post to StatusNet addon for Friendika

addon/statusnet/OAuth.php

@@ -0,0 +1,874 @@
+<?php
+// vim: foldmethod=marker
+
+/* Generic exception class
+ */
+class OAuthException extends Exception {
+  // pass
+}
+
+class OAuthConsumer {
+  public $key;
+  public $secret;
+
+  function __construct($key, $secret, $callback_url=NULL) {
+    $this->key = $key;
+    $this->secret = $secret;
+    $this->callback_url = $callback_url;
+  }
+
+  function __toString() {
+    return "OAuthConsumer[key=$this->key,secret=$this->secret]";
+  }
+}
+
+class OAuthToken {
+  // access tokens and request tokens
+  public $key;
+  public $secret;
+
+  /**
+   * key = the token
+   * secret = the token secret
+   */
+  function __construct($key, $secret) {
+    $this->key = $key;
+    $this->secret = $secret;
+  }
+
+  /**
+   * generates the basic string serialization of a token that a server
+   * would respond to request_token and access_token calls with
+   */
+  function to_string() {
+    return "oauth_token=" .
+           OAuthUtil::urlencode_rfc3986($this->key) .
+           "&oauth_token_secret=" .
+           OAuthUtil::urlencode_rfc3986($this->secret);
+  }
+
+  function __toString() {
+    return $this->to_string();
+  }
+}
+
+/**
+ * A class for implementing a Signature Method
+ * See section 9 ("Signing Requests") in the spec
+ */
+abstract class OAuthSignatureMethod {
+  /**
+   * Needs to return the name of the Signature Method (ie HMAC-SHA1)
+   * @return string
+   */
+  abstract public function get_name();
+
+  /**
+   * Build up the signature
+   * NOTE: The output of this function MUST NOT be urlencoded.
+   * the encoding is handled in OAuthRequest when the final
+   * request is serialized
+   * @param OAuthRequest $request
+   * @param OAuthConsumer $consumer
+   * @param OAuthToken $token
+   * @return string
+   */
+  abstract public function build_signature($request, $consumer, $token);
+
+  /**
+   * Verifies that a given signature is correct
+   * @param OAuthRequest $request
+   * @param OAuthConsumer $consumer
+   * @param OAuthToken $token
+   * @param string $signature
+   * @return bool
+   */
+  public function check_signature($request, $consumer, $token, $signature) {
+    $built = $this->build_signature($request, $consumer, $token);
+    return $built == $signature;
+  }
+}
+
+/**
+ * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104] 
+ * where the Signature Base String is the text and the key is the concatenated values (each first 
+ * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&' 
+ * character (ASCII code 38) even if empty.
+ *   - Chapter 9.2 ("HMAC-SHA1")
+ */
+class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
+  function get_name() {
+    return "HMAC-SHA1";
+  }
+
+  public function build_signature($request, $consumer, $token) {
+    $base_string = $request->get_signature_base_string();
+    $request->base_string = $base_string;
+
+    $key_parts = array(
+      $consumer->secret,
+      ($token) ? $token->secret : ""
+    );
+
+    $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
+    $key = implode('&', $key_parts);
+
+    return base64_encode(hash_hmac('sha1', $base_string, $key, true));
+  }
+}
+
+/**
+ * The PLAINTEXT method does not provide any security protection and SHOULD only be used 
+ * over a secure channel such as HTTPS. It does not use the Signature Base String.
+ *   - Chapter 9.4 ("PLAINTEXT")
+ */
+class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
+  public function get_name() {
+    return "PLAINTEXT";
+  }
+
+  /**
+   * oauth_signature is set to the concatenated encoded values of the Consumer Secret and 
+   * Token Secret, separated by a '&' character (ASCII code 38), even if either secret is 
+   * empty. The result MUST be encoded again.
+   *   - Chapter 9.4.1 ("Generating Signatures")
+   *
+   * Please note that the second encoding MUST NOT happen in the SignatureMethod, as
+   * OAuthRequest handles this!
+   */
+  public function build_signature($request, $consumer, $token) {
+    $key_parts = array(
+      $consumer->secret,
+      ($token) ? $token->secret : ""
+    );
+
+    $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
+    $key = implode('&', $key_parts);
+    $request->base_string = $key;
+
+    return $key;
+  }
+}
+
+/**
+ * The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in 
+ * [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for 
+ * EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a 
+ * verified way to the Service Provider, in a manner which is beyond the scope of this 
+ * specification.
+ *   - Chapter 9.3 ("RSA-SHA1")
+ */
+abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
+  public function get_name() {
+    return "RSA-SHA1";
+  }
+
+  // Up to the SP to implement this lookup of keys. Possible ideas are:
+  // (1) do a lookup in a table of trusted certs keyed off of consumer
+  // (2) fetch via http using a url provided by the requester
+  // (3) some sort of specific discovery code based on request
+  //
+  // Either way should return a string representation of the certificate
+  protected abstract function fetch_public_cert(&$request);
+
+  // Up to the SP to implement this lookup of keys. Possible ideas are:
+  // (1) do a lookup in a table of trusted certs keyed off of consumer
+  //
+  // Either way should return a string representation of the certificate
+  protected abstract function fetch_private_cert(&$request);
+
+  public function build_signature($request, $consumer, $token) {
+    $base_string = $request->get_signature_base_string();
+    $request->base_string = $base_string;
+
+    // Fetch the private key cert based on the request
+    $cert = $this->fetch_private_cert($request);
+
+    // Pull the private key ID from the certificate
+    $privatekeyid = openssl_get_privatekey($cert);
+
+    // Sign using the key
+    $ok = openssl_sign($base_string, $signature, $privatekeyid);
+
+    // Release the key resource
+    openssl_free_key($privatekeyid);
+
+    return base64_encode($signature);
+  }
+
+  public function check_signature($request, $consumer, $token, $signature) {
+    $decoded_sig = base64_decode($signature);
+
+    $base_string = $request->get_signature_base_string();
+
+    // Fetch the public key cert based on the request
+    $cert = $this->fetch_public_cert($request);
+
+    // Pull the public key ID from the certificate
+    $publickeyid = openssl_get_publickey($cert);
+
+    // Check the computed signature against the one passed in the query
+    $ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
+
+    // Release the key resource
+    openssl_free_key($publickeyid);
+
+    return $ok == 1;
+  }
+}
+
+class OAuthRequest {
+  private $parameters;
+  private $http_method;
+  private $http_url;
+  // for debug purposes
+  public $base_string;
+  public static $version = '1.0';
+  public static $POST_INPUT = 'php://input';
+
+  function __construct($http_method, $http_url, $parameters=NULL) {
+    @$parameters or $parameters = array();
+    $parameters = array_merge( OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
+    $this->parameters = $parameters;
+    $this->http_method = $http_method;
+    $this->http_url = $http_url;
+  }
+
+
+  /**
+   * attempt to build up a request from what was passed to the server
+   */
+  public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {
+    $scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
+              ? 'http'
+              : 'https';
+    @$http_url or $http_url = $scheme .
+                              '://' . $_SERVER['HTTP_HOST'] .
+                              ':' .
+                              $_SERVER['SERVER_PORT'] .
+                              $_SERVER['REQUEST_URI'];
+    @$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
+
+    // We weren't handed any parameters, so let's find the ones relevant to
+    // this request.
+    // If you run XML-RPC or similar you should use this to provide your own
+    // parsed parameter-list
+    if (!$parameters) {
+      // Find request headers
+      $request_headers = OAuthUtil::get_headers();
+
+      // Parse the query-string to find GET parameters
+      $parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
+
+      // It's a POST request of the proper content-type, so parse POST
+      // parameters and add those overriding any duplicates from GET
+      if ($http_method == "POST"
+          && @strstr($request_headers["Content-Type"],
+                     "application/x-www-form-urlencoded")
+          ) {
+        $post_data = OAuthUtil::parse_parameters(
+          file_get_contents(self::$POST_INPUT)
+        );
+        $parameters = array_merge($parameters, $post_data);
+      }
+
+      // We have a Authorization-header with OAuth data. Parse the header
+      // and add those overriding any duplicates from GET or POST
+      if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
+        $header_parameters = OAuthUtil::split_header(
+          $request_headers['Authorization']
+        );
+        $parameters = array_merge($parameters, $header_parameters);
+      }
+
+    }
+
+    return new OAuthRequest($http_method, $http_url, $parameters);
+  }
+
+  /**
+   * pretty much a helper function to set up the request
+   */
+  public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {
+    @$parameters or $parameters = array();
+    $defaults = array("oauth_version" => OAuthRequest::$version,
+                      "oauth_nonce" => OAuthRequest::generate_nonce(),
+                      "oauth_timestamp" => OAuthRequest::generate_timestamp(),
+                      "oauth_consumer_key" => $consumer->key);
+    if ($token)
+      $defaults['oauth_token'] = $token->key;
+
+    $parameters = array_merge($defaults, $parameters);
+
+    return new OAuthRequest($http_method, $http_url, $parameters);
+  }
+
+  public function set_parameter($name, $value, $allow_duplicates = true) {
+    if ($allow_duplicates && isset($this->parameters[$name])) {
+      // We have already added parameter(s) with this name, so add to the list
+      if (is_scalar($this->parameters[$name])) {
+        // This is the first duplicate, so transform scalar (string)
+        // into an array so we can add the duplicates
+        $this->parameters[$name] = array($this->parameters[$name]);
+      }
+
+      $this->parameters[$name][] = $value;
+    } else {
+      $this->parameters[$name] = $value;
+    }
+  }
+
+  public function get_parameter($name) {
+    return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
+  }
+
+  public function get_parameters() {
+    return $this->parameters;
+  }
+
+  public function unset_parameter($name) {
+    unset($this->parameters[$name]);
+  }
+
+  /**
+   * The request parameters, sorted and concatenated into a normalized string.
