source: protocols/jabber/conference.c @ af09afd

/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Jabber module - Conference rooms                                         *
*                                                                           *
*  Copyright 2007-2012 Wilmer van der Gaast <wilmer@gaast.net>              *
*                                                                           *
*  This program is free software; you can redistribute it and/or modify     *
*  it under the terms of the GNU General Public License as published by     *
*  the Free Software Foundation; either version 2 of the License, or        *
*  (at your option) any later version.                                      *
*                                                                           *
*  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.                             *
*                                                                           *
*  You should have received a copy of the GNU General Public License along  *
*  with this program; if not, write to the Free Software Foundation, Inc.,  *
*  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.              *
*                                                                           *
\***************************************************************************/

#include "jabber.h"

static xt_status jabber_chat_join_failed(struct im_connection *ic, struct xt_node *node, struct xt_node *orig);
static xt_status jabber_chat_self_message(struct im_connection *ic, struct xt_node *node, struct xt_node *orig);

struct groupchat *jabber_chat_join(struct im_connection *ic, const char *room, const char *nick, const char *password,
                                   gboolean always_use_nicks)
{
        struct jabber_chat *jc;
        struct xt_node *node;
        struct groupchat *c;
        char *roomjid;

        roomjid = g_strdup_printf("%s/%s", room, nick);
        node = xt_new_node("x", NULL, NULL);
        xt_add_attr(node, "xmlns", XMLNS_MUC);
        if (password) {
                xt_add_child(node, xt_new_node("password", password, NULL));
        }
        node = jabber_make_packet("presence", NULL, roomjid, node);
        jabber_cache_add(ic, node, jabber_chat_join_failed);

        if (!jabber_write_packet(ic, node)) {
                g_free(roomjid);
                return NULL;
        }

        jc = g_new0(struct jabber_chat, 1);
        jc->name = jabber_normalize(room);

        if ((jc->me = jabber_buddy_add(ic, roomjid)) == NULL) {
                g_free(roomjid);
                g_free(jc->name);
                g_free(jc);
                return NULL;
        }

        if (always_use_nicks) {
                jc->flags = JCFLAG_ALWAYS_USE_NICKS;
        }

        /* roomjid isn't normalized yet, and we need an original version
           of the nick to send a proper presence update. */
        jc->my_full_jid = roomjid;

        c = imcb_chat_new(ic, room);
        c->data = jc;

        return c;
}

struct groupchat *jabber_chat_with(struct im_connection *ic, char *who)
{
        struct jabber_data *jd = ic->proto_data;
        struct jabber_chat *jc;
        struct groupchat *c;
        GChecksum *sum;
        double now = gettime();
        char *uuid, *rjid, *cserv;

        sum = g_checksum_new(G_CHECKSUM_SHA1);
        g_checksum_update(sum, (uint8_t *) ic->acc->user, strlen(ic->acc->user));
        g_checksum_update(sum, (uint8_t *) &now, sizeof(now));
        g_checksum_update(sum, (uint8_t *) who, strlen(who));
        uuid = sha1_random_uuid(sum);

        if (jd->flags & JFLAG_GTALK) {
                cserv = g_strdup("groupchat.google.com");
        } else {
                /* Guess... */
                cserv = g_strdup_printf("conference.%s", jd->server);
        }

        rjid = g_strdup_printf("private-chat-%s@%s", uuid, cserv);
        g_free(uuid);
        g_free(cserv);

        c = jabber_chat_join(ic, rjid, jd->username, NULL, FALSE);
        g_free(rjid);
        if (c == NULL) {
                return NULL;
        }

        jc = c->data;
        jc->invite = g_strdup(who);

        return c;
}

static xt_status jabber_chat_join_failed(struct im_connection *ic, struct xt_node *node, struct xt_node *orig)
{
        struct jabber_error *err;
        struct jabber_buddy *bud;
        char *room;

        room = xt_find_attr(orig, "to");
        bud = jabber_buddy_by_jid(ic, room, 0);
        err = jabber_error_parse(xt_find_node(node->children, "error"), XMLNS_STANZA_ERROR);
        if (err) {
                imcb_error(ic, "Error joining groupchat %s: %s%s%s", room, err->code,
                           err->text ? ": " : "", err->text ? err->text : "");
                jabber_error_free(err);
        }
        if (bud) {
                struct groupchat *c = jabber_chat_by_jid(ic, bud->bare_jid);
                if (c) {
                        jabber_chat_free(c);
                }
        }

