libpurple/protocols/jabber/google.c

/**
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <farsight/farsight-transport.h>

#include "internal.h"
#include "debug.h"
#include "mediamanager.h"
#include "util.h"
#include "privacy.h"

#include "buddy.h"
#include "google.h"
#include "jabber.h"
#include "presence.h"
#include "iq.h"

typedef struct {
	char *id;
	char *initiator;
} GoogleSessionId;

typedef enum {
	UNINIT,
	SENT_INITIATE,
	RECEIVED_INITIATE,
	IN_PRORESS,
	TERMINATED
} GoogleSessionState;

typedef struct {
	GoogleSessionId id;
	GoogleSessionState state;
	PurpleMedia *media;
	FarsightStream *stream;
	JabberStream *js; 
	char *remote_jid;
} GoogleSession;

GHashTable *sessions = NULL;

static guint 
google_session_id_hash(gconstpointer key) 
{
	GoogleSessionId *id = (GoogleSessionId*)key;
	
	guint id_hash = g_str_hash(id->id);
	guint init_hash = g_str_hash(id->initiator);

	return 23 * id_hash + init_hash;
}

static gboolean 
google_session_id_equal(gconstpointer a, gconstpointer b)
{
	GoogleSessionId *c = (GoogleSessionId*)a;
	GoogleSessionId *d = (GoogleSessionId*)b;
	
	return !strcmp(c->id, d->id) && !strcmp(c->initiator, d->initiator);
}

static void
google_session_destroy(GoogleSession *session)
{
	g_hash_table_remove(sessions, &(session->id));
	g_free(session->id.id);
	g_free(session->id.initiator);
	g_free(session->remote_jid);
	g_object_unref(session->media);
	g_object_unref(session->stream);
	g_free(session);
}

static xmlnode *
google_session_create_xmlnode(GoogleSession *session, const char *type)
{
	xmlnode *node = xmlnode_new("session");
	xmlnode_set_namespace(node, "http://www.google.com/session");
	xmlnode_set_attrib(node, "id", session->id.id);
	xmlnode_set_attrib(node, "initiator", session->id.initiator);
	xmlnode_set_attrib(node, "type", type);
	return node;
}

static void
google_session_send_accept(GoogleSession *session)
{
	xmlnode *sess, *desc, *payload;
	GList *codecs = farsight_stream_get_codec_intersection(session->stream);
	JabberIq *iq = jabber_iq_new(session->js, JABBER_IQ_SET);

	xmlnode_set_attrib(iq->node, "to", session->remote_jid);
	sess = google_session_create_xmlnode(session, "accept");
	xmlnode_insert_child(iq->node, sess);
	desc = xmlnode_new_child(sess, "description");
	xmlnode_set_namespace(desc, "http://www.google.com/session/phone");

	for (;codecs; codecs = codecs->next) {
		FarsightCodec *codec = (FarsightCodec*)codecs->data;
		char id[8], clockrate[10];
		payload = xmlnode_new_child(desc, "payload-type");
		g_snprintf(id, sizeof(id), "%d", codec->id);
		g_snprintf(clockrate, sizeof(clockrate), "%d", codec->clock_rate);
		xmlnode_set_attrib(payload, "name", codec->encoding_name);
		xmlnode_set_attrib(payload, "id", id);
		xmlnode_set_attrib(payload, "clockrate", clockrate);
	}

	jabber_iq_send(iq);
	farsight_stream_start(session->stream);
}

static void
google_session_send_terminate(GoogleSession *session)
{
	xmlnode *sess;
	GList *codecs = farsight_stream_get_codec_intersection(session->stream);
	JabberIq *iq = jabber_iq_new(session->js, JABBER_IQ_SET);

	xmlnode_set_attrib(iq->node, "to", session->remote_jid);
	sess = google_session_create_xmlnode(session, "terminate");
	xmlnode_insert_child(iq->node, sess);
	
	jabber_iq_send(iq);
	farsight_stream_stop(session->stream);
	google_session_destroy(session);
}

static void
google_session_send_reject(GoogleSession *session)
{
	xmlnode *sess;
	GList *codecs = farsight_stream_get_codec_intersection(session->stream);
	JabberIq *iq = jabber_iq_new(session->js, JABBER_IQ_SET);

	xmlnode_set_attrib(iq->node, "to", session->remote_jid);
	sess = google_session_create_xmlnode(session, "reject");
	xmlnode_insert_child(iq->node, sess);
	
