flickr integration

2 files changed, 1590 insertions, 0 deletions

diff --git a/lib/phpFlickr/PEAR/HTTP/Request.php b/lib/phpFlickr/PEAR/HTTP/Request.php
new file mode 100644
index 000000000..55e227b3a
--- /dev/null
+++ b/lib/phpFlickr/PEAR/HTTP/Request.php
@@ -0,0 +1,1484 @@
+<?php
+/**
+ * Class for performing HTTP requests
+ *
+ * PHP versions 4 and 5
+ * 
+ * LICENSE:
+ *
+ * Copyright (c) 2002-2007, Richard Heyes
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * o Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * o 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.
+ * o The names of the authors may not 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.
+ *
+ * @category    HTTP
+ * @package     HTTP_Request
+ * @author      Richard Heyes <richard@phpguru.org>
+ * @author      Alexey Borzov <avb@php.net>
+ * @copyright   2002-2007 Richard Heyes
+ * @license     http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version     CVS: $Id: Request.php 127 2008-01-17 20:21:37Z dcoulter $
+ * @link        http://pear.php.net/package/HTTP_Request/ 
+ */
+
+/**
+ * PEAR and PEAR_Error classes (for error handling)
+ */
+require_once 'PEAR.php';
+/**
+ * Socket class
+ */
+require_once 'Net/Socket.php';
+/**
+ * URL handling class
+ */ 
+require_once 'Net/URL.php';
+
+/**#@+
+ * Constants for HTTP request methods
+ */ 
+define('HTTP_REQUEST_METHOD_GET',     'GET',     true);
+define('HTTP_REQUEST_METHOD_HEAD',    'HEAD',    true);
+define('HTTP_REQUEST_METHOD_POST',    'POST',    true);
+define('HTTP_REQUEST_METHOD_PUT',     'PUT',     true);
+define('HTTP_REQUEST_METHOD_DELETE',  'DELETE',  true);
+define('HTTP_REQUEST_METHOD_OPTIONS', 'OPTIONS', true);
+define('HTTP_REQUEST_METHOD_TRACE',   'TRACE',   true);
+/**#@-*/
+
+/**#@+
+ * Constants for HTTP request error codes
+ */ 
+define('HTTP_REQUEST_ERROR_FILE',             1);
+define('HTTP_REQUEST_ERROR_URL',              2);
+define('HTTP_REQUEST_ERROR_PROXY',            4);
+define('HTTP_REQUEST_ERROR_REDIRECTS',        8);
+define('HTTP_REQUEST_ERROR_RESPONSE',        16);  
+define('HTTP_REQUEST_ERROR_GZIP_METHOD',     32);
+define('HTTP_REQUEST_ERROR_GZIP_READ',       64);
+define('HTTP_REQUEST_ERROR_GZIP_DATA',      128);
+define('HTTP_REQUEST_ERROR_GZIP_CRC',       256);
+/**#@-*/
+
+/**#@+
+ * Constants for HTTP protocol versions
+ */
+define('HTTP_REQUEST_HTTP_VER_1_0', '1.0', true);
+define('HTTP_REQUEST_HTTP_VER_1_1', '1.1', true);
+/**#@-*/
+
+if (extension_loaded('mbstring') && (2 & ini_get('mbstring.func_overload'))) {
+   /**
+    * Whether string functions are overloaded by their mbstring equivalents 
+    */
+    define('HTTP_REQUEST_MBSTRING', true);
+} else {
+   /**
+    * @ignore
+    */
+    define('HTTP_REQUEST_MBSTRING', false);
+}
+
+/**
+ * Class for performing HTTP requests
+ *
+ * Simple example (fetches yahoo.com and displays it):
+ * <code>
+ * $a = &new HTTP_Request('http://www.yahoo.com/');
+ * $a->sendRequest();
+ * echo $a->getResponseBody();
+ * </code>
+ *
+ * @category    HTTP
+ * @package     HTTP_Request
+ * @author      Richard Heyes <richard@phpguru.org>
+ * @author      Alexey Borzov <avb@php.net>
+ * @version     Release: 1.4.2
+ */
+class HTTP_Request
+{
+   /**#@+
+    * @access private
+    */
+    /**
+    * Instance of Net_URL
+    * @var Net_URL
+    */
+    var $_url;
+
+    /**
+    * Type of request
+    * @var string
+    */
+    var $_method;
+
+    /**
+    * HTTP Version
+    * @var string
+    */
+    var $_http;
+
+    /**
+    * Request headers
+    * @var array
+    */
+    var $_requestHeaders;
+
+    /**
+    * Basic Auth Username
+    * @var string
+    */
+    var $_user;
+    
+    /**
+    * Basic Auth Password
+    * @var string
+    */
+    var $_pass;
+
+    /**
+    * Socket object
+    * @var Net_Socket
+    */
+    var $_sock;
+    
+    /**
+    * Proxy server
+    * @var string
+    */
+    var $_proxy_host;
+    
+    /**
+    * Proxy port
+    * @var integer
+    */
+    var $_proxy_port;
+    
+    /**
+    * Proxy username
+    * @var string
+    */
+    var $_proxy_user;
+    
+    /**
+    * Proxy password
+    * @var string
+    */
+    var $_proxy_pass;
+
+    /**
+    * Post data
+    * @var array
+    */
+    var $_postData;
+
+   /**
+    * Request body  
+    * @var string
+    */
+    var $_body;
+
+   /**
+    * A list of methods that MUST NOT have a request body, per RFC 2616
+    * @var array
+    */
+    var $_bodyDisallowed = array('TRACE');
+
+   /**
+    * Files to post 
+    * @var array
+    */
+    var $_postFiles = array();
+
+    /**
+    * Connection timeout.
