change platform name to redmatrix (lowercase, one word) for use in meta tags and stuff, move yet another oauth1 library to library instead of having it in plugins where we'll end up with a white screen if we re-use it in another plugin; which I plan to do.

1 files changed, 2176 insertions, 0 deletions

diff --git a/library/oauth/oauth_client.php b/library/oauth/oauth_client.php
new file mode 100644
index 000000000..5047e0e9b
--- /dev/null
+++ b/library/oauth/oauth_client.php
@@ -0,0 +1,2176 @@
+<?php
+/*
+ * oauth_client.php
+ *
+ * @(#) $Id: oauth_client.php,v 1.58 2013/04/11 09:33:16 mlemos Exp $
+ *
+ */
+
+/*
+{metadocument}<?xml version="1.0" encoding="ISO-8859-1" ?>
+<class>
+
+	<package>net.manuellemos.oauth</package>
+
+	<version>@(#) $Id: oauth_client.php,v 1.58 2013/04/11 09:33:16 mlemos Exp $</version>
+	<copyright>Copyright © (C) Manuel Lemos 2012</copyright>
+	<title>OAuth client</title>
+	<author>Manuel Lemos</author>
+	<authoraddress>mlemos-at-acm.org</authoraddress>
+
+	<documentation>
+		<idiom>en</idiom>
+		<purpose>This class serves two main purposes:<paragraphbreak />
+			1) Implement the OAuth protocol to retrieve a token from a server to
+			authorize the access to an API on behalf of the current
+			user.<paragraphbreak />
+			2) Perform calls to a Web services API using a token previously
+			obtained using this class or a token provided some other way by the
+			Web services provider.</purpose>
+		<usage>Regardless of your purposes, you always need to start calling
+			the class <functionlink>Initialize</functionlink> function after
+			initializing setup variables. After you are done with the class,
+			always call the <functionlink>Finalize</functionlink> function at
+			the end.<paragraphbreak />
+			This class supports either OAuth protocol versions 1.0, 1.0a and
+			2.0. It abstracts the differences between these protocol versions,
+			so the class usage is the same independently of the OAuth
+			version of the server.<paragraphbreak />
+			The class also provides built-in support to several popular OAuth
+			servers, so you do not have to manually configure all the details to
+			access those servers. Just set the
+			<variablelink>server</variablelink> variable to configure the class
+			to access one of the built-in supported servers.<paragraphbreak />
+			If you need to access one type of server that is not yet directly
+			supported by the class, you need to configure it explicitly setting
+			the variables: <variablelink>oauth_version</variablelink>,
+			<variablelink>url_parameters</variablelink>,
+			<variablelink>authorization_header</variablelink>,
+			<variablelink>request_token_url</variablelink>,
+			<variablelink>dialog_url</variablelink>,
+			<variablelink>offline_dialog_url</variablelink>,
+			<variablelink>append_state_to_redirect_uri</variablelink> and
+			<variablelink>access_token_url</variablelink>.<paragraphbreak />
+			Before proceeding to the actual OAuth authorization process, you
+			need to have registered your application with the OAuth server. The
+			registration provides you values to set the variables
+			<variablelink>client_id</variablelink> and 
+			<variablelink>client_secret</variablelink>.<paragraphbreak />
+			You also need to set the variables
+			<variablelink>redirect_uri</variablelink> and
+			<variablelink>scope</variablelink> before calling the
+			<functionlink>Process</functionlink> function to make the class
+			perform the necessary interactions with the OAuth
+			server.<paragraphbreak />
+			The OAuth protocol involves multiple steps that include redirection
+			to the OAuth server. There it asks permission to the current user to
+			grant your application access to APIs on his/her behalf. When there
+			is a redirection, the class will set the
+			<variablelink>exit</variablelink> variable to
+			<booleanvalue>1</booleanvalue>. Then your script should exit
+			immediately without outputting anything.<paragraphbreak />
+			When the OAuth access token is successfully obtained, the following
+			variables are set by the class with the obtained values:
+			<variablelink>access_token</variablelink>,
+			<variablelink>access_token_secret</variablelink>,
+			<variablelink>access_token_expiry</variablelink>,
+			<variablelink>access_token_type</variablelink>. You may want to
+			store these values to use them later when calling the server
+			APIs.<paragraphbreak />
+			If there was a problem during OAuth authorization process, check the
+			variable <variablelink>authorization_error</variablelink> to
+			determine the reason.<paragraphbreak />
+			Once you get the access token, you can call the server APIs using
+			the <functionlink>CallAPI</functionlink> function. Check the
+			<variablelink>access_token_error</variablelink> variable to
+			determine if there was an error when trying to to call the
+			API.<paragraphbreak />
+			If for some reason the user has revoked the access to your
+			application, you need to ask the user to authorize your application
+			again. First you may need to call the function
+			<functionlink>ResetAccessToken</functionlink> to reset the value of
+			the access token that may be cached in session variables.</usage>
+	</documentation>
+
+{/metadocument}
+*/
+
+class oauth_client_class
+{
+/*
+{metadocument}
+	<variable>
+		<name>error</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Store the message that is returned when an error
+				occurs.</purpose>
+			<usage>Check this variable to understand what happened when a call to
+				any of the class functions has failed.<paragraphbreak />
+				This class uses cumulative error handling. This means that if one
+				class functions that may fail is called and this variable was
+				already set to an error message due to a failure in a previous call
+				to the same or other function, the function will also fail and does
+				not do anything.<paragraphbreak />
+				This allows programs using this class to safely call several
+				functions that may fail and only check the failure condition after
+				the last function call.<paragraphbreak />
+				Just set this variable to an empty string to clear the error
+				condition.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $error = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>debug</name>
+		<type>BOOLEAN</type>
+		<value>0</value>
+		<documentation>
+			<purpose>Control whether debug output is enabled</purpose>
+			<usage>Set this variable to <booleanvalue>1</booleanvalue> if you
+				need to check what is going on during calls to the class. When
+				enabled, the debug output goes either to the variable
+				<variablelink>debug_output</variablelink> and the PHP error log.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $debug = false;
+
+/*
+{metadocument}
+	<variable>
+		<name>debug_http</name>
+		<type>BOOLEAN</type>
+		<value>0</value>
+		<documentation>
+			<purpose>Control whether the dialog with the remote Web server
+				should also be logged.</purpose>
+			<usage>Set this variable to <booleanvalue>1</booleanvalue> if you
+				want to inspect the data exchange with the OAuth server.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $debug_http = false;
+
+/*
+{metadocument}
+	<variable>
+		<name>exit</name>
+		<type>BOOLEAN</type>
+		<value>0</value>
+		<documentation>
+			<purpose>Determine if the current script should be exited.</purpose>
+			<usage>Check this variable after calling the
+				<functionlink>Process</functionlink> function and exit your script
+				immediately if the variable is set to
+				<booleanvalue>1</booleanvalue>.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $exit = false;
+
+/*
+{metadocument}
+	<variable>
+		<name>debug_output</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Capture the debug output generated by the class</purpose>
+			<usage>Inspect this variable if you need to see what happened during
+				the class function calls.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $debug_output = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>debug_prefix</name>
+		<type>STRING</type>
+		<value>OAuth client: </value>
+		<documentation>
+			<purpose>Mark the lines of the debug output to identify actions
+				performed by this class.</purpose>
+			<usage>Change this variable if you prefer the debug output lines to
+				be prefixed with a different text.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $debug_prefix = 'OAuth client: ';
+
+/*
+{metadocument}
+	<variable>
+		<name>server</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Identify the type of OAuth server to access.</purpose>
+			<usage>The class provides built-in support to several types of OAuth
+				servers. This means that the class can automatically initialize
+				several configuration variables just by setting this server
+				variable.<paragraphbreak />
+				Currently it supports the following servers:
+				<stringvalue>Bitbucket</stringvalue>,
+				<stringvalue>Box</stringvalue>,
+				<stringvalue>Dropbox</stringvalue>,
+				<stringvalue>Eventful</stringvalue>,
+				<stringvalue>Facebook</stringvalue>,
+				<stringvalue>Fitbit</stringvalue>,
+				<stringvalue>Flickr</stringvalue>,
+				<stringvalue>Foursquare</stringvalue>,
+				<stringvalue>github</stringvalue>,
+				<stringvalue>Google</stringvalue>,
+				<stringvalue>Instagram</stringvalue>,
+				<stringvalue>LinkedIn</stringvalue>,
+				<stringvalue>Microsoft</stringvalue>,
+				<stringvalue>Scoop.it</stringvalue>,
+				<stringvalue>StockTwits</stringvalue>,
+				<stringvalue>Tumblr</stringvalue>,
+				<stringvalue>Twitter</stringvalue>,
+				<stringvalue>XING</stringvalue> and
+				<stringvalue>Yahoo</stringvalue>. Please contact the author if you
+				would like to ask to add built-in support for other types of OAuth
+				servers.<paragraphbreak />
+				If you want to access other types of OAuth servers that are not
+				yet supported, set this variable to an empty string and configure
+				other variables with values specific to those servers.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $server = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>request_token_url</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>URL of the OAuth server to request the initial token for
+				OAuth 1.0 and 1.0a servers.</purpose>
+			<usage>Set this variable to the OAuth request token URL when you are
+				not accessing one of the built-in supported OAuth
+				servers.<paragraphbreak />
+				For OAuth 1.0 and 1.0a servers, the request token URL can have
+				certain marks that will act as template placeholders which will be
+				replaced with given values before requesting the authorization
+				token. Currently it supports the following placeholder
