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path: root/protocols/twitter/twitter_lib.c
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  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2001-2005 Wilmer van der Gaast and others                *
  \********************************************************************/

/* URL/mirror stuff - Stolen from Axel                                  */

/*
  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#include "url.h"

/* Convert an URL to a url_t structure					*/
int url_set( url_t *url, char *set_url )
{
	char s[MAX_STRING];
	char *i;
	
	/* protocol://							*/
	if( ( i = strstr( set_url, "://" ) ) == NULL )
	{
		url->proto = PROTO_DEFAULT;
		strncpy( s, set_url, MAX_STRING );
	}
	else
	{
		if( g_strncasecmp( set_url, "http", i - set_url ) == 0 )
			url->proto = PROTO_HTTP;
		else if( g_strncasecmp( set_url, "https", i - set_url ) == 0 )
			url->proto = PROTO_HTTPS;
		else if( g_strncasecmp( set_url, "socks4", i - set_url ) == 0 )
			url->proto = PROTO_SOCKS4;
		else if( g_strncasecmp( set_url, "socks5", i - set_url ) == 0 )
			url->proto = PROTO_SOCKS5;
		else
		{
			return( 0 );
		}
		strncpy( s, i + 3, MAX_STRING );
	}
	
	/* Split							*/
	if( ( i = strchr( s, '/' ) ) == NULL )
	{
		strcpy( url->file, "/" );
	}
	else
	{
		strncpy( url->file, i, MAX_STRING );
		*i = 0;
	}
	strncpy( url->host, s, MAX_STRING );
	
	/* Check for username in host field				*/
	if( strrchr( url->host, '@' ) != NULL )
	{
		strncpy( url->user, url->host, MAX_STRING );
		i = strrchr( url->user, '@' );
		*i = 0;
		strcpy( url->host, i + 1 );
		*url->pass = 0;
	}
	/* If not: Fill in defaults					*/
	else
	{
		*url->user = *url->pass = 0;
	}
	
	/* Password?							*/
	if( ( i = strchr( url->user, ':' ) ) != NULL )
	{
		*i = 0;
		strcpy( url->pass, i + 1 );
	}
	/* Port number?							*/
	if( ( i = strchr( url->host, ':' ) ) != NULL )
	{
		*i = 0;
		sscanf( i + 1, "%d", &url->port );
	}
	else
	{
		if( url->proto == PROTO_HTTP )
			url->port = 80;
		else if( url->proto == PROTO_HTTPS )
			url->port = 443;
		else if( url->proto == PROTO_SOCKS4 || url->proto == PROTO_SOCKS4 )
			url->port = 1080;
	}
	
	return( url->port > 0 );
}
id='n852' href='#n852'>852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Simple module to facilitate twitter functionality.                       *
*                                                                           *
*  Copyright 2009-2010 Geert Mulders <g.c.w.m.mulders@gmail.com>            *
*  Copyright 2010-2012 Wilmer van der Gaast <wilmer@gaast.net>              *
*                                                                           *
*  This library is free software; you can redistribute it and/or            *
*  modify it under the terms of the GNU Lesser General Public               *
*  License as published by the Free Software Foundation, version            *
*  2.1.                                                                     *
*                                                                           *
*  This library 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        *
*  Lesser General Public License for more details.                          *
*                                                                           *
*  You should have received a copy of the GNU Lesser General Public License *
*  along with this library; if not, write to the Free Software Foundation,  *
*  Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA           *
*                                                                           *
****************************************************************************/

/* For strptime(): */
#if(__sun)
#else
#define _XOPEN_SOURCE
#endif

#include "twitter_http.h"
#include "twitter.h"
#include "bitlbee.h"
#include "url.h"
#include "misc.h"
#include "base64.h"
#include "xmltree.h"
#include "twitter_lib.h"
#include <ctype.h>
#include <errno.h>

/* GLib < 2.12.0 doesn't have g_ascii_strtoll(), work around using system strtoll(). */
/* GLib < 2.12.4 can be buggy: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=488013 */
#if !GLIB_CHECK_VERSION(2,12,5)
#include <stdlib.h>
#include <limits.h>
#define g_ascii_strtoll strtoll
#endif