+   * @return string
+   */
+  public function get_signable_parameters() {
+    // Grab all parameters
+    $params = $this->parameters;
+
+    // Remove oauth_signature if present
+    // Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
+    if (isset($params['oauth_signature'])) {
+      unset($params['oauth_signature']);
+    }
+
+    return OAuthUtil::build_http_query($params);
+  }
+
+  /**
+   * Returns the base string of this request
+   *
+   * The base string defined as the method, the url
+   * and the parameters (normalized), each urlencoded
+   * and the concated with &.
+   */
+  public function get_signature_base_string() {
+    $parts = array(
+      $this->get_normalized_http_method(),
+      $this->get_normalized_http_url(),
+      $this->get_signable_parameters()
+    );
+
+    $parts = OAuthUtil::urlencode_rfc3986($parts);
+
+    return implode('&', $parts);
+  }
+
+  /**
+   * just uppercases the http method
+   */
+  public function get_normalized_http_method() {
+    return strtoupper($this->http_method);
+  }
+
+  /**
+   * parses the url and rebuilds it to be
+   * scheme://host/path
+   */
+  public function get_normalized_http_url() {
+    $parts = parse_url($this->http_url);
+
+    $port = @$parts['port'];
+    $scheme = $parts['scheme'];
+    $host = $parts['host'];
+    $path = @$parts['path'];
+
+    $port or $port = ($scheme == 'https') ? '443' : '80';
+
+    if (($scheme == 'https' && $port != '443')
+        || ($scheme == 'http' && $port != '80')) {
+      $host = "$host:$port";
+    }
+    return "$scheme://$host$path";
+  }
+
+  /**
+   * builds a url usable for a GET request
+   */
+  public function to_url() {
+    $post_data = $this->to_postdata();
+    $out = $this->get_normalized_http_url();
+    if ($post_data) {
+      $out .= '?'.$post_data;
+    }
+    return $out;
+  }
+
+  /**
+   * builds the data one would send in a POST request
+   */
+  public function to_postdata() {
+    return OAuthUtil::build_http_query($this->parameters);
+  }
+
+  /**
+   * builds the Authorization: header
+   */
+  public function to_header($realm=null) {
+    $first = true;
+	if($realm) {
+      $out = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
+      $first = false;
+    } else
+      $out = 'Authorization: OAuth';
+
+    $total = array();
+    foreach ($this->parameters as $k => $v) {
+      if (substr($k, 0, 5) != "oauth") continue;
+      if (is_array($v)) {
+        throw new OAuthException('Arrays not supported in headers');
+      }
+      $out .= ($first) ? ' ' : ',';
+      $out .= OAuthUtil::urlencode_rfc3986($k) .
+              '="' .
+              OAuthUtil::urlencode_rfc3986($v) .
+              '"';
+      $first = false;
+    }
+    return $out;
+  }
+
+  public function __toString() {
+    return $this->to_url();
+  }
+
+
+  public function sign_request($signature_method, $consumer, $token) {
+    $this->set_parameter(
+      "oauth_signature_method",
+      $signature_method->get_name(),
+      false
+    );
+    $signature = $this->build_signature($signature_method, $consumer, $token);
+    $this->set_parameter("oauth_signature", $signature, false);
+  }
+
+  public function build_signature($signature_method, $consumer, $token) {
+    $signature = $signature_method->build_signature($this, $consumer, $token);
+    return $signature;
+  }
+
+  /**
+   * util function: current timestamp
+   */
+  private static function generate_timestamp() {
+    return time();
+  }
+
+  /**
+   * util function: current nonce
+   */
+  private static function generate_nonce() {
+    $mt = microtime();
+    $rand = mt_rand();
+
+    return md5($mt . $rand); // md5s look nicer than numbers
+  }
+}
+
+class OAuthServer {
+  protected $timestamp_threshold = 300; // in seconds, five minutes
+  protected $version = '1.0';             // hi blaine
+  protected $signature_methods = array();
+
+  protected $data_store;
+
+  function __construct($data_store) {
+    $this->data_store = $data_store;
+  }
+
+  public function add_signature_method($signature_method) {
+    $this->signature_methods[$signature_method->get_name()] =
+      $signature_method;
+  }
+
+  // high level functions
+
+  /**
+   * process a request_token request
+   * returns the request token on success
+   */
+  public function fetch_request_token(&$request) {
+    $this->get_version($request);
+
+    $consumer = $this->get_consumer($request);
+
+    // no token required for the initial token request
+    $token = NULL;
+
+    $this->check_signature($request, $consumer, $token);
+
+    // Rev A change
+    $callback = $request->get_parameter('oauth_callback');
+    $new_token = $this->data_store->new_request_token($consumer, $callback);
+
+    return $new_token;
+  }
+
+  /**
+   * process an access_token request
+   * returns the access token on success
+   */
+  public function fetch_access_token(&$request) {
+    $this->get_version($request);
+
+    $consumer = $this->get_consumer($request);
+
+    // requires authorized request token
+    $token = $this->get_token($request, $consumer, "request");
+
+    $this->check_signature($request, $consumer, $token);
+
+    // Rev A change
+    $verifier = $request->get_parameter('oauth_verifier');
+    $new_token = $this->data_store->new_access_token($token, $consumer, $verifier);
+
+    return $new_token;
+  }
+
+  /**
+   * verify an api call, checks all the parameters
+   */
+  public function verify_request(&$request) {
+    $this->get_version($request);
+    $consumer = $this->get_consumer($request);
+    $token = $this->get_token($request, $consumer, "access");
+    $this->check_signature($request, $consumer, $token);
+    return array($consumer, $token);
+  }
+
+  // Internals from here
+  /**
+   * version 1
+   */
+  private function get_version(&$request) {
+    $version = $request->get_parameter("oauth_version");
+    if (!$version) {
+      // Service Providers MUST assume the protocol version to be 1.0 if this parameter is not present. 
+      // Chapter 7.0 ("Accessing Protected Ressources")
+      $version = '1.0';
+    }
+    if ($version !== $this->version) {
+      throw new OAuthException("OAuth version '$version' not supported");
+    }
+    return $version;
+  }
+
+  /**
+   * figure out the signature with some defaults
+   */
+  private function get_signature_method(&$request) {
+    $signature_method =
+        @$request->get_parameter("oauth_signature_method");
+
+    if (!$signature_method) {
+      // According to chapter 7 ("Accessing Protected Ressources") the signature-method
+      // parameter is required, and we can't just fallback to PLAINTEXT
+      throw new OAuthException('No signature method parameter. This parameter is required');
+    }
+
+    if (!in_array($signature_method,
+                  array_keys($this->signature_methods))) {
+      throw new OAuthException(
+        "Signature method '$signature_method' not supported " .
+        "try one of the following: " .