	jabber_iq_send(iq);
	farsight_stream_stop(session->stream);
	google_session_destroy(session);
}


static void 
google_session_candidates_prepared (FarsightStream *stream, gchar *candidate_id, GoogleSession *session)
{
	JabberIq *iq = jabber_iq_new(session->js, JABBER_IQ_SET);
	GList *candidates = farsight_stream_get_native_candidate_list(stream);
	FarsightTransportInfo *transport;
	xmlnode *sess;
	xmlnode *candidate;
	sess = google_session_create_xmlnode(session, "candidates");
	xmlnode_insert_child(iq->node, sess);
	xmlnode_set_attrib(iq->node, "to", session->remote_jid);
	
	for (;candidates;candidates = candidates->next) {
		transport = (FarsightTransportInfo*)(candidates->data);
		char port[8];
		char pref[8];

		if (!strcmp(transport->ip, "127.0.0.1"))
			continue;
	
		candidate = xmlnode_new("candidate");

		g_snprintf(port, sizeof(port), "%d", transport->port);
		g_snprintf(pref, sizeof(pref), "%f", transport->preference);

		xmlnode_set_attrib(candidate, "address", transport->ip);
		xmlnode_set_attrib(candidate, "port", port);
		xmlnode_set_attrib(candidate, "name", "rtp");
		xmlnode_set_attrib(candidate, "username", transport->username);
		xmlnode_set_attrib(candidate, "password", transport->password);
		xmlnode_set_attrib(candidate, "preference", pref);
		xmlnode_set_attrib(candidate, "protocol", transport->proto == FARSIGHT_NETWORK_PROTOCOL_UDP ? "udp" : "tcp");
		xmlnode_set_attrib(candidate, "type", transport->type == FARSIGHT_CANDIDATE_TYPE_LOCAL ? "local" :
						      transport->type == FARSIGHT_CANDIDATE_TYPE_DERIVED ? "stun" :
					       	      transport->type == FARSIGHT_CANDIDATE_TYPE_RELAY ? "relay" : NULL);
		xmlnode_set_attrib(candidate, "generation", "0");
		xmlnode_set_attrib(candidate, "network", "0");
		xmlnode_insert_child(sess, candidate);
		
	}
	jabber_iq_send(iq);
}

static void
google_session_handle_initiate(JabberStream *js, GoogleSession *session, xmlnode *packet, xmlnode *sess)
{
	PurpleMedia *media;
	JabberIq *result;
	FarsightSession *fs;
	GList *codecs = NULL;
	xmlnode *desc_element, *codec_element;
	FarsightCodec *codec;
	const char *id, *encoding_name,  *clock_rate;
	int res;
	

	if (session->state != UNINIT) {
		purple_debug_error("jabber", "Received initiate for active session.\n");
		return FALSE;
	}

	fs = farsight_session_factory_make("rtp");
	if (!fs) {
		purple_debug_error("jabber", "Farsight's rtp plugin not installed");
		return FALSE;
	}
	session->stream = farsight_session_create_stream(fs, FARSIGHT_MEDIA_TYPE_AUDIO, FARSIGHT_STREAM_DIRECTION_BOTH);

	g_object_set(G_OBJECT(session->stream), "transmitter", "libjingle", NULL);
	
	desc_element = xmlnode_get_child(sess, "description");
	
	for (codec_element = xmlnode_get_child(desc_element, "payload-type"); 
	     codec_element; 
	     codec_element = xmlnode_get_next_twin(codec_element)) {
		encoding_name = xmlnode_get_attrib(codec_element, "name");
		id = xmlnode_get_attrib(codec_element, "id");
		clock_rate = xmlnode_get_attrib(codec_element, "clockrate");

		codec = g_new0(FarsightCodec, 1);
		farsight_codec_init(codec, atoi(id), encoding_name, FARSIGHT_MEDIA_TYPE_AUDIO, clock_rate ? atoi(clock_rate) : 0);
		codecs = g_list_append(codecs, codec);
	}

	session->media = media = purple_media_manager_create_media(purple_media_manager_get(), js->gc, session->remote_jid, session->stream, NULL);

	g_signal_connect_swapped(G_OBJECT(media), "accepted", G_CALLBACK(google_session_send_accept), session);
	g_signal_connect_swapped(G_OBJECT(media), "reject", G_CALLBACK(google_session_send_reject), session);
	g_signal_connect_swapped(G_OBJECT(media), "hangup", G_CALLBACK(google_session_send_terminate), session);