#define TXL_STATUS 1
#define TXL_USER 2
#define TXL_ID 3

struct twitter_xml_list {
	int type;
	gint64 next_cursor;
	GSList *list;
};

struct twitter_xml_user {
	char *name;
	char *screen_name;
};

struct twitter_xml_status {
	time_t created_at;
	char *text;
	struct twitter_xml_user *user;
	guint64 id, reply_to;
};

static void twitter_groupchat_init(struct im_connection *ic);

/**
 * Frees a twitter_xml_user struct.
 */
static void txu_free(struct twitter_xml_user *txu)
{
	if (txu == NULL)
		return;

	g_free(txu->name);
	g_free(txu->screen_name);
	g_free(txu);
}

/**
 * Frees a twitter_xml_status struct.
 */
static void txs_free(struct twitter_xml_status *txs)
{
	if (txs == NULL)
		return;

	g_free(txs->text);
	txu_free(txs->user);
	g_free(txs);
}

/**
 * Free a twitter_xml_list struct.
 * type is the type of list the struct holds.
 */
static void txl_free(struct twitter_xml_list *txl)
{
	GSList *l;
	if (txl == NULL)
		return;

	for (l = txl->list; l; l = g_slist_next(l)) {
		if (txl->type == TXL_STATUS) {
			txs_free((struct twitter_xml_status *) l->data);
		} else if (txl->type == TXL_ID) {
			g_free(l->data);
		} else if (txl->type == TXL_USER) {
			txu_free(l->data);
		}
	}

	g_slist_free(txl->list);
	g_free(txl);
}

/**
 * Compare status elements
 */
static gint twitter_compare_elements(gconstpointer a, gconstpointer b)
{
	struct twitter_xml_status *a_status = (struct twitter_xml_status *) a;
	struct twitter_xml_status *b_status = (struct twitter_xml_status *) b;

	if (a_status->created_at < b_status->created_at) {
		return -1;
	} else if (a_status->created_at > b_status->created_at) {
		return 1;
	} else {
		return 0;
	}
}

/**
 * Add a buddy if it is not already added, set the status to logged in.
 */
static void twitter_add_buddy(struct im_connection *ic, char *name, const char *fullname)
{
	struct twitter_data *td = ic->proto_data;

	// Check if the buddy is already in the buddy list.
	if (!bee_user_by_handle(ic->bee, ic, name)) {
		char *mode = set_getstr(&ic->acc->set, "mode");

		// The buddy is not in the list, add the buddy and set the status to logged in.
		imcb_add_buddy(ic, name, NULL);
		imcb_rename_buddy(ic, name, fullname);
		if (g_strcasecmp(mode, "chat") == 0) {
			/* Necessary so that nicks always get translated to the
			   exact Twitter username. */
			imcb_buddy_nick_hint(ic, name, name);
			imcb_chat_add_buddy(td->timeline_gc, name);
		} else if (g_strcasecmp(mode, "many") == 0)
			imcb_buddy_status(ic, name, OPT_LOGGED_IN, NULL, NULL);
	}
}

/* Warning: May return a malloc()ed value, which will be free()d on the next
   call. Only for short-term use. NOT THREADSAFE!  */
char *twitter_parse_error(struct http_request *req)
{
	static char *ret = NULL;
	struct xt_node *root, *node, *err;

	g_free(ret);
	ret = NULL;

	if (req->body_size > 0) {
		root = xt_from_string(req->reply_body, req->body_size);
		
		for (node = root; node; node = node->next)
			if ((err = xt_find_node(node->children, "error")) && err->text_len > 0) {
				ret = g_strdup_printf("%s (%s)", req->status_string, err->text);
				break;
			}

		xt_free_node(root);
	}

	return ret ? ret : req->status_string;
}

static struct xt_node *twitter_parse_response(struct im_connection *ic, struct http_request *req)
{
	gboolean logging_in = !(ic->flags & OPT_LOGGED_IN);
	gboolean periodic;
	struct twitter_data *td = ic->proto_data;
	struct xt_node *ret;
	char path[64] = "", *s;
	
	if ((s = strchr(req->request, ' '))) {
		path[sizeof(path)-1] = '\0';
		strncpy(path, s + 1, sizeof(path) - 1);
		if ((s = strchr(path, '?')) || (s = strchr(path, ' ')))
			*s = '\0';
	}
	
