An error ocurred in Facebook XMPP

Question

<?php
// Copyright 2004-present Facebook. All Rights Reserved.

$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">';

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

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

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

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

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


function open_connection($server) {
  print "[INFO] Opening connection... ";

  $fp = fsockopen($server, 5222, $errno, $errstr);
  if (!$fp) {
    print "$errstr ($errno)<br>";
  } else {
    print "connnection open<br>";
  }

  return $fp;
}

function send_xml($fp, $xml) {
  fwrite($fp, $xml);
}

function recv_xml($fp,  $size=4096) {
  $xml = fread($fp, $size);
  if ($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);
}

function find_xmpp($fp,  $tag, $value=null, &$ret=null) {
  static $val = null, $index = null;

  do {
    if ($val === null && $index === null) {
      list($val, $index) = recv_xml($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;
}


function xmpp_connect($options, $access_token) {
  global $STREAM_XML, $AUTH_XML, $RESOURCE_XML, $SESSION_XML, $CLOSE_XML, $START_TLS;

  $fp = open_connection($options['server']);
  if (!$fp) {
    return false;
  }

  // initiates auth process (using X-FACEBOOK_PLATFORM)
  send_xml($fp,  $STREAM_XML);
  if (!find_xmpp($fp, 'STREAM:STREAM')) {
    return false;
  }
  if (!find_xmpp($fp,  'MECHANISM', 'X-FACEBOOK-PLATFORM')) {
    return false;
  }

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

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

  // gets challenge from server and decode it
  send_xml($fp, $AUTH_XML);
  if (!find_xmpp($fp,  'CHALLENGE', null, $challenge)) {
    return false;
  }
  $challenge = base64_decode($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>';
  send_xml($fp, $xml);
  if (!find_xmpp($fp, 'SUCCESS')) {
    return false;
  }

  // finishes auth process
  send_xml($fp, $STREAM_XML);
  if (!find_xmpp($fp,'STREAM:STREAM')) {
    return false;
  }
  if (!find_xmpp($fp, 'STREAM:FEATURES')) {
    return false;
  }
 send_xml($fp, $RESOURCE_XML);
  if (!find_xmpp($fp, 'JID')) {
    return false;
  }
  send_xml($fp, $SESSION_XML);
  if (!find_xmpp($fp, 'SESSION')) {
    return false;
  }

  // we made it!
  send_xml($fp, $CLOSE_XML);
  print ("Authentication complete<br>");
  fclose($fp);

  return true;
}



//Gets access_token with xmpp_login permission
function get_access_token($app_id, $app_secret, $my_url){ 

  $code = $_REQUEST["code"];

  if(empty($code)) {
    $dialog_url = "https://www.facebook.com/dialog/oauth?scope=xmpp_login".
     "&client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url) ;
    echo("<script>top.location.href='" . $dialog_url . "'</script>");
  }
   $token_url = "https://graph.facebook.com/oauth/access_token?client_id="
    . $app_id . "&redirect_uri=" . urlencode($my_url) 
    . "&client_secret=" . $app_secret 
    . "&code=" . $code;
   $access_token = file_get_contents($token_url);
    parse_str($access_token, $output);

    return($output['access_token']);
}

function _main() {
  print "Test platform connect for XMPP<br>";
 $app_id='';
  $app_secret='';
  $my_url = "";
  $uid = '';
  $access_token = get_access_token($app_id,$app_secret,$my_url);
  print "access_token: ".$access_token."<br>";

  $options = array(
    'uid' => $uid,
    'app_id' => $app_id,
    'server' => 'chat.facebook.com',
   );

  // prints options used
  print "server: ".$options['server']."<br>";
  print "uid: ".$options['uid']."<br>";
  print "app id: ".$options['app_id']."<br>";

  if (xmpp_connect($options, $access_token)) {
    print "Done<br>";
  } else {
    print "An error ocurred<br>";
  }

}

_main();

??

I am trying to send message to friend using facebook chat API. But the above code gives me this as output,

  Test platform connect for XMPP 
    access_token: **
    server: chat.facebook.com 
    uid: ** 
    app id: **
    [INFO] Opening connection... 
    connnection open
    An error ocurred

After wasting hours on finding the error I found this part returns false,

send_xml($fp, $AUTH_XML);
      if (!find_xmpp($fp,  'CHALLENGE', null, $challenge)) {
        return false;
      }

I still couldn't find a solution. All I want to do is send message to facebook friend. Someone, please help me sending message in facebook via XMPP.

Answer 1

I've been able to reproduce the problem. If you add a debug line to print out the text returned by fread(), you will see that a response from the server is getting split into two pieces:

Piece 1: <

Piece 2: challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>dmVyc2lvbj0xJm1ldGhvZD1hdXRoLnxmwHBfbG2naW4mbm9uY2U9RDI5Qjc1QUZIRORCRkUzOUE5NzYwQ0U5QkNFOUIzREM=</challenge>

I assume this is because the TCP packets are fragmented, but I haven't checked.

One way to deal with this is to modify recv_xml() so that it keeps reading more information until the XML parse returns non-empty data:

function recv_xml($fp,  $size=4096) {
  $xml = fread($fp, $size);
  if ($xml === "") {
     return null;
  }

  // parses xml
  $xml_parser = xml_parser_create();
  xml_parse_into_struct($xml_parser, $xml, $val, $index);
  xml_parser_free($xml_parser);
  while (count($val) == 0) {
    // The parse failed.  We probably got a partial packet.  Read more
    $xml .= fread($fp, $size);
    // Have to create a new parser each time the XML changes.
    $xml_parser = xml_parser_create();
    xml_parse_into_struct($xml_parser, $xml, $val, $index);
    xml_parser_free($xml_parser);
  }

  return array($val, $index);
}

Edward Komissarov's answer should also fix the problem, since he directly adds that missing angular bracket. The code I have provided should work even if the split happens somewhere else.

It's worth recognizing that the overall code is still quite brittle; it appears to be a proof of concept and not production-ready.

Answer 2

In the function recv_xml replace

 $xml = fread($fp, $size);

to

 $xml = fread($fp, $size);

 if (!preg_match('/^</', $xml)) {
       $xml = '<' . $xml;
 }