+        implode(", ", array_keys($this->signature_methods))
+      );
+    }
+    return $this->signature_methods[$signature_method];
+  }
+
+  /**
+   * try to find the consumer for the provided request's consumer key
+   */
+  private function get_consumer(&$request) {
+    $consumer_key = @$request->get_parameter("oauth_consumer_key");
+    if (!$consumer_key) {
+      throw new OAuthException("Invalid consumer key");
+    }
+
+    $consumer = $this->data_store->lookup_consumer($consumer_key);
+    if (!$consumer) {
+      throw new OAuthException("Invalid consumer");
+    }
+
+    return $consumer;
+  }
+
+  /**
+   * try to find the token for the provided request's token key
+   */
+  private function get_token(&$request, $consumer, $token_type="access") {
+    $token_field = @$request->get_parameter('oauth_token');
+    $token = $this->data_store->lookup_token(
+      $consumer, $token_type, $token_field
+    );
+    if (!$token) {
+      throw new OAuthException("Invalid $token_type token: $token_field");
+    }
+    return $token;
+  }
+
+  /**
+   * all-in-one function to check the signature on a request
+   * should guess the signature method appropriately
+   */
+  private function check_signature(&$request, $consumer, $token) {
+    // this should probably be in a different method
+    $timestamp = @$request->get_parameter('oauth_timestamp');
+    $nonce = @$request->get_parameter('oauth_nonce');
+
+    $this->check_timestamp($timestamp);
+    $this->check_nonce($consumer, $token, $nonce, $timestamp);
+
+    $signature_method = $this->get_signature_method($request);
+
+    $signature = $request->get_parameter('oauth_signature');
+    $valid_sig = $signature_method->check_signature(
+      $request,
+      $consumer,
+      $token,
+      $signature
+    );
+
+    if (!$valid_sig) {
+      throw new OAuthException("Invalid signature");
+    }
+  }
+
+  /**
+   * check that the timestamp is new enough
+   */
+  private function check_timestamp($timestamp) {
+    if( ! $timestamp )
+      throw new OAuthException(
+        'Missing timestamp parameter. The parameter is required'
+      );
+    
+    // verify that timestamp is recentish
+    $now = time();
+    if (abs($now - $timestamp) > $this->timestamp_threshold) {
+      throw new OAuthException(
+        "Expired timestamp, yours $timestamp, ours $now"
+      );
+    }
+  }
+
+  /**
+   * check that the nonce is not repeated
+   */
+  private function check_nonce($consumer, $token, $nonce, $timestamp) {
+    if( ! $nonce )
+      throw new OAuthException(
+        'Missing nonce parameter. The parameter is required'
+      );
+
+    // verify that the nonce is uniqueish
+    $found = $this->data_store->lookup_nonce(
+      $consumer,
+      $token,
+      $nonce,
+      $timestamp
+    );
+    if ($found) {
+      throw new OAuthException("Nonce already used: $nonce");
+    }
+  }
+
+}
+
+class OAuthDataStore {
+  function lookup_consumer($consumer_key) {
+    // implement me
+  }
+
+  function lookup_token($consumer, $token_type, $token) {
+    // implement me
+  }
+
+  function lookup_nonce($consumer, $token, $nonce, $timestamp) {
+    // implement me
+  }
+
+  function new_request_token($consumer, $callback = null) {
+    // return a new token attached to this consumer
+  }
+
+  function new_access_token($token, $consumer, $verifier = null) {
+    // return a new access token attached to this consumer
+    // for the user associated with this token if the request token
+    // is authorized
+    // should also invalidate the request token
+  }
+
+}
+
+class OAuthUtil {
+  public static function urlencode_rfc3986($input) {
+  if (is_array($input)) {
+    return array_map(array('OAuthUtil', 'urlencode_rfc3986'), $input);
+  } else if (is_scalar($input)) {
+    return str_replace(
+      '+',
+      ' ',
+      str_replace('%7E', '~', rawurlencode($input))
+    );
+  } else {
+    return '';
+  }
+}
+
+
+  // This decode function isn't taking into consideration the above
+  // modifications to the encoding process. However, this method doesn't
+  // seem to be used anywhere so leaving it as is.
+  public static function urldecode_rfc3986($string) {
+    return urldecode($string);
+  }
+
+  // Utility function for turning the Authorization: header into
+  // parameters, has to do some unescaping
+  // Can filter out any non-oauth parameters if needed (default behaviour)
+  public static function split_header($header, $only_allow_oauth_parameters = true) {
+    $pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
+    $offset = 0;
+    $params = array();
+    while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
+      $match = $matches[0];
+      $header_name = $matches[2][0];
+      $header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
+      if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
+        $params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
+      }
+      $offset = $match[1] + strlen($match[0]);
+    }
+
+    if (isset($params['realm'])) {
+      unset($params['realm']);
+    }
+
+    return $params;
+  }
+
+  // helper to try to sort out headers for people who aren't running apache
+  public static function get_headers() {
+    if (function_exists('apache_request_headers')) {
+      // we need this to get the actual Authorization: header
+      // because apache tends to tell us it doesn't exist
+      $headers = apache_request_headers();
+
+      // sanitize the output of apache_request_headers because
+      // we always want the keys to be Cased-Like-This and arh()
+      // returns the headers in the same case as they are in the
+      // request
+      $out = array();
+      foreach( $headers AS $key => $value ) {
+        $key = str_replace(
+            " ",
+            "-",
+            ucwords(strtolower(str_replace("-", " ", $key)))
+          );
+        $out[$key] = $value;
+      }
+    } else {
+      // otherwise we don't have apache and are just going to have to hope
+      // that $_SERVER actually contains what we need
+      $out = array();
+      if( isset($_SERVER['CONTENT_TYPE']) )
+        $out['Content-Type'] = $_SERVER['CONTENT_TYPE'];
+      if( isset($_ENV['CONTENT_TYPE']) )
+        $out['Content-Type'] = $_ENV['CONTENT_TYPE'];
+
+      foreach ($_SERVER as $key => $value) {
+        if (substr($key, 0, 5) == "HTTP_") {
+          // this is chaos, basically it is just there to capitalize the first
+          // letter of every word that is not an initial HTTP and strip HTTP
+          // code from przemek
+          $key = str_replace(
+            " ",
+            "-",
+            ucwords(strtolower(str_replace("_", " ", substr($key, 5))))
+          );
+          $out[$key] = $value;
+        }
+      }
+    }
+    return $out;
+  }
+
+  // This function takes a input like a=b&a=c&d=e and returns the parsed
+  // parameters like this
+  // array('a' => array('b','c'), 'd' => 'e')
+  public static function parse_parameters( $input ) {
+    if (!isset($input) || !$input) return array();
+
+    $pairs = explode('&', $input);
+
+    $parsed_parameters = array();
+    foreach ($pairs as $pair) {
+      $split = explode('=', $pair, 2);
+      $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
+      $value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';
+
+      if (isset($parsed_parameters[$parameter])) {
+        // We have already recieved parameter(s) with this name, so add to the list
+        // of parameters with this name
+
+        if (is_scalar($parsed_parameters[$parameter])) {
+          // This is the first duplicate, so transform scalar (string) into an array
+          // so we can add the duplicates
+          $parsed_parameters[$parameter] = array($parsed_parameters[$parameter]);
+        }
+
+        $parsed_parameters[$parameter][] = $value;
+      } else {
+        $parsed_parameters[$parameter] = $value;
+      }
+    }
+    return $parsed_parameters;
+  }
+
+  public static function build_http_query($params) {
+    if (!$params) return '';
+
+    // Urlencode both keys and values
+    $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
+    $values = OAuthUtil::urlencode_rfc3986(array_values($params));
+    $params = array_combine($keys, $values);
+
+    // Parameters are sorted by name, using lexicographical byte value ordering.
+    // Ref: Spec: 9.1.1 (1)
+    uksort($params, 'strcmp');
+
+    $pairs = array();
+    foreach ($params as $parameter => $value) {
+      if (is_array($value)) {
+        // If two or more parameters share the same name, they are sorted by their value
+        // Ref: Spec: 9.1.1 (1)
+        natsort($value);
+        foreach ($value as $duplicate_value) {
+          $pairs[] = $parameter . '=' . $duplicate_value;
+        }
+      } else {
+        $pairs[] = $parameter . '=' . $value;
+      }
+    }
+    // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
+    // Each name-value pair is separated by an '&' character (ASCII code 38)
+    return implode('&', $pairs);
+  }
+}
+
+?>

addon/statusnet/slinky.php

@@ -0,0 +1,704 @@
+<?php
+/*
+Copyright (c) 2009, Beau Lebens
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ - Redistributions of source code must retain the above copyright notice, this 
+   list of conditions and the following disclaimer.
+ - Redistributions in binary form must reproduce the above copyright notice, 
+   this list of conditions and the following disclaimer in the documentation 
+   and/or other materials provided with the distribution.
+ - Neither the name of Dented Reality nor the names of the authors may be used 
+   to endorse or promote products derived from this software without specific 
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND	ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+	
+*/
+
+// Return options for Slinky_Service->url_get() and ->url_post()
+define( 'SLINKY_BODY', 1 ); // Default
+define( 'SLINKY_HEADERS', 2 ); // Not implemented yet
+define( 'SLINKY_FINAL_URL', 3 ); // Default for lengthening URLs
+
+// So that services may decide what to do with us
+define( 'SLINKY_USER_AGENT', 'Slinky v1.0 +http://dentedreality.com.au/projects/slinky/' );
+
+// How many seconds until remote requests should be cut?
+define( 'SLINKY_TIMEOUT', 10 );
+
+/**
+ * Slinky allows you to go back and forth between "long" and shortened URLs 
+ * using popular URL shortening services.
+ * 
+ * Slinky assumes you have cURL installed and working, and requires the JSON
+ * extension installed if you're working with a service that uses JSON.
+ * 
+ * Slinky will ONLY work with PHP5+
+ * 
+ * It supports some of the more popular services, with easy extensibility for
+ * adding your own relatively easily. It defaults to using TinyURL
+ * for shortening URLs. If you want to use some of the other services, you need
+ * to set some configuration options before actually shortening/lengthening
+ * URLs. I'd strongly suggest that you cache results using memcached, a local
+ * DB or whatever to avoid having to hit APIs etc every time you encounter a
+ * URL.