	/* Kinda nasty. :-( Trying to suppress error messages, but only
	   for periodic (i.e. mentions/timeline) queries. */
	periodic = strstr(path, "timeline") || strstr(path, "mentions");
	
	if (req->status_code == 401 && logging_in) {
		/* IIRC Twitter once had an outage where they were randomly
		   throwing 401s so I'll keep treating this one as fatal
		   only during login. */
		imcb_error(ic, "Authentication failure");
		imc_logout(ic, FALSE);
		return NULL;
	} else if (req->status_code != 200) {
		// It didn't go well, output the error and return.
		if (!periodic || logging_in || ++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
				   path, twitter_parse_error(req));
		
		if (logging_in)
			imc_logout(ic, TRUE);
		return NULL;
	} else {
		td->http_fails = 0;
	}

	if ((ret = xt_from_string(req->reply_body, req->body_size)) == NULL) {
		imcb_error(ic, "Could not retrieve %s: %s",
			   path, "XML parse error");
	}
	return ret;
}

static void twitter_http_get_friends_ids(struct http_request *req);

/**
 * Get the friends ids.
 */
void twitter_get_friends_ids(struct im_connection *ic, gint64 next_cursor)
{
	// Primitive, but hey! It works...      
	char *args[2];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	twitter_http(ic, TWITTER_FRIENDS_IDS_URL, twitter_http_get_friends_ids, ic, 0, args, 2);

	g_free(args[1]);
}

/**
 * Function to help fill a list.
 */
static xt_status twitter_xt_next_cursor(struct xt_node *node, struct twitter_xml_list *txl)
{
	char *end = NULL;

	if (node->text)
		txl->next_cursor = g_ascii_strtoll(node->text, &end, 10);
	if (end == NULL)
		txl->next_cursor = -1;

	return XT_HANDLED;
}

/**
 * Fill a list of ids.
 */
static xt_status twitter_xt_get_friends_id_list(struct xt_node *node, struct twitter_xml_list *txl)
{
	struct xt_node *child;

	// Set the list type.
	txl->type = TXL_ID;

	// The root <statuses> node should hold the list of statuses <status>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("ids", child->name) == 0) {
			struct xt_node *idc;
			for (idc = child->children; idc; idc = idc->next)
				if (g_strcasecmp(idc->name, "id") == 0)
					txl->list = g_slist_prepend(txl->list,
						g_memdup(idc->text, idc->text_len + 1));
		} else if (g_strcasecmp("next_cursor", child->name) == 0) {
			twitter_xt_next_cursor(child, txl);
		}
	}

	return XT_HANDLED;
}

static void twitter_get_users_lookup(struct im_connection *ic);

/**
 * Callback for getting the friends ids.
 */
static void twitter_http_get_friends_ids(struct http_request *req)
{
	struct im_connection *ic;
	struct xt_node *parsed;
	struct twitter_xml_list *txl;
	struct twitter_data *td;

	ic = req->data;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	/* Create the room now that we "logged in". */
	if (!td->timeline_gc && g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "chat") == 0)
		twitter_groupchat_init(ic);

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = td->follow_ids;

	// Parse the data.
	if (!(parsed = twitter_parse_response(ic, req)))
		return;
	twitter_xt_get_friends_id_list(parsed, txl);
	xt_free_node(parsed);

	td->follow_ids = txl->list;
	if (txl->next_cursor)
		/* These were just numbers. Up to 4000 in a response AFAIK so if we get here
		   we may be using a spammer account. \o/ */
		twitter_get_friends_ids(ic, txl->next_cursor);
	else
		/* Now to convert all those numbers into names.. */
		twitter_get_users_lookup(ic);

	txl->list = NULL;
	txl_free(txl);
}

static xt_status twitter_xt_get_users(struct xt_node *node, struct twitter_xml_list *txl);
static void twitter_http_get_users_lookup(struct http_request *req);

static void twitter_get_users_lookup(struct im_connection *ic)
{
	struct twitter_data *td = ic->proto_data;
	char *args[2] = {
		"user_id",
		NULL,
	};
	GString *ids = g_string_new("");
	int i;
	