+				marks:<paragraphbreak />
+				{SCOPE} - scope of the requested permissions to the granted by the
+				OAuth server with the user permissions</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $request_token_url = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>dialog_url</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>URL of the OAuth server to redirect the browser so the user
+				can grant access to your application.</purpose>
+			<usage>Set this variable to the OAuth request token URL when you are
+				not accessing one of the built-in supported OAuth servers.<paragraphbreak />
+				For certain servers, the dialog URL can have certain marks that
+				will act as template placeholders which will be replaced with
+				values defined before redirecting the users browser. Currently it
+				supports the following placeholder marks:<paragraphbreak />
+				{REDIRECT_URI} - URL to redirect when returning from the OAuth
+				server authorization page<paragraphbreak />
+				{CLIENT_ID} - client application identifier registered at the
+				server<paragraphbreak />
+				{SCOPE} - scope of the requested permissions to the granted by the
+				OAuth server with the user permissions<paragraphbreak />
+				{STATE} - identifier of the OAuth session state</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $dialog_url = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>offline_dialog_url</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>URL of the OAuth server to redirect the browser so the user
+				can grant access to your application when offline access is
+				requested.</purpose>
+			<usage>Set this variable to the OAuth request token URL when you are
+				not accessing one of the built-in supported OAuth servers and the
+				OAuth server supports offline access.<paragraphbreak />
+				It should have the same format as the
+				<variablelink>dialog_url</variablelink> variable.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $offline_dialog_url = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>append_state_to_redirect_uri</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Pass the OAuth session state in a variable with a different
+				name to work around implementation bugs of certain OAuth
+				servers</purpose>
+			<usage>Set this variable  when you are not accessing one of the
+				built-in supported OAuth servers if the OAuth server has a bug
+				that makes it not pass back the OAuth state identifier in a
+				request variable named state.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $append_state_to_redirect_uri = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token_url</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>OAuth server URL that will return the access token
+				URL.</purpose>
+			<usage>Set this variable to the OAuth access token URL when you are
+				not accessing one of the built-in supported OAuth servers.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token_url = '';
+
+
+/*
+{metadocument}
+	<variable>
+		<name>oauth_version</name>
+		<type>STRING</type>
+		<value>2.0</value>
+		<documentation>
+			<purpose>Version of the protocol version supported by the OAuth
+				server.</purpose>
+			<usage>Set this variable to the OAuth server protocol version when
+				you are not accessing one of the built-in supported OAuth
+				servers.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $oauth_version = '2.0';
+
+/*
+{metadocument}
+	<variable>
+		<name>url_parameters</name>
+		<type>BOOLEAN</type>
+		<value>0</value>
+		<documentation>
+			<purpose>Determine if the API call parameters should be moved to the
+				call URL.</purpose>
+			<usage>Set this variable to <booleanvalue>1</booleanvalue> if the
+				API you need to call requires that the call parameters always be
+				passed via the API URL.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $url_parameters = false;
+
+/*
+{metadocument}
+	<variable>
+		<name>authorization_header</name>
+		<type>BOOLEAN</type>
+		<value>1</value>
+		<documentation>
+			<purpose>Determine if the OAuth parameters should be passed via HTTP
+				Authorization request header.</purpose>
+			<usage>Set this variable to <booleanvalue>1</booleanvalue> if the
+				OAuth server requires that the OAuth parameters be passed using
+				the HTTP Authorization instead of the request URI parameters.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $authorization_header = true;
+
+/*
+{metadocument}
+	<variable>
+		<name>token_request_method</name>
+		<type>STRING</type>
+		<value>GET</value>
+		<documentation>
+			<purpose>Define the HTTP method that should be used to request
+				tokens from the server.</purpose>
+			<usage>Set this variable to <stringvalue>POST</stringvalue> if the
+				OAuth server does not support requesting tokens using the HTTP GET
+				method.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $token_request_method = 'GET';
+
+/*
+{metadocument}
+	<variable>
+		<name>signature_method</name>
+		<type>STRING</type>
+		<value>HMAC-SHA1</value>
+		<documentation>
+			<purpose>Define the method to generate the signature for API request
+				parameters values.</purpose>
+			<usage>Currently it supports <stringvalue>PLAINTEXT</stringvalue>
+				and <stringvalue>HMAC-SHA1</stringvalue>.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $signature_method = 'HMAC-SHA1';
+
+/*
+{metadocument}
+	<variable>
+		<name>redirect_uri</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>URL of the current script page that is calling this
+				class</purpose>
+			<usage>Set this variable to the current script page URL before
+				proceeding the the OAuth authorization process.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $redirect_uri = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>client_id</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Identifier of your application registered with the OAuth
+				server</purpose>
+			<usage>Set this variable to the application identifier that is
+				provided by the OAuth server when you register the
+				application.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $client_id = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>client_secret</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Secret value assigned to your application when it is
+				registered with the OAuth server.</purpose>
+			<usage>Set this variable to the application secret that is provided
+				by the OAuth server when you register the application.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $client_secret = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>scope</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Permissions that your application needs to call the OAuth
+				server APIs</purpose>
+			<usage>Check the documentation of the APIs that your application
+				needs to call to set this variable with the identifiers of the
+				permissions that the user needs to grant to your application.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $scope = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>offline</name>
+		<type>BOOLEAN</type>
+		<value>0</value>
+		<documentation>
+			<purpose>Specify whether it will be necessary to call the API when
+				the user is not present and the server supports renewing expired
+				access tokens using refresh tokens.</purpose>
+			<usage>Set this variable to <booleanvalue>1</booleanvalue> if the
+				server supports renewing expired tokens automatically when the
+				user is not present.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $offline = false;
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Access token obtained from the OAuth server</purpose>
+			<usage>Check this variable to get the obtained access token upon
+				successful OAuth authorization.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token_secret</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Access token secret obtained from the OAuth server</purpose>
+			<usage>If the OAuth protocol version is 1.0 or 1.0a, check this
+				variable to get the obtained access token secret upon successful
+				OAuth authorization.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token_secret = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token_expiry</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Timestamp of the expiry of the access token obtained from
+				the OAuth server.</purpose>
+			<usage>Check this variable to get the obtained access token expiry
+				time upon successful OAuth authorization. If this variable is
+				empty, that means no expiry time was set.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token_expiry = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token_type</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Type of access token obtained from the OAuth server.</purpose>
+			<usage>Check this variable to get the obtained access token type
+				upon successful OAuth authorization.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token_type = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>refresh_token</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Refresh token obtained from the OAuth server</purpose>
+			<usage>Check this variable to get the obtained refresh token upon
+				successful OAuth authorization.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $refresh_token = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>access_token_error</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Error message returned when a call to the API fails.</purpose>
+			<usage>Check this variable to determine if there was an error while
+				calling the Web services API when using the
+				<functionlink>CallAPI</functionlink> function.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $access_token_error = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>authorization_error</name>
+		<type>STRING</type>
+		<value></value>
+		<documentation>
+			<purpose>Error message returned when it was not possible to obtain
+				an OAuth access token</purpose>
+			<usage>Check this variable to determine if there was an error while
+				trying to obtain the OAuth access token.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $authorization_error = '';
+
+/*
+{metadocument}
+	<variable>
+		<name>response_status</name>
+		<type>INTEGER</type>
+		<value>0</value>
+		<documentation>
+			<purpose>HTTP response status returned by the server when calling an
+				API</purpose>
+			<usage>Check this variable after calling the
+				<functionlink>CallAPI</functionlink> function if the API calls and you
+				need to process the error depending the response status.
+				<integervalue>200</integervalue> means no error. 