        return XT_HANDLED;
}

static xt_status jabber_chat_self_message(struct im_connection *ic, struct xt_node *node, struct xt_node *orig)
{
        /* This is a self message sent by this bitlbee - just drop it */
        return XT_ABORT;
}

struct groupchat *jabber_chat_by_jid(struct im_connection *ic, const char *name)
{
        char *normalized = jabber_normalize(name);
        GSList *l;
        struct groupchat *ret;
        struct jabber_chat *jc;

        for (l = ic->groupchats; l; l = l->next) {
                ret = l->data;
                jc = ret->data;
                if (strcmp(normalized, jc->name) == 0) {
                        break;
                }
        }
        g_free(normalized);

        return l ? ret : NULL;
}

void jabber_chat_free(struct groupchat *c)
{
        struct jabber_chat *jc = c->data;

        jabber_buddy_remove_bare(c->ic, jc->name);

        g_free(jc->last_sent_message);
        g_free(jc->my_full_jid);
        g_free(jc->name);
        g_free(jc->invite);
        g_free(jc);

        imcb_chat_free(c);
}

int jabber_chat_msg(struct groupchat *c, char *message, int flags)
{
        struct im_connection *ic = c->ic;
        struct jabber_chat *jc = c->data;
        struct xt_node *node;

        jc->flags |= JCFLAG_MESSAGE_SENT;

        node = xt_new_node("body", message, NULL);
        node = jabber_make_packet("message", "groupchat", jc->name, node);

        jabber_cache_add(ic, node, jabber_chat_self_message);

        g_free(jc->last_sent_message);
        jc->last_sent_message = g_strdup(message);

        return !jabber_write_packet(ic, node);
}

int jabber_chat_topic(struct groupchat *c, char *topic)
{
        struct im_connection *ic = c->ic;
        struct jabber_chat *jc = c->data;
        struct xt_node *node;

        node = xt_new_node("subject", topic, NULL);
        node = jabber_make_packet("message", "groupchat", jc->name, node);

        if (!jabber_write_packet(ic, node)) {
                xt_free_node(node);
                return 0;
        }
        xt_free_node(node);

        return 1;
}

int jabber_chat_leave(struct groupchat *c, const char *reason)
{
        struct im_connection *ic = c->ic;
        struct jabber_chat *jc = c->data;
        struct xt_node *node;

        node = xt_new_node("x", NULL, NULL);
        xt_add_attr(node, "xmlns", XMLNS_MUC);
        node = jabber_make_packet("presence", "unavailable", jc->my_full_jid, node);

        if (!jabber_write_packet(ic, node)) {
                xt_free_node(node);
                return 0;
        }
        xt_free_node(node);

        return 1;
}

void jabber_chat_invite(struct groupchat *c, char *who, char *message)
{
        struct xt_node *node;
        struct im_connection *ic = c->ic;
        struct jabber_chat *jc = c->data;

        node = xt_new_node("reason", message, NULL);

        node = xt_new_node("invite", NULL, node);
        xt_add_attr(node, "to", who);

        node = xt_new_node("x", NULL, node);
        xt_add_attr(node, "xmlns", XMLNS_MUC_USER);

        node = jabber_make_packet("message", NULL, jc->name, node);

        jabber_write_packet(ic, node);

        xt_free_node(node);
}

static int jabber_chat_has_other_resources(struct im_connection *ic, struct jabber_buddy *bud)
{
        struct jabber_buddy *cur;

        for (cur = jabber_buddy_by_jid(ic, bud->bare_jid, GET_BUDDY_FIRST); cur; cur = cur->next) {
                if (cur != bud && jabber_compare_jid(cur->ext_jid, bud->ext_jid)) {
                        return TRUE;
                }
        }
        
        return FALSE;
}

/* Not really the same syntax as the normal pkt_ functions, but this isn't
   called by the xmltree parser directly and this way I can add some extra
   parameters so we won't have to repeat too many things done by the caller
   already. */
void jabber_chat_pkt_presence(struct im_connection *ic, struct jabber_buddy *bud, struct xt_node *node)
{
        struct groupchat *chat;
        struct xt_node *c;
        char *type = xt_find_attr(node, "type");
        struct jabber_data *jd = ic->proto_data;
        struct jabber_chat *jc;
        char *s;

        if ((chat = jabber_chat_by_jid(ic, bud->bare_jid)) == NULL) {
                /* How could this happen?? We could do kill( self, 11 )
                   now or just wait for the OS to do it. :-) */
                return;
        }

        jc = chat->data;

        if (type == NULL && !(bud->flags & JBFLAG_IS_CHATROOM)) {
                bud->flags |= JBFLAG_IS_CHATROOM;
                /* If this one wasn't set yet, this buddy just joined the chat.
                   Slightly hackish way of finding out eh? ;-) */