+ * 
+ * Slinky supports shortening, and auto-detection (for lengthening URLs) 
+ * using these services:
+ * - Bit.ly
+ * - Tr.im
+ * - TinyURL
+ * - Is.Gd
+ * - Fon.gs
+ * - Micurl.com
+ * - ur1.ca
+ * - Ptiturl
+ * - Tighturl
+ * - 2tu.us
+ * - Snipr / Snipurl / Snurl.com / Sn.im
+ * 
+ * 
+ * To use Slinky:
+ * 
+ * $slinky = new Slinky( 'http://dentedreality.com.au/' );
+ * - Creates a new Slinky instance, will default to using TinyURL for ->short();
+ * 
+ * $slinky = new Slinky( 'http://dentedreality.com.au', new Slinky_Bitly() );
+ * - Creates new Slinky, forces use of Bit.ly for ->short();
+ * 
+ * $slinky = new Slinky( 'http://dentedreality.com.au/' );
+ * echo $slinky->short();
+ * - echos the short version of http://dentedreality.com.au/ (default to TinyURL)
+ * 
+ * $slinky = new Slinky( 'http://tinyurl.com/jw5sh' );
+ * echo $slinky->long();
+ * - echos out the long version of http://tinyurl.com/jw5sh (which should be http://dentedreality.com.au/)
+ * 
+ * $slinky = new Slinky( 'http://dentedreality.com.au/' );
+ * echo $slinky->long();
+ * - Attempts to lengthen the URL, but will not auto-detect which service it is
+ *   so it will just output the original URL. Useful for always attempting to
+ *   lengthen any URL you come across (fails gracefully)
+ * 
+ * $slinky = new Slinky( 'http://dentedreality.com.au/' );
+ * $slinky->set_cascade( array( new Slinky_Trim(), new Slinky_IsGd(), new Slinky_TinyURL() ) );
+ * echo $slinky->short();
+ * - Uses the powerful cascade mode to make sure that we get a short URL from 
+ *   Tr.im, Is.Gd or TinyURL (in that order).
+ * 
+ * See specific service class definitions below for examples of how to use them,
+ * as some services allow (or require) additional properties before you can use
+ * them (for authentication etc).
+ * 
+ * To use a different service with Slinky, just create your own class and
+ * extend Slinky_Service(). Make sure you implement url_is_short(), url_is_long(),
+ * make_short() and make_long(). If you need to GET or POST a URL, you can use
+ * ->url_get() and ->url_post(), which your class will have inherited.
+**/
+class Slinky {
+	var $url     = false;
+	var $service = false;
+	var $cascade = false;
+	
+	function __construct( $url = false, $service = false ) {
+		$this->url     = $url;
+		$this->service = $service;
+	}
+	
+	/**
+	 * Specify which URL Service to use
+	 *
+	 * @param Slinky_Service $service Packaged or custom Service object
+	 * @return void
+	 */
+	public function set_service( $service = false ) {
+		if ( is_object( $service ) ) {
+			$this->service = $service;
+		}
+	}
+	
+	/**
+	 * If you pass an array of Slinky_Service objects to this method, they will
+	 * be used in order to try to get a short URL, so if one fails, it will
+	 * try the next and so on, until it gets a valid short URL, or it runs
+	 * out of options.
+	 * 
+	 * @param array $services List of Slinky_Service objects as an array
+	**/
+	public function set_cascade( $services = false ) {
+		if ( !$services || !is_array( $services ) )
+			return false;
+		
+		$this->cascade = $services;
+	}
+	
+	/**
+	 * Guess the URL service to use from known domains of short URLs
+	 *
+	 * @param string $url 
+	 */
+	public function set_service_from_url( $url = false ) {
+		if ( !$url )
+			$url = $this->url;
+		
+		$host = parse_url( $url, PHP_URL_HOST );
+		switch ( str_replace( 'www.', '', $host ) ) {
+			case 'bit.ly':
+				if ( class_exists( 'Slinky_Bitly' ) ) {
+					$this->service = new Slinky_Bitly();
+					break;
+				}
+			case 'tr.im':
+				if ( class_exists( 'Slinky_Trim' ) ) {
+					$this->service = new Slinky_Trim();
+					break;
+				}
+			case 'tinyurl.com':
+				if ( class_exists( 'Slinky_TinyURL' ) ) {
+					$this->service = new Slinky_TinyURL();
+					break;
+				}
+			case 'is.gd':
+				if ( class_exists( 'Slinky_IsGd' ) ) {
+					$this->service = new Slinky_IsGd();
+					break;
+				}
+			case 'fon.gs':
+				if ( class_exists( 'Slinky_Fongs' ) ) {
+					$this->service = new Slinky_Fongs();
+					break;
+				}
+			case 'micurl.com':
+				if ( class_exists( 'Slinky_Micurl' ) ) {
+					$this->service = new Slinky_Micurl();
+					break;
+				}
+			case 'ur1.ca':
+				if ( class_exists( 'Slinky_Ur1ca' ) ) {
+					$this->service = new Slinky_Ur1ca();
+					break;
+				}
+			case 'ptiturl.com':
+				if ( class_exists( 'Slinky_PtitURL' ) ) {
+					$this->service = new Slinky_PtitURL();
+					break;
+				}
+			case 'tighturl.com':
+			case '2tu.us':
+				if ( class_exists( 'Slinky_TightURL' ) ) {
+					$this->service = new Slinky_TightURL();
+					break;
+				}
+			case 'snipr.com':
+			case 'snipurl.com':
+			case 'snurl.com':
+			case 'sn.im':
+				if ( class_exists( 'Slinky_Snipr' ) ) {
+					$this->service = new Slinky_Snipr();
+					break;
+				}
+			default:
+				$this->service = new Slinky_Default();
+				break;
+		}
+	}
+	
+	/**
+	 * Take a long URL and make it short. Will avoid "re-shortening" a URL if it
+	 * already seems to be short.
+	 *
+	 * @param string $url Optional URL to shorten, otherwise use $this->url
+	 * @return The short version of the URL
+	 */
+	public function short( $url = false ) {
+		if ( $url )
+			$this->url = $url;
+			
+		if ( !$this->service )
+			$this->set_service( new Slinky_TinyURL() ); // Defaults to tinyurl because it doesn't require any configuration
+		
+		if ( !$this->cascade )
+			$this->cascade = array( $this->service ); // Use a single service in cascade mode
+		
+		foreach ( $this->cascade as $service ) {
+			if ( $service->url_is_short( $this->url ) )
+				return trim( $this->url ); // Identified as already short, using this service
+
+			$response = trim( $service->make_short( $this->url ) );
+			if ( $response && $this->url != $response )
+				return trim( $response );
+		}
+		
+		return $this->url; // If all else fails, just send back the URL we already know about
+	}
+	
+	/**
+	 * Take a short URL and make it long ("resolve" it).
+	 *
+	 * @param string $url The short URL
+	 * @return A long URL
+	 */
+	public function long( $url = false ) {
+		if ( $url )
+			$this->url = $url;
+			
+		if ( !$this->service )
+			$this->set_service_from_url();
+		
+		if ( $this->service->url_is_long( $this->url ) )
+			return trim( $this->url );
+		
+		return trim( $this->service->make_long( $this->url ) );
+	}
+}
+
+/**
+ * Use this class to create a Service implementation for your own URL 
+ * shortening service. Extend the class and customize methods to suit your 
+ * service. Note that it is an "abstract" class, so there are certain methods 
+ * which you *must* define.
+**/
+abstract class Slinky_Service {
+	
+	/**
+	 * Determine, based on the input URL, if it's already a short URL, from
+	 * this particular service. e.g. a Bit.ly URL contains "bit.ly/"
+	**/
+	abstract function url_is_short( $url );
+	
+	/**
+	 * Determine if this is a "long" URL (just means it hasn't been shortened)
+	 * already. e.g. a no-Bit.ly URL would NOT contain "bit.ly/"
+	**/
+	abstract function url_is_long( $url );
+	
+	/**
+	 * Handle taking the $url and converting it to a short URL via whatever
+	 * means is provided at the remote service.
+	**/
+	abstract function make_short( $url );
+	
+	/**
+	 * Return the long/expanded version of a URL via any API means available
+	 * from this service. As a fallback, you might
+	 * consider just following the URL and using SLINKY_FINAL_URL as the 
+	 * return method from a $this->url_get() call to find out.
+	 * 
+	 * This one is optional for Services extending this class, if they don't
+	 * then the following implementation will work on most services anyway.
+	**/
+	public function make_long( $url ) {
+		return $this->url_get( $url, SLINKY_FINAL_URL );
+	}
+	
+	/**
+	 * Method for getting properties that you might need during the process
+	 * of shortening/lengthening a URL (e.g. auth credentials)
+	**/
+	public function get( $prop ) {
+		if ( empty( $this->$prop ) )
+			return null;
+			
+		return $this->$prop;
+	}
+	
+	/**
+	 * Method for setting properties that you might need during the process
+	 * of shortening/lengthening a URL (e.g. auth credentials)
+	**/
+	public function set( $prop, $val ) {
+		$this->$prop = $val;
+	}
+	
+	/**
+	 * Internal helper for performing a GET request on a remote URL.
+	 * 
+	 * @param string $url The URL to GET
+	 * @param const $return The return method [ SLINKY_BODY | SLINKY_FINAL_URL | SLINKY_HEADERS ]
+	 * @return Mixed, based on the $return var passed in.