	
	GstElement *e = purple_media_get_audio_src(media);
	farsight_stream_set_source(session->stream, e);	
	
	e = purple_media_get_audio_sink(media);
	farsight_stream_set_sink(session->stream, e);
	
	farsight_stream_prepare_transports(session->stream);
	res = farsight_stream_set_remote_codecs(session->stream, codecs);
	
	purple_media_ready(media);

	farsight_codec_list_destroy(codecs);
	g_signal_connect(G_OBJECT(session->stream), "new-native-candidate", G_CALLBACK(google_session_candidates_prepared), session);
	result = jabber_iq_new(js, JABBER_IQ_RESULT);
	jabber_iq_set_id(result, xmlnode_get_attrib(packet, "id"));
	xmlnode_set_attrib(result->node, "to", session->remote_jid);
	jabber_iq_send(result);
}

static void 
google_session_handle_candidates(JabberStream  *js, GoogleSession *session, xmlnode *packet, xmlnode *sess)
{
	JabberIq *result;
	GList *list = NULL;
	xmlnode *cand;
	static int name = 0;
	char n[4];	
	
	for (cand = xmlnode_get_child(sess, "candidate"); cand; cand = xmlnode_get_next_twin(cand)) {
		FarsightTransportInfo *info = g_new0(FarsightTransportInfo, 1);
		g_snprintf(n, sizeof(n), "S%d", name++);
		info->ip = xmlnode_get_attrib(cand, "address");
		info->port = atoi(xmlnode_get_attrib(cand, "port"));
		info->proto = !strcmp(xmlnode_get_attrib(cand, "protocol"),"udp") ? FARSIGHT_NETWORK_PROTOCOL_UDP : FARSIGHT_NETWORK_PROTOCOL_TCP;
		info->preference = atof(xmlnode_get_attrib(cand, "preference"));
		info->type = !strcmp(xmlnode_get_attrib(cand, "type"), "local") ? FARSIGHT_CANDIDATE_TYPE_LOCAL :
			     !strcmp(xmlnode_get_attrib(cand, "type"), "stun") ? FARSIGHT_CANDIDATE_TYPE_DERIVED :
			     !strcmp(xmlnode_get_attrib(cand, "type"), "relay") ? FARSIGHT_CANDIDATE_TYPE_RELAY : FARSIGHT_CANDIDATE_TYPE_LOCAL;
		info->candidate_id = n;
		info->username = xmlnode_get_attrib(cand, "username");
		info->password = xmlnode_get_attrib(cand, "password");
		list = g_list_append(list, info);
	}

	farsight_stream_add_remote_candidate(session->stream, list);
	g_list_foreach(list, g_free, NULL);
	g_list_free(list);

	result = jabber_iq_new(js, JABBER_IQ_RESULT);
	jabber_iq_set_id(result, xmlnode_get_attrib(packet, "id"));
	xmlnode_set_attrib(result->node, "to", session->remote_jid);
	jabber_iq_send(result);
}

static void
google_session_handle_reject(JabberStream *js, GoogleSession *session, xmlnode *packet, xmlnode *sess)
{
	farsight_stream_stop(session->stream);
	purple_media_got_hangup(session->media);
	
	google_session_destroy(session);
}

static void
google_session_handle_terminate(JabberStream *js, GoogleSession *session, xmlnode *packet, xmlnode *sess)
{
	farsight_stream_stop(session->stream);
	purple_media_got_hangup(session->media);

	google_session_destroy(session);
}

static void
google_session_parse_iq(JabberStream *js, GoogleSession *session, xmlnode *packet)
{
	xmlnode *sess = xmlnode_get_child(packet, "session");	
	const char *type = xmlnode_get_attrib(sess, "type");

	if (!strcmp(type, "initiate")) {
		google_session_handle_initiate(js, session, packet, sess);
	} else if (!strcmp(type, "accept")) {
	} else if (!strcmp(type, "reject")) {
		google_session_handle_reject(js, session, packet, sess);
	} else if (!strcmp(type, "terminate")) {
		google_session_handle_terminate(js, session, packet, sess);
	} else if (!strcmp(type, "candidates")) {
		google_session_handle_candidates(js, session, packet, sess);
	}
}