                /* This is pretty messy... Here it sets ext_jid to the real
                   JID of the participant. Works for non-anonymized channels.
                   Might break if someone joins a chat twice, though. */
                for (c = node->children; (c = xt_find_node(c, "x")); c = c->next) {
                        if ((s = xt_find_attr(c, "xmlns")) &&
                            (strcmp(s, XMLNS_MUC_USER) == 0)) {
                                struct xt_node *item;

                                item = xt_find_node(c->children, "item");
                                if ((s = xt_find_attr(item, "jid"))) {
                                        /* Yay, found what we need. :-) */
                                        bud->ext_jid = jabber_normalize(s);
                                        break;
                                }
                        }
                }

                /* Make up some other handle, if necessary. */
                if (bud->ext_jid == NULL) {
                        if (bud == jc->me) {
                                bud->ext_jid = g_strdup(jd->me);
                        } else {
                                int i;

                                /* Don't want the nick to be at the end, so let's
                                   think of some slightly different notation to use
                                   for anonymous groupchat participants in BitlBee. */
                                bud->ext_jid = g_strdup_printf("%s=%s", bud->resource, bud->bare_jid);

                                /* And strip any unwanted characters. */
                                for (i = 0; bud->resource[i]; i++) {
                                        if (bud->ext_jid[i] == '=' || bud->ext_jid[i] == '@') {
                                                bud->ext_jid[i] = '_';
                                        }
                                }
                        }
                        bud->flags |= JBFLAG_IS_ANONYMOUS;
                } else if (bud == jc->me) {
                        g_free(bud->ext_jid);
                        bud->ext_jid = g_strdup(jd->me);
                }

                if (bud != jc->me && bud->flags & JBFLAG_IS_ANONYMOUS) {
                        /* If JIDs are anonymized, add them to the local
                           list for the duration of this chat. */
                        imcb_add_buddy(ic, bud->ext_jid, NULL);
                        imcb_buddy_nick_hint(ic, bud->ext_jid, bud->resource);
                }

                if (bud == jc->me && jc->invite != NULL) {
                        char *msg = g_strdup_printf("Please join me in room %s", jc->name);
                        jabber_chat_invite(chat, jc->invite, msg);
                        g_free(jc->invite);
                        g_free(msg);
                        jc->invite = NULL;
                }

                s = strchr(bud->ext_jid, '/');
                if (s) {
                        *s = 0; /* Should NEVER be NULL, but who knows... */
                }

                imcb_chat_add_buddy(chat, bud->ext_jid);

                if (bud != jc->me && (jc->flags & JCFLAG_ALWAYS_USE_NICKS) && !(bud->flags & JBFLAG_IS_ANONYMOUS)) {
                        imcb_buddy_nick_change(ic, bud->ext_jid, bud->resource);
                }

                if (s) {
                        *s = '/';
                }
        } else if (type) { /* type can only be NULL or "unavailable" in this function */
                if ((bud->flags & JBFLAG_IS_CHATROOM) && bud->ext_jid && !jabber_chat_has_other_resources(ic, bud)) {
                        char *reason = NULL;
                        char *status = NULL;
                        char *status_text = NULL;
                        
                        if ((c = xt_find_node_by_attr(node->children, "x", "xmlns", XMLNS_MUC_USER))) {
                                struct xt_node *c2 = c->children;

                                while ((c2 = xt_find_node(c2, "status"))) {
                                        char *code = xt_find_attr(c2, "code");
                                        if (g_strcmp0(code, "301") == 0) {
                                                status = "Banned";
                                                break;
                                        } else if (g_strcmp0(code, "303") == 0) {
                                                /* This could be handled in a cleverer way,
                                                 * but let's just show a literal part/join for now */
                                                status = "Changing nicks";
                                                break;
                                        } else if (g_strcmp0(code, "307") == 0) {
                                                status = "Kicked";
                                                break;
                                        }
                                        c2 = c2->next;
                                }

                                /* Sometimes the status message is in presence/x/item/reason */
                                if ((c2 = xt_find_path(c, "item/reason")) && c2->text && c2->text_len) {
                                        status_text = c2->text;
                                }
                        }

