<?php
// vim: foldmethod=marker
/* Generic exception class
*/
if (!class_exists('OAuthException')) {
	class OAuthException extends Exception
	{
		// pass
	}
}
class OAuthConsumer
{
    public $key;
    public $secret;
    public function __construct($key, $secret, $callback_url = NULL)
    {
        $this->key = $key;
        $this->secret = $secret;
        $this->callback_url = $callback_url;
    }
    public function __toString()
    {
        return "OAuthConsumer[key=$this->key,secret=$this->secret]";
    }
}
class OAuthToken
{
    // access tokens and request tokens
    public $key;
    public $secret;
    /**
     * key = the token
     * secret = the token secret
     */
    public function __construct($key, $secret)
    {
        $this->key = $key;
        $this->secret = $secret;
    }
    /**
     * generates the basic string serialization of a token that a server
     * would respond to request_token and access_token calls with
     */
    public function to_string()
    {
        return "oauth_token=" . OAuthUtil::urlencode_rfc3986($this->key) . "&oauth_token_secret=" . OAuthUtil::urlencode_rfc3986($this->secret);
    }
    public function __toString()
    {
        return $this->to_string();
    }
}
class OAuthSignatureMethod
{
    public function check_signature(&$request, $consumer, $token, $signature)
    {
        $built = $this->build_signature($request, $consumer, $token);
        return $built == $signature;
    }
}
class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod
{
    public function get_name()
    {
        return "HMAC-SHA1";
    }
    public function build_signature($request, $consumer, $token)
    {
        $base_string = $request->get_signature_base_string();
        $request->base_string = $base_string;
        $key_parts = array(
            $consumer->secret,
            ($token) ? $token->secret : ""
        );
        $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
        $key = implode('&', $key_parts);
        return base64_encode(hash_hmac('sha1', $base_string, $key, true));
    }
}
class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod
{
    public function get_name()
    {
        return "PLAINTEXT";
    }
    public function build_signature($request, $consumer, $token)
    {
        $sig = array(
            OAuthUtil::urlencode_rfc3986($consumer->secret)
        );
        if ($token) {
            array_push($sig, OAuthUtil::urlencode_rfc3986($token->secret));
        } else {
            array_push($sig, '');
        }
        $raw = implode("&", $sig);
        // for debug purposes
        $request->base_string = $raw;
        return OAuthUtil::urlencode_rfc3986($raw);
    }
}
class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod
{
    public function get_name()
    {
        return "RSA-SHA1";
    }
    protected function fetch_public_cert(&$request)
    {
        // not implemented yet, ideas are:
        // (1) do a lookup in a table of trusted certs keyed off of consumer
        // (2) fetch via http using a url provided by the requester
        // (3) some sort of specific discovery code based on request
        //
        // either way should return a string representation of the certificate
        throw Exception("fetch_public_cert not implemented");
    }
    protected function fetch_private_cert(&$request)
    {
        // not implemented yet, ideas are:
        // (1) do a lookup in a table of trusted certs keyed off of consumer
        //
        // either way should return a string representation of the certificate
        throw Exception("fetch_private_cert not implemented");
    }
    public function build_signature(&$request, $consumer, $token)
    {
        $base_string = $request->get_signature_base_string();
        $request->base_string = $base_string;
        // Fetch the private key cert based on the request
        $cert = $this->fetch_private_cert($request);
        // Pull the private key ID from the certificate
        $privatekeyid = openssl_get_privatekey($cert);
        // Sign using the key
        $ok = openssl_sign($base_string, $signature, $privatekeyid);
        // Release the key resource
        openssl_free_key($privatekeyid);
        return base64_encode($signature);
    }
    public function check_signature(&$request, $consumer, $token, $signature)
    {
        $decoded_sig = base64_decode($signature);
        $base_string = $request->get_signature_base_string();
        // Fetch the public key cert based on the request
        $cert = $this->fetch_public_cert($request);
        // Pull the public key ID from the certificate
        $publickeyid = openssl_get_publickey($cert);
        // Check the computed signature against the one passed in the query
        $ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
        // Release the key resource
        openssl_free_key($publickeyid);
        return $ok == 1;
    }
}
class OAuthRequest
{
    private $parameters;
    private $http_method;
    private $http_url;
    // for debug purposes
    public $base_string;
    public static $version = '1.0';
    public static $POST_INPUT = 'php://input';
    public function __construct($http_method, $http_url, $parameters = NULL)
    {
        @$parameters or $parameters = array();
        $this->parameters = $parameters;
        $this->http_method = $http_method;
        $this->http_url = $http_url;
    }
    /**
     * attempt to build up a request from what was passed to the server
     */
    public static function from_request($http_method = NULL, $http_url = NULL, $parameters = NULL)
    {
        $scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on") ? 'http' : 'https';
        @$http_url or $http_url = $scheme . '://' . $_SERVER['HTTP_HOST'] . ':' . $_SERVER['SERVER_PORT'] . $_SERVER['REQUEST_URI'];
        @$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
        // We weren't handed any parameters, so let's find the ones relevant to
        // this request.
        // If you run XML-RPC or similar you should use this to provide your own
        // parsed parameter-list
        if (!$parameters) {
            // Find request headers
            $request_headers = OAuthUtil::get_headers();
            // Parse the query-string to find GET parameters
            $parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
