facebook chat api 使用

官方API文档： https://developers.facebook.com/docs/chat/

下面是根据文档修改的类：

<?php

class Invite_Chat{
    protected static $_instance = array();
    private $server = 'chat.facebook.com'; // fb xmpp 服务器
    private $access_token = '';

    // FB chat XMPP 标准
    private $STREAM_XML = '<stream:stream
      xmlns:stream="http://etherx.jabber.org/streams"
      version="1.0" xmlns="jabber:client" to="chat.facebook.com"
      xml:lang="en" xmlns:xml="http://www.w3.org/XML/1998/namespace">';

    private $AUTH_XML = '<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl"
      mechanism="X-FACEBOOK-PLATFORM"></auth>';

    private $CLOSE_XML = '</stream:stream>';

    private $RESOURCE_XML = '<iq type="set" id="3">
      <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
      <resource>fb_xmpp_script</resource></bind></iq>';

    private $SESSION_XML = '<iq type="set" id="4" to="chat.facebook.com">
      <session xmlns="urn:ietf:params:xml:ns:xmpp-session"/></iq>';

    private $START_TLS = '<starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>';

    /**
     *
     * @return Invite_Chat
     */
    public static function factory(){
        if( !is_object( self::$_instance['invite_chat'])){
            self::$_instance['invite_chat'] = new Invite_Chat();
        }
        return self::$_instance['invite_chat'];
    }

    /**
     *
     * 获取用户access_token
     * @param unknown_type $from
     */
    public function getAccessToken($from){
        // 根据FB API 获取access token 这里需要自己处理
        return $this->access_token;
    }
    /**
     *
     * 连接xmpp server
     * @param unknown_type $server
     */
    public function open_connection($server){
        $fp = fsockopen($server, 5222, $errno, $errstr);
        if(!$fp){
//            print "$errstr ($errno)<br>";
        }else{
//            print "connnection open<br>";
        }
        return $fp;
    }
    /**
     *
     * 发送xmpp文件流
     * @param unknown_type $fp
     * @param unknown_type $xml
     */
    public function send_xml($fp, $xml){
        fwrite($fp, $xml);
    }
    /**
     *
     * 接收xmpp文件流
     * @param unknown_type $fp
     * @param unknown_type $size
     */
    public function recv_xml($fp,  $size=4096) {
        $xml = fread($fp, $size);
        if (!preg_match('/^</', $xml)) {
            $xml = '<' . $xml;
        }
        if ($xml === "") {
            return null;
        }
        // parses xml
        $xml_parser = xml_parser_create();
        xml_parse_into_struct($xml_parser, $xml, $val, $index);
        xml_parser_free($xml_parser);
        return array($val, $index);
    }
    /**
     *
     * 解析xmpp文件流
     * @param unknown_type $fp
     * @param unknown_type $tag
     * @param unknown_type $value
     * @param unknown_type $ret
     */
    public function find_xmpp($fp,  $tag, $value=null, &$ret=null) {
        static $val = null, $index = null;
        do {
            if ($val === null && $index === null) {
                list($val, $index) = $this->recv_xml($fp);
                if ($val === null || $index === null) {
                return false;
                }
            }
            foreach ($index as $tag_key => $tag_array) {
                if ($tag_key === $tag) {
                    if ($value === null) {
                        if (isset($val[$tag_array[0]]['value'])) {
                            $ret = $val[$tag_array[0]]['value'];
                        }
                        return true;
                    }
                    foreach ($tag_array as $i => $pos) {
                        if ($val[$pos]['tag'] === $tag && isset($val[$pos]['value']) && $val[$pos]['value'] === $value) {
                            $ret = $val[$pos]['value'];
                            return true;
                        }
                    }
                }
            }
            $val = $index = null;

        }while (!feof($fp));
        return false;
    }
    /**
     *
     * xmpp 通信
     * @param unknown_type $options
     * @param unknown_type $access_token
     * @param unknown_type $message
     */
    public function xmpp_connect($options, $access_token, $message){
        $fp = $this->open_connection($options['server']);
        if(!$fp){
            return -1;
        }
        // initiates auth process (using X-FACEBOOK_PLATFORM)
        $this->send_xml($fp, $this->STREAM_XML);
        if(!$this->find_xmpp($fp, 'STREAM:STREAM')){
            return -2;
        }
        if(!$this->find_xmpp($fp, 'MECHANISM', 'X-FACEBOOK-PLATFORM')){
            return -3;
        }