void
jabber_google_session_parse(JabberStream *js, xmlnode *packet)
{
	GoogleSession *session;
	GoogleSessionId id;
	JabberIq *result;

	xmlnode *session_node;
	xmlnode *desc_node;

	if (strcmp(xmlnode_get_attrib(packet, "type"), "set"))
		return;

	session_node = xmlnode_get_child(packet, "session");
	if (!session_node)
		return;

	id.id = xmlnode_get_attrib(session_node, "id");
	if (!id.id)
		return;

	id.initiator = xmlnode_get_attrib(session_node, "initiator");
	if (!id.initiator)
		return;

	if (sessions == NULL)
		sessions = g_hash_table_new(google_session_id_hash, google_session_id_equal);
	session = (GoogleSession*)g_hash_table_lookup(sessions, &id);

	if (session) {
		google_session_parse_iq(js, session, packet);
		return;
	}

	/* If the session doesn't exist, this has to be an initiate message */
	if (strcmp(xmlnode_get_attrib(session_node, "type"), "initiate"))
		return;
	desc_node = xmlnode_get_child(session_node, "description");
	if (!desc_node)
		return;
	session = g_new0(GoogleSession, 1);
	session->id.id = g_strdup(id.id);
	session->id.initiator = g_strdup(id.initiator);
	session->state = UNINIT;
	session->js = js;
	session->remote_jid = g_strdup(session->id.initiator);
	g_hash_table_insert(sessions, &(session->id), session);

	google_session_parse_iq(js, session, packet);
}

static void
jabber_gmail_parse(JabberStream *js, xmlnode *packet, gpointer nul)
{
	const char *type = xmlnode_get_attrib(packet, "type");
	xmlnode *child;
	xmlnode *message, *sender_node, *subject_node;
	const char *from, *to, *url, *tid;
	char *subject;
	const char *in_str;
	char *to_name;
	int i, count = 1, returned_count;

	const char **tos, **froms, **urls;
	char **subjects;

	if (strcmp(type, "result"))
		return;

	child = xmlnode_get_child(packet, "mailbox");
	if (!child)
		return;

	in_str = xmlnode_get_attrib(child, "total-matched");
	if (in_str && *in_str)
		count = atoi(in_str);

	if (count == 0)
		return;

	message = xmlnode_get_child(child, "mail-thread-info");

	/* Loop once to see how many messages were returned so we can allocate arrays
	 * accordingly */
	if (!message)
		return;
	for (returned_count = 0; message; returned_count++, message=xmlnode_get_next_twin(message));

	froms    = g_new0(const char* , returned_count);
	tos      = g_new0(const char* , returned_count);
	subjects = g_new0(char* , returned_count);
	urls     = g_new0(const char* , returned_count);

	to = xmlnode_get_attrib(packet, "to");
	to_name = jabber_get_bare_jid(to);
	url = xmlnode_get_attrib(child, "url");
	if (!url || !*url)
		url = "http://www.gmail.com";

	message= xmlnode_get_child(child, "mail-thread-info");
	for (i=0; message; message = xmlnode_get_next_twin(message), i++) {
		subject_node = xmlnode_get_child(message, "subject");
		sender_node  = xmlnode_get_child(message, "senders");
		sender_node  = xmlnode_get_child(sender_node, "sender");

		while (sender_node && (!xmlnode_get_attrib(sender_node, "unread") ||
		       !strcmp(xmlnode_get_attrib(sender_node, "unread"),"0")))
			sender_node = xmlnode_get_next_twin(sender_node);

		if (!sender_node) {
			i--;
			continue;
		}

		from = xmlnode_get_attrib(sender_node, "name");
		if (!from || !*from)
			from = xmlnode_get_attrib(sender_node, "address");
		subject = xmlnode_get_data(subject_node);
		/*
		 * url = xmlnode_get_attrib(message, "url");
		 */
		tos[i] = (to_name != NULL ?  to_name : "");
		froms[i] = (from != NULL ?  from : "");
		subjects[i] = (subject != NULL ? subject : g_strdup(""));
		urls[i] = (url != NULL ? url : "");

		tid = xmlnode_get_attrib(message, "tid");
		if (tid &&
		    (js->gmail_last_tid == NULL || strcmp(tid, js->gmail_last_tid) > 0)) {
			g_free(js->gmail_last_tid);
			js->gmail_last_tid = g_strdup(tid);
		}
	}