+    * @var float
+    */
+    var $_timeout;
+    
+    /**
+    * HTTP_Response object
+    * @var HTTP_Response
+    */
+    var $_response;
+    
+    /**
+    * Whether to allow redirects
+    * @var boolean
+    */
+    var $_allowRedirects;
+    
+    /**
+    * Maximum redirects allowed
+    * @var integer
+    */
+    var $_maxRedirects;
+    
+    /**
+    * Current number of redirects
+    * @var integer
+    */
+    var $_redirects;
+
+   /**
+    * Whether to append brackets [] to array variables
+    * @var bool
+    */
+    var $_useBrackets = true;
+
+   /**
+    * Attached listeners
+    * @var array
+    */
+    var $_listeners = array();
+
+   /**
+    * Whether to save response body in response object property  
+    * @var bool
+    */
+    var $_saveBody = true;
+
+   /**
+    * Timeout for reading from socket (array(seconds, microseconds))
+    * @var array
+    */
+    var $_readTimeout = null;
+
+   /**
+    * Options to pass to Net_Socket::connect. See stream_context_create
+    * @var array
+    */
+    var $_socketOptions = null;
+   /**#@-*/
+
+    /**
+    * Constructor
+    *
+    * Sets up the object
+    * @param    string  The url to fetch/access
+    * @param    array   Associative array of parameters which can have the following keys:
+    * <ul>
+    *   <li>method         - Method to use, GET, POST etc (string)</li>
+    *   <li>http           - HTTP Version to use, 1.0 or 1.1 (string)</li>
+    *   <li>user           - Basic Auth username (string)</li>
+    *   <li>pass           - Basic Auth password (string)</li>
+    *   <li>proxy_host     - Proxy server host (string)</li>
+    *   <li>proxy_port     - Proxy server port (integer)</li>
+    *   <li>proxy_user     - Proxy auth username (string)</li>
+    *   <li>proxy_pass     - Proxy auth password (string)</li>
+    *   <li>timeout        - Connection timeout in seconds (float)</li>
+    *   <li>allowRedirects - Whether to follow redirects or not (bool)</li>
+    *   <li>maxRedirects   - Max number of redirects to follow (integer)</li>
+    *   <li>useBrackets    - Whether to append [] to array variable names (bool)</li>
+    *   <li>saveBody       - Whether to save response body in response object property (bool)</li>
+    *   <li>readTimeout    - Timeout for reading / writing data over the socket (array (seconds, microseconds))</li>
+    *   <li>socketOptions  - Options to pass to Net_Socket object (array)</li>
+    * </ul>
+    * @access public
+    */
+    function HTTP_Request($url = '', $params = array())
+    {
+        $this->_method         =  HTTP_REQUEST_METHOD_GET;
+        $this->_http           =  HTTP_REQUEST_HTTP_VER_1_1;
+        $this->_requestHeaders = array();
+        $this->_postData       = array();
+        $this->_body           = null;
+
+        $this->_user = null;
+        $this->_pass = null;
+
+        $this->_proxy_host = null;
+        $this->_proxy_port = null;
+        $this->_proxy_user = null;
+        $this->_proxy_pass = null;
+
+        $this->_allowRedirects = false;
+        $this->_maxRedirects   = 3;
+        $this->_redirects      = 0;
+
+        $this->_timeout  = null;
+        $this->_response = null;
+
+        foreach ($params as $key => $value) {
+            $this->{'_' . $key} = $value;
+        }
+
+        if (!empty($url)) {
+            $this->setURL($url);
+        }
+
+        // Default useragent
+        $this->addHeader('User-Agent', 'PEAR HTTP_Request class ( http://pear.php.net/ )');
+
+        // We don't do keep-alives by default
+        $this->addHeader('Connection', 'close');
+
+        // Basic authentication
+        if (!empty($this->_user)) {
+            $this->addHeader('Authorization', 'Basic ' . base64_encode($this->_user . ':' . $this->_pass));
+        }
+
+        // Proxy authentication (see bug #5913)
+        if (!empty($this->_proxy_user)) {
+            $this->addHeader('Proxy-Authorization', 'Basic ' . base64_encode($this->_proxy_user . ':' . $this->_proxy_pass));
+        }
+
+        // Use gzip encoding if possible
+        if (HTTP_REQUEST_HTTP_VER_1_1 == $this->_http && extension_loaded('zlib')) {
+            $this->addHeader('Accept-Encoding', 'gzip');
+        }
+    }
+    
+    /**
+    * Generates a Host header for HTTP/1.1 requests
+    *
+    * @access private
+    * @return string
+    */
+    function _generateHostHeader()
+    {
+        if ($this->_url->port != 80 AND strcasecmp($this->_url->protocol, 'http') == 0) {
+            $host = $this->_url->host . ':' . $this->_url->port;
+
+        } elseif ($this->_url->port != 443 AND strcasecmp($this->_url->protocol, 'https') == 0) {
+            $host = $this->_url->host . ':' . $this->_url->port;
+
+        } elseif ($this->_url->port == 443 AND strcasecmp($this->_url->protocol, 'https') == 0 AND strpos($this->_url->url, ':443') !== false) {
+            $host = $this->_url->host . ':' . $this->_url->port;
+        
+        } else {
+            $host = $this->_url->host;
+        }
+
+        return $host;
+    }
+    
+    /**
+    * Resets the object to its initial state (DEPRECATED).
+    * Takes the same parameters as the constructor.
+    *
+    * @param  string $url    The url to be requested
+    * @param  array  $params Associative array of parameters
+    *                        (see constructor for details)
+    * @access public
+    * @deprecated deprecated since 1.2, call the constructor if this is necessary
+    */
+    function reset($url, $params = array())
+    {
+        $this->HTTP_Request($url, $params);
+    }
+
+    /**
+    * Sets the URL to be requested
+    *
+    * @param  string The url to be requested
+    * @access public
+    */
+    function setURL($url)
+    {
+        $this->_url = &new Net_URL($url, $this->_useBrackets);
+
+        if (!empty($this->_url->user) || !empty($this->_url->pass)) {
+            $this->setBasicAuth($this->_url->user, $this->_url->pass);
+        }
+
+        if (HTTP_REQUEST_HTTP_VER_1_1 == $this->_http) {
+            $this->addHeader('Host', $this->_generateHostHeader());
+        }
+
+        // set '/' instead of empty path rather than check later (see bug #8662)
+        if (empty($this->_url->path)) {
+            $this->_url->path = '/';
+        } 
+    }
+    
+   /**
+    * Returns the current request URL  
+    *
+    * @return   string  Current request URL
+    * @access   public
+    */
+    function getUrl()
+    {
+        return empty($this->_url)? '': $this->_url->getUrl();
+    }
+
+    /**
+    * Sets a proxy to be used
+    *
+    * @param string     Proxy host
+    * @param int        Proxy port
+    * @param string     Proxy username
+    * @param string     Proxy password
+    * @access public
+    */
+    function setProxy($host, $port = 8080, $user = null, $pass = null)
+    {
+        $this->_proxy_host = $host;
+        $this->_proxy_port = $port;
+        $this->_proxy_user = $user;
+        $this->_proxy_pass = $pass;
+
+        if (!empty($user)) {
+            $this->addHeader('Proxy-Authorization', 'Basic ' . base64_encode($user . ':' . $pass));
+        }
+    }
+
+    /**
+    * Sets basic authentication parameters
+    *
+    * @param string     Username
+    * @param string     Password
+    */
+    function setBasicAuth($user, $pass)
+    {
+        $this->_user = $user;
+        $this->_pass = $pass;
+
+        $this->addHeader('Authorization', 'Basic ' . base64_encode($user . ':' . $pass));
+    }
+
+    /**
+    * Sets the method to be used, GET, POST etc.