+	**/
+	protected function url_get( $url, $return = SLINKY_BODY ) {
+		$ch = curl_init( $url );
+		curl_setopt( $ch, CURLOPT_USERAGENT, SLINKY_USER_AGENT );
+		curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0 );			// Don't stress about SSL validity
+		curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );			// Return the response, don't output it
+		curl_setopt( $ch, CURLOPT_TIMEOUT, SLINKY_TIMEOUT );	// Limit how long we'll wait for a response
+		curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );			// Allow following of redirections
+		$r  = curl_exec( $ch );
+		if ( curl_errno( $ch ) ) {
+			return false;
+		}
+		
+		// Return whatever we were asked for
+		if ( SLINKY_FINAL_URL == $return )
+			return curl_getinfo( $ch, CURLINFO_EFFECTIVE_URL );
+		else if ( SLINKY_BODY == $return )
+			return $r;
+		
+		return false;
+	}
+	
+	/**
+	 * Internal helper for performing a POST request on a remote URL.
+	 * 
+	 * @param string $url The URL to POST to
+	 * @param array $payload Array containing name/value pairs of the parameters to POST
+	 * @param const $return The return method [ SLINKY_BODY | SLINKY_FINAL_URL | SLINKY_HEADERS ]
+	 * @return Mixed, based on the $return var passed in.
+	**/
+	protected function url_post( $url, $payload = array(), $return = SLINKY_BODY ) {
+		$ch = curl_init( $url );
+		curl_setopt( $ch, CURLOPT_POST, true );
+		curl_setopt( $ch, CURLOPT_POSTFIELDS, (array) $payload );
+		curl_setopt( $ch, CURLOPT_USERAGENT, SLINKY_USER_AGENT );
+		curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0 );			// Don't stress about SSL validity
+		curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );			// Return the response, don't output it
+		curl_setopt( $ch, CURLOPT_TIMEOUT, SLINKY_TIMEOUT );	// Limit how long we'll wait for a response
+		curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );			// Allow following of redirections
+		$r  = curl_exec( $ch );
+		if ( curl_errno( $ch ) ) {
+			return false;
+		}
+		
+		// Return whatever we were asked for
+		if ( SLINKY_FINAL_URL == $return )
+			return curl_getinfo( $ch, CURLINFO_EFFECTIVE_URL );
+		else if ( SLINKY_BODY == $return )
+			return $r;
+		
+		return false;
+	}
+}
+
+// This default service is used in cases when you try to do something based
+// on auto-detection, but we can't detect anything. It will also resolve URLs
+// to their "long" version by following all redirects.
+class Slinky_Default extends Slinky_Service {
+	function url_is_short( $url ) {
+		return false;
+	}
+	
+	function url_is_long( $url ) {
+		return false;
+	}
+	
+	function make_short( $url ) {
+		return $url;
+	}
+}
+
+// Implementation of TinyURL as a Slinky Service
+class Slinky_TinyURL extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'tinyurl.com/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'tinyurl.com/' );
+	}
+	
+	function make_short( $url ) {
+		return $this->url_get( 'http://tinyurl.com/api-create.php?url=' . urlencode( $url ) );
+	}
+	
+	function make_long( $url ) {
+		$bits = parse_url( $url );
+		$result = $this->url_get( 'http://tinyurl.com/preview.php?num=' . substr( $bits['path'], 1 ) );
+		if ( preg_match('/<a id="redirecturl" href="([^"]+)">/is', $result, $matches ) )
+			return $matches[1];
+		else
+			return $url;
+	}
+}
+
+// Implementation of Bit.ly as a Slinky Service
+/*
+To use Bit.ly, you MUST set your login and apiKey for the service first, e.g.
+
+$bitly = new Slinky_Bitly();
+$bitly->set( 'login', 'bitly_login' );
+$bitly->set( 'apiKey', 'bitly_apiKey' );
+
+$slinky = new Slinky( $url, $bitly );
+echo $slinky->short();
+
+You could also do this if the URL was already a bit.ly URL and you 
+were going to make it longer, since Bitly is supported for auto-detection:
+
+$slinky = new Slinky( $url );
+$slinky->set_service_from_url();
+$slinky->service->set( 'login', 'bitly_login' );
+$slinky->service->set( 'apiKey', 'bitly_apiKey' );
+echo $slinky->long();
+
+*/
+class Slinky_Bitly extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'bit.ly/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'bit.ly/' );
+	}
+	
+	function make_short( $url ) {
+		// Can't do anything unless these 2 properties are set first
+		if ( !$this->get( 'login' ) || !$this->get( 'apiKey' ) )
+			return $url;
+		
+		$result = $this->url_post( 'http://api.bit.ly/shorten?version=2.0.1&format=json&login=' . $this->get( 'login' ) . '&apiKey=' . $this->get( 'apiKey' ) . '&longUrl=' . urlencode( $url ) );
+		$result = json_decode( $result );
+		if ( !$result->errorCode ) {
+			foreach ( $result->results as $detail ) {
+				return $detail->shortUrl;
+			}
+		} else {
+			return false;
+		}
+	}
+	
+	function make_long( $url ) {
+		// Can't do anything unless these 2 properties are set first
+		if ( !$this->get( 'login' ) || !$this->get( 'apiKey' ) )
+			return $url;
+		
+		$result = $this->url_post( 'http://api.bit.ly/expand?version=2.0.1&format=json&login=' . $this->get( 'login' ) . '&apiKey=' . $this->get( 'apiKey' ) . '&shortUrl=' . urlencode( $url ) );
+		$result = json_decode( $result );
+		if ( !$result->errorCode ) {
+			foreach ( $result->results as $detail ) {
+				return $detail->longUrl;
+			}
+		} else {
+			return false;
+		}
+	}
+}
+
+// Implementation of Tr.im as a Slinky Service
+/*
+When using Tr.im, you MAY optionally set your username and password to tie 
+URLs to your account, e.g.
+
+$trim = new Slinky_Trim();
+$trim->set( 'username', 'trim_username' );
+$trim->set( 'password', 'trim_password' );
+
+$slinky = new Slinky( $url, $trim );
+echo $slinky->short();
+
+You could also do this if the URL was already a tr.im URL and you 
+were going to make it longer, since Tr.im is supported for auto-detection:
+
+$slinky = new Slinky( $url );
+$slinky->set_service_from_url();
+echo $slinky->long();
+
+*/
+class Slinky_Trim extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'tr.im/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'tr.im/' );
+	}
+	
+	function make_short( $url ) {
+		$url = 'http://api.tr.im/api/trim_simple?url=' . urlencode( $url );
+
+		if ( $this->get( 'username' ) && $this->get( 'password' ) )
+			$url .= '&username=' . urlencode( $this->get( 'username' ) ) . '&password=' . urlencode( $this->get( 'password' ) );
+		
+		return $this->url_get( $url );
+	}
+	
+	function make_long( $url ) {
+		$bits = parse_url( $url );
+		$result = $this->url_get( 'http://api.tr.im/api/trim_destination.json?trimpath=' . substr( $bits['path'], 1 ) );
+		$result = json_decode($result);
+		if ( 'OK' == $result->status->result )
+			return $result->destination;
+		else
+			return $url;
+	}
+}
+
+// Implementation of Is.Gd as a Slinky Service
+class Slinky_IsGd extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'is.gd/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'is.gd/' );
+	}
+	
+	function make_short( $url ) {
+		$response = $this->url_get( 'http://is.gd/api.php?longurl=' . urlencode( $url ) );
+		if ( 'error' == substr( strtolower( $response ), 0, 5 ) )
+			return false;
+		else
+			return $response;
+	}
+}
+
+// Fon.gs
+class Slinky_Fongs extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'fon.gs/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'fon.gs/' );
+	}
+	
+	function make_short( $url ) {
+		$response = $this->url_get( 'http://fon.gs/create.php?url=' . urlencode( $url ) );
+		if ( 'OK:' == substr( $response, 0, 3 ) )
+			return str_replace( 'OK: ', '', $response );
+		else
+			return $url;
+	}
+}
+
+// Micu.rl
+class Slinky_Micurl extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'micurl.com/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'micurl.com/' );
+	}
+	
+	function make_short( $url ) {
+		$result = $this->url_get( 'http://micurl.com/api.php?url=' . urlencode( $url ) );
+		if ( 1 != $result && 2 != $result )
+			return 'http://micurl.com/' . $result;
+		else
+			return $url;
+	}
+}
+
+// ur1.ca
+class Slinky_Ur1ca extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'ur1.ca/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'ur1.ca/' );
+	}
+	
+	function make_short( $url ) {
+		$result = $this->url_post( 'http://ur1.ca/', array( 'longurl' => $url ) );
+		if ( preg_match( '/<p class="success">Your ur1 is: <a href="([^"]+)">/', $result, $matches ) )
+			return $matches[1];
+		else
+			return $url;
+	}
+}
+
+// PtitURL.com
+class Slinky_PtitURL extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'ptiturl.com/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'ptiturl.com/' );
+	}
+	
+	function make_short( $url ) {
+		$result = $this->url_get( 'http://ptiturl.com/index.php?creer=oui&url=' . urlencode( $url ) );
+		if ( preg_match( '/<pre><a href=\'?([^\'>]+)\'?>/', $result, $matches ) )
+			return $matches[1];
+		else
+			return $url;
+	}
+}
+
+// Tighturl.com
+class Slinky_TightURL extends Slinky_Service {
+	function url_is_short( $url ) {
+		return stristr( $url, 'tighturl.com/' )
+				|| stristr( $url, '2tu.us/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'tighturl.com/' )
+				&& !stristr( $url, '2tu.us/' );
+	}
+	
+	function make_short( $url ) {
+		$response = $this->url_get( 'http://tighturl.com/?save=y&url=' . urlencode( $url ) );
+		if ( preg_match( '/Your tight URL is: <code><a href=\'([^\']+)\' target=\'_blank\'>/', $response, $matches ) ) {
+			return $matches[1];
+		} else {
+			return $url;
+		}
+	}
+}
+
+// Snipr for Slinky
+/*
+To use Snipr, you MUST set your user_id and API (key) for the service first, e.g.