	if (i>0)
		purple_notify_emails(js->gc, count, count == i, (const char**) subjects, froms, tos,
				urls, NULL, NULL);

	g_free(to_name);
	g_free(tos);
	g_free(froms);
	for (; i > 0; i--)
		g_free(subjects[i - 1]);
	g_free(subjects);
	g_free(urls);

	in_str = xmlnode_get_attrib(child, "result-time");
	if (in_str && *in_str) {
		g_free(js->gmail_last_time);
		js->gmail_last_time = g_strdup(in_str);
	}
}

void
jabber_gmail_poke(JabberStream *js, xmlnode *packet)
{
	const char *type;
	xmlnode *query;
	JabberIq *iq;

	/* bail if the user isn't interested */
	if (!purple_account_get_check_mail(js->gc->account))
		return;

	type = xmlnode_get_attrib(packet, "type");


	/* Is this an initial incoming mail notification? If so, send a request for more info */
	if (strcmp(type, "set") || !xmlnode_get_child(packet, "new-mail"))
		return;

	purple_debug(PURPLE_DEBUG_MISC, "jabber",
		   "Got new mail notification. Sending request for more info\n");

	iq = jabber_iq_new_query(js, JABBER_IQ_GET, "google:mail:notify");
	jabber_iq_set_callback(iq, jabber_gmail_parse, NULL);
	query = xmlnode_get_child(iq->node, "query");

	if (js->gmail_last_time)
		xmlnode_set_attrib(query, "newer-than-time", js->gmail_last_time);
	if (js->gmail_last_tid)
		xmlnode_set_attrib(query, "newer-than-tid", js->gmail_last_tid);

	jabber_iq_send(iq);
	return;
}

void jabber_gmail_init(JabberStream *js) {
	JabberIq *iq;

	if (!purple_account_get_check_mail(js->gc->account))
		return;

	iq = jabber_iq_new_query(js, JABBER_IQ_GET, "google:mail:notify");
	jabber_iq_set_callback(iq, jabber_gmail_parse, NULL);
	jabber_iq_send(iq);
}

void jabber_google_roster_init(JabberStream *js)
{
	JabberIq *iq;
	xmlnode *query;

	iq = jabber_iq_new_query(js, JABBER_IQ_GET, "jabber:iq:roster");
	query = xmlnode_get_child(iq->node, "query");

	xmlnode_set_attrib(query, "xmlns:gr", "google:roster");
	xmlnode_set_attrib(query, "gr:ext", "2");

	jabber_iq_send(iq);
}

void jabber_google_roster_outgoing(JabberStream *js, xmlnode *query, xmlnode *item)
{
	PurpleAccount *account = purple_connection_get_account(js->gc);
	GSList *list = account->deny;
	const char *jid = xmlnode_get_attrib(item, "jid");
	char *jid_norm = g_strdup(jabber_normalize(account, jid));

	while (list) {
		if (!strcmp(jid_norm, (char*)list->data)) {
			xmlnode_set_attrib(query, "xmlns:gr", "google:roster");
			xmlnode_set_attrib(item, "gr:t", "B");
			xmlnode_set_attrib(query, "xmlns:gr", "google:roster");
			xmlnode_set_attrib(query, "gr:ext", "2");
			return;
		}
		list = list->next;
	}

	g_free(jid_norm);

}

gboolean jabber_google_roster_incoming(JabberStream *js, xmlnode *item)
{
	PurpleAccount *account = purple_connection_get_account(js->gc);
	GSList *list = account->deny;
	const char *jid = xmlnode_get_attrib(item, "jid");
	gboolean on_block_list = FALSE;

	char *jid_norm = g_strdup(jabber_normalize(account, jid));

	const char *grt = xmlnode_get_attrib_with_namespace(item, "t", "google:roster");
	const char *subscription = xmlnode_get_attrib(item, "subscription");

	if (!subscription || !strcmp(subscription, "none")) {
		/* The Google Talk servers will automatically add people from your Gmail address book
		 * with subscription=none. If we see someone with subscription=none, ignore them.
		 */
		return FALSE;
	}

	while (list) {
		if (!strcmp(jid_norm, (char*)list->data)) {
			on_block_list = TRUE;
			break;
		}
		list = list->next;
	}