+				<integervalue>0</integervalue> means the server response was not
+				retrieved.</usage>
+		</documentation>
+	</variable>
+{/metadocument}
+*/
+	var $response_status = 0;
+
+	var $oauth_user_agent = 'PHP-OAuth-API (http://www.phpclasses.org/oauth-api $Revision: 1.58 $)';
+	var $session_started = false;
+
+	Function SetError($error)
+	{
+		$this->error = $error;
+		if($this->debug)
+			$this->OutputDebug('Error: '.$error);
+		return(false);
+	}
+
+	Function SetPHPError($error, &$php_error_message)
+	{
+		if(IsSet($php_error_message)
+		&& strlen($php_error_message))
+			$error.=": ".$php_error_message;
+		return($this->SetError($error));
+	}
+
+	Function OutputDebug($message)
+	{
+		if($this->debug)
+		{
+			$message = $this->debug_prefix.$message;
+			$this->debug_output .= $message."\n";;
+			error_log($message);
+		}
+		return(true);
+	}
+
+	Function GetRequestTokenURL(&$request_token_url)
+	{
+		$request_token_url = $this->request_token_url;
+		return(true);
+	}
+
+	Function GetDialogURL(&$url, $redirect_uri = '', $state = '')
+	{
+		$url = (($this->offline && strlen($this->offline_dialog_url)) ? $this->offline_dialog_url : $this->dialog_url);
+		if(strlen($url) === 0)
+			return $this->SetError('the dialog URL '.($this->offline ? 'for offline access ' : '').'is not defined for this server');
+		$url = str_replace(
+			'{REDIRECT_URI}', UrlEncode($redirect_uri), str_replace(
+			'{STATE}', UrlEncode($state), str_replace(
+			'{CLIENT_ID}', UrlEncode($this->client_id), str_replace(
+			'{SCOPE}', UrlEncode($this->scope),
+			$url))));
+		return(true);
+	}
+
+	Function GetAccessTokenURL(&$access_token_url)
+	{
+		$access_token_url = $this->access_token_url;
+		return(true);
+	}
+
+	Function GetStoredState(&$state)
+	{
+		if(!$this->session_started)
+		{
+			if(!function_exists('session_start'))
+				return $this->SetError('Session variables are not accessible in this PHP environment');
+		}
+		if(IsSet($_SESSION['OAUTH_STATE']))
+			$state = $_SESSION['OAUTH_STATE'];
+		else
+			$state = $_SESSION['OAUTH_STATE'] = time().'-'.substr(md5(rand().time()), 0, 6);
+		return(true);
+	}
+
+	Function GetRequestState(&$state)
+	{
+		$check = (strlen($this->append_state_to_redirect_uri) ? $this->append_state_to_redirect_uri : 'state');
+		$state = (IsSet($_GET[$check]) ? $_GET[$check] : null);
+		return(true);
+	}
+
+	Function GetRequestCode(&$code)
+	{
+		$code = (IsSet($_GET['code']) ? $_GET['code'] : null);
+		return(true);
+	}
+
+	Function GetRequestError(&$error)
+	{
+		$error = (IsSet($_GET['error']) ? $_GET['error'] : null);
+		return(true);
+	}
+
+	Function GetRequestDenied(&$denied)
+	{
+		$denied = (IsSet($_GET['denied']) ? $_GET['denied'] : null);
+		return(true);
+	}
+
+	Function GetRequestToken(&$token, &$verifier)
+	{
+		$token = (IsSet($_GET['oauth_token']) ? $_GET['oauth_token'] : null);
+		$verifier = (IsSet($_GET['oauth_verifier']) ? $_GET['oauth_verifier'] : null);
+		return(true);
+	}
+
+	Function GetRedirectURI(&$redirect_uri)
+	{
+		if(strlen($this->redirect_uri))
+			$redirect_uri = $this->redirect_uri;
+		else
+			$redirect_uri = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
+		return true;
+	}
+
+/*
+{metadocument}
+	<function>
+		<name>StoreAccessToken</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Store the values of the access token when it is succefully
+				retrieved from the OAuth server.</purpose>
+			<usage>This function is meant to be only be called from inside the
+				class. By default it stores access tokens in a session variable
+				named <stringvalue>OAUTH_ACCESS_TOKEN</stringvalue>.<paragraphbreak />
+				Actual implementations should create a sub-class and override this
+				function to make the access token values be stored in other types
+				of containers, like for instance databases.</usage>
+			<returnvalue>This function should return
+				<booleanvalue>1</booleanvalue> if the access token was stored
+				successfully.</returnvalue>
+		</documentation>
+		<argument>
+			<name>access_token</name>
+			<type>HASH</type>
+			<documentation>
+				<purpose>Associative array with properties of the access token. 
+					The array may have set the following
+					properties:<paragraphbreak />
+					<stringvalue>value</stringvalue>: string value of the access
+						token<paragraphbreak />
+					<stringvalue>authorized</stringvalue>: boolean value that
+						determines if the access token was obtained
+						successfully<paragraphbreak />
+					<stringvalue>expiry</stringvalue>: (optional) timestamp in ISO
+						format relative to UTC time zone of the access token expiry
+						time<paragraphbreak />
+					<stringvalue>type</stringvalue>: (optional) type of OAuth token
+						that may determine how it should be used when sending API call
+						requests.<paragraphbreak />
+					<stringvalue>refresh</stringvalue>: (optional) token that some
+						servers may set to allowing refreshing access tokens when they
+						expire.</purpose>
+			</documentation>
+		</argument>
+		<do>
+{/metadocument}
+*/
+	Function StoreAccessToken($access_token)
+	{
+		if(!$this->session_started)
+		{
+			if(!function_exists('session_start'))
+				return $this->SetError('Session variables are not accessible in this PHP environment');
+		}
+		$_SESSION['OAUTH_ACCESS_TOKEN'][$this->access_token_url] = $access_token;
+		return true;
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>GetAccessToken</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Retrieve the OAuth access token if it was already
+				previously stored by the
+				<functionlink>StoreAccessToken</functionlink> function.</purpose>
+			<usage>This function is meant to be only be called from inside the
+				class. By default it retrieves access tokens stored in a session
+				variable named
+				<stringvalue>OAUTH_ACCESS_TOKEN</stringvalue>.<paragraphbreak />
+				Actual implementations should create a sub-class and override this
+				function to retrieve the access token values from other types of
+				containers, like for instance databases.</usage>
+			<returnvalue>This function should return
+				<booleanvalue>1</booleanvalue> if the access token was retrieved
+				successfully.</returnvalue>
+		</documentation>
+		<argument>
+			<name>access_token</name>
+			<type>STRING</type>
+			<out />
+			<documentation>
+				<purpose>Return the properties of the access token in an
+					associative array. If the access token was not yet stored, it
+					returns an empty array. Otherwise, the properties it may return
+					are the same that may be passed to the
+					<functionlink>StoreAccessToken</functionlink>.</purpose>
+			</documentation>
+		</argument>
+		<do>
+{/metadocument}
+*/
+	Function GetAccessToken(&$access_token)
+	{
+		if(!$this->session_started)
+		{
+			if(!function_exists('session_start'))
+				return $this->SetError('Session variables are not accessible in this PHP environment');
+			if(!session_start())
+				return($this->SetPHPError('it was not possible to start the PHP session', $php_error_message));
+			$this->session_started = true;
+		}
+		if(IsSet($_SESSION['OAUTH_ACCESS_TOKEN'][$this->access_token_url]))
+			$access_token = $_SESSION['OAUTH_ACCESS_TOKEN'][$this->access_token_url];
+		else
+			$access_token = array();
+		return true;
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>ResetAccessToken</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Reset the access token to a state back when the user has
+				not yet authorized the access to the OAuth server API.</purpose>
+			<usage>Call this function if for some reason the token to access
+				the API was revoked and you need to ask the user to authorize
+				the access again.<paragraphbreak />
+				By default the class stores and retrieves access tokens in a
+				session variable named
+				<stringvalue>OAUTH_ACCESS_TOKEN</stringvalue>.<paragraphbreak />
+				This function must be called when the user is accessing your site
+				pages, so it can reset the information stored in session variables
+				that cache the state of a previously retrieved access
+				token.<paragraphbreak />
+				Actual implementations should create a sub-class and override this
+				function to reset the access token state when it is stored in
+				other types of containers, like for instance databases.</usage>
+			<returnvalue>This function should return
+				<booleanvalue>1</booleanvalue> if the access token was resetted
+				successfully.</returnvalue>
+		</documentation>
