source: lib/oauth2.c @ 106f19c

/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Simple OAuth client (consumer) implementation.                           *
*                                                                           *
*  Copyright 2010-2012 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 <glib.h>
#include "http_client.h"
#include "oauth2.h"
#include "oauth.h"
#include "json.h"
#include "url.h"

char *oauth2_url( const struct oauth2_service *sp )
{
        return g_strconcat( sp->auth_url,
                            "?scope=", sp->scope,
                            "&response_type=code"
                            "&redirect_uri=", sp->redirect_url, 
                            "&client_id=", sp->consumer_key,
                            NULL );
}

struct oauth2_access_token_data
{
        oauth2_token_callback func;
        gpointer data;
};

static void oauth2_access_token_done( struct http_request *req );

int oauth2_access_token( const struct oauth2_service *sp,
                         const char *auth_type, const char *auth,
                         oauth2_token_callback func, gpointer data )
{
        GSList *args = NULL;
        char *args_s, *s;
        url_t url_p;
        struct http_request *req;
        struct oauth2_access_token_data *cb_data;
        
        if( !url_set( &url_p, sp->token_url ) )
                return 0;
        
        oauth_params_add( &args, "client_id", sp->consumer_key );
        oauth_params_add( &args, "client_secret", sp->consumer_secret );
        oauth_params_add( &args, "grant_type", auth_type );
        if( strcmp( auth_type, OAUTH2_AUTH_CODE ) == 0 )
        {
                oauth_params_add( &args, "redirect_uri", sp->redirect_url );
                oauth_params_add( &args, "code", auth );
        }
        else
        {
                oauth_params_add( &args, "refresh_token", auth );
        }
        args_s = oauth_params_string( args );
        oauth_params_free( &args );
        
        s = g_strdup_printf( "POST %s HTTP/1.0\r\n"
                             "Host: %s\r\n"
                             "Content-Type: application/x-www-form-urlencoded\r\n"
                             "Content-Length: %zd\r\n"
                             "Connection: close\r\n"
                             "\r\n"
                             "%s", url_p.file, url_p.host, strlen( args_s ), args_s );
        g_free( args_s );
        
        cb_data = g_new0( struct oauth2_access_token_data, 1 );
        cb_data->func = func;
        cb_data->data = data;
        
        req = http_dorequest( url_p.host, url_p.port, url_p.proto == PROTO_HTTPS,
                              s, oauth2_access_token_done, cb_data );
        
        g_free( s );
        
        if( req == NULL )
                g_free( cb_data );
        
        return req != NULL;
}

static void oauth2_access_token_done( struct http_request *req )
{
        struct oauth2_access_token_data *cb_data = req->data;
        char *atoken = NULL, *rtoken = NULL;
        char *content_type;
        
        if( getenv( "BITLBEE_DEBUG" ) && req->reply_body )
                printf( "%s\n", req->reply_body );
        
        content_type = get_rfc822_header( req->reply_headers, "Content-Type", 0 );
        
        if( req->status_code != 200 )
        {
        }
        else if( content_type && strstr( content_type, "application/json" ) )
        {
                json_value *js = json_parse( req->reply_body );
                if( js && js->type == json_object )
                {
                        int i;
                        
                        for( i = 0; i < js->u.object.length; i ++ )
                        {
                                if( js->u.object.values[i].value->type != json_string )
                                        continue;
                                if( strcmp( js->u.object.values[i].name, "access_token" ) == 0 )
                                        atoken = g_strdup( js->u.object.values[i].value->u.string.ptr );
                                if( strcmp( js->u.object.values[i].name, "refresh_token" ) == 0 )
                                        rtoken = g_strdup( js->u.object.values[i].value->u.string.ptr );
                        }
                }
                json_value_free( js );
        }
        else
        {
                /* Facebook use their own odd format here, seems to be URL-encoded. */
                GSList *p_in = NULL;
                
                oauth_params_parse( &p_in, req->reply_body );
                atoken = g_strdup( oauth_params_get( &p_in, "access_token" ) );
                rtoken = g_strdup( oauth_params_get( &p_in, "refresh_token" ) );
                oauth_params_free( &p_in );
        }
        if( getenv( "BITLBEE_DEBUG" ) )
                printf( "Extracted atoken=%s rtoken=%s\n", atoken, rtoken );
        
        cb_data->func( cb_data->data, atoken, rtoken );
        g_free( content_type );
        g_free( atoken );
        g_free( rtoken );
        g_free( cb_data );
}