	/* We can request up to 100 users at a time. */
	for (i = 0; i < 100 && td->follow_ids; i ++) {
		g_string_append_printf(ids, ",%s", (char*) td->follow_ids->data);
		g_free(td->follow_ids->data);
		td->follow_ids = g_slist_remove(td->follow_ids, td->follow_ids->data);
	}
	if (ids->len > 0) {
		args[1] = ids->str + 1;
		/* POST, because I think ids can be up to 1KB long. */
		twitter_http(ic, TWITTER_USERS_LOOKUP_URL, twitter_http_get_users_lookup, ic, 1, args, 2);
	} else {
		/* We have all users. Continue with login. (Get statuses.) */
		td->flags |= TWITTER_HAVE_FRIENDS;
		twitter_login_finish(ic);
	}
	g_string_free(ids, TRUE);
}

/**
 * Callback for getting (twitter)friends...
 *
 * Be afraid, be very afraid! This function will potentially add hundreds of "friends". "Who has 
 * hundreds of friends?" you wonder? You probably not, since you are reading the source of 
 * BitlBee... Get a life and meet new people!
 */
static void twitter_http_get_users_lookup(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct xt_node *parsed;
	struct twitter_xml_list *txl;
	GSList *l = NULL;
	struct twitter_xml_user *user;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// Get the user list from the parsed xml feed.
	if (!(parsed = twitter_parse_response(ic, req)))
		return;
	twitter_xt_get_users(parsed, txl);
	xt_free_node(parsed);

	// Add the users as buddies.
	for (l = txl->list; l; l = g_slist_next(l)) {
		user = l->data;
		twitter_add_buddy(ic, user->screen_name, user->name);
	}

	// Free the structure.
	txl_free(txl);

	twitter_get_users_lookup(ic);
}

/**
 * Function to fill a twitter_xml_user struct.
 * It sets:
 *  - the name and
 *  - the screen_name.
 */
static xt_status twitter_xt_get_user(struct xt_node *node, struct twitter_xml_user *txu)
{
	struct xt_node *child;

	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("name", child->name) == 0) {
			txu->name = g_memdup(child->text, child->text_len + 1);
		} else if (g_strcasecmp("screen_name", child->name) == 0) {
			txu->screen_name = g_memdup(child->text, child->text_len + 1);
		}
	}
	return XT_HANDLED;
}

/**
 * Function to fill a twitter_xml_list struct.
 * It sets:
 *  - all <user>s from the <users> element.
 */
static xt_status twitter_xt_get_users(struct xt_node *node, struct twitter_xml_list *txl)
{
	struct twitter_xml_user *txu;
	struct xt_node *child;

	// Set the type of the list.
	txl->type = TXL_USER;

	// The root <users> node should hold the list of users <user>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("user", child->name) == 0) {
			txu = g_new0(struct twitter_xml_user, 1);
			twitter_xt_get_user(child, txu);
			// Put the item in the front of the list.
			txl->list = g_slist_prepend(txl->list, txu);
		}
	}

	return XT_HANDLED;
}

#ifdef __GLIBC__
#define TWITTER_TIME_FORMAT "%a %b %d %H:%M:%S %z %Y"
#else
#define TWITTER_TIME_FORMAT "%a %b %d %H:%M:%S +0000 %Y"
#endif

/**
 * Function to fill a twitter_xml_status struct.
 * It sets:
 *  - the status text and
 *  - the created_at timestamp and
 *  - the status id and
 *  - the user in a twitter_xml_user struct.
 */
static xt_status twitter_xt_get_status(struct xt_node *node, struct twitter_xml_status *txs)
{
	struct xt_node *child, *rt = NULL;

	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("text", child->name) == 0) {
			txs->text = g_memdup(child->text, child->text_len + 1);
		} else if (g_strcasecmp("retweeted_status", child->name) == 0) {
			rt = child;
		} else if (g_strcasecmp("created_at", child->name) == 0) {
			struct tm parsed;

			/* Very sensitive to changes to the formatting of
			   this field. :-( Also assumes the timezone used
			   is UTC since C time handling functions suck. */
			if (strptime(child->text, TWITTER_TIME_FORMAT, &parsed) != NULL)
				txs->created_at = mktime_utc(&parsed);
		} else if (g_strcasecmp("user", child->name) == 0) {
			txs->user = g_new0(struct twitter_xml_user, 1);
			twitter_xt_get_user(child, txs->user);
		} else if (g_strcasecmp("id", child->name) == 0) {
			txs->id = g_ascii_strtoull(child->text, NULL, 10);
		} else if (g_strcasecmp("in_reply_to_status_id", child->name) == 0) {
			txs->reply_to = g_ascii_strtoull(child->text, NULL, 10);
		}
	}