            // It's a POST request of the proper content-type, so parse POST
            // parameters and add those overriding any duplicates from GET
            if ($http_method == "POST" && @strstr($request_headers["Content-Type"], "application/x-www-form-urlencoded")) {
                $post_data = OAuthUtil::parse_parameters(file_get_contents(self::$POST_INPUT));
                $parameters = array_merge($parameters, $post_data);
            }
            // We have a Authorization-header with OAuth data. Parse the header
            // and add those overriding any duplicates from GET or POST
            if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
                $header_parameters = OAuthUtil::split_header($request_headers['Authorization']);
                $parameters = array_merge($parameters, $header_parameters);
            }
        }
        return new OAuthRequest($http_method, $http_url, $parameters);
    }
    /**
     * pretty much a helper public function to set up the request
     */
    public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters = NULL)
    {
        @$parameters or $parameters = array();
        $defaults = array(
            "oauth_version" => OAuthRequest::$version,
            "oauth_nonce" => OAuthRequest::generate_nonce() ,
            "oauth_timestamp" => OAuthRequest::generate_timestamp() ,
            "oauth_consumer_key" => $consumer->key
        );
        if ($token) $defaults['oauth_token'] = $token->key;
        $parameters = array_merge($defaults, $parameters);
        return new OAuthRequest($http_method, $http_url, $parameters);
    }
    public function set_parameter($name, $value, $allow_duplicates = true)
    {
        if ($allow_duplicates && isset($this->parameters[$name])) {
            // We have already added parameter(s) with this name, so add to the list
            if (is_scalar($this->parameters[$name])) {
                // This is the first duplicate, so transform scalar (string)
                // into an array so we can add the duplicates
                $this->parameters[$name] = array(
                    $this->parameters[$name]
                );
            }
            $this->parameters[$name][] = $value;
        } else {
            $this->parameters[$name] = $value;
        }
    }
    public function get_parameter($name)
    {
        return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
    }
    public function get_parameters()
    {
        return $this->parameters;
    }
    public function unset_parameter($name)
    {
        unset($this->parameters[$name]);
    }
    /**
     * The request parameters, sorted and concatenated into a normalized string.
     * @return string
     */
    public function get_signable_parameters()
    {
        // Grab all parameters
        $params = $this->parameters;
        // Remove oauth_signature if present
        // Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
        if (isset($params['oauth_signature'])) {
            unset($params['oauth_signature']);
        }
        return OAuthUtil::build_http_query($params);
    }
    /**
     * Returns the base string of this request
     *
     * The base string defined as the method, the url
     * and the parameters (normalized), each urlencoded
     * and the concated with &.
     */
    public function get_signature_base_string()
    {
        $parts = array(
            $this->get_normalized_http_method() ,
            $this->get_normalized_http_url() ,
            $this->get_signable_parameters()
        );
        $parts = OAuthUtil::urlencode_rfc3986($parts);
        return implode('&', $parts);
    }
    /**
     * just uppercases the http method
     */
    public function get_normalized_http_method()
    {
        return strtoupper($this->http_method);
    }
    /**
     * parses the url and rebuilds it to be
     * scheme://host/path
     */
    public function get_normalized_http_url()
    {
        $parts = parse_url($this->http_url);
        $port = @$parts['port'];
        $scheme = $parts['scheme'];
        $host = $parts['host'];
        $path = @$parts['path'];
        $port or $port = ($scheme == 'https') ? '443' : '80';
        if (($scheme == 'https' && $port != '443') || ($scheme == 'http' && $port != '80')) {
            $host = "$host:$port";
        }
        return "$scheme://$host$path";
    }
    /**
     * builds a url usable for a GET request
     */
    public function to_url()
    {
        $post_data = $this->to_postdata();
        $out = $this->get_normalized_http_url();
        if ($post_data) {
            $out.= '?' . $post_data;
        }
        return $out;
    }
    /**
     * builds the data one would send in a POST request
     */
    public function to_postdata()
    {
        return OAuthUtil::build_http_query($this->parameters);
    }
    /**
     * builds the Authorization: header
     */
    public function to_header()
    {
        $out = 'Authorization: OAuth realm=""';
        $total = array();
        foreach($this->parameters as $k => $v) {
            if (substr($k, 0, 5) != "oauth") continue;
            if (is_array($v)) {
                throw new OAuthException('Arrays not supported in headers');
            }
            $out.= ',' . OAuthUtil::urlencode_rfc3986($k) . '="' . OAuthUtil::urlencode_rfc3986($v) . '"';
        }
        return $out;
    }
    public function __toString()
    {
        return $this->to_url();
    }
    public function sign_request($signature_method, $consumer, $token)
    {
        $this->set_parameter("oauth_signature_method", $signature_method->get_name() , false);
        $signature = $this->build_signature($signature_method, $consumer, $token);
        $this->set_parameter("oauth_signature", $signature, false);
    }
    public function build_signature($signature_method, $consumer, $token)
    {
        $signature = $signature_method->build_signature($this, $consumer, $token);
        return $signature;
    }
    /**
     * util function: current timestamp
     */
    private static function generate_timestamp()
    {
        return time();
    }
    /**
     * util function: current nonce
     */
    private static function generate_nonce()
    {
        $mt = microtime();
        $rand = mt_rand();
        return md5($mt . $rand); // md5s look nicer than numbers