	if (grt && (*grt == 'H' || *grt == 'h')) {
		PurpleBuddy *buddy = purple_find_buddy(account, jid_norm);
		purple_blist_remove_buddy(buddy);
		g_free(jid_norm);
		return FALSE;
	}

	if (!on_block_list && (grt && (*grt == 'B' || *grt == 'b'))) {
		purple_debug_info("jabber", "Blocking %s\n", jid_norm);
		purple_privacy_deny_add(account, jid_norm, TRUE);
	} else if (on_block_list && (!grt || (*grt != 'B' && *grt != 'b' ))){
		purple_debug_info("jabber", "Unblocking %s\n", jid_norm);
		purple_privacy_deny_remove(account, jid_norm, TRUE);
	}

	g_free(jid_norm);
	return TRUE;
}

void jabber_google_roster_add_deny(PurpleConnection *gc, const char *who)
{
	JabberStream *js;
	GSList *buddies;
	JabberIq *iq;
	xmlnode *query;
	xmlnode *item;
	xmlnode *group;
	PurpleBuddy *b;
	JabberBuddy *jb;

	js = (JabberStream*)(gc->proto_data);

	if (!js || !js->server_caps & JABBER_CAP_GOOGLE_ROSTER)
		return;

	jb = jabber_buddy_find(js, who, TRUE);

	buddies = purple_find_buddies(js->gc->account, who);
	if(!buddies)
		return;

	b = buddies->data;

	iq = jabber_iq_new_query(js, JABBER_IQ_SET, "jabber:iq:roster");

	query = xmlnode_get_child(iq->node, "query");
	item = xmlnode_new_child(query, "item");

	while(buddies) {
		PurpleGroup *g;

		b = buddies->data;
		g = purple_buddy_get_group(b);

		group = xmlnode_new_child(item, "group");
		xmlnode_insert_data(group, g->name, -1);

		buddies = buddies->next;
	}

	iq = jabber_iq_new_query(js, JABBER_IQ_SET, "jabber:iq:roster");

	query = xmlnode_get_child(iq->node, "query");
	item = xmlnode_new_child(query, "item");

	xmlnode_set_attrib(item, "jid", who);
	xmlnode_set_attrib(item, "name", b->alias ? b->alias : "");
	xmlnode_set_attrib(item, "gr:t", "B");
	xmlnode_set_attrib(query, "xmlns:gr", "google:roster");
	xmlnode_set_attrib(query, "gr:ext", "2");

	jabber_iq_send(iq);

	/* Synthesize a sign-off */
	if (jb) {
		JabberBuddyResource *jbr;
		GList *l = jb->resources;
		while (l) {
			jbr = l->data;
			if (jbr && jbr->name)
			{
				purple_debug(PURPLE_DEBUG_MISC, "jabber", "Removing resource %s\n", jbr->name);
				jabber_buddy_remove_resource(jb, jbr->name);
			}
			l = l->next;
		}
	}
	purple_prpl_got_user_status(purple_connection_get_account(gc), who, "offline", NULL);
}

void jabber_google_roster_rem_deny(PurpleConnection *gc, const char *who)
{
	JabberStream *js;
	GSList *buddies;
	JabberIq *iq;
	xmlnode *query;
	xmlnode *item;
	xmlnode *group;
	PurpleBuddy *b;

	g_return_if_fail(gc != NULL);
	g_return_if_fail(who != NULL);

	js = (JabberStream*)(gc->proto_data);

	if (!js || !js->server_caps & JABBER_CAP_GOOGLE_ROSTER)
		return;

	buddies = purple_find_buddies(js->gc->account, who);
	if(!buddies)
		return;

	b = buddies->data;

	iq = jabber_iq_new_query(js, JABBER_IQ_SET, "jabber:iq:roster");

	query = xmlnode_get_child(iq->node, "query");
	item = xmlnode_new_child(query, "item");

	while(buddies) {
		PurpleGroup *g;

		b = buddies->data;
		g = purple_buddy_get_group(b);

		group = xmlnode_new_child(item, "group");
		xmlnode_insert_data(group, g->name, -1);

		buddies = buddies->next;
	}

	iq = jabber_iq_new_query(js, JABBER_IQ_SET, "jabber:iq:roster");

	query = xmlnode_get_child(iq->node, "query");
	item = xmlnode_new_child(query, "item");

	xmlnode_set_attrib(item, "jid", who);
	xmlnode_set_attrib(item, "name", b->alias ? b->alias : "");
	xmlnode_set_attrib(query, "xmlns:gr", "google:roster");
	xmlnode_set_attrib(query, "gr:ext", "2");

	jabber_iq_send(iq);