+		<do>
+{/metadocument}
+*/
+	Function ResetAccessToken()
+	{
+		if($this->debug)
+			$this->OutputDebug('Resetting the access token status for OAuth server located at '.$this->access_token_url);
+		if(!$this->session_started)
+		{
+			if(!function_exists('session_start'))
+				return $this->SetError('Session variables are not accessible in this PHP environment');
+			if(!session_start())
+				return($this->SetPHPError('it was not possible to start the PHP session', $php_error_message));
+		}
+		$this->session_started = true;
+		if(IsSet($_SESSION['OAUTH_ACCESS_TOKEN'][$this->access_token_url]))
+			Unset($_SESSION['OAUTH_ACCESS_TOKEN'][$this->access_token_url]);
+		return true;
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+	Function Encode($value)
+	{
+		return(is_array($value) ? $this->EncodeArray($value) : str_replace('%7E', '~', str_replace('+',' ', RawURLEncode($value))));
+	}
+
+	Function EncodeArray($array)
+	{
+		foreach($array as $key => $value)
+			$array[$key] = $this->Encode($value);
+		return $array;
+	}
+
+	Function HMAC($function, $data, $key)
+	{
+		switch($function)
+		{
+			case 'sha1':
+				$pack = 'H40';
+				break;
+			default:
+				if($this->debug)
+					$this->OutputDebug($function.' is not a supported an HMAC hash type');
+				return('');
+		}
+		if(strlen($key) > 64)
+			$key = pack($pack, $function($key));
+		if(strlen($key) < 64)
+			$key = str_pad($key, 64, "\0");
+		return(pack($pack, $function((str_repeat("\x5c", 64) ^ $key).pack($pack, $function((str_repeat("\x36", 64) ^ $key).$data)))));
+	}
+
+	Function SendAPIRequest($url, $method, $parameters, $oauth, $options, &$response)
+	{
+		$this->response_status = 0;
+		$http = new http_class;
+		$http->debug = ($this->debug && $this->debug_http);
+		$http->log_debug = true;
+		$http->sasl_authenticate = 0;
+		$http->user_agent = $this->oauth_user_agent;
+		$http->redirection_limit = (IsSet($options['FollowRedirection']) ? intval($options['FollowRedirection']) : 0);
+		$http->follow_redirect = ($http->redirection_limit != 0);
+		if($this->debug)
+			$this->OutputDebug('Accessing the '.$options['Resource'].' at '.$url);
+		$post_files = array();
+		$method = strtoupper($method);
+		$authorization = '';
+		$type = (IsSet($options['RequestContentType']) ? strtolower(trim(strtok($options['RequestContentType'], ';'))) : 'application/x-www-form-urlencoded');
+		if(IsSet($oauth))
+		{
+			$values = array(
+				'oauth_consumer_key'=>$this->client_id,
+				'oauth_nonce'=>md5(uniqid(rand(), true)),
+				'oauth_signature_method'=>$this->signature_method,
+				'oauth_timestamp'=>time(),
+				'oauth_version'=>'1.0',
+			);
+			$files = (IsSet($options['Files']) ? $options['Files'] : array());
+			if(count($files))
+			{
+				foreach($files as $name => $value)
+				{
+					if(!IsSet($parameters[$name]))
+						return($this->SetError('it was specified an file parameters named '.$name));
+					$file = array();
+					switch(IsSet($value['Type']) ? $value['Type'] : 'FileName')
+					{
+						case 'FileName':
+							$file['FileName'] = $parameters[$name];
+							break;
+						case 'Data':
+							$file['Data'] = $parameters[$name];
+							break;
+						default:
+							return($this->SetError($value['Type'].' is not a valid type for file '.$name));
+					}
+					$file['ContentType'] = (IsSet($value['Content-Type']) ? $value['Content-Type'] : 'automatic/name');
+					$post_files[$name] = $file;
+				}
+				UnSet($parameters[$name]);
+				if($method !== 'POST')
+				{
+					$this->OutputDebug('For uploading files the method should be POST not '.$method);
+					$method = 'POST';
+				}
+				if($type !== 'multipart/form-data')
+				{
+					if(IsSet($options['RequestContentType']))
+						return($this->SetError('the request content type for uploading files should be multipart/form-data'));
+					$type = 'multipart/form-data';
+				}
+				$value_parameters = array();
+			}
+			else
+			{
+				if($this->url_parameters
+				&& $type === 'application/x-www-form-urlencoded'
+				&& count($parameters))
+				{
+					$first = (strpos($url, '?') === false);
+					foreach($parameters as $parameter => $value)
+					{
+						$url .= ($first ? '?' : '&').UrlEncode($parameter).'='.UrlEncode($value);
+						$first = false;
+					}
+					$parameters = array();
+				}
+				$value_parameters = ($type !== 'application/x-www-form-urlencoded' ? array() : $parameters);
+			}
+			$values = array_merge($values, $oauth, $value_parameters);
+			$key = $this->Encode($this->client_secret).'&'.$this->Encode($this->access_token_secret);
+			switch($this->signature_method)
+			{
+				case 'PLAINTEXT':
+					$values['oauth_signature'] = $key;
+					break;
+				case 'HMAC-SHA1':
+					$uri = strtok($url, '?');
+					$sign = $method.'&'.$this->Encode($uri).'&';
+					$first = true;
+					$sign_values = $values;
+					$u = parse_url($url);
+					if(IsSet($u['query']))
+					{
+						parse_str($u['query'], $q);
+						foreach($q as $parameter => $value)
+							$sign_values[$parameter] = $value;
+					}
+					KSort($sign_values);
+					foreach($sign_values as $parameter => $value)
+					{
+						$sign .= $this->Encode(($first ? '' : '&').$parameter.'='.$this->Encode($value));
+						$first = false;
+					}
+					$values['oauth_signature'] = base64_encode($this->HMAC('sha1', $sign, $key));
+					break;
+				default:
+					return $this->SetError($this->signature_method.' signature method is not yet supported');
+			}
+			if($this->authorization_header)
+			{
+				$authorization = 'OAuth';
+				$first = true;
+				foreach($values as $parameter => $value)
+				{
+					$authorization .= ($first ? ' ' : ',').$parameter.'="'.$this->Encode($value).'"';
+					$first = false;
+				}
+			}
+			else
+			{
+				if($method === 'GET'
+				|| (IsSet($options['PostValuesInURI'])
+				&& $options['PostValuesInURI']))
+				{
+					$first = (strcspn($url, '?') == strlen($url));
+					foreach($values as $parameter => $value)
+					{
+						$url .= ($first ? '?' : '&').$parameter.'='.$this->Encode($value);
+						$first = false;
+					}
+					$post_values = array();
+				}
+				else
+					$post_values = $values;
+			}
+		}
+		if(strlen($error = $http->GetRequestArguments($url, $arguments)))
+			return($this->SetError('it was not possible to open the '.$options['Resource'].' URL: '.$error));
+		if(strlen($error = $http->Open($arguments)))
+			return($this->SetError('it was not possible to open the '.$options['Resource'].' URL: '.$error));
+		if(count($post_files))
+			$arguments['PostFiles'] = $post_files;
+		$arguments['RequestMethod'] = $method;
+		switch($type)
+		{
+			case 'application/x-www-form-urlencoded':
+			case 'multipart/form-data':
+				if(IsSet($options['RequestBody']))
+					return($this->SetError('the request body is defined automatically from the parameters'));
+				$arguments['PostValues'] = $parameters;
+				break;
+			case 'application/json':
+				$arguments['Headers']['Content-Type'] = $options['RequestContentType'];
+				if(!IsSet($options['RequestBody']))
+				{
+					$arguments['Body'] = json_encode($parameters);
+					break;
+				}
+			default:
+				if(!IsSet($options['RequestBody']))
+					return($this->SetError('it was not specified the body value of the of the API call request'));
+				$arguments['Headers']['Content-Type'] = $options['RequestContentType'];
+				$arguments['Body'] = $options['RequestBody'];
+				break;
+		}
+		$arguments['Headers']['Accept'] = (IsSet($options['Accept']) ? $options['Accept'] : '*/*');
+		if(strlen($authorization))
+			$arguments['Headers']['Authorization'] = $authorization;
+		if(strlen($error = $http->SendRequest($arguments))
+		|| strlen($error = $http->ReadReplyHeaders($headers)))
+		{
+			$http->Close();
+			return($this->SetError('it was not possible to retrieve the '.$options['Resource'].': '.$error));
+		}
+		$error = $http->ReadWholeReplyBody($data);
+		$http->Close();
+		if(strlen($error))
+		{
+			return($this->SetError('it was not possible to access the '.$options['Resource'].': '.$error));
+		}
+		$this->response_status = intval($http->response_status);
+		$content_type = (IsSet($options['ResponseContentType']) ? $options['ResponseContentType'] : (IsSet($headers['content-type']) ? strtolower(trim(strtok($headers['content-type'], ';'))) : 'unspecified'));
+		switch($content_type)
+		{
+			case 'text/javascript':
+			case 'application/json':
+				if(!function_exists('json_decode'))
+					return($this->SetError('the JSON extension is not available in this PHP setup'));