	/* If it's a (truncated) retweet, get the original. Even if the API claims it
	   wasn't truncated because it may be lying. */
	if (rt) {
		struct twitter_xml_status *rtxs = g_new0(struct twitter_xml_status, 1);
		if (twitter_xt_get_status(rt, rtxs) != XT_HANDLED) {
			txs_free(rtxs);
			return XT_HANDLED;
		}

		g_free(txs->text);
		txs->text = g_strdup_printf("RT @%s: %s", rtxs->user->screen_name, rtxs->text);
		txs_free(rtxs);
	} else {
		struct xt_node *urls, *url;
		
		urls = xt_find_path(node, "entities");
		if (urls != NULL)
			urls = urls->children;
		for (; urls; urls = urls->next) {
			if (strcmp(urls->name, "urls") != 0 && strcmp(urls->name, "media") != 0)
				continue;
			
			for (url = urls ? urls->children : NULL; url; url = url->next) {
				/* "short" is a reserved word. :-P */
				struct xt_node *kort = xt_find_node(url->children, "url");
				struct xt_node *disp = xt_find_node(url->children, "display_url");
				char *pos, *new;
				
				if (!kort || !kort->text || !disp || !disp->text ||
				    !(pos = strstr(txs->text, kort->text)))
					continue;
				
				*pos = '\0';
				new = g_strdup_printf("%s%s &lt;%s&gt;%s", txs->text, kort->text,
				                      disp->text, pos + strlen(kort->text));
				
				g_free(txs->text);
				txs->text = new;
			}
		}
	}

	return XT_HANDLED;
}

/**
 * Function to fill a twitter_xml_list struct.
 * It sets:
 *  - all <status>es within the <status> element and
 *  - the next_cursor.
 */
static xt_status twitter_xt_get_status_list(struct im_connection *ic, struct xt_node *node,
					    struct twitter_xml_list *txl)
{
	struct twitter_xml_status *txs;
	struct xt_node *child;
	bee_user_t *bu;

	// Set the type of the list.
	txl->type = TXL_STATUS;

	// The root <statuses> node should hold the list of statuses <status>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("status", child->name) == 0) {
			txs = g_new0(struct twitter_xml_status, 1);
			twitter_xt_get_status(child, txs);
			// Put the item in the front of the list.
			txl->list = g_slist_prepend(txl->list, txs);

			if (txs->user && txs->user->screen_name &&
			    (bu = bee_user_by_handle(ic->bee, ic, txs->user->screen_name))) {
				struct twitter_user_data *tud = bu->data;

				if (txs->id > tud->last_id) {
					tud->last_id = txs->id;
					tud->last_time = txs->created_at;
				}
			}
		} else if (g_strcasecmp("next_cursor", child->name) == 0) {
			twitter_xt_next_cursor(child, txl);
		}
	}

	return XT_HANDLED;
}

static char *twitter_msg_add_id(struct im_connection *ic,
				struct twitter_xml_status *txs, const char *prefix)
{
	struct twitter_data *td = ic->proto_data;
	char *ret = NULL;

	if (!set_getbool(&ic->acc->set, "show_ids")) {
		if (*prefix)
			return g_strconcat(prefix, txs->text, NULL);
		else
			return NULL;
	}

	td->log[td->log_id].id = txs->id;
	td->log[td->log_id].bu = bee_user_by_handle(ic->bee, ic, txs->user->screen_name);
	if (txs->reply_to) {
		int i;
		for (i = 0; i < TWITTER_LOG_LENGTH; i++)
			if (td->log[i].id == txs->reply_to) {
				ret = g_strdup_printf("\002[\002%02d->%02d\002]\002 %s%s",
						      td->log_id, i, prefix, txs->text);
				break;
			}
	}
	if (ret == NULL)
		ret = g_strdup_printf("\002[\002%02d\002]\002 %s%s", td->log_id, prefix, txs->text);
	td->log_id = (td->log_id + 1) % TWITTER_LOG_LENGTH;

	return ret;
}

static void twitter_groupchat_init(struct im_connection *ic)
{
	char *name_hint;
	struct groupchat *gc;
	struct twitter_data *td = ic->proto_data;
	GSList *l;

	td->timeline_gc = gc = imcb_chat_new(ic, "twitter/timeline");

	name_hint = g_strdup_printf("%s_%s", td->prefix, ic->acc->user);
	imcb_chat_name_hint(gc, name_hint);
	g_free(name_hint);

	for (l = ic->bee->users; l; l = l->next) {
		bee_user_t *bu = l->data;
		if (bu->ic == ic)
			imcb_chat_add_buddy(td->timeline_gc, bu->handle);
	}
}