+    *
+    * @param string     Method to use. Use the defined constants for this
+    * @access public
+    */
+    function setMethod($method)
+    {
+        $this->_method = $method;
+    }
+
+    /**
+    * Sets the HTTP version to use, 1.0 or 1.1
+    *
+    * @param string     Version to use. Use the defined constants for this
+    * @access public
+    */
+    function setHttpVer($http)
+    {
+        $this->_http = $http;
+    }
+
+    /**
+    * Adds a request header
+    *
+    * @param string     Header name
+    * @param string     Header value
+    * @access public
+    */
+    function addHeader($name, $value)
+    {
+        $this->_requestHeaders[strtolower($name)] = $value;
+    }
+
+    /**
+    * Removes a request header
+    *
+    * @param string     Header name to remove
+    * @access public
+    */
+    function removeHeader($name)
+    {
+        if (isset($this->_requestHeaders[strtolower($name)])) {
+            unset($this->_requestHeaders[strtolower($name)]);
+        }
+    }
+
+    /**
+    * Adds a querystring parameter
+    *
+    * @param string     Querystring parameter name
+    * @param string     Querystring parameter value
+    * @param bool       Whether the value is already urlencoded or not, default = not
+    * @access public
+    */
+    function addQueryString($name, $value, $preencoded = false)
+    {
+        $this->_url->addQueryString($name, $value, $preencoded);
+    }    
+    
+    /**
+    * Sets the querystring to literally what you supply
+    *
+    * @param string     The querystring data. Should be of the format foo=bar&x=y etc
+    * @param bool       Whether data is already urlencoded or not, default = already encoded
+    * @access public
+    */
+    function addRawQueryString($querystring, $preencoded = true)
+    {
+        $this->_url->addRawQueryString($querystring, $preencoded);
+    }
+
+    /**
+    * Adds postdata items
+    *
+    * @param string     Post data name
+    * @param string     Post data value
+    * @param bool       Whether data is already urlencoded or not, default = not
+    * @access public
+    */
+    function addPostData($name, $value, $preencoded = false)
+    {
+        if ($preencoded) {
+            $this->_postData[$name] = $value;
+        } else {
+            $this->_postData[$name] = $this->_arrayMapRecursive('urlencode', $value);
+        }
+    }
+
+   /**
+    * Recursively applies the callback function to the value
+    * 
+    * @param    mixed   Callback function
+    * @param    mixed   Value to process
+    * @access   private
+    * @return   mixed   Processed value
+    */
+    function _arrayMapRecursive($callback, $value)
+    {
+        if (!is_array($value)) {
+            return call_user_func($callback, $value);
+        } else {
+            $map = array();
+            foreach ($value as $k => $v) {
+                $map[$k] = $this->_arrayMapRecursive($callback, $v);
+            }
+            return $map;
+        }
+    }
+
+   /**
+    * Adds a file to upload
+    * 
+    * This also changes content-type to 'multipart/form-data' for proper upload
+    * 
+    * @access public
+    * @param  string    name of file-upload field
+    * @param  mixed     file name(s)
+    * @param  mixed     content-type(s) of file(s) being uploaded
+    * @return bool      true on success
+    * @throws PEAR_Error
+    */
+    function addFile($inputName, $fileName, $contentType = 'application/octet-stream')
+    {
+        if (!is_array($fileName) && !is_readable($fileName)) {
+            return PEAR::raiseError("File '{$fileName}' is not readable", HTTP_REQUEST_ERROR_FILE);
+        } elseif (is_array($fileName)) {
+            foreach ($fileName as $name) {
+                if (!is_readable($name)) {
+                    return PEAR::raiseError("File '{$name}' is not readable", HTTP_REQUEST_ERROR_FILE);
+                }
+            }
+        }
+        $this->addHeader('Content-Type', 'multipart/form-data');
+        $this->_postFiles[$inputName] = array(
+            'name' => $fileName,
+            'type' => $contentType
+        );
+        return true;
+    }
+
+    /**
+    * Adds raw postdata (DEPRECATED)
+    *
+    * @param string     The data
+    * @param bool       Whether data is preencoded or not, default = already encoded
+    * @access public
+    * @deprecated       deprecated since 1.3.0, method setBody() should be used instead
+    */
+    function addRawPostData($postdata, $preencoded = true)
+    {
+        $this->_body = $preencoded ? $postdata : urlencode($postdata);
+    }
+
+   /**
+    * Sets the request body (for POST, PUT and similar requests)
+    *
+    * @param    string  Request body
+    * @access   public
+    */
+    function setBody($body)
+    {
+        $this->_body = $body;
+    }
+
+    /**
+    * Clears any postdata that has been added (DEPRECATED). 
+    * 
+    * Useful for multiple request scenarios.
+    *
+    * @access public
+    * @deprecated deprecated since 1.2
+    */
+    function clearPostData()
+    {
+        $this->_postData = null;
+    }
+
+    /**
+    * Appends a cookie to "Cookie:" header
+    * 
+    * @param string $name cookie name
+    * @param string $value cookie value
+    * @access public
+    */
+    function addCookie($name, $value)
+    {
+        $cookies = isset($this->_requestHeaders['cookie']) ? $this->_requestHeaders['cookie']. '; ' : '';
+        $this->addHeader('Cookie', $cookies . $name . '=' . $value);
+    }
+    
+    /**
+    * Clears any cookies that have been added (DEPRECATED). 