+
+$snipr = new Slinky_Snipr();
+$snipr->set( 'user_id', 'Snipr User ID' );
+$snipr->set( 'API', 'Snipr API Key' );
+
+$slinky = new Slinky( $url, $snipr );
+echo $slinky->short();
+
+NOTE: Snipr requires the SimpleXML extension to be installed for lengthening URLs
+*/
+class Slinky_Snipr extends Slinky_Service {
+	// Snipurl, Snurl, Snipr, Sn.im
+	function url_is_short( $url ) {
+		return stristr( $url, 'snipr.com/' ) || stristr( $url, 'snipurl.com/' ) || stristr( $url, 'snurl.com/' ) || stristr( $url, 'sn.im/' );
+	}
+	
+	function url_is_long( $url ) {
+		return !stristr( $url, 'snipr.com/' ) || !stristr( $url, 'snipurl.com/' ) || !stristr( $url, 'snurl.com/' ) || !stristr( $url, 'sn.im/' );
+	}
+	
+	function make_short( $url ) {
+		if ( !$this->get( 'user_id' ) || !$this->get( 'API' ) )
+			return $url;
+		
+		$response = $this->url_post( 'http://snipr.com/site/getsnip', array( 'sniplink' => urlencode( $url ), 'snipuser' => $this->get( 'user_id'), 'snipapi' => $this->get( 'API' ), 'snipformat' => 'simple' ) );
+		if ( 'ERROR' != substr( $response, 0, 5 ) )
+			return $response;
+		else
+			return $url;
+	}
+}
+
+// If you're testing things out, http://dentedreality.com.au/ should convert to:
+// - http://tinyurl.com/jw5sh
+// - http://bit.ly/hEkAD
+// - http://tr.im/sk1H
+// - http://is.gd/1yJ81
+// - http://fon.gs/tc1p8c
+// - http://micurl.com/qen3uub
+// - http://ur1.ca/7dcd
+// - http://ptiturl.com/?id=bac8fb
+// - http://tighturl.com/kgd
+// - http://snipr.com/nbbw3
+// 
+// $slinky = new Slinky( 'http://dentedreality.com.au/' );
+// echo $slinky->short();

addon/statusnet/statusnet.css

@@ -0,0 +1,67 @@
+
+
+#statusnet-avatar {
+	float: left;
+	width: 48px;
+	height: 48px;
+	padding: 2px;
+}
+#statusnet-info-block {
+	height: 52px;
+	vertical-align: middle;
+}
+#statusnet-disconnect-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 25px;
+}
+
+#statusnet-disconnect {
+	float: left;
+}
+#statusnet-enable-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 5px;
+}
+
+#statusnet-checkbox {
+	float: left;
+}
+#statusnet-pin-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 25px;
+}
+#statusnet-pin {
+	float: left;
+}
+
+
+#statusnet-consumerkey-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 8px;
+}
+#statusnet-consumerkey {
+	float: left;
+	margin-bottom: 8px;
+}
+#statusnet-consumersecret-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 8px;
+}
+#statusnet-consumersecret {
+	float: left;
+	margin-bottom: 8px;
+}
+#statusnet-baseapi-label {
+	float: left;
+	width: 200px;
+	margin-bottom: 25px;
+}
+#statusnet-baseapi {
+	float: left;
+	margin-bottom: 8px;
+}

addon/statusnet/statusnet.php

@@ -0,0 +1,243 @@
+<?php
+
+/*   StatusNet Plugin for Friendika
+ *
+ *   Author: Tobias Diekershoff
+ *           tobias.diekershoff@gmx.net
+ *
+ *   License:3-clause BSD license (same as Friendika)
+ *
+ *   Configuration:
+ *     To activate the plugin itself add it to the $a->config['system']['addon']
+ *     setting. After this, your user can configure their Twitter account settings
+ *     from "Settings -> Plugin Settings".
+ *
+ *     Requirements: PHP5, curl [Slinky library]
+ *
+ *     Documentation: http://diekershoff.homeunix.net/redmine/wiki/friendikaplugin/StatusNet_Plugin
+ */
+
+/*   __TODO__
+ *
+ *   - what about multimedia content?
+ *     so far we just strip HTML tags from the message
+ */
+
+
+/***
+ * We have to alter the TwitterOAuth class a little bit to work with any StatusNet
+ * installation abroad. Basically it's only make the API path variable and be happy.
+ *
+ * Thank you guys for the Twitter compatible API!
+ */
+require_once('addon/twitter/twitteroauth.php');
+class StatusNetOAuth extends TwitterOAuth {
+    function get_maxlength() {
+        $config = $this->get($this->host . 'statusnet/config.json');
+        return $config->site->textlimit;
+    }
+    function accessTokenURL()  { return $this->host.'oauth/access_token'; }
+    function authenticateURL() { return $this->host.'oauth/authenticate'; } 
+    function authorizeURL() { return $this->host.'oauth/authorize'; }
+    function requestTokenURL() { return $this->host.'oauth/request_token'; }
+    function __construct($apipath, $consumer_key, $consumer_secret, $oauth_token = NULL, $oauth_token_secret = NULL) {
+        parent::__construct($consumer_key, $consumer_secret, $oauth_token, $oauth_token_secret);
+        $this->host = $apipath;
+    }
+}
+
+function statusnet_install() {
+	//  we need some hooks, for the configuration and for sending tweets
+	register_hook('plugin_settings', 'addon/statusnet/statusnet.php', 'statusnet_settings'); 
+	register_hook('plugin_settings_post', 'addon/statusnet/statusnet.php', 'statusnet_settings_post');
+	register_hook('post_local_end', 'addon/statusnet/statusnet.php', 'statusnet_post_hook');
+	logger("installed statusnet");
+}
+
+
+function statusnet_uninstall() {
+	unregister_hook('plugin_settings', 'addon/statusnet/statusnet.php', 'statusnet_settings'); 
+	unregister_hook('plugin_settings_post', 'addon/statusnet/statusnet.php', 'statusnet_settings_post');
+	unregister_hook('post_local_end', 'addon/statusnet/statusnet.php', 'statusnet_post_hook');
+}
+
+function statusnet_settings_post ($a,$post) {
+	if(! local_user())
+	    return;
+	if (isset($_POST['statusnet-disconnect'])) {
+	    /***
+	     * if the statusnet-disconnect checkbox is set, clear the statusnet configuration
+	     * TODO can we revoke the access tokens at Twitter and do we need to do so?