                        /* Sometimes the status message is right inside <presence> */
                        if ((c = xt_find_node(node->children, "status")) && c->text && c->text_len) {
                                status_text = c->text;
                        }

                        if (status_text && status) {
                                reason = g_strdup_printf("%s: %s", status, status_text);
                        } else {
                                reason = g_strdup(status_text ? : status);
                        }

                        s = strchr(bud->ext_jid, '/');
                        if (s) {
                                *s = 0;
                        }
                        imcb_chat_remove_buddy(chat, bud->ext_jid, reason);
                        if (bud != jc->me && bud->flags & JBFLAG_IS_ANONYMOUS) {
                                imcb_remove_buddy(ic, bud->ext_jid, reason);
                        }
                        if (s) {
                                *s = '/';
                        }

                        g_free(reason);
                }

                if (bud == jc->me) {
                        jabber_chat_free(chat);
                }
        }
}

void jabber_chat_pkt_message(struct im_connection *ic, struct jabber_buddy *bud, struct xt_node *node)
{
        struct xt_node *subject = xt_find_node(node->children, "subject");
        struct xt_node *body = xt_find_node(node->children, "body");
        struct groupchat *chat = NULL;
        struct jabber_chat *jc = NULL;
        char *from = NULL;
        char *nick = NULL;
        char *final_from = NULL;
        char *bare_jid = NULL;
        guint32 flags = 0;

        from = (bud) ? bud->full_jid : xt_find_attr(node, "from");

        if (from) {
                nick = strchr(from, '/');
                if (nick) {
                        *nick = 0;
                }
                chat = jabber_chat_by_jid(ic, from);
                if (nick) {
                        *nick = '/';
                        nick++;
                }
        }

        jc = (chat) ? chat->data : NULL;

        if (!bud) {
                struct xt_node *c;
                char *s;

                /* Try some clever stuff to find out the real JID here */
                c = xt_find_node_by_attr(node->children, "delay", "xmlns", XMLNS_DELAY);

                if (c && ((s = xt_find_attr(c, "from")) ||
                          (s = xt_find_attr(c, "from_jid")))) {
                        /* This won't be useful if it's the MUC JID */
                        if (!(jc && jabber_compare_jid(s, jc->name))) {
                                /* Hopefully this one makes more sense! */
                                bud = jabber_buddy_by_jid(ic, s, GET_BUDDY_FIRST | GET_BUDDY_CREAT);
                        }
                }

        }

        if (subject && chat) {
                char empty[1] = "";
                char *subject_text = subject->text_len > 0 ? subject->text : empty;
                if (g_strcmp0(chat->topic, subject_text) != 0) {
                        bare_jid = (bud) ? jabber_get_bare_jid(bud->ext_jid) : NULL;
                        imcb_chat_topic(chat, bare_jid, subject_text,
                                        jabber_get_timestamp(node));
                        g_free(bare_jid);
                        bare_jid = NULL;
                }
        }

        if (body == NULL || body->text_len == 0) {
                /* Meh. Empty messages aren't very interesting, no matter
                   how much some servers love to send them. */
                return;
        }

        if (chat == NULL) {
                if (nick == NULL) {
                        imcb_log(ic, "System message from unknown groupchat %s: %s", from, body->text);
                } else {
                        imcb_log(ic, "Groupchat message from unknown JID %s: %s", from, body->text);
                }

                return;
        } else if (chat != NULL && bud == NULL && nick == NULL) {
                imcb_chat_log(chat, "From conference server: %s", body->text);
                return;
        } else if (jc && jc->flags & JCFLAG_MESSAGE_SENT && bud == jc->me) {
                if (jabber_cache_handle_packet(ic, node) == XT_ABORT) {
                        /* Self message marked by this bitlbee, don't show it */
                        return;
                } else if (xt_find_attr(node, "id") == NULL &&
                           g_strcmp0(body->text, jc->last_sent_message) == 0) {
                        /* Some misbehaving servers (like slack) eat the ids and echo anyway.
                         * Try to detect those cases by comparing against the last sent message. */
                        return;
                }
        }

        if (bud) {
                bare_jid = jabber_get_bare_jid(bud->ext_jid ? bud->ext_jid : bud->full_jid);
                final_from = bare_jid;
                if (bud == jc->me || (g_strcasecmp(final_from, ic->acc->user) == 0)) {
                        flags = OPT_SELFMESSAGE;
                }
        } else {
                final_from = nick;
        }

        imcb_chat_msg(chat, final_from, body->text, flags, jabber_get_timestamp(node));

        g_free(bare_jid);
}