+    * 
+    * Useful for multiple request scenarios
+    *
+    * @access public
+    * @deprecated deprecated since 1.2
+    */
+    function clearCookies()
+    {
+        $this->removeHeader('Cookie');
+    }
+
+    /**
+    * Sends the request
+    *
+    * @access public
+    * @param  bool   Whether to store response body in Response object property,
+    *                set this to false if downloading a LARGE file and using a Listener
+    * @return mixed  PEAR error on error, true otherwise
+    */
+    function sendRequest($saveBody = true)
+    {
+        if (!is_a($this->_url, 'Net_URL')) {
+            return PEAR::raiseError('No URL given', HTTP_REQUEST_ERROR_URL);
+        }
+
+        $host = isset($this->_proxy_host) ? $this->_proxy_host : $this->_url->host;
+        $port = isset($this->_proxy_port) ? $this->_proxy_port : $this->_url->port;
+
+        // 4.3.0 supports SSL connections using OpenSSL. The function test determines
+        // we running on at least 4.3.0
+        if (strcasecmp($this->_url->protocol, 'https') == 0 AND function_exists('file_get_contents') AND extension_loaded('openssl')) {
+            if (isset($this->_proxy_host)) {
+                return PEAR::raiseError('HTTPS proxies are not supported', HTTP_REQUEST_ERROR_PROXY);
+            }
+            $host = 'ssl://' . $host;
+        }
+
+        // magic quotes may fuck up file uploads and chunked response processing
+        $magicQuotes = ini_get('magic_quotes_runtime');
+        ini_set('magic_quotes_runtime', false);
+
+        // RFC 2068, section 19.7.1: A client MUST NOT send the Keep-Alive 
+        // connection token to a proxy server...
+        if (isset($this->_proxy_host) && !empty($this->_requestHeaders['connection']) &&
+            'Keep-Alive' == $this->_requestHeaders['connection'])
+        {
+            $this->removeHeader('connection');
+        }
+
+        $keepAlive = (HTTP_REQUEST_HTTP_VER_1_1 == $this->_http && empty($this->_requestHeaders['connection'])) ||
+                     (!empty($this->_requestHeaders['connection']) && 'Keep-Alive' == $this->_requestHeaders['connection']);
+        $sockets   = &PEAR::getStaticProperty('HTTP_Request', 'sockets');
+        $sockKey   = $host . ':' . $port;
+        unset($this->_sock);
+
+        // There is a connected socket in the "static" property?
+        if ($keepAlive && !empty($sockets[$sockKey]) &&
+            !empty($sockets[$sockKey]->fp)) 
+        {
+            $this->_sock =& $sockets[$sockKey];
+            $err = null;
+        } else {
+            $this->_notify('connect');
+            $this->_sock =& new Net_Socket();
+            $err = $this->_sock->connect($host, $port, null, $this->_timeout, $this->_socketOptions);
+        }
+        PEAR::isError($err) or $err = $this->_sock->write($this->_buildRequest());
+
+        if (!PEAR::isError($err)) {
+            if (!empty($this->_readTimeout)) {
+                $this->_sock->setTimeout($this->_readTimeout[0], $this->_readTimeout[1]);
+            }
+
+            $this->_notify('sentRequest');
+
+            // Read the response
+            $this->_response = &new HTTP_Response($this->_sock, $this->_listeners);
+            $err = $this->_response->process(
+                $this->_saveBody && $saveBody,
+                HTTP_REQUEST_METHOD_HEAD != $this->_method
+            );
+
+            if ($keepAlive) {
+                $keepAlive = (isset($this->_response->_headers['content-length'])
+                              || (isset($this->_response->_headers['transfer-encoding'])
+                                  && strtolower($this->_response->_headers['transfer-encoding']) == 'chunked'));
+                if ($keepAlive) {
+                    if (isset($this->_response->_headers['connection'])) {
+                        $keepAlive = strtolower($this->_response->_headers['connection']) == 'keep-alive';
+                    } else {
+                        $keepAlive = 'HTTP/'.HTTP_REQUEST_HTTP_VER_1_1 == $this->_response->_protocol;
+                    }
+                }
+            }
+        }
+
+        ini_set('magic_quotes_runtime', $magicQuotes);
+
+        if (PEAR::isError($err)) {
+            return $err;
+        }
+
+        if (!$keepAlive) {
+            $this->disconnect();
+        // Store the connected socket in "static" property
+        } elseif (empty($sockets[$sockKey]) || empty($sockets[$sockKey]->fp)) {
+            $sockets[$sockKey] =& $this->_sock;
+        }
+
+        // Check for redirection
+        if (    $this->_allowRedirects
+            AND $this->_redirects <= $this->_maxRedirects
+            AND $this->getResponseCode() > 300
+            AND $this->getResponseCode() < 399
+            AND !empty($this->_response->_headers['location'])) {
+
+            
+            $redirect = $this->_response->_headers['location'];
+
+            // Absolute URL
+            if (preg_match('/^https?:\/\//i', $redirect)) {
+                $this->_url = &new Net_URL($redirect);
+                $this->addHeader('Host', $this->_generateHostHeader());
+            // Absolute path
+            } elseif ($redirect{0} == '/') {
+                $this->_url->path = $redirect;
+            
+            // Relative path
+            } elseif (substr($redirect, 0, 3) == '../' OR substr($redirect, 0, 2) == './') {
+                if (substr($this->_url->path, -1) == '/') {
+                    $redirect = $this->_url->path . $redirect;
+                } else {
+                    $redirect = dirname($this->_url->path) . '/' . $redirect;
+                }
+                $redirect = Net_URL::resolvePath($redirect);
+                $this->_url->path = $redirect;
+                
+            // Filename, no path
+            } else {
+                if (substr($this->_url->path, -1) == '/') {
+                    $redirect = $this->_url->path . $redirect;
+                } else {
+                    $redirect = dirname($this->_url->path) . '/' . $redirect;
+                }
+                $this->_url->path = $redirect;
+            }
+
+            $this->_redirects++;
+            return $this->sendRequest($saveBody);
+
+        // Too many redirects
+        } elseif ($this->_allowRedirects AND $this->_redirects > $this->_maxRedirects) {
+            return PEAR::raiseError('Too many redirects', HTTP_REQUEST_ERROR_REDIRECTS);
+        }
+
+        return true;
+    }
+
+    /**
+     * Disconnect the socket, if connected. Only useful if using Keep-Alive.