+	     */
+            del_pconfig( local_user(), 'statusnet', 'consumerkey'  );
+	    del_pconfig( local_user(), 'statusnet', 'consumersecret' );
+	    del_pconfig( local_user(), 'statusnet', 'post' );
+            del_pconfig( local_user(), 'statusnet', 'oauthtoken' );
+            del_pconfig( local_user(), 'statusnet', 'oauthsecret' );
+            del_pconfig( local_user(), 'statusnet', 'baseapi' );
+	} else {
+        if (isset($_POST['statusnet-consumersecret'])) {
+            set_pconfig(local_user(), 'statusnet', 'consumerkey', $_POST['statusnet-consumerkey']);
+            set_pconfig(local_user(), 'statusnet', 'consumersecret', $_POST['statusnet-consumersecret']);
+            set_pconfig(local_user(), 'statusnet', 'baseapi', $_POST['statusnet-baseapi']);
+            header('Location: '.$a->get_baseurl().'/settings/addon');
+        } else {
+	if (isset($_POST['statusnet-pin'])) {
+	    //  if the user supplied us with a PIN from Twitter, let the magic of OAuth happen
+	    logger('got a StatusNet security code');
+            $api     = get_pconfig(local_user(), 'statusnet', 'baseapi');
+	    $ckey    = get_pconfig(local_user(), 'statusnet', 'consumerkey'  );
+	    $csecret = get_pconfig(local_user(), 'statusnet', 'consumersecret' );
+	    //  the token and secret for which the PIN was generated were hidden in the settings
+	    //  form as token and token2, we need a new connection to Twitter using these token
+	    //  and secret to request a Access Token with the PIN
+	    $connection = new StatusNetOAuth($api, $ckey, $csecret, $_POST['statusnet-token'], $_POST['statusnet-token2']);
+	    $token   = $connection->getAccessToken( $_POST['statusnet-pin'] );
+	    //  ok, now that we have the Access Token, save them in the user config
+ 	    set_pconfig(local_user(),'statusnet', 'oauthtoken',  $token['oauth_token']);
+	    set_pconfig(local_user(),'statusnet', 'oauthsecret', $token['oauth_token_secret']);
+            set_pconfig(local_user(),'statusnet', 'post', 1);
+            //  reload the Addon Settings page, if we don't do it see Bug #42
+            header('Location: '.$a->get_baseurl().'/settings/addon');
+	} else {
+	    //  if no PIN is supplied in the POST variables, the user has changed the setting
+	    //  to post a tweet for every new __public__ posting to the wall
+	    set_pconfig(local_user(),'statusnet','post',intval($_POST['statusnet-enable']));
+	}}}
+}
+function statusnet_settings(&$a,&$s) {
+        if(! local_user())
+                return;
+        $a->page['htmlhead'] .= '<link rel="stylesheet"  type="text/css" href="' . $a->get_baseurl() . '/addon/statusnet/statusnet.css' . '" media="all" />' . "\r\n";
+	/***
+	 * 1) Check that we have a base api url and a consumer key & secret
+	 * 2) If no OAuthtoken & stuff is present, generate button to get some
+	 * 3) Checkbox for "Send public notices (respect size limitation)
+	 */
+        $api     = get_pconfig(local_user(), 'statusnet', 'baseapi');
+	$ckey    = get_pconfig(local_user(), 'statusnet', 'consumerkey' );
+	$csecret = get_pconfig(local_user(), 'statusnet', 'consumersecret' );
+	$otoken  = get_pconfig(local_user(), 'statusnet', 'oauthtoken'  );
+	$osecret = get_pconfig(local_user(), 'statusnet', 'oauthsecret' );
+        $enabled = get_pconfig(local_user(), 'statusnet', 'post');
+	$checked = (($enabled) ? ' checked="checked" ' : '');
+	$s .= '<h3>'.t('StatusNet Posting Settings').'</h3>';
+
+	if ( (!$ckey) && (!$csecret) ) {
+		/***
+		 * no consumer keys
+		 */
+		$s .= '<p>'.t('No consumer key pair for StatusNet found. Register your Friendika Account as an desktop client on your StatusNet account, copy the consumer key pair here and enter the API base root.<br />Before you register your own OAuth key pair ask the administrator if there is already a key pair for this Friendika installation at your favorited StatusNet installation.').'</p>';
+                $s .= '<div id="statusnet-consumer-wrapper">';
+                $s .= '<label id="statusnet-consumerkey-label" for="statusnet-consumerkey">OAuth Consumer Key</label>';
+		$s .= '<input id="statusnet-consumerkey" type="text" name="statusnet-consumerkey" size="35" /><br />';
+                $s .= '<label id="statusnet-consumersecret-label" for="statusnet-consumersecret">OAuth Consumer Secret</label>';
+		$s .= '<input id="statusnet-consumersecret" type="text" name="statusnet-consumersecret" size="35" /><br />';
+                $s .= '<label id="statusnet-baseapi-label" for="statusnet-baseapi">Base API Path (remember the trailing /)</label>';
+		$s .= '<input id="statusnet-baseapi" type="text" name="statusnet-baseapi" size="35" /><br  />';
+                $s .= '</div><div class="clear"></div>';
+                $s .= '<div class="settings-submit-wrapper" ><input type="submit" name="submit" class="settings-submit" value="' . t('Submit') . '" /></div>';
+	} else {
+		/***
+		 * ok we have a consumer key pair now look into the OAuth stuff
+		 */
+		if ( (!$otoken) && (!$osecret) ) {
+			/***
+			 * the user has not yet connected the account to statusnet
+			 * get a temporary OAuth key/secret pair and display a button with
+			 * which the user can request a PIN to connect the account to a
+			 * account at statusnet
+			 */
+			$connection = new StatusNetOAuth($api, $ckey, $csecret);
+			$request_token = $connection->getRequestToken('oob');
+			$token = $request_token['oauth_token'];
+			/***
+			 *  make some nice form
+			 */
+			$s .= '<p>'.t('To connect to your StatusNet account click the button below to get a security code from StatusNet which you have to copy into the input box below and submit the form. Only your <strong>public</strong> posts will be posted to StatusNet.').'</p>';
+			$s .= '<a href="'.$connection->getAuthorizeURL($token,False).'" target="_statusnet"><img src="addon/statusnet/signinwithstatusnet.png" alt="'.t('Log in with StatusNet').'"></a>';
+			$s .= '<div id="statusnet-pin-wrapper">';
+			$s .= '<label id="statusnet-pin-label" for="statusnet-pin">'.t('Copy the PIN from StatusNet here').'</label>';
+			$s .= '<input id="statusnet-pin" type="text" name="statusnet-pin" />';
+			$s .= '<input id="statusnet-token" type="hidden" name="statusnet-token" value="'.$token.'" />';
+			$s .= '<input id="statusnet-token2" type="hidden" name="statusnet-token2" value="'.$request_token['oauth_token_secret'].'" />';
+                        $s .= '</div><div class="clear"></div>';
+                        $s .= '<div class="settings-submit-wrapper" ><input type="submit" name="submit" class="settings-submit" value="' . t('Submit') . '" /></div>';
+		} else {
+			/***
+			 *  we have an OAuth key / secret pair for the user
+			 *  so let's give a chance to disable the postings to statusnet
+			 */
+			$connection = new StatusNetOAuth($api,$ckey,$csecret,$otoken,$osecret);
+			$details = $connection->get('account/verify_credentials');
+			$s .= '<div id="statusnet-info" ><img id="statusnet-avatar" src="'.$details->profile_image_url.'" /><p id="statusnet-info-block">'.t('Currently connected to: ').'<a href="'.$details->statusnet_profile_url.'" target="_statusnet">'.$details->screen_name.'</a><br /><em>'.$details->description.'</em></p></div>';
+			$s .= '<p>'.t('If enabled all your <strong>public</strong> postings will be posted to the associated StatusNet account as well.').'</p>';
+			$s .= '<div id="statusnet-enable-wrapper">';
+			$s .= '<label id="statusnet-enable-label" for="statusnet-checkbox">'.t('Send public postings to StatusNet').'</label>';
+			$s .= '<input id="statusnet-checkbox" type="checkbox" name="statusnet-enable" value="1" ' . $checked . '/>';
+			$s .= '</div><div class="clear"></div>';
+			$s .= '<div id="statusnet-disconnect-wrapper">';
+                        $s .= '<label id="statusnet-disconnect-label" for="statusnet-disconnect">'.t('Clear OAuth configuration').'</label>';
+                        $s .= '<input id="statusnet-disconnect" type="checkbox" name="statusnet-disconnect" value="1" />';
+			$s .= '</div><div class="clear"></div>';
+			$s .= '<div class="settings-submit-wrapper" ><input type="submit" name="submit" class="settings-submit" value="' . t('Submit') . '" /></div>'; 
+		}
+	}
+        $s .= '</div><div class="clear"></div>';
+}
+
+
+function statusnet_post_hook(&$a,&$b) {
+
+	/**
+	 * Post to statusnet
+	 */
+
+        logger('StatusNet post invoked');
+
+	if((local_user()) && (local_user() == $b['uid']) && (! $b['private'])) {
+
+                load_pconfig(local_user(), 'statusnet');
+            
+                $api     = get_pconfig(local_user(), 'statusnet', 'baseapi');
+                $ckey    = get_pconfig(local_user(), 'statusnet', 'consumerkey'  );
+		$csecret = get_pconfig(local_user(), 'statusnet', 'consumersecret' );
+		$otoken  = get_pconfig(local_user(), 'statusnet', 'oauthtoken'  );
+		$osecret = get_pconfig(local_user(), 'statusnet', 'oauthsecret' );
+
+		if($ckey && $csecret && $otoken && $osecret) {
+
+			$statusnet_post = get_pconfig(local_user(),'statusnet','post');
+
+			if($statusnet_post) {
+				require_once('include/bbcode.php');	
+				$dent = new StatusNetOAuth($api,$ckey,$csecret,$otoken,$osecret);
+				$max_char = $dent->get_maxlength(); // max. length for a dent
+				$msg = strip_tags(bbcode($b['body']));
+                                if ( strlen($msg) > $max_char) {
+                                        $shortlink = "";
+                                        require_once('addon/statusnet/slinky.php');
+                                        // post url = base url + /display/ + owner + post id
+                                        // we construct this from the Owner link and replace
+                                        // profile by display - this will cause an error when
+                                        // /profile/ is in the owner url twice but I don't
+                                        // think this will be very common...
