struct recptypes));
+ recp->recp_room = strdup(ri->roomlist);
+ recp->num_room = num_tokens(ri->roomlist, '|');
+ recp->recptypes_magic = RECPTYPES_MAGIC;
+
+ /* Construct a GUID to use in the S_USETABLE table.
+ * If one is not present in the item itself, make one up.
+ */
+ if (ri->guid != NULL) {
+ snprintf(utmsgid, sizeof utmsgid, "rss/%s", ri->guid);
+ }
+ else {
+ MD5Init(&md5context);
+ if (ri->title != NULL) {
+ MD5Update(&md5context, ri->title, strlen(ri->title));
+ }
+ if (ri->link != NULL) {
+ MD5Update(&md5context, ri->link, strlen(ri->link));
+ }
+ MD5Final(rawdigest, &md5context);
+ for (i=0; i<MD5_DIGEST_LEN; i++) {
+ sprintf(&utmsgid[i*2], "%02X", (unsigned char) (rawdigest[i] & 0xff));
+ utmsgid[i*2] = tolower(utmsgid[i*2]);
+ utmsgid[(i*2)+1] = tolower(utmsgid[(i*2)+1]);
+ }
+ strcat(utmsgid, "_rss2ctdl");
+ }
+
+ /* Find out if we've already seen this item */
+ cdbut = cdb_fetch(CDB_USETABLE, utmsgid, strlen(utmsgid));
+ if (cdbut != NULL) {
+ /* Item has already been seen */
+ lprintf(CTDL_DEBUG, "%s has already been seen\n", utmsgid);
+ cdb_free(cdbut);
+
+ /* rewrite the record anyway, to update the timestamp */
+ strcpy(ut.ut_msgid, utmsgid);
+ ut.ut_timestamp = time(NULL);
+ cdb_store(CDB_USETABLE, utmsgid, strlen(utmsgid), &ut, sizeof(struct UseTable) );
+ }
+ else {
+ /* Item has not been seen, so save it. */
+
+ for (i=strlen(ri->description); i>=0; --i) {
+ if (isspace(ri->description[i])) {
+ ri->description[i] = ' ';
+ }
+ }
+
+ msg = malloc(sizeof(struct CtdlMessage));
+ memset(msg, 0, sizeof(struct CtdlMessage));
+ msg->cm_magic = CTDLMESSAGE_MAGIC;
+ msg->cm_anon_type = MES_NORMAL;
+ msg->cm_format_type = FMT_RFC822;
+ msg->cm_fields['A'] = strdup("rss");
+ msg->cm_fields['N'] = strdup(NODENAME);
+ msg->cm_fields['U'] = strdup(ri->title);
+ msg->cm_fields['T'] = malloc(64);
+ snprintf(msg->cm_fields['T'], 64, "%ld", ri->pubdate);
+
+ msglen = 1024 + strlen(ri->link) + strlen(ri->description) ;
+ msg->cm_fields['M'] = malloc(msglen);
+ snprintf(msg->cm_fields['M'], msglen,
+ "Content-type: text/html\r\n\r\n"
+ "<html><body>\n"
+ "%s<br><br>\n"
+ "<a href=\"%s\">%s</a>\n"
+ "</body></html>\n"
+ ,
+ ri->description,
+ ri->link, ri->link
+ );
+
+ CtdlSubmitMsg(msg, recp, NULL);
+ CtdlFreeMessage(msg);
+ free_recipients(recp);
+
+ /* write the uidl to the use table so we don't store this item again */
+ strcpy(ut.ut_msgid, utmsgid);
+ ut.ut_timestamp = time(NULL);
+ cdb_store(CDB_USETABLE, utmsgid, strlen(utmsgid), &ut, sizeof(struct UseTable) );
+ }
+}
+
+
+
+/*
+ * Convert an RDF/RSS datestamp into a time_t
+ */
+time_t rdf_parsedate(char *p)
+{
+ struct tm tm;
+
+ if (!p) return 0L;
+ if (strlen(p) < 10) return 0L;
+
+ memset(&tm, 0, sizeof tm);
+
+ /* YYYY-MM-DDTHH:MM format...