+     *
+     * @access public
+     */
+    function disconnect()
+    {
+        if (!empty($this->_sock) && !empty($this->_sock->fp)) {
+            $this->_notify('disconnect');
+            $this->_sock->disconnect();
+        }
+    }
+
+    /**
+    * Returns the response code
+    *
+    * @access public
+    * @return mixed     Response code, false if not set
+    */
+    function getResponseCode()
+    {
+        return isset($this->_response->_code) ? $this->_response->_code : false;
+    }
+
+    /**
+    * Returns either the named header or all if no name given
+    *
+    * @access public
+    * @param string     The header name to return, do not set to get all headers
+    * @return mixed     either the value of $headername (false if header is not present)
+    *                   or an array of all headers
+    */
+    function getResponseHeader($headername = null)
+    {
+        if (!isset($headername)) {
+            return isset($this->_response->_headers)? $this->_response->_headers: array();
+        } else {
+            $headername = strtolower($headername);
+            return isset($this->_response->_headers[$headername]) ? $this->_response->_headers[$headername] : false;
+        }
+    }
+
+    /**
+    * Returns the body of the response
+    *
+    * @access public
+    * @return mixed     response body, false if not set
+    */
+    function getResponseBody()
+    {
+        return isset($this->_response->_body) ? $this->_response->_body : false;
+    }
+
+    /**
+    * Returns cookies set in response
+    * 
+    * @access public
+    * @return mixed     array of response cookies, false if none are present
+    */
+    function getResponseCookies()
+    {
+        return isset($this->_response->_cookies) ? $this->_response->_cookies : false;
+    }
+
+    /**
+    * Builds the request string
+    *
+    * @access private
+    * @return string The request string
+    */
+    function _buildRequest()
+    {
+        $separator = ini_get('arg_separator.output');
+        ini_set('arg_separator.output', '&');
+        $querystring = ($querystring = $this->_url->getQueryString()) ? '?' . $querystring : '';
+        ini_set('arg_separator.output', $separator);
+
+        $host = isset($this->_proxy_host) ? $this->_url->protocol . '://' . $this->_url->host : '';
+        $port = (isset($this->_proxy_host) AND $this->_url->port != 80) ? ':' . $this->_url->port : '';
+        $path = $this->_url->path . $querystring;
+        $url  = $host . $port . $path;
+
+        if (!strlen($url)) {
+            $url = '/';
+        }
+
+        $request = $this->_method . ' ' . $url . ' HTTP/' . $this->_http . "\r\n";
+
+        if (in_array($this->_method, $this->_bodyDisallowed) ||
+            (0 == strlen($this->_body) && (HTTP_REQUEST_METHOD_POST != $this->_method ||
+             (empty($this->_postData) && empty($this->_postFiles)))))
+        {
+            $this->removeHeader('Content-Type');
+        } else {
+            if (empty($this->_requestHeaders['content-type'])) {
+                // Add default content-type
+                $this->addHeader('Content-Type', 'application/x-www-form-urlencoded');
+            } elseif ('multipart/form-data' == $this->_requestHeaders['content-type']) {
+                $boundary = 'HTTP_Request_' . md5(uniqid('request') . microtime());
+                $this->addHeader('Content-Type', 'multipart/form-data; boundary=' . $boundary);
+            }
+        }
+
+        // Request Headers
+        if (!empty($this->_requestHeaders)) {
+            foreach ($this->_requestHeaders as $name => $value) {
+                $canonicalName = implode('-', array_map('ucfirst', explode('-', $name)));
+                $request      .= $canonicalName . ': ' . $value . "\r\n";
+            }
+        }
+
+        // No post data or wrong method, so simply add a final CRLF
+        if (in_array($this->_method, $this->_bodyDisallowed) || 
+            (HTTP_REQUEST_METHOD_POST != $this->_method && 0 == strlen($this->_body))) {
+
+            $request .= "\r\n";
+
+        // Post data if it's an array
+        } elseif (HTTP_REQUEST_METHOD_POST == $this->_method && 
+                  (!empty($this->_postData) || !empty($this->_postFiles))) {
+
+            // "normal" POST request
+            if (!isset($boundary)) {
+                $postdata = implode('&', array_map(
+                    create_function('$a', 'return $a[0] . \'=\' . $a[1];'), 
+                    $this->_flattenArray('', $this->_postData)
+                ));
+
+            // multipart request, probably with file uploads
+            } else {
+                $postdata = '';
+                if (!empty($this->_postData)) {
+                    $flatData = $this->_flattenArray('', $this->_postData);
+                    foreach ($flatData as $item) {
+                        $postdata .= '--' . $boundary . "\r\n";
+                        $postdata .= 'Content-Disposition: form-data; name="' . $item[0] . '"';
+                        $postdata .= "\r\n\r\n" . urldecode($item[1]) . "\r\n";
+                    }
+                }
+                foreach ($this->_postFiles as $name => $value) {
+                    if (is_array($value['name'])) {
+                        $varname       = $name . ($this->_useBrackets? '[]': '');
+                    } else {
+                        $varname       = $name;
+                        $value['name'] = array($value['name']);
+                    }
+                    foreach ($value['name'] as $key => $filename) {
+                        $fp   = fopen($filename, 'r');
+                        $data = fread($fp, filesize($filename));
+                        fclose($fp);
+                        $basename = basename($filename);
+                        $type     = is_array($value['type'])? @$value['type'][$key]: $value['type'];
+
+                        $postdata .= '--' . $boundary . "\r\n";
+                        $postdata .= 'Content-Disposition: form-data; name="' . $varname . '"; filename="' . $basename . '"';
+                        $postdata .= "\r\nContent-Type: " . $type;
+                        $postdata .= "\r\n\r\n" . $data . "\r\n";
+                    }
+                }
+                $postdata .= '--' . $boundary . "--\r\n";
+            }
+            $request .= 'Content-Length: ' .
+                        (HTTP_REQUEST_MBSTRING? mb_strlen($postdata, 'iso-8859-1'): strlen($postdata)) .