    }
}
class OAuthServer
{
    protected $timestamp_threshold = 300; // in seconds, five minutes
    protected $version = 1.0; // hi blaine
    protected $signature_methods = array();
    protected $data_store;
    public function __construct($data_store)
    {
        $this->data_store = $data_store;
    }
    public function add_signature_method($signature_method)
    {
        $this->signature_methods[$signature_method->get_name() ] = $signature_method;
    }
    // high level functions

    /**
     * process a request_token request
     * returns the request token on success
     */
    public function fetch_request_token(&$request)
    {
        $this->get_version($request);
        $consumer = $this->get_consumer($request);
        // no token required for the initial token request
        $token = NULL;
        $this->check_signature($request, $consumer, $token);
        $new_token = $this->data_store->new_request_token($consumer);
        return $new_token;
    }
    /**
     * process an access_token request
     * returns the access token on success
     */
    public function fetch_access_token(&$request)
    {
        $this->get_version($request);
        $consumer = $this->get_consumer($request);
        // requires authorized request token
        $token = $this->get_token($request, $consumer, "request");
        $this->check_signature($request, $consumer, $token);
        $new_token = $this->data_store->new_access_token($token, $consumer);
        return $new_token;
    }
    /**
     * verify an api call, checks all the parameters
     */
    public function verify_request(&$request)
    {
        $this->get_version($request);
        $consumer = $this->get_consumer($request);
        $token = $this->get_token($request, $consumer, "access");
        $this->check_signature($request, $consumer, $token);
        return array(
            $consumer,
            $token
        );
    }
    // Internals from here