+				$object = json_decode($data);
+				switch(GetType($object))
+				{
+					case 'object':
+						if(!IsSet($options['ConvertObjects'])
+						|| !$options['ConvertObjects'])
+							$response = $object;
+						else
+						{
+							$response = array();
+							foreach($object as $property => $value)
+								$response[$property] = $value;
+						}
+						break;
+					case 'array':
+						$response = $object;
+						break;
+					default:
+						if(!IsSet($object))
+							return($this->SetError('it was not returned a valid JSON definition of the '.$options['Resource'].' values'));
+						$response = $object;
+						break;
+				}
+				break;
+			case 'application/x-www-form-urlencoded':
+			case 'text/plain':
+			case 'text/html':
+				parse_str($data, $response);
+				break;
+			default:
+				$response = $data;
+				break;
+		}
+		if($this->response_status >= 200
+		&& $this->response_status < 300)
+			$this->access_token_error = '';
+		else
+		{
+			$this->access_token_error = 'it was not possible to access the '.$options['Resource'].': it was returned an unexpected response status '.$http->response_status.' Response: '.$data;
+			if($this->debug)
+				$this->OutputDebug('Could not retrieve the OAuth access. Error: '.$this->access_token_error);
+			if(IsSet($options['FailOnAccessError'])
+			&& $options['FailOnAccessError'])
+			{
+				$this->error = $this->access_token_error;
+				return false;
+			}
+		}
+		return true;
+	}
+
+	Function ProcessToken($code, $refresh)
+	{
+		if($refresh)
+		{
+			$values = array(
+				'client_id'=>$this->client_id,
+				'client_secret'=>$this->client_secret,
+				'refresh_token'=>$this->refresh_token,
+				'grant_type'=>'refresh_token'
+			);
+		}
+		else
+		{
+			if(!$this->GetRedirectURI($redirect_uri))
+				return false;
+			$values = array(
+				'code'=>$code,
+				'client_id'=>$this->client_id,
+				'client_secret'=>$this->client_secret,
+				'redirect_uri'=>$redirect_uri,
+				'grant_type'=>'authorization_code'
+			);
+		}
+		if(!$this->GetAccessTokenURL($url))
+			return false;
+		if(!$this->SendAPIRequest($url, 'POST', $values, null, array('Resource'=>'OAuth '.($refresh ? 'refresh' : 'access').' token', 'ConvertObjects'=>true), $response))
+			return false;
+		if(strlen($this->access_token_error))
+		{
+			$this->authorization_error = $this->access_token_error;
+			return true;
+		}
+		if(!IsSet($response['access_token']))
+		{
+			if(IsSet($response['error']))
+			{
+				$this->authorization_error = 'it was not possible to retrieve the access token: it was returned the error: '.$response['error'];
+				return true;
+			}
+			return($this->SetError('OAuth server did not return the access token'));
+		}
+		$access_token = array(
+			'value'=>$this->access_token = $response['access_token'],
+			'authorized'=>true
+		);
+		if($this->debug)
+			$this->OutputDebug('Access token: '.$this->access_token);
+		if(IsSet($response['expires'])
+		|| IsSet($response['expires_in']))
+		{
+			$expires = (IsSet($response['expires']) ? $response['expires'] : $response['expires_in']);
+			if(strval($expires) !== strval(intval($expires))
+			|| $expires <= 0)
+				return($this->SetError('OAuth server did not return a supported type of access token expiry time'));
+			$this->access_token_expiry = gmstrftime('%Y-%m-%d %H:%M:%S', time() + $expires);
+			if($this->debug)
+				$this->OutputDebug('Access token expiry: '.$this->access_token_expiry.' UTC');
+			$access_token['expiry'] = $this->access_token_expiry;
+		}
+		else
+			$this->access_token_expiry = '';
+		if(IsSet($response['token_type']))
+		{
+			$this->access_token_type = $response['token_type'];
+			if($this->debug)
+				$this->OutputDebug('Access token type: '.$this->access_token_type);
+			$access_token['type'] = $this->access_token_type;
+		}
+		else
+			$this->access_token_type = '';
+		if($refresh)
+			$response['refresh_token'] = $this->refresh_token;
+		elseif(IsSet($response['refresh_token']))
+		{
+			$this->refresh_token = $response['refresh_token'];
+			if($this->debug)
+				$this->OutputDebug('Refresh token: '.$this->refresh_token);
+			$access_token['refresh'] = $this->refresh_token;
+		}
+		else
+			$this->refresh_token = '';
+		if(!$this->StoreAccessToken($access_token))
+			return false;
+		return true;
+	}
+
+	Function RetrieveToken(&$valid)
+	{
+		$valid = false;
+		if(!$this->GetAccessToken($access_token))
+			return false;
+		if(IsSet($access_token['value']))
+		{
+			$this->access_token_expiry = '';
+			if(IsSet($access_token['expiry'])
+			&& strcmp($this->access_token_expiry = $access_token['expiry'], gmstrftime('%Y-%m-%d %H:%M:%S')) < 0)
+			{
+				$this->access_token = '';
+				if($this->debug)
+					$this->OutputDebug('The OAuth access token expired in '.$this->access_token_expiry);
+			}
+			else
+			{
+				$this->access_token = $access_token['value'];
+				if(IsSet($access_token['type']))
+					$this->access_token_type = $access_token['type'];
+				else
+					$this->access_token_type = '';
+				if($this->debug)
+					$this->OutputDebug('The OAuth access token '.$this->access_token.' is valid');
+				if(strlen($this->access_token_type)
+				&& $this->debug)
+					$this->OutputDebug('The OAuth access token is of type '.$this->access_token_type);
+				if(IsSet($access_token['refresh']))
+					$this->refresh_token = $access_token['refresh'];
+				else
+					$this->refresh_token = '';
+				$valid = true;
+			}
+		}
+		return true;
+	}
+/*
+{metadocument}
+	<function>
+		<name>CallAPI</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Send a HTTP request to the Web services API using a
+				previously obtained authorization token via OAuth.</purpose>
+			<usage>This function can be used to call an API after having
+				previously obtained an access token through the OAuth protocol
+				using the <functionlink>Process</functionlink> function, or by
+				directly setting the variables
+				<variablelink>access_token</variablelink>, as well as
+				<variablelink>access_token_secret</variablelink> in case of using
+				OAuth 1.0 or 1.0a services.</usage>
+			<returnvalue>This function returns <booleanvalue>1</booleanvalue> if
+				the call was done successfully.</returnvalue>
+		</documentation>
+		<argument>
+			<name>url</name>
+			<type>STRING</type>
+			<documentation>
+				<purpose>URL of the API where the HTTP request will be sent.</purpose>
+			</documentation>
+		</argument>
+		<argument>
+			<name>method</name>
+			<type>STRING</type>
+			<documentation>
+				<purpose>HTTP method that will be used to send the request. It can
+				be <stringvalue>GET</stringvalue>,
+				<stringvalue>POST</stringvalue>,
+				<stringvalue>DELETE</stringvalue>, <stringvalue>PUT</stringvalue>,
+				etc..</purpose>
+			</documentation>
+		</argument>
+		<argument>
+			<name>parameters</name>
+			<type>HASH</type>
+			<documentation>
+				<purpose>Associative array with the names and values of the API
+					call request parameters.</purpose>
+			</documentation>
+		</argument>
+		<argument>
+			<name>options</name>
+			<type>HASH</type>
+			<documentation>
+				<purpose>Associative array with additional options to configure
+					the request. Currently it supports the following
+					options:<paragraphbreak />
+					<stringvalue>2Legged</stringvalue>: boolean option that
+						determines if the API request should be 2 legged. The default
+						value is <tt><booleanvalue>0</booleanvalue></tt>.<paragraphbreak />
+					<stringvalue>Accept</stringvalue>: content type value of the
+						Accept HTTP header to be sent in the API call HTTP request.
+						Some APIs require that a certain value be sent to specify
+						which version of the API is being called. The default value is
+						<stringvalue>*&#47;*</stringvalue>.<paragraphbreak />
+					<stringvalue>ConvertObjects</stringvalue>: boolean option that
+						determines if objects should be converted into arrays when the
+						response is returned in JSON format. The default value is
+						<booleanvalue>0</booleanvalue>.<paragraphbreak />
+					<stringvalue>FailOnAccessError</stringvalue>: boolean option
+						that determines if this functions should fail when the server
+						response status is not between 200 and 299. The default value
+						is <booleanvalue>0</booleanvalue>.<paragraphbreak />
+					<stringvalue>Files</stringvalue>: associative array with
+						details of the parameters that must be passed as file uploads.