+ */
+ if ( (p[4] == '-') && (p[7] == '-') ) {
+ tm.tm_year = atoi(&p[0]) - 1900;
+ tm.tm_mon = atoi(&p[5]) - 1;
+ tm.tm_mday = atoi(&p[8]);
+ if ( (p[10] == 'T') && (p[13] == ':') ) {
+ tm.tm_hour = atoi(&p[11]);
+ tm.tm_min = atoi(&p[14]);
+ }
+ }
+
+ else {
+ /* FIXME try an imap timestamp conversion */
+ }
+
+ return mktime(&tm);
+}
+
+
+
+void rss_xml_start(void *data, const char *el, const char **attr) {
+ struct rss_item *ri = (struct rss_item *) data;
+
+ if (!strcasecmp(el, "item")) {
+
+ /* Initialize the feed item data structure */
+ if (ri->guid != NULL) free(ri->guid);
+ ri->guid = NULL;
+ if (ri->title != NULL) free(ri->title);
+ ri->title = NULL;
+ if (ri->link != NULL) free(ri->link);
+ ri->link = NULL;
+ if (ri->description != NULL) free(ri->description);
+ ri->description = NULL;
+
+ /* Throw away any existing character data */
+ if (ri->chardata_len > 0) {
+ free(ri->chardata);
+ ri->chardata = 0;
+ ri->chardata_len = 0;
+ }
+ }
+
+
+
+}
+
+void rss_xml_end(void *data, const char *supplied_el) {
+ struct rss_item *ri = (struct rss_item *) data;
+ char el[256];
+ char *sep = NULL;
+
+
+ /* Axe the namespace, we don't care about it */
+
+ safestrncpy(el, supplied_el, sizeof el);
+ while (sep = strchr(el, ':'), sep) {
+ strcpy(el, ++sep);
+ }
+
+ if (!strcasecmp(el, "guid")) {
+ if (ri->guid != NULL) free(ri->guid);
+ striplt(ri->chardata);
+ ri->guid = strdup(ri->chardata);
+ }
+
+ if (!strcasecmp(el, "title")) {
+ if (ri->title != NULL) free(ri->title);
+ striplt(ri->chardata);
+ ri->title = strdup(ri->chardata);
+ }
+
+ if (!strcasecmp(el, "link")) {
+ if (ri->link != NULL) free(ri->link);
+ striplt(ri->chardata);
+ ri->link = strdup(ri->chardata);
+ }
+
+ if (!strcasecmp(el, "description")) {
+ if (ri->description != NULL) free(ri->description);
+ ri->description = strdup(ri->chardata);
+ }
+
+ if ( (!strcasecmp(el, "pubdate")) || (!strcasecmp(el, "date")) ) {
+ striplt(ri->chardata);
+ ri->pubdate = rdf_parsedate(ri->chardata);
+ }
+
+ if (!strcasecmp(el, "item")) {
+ rss_save_item(ri);
+ }
+
+ if ( (!strcasecmp(el, "rss")) || (!strcasecmp(el, "rdf")) ) {
+ lprintf(CTDL_DEBUG, "KILL THE PARSER, KILL THE PARSER, KILL THE PARSER!\n");
+ ri->done_parsing = 1;
+ }
+
+ if (ri->chardata_len > 0) {
+ free(ri->chardata);
+ ri->chardata = 0;
+ ri->chardata_len = 0;
+ }
+
+}
+
+
+/*
+ * This callback stores up the data which appears in between tags.
+ */
+void rss_xml_chardata(void *data, const XML_Char *s, int len) {
+ struct rss_item *ri = (struct rss_item *) data;
+ int old_len;
+ int new_len;
+ char *new_buffer;
+
+ old_len = ri->chardata_len;
+ new_len = old_len + len;
+ new_buffer = realloc(ri->chardata, new_len + 1);
+ if (new_buffer != NULL) {
+ memcpy(&new_buffer[old_len], s, len);
+ new_buffer[new_len] = 0;
+ ri->chardata = new_buffer;
+ ri->chardata_len = new_len;
+ }
+}
+
+
+
+/*
+ * Parses an url into hostname, port number and resource identifier.