/**
 * Function that is called to see the statuses in a groupchat window.
 */
static void twitter_groupchat(struct im_connection *ic, GSList * list)
{
	struct twitter_data *td = ic->proto_data;
	GSList *l = NULL;
	struct twitter_xml_status *status;
	struct groupchat *gc;
	guint64 last_id = 0;

	// Create a new groupchat if it does not exsist.
	if (!td->timeline_gc)
		twitter_groupchat_init(ic);

	gc = td->timeline_gc;
	if (!gc->joined)
		imcb_chat_add_buddy(gc, ic->acc->user);

	for (l = list; l; l = g_slist_next(l)) {
		char *msg;

		status = l->data;
		if (status->user == NULL || status->text == NULL || last_id == status->id)
			continue;

		last_id = status->id;

		strip_html(status->text);

		if (set_getbool(&ic->acc->set, "strip_newlines"))
			strip_newlines(status->text);

		msg = twitter_msg_add_id(ic, status, "");

		// Say it!
		if (g_strcasecmp(td->user, status->user->screen_name) == 0) {
			imcb_chat_log(gc, "You: %s", msg ? msg : status->text);
		} else {
			twitter_add_buddy(ic, status->user->screen_name, status->user->name);

			imcb_chat_msg(gc, status->user->screen_name,
				      msg ? msg : status->text, 0, status->created_at);
		}

		g_free(msg);

		// Update the timeline_id to hold the highest id, so that by the next request
		// we won't pick up the updates already in the list.
		td->timeline_id = MAX(td->timeline_id, status->id);
	}
}

/**
 * Function that is called to see statuses as private messages.
 */
static void twitter_private_message_chat(struct im_connection *ic, GSList * list)
{
	struct twitter_data *td = ic->proto_data;
	GSList *l = NULL;
	struct twitter_xml_status *status;
	char from[MAX_STRING];
	gboolean mode_one;
	guint64 last_id = 0;

	mode_one = g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "one") == 0;

	if (mode_one) {
		g_snprintf(from, sizeof(from) - 1, "%s_%s", td->prefix, ic->acc->user);
		from[MAX_STRING - 1] = '\0';
	}

	for (l = list; l; l = g_slist_next(l)) {
		char *prefix = NULL, *text = NULL;

		status = l->data;
		if (status->user == NULL || status->text == NULL || last_id == status->id)
			continue;

		last_id = status->id;

		strip_html(status->text);
		if (mode_one)
			prefix = g_strdup_printf("\002<\002%s\002>\002 ",
						 status->user->screen_name);
		else
			twitter_add_buddy(ic, status->user->screen_name, status->user->name);

		text = twitter_msg_add_id(ic, status, prefix ? prefix : "");

		imcb_buddy_msg(ic,
			       mode_one ? from : status->user->screen_name,
			       text ? text : status->text, 0, status->created_at);

		// Update the timeline_id to hold the highest id, so that by the next request
		// we won't pick up the updates already in the list.
		td->timeline_id = MAX(td->timeline_id, status->id);

		g_free(text);
		g_free(prefix);
	}
}

static void twitter_http_get_home_timeline(struct http_request *req);
static void twitter_http_get_mentions(struct http_request *req);