+						The array indexes must have the same name of the parameters
+						to be sent as files. The respective array entry values must
+						also be associative arrays with the parameters for each file.
+						Currently it supports the following parameters:<paragraphbreak />
+						- <tt>Type</tt> - defines how the parameter value should be
+						treated. It can be <tt>'FileName'</tt> if the parameter value is
+						is the name of a local file to be uploaded. It may also be
+						<tt>'Data'</tt> if the parameter value is the actual data of
+						the file to be uploaded.<paragraphbreak />
+						- Default: <tt>'FileName'</tt><paragraphbreak />
+						- <tt>ContentType</tt> - MIME value of the content type of the
+						file. It can be <tt>'automatic/name'</tt> if the content type
+						should be determine from the file name extension.<paragraphbreak />
+						- Default: <tt>'automatic/name'</tt><paragraphbreak />
+					<stringvalue>PostValuesInURI</stringvalue>: boolean option to
+						determine that a POST request should pass the request values
+						in the URI. The default value is
+						<booleanvalue>0</booleanvalue>.<paragraphbreak />
+					<stringvalue>FollowRedirection</stringvalue>: limit number of
+						times that HTTP response redirects will be followed. If it is
+						set to <integervalue>0</integervalue>, redirection responses
+						fail in error. The default value is
+						<integervalue>0</integervalue>.<paragraphbreak />
+					<stringvalue>RequestBody</stringvalue>: request body data of a
+						custom type. The <stringvalue>RequestContentType</stringvalue>
+						option must be specified, so the
+						<stringvalue>RequestBody</stringvalue> option is considered.<paragraphbreak />
+					<stringvalue>RequestContentType</stringvalue>: content type that
+						should be used to send the request values. It can be either
+						<stringvalue>application/x-www-form-urlencoded</stringvalue>
+						for sending values like from Web forms, or
+						<stringvalue>application/json</stringvalue> for sending the
+						values encoded in JSON format. Other types are accepted if the
+						<stringvalue>RequestBody</stringvalue> option is specified.
+						The default value is
+						<stringvalue>application/x-www-form-urlencoded</stringvalue>.<paragraphbreak />
+					<stringvalue>RequestBody</stringvalue>: request body data of a
+						custom type. The <stringvalue>RequestContentType</stringvalue>
+						option must be specified, so the
+						<stringvalue>RequestBody</stringvalue> option is considered.<paragraphbreak />
+					<stringvalue>Resource</stringvalue>: string with a label that
+						will be used in the error messages and debug log entries to
+						identify what operation the request is performing. The default
+						value is <stringvalue>API call</stringvalue>.<paragraphbreak />
+					<stringvalue>ResponseContentType</stringvalue>: content type
+						that should be considered when decoding the API request
+						response. This overrides the <tt>Content-Type</tt> header
+						returned by the server. If the content type is 
+						<stringvalue>application/x-www-form-urlencoded</stringvalue>
+						the function will parse the data returning an array of
+						key-value pairs. If the content type is 
+						<stringvalue>application/json</stringvalue> the response will
+						be decode as a JSON-encoded data type. Other content type
+						values will make the function return the original response
+						value as it was returned from the server. The default value
+						for this option is to use what the server returned in the
+						<tt>Content-Type</tt> header.</purpose>
+			</documentation>
+		</argument>
+		<argument>
+			<name>response</name>
+			<type>STRING</type>
+			<out />
+			<documentation>
+				<purpose>Return the value of the API response. If the value is
+					JSON encoded, this function will decode it and return the value
+					converted to respective types. If the value is form encoded,
+					this function will decode the response and return it as an
+					array. Otherwise, the class will return the value as a
+					string.</purpose>
+			</documentation>
+		</argument>
+		<do>
+{/metadocument}
+*/
+	Function CallAPI($url, $method, $parameters, $options, &$response)
+	{
+		if(!IsSet($options['Resource']))
+			$options['Resource'] = 'API call';
+		if(!IsSet($options['ConvertObjects']))
+			$options['ConvertObjects'] = false;
+		if(strlen($this->access_token) === 0)
+		{
+			if(!$this->RetrieveToken($valid))
+				return false;
+			if(!$valid)
+				return $this->SetError('the access token is not set to a valid value');
+		}
+		switch(intval($this->oauth_version))
+		{
+			case 1:
+				$oauth = array(
+					'oauth_token'=>((IsSet($options['2Legged']) && $options['2Legged']) ? '' : $this->access_token)
+				);
+				break;
+
+			case 2:
+				if(strlen($this->access_token_expiry)
+				&& strcmp($this->access_token_expiry, gmstrftime('%Y-%m-%d %H:%M:%S')) <= 0)
+				{
+					if(strlen($this->refresh_token) === 0)
+						return($this->SetError('the access token expired and no refresh token is available'));
+					if($this->debug)
+					{
+						$this->OutputDebug('The access token expired on '.$this->access_token_expiry);
+						$this->OutputDebug('Refreshing the access token');
+					}
+					if(!$this->ProcessToken(null, true))
+						return false;
+				}
+				$oauth = null;
+				$url .= (strcspn($url, '?') < strlen($url) ? '&' : '?').'access_token='.UrlEncode($this->access_token);
+				break;
+
+			default:
+				return($this->SetError($this->oauth_version.' is not a supported version of the OAuth protocol'));
+		}
+		return($this->SendAPIRequest($url, $method, $parameters, $oauth, $options, $response));
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>Initialize</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Initialize the class variables and internal state. It must
+				be called before calling other class functions.</purpose>
+			<usage>Set the <variablelink>server</variablelink> variable before
+				calling this function to let it initialize the class variables to
+				work with the specified server type. Alternatively, you can set
+				other class variables manually to make it work with servers that
+				are not yet built-in supported.</usage>
+			<returnvalue>This function returns <booleanvalue>1</booleanvalue> if
+				it was able to successfully initialize the class for the specified
+				server type.</returnvalue>
+		</documentation>
+		<do>
+{/metadocument}
+*/
+	Function Initialize()
+	{
+		if(strlen($this->server) === 0)
+			return true;
+		$this->request_token_url = '';
+		$this->append_state_to_redirect_uri = '';
+		$this->authorization_header = true;
+		$this->url_parameters = false;
+		$this->token_request_method = 'GET';
+		$this->signature_method = 'HMAC-SHA1';
+		switch($this->server)
+		{
+			case 'Bitbucket':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://bitbucket.org/!api/1.0/oauth/request_token';
+				$this->dialog_url = 'https://bitbucket.org/!api/1.0/oauth/authenticate';
+				$this->access_token_url = 'https://bitbucket.org/!api/1.0/oauth/access_token';
+				$this->url_parameters = true;
+				break;
+
+			case 'Box':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://www.box.com/api/oauth2/authorize?response_type=code&client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&state={STATE}';
+				$this->offline_dialog_url = 'https://www.box.com/api/oauth2/authorize?response_type=code&client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&state={STATE}&access_type=offline&approval_prompt=force';
+				$this->access_token_url = 'https://www.box.com/api/oauth2/token';
+				break;
+
+			case 'Dropbox':
+				$this->oauth_version = '1.0';
+				$this->request_token_url = 'https://api.dropbox.com/1/oauth/request_token';
+				$this->dialog_url = 'https://www.dropbox.com/1/oauth/authorize';
+				$this->access_token_url = 'https://api.dropbox.com/1/oauth/access_token';
+				$this->authorization_header = false;
+				break;
+
+			case 'Eventful':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'http://eventful.com/oauth/request_token';
+				$this->dialog_url = 'http://eventful.com/oauth/authorize';
+				$this->access_token_url = 'http://eventful.com/oauth/access_token';
+				$this->authorization_header = false;
+				$this->url_parameters = true;
+				$this->token_request_method = 'POST';
+				break;
+
+			case 'Evernote':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://sandbox.evernote.com/oauth';
+				$this->dialog_url = 'https://sandbox.evernote.com/OAuth.action';
+				$this->access_token_url = 'https://sandbox.evernote.com/oauth';
+				$this->url_parameters = true;
+				$this->authorization_header = false;
+				break;
+