+                        "\r\n\r\n";
+            $request .= $postdata;
+
+        // Explicitly set request body
+        } elseif (0 < strlen($this->_body)) {
+
+            $request .= 'Content-Length: ' .
+                        (HTTP_REQUEST_MBSTRING? mb_strlen($this->_body, 'iso-8859-1'): strlen($this->_body)) .
+                        "\r\n\r\n";
+            $request .= $this->_body;
+
+        // Terminate headers with CRLF on POST request with no body, too
+        } else {
+
+            $request .= "\r\n";
+        }
+        
+        return $request;
+    }
+
+   /**
+    * Helper function to change the (probably multidimensional) associative array
+    * into the simple one.
+    *
+    * @param    string  name for item
+    * @param    mixed   item's values
+    * @return   array   array with the following items: array('item name', 'item value');
+    * @access   private
+    */
+    function _flattenArray($name, $values)
+    {
+        if (!is_array($values)) {
+            return array(array($name, $values));
+        } else {
+            $ret = array();
+            foreach ($values as $k => $v) {
+                if (empty($name)) {
+                    $newName = $k;
+                } elseif ($this->_useBrackets) {
+                    $newName = $name . '[' . $k . ']';
+                } else {
+                    $newName = $name;
+                }
+                $ret = array_merge($ret, $this->_flattenArray($newName, $v));
+            }
+            return $ret;
+        }
+    }
+
+
+   /**
+    * Adds a Listener to the list of listeners that are notified of
+    * the object's events
+    * 
+    * Events sent by HTTP_Request object
+    * - 'connect': on connection to server
+    * - 'sentRequest': after the request was sent
+    * - 'disconnect': on disconnection from server
+    *
+    * Events sent by HTTP_Response object
+    * - 'gotHeaders': after receiving response headers (headers are passed in $data)
+    * - 'tick': on receiving a part of response body (the part is passed in $data)
+    * - 'gzTick': on receiving a gzip-encoded part of response body (ditto)
+    * - 'gotBody': after receiving the response body (passes the decoded body in $data if it was gzipped)
+    *
+    * @param    HTTP_Request_Listener   listener to attach
+    * @return   boolean                 whether the listener was successfully attached
+    * @access   public
+    */
+    function attach(&$listener)
+    {
+        if (!is_a($listener, 'HTTP_Request_Listener')) {
+            return false;
+        }
+        $this->_listeners[$listener->getId()] =& $listener;
+        return true;
+    }
+
+
+   /**
+    * Removes a Listener from the list of listeners 
+    * 
+    * @param    HTTP_Request_Listener   listener to detach
+    * @return   boolean                 whether the listener was successfully detached
+    * @access   public
+    */
+    function detach(&$listener)
+    {
+        if (!is_a($listener, 'HTTP_Request_Listener') || 
+            !isset($this->_listeners[$listener->getId()])) {
+            return false;
+        }
+        unset($this->_listeners[$listener->getId()]);
+        return true;
+    }
+
+
+   /**
+    * Notifies all registered listeners of an event.
+    * 
+    * @param    string  Event name
+    * @param    mixed   Additional data
+    * @access   private
+    * @see      HTTP_Request::attach()
+    */
+    function _notify($event, $data = null)
+    {
+        foreach (array_keys($this->_listeners) as $id) {
+            $this->_listeners[$id]->update($this, $event, $data);
+        }
+    }
+}
+
+
+/**
+ * Response class to complement the Request class
+ *
+ * @category    HTTP
+ * @package     HTTP_Request
+ * @author      Richard Heyes <richard@phpguru.org>
+ * @author      Alexey Borzov <avb@php.net>
+ * @version     Release: 1.4.2
+ */
+class HTTP_Response
+{
+    /**
+    * Socket object
+    * @var Net_Socket
+    */
+    var $_sock;
+
+    /**
+    * Protocol
+    * @var string
+    */
+    var $_protocol;
+    
+    /**
+    * Return code
+    * @var string
+    */
+    var $_code;
+    
+    /**
+    * Response headers
+    * @var array
+    */
+    var $_headers;
+
+    /**
+    * Cookies set in response  
+    * @var array
+    */
+    var $_cookies;
+
+    /**
+    * Response body
+    * @var string
+    */
+    var $_body = '';
+
+   /**
+    * Used by _readChunked(): remaining length of the current chunk
+    * @var string
+    */
+    var $_chunkLength = 0;
+
+   /**
+    * Attached listeners
+    * @var array
+    */
+    var $_listeners = array();
+
+   /**
+    * Bytes left to read from message-body
+    * @var null|int
+    */
+    var $_toRead;
+
+    /**
+    * Constructor
+    *
+    * @param  Net_Socket    socket to read the response from
+    * @param  array         listeners attached to request
+    */
+    function HTTP_Response(&$sock, &$listeners)
+    {
+        $this->_sock      =& $sock;
+        $this->_listeners =& $listeners;
+    }
+
+
+   /**
+    * Processes a HTTP response
+    * 
+    * This extracts response code, headers, cookies and decodes body if it 
+    * was encoded in some way
+    *
+    * @access public
+    * @param  bool      Whether to store response body in object property, set
+    *                   this to false if downloading a LARGE file and using a Listener.
+    *                   This is assumed to be true if body is gzip-encoded.
+    * @param  bool      Whether the response can actually have a message-body.
+    *                   Will be set to false for HEAD requests.
+    * @throws PEAR_Error
+    * @return mixed     true on success, PEAR_Error in case of malformed response
+    */
+    function process($saveBody = true, $canHaveBody = true)
+    {
+        do {
+            $line = $this->_sock->readLine();
+            if (sscanf($line, 'HTTP/%s %s', $http_version, $returncode) != 2) {
+                return PEAR::raiseError('Malformed response', HTTP_REQUEST_ERROR_RESPONSE);
+            } else {
+                $this->_protocol = 'HTTP/' . $http_version;
+                $this->_code     = intval($returncode);
+            }
+            while ('' !== ($header = $this->_sock->readLine())) {
+                $this->_processHeader($header);
+            }
+        } while (100 == $this->_code);
+
+        $this->_notify('gotHeaders', $this->_headers);
+
+        // RFC 2616, section 4.4:
+        // 1. Any response message which "MUST NOT" include a message-body ... 