+					$posturl = str_replace('/profile/','/display/',$b['owner-link']).'/'.$b['id'];
+					$slinky = new Slinky( $posturl );
+					// setup a cascade of shortening services
+					// try to get a short link from these services
+					// in the order ur1.ca, trim, id.gd, tinyurl
+					$slinky->set_cascade( array( new Slinky_UR1ca(), new Slinky_Trim(), new Slinky_IsGd(), new Slinky_TinyURL() ) );
+                                        $shortlink = $slinky->short();
+                                        // the new message will be shortened such that "... $shortlink"
+                                        // will fit into the character limit
+                                        $msg = substr($msg, 0, $max_char-strlen($shortlink)-4);
+                                        $msg .= '... ' . $shortlink;
+                                }
+                                // and now tweet it :-)
+				$dent->post('statuses/update', array('status' => $msg));
+			}
+		}
+        }
+}
+

addon/statusnet/twitteroauth.php

@@ -0,0 +1,245 @@
+<?php
+
+/*
+ * Abraham Williams (abraham@abrah.am) http://abrah.am
+ *
+ * The first PHP Library to support OAuth for Twitter's REST API.
+ */
+
+/* Load OAuth lib. You can find it at http://oauth.net */
+require_once('addon/twitter/OAuth.php');
+
+/**
+ * Twitter OAuth class
+ */
+class TwitterOAuth {
+  /* Contains the last HTTP status code returned. */
+  public $http_code;
+  /* Contains the last API call. */
+  public $url;
+  /* Set up the API root URL. */
+  public $host = "https://api.twitter.com/1/";
+  /* Set timeout default. */
+  public $timeout = 30;
+  /* Set connect timeout. */
+  public $connecttimeout = 30; 
+  /* Verify SSL Cert. */
+  public $ssl_verifypeer = FALSE;
+  /* Respons format. */
+  public $format = 'json';
+  /* Decode returned json data. */
+  public $decode_json = TRUE;
+  /* Contains the last HTTP headers returned. */
+  public $http_info;
+  /* Set the useragnet. */
+  public $useragent = 'TwitterOAuth v0.2.0-beta2';
+  /* Immediately retry the API call if the response was not successful. */
+  //public $retry = TRUE;
+
+
+
+
+  /**
+   * Set API URLS
+   */
+  function accessTokenURL()  { return 'https://api.twitter.com/oauth/access_token'; }
+  function authenticateURL() { return 'https://twitter.com/oauth/authenticate'; }
+  function authorizeURL()    { return 'https://twitter.com/oauth/authorize'; }
+  function requestTokenURL() { return 'https://api.twitter.com/oauth/request_token'; }
+
+  /**
+   * Debug helpers
+   */
+  function lastStatusCode() { return $this->http_status; }
+  function lastAPICall() { return $this->last_api_call; }
+
+  /**
+   * construct TwitterOAuth object
+   */
+  function __construct($consumer_key, $consumer_secret, $oauth_token = NULL, $oauth_token_secret = NULL) {
+    $this->sha1_method = new OAuthSignatureMethod_HMAC_SHA1();
+    $this->consumer = new OAuthConsumer($consumer_key, $consumer_secret);
+    if (!empty($oauth_token) && !empty($oauth_token_secret)) {
+      $this->token = new OAuthConsumer($oauth_token, $oauth_token_secret);
+    } else {
+      $this->token = NULL;
+    }
+  }
+
+
+  /**
+   * Get a request_token from Twitter
+   *
+   * @returns a key/value array containing oauth_token and oauth_token_secret
+   */
+  function getRequestToken($oauth_callback = NULL) {
+    $parameters = array();
+    if (!empty($oauth_callback)) {
+      $parameters['oauth_callback'] = $oauth_callback;
+    } 
+    $request = $this->oAuthRequest($this->requestTokenURL(), 'GET', $parameters);
+    $token = OAuthUtil::parse_parameters($request);
+    $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
+    return $token;
+  }
+
+  /**
+   * Get the authorize URL
+   *
+   * @returns a string
+   */
+  function getAuthorizeURL($token, $sign_in_with_twitter = TRUE) {
+    if (is_array($token)) {
+      $token = $token['oauth_token'];
+    }
+    if (empty($sign_in_with_twitter)) {
+      return $this->authorizeURL() . "?oauth_token={$token}";
+    } else {
+       return $this->authenticateURL() . "?oauth_token={$token}";
+    }
+  }
+
+  /**
+   * Exchange request token and secret for an access token and
+   * secret, to sign API calls.
+   *
+   * @returns array("oauth_token" => "the-access-token",
+   *                "oauth_token_secret" => "the-access-secret",
+   *                "user_id" => "9436992",
+   *                "screen_name" => "abraham")
+   */
+  function getAccessToken($oauth_verifier = FALSE) {
+    $parameters = array();
+    if (!empty($oauth_verifier)) {
+      $parameters['oauth_verifier'] = $oauth_verifier;
+    }
+    $request = $this->oAuthRequest($this->accessTokenURL(), 'GET', $parameters);
+    $token = OAuthUtil::parse_parameters($request);
+    $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
+    return $token;
+  }
+
+  /**
+   * One time exchange of username and password for access token and secret.
+   *
+   * @returns array("oauth_token" => "the-access-token",
+   *                "oauth_token_secret" => "the-access-secret",
+   *                "user_id" => "9436992",
+   *                "screen_name" => "abraham",
+   *                "x_auth_expires" => "0")
+   */  
+  function getXAuthToken($username, $password) {
+    $parameters = array();
+    $parameters['x_auth_username'] = $username;
+    $parameters['x_auth_password'] = $password;
+    $parameters['x_auth_mode'] = 'client_auth';
+    $request = $this->oAuthRequest($this->accessTokenURL(), 'POST', $parameters);
+    $token = OAuthUtil::parse_parameters($request);
+    $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
+    return $token;
+  }
+
+  /**
+   * GET wrapper for oAuthRequest.
+   */
+  function get($url, $parameters = array()) {
+    $response = $this->oAuthRequest($url, 'GET', $parameters);
+    if ($this->format === 'json' && $this->decode_json) {
+      return json_decode($response);
+    }
+    return $response;
+  }
+  
+  /**
+   * POST wrapper for oAuthRequest.
+   */
+  function post($url, $parameters = array()) {
+    $response = $this->oAuthRequest($url, 'POST', $parameters);
+    if ($this->format === 'json' && $this->decode_json) {
+      return json_decode($response);
+    }
+    return $response;
+  }
+
+  /**
+   * DELETE wrapper for oAuthReqeust.
+   */
+  function delete($url, $parameters = array()) {
+    $response = $this->oAuthRequest($url, 'DELETE', $parameters);
+    if ($this->format === 'json' && $this->decode_json) {
+      return json_decode($response);
+    }
+    return $response;
+  }
+
+  /**
+   * Format and sign an OAuth / API request
+   */
+  function oAuthRequest($url, $method, $parameters) {
+    if (strrpos($url, 'https://') !== 0 && strrpos($url, 'http://') !== 0) {
+      $url = "{$this->host}{$url}.{$this->format}";
+    }
+    $request = OAuthRequest::from_consumer_and_token($this->consumer, $this->token, $method, $url, $parameters);
+    $request->sign_request($this->sha1_method, $this->consumer, $this->token);
+    switch ($method) {
+    case 'GET':
+      return $this->http($request->to_url(), 'GET');
+    default:
+      return $this->http($request->get_normalized_http_url(), $method, $request->to_postdata());
+    }
+  }
+
+  /**
+   * Make an HTTP request
+   *
+   * @return API results
+   */
+  function http($url, $method, $postfields = NULL) {
+    $this->http_info = array();
+    $ci = curl_init();
+    /* Curl settings */
+    curl_setopt($ci, CURLOPT_USERAGENT, $this->useragent);
+    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, $this->connecttimeout);
+    curl_setopt($ci, CURLOPT_TIMEOUT, $this->timeout);
+    curl_setopt($ci, CURLOPT_RETURNTRANSFER, TRUE);
+    curl_setopt($ci, CURLOPT_HTTPHEADER, array('Expect:'));
+    curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, $this->ssl_verifypeer);
+    curl_setopt($ci, CURLOPT_HEADERFUNCTION, array($this, 'getHeader'));
+    curl_setopt($ci, CURLOPT_HEADER, FALSE);
+
+    switch ($method) {
+      case 'POST':
+        curl_setopt($ci, CURLOPT_POST, TRUE);
+        if (!empty($postfields)) {
+          curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
+        }
+        break;
+      case 'DELETE':
+        curl_setopt($ci, CURLOPT_CUSTOMREQUEST, 'DELETE');
+        if (!empty($postfields)) {
+          $url = "{$url}?{$postfields}";
+        }
+    }
+
+    curl_setopt($ci, CURLOPT_URL, $url);
+    $response = curl_exec($ci);
+    $this->http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);
+    $this->http_info = array_merge($this->http_info, curl_getinfo($ci));
+    $this->url = $url;
+    curl_close ($ci);
+    return $response;
+  }
+
+  /**
+   * Get the header info to store.
+   */
+  function getHeader($ch, $header) {
+    $i = strpos($header, ':');
+    if (!empty($i)) {
+      $key = str_replace('-', '_', strtolower(substr($header, 0, $i)));
+      $value = trim(substr($header, $i + 2));
+      $this->http_header[$key] = $value;
+    }
+    return strlen($header);
+  }
+}