+			case 'Facebook':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://www.facebook.com/dialog/oauth?client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&scope={SCOPE}&state={STATE}';
+				$this->access_token_url = 'https://graph.facebook.com/oauth/access_token';
+				break;
+
+			case 'Fitbit':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'http://api.fitbit.com/oauth/request_token';
+				$this->dialog_url = 'http://api.fitbit.com/oauth/authorize';
+				$this->access_token_url = 'http://api.fitbit.com/oauth/access_token';
+				break;
+
+			case 'Flickr':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'http://www.flickr.com/services/oauth/request_token';
+				$this->dialog_url = 'http://www.flickr.com/services/oauth/authorize?perms={SCOPE}';
+				$this->access_token_url = 'http://www.flickr.com/services/oauth/access_token';
+				$this->authorization_header = false;
+				break;
+
+			case 'Foursquare':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://foursquare.com/oauth2/authorize?client_id={CLIENT_ID}&scope={SCOPE}&response_type=code&redirect_uri={REDIRECT_URI}&state={STATE}';
+				$this->access_token_url = 'https://foursquare.com/oauth2/access_token';
+				break;
+
+			case 'github':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://github.com/login/oauth/authorize?client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&scope={SCOPE}&state={STATE}';
+				$this->access_token_url = 'https://github.com/login/oauth/access_token';
+				break;
+
+			case 'Google':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&scope={SCOPE}&state={STATE}';
+				$this->offline_dialog_url = 'https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&scope={SCOPE}&state={STATE}&access_type=offline&approval_prompt=force';
+				$this->access_token_url = 'https://accounts.google.com/o/oauth2/token';
+				break;
+
+			case 'Instagram':
+				$this->oauth_version = '2.0';
+				$this->dialog_url ='https://api.instagram.com/oauth/authorize/?client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}&scope={SCOPE}&response_type=code&state={STATE}';
+				$this->access_token_url = 'https://api.instagram.com/oauth/access_token';
+				break;
+
+			case 'LinkedIn':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://api.linkedin.com/uas/oauth/requestToken?scope={SCOPE}';
+				$this->dialog_url = 'https://api.linkedin.com/uas/oauth/authenticate';
+				$this->access_token_url = 'https://api.linkedin.com/uas/oauth/accessToken';
+				$this->url_parameters = true;
+				break;
+
+			case 'Microsoft':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://login.live.com/oauth20_authorize.srf?client_id={CLIENT_ID}&scope={SCOPE}&response_type=code&redirect_uri={REDIRECT_URI}&state={STATE}';
+				$this->access_token_url = 'https://login.live.com/oauth20_token.srf';
+				break;
+
+			case 'RightSignature':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://rightsignature.com/oauth/request_token';
+				$this->dialog_url = 'https://rightsignature.com/oauth/authorize';
+				$this->access_token_url = 'https://rightsignature.com/oauth/access_token';
+				$this->authorization_header = false;
+				break;
+
+			case 'Scoop.it':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://www.scoop.it/oauth/request';
+				$this->dialog_url = 'https://www.scoop.it/oauth/authorize';
+				$this->access_token_url = 'https://www.scoop.it/oauth/access';
+				$this->authorization_header = false;
+				break;
+
+			case 'StockTwits':
+				$this->oauth_version = '2.0';
+				$this->dialog_url = 'https://api.stocktwits.com/api/2/oauth/authorize?client_id={CLIENT_ID}&response_type=code&redirect_uri={REDIRECT_URI}&scope={SCOPE}&state={STATE}';
+				$this->access_token_url = 'https://api.stocktwits.com/api/2/oauth/token';
+				break;
+
+			case 'Tumblr':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'http://www.tumblr.com/oauth/request_token';
+				$this->dialog_url = 'http://www.tumblr.com/oauth/authorize';
+				$this->access_token_url = 'http://www.tumblr.com/oauth/access_token';
+				break;
+
+			case 'Twitter':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://api.twitter.com/oauth/request_token';
+				$this->dialog_url = 'https://api.twitter.com/oauth/authenticate';
+				$this->access_token_url = 'https://api.twitter.com/oauth/access_token';
+				$this->url_parameters = true;
+				break;
+
+			case 'XING':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://api.xing.com/v1/request_token';
+				$this->dialog_url = 'https://api.xing.com/v1/authorize';
+				$this->access_token_url = 'https://api.xing.com/v1/access_token';
+				$this->authorization_header = false;
+				break;
+
+			case 'Yahoo':
+				$this->oauth_version = '1.0a';
+				$this->request_token_url = 'https://api.login.yahoo.com/oauth/v2/get_request_token';
+				$this->dialog_url = 'https://api.login.yahoo.com/oauth/v2/request_auth';
+				$this->access_token_url = 'https://api.login.yahoo.com/oauth/v2/get_token';
+				$this->authorization_header = false;
+				break;
+
+			default:
+				return($this->SetError($this->server.' is not yet a supported type of OAuth server. Please contact the author Manuel Lemos <mlemos@acm.org> to request adding built-in support to this type of OAuth server.'));
+		}
+		return(true);
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>Process</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Process the OAuth protocol interaction with the OAuth
+				server.</purpose>
+			<usage>Call this function when you need to retrieve the OAuth access
+				token. Check the <variablelink>access_token</variablelink> to
+				determine if the access token was obtained successfully.</usage>
+			<returnvalue>This function returns <booleanvalue>1</booleanvalue> if
+				the OAuth protocol was processed without errors.</returnvalue>
+		</documentation>
+		<do>
+{/metadocument}
+*/
+	Function Process()
+	{
+		switch(intval($this->oauth_version))
+		{
+			case 1:
+				$one_a = ($this->oauth_version === '1.0a');
+				if($this->debug)
+					$this->OutputDebug('Checking the OAuth token authorization state');
+				if(!$this->GetAccessToken($access_token))
+					return false;
+				if(IsSet($access_token['authorized'])
+				&& IsSet($access_token['value']))
+				{
+					$expired = (IsSet($access_token['expiry']) && strcmp($access_token['expiry'], gmstrftime('%Y-%m-%d %H:%M:%S')) <= 0);
+					if(!$access_token['authorized']
+					|| $expired)
+					{
+						if($this->debug)
+						{
+							if($expired)
+								$this->OutputDebug('The OAuth token expired on '.$access_token['expiry'].'UTC');
+							else
+								$this->OutputDebug('The OAuth token is not yet authorized');
+							$this->OutputDebug('Checking the OAuth token and verifier');
+						}
+						if(!$this->GetRequestToken($token, $verifier))
+							return false;
+						if(!IsSet($token)
+						|| ($one_a
+						&& !IsSet($verifier)))
+						{
+							if(!$this->GetRequestDenied($denied))
+								return false;
+							if(IsSet($denied)
+							&& $denied === $access_token['value'])
+							{
+								if($this->debug)
+									$this->OutputDebug('The authorization request was denied');
+								$this->authorization_error = 'the request was denied';
+								return true;
+							}
+							else
+							{
+								if($this->debug)
+									$this->OutputDebug('Reset the OAuth token state because token and verifier are not both set');
+								$access_token = array();
+							}
+						}
+						elseif($token !== $access_token['value'])
+						{
+							if($this->debug)
+								$this->OutputDebug('Reset the OAuth token state because token does not match what as previously retrieved');
+							$access_token = array();
+						}
+						else
+						{
+							if(!$this->GetAccessTokenURL($url))
+								return false;
+							$oauth = array(
+								'oauth_token'=>$token,
+							);
+							if($one_a)
+								$oauth['oauth_verifier'] = $verifier;
+							$this->access_token_secret = $access_token['secret'];
+							$options = array('Resource'=>'OAuth access token');
+							$method = strtoupper($this->token_request_method);
+							switch($method)
+							{
+								case 'GET':
+									break;
+								case 'POST':
+									$options['PostValuesInURI'] = true;
+									break;
+								default:
+									$this->error = $method.' is not a supported method to request tokens';
+									break;
+							}
+							if(!$this->SendAPIRequest($url, $method, array(), $oauth, $options, $response))
+								return false;
+							if(strlen($this->access_token_error))
+							{
+								$this->authorization_error = $this->access_token_error;
+								return true;
+							}
+							if(!IsSet($response['oauth_token'])
+							|| !IsSet($response['oauth_token_secret']))
+							{
+								$this->authorization_error= 'it was not returned the access token and secret';
+								return true;
+							}
+							$access_token = array(
+								'value'=>$response['oauth_token'],