        // starting tls - MANDATORY TO USE OAUTH TOKEN!!!!
        $this->send_xml($fp, $this->START_TLS);
        if(!$this->find_xmpp($fp, 'PROCEED', null, $proceed)){
            return -4;
        }
        stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);

        $this->send_xml($fp, $this->STREAM_XML);
        if(!$this->find_xmpp($fp, 'STREAM:STREAM')){
            return -5;
        }
        if(!$this->find_xmpp($fp, 'MECHANISM', 'X-FACEBOOK-PLATFORM')){
            return -6;
        }

        // gets challenge from server and decode it
        $this->send_xml($fp, $this->AUTH_XML);
        if(!$this->find_xmpp($fp, 'CHALLENGE', null, $challenge)){
            return -7;
        }
        $challenge = base64_decode($challenge);
        $challenge = urldecode($challenge);
        parse_str($challenge, $challenge_array);

        // creates the response array
        $resp_array = array(
            'method' => $challenge_array['method'],
            'nonce' => $challenge_array['nonce'],
            'access_token' => $access_token,
            'api_key' => $options['app_id'],
            'call_id' => 0,
            'v' => '1.0',
        );
        // creates signature
        $response = http_build_query($resp_array);
        // sends the response and waits for success
        $xml = '<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">'.
                base64_encode($response).'</response>';
        $this->send_xml($fp, $xml);
        if (!$this->find_xmpp($fp, 'SUCCESS')) {
            return -8;
        }

        // finishes auth process
        $this->send_xml($fp, $this->STREAM_XML);
        if(!$this->find_xmpp($fp,'STREAM:STREAM')) {
            return -9;
        }
        if(!$this->find_xmpp($fp, 'STREAM:FEATURES')){
            return -10;
        }

        $this->send_xml($fp, $this->RESOURCE_XML);
        if(!$this->find_xmpp($fp, 'JID')){
            return -11;
        }
        $this->send_xml($fp, $this->SESSION_XML);
        if(!$this->find_xmpp($fp, 'SESSION')){
            return -12;
        }

        // send messages
        $this->send_xml($fp, $message);

        // we made it!
        $this->send_xml($fp, $this->CLOSE_XML);
//        print ("Authentication complete<br>");
        fclose($fp);
        return true;
    }
    /**
     *
     * 发送chat 信息
     * @param $from 发送者id
     * @param $to_puid  接收者id
     * @param $message  消息。  例： http://www.google.com 直接输入连接即可
     */
    function chat($from, $to_puid, $message){
        $app_id= '应用appid';
        $app_secret= '应用secret';
        $my_url = '应用app_url';

        $message_xml = '<message  to="-'.$to_puid.'@chat.facebook.com" from="-'.$from.'@chat.facebook.com" >'.
            '<body>'.$message.'</body>'.
            '</message>';

        $options = array(
            'uid' => $from,
            'app_id' => $app_id,
            'server' => $this->server
        );
        $access_token = $this->getAccessToken($from);
        if(empty($access_token)){
            return false;
        }
        if($this->xmpp_connect($options, $access_token, $message_xml) > 0){
            return true;
        }else{
            return false;
        }
    }

} // end class

需要注意的地方：

1. 官方文档没有写明在哪里添加消息发送。如果想了解详情，最好去看看XMPP协议。

2. 使用Chat API 接口，需要先获取Chat 权限。

3. access_token 和官方的获取方式不同，这个可以根据自己的应用的结构进行调整。

获取chat 权限：

js 方法：

function getXmpplogin(){
    FB.ui({ method : 'permissions.request',perms : 'xmpp_login'}, function(r){
        console.log(r);
    });
}

getXmpplogin();

url 方法：

<?php

$appid = '';
$secret = '';
$appurl = '';

$url = 'https://www.facebook.com/dialog/oauth?scope=PERMISSIONS_NAME&client_id=APPID&redirect_uri=APPURL';