+ */
+int parse_url(char *url, char *hostname, int *port, char *identifier)
+{
+ char protocol[1024], scratch[1024];
+ char *ptr = NULL;
+ char *nptr = NULL;
+
+ strcpy(scratch, url);
+ ptr = (char *)strchr(scratch, ':');
+ if (!ptr) {
+ return(1); /* no protocol specified */
+ }
+ strcpy(ptr, "");
+ strcpy(protocol, scratch);
+ if (strcmp(protocol, "http")) {
+ return(2); /* not HTTP */
+ }
+
+ strcpy(scratch, url);
+ ptr = (char *) strstr(scratch, "//");
+ if (!ptr) {
+ return(3); /* no server specified */
+ }
+ ptr += 2;
+
+ strcpy(hostname, ptr);
+ nptr = (char *)strchr(ptr, ':');
+ if (!nptr) {
+ *port = 80; /* default */
+ nptr = (char *)strchr(hostname, '/');
+ }
+ else {
+ sscanf(nptr, ":%d", port);
+ nptr = (char *)strchr(hostname, ':');
+ }
+
+ if (nptr) {
+ *nptr = '\0';
+ }
+
+ nptr = (char *)strchr(ptr, '/');
+
+ if (!nptr) {
+ return(4); /* no url specified */
+ }
+
+ strcpy(identifier, nptr);
+ return(0);
+}
+
+
+
+
+
+
+/*
+ * Begin a feed parse
+ */
+void rss_do_fetching(char *url, char *rooms) {
+ char buf[1024];
+ char rsshost[1024];
+ int rssport = 80;
+ char rssurl[1024];
+ struct rss_item ri;
+ XML_Parser xp;
+ int sock = (-1);
+ int got_bytes = (-1);
+
+
+ xp = XML_ParserCreateNS("UTF-8", ':');
+ if (!xp) {
+ lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
+ return;
+ }
+
+ memset(&ri, 0, sizeof(struct rss_item));
+ ri.roomlist = rooms;
+ XML_SetElementHandler(xp, rss_xml_start, rss_xml_end);
+ XML_SetCharacterDataHandler(xp, rss_xml_chardata);
+ XML_SetUserData(xp, &ri);
+
+ /* Parse the URL */
+
+retry: sock = (-1);
+ if (parse_url(url, rsshost, &rssport, rssurl) != 0) {
+ lprintf(CTDL_ALERT, "Invalid URL: %s\n", url);
+ }
+ else {
+ lprintf(CTDL_NOTICE, "Connecting to <%s>\n", rsshost);
+ sprintf(buf, "%d", rssport);
+ sock = sock_connect(rsshost, buf, "tcp");
+ }
+
+ if (sock >= 0) {
+ lprintf(CTDL_DEBUG, "Connected!\n");
+
+ snprintf(buf, sizeof buf, "GET %s HTTP/1.0\r", rssurl);
+ lprintf(CTDL_DEBUG, "<%s\n", buf);
+ sock_puts(sock, buf);
+
+ snprintf(buf, sizeof buf, "Server: %s\r", rsshost);
+ lprintf(CTDL_DEBUG, "<%s\n", buf);
+ sock_puts(sock, buf);
+
+ sock_puts(sock, "\r");
+
+ if (sock_getln(sock, buf, sizeof buf) >= 0) {
+ lprintf(CTDL_DEBUG, ">%s\n", buf);
+ remove_token(buf, 0, ' ');
+ if (buf[0] == '2') {
+
+ while (got_bytes = sock_getln(sock, buf, sizeof buf),
+ (got_bytes >= 0 && (strcmp(buf, "")) && (strcmp(buf, "\r"))) ) {
+ /* FIXME handle 302 redirects!! */
+ }
+
+
+ while (got_bytes = sock_read(sock, buf, sizeof buf, 0),
+ ((got_bytes>=0) && (ri.done_parsing == 0)) ) {
+ XML_Parse(xp, buf, got_bytes, 0);
+ }
+ if (ri.done_parsing == 0) XML_Parse(xp, "", 0, 1);
+ }
+ }
+ sock_close(sock);
+ }
+ else {
+ lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
+ }
+
+ XML_ParserFree(xp);
+
+ /* Free the feed item data structure */
+ if (ri.guid != NULL) free(ri.guid);
+ ri.guid = NULL;
+ if (ri.title != NULL) free(ri.title);
+ ri.title = NULL;
+ if (ri.link != NULL) free(ri.link);
+ ri.link = NULL;
+ if (ri.description != NULL) free(ri.description);
+ ri.description = NULL;
+ if (ri.chardata_len > 0) {
+ free(ri.chardata);
+ ri.chardata = 0;
+ ri.chardata_len = 0;
+ }
+}
+
+
+/*
+ * Scan a room's netconfig to determine whether it is requesting any RSS feeds
+ */
+void rssclient_scan_room(struct ctdlroom *qrbuf, void *data)
+{
+ char filename[PATH_MAX];
+ char buf[1024];
+ char instr[32];
+ FILE *fp;
+ char feedurl[256];
+ struct rssnetcfg *rncptr = NULL;
+ struct rssnetcfg *use_this_rncptr = NULL;
+ int len = 0;
+ char *ptr = NULL;
+
+ assoc_file_name(filename, sizeof filename, qrbuf, ctdl_netcfg_dir);
+
+ /* Only do net processing for rooms that have netconfigs */
+ fp = fopen(filename, "r");
+ if (fp == NULL) {
+ return;
+ }
+
+ while (fgets(buf, sizeof buf, fp) != NULL) {
+ buf[strlen(buf)-1] = 0;
+
+ extract_token(instr, buf, 0, '|', sizeof instr);
+ if (!strcasecmp(instr, "rssclient")) {
+ extract_token(feedurl, buf, 1, '|', sizeof feedurl);
+
+ /* If any other rooms have requested the same feed, then we will just add this
+ * room to the target list for that client request.