+								'secret'=>$response['oauth_token_secret'],
+								'authorized'=>true
+							);
+							if(IsSet($response['oauth_expires_in']))
+							{
+								$expires = $response['oauth_expires_in'];
+								if(strval($expires) !== strval(intval($expires))
+								|| $expires <= 0)
+									return($this->SetError('OAuth server did not return a supported type of access token expiry time'));
+								$this->access_token_expiry = gmstrftime('%Y-%m-%d %H:%M:%S', time() + $expires);
+								if($this->debug)
+									$this->OutputDebug('Access token expiry: '.$this->access_token_expiry.' UTC');
+								$access_token['expiry'] = $this->access_token_expiry;
+							}
+							else
+								$this->access_token_expiry = '';
+
+							if(!$this->StoreAccessToken($access_token))
+								return false;
+							if($this->debug)
+								$this->OutputDebug('The OAuth token was authorized');
+						}
+					}
+					elseif($this->debug)
+						$this->OutputDebug('The OAuth token was already authorized');
+					if(IsSet($access_token['authorized'])
+					&& $access_token['authorized'])
+					{
+						$this->access_token = $access_token['value'];
+						$this->access_token_secret = $access_token['secret'];
+						return true;
+					}
+				}
+				else
+				{
+					if($this->debug)
+						$this->OutputDebug('The OAuth access token is not set');
+					$access_token = array();
+				}
+				if(!IsSet($access_token['authorized']))
+				{
+					if($this->debug)
+						$this->OutputDebug('Requesting the unauthorized OAuth token');
+					if(!$this->GetRequestTokenURL($url))
+						return false;
+					$url = str_replace('{SCOPE}', UrlEncode($this->scope), $url); 
+					if(!$this->GetRedirectURI($redirect_uri))
+						return false;
+					$oauth = array(
+						'oauth_callback'=>$redirect_uri,
+					);
+					$options = array('Resource'=>'OAuth request token');
+					$method = strtoupper($this->token_request_method);
+					switch($method)
+					{
+						case 'GET':
+							break;
+						case 'POST':
+							$options['PostValuesInURI'] = true;
+							break;
+						default:
+							$this->error = $method.' is not a supported method to request tokens';
+							break;
+					}
+					if(!$this->SendAPIRequest($url, $method, array(), $oauth, $options, $response))
+						return false;
+					if(strlen($this->access_token_error))
+					{
+						$this->authorization_error = $this->access_token_error;
+						return true;
+					}
+					if(!IsSet($response['oauth_token'])
+					|| !IsSet($response['oauth_token_secret']))
+					{
+						$this->authorization_error = 'it was not returned the requested token';
+						return true;
+					}
+					$access_token = array(
+						'value'=>$response['oauth_token'],
+						'secret'=>$response['oauth_token_secret'],
+						'authorized'=>false
+					);
+					if(!$this->StoreAccessToken($access_token))
+						return false;
+				}
+				if(!$this->GetDialogURL($url))
+					return false;
+				$url .= (strpos($url, '?') === false ? '?' : '&').'oauth_token='.$access_token['value'];
+				if(!$one_a)
+				{
+					if(!$this->GetRedirectURI($redirect_uri))
+						return false;
+					$url .= '&oauth_callback='.UrlEncode($redirect_uri);
+				}
+				if($this->debug)
+					$this->OutputDebug('Redirecting to OAuth authorize page '.$url);
+				Header('HTTP/1.0 302 OAuth Redirection');
+				Header('Location: '.$url);
+				$this->exit = true;
+				return true;
+
+			case 2:
+				if($this->debug)
+					$this->OutputDebug('Checking if OAuth access token was already retrieved from '.$this->access_token_url);
+				if(!$this->RetrieveToken($valid))
+					return false;
+				if($valid)
+					return true;
+				if($this->debug)
+					$this->OutputDebug('Checking the authentication state in URI '.$_SERVER['REQUEST_URI']);
+				if(!$this->GetStoredState($stored_state))
+					return false;
+				if(strlen($stored_state) == 0)
+					return($this->SetError('it was not set the OAuth state'));
+				if(!$this->GetRequestState($state))
+					return false;
+				if($state === $stored_state)
+				{
+					if($this->debug)
+						$this->OutputDebug('Checking the authentication code');
+					if(!$this->GetRequestCode($code))
+						return false;
+					if(strlen($code) == 0)
+					{
+						if(!$this->GetRequestError($this->authorization_error))
+							return false;
+						if(IsSet($this->authorization_error))
+						{
+							if($this->debug)
+								$this->OutputDebug('Authorization failed with error code '.$this->authorization_error);
+							switch($this->authorization_error)
+							{
+								case 'invalid_request':
+								case 'unauthorized_client':
+								case 'access_denied':
+								case 'unsupported_response_type':
+								case 'invalid_scope':
+								case 'server_error':
+								case 'temporarily_unavailable':
+								case 'user_denied':
+									return true;
+								default:
+									return($this->SetError('it was returned an unknown OAuth error code'));
+							}
+						}
+						return($this->SetError('it was not returned the OAuth dialog code'));
+					}
+					if(!$this->ProcessToken($code, false))
+						return false;
+				}
+				else
+				{
+					if(!$this->GetRedirectURI($redirect_uri))
+						return false;
+					if(strlen($this->append_state_to_redirect_uri))
+						$redirect_uri .= (strpos($redirect_uri, '?') === false ? '?' : '&').$this->append_state_to_redirect_uri.'='.$stored_state;
+					if(!$this->GetDialogURL($url, $redirect_uri, $stored_state))
+						return false;
+					if(strlen($url) == 0)
+						return($this->SetError('it was not set the OAuth dialog URL'));
+					if($this->debug)
+						$this->OutputDebug('Redirecting to OAuth Dialog '.$url);
+					Header('HTTP/1.0 302 OAuth Redirection');
+					Header('Location: '.$url);
+					$this->exit = true;
+				}
+				break;
+
+			default:
+				return($this->SetError($this->oauth_version.' is not a supported version of the OAuth protocol'));
+		}
+		return(true);
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>Finalize</name>
+		<type>BOOLEAN</type>
+		<documentation>
+			<purpose>Cleanup any resources that may have been used during the
+				OAuth protocol processing or execution of API calls.</purpose>
+			<usage>Always call this function as the last step after calling the
+				functions <functionlink>Process</functionlink> or
+				<functionlink>CallAPI</functionlink>.</usage>
+			<returnvalue>This function returns <booleanvalue>1</booleanvalue> if
+				the function cleaned up any resources successfully.</returnvalue>
+		</documentation>
+		<argument>
+			<name>success</name>
+			<type>BOOLEAN</type>
+			<documentation>
+				<purpose>Pass the last success state returned by the class or any
+					external code processing the class function results.</purpose>
+			</documentation>
+		</argument>
+		<do>
+{/metadocument}
+*/
+	Function Finalize($success)
+	{
+		return($success);
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+/*
+{metadocument}
+	<function>
+		<name>Output</name>
+		<type>VOID</type>
+		<documentation>
+			<purpose>Display the results of the OAuth protocol processing.</purpose>
+			<usage>Only call this function if you are debugging the OAuth
+				authorization process and you need to view what was its
+				results.</usage>
+		</documentation>
+		<do>
+{/metadocument}
+*/
+	Function Output()
+	{
+		if(strlen($this->authorization_error)
+		|| strlen($this->access_token_error)
+		|| strlen($this->access_token))
+		{
+?>
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+<head>
+<title>OAuth client result</title>
+</head>
+<body>
+<h1>OAuth client result</h1>
+<?php
+			if(strlen($this->authorization_error))
+			{
+?>
+<p>It was not possible to authorize the application.<?php
+				if($this->debug)
+				{
+?>
+<br>Authorization error: <?php echo HtmlSpecialChars($this->authorization_error);
+				}
+?></p>
+<?php
+			}
+			elseif(strlen($this->access_token_error))
+			{
+?>
+<p>It was not possible to use the application access token.
+<?php
+				if($this->debug)
+				{
+?>
+<br>Error: <?php echo HtmlSpecialChars($this->access_token_error);
+				}
+?></p>
+<?php
+			}
+			elseif(strlen($this->access_token))
+			{
+?>
+<p>The application authorization was obtained successfully.
+<?php
+				if($this->debug)
+				{
+?>
+<br>Access token: <?php echo HtmlSpecialChars($this->access_token);
+					if(IsSet($this->access_token_secret))
+					{
+?>
+<br>Access token secret: <?php echo HtmlSpecialChars($this->access_token_secret);
+					}
+				}
+?></p>
+<?php
+				if(strlen($this->access_token_expiry))
+				{
+?>
+<p>Access token expiry: <?php echo $this->access_token_expiry; ?> UTC</p>
+<?php
+				}
+			}
+?>
+</body>
+</html>
+<?php
+		}
+	}
+/*
+{metadocument}
+		</do>
+	</function>
+{/metadocument}
+*/
+
+};
+
+/*
+
+{metadocument}
+</class>
+{/metadocument}
+
+*/
+
+?>
\ No newline at end of file