+        // is always terminated by the first empty line after the header fields 
+        // 3. ... If a message is received with both a
+        // Transfer-Encoding header field and a Content-Length header field,
+        // the latter MUST be ignored.
+        $canHaveBody = $canHaveBody && $this->_code >= 200 && 
+                       $this->_code != 204 && $this->_code != 304;
+
+        // If response body is present, read it and decode
+        $chunked = isset($this->_headers['transfer-encoding']) && ('chunked' == $this->_headers['transfer-encoding']);
+        $gzipped = isset($this->_headers['content-encoding']) && ('gzip' == $this->_headers['content-encoding']);
+        $hasBody = false;
+        if ($canHaveBody && ($chunked || !isset($this->_headers['content-length']) || 
+                0 != $this->_headers['content-length']))
+        {
+            if ($chunked || !isset($this->_headers['content-length'])) {
+                $this->_toRead = null;
+            } else {
+                $this->_toRead = $this->_headers['content-length'];
+            }
+            while (!$this->_sock->eof() && (is_null($this->_toRead) || 0 < $this->_toRead)) {
+                if ($chunked) {
+                    $data = $this->_readChunked();
+                } elseif (is_null($this->_toRead)) {
+                    $data = $this->_sock->read(4096);
+                } else {
+                    $data = $this->_sock->read(min(4096, $this->_toRead));
+                    $this->_toRead -= HTTP_REQUEST_MBSTRING? mb_strlen($data, 'iso-8859-1'): strlen($data);
+                }
+                if ('' == $data) {
+                    break;
+                } else {
+                    $hasBody = true;
+                    if ($saveBody || $gzipped) {
+                        $this->_body .= $data;
+                    }
+                    $this->_notify($gzipped? 'gzTick': 'tick', $data);
+                }
+            }
+        }
+
+        if ($hasBody) {
+            // Uncompress the body if needed
+            if ($gzipped) {
+                $body = $this->_decodeGzip($this->_body);
+                if (PEAR::isError($body)) {
+                    return $body;
+                }
+                $this->_body = $body;
+                $this->_notify('gotBody', $this->_body);
+            } else {
+                $this->_notify('gotBody');
+            }
+        }
+        return true;
+    }
+
+
+   /**
+    * Processes the response header
+    *
+    * @access private
+    * @param  string    HTTP header
+    */
+    function _processHeader($header)
+    {
+        if (false === strpos($header, ':')) {
+            return;
+        }
+        list($headername, $headervalue) = explode(':', $header, 2);
+        $headername  = strtolower($headername);
+        $headervalue = ltrim($headervalue);
+        
+        if ('set-cookie' != $headername) {
+            if (isset($this->_headers[$headername])) {
+                $this->_headers[$headername] .= ',' . $headervalue;
+            } else {
+                $this->_headers[$headername]  = $headervalue;
+            }
+        } else {
+            $this->_parseCookie($headervalue);
+        }
+    }
+
+
+   /**
+    * Parse a Set-Cookie header to fill $_cookies array
+    *
+    * @access private
+    * @param  string    value of Set-Cookie header
+    */
+    function _parseCookie($headervalue)
+    {
+        $cookie = array(
+            'expires' => null,
+            'domain'  => null,
+            'path'    => null,
+            'secure'  => false
+        );
+
+        // Only a name=value pair
+        if (!strpos($headervalue, ';')) {
+            $pos = strpos($headervalue, '=');
+            $cookie['name']  = trim(substr($headervalue, 0, $pos));
+            $cookie['value'] = trim(substr($headervalue, $pos + 1));
+
+        // Some optional parameters are supplied
+        } else {
+            $elements = explode(';', $headervalue);
+            $pos = strpos($elements[0], '=');
+            $cookie['name']  = trim(substr($elements[0], 0, $pos));
+            $cookie['value'] = trim(substr($elements[0], $pos + 1));
+
+            for ($i = 1; $i < count($elements); $i++) {
+                if (false === strpos($elements[$i], '=')) {
+                    $elName  = trim($elements[$i]);
+                    $elValue = null;
+                } else {
+                    list ($elName, $elValue) = array_map('trim', explode('=', $elements[$i]));
+                }
+                $elName = strtolower($elName);
+                if ('secure' == $elName) {
+                    $cookie['secure'] = true;
+                } elseif ('expires' == $elName) {
+                    $cookie['expires'] = str_replace('"', '', $elValue);
+                } elseif ('path' == $elName || 'domain' == $elName) {
+                    $cookie[$elName] = urldecode($elValue);
+                } else {
+                    $cookie[$elName] = $elValue;
+                }
+            }
+        }
+        $this->_cookies[] = $cookie;
+    }
+
+
+   /**
+    * Read a part of response body encoded with chunked Transfer-Encoding
+    * 
+    * @access private
+    * @return string
+    */
+    function _readChunked()
+    {
+        // at start of the next chunk?
+        if (0 == $this->_chunkLength) {
+            $line = $this->_sock->readLine();
+            if (preg_match('/^([0-9a-f]+)/i', $line, $matches)) {
+                $this->_chunkLength = hexdec($matches[1]); 
+                // Chunk with zero length indicates the end
+                if (0 == $this->_chunkLength) {
+                    $this->_sock->readLine(); // make this an eof()
+                    return '';
+                }
+            } else {
+                return '';
+            }
+        }
+        $data = $this->_sock->read($this->_chunkLength);
+        $this->_chunkLength -= HTTP_REQUEST_MBSTRING? mb_strlen($data, 'iso-8859-1'): strlen($data);
+        if (0 == $this->_chunkLength) {
+            $this->_sock->readLine(); // Trailing CRLF
+        }
+        return $data;
+    }
+
+
+   /**
+    * Notifies all registered listeners of an event.