	/* See if he's online */
	jabber_presence_subscription_set(js, who, "probe");
}

/* This does two passes on the string. The first pass goes through
 * and determine if all the structured text is properly balanced, and
 * how many instances of each there is. The second pass goes and converts
 * everything to HTML, depending on what's figured out by the first pass.
 * It will short circuit once it knows it has no more replacements to make
 */
char *jabber_google_format_to_html(const char *text)
{
	const char *p;

	/* The start of the screen may be consdiered a space for this purpose */
	gboolean preceding_space = TRUE;

	gboolean in_bold = FALSE, in_italic = FALSE;
	gboolean in_tag = FALSE;

	gint bold_count = 0, italic_count = 0;

	GString *str;

	for (p = text; *p != '\0'; p = g_utf8_next_char(p)) {
		gunichar c = g_utf8_get_char(p);
		if (c == '*' && !in_tag) {
			if (in_bold && (g_unichar_isspace(*(p+1)) ||
					*(p+1) == '\0' ||
					*(p+1) == '<')) {
				bold_count++;
				in_bold = FALSE;
			} else if (preceding_space && !in_bold && !g_unichar_isspace(*(p+1))) {
				bold_count++;
				in_bold = TRUE;
			}
			preceding_space = TRUE;
		} else if (c == '_' && !in_tag) {
			if (in_italic && (g_unichar_isspace(*(p+1)) ||
					*(p+1) == '\0' ||
					*(p+1) == '<')) {
				italic_count++;
				in_italic = FALSE;
			} else if (preceding_space && !in_italic && !g_unichar_isspace(*(p+1))) {
				italic_count++;
				in_italic = TRUE;
			}
			preceding_space = TRUE;
		} else if (c == '<' && !in_tag) {
			in_tag = TRUE;
		} else if (c == '>' && in_tag) {
			in_tag = FALSE;
		} else if (!in_tag) {
			if (g_unichar_isspace(c))
				preceding_space = TRUE;
			else
				preceding_space = FALSE;
		}
	}

	str  = g_string_new(NULL);
	in_bold = in_italic = in_tag = FALSE;
	preceding_space = TRUE;

	for (p = text; *p != '\0'; p = g_utf8_next_char(p)) {
		gunichar c = g_utf8_get_char(p);

		if (bold_count < 2 && italic_count < 2 && !in_bold && !in_italic) {
			g_string_append(str, p);
			return g_string_free(str, FALSE);
		}


		if (c == '*' && !in_tag) {
			if (in_bold &&
			    (g_unichar_isspace(*(p+1))||*(p+1)=='<')) { /* This is safe in UTF-8 */
				str = g_string_append(str, "</b>");
				in_bold = FALSE;
				bold_count--;
			} else if (preceding_space && bold_count > 1 && !g_unichar_isspace(*(p+1))) {
				str = g_string_append(str, "<b>");
				bold_count--;
				in_bold = TRUE;
			} else {
				str = g_string_append_unichar(str, c);
			}
			preceding_space = TRUE;
		} else if (c == '_' && !in_tag) {
			if (in_italic &&
			    (g_unichar_isspace(*(p+1))||*(p+1)=='<')) {
				str = g_string_append(str, "</i>");
				italic_count--;
				in_italic = FALSE;
			} else if (preceding_space && italic_count > 1 && !g_unichar_isspace(*(p+1))) {
				str = g_string_append(str, "<i>");
				italic_count--;
				in_italic = TRUE;
			} else {
				str = g_string_append_unichar(str, c);
			}
			preceding_space = TRUE;
		} else if (c == '<' && !in_tag) {
			str = g_string_append_unichar(str, c);
			in_tag = TRUE;
		} else if (c == '>' && in_tag) {
			str = g_string_append_unichar(str, c);
			in_tag = FALSE;
		} else if (!in_tag) {
			str = g_string_append_unichar(str, c);
			if (g_unichar_isspace(c))
				preceding_space = TRUE;
			else
				preceding_space = FALSE;
		} else {
			str = g_string_append_unichar(str, c);
		}
	}
	return g_string_free(str, FALSE);
}