/**
 * Get the timeline with optionally mentions
 */
void twitter_get_timeline(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;
	gboolean include_mentions = set_getbool(&ic->acc->set, "fetch_mentions");

	if (td->flags & TWITTER_DOING_TIMELINE) {
		if (++td->http_fails >= 5) {
			imcb_error(ic, "Fetch timeout (%d)", td->flags);
			imc_logout(ic, TRUE);
		}
	}

	td->flags |= TWITTER_DOING_TIMELINE;

	twitter_get_home_timeline(ic, next_cursor);

	if (include_mentions) {
		twitter_get_mentions(ic, next_cursor);
	}
}

/**
 * Call this one after receiving timeline/mentions. Show to user once we have
 * both.
 */
void twitter_flush_timeline(struct im_connection *ic)
{
	struct twitter_data *td = ic->proto_data;
	gboolean include_mentions = set_getbool(&ic->acc->set, "fetch_mentions");
	int show_old_mentions = set_getint(&ic->acc->set, "show_old_mentions");
	struct twitter_xml_list *home_timeline = td->home_timeline_obj;
	struct twitter_xml_list *mentions = td->mentions_obj;
	GSList *output = NULL;
	GSList *l;

	if (!(td->flags & TWITTER_GOT_TIMELINE)) {
		return;
	}

	if (include_mentions && !(td->flags & TWITTER_GOT_MENTIONS)) {
		return;
	}

	if (home_timeline && home_timeline->list) {
		for (l = home_timeline->list; l; l = g_slist_next(l)) {
			output = g_slist_insert_sorted(output, l->data, twitter_compare_elements);
		}
	}

	if (include_mentions && mentions && mentions->list) {
		for (l = mentions->list; l; l = g_slist_next(l)) {
			if (show_old_mentions < 1 && output && twitter_compare_elements(l->data, output->data) < 0) {
				continue;
			}

			output = g_slist_insert_sorted(output, l->data, twitter_compare_elements);
		}
	}
	
	if (!(ic->flags & OPT_LOGGED_IN))
		imcb_connected(ic);

	// See if the user wants to see the messages in a groupchat window or as private messages.
	if (g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "chat") == 0)
		twitter_groupchat(ic, output);
	else
		twitter_private_message_chat(ic, output);

	g_slist_free(output);

	txl_free(home_timeline);
	txl_free(mentions);

	td->flags &= ~(TWITTER_DOING_TIMELINE | TWITTER_GOT_TIMELINE | TWITTER_GOT_MENTIONS);
	td->home_timeline_obj = td->mentions_obj = NULL;
}

/**
 * Get the timeline.
 */
void twitter_get_home_timeline(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;

	txl_free(td->home_timeline_obj);
	td->home_timeline_obj = NULL;
	td->flags &= ~TWITTER_GOT_TIMELINE;

	char *args[6];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	args[2] = "include_entities";
	args[3] = "true";
	if (td->timeline_id) {
		args[4] = "since_id";
		args[5] = g_strdup_printf("%llu", (long long unsigned int) td->timeline_id);
	}

	if (twitter_http(ic, TWITTER_HOME_TIMELINE_URL, twitter_http_get_home_timeline, ic, 0, args,
		     td->timeline_id ? 6 : 4) == NULL) {
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
			           TWITTER_HOME_TIMELINE_URL, "connection failed");
		td->flags |= TWITTER_GOT_TIMELINE;
		twitter_flush_timeline(ic);
	}

	g_free(args[1]);
	if (td->timeline_id) {
		g_free(args[5]);
	}
}

/**
 * Get mentions.
 */
void twitter_get_mentions(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;

	txl_free(td->mentions_obj);
	td->mentions_obj = NULL;
	td->flags &= ~TWITTER_GOT_MENTIONS;

	char *args[6];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	args[2] = "include_entities";
	args[3] = "true";
	if (td->timeline_id) {
		args[4] = "since_id";
		args[5] = g_strdup_printf("%llu", (long long unsigned int) td->timeline_id);
	} else {
		args[4] = "count";
		args[5] = g_strdup_printf("%d", set_getint(&ic->acc->set, "show_old_mentions"));
	}

	if (twitter_http(ic, TWITTER_MENTIONS_URL, twitter_http_get_mentions,
	                 ic, 0, args, 6) == NULL) {
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
			           TWITTER_MENTIONS_URL, "connection failed");
		td->flags |= TWITTER_GOT_MENTIONS;
		twitter_flush_timeline(ic);
	}