+    * 
+    * @param    string  Event name
+    * @param    mixed   Additional data
+    * @access   private
+    * @see HTTP_Request::_notify()
+    */
+    function _notify($event, $data = null)
+    {
+        foreach (array_keys($this->_listeners) as $id) {
+            $this->_listeners[$id]->update($this, $event, $data);
+        }
+    }
+
+
+   /**
+    * Decodes the message-body encoded by gzip
+    *
+    * The real decoding work is done by gzinflate() built-in function, this
+    * method only parses the header and checks data for compliance with
+    * RFC 1952  
+    *
+    * @access   private
+    * @param    string  gzip-encoded data
+    * @return   string  decoded data
+    */
+    function _decodeGzip($data)
+    {
+        if (HTTP_REQUEST_MBSTRING) {
+            $oldEncoding = mb_internal_encoding();
+            mb_internal_encoding('iso-8859-1');
+        }
+        $length = strlen($data);
+        // If it doesn't look like gzip-encoded data, don't bother
+        if (18 > $length || strcmp(substr($data, 0, 2), "\x1f\x8b")) {
+            return $data;
+        }
+        $method = ord(substr($data, 2, 1));
+        if (8 != $method) {
+            return PEAR::raiseError('_decodeGzip(): unknown compression method', HTTP_REQUEST_ERROR_GZIP_METHOD);
+        }
+        $flags = ord(substr($data, 3, 1));
+        if ($flags & 224) {
+            return PEAR::raiseError('_decodeGzip(): reserved bits are set', HTTP_REQUEST_ERROR_GZIP_DATA);
+        }
+
+        // header is 10 bytes minimum. may be longer, though.
+        $headerLength = 10;
+        // extra fields, need to skip 'em
+        if ($flags & 4) {
+            if ($length - $headerLength - 2 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $extraLength = unpack('v', substr($data, 10, 2));
+            if ($length - $headerLength - 2 - $extraLength[1] < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $headerLength += $extraLength[1] + 2;
+        }
+        // file name, need to skip that
+        if ($flags & 8) {
+            if ($length - $headerLength - 1 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $filenameLength = strpos(substr($data, $headerLength), chr(0));
+            if (false === $filenameLength || $length - $headerLength - $filenameLength - 1 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $headerLength += $filenameLength + 1;
+        }
+        // comment, need to skip that also
+        if ($flags & 16) {
+            if ($length - $headerLength - 1 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $commentLength = strpos(substr($data, $headerLength), chr(0));
+            if (false === $commentLength || $length - $headerLength - $commentLength - 1 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $headerLength += $commentLength + 1;
+        }
+        // have a CRC for header. let's check
+        if ($flags & 1) {
+            if ($length - $headerLength - 2 < 8) {
+                return PEAR::raiseError('_decodeGzip(): data too short', HTTP_REQUEST_ERROR_GZIP_DATA);
+            }
+            $crcReal   = 0xffff & crc32(substr($data, 0, $headerLength));
+            $crcStored = unpack('v', substr($data, $headerLength, 2));
+            if ($crcReal != $crcStored[1]) {
+                return PEAR::raiseError('_decodeGzip(): header CRC check failed', HTTP_REQUEST_ERROR_GZIP_CRC);
+            }
+            $headerLength += 2;
+        }
+        // unpacked data CRC and size at the end of encoded data
+        $tmp = unpack('V2', substr($data, -8));
+        $dataCrc  = $tmp[1];
+        $dataSize = $tmp[2];
+
+        // finally, call the gzinflate() function
+        $unpacked = @gzinflate(substr($data, $headerLength, -8), $dataSize);
+        if (false === $unpacked) {
+            return PEAR::raiseError('_decodeGzip(): gzinflate() call failed', HTTP_REQUEST_ERROR_GZIP_READ);
+        } elseif ($dataSize != strlen($unpacked)) {
+            return PEAR::raiseError('_decodeGzip(): data size check failed', HTTP_REQUEST_ERROR_GZIP_READ);
+        } elseif ((0xffffffff & $dataCrc) != (0xffffffff & crc32($unpacked))) {
+            return PEAR::raiseError('_decodeGzip(): data CRC check failed', HTTP_REQUEST_ERROR_GZIP_CRC);
+        }
+        if (HTTP_REQUEST_MBSTRING) {
+            mb_internal_encoding($oldEncoding);
+        }
+        return $unpacked;
+    }
+} // End class HTTP_Response
+?>
diff --git a/lib/phpFlickr/PEAR/HTTP/Request/Listener.php b/lib/phpFlickr/PEAR/HTTP/Request/Listener.php
new file mode 100644
index 000000000..b00514206
--- /dev/null
+++ b/lib/phpFlickr/PEAR/HTTP/Request/Listener.php
@@ -0,0 +1,106 @@
+<?php
+/**
+ * Listener for HTTP_Request and HTTP_Response objects
+ *
+ * PHP versions 4 and 5
+ * 
+ * LICENSE:
+ *
+ * Copyright (c) 2002-2007, Richard Heyes
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * o Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * o 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.
+ * o The names of the authors may not 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.
+ *
+ * @category    HTTP
+ * @package     HTTP_Request
+ * @author      Alexey Borzov <avb@php.net>
+ * @copyright   2002-2007 Richard Heyes
+ * @license     http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version     CVS: $Id: Listener.php 127 2008-01-17 20:21:37Z dcoulter $
+ * @link        http://pear.php.net/package/HTTP_Request/ 
+ */
+
+/**
+ * Listener for HTTP_Request and HTTP_Response objects
+ *
+ * This class implements the Observer part of a Subject-Observer
+ * design pattern.
+ *
+ * @category    HTTP
+ * @package     HTTP_Request
+ * @author      Alexey Borzov <avb@php.net>
+ * @version     Release: 1.4.2
+ */
+class HTTP_Request_Listener 
+{
+   /**
+    * A listener's identifier
+    * @var string
+    */
+    var $_id;
+
+   /**
+    * Constructor, sets the object's identifier
+    *
+    * @access public
+    */
+    function HTTP_Request_Listener()
+    {
+        $this->_id = md5(uniqid('http_request_', 1));
+    }
+
+
+   /**
+    * Returns the listener's identifier
+    *
+    * @access public
+    * @return string
+    */
+    function getId()
+    {
+        return $this->_id;
+    }
+
+
+   /**
+    * This method is called when Listener is notified of an event
+    *
+    * @access   public
+    * @param    object  an object the listener is attached to
+    * @param    string  Event name
+    * @param    mixed   Additional data
+    * @abstract
+    */
+    function update(&$subject, $event, $data = null)
+    {
+        echo "Notified of event: '$event'\n";
+        if (null !== $data) {
+            echo "Additional data: ";
+            var_dump($data);
+        }
+    }
+}
+?>