+ */
+ for (rncptr=rnclist; rncptr!=NULL; rncptr=rncptr->next) {
+ if (!strcmp(rncptr->url, feedurl)) {
+ use_this_rncptr = rncptr;
+ }
+ }
+
+ /* Otherwise create a new client request */
+ if (use_this_rncptr == NULL) {
+ rncptr = (struct rssnetcfg *) malloc(sizeof(struct rssnetcfg));
+ if (rncptr != NULL) {
+ rncptr->next = rnclist;
+ safestrncpy(rncptr->url, feedurl, sizeof rncptr->url);
+ rncptr->rooms = NULL;
+ rnclist = rncptr;
+ use_this_rncptr = rncptr;
+ }
+ }
+
+ /* Add the room name to the request */
+ if (use_this_rncptr != NULL) {
+ if (use_this_rncptr->rooms == NULL) {
+ rncptr->rooms = strdup(qrbuf->QRname);
+ }
+ else {
+ len = strlen(use_this_rncptr->rooms) + strlen(qrbuf->QRname) + 5;
+ ptr = realloc(use_this_rncptr->rooms, len);
+ if (ptr != NULL) {
+ strcat(ptr, "|");
+ strcat(ptr, qrbuf->QRname);
+ use_this_rncptr->rooms = ptr;
+ }
+ }
+ }
+ }
+
+ }
+
+ fclose(fp);
+
+}
+
+/*
+ * Scan for rooms that have RSS client requests configured
+ */
+void rssclient_scan(void) {
+ static time_t last_run = 0L;
+ static int doing_rssclient = 0;
+ struct rssnetcfg *rptr = NULL;
+
+ /*
+ * Run RSS client no more frequently than once every n seconds
+ */
+ if ( (time(NULL) - last_run) < config.c_net_freq ) {
+ return;
+ }
+
+ /*
+ * This is a simple concurrency check to make sure only one rssclient run
+ * is done at a time. We could do this with a mutex, but since we
+ * don't really require extremely fine granularity here, we'll do it
+ * with a static variable instead.
+ */
+ if (doing_rssclient) return;
+ doing_rssclient = 1;
+
+ lprintf(CTDL_DEBUG, "rssclient started\n");
+ ForEachRoom(rssclient_scan_room, NULL);
+
+ while (rnclist != NULL) {
+ rss_do_fetching(rnclist->url, rnclist->rooms);
+ rptr = rnclist;
+ rnclist = rnclist->next;
+ if (rptr->rooms != NULL) free(rptr->rooms);
+ free(rptr);
+ }
+
+ lprintf(CTDL_DEBUG, "rssclient ended\n");
+ last_run = time(NULL);
+ doing_rssclient = 0;
+}
+
+
+#endif /* HAVE_EXPAT */
+
+CTDL_MODULE_INIT(rssclient)
+{
+#ifdef HAVE_EXPAT
+ CtdlRegisterSessionHook(rssclient_scan, EVT_TIMER);
+#else
+ lprintf(CTDL_INFO, "This server is missing the Expat XML parser. RSS client will be disabled.\n");
+#endif
+ /* return our Subversion id for the Log */
+ return "$Id: serv_rssclient.c 5652 2007-10-29 20:14:48Z ajc $";
+}
projects / citadel.git / commitdiff