	g_free(args[1]);
	if (td->timeline_id) {
		g_free(args[5]);
	}
}

/**
 * Callback for getting the home timeline.
 */
static void twitter_http_get_home_timeline(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_node *parsed;
	struct twitter_xml_list *txl;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// The root <statuses> node should hold the list of statuses <status>
	if (!(parsed = twitter_parse_response(ic, req)))
		goto end;
	twitter_xt_get_status_list(ic, parsed, txl);
	xt_free_node(parsed);

	td->home_timeline_obj = txl;

      end:
	td->flags |= TWITTER_GOT_TIMELINE;

	twitter_flush_timeline(ic);
}

/**
 * Callback for getting mentions.
 */
static void twitter_http_get_mentions(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_node *parsed;
	struct twitter_xml_list *txl;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// The root <statuses> node should hold the list of statuses <status>
	if (!(parsed = twitter_parse_response(ic, req)))
		goto end;
	twitter_xt_get_status_list(ic, parsed, txl);
	xt_free_node(parsed);

	td->mentions_obj = txl;

      end:
	td->flags |= TWITTER_GOT_MENTIONS;

	twitter_flush_timeline(ic);
}

/**
 * Callback to use after sending a POST request to twitter.
 * (Generic, used for a few kinds of queries.)
 */
static void twitter_http_post(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_node *parsed, *node;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;
	td->last_status_id = 0;

	if (!(parsed = twitter_parse_response(ic, req)))
		return;
	
	if ((node = xt_find_node(parsed, "status")) &&
	    (node = xt_find_node(node->children, "id")) && node->text)
		td->last_status_id = g_ascii_strtoull(node->text, NULL, 10);
}

/**
 * Function to POST a new status to twitter.
 */
void twitter_post_status(struct im_connection *ic, char *msg, guint64 in_reply_to)
{
	char *args[4] = {
		"status", msg,
		"in_reply_to_status_id",
		g_strdup_printf("%llu", (unsigned long long) in_reply_to)
	};
	twitter_http(ic, TWITTER_STATUS_UPDATE_URL, twitter_http_post, ic, 1,
		     args, in_reply_to ? 4 : 2);
	g_free(args[3]);
}


/**
 * Function to POST a new message to twitter.
 */
void twitter_direct_messages_new(struct im_connection *ic, char *who, char *msg)
{
	char *args[4];
	args[0] = "screen_name";
	args[1] = who;
	args[2] = "text";
	args[3] = msg;
	// Use the same callback as for twitter_post_status, since it does basically the same.
	twitter_http(ic, TWITTER_DIRECT_MESSAGES_NEW_URL, twitter_http_post, ic, 1, args, 4);
}

void twitter_friendships_create_destroy(struct im_connection *ic, char *who, int create)
{
	char *args[2];
	args[0] = "screen_name";
	args[1] = who;
	twitter_http(ic, create ? TWITTER_FRIENDSHIPS_CREATE_URL : TWITTER_FRIENDSHIPS_DESTROY_URL,
		     twitter_http_post, ic, 1, args, 2);
}

void twitter_status_destroy(struct im_connection *ic, guint64 id)
{
	char *url;
	url = g_strdup_printf("%s%llu%s", TWITTER_STATUS_DESTROY_URL,
	                      (unsigned long long) id, ".xml");
	twitter_http(ic, url, twitter_http_post, ic, 1, NULL, 0);
	g_free(url);
}

void twitter_status_retweet(struct im_connection *ic, guint64 id)
{
	char *url;
	url = g_strdup_printf("%s%llu%s", TWITTER_STATUS_RETWEET_URL,
	                      (unsigned long long) id, ".xml");
	twitter_http(ic, url, twitter_http_post, ic, 1, NULL, 0);
	g_free(url);
}

/**
 * Report a user for sending spam.
 */
void twitter_report_spam(struct im_connection *ic, char *screen_name)
{
	char *args[2] = {
		"screen_name",
		NULL,
	};
	args[1] = screen_name;
	twitter_http(ic, TWITTER_REPORT_SPAM_URL, twitter_http_post,
	             ic, 1, args, 2);
}

/**
 * Favourite a tweet.
 */
void twitter_favourite_tweet(struct im_connection *ic, guint64 id)
{
	char *url;
	url = g_strdup_printf("%s%llu%s", TWITTER_FAVORITE_CREATE_URL,
	                      (unsigned long long) id, ".xml");
	twitter_http(ic, url, twitter_http_post, ic, 1, NULL, 0);
	g_free(url);
}