    /**
     * version 1
     */
    private function get_version(&$request)
    {
        $version = $request->get_parameter("oauth_version");
        if (!$version) {
            $version = 1.0;
        }
        if ($version && $version != $this->version) {
            throw new OAuthException("OAuth version '$version' not supported");
        }
        return $version;
    }
    /**
     * figure out the signature with some defaults
     */
    private function get_signature_method(&$request)
    {
        $signature_method = @$request->get_parameter("oauth_signature_method");
        if (!$signature_method) {
            $signature_method = "PLAINTEXT";
        }
        if (!in_array($signature_method, array_keys($this->signature_methods))) {
            throw new OAuthException("Signature method '$signature_method' not supported " . "try one of the following: " . implode(", ", array_keys($this->signature_methods)));
        }
        return $this->signature_methods[$signature_method];
    }
    /**
     * try to find the consumer for the provided request's consumer key
     */
    private function get_consumer(&$request)
    {
        $consumer_key = @$request->get_parameter("oauth_consumer_key");
        if (!$consumer_key) {
            throw new OAuthException("Invalid consumer key");
        }
        $consumer = $this->data_store->lookup_consumer($consumer_key);
        if (!$consumer) {
            throw new OAuthException("Invalid consumer");
        }
        return $consumer;
    }
    /**
     * try to find the token for the provided request's token key
     */
    private function get_token(&$request, $consumer, $token_type = "access")
    {
        $token_field = @$request->get_parameter('oauth_token');
        $token = $this->data_store->lookup_token($consumer, $token_type, $token_field);
        if (!$token) {
            throw new OAuthException("Invalid $token_type token: $token_field");
        }
        return $token;
    }
    /**
     * all-in-one public function to check the signature on a request
     * should guess the signature method appropriately
     */
    private function check_signature(&$request, $consumer, $token)
    {
        // this should probably be in a different method
        $timestamp = @$request->get_parameter('oauth_timestamp');
        $nonce = @$request->get_parameter('oauth_nonce');
        $this->check_timestamp($timestamp);
        $this->check_nonce($consumer, $token, $nonce, $timestamp);
        $signature_method = $this->get_signature_method($request);
        $signature = $request->get_parameter('oauth_signature');
        $valid_sig = $signature_method->check_signature($request, $consumer, $token, $signature);
        if (!$valid_sig) {
            throw new OAuthException("Invalid signature");
        }
    }
    /**
     * check that the timestamp is new enough
     */
    private function check_timestamp($timestamp)
    {
        // verify that timestamp is recentish
        $now = time();
        if ($now-$timestamp > $this->timestamp_threshold) {
            throw new OAuthException("Expired timestamp, yours $timestamp, ours $now");
        }
    }
    /**
     * check that the nonce is not repeated
     */
    private function check_nonce($consumer, $token, $nonce, $timestamp)
    {
        // verify that the nonce is uniqueish
        $found = $this->data_store->lookup_nonce($consumer, $token, $nonce, $timestamp);
        if ($found) {
            throw new OAuthException("Nonce already used: $nonce");
        }
    }
}
class OAuthDataStore
{
    public function lookup_consumer($consumer_key)
    {
        // implement me

    }
    public function lookup_token($consumer, $token_type, $token)
    {
        // implement me

    }
    public function lookup_nonce($consumer, $token, $nonce, $timestamp)
    {
        // implement me

    }
    public function new_request_token($consumer)
    {
        // return a new token attached to this consumer

    }
    public function new_access_token($token, $consumer)
    {
        // return a new access token attached to this consumer
        // for the user associated with this token if the request token
        // is authorized
        // should also invalidate the request token

    }
}
class OAuthUtil
{
    public static function urlencode_rfc3986($input)
    {
        if (is_array($input)) {
            return array_map(array(
                'OAuthUtil',
                'urlencode_rfc3986'
            ) , $input);
        } else if (is_scalar($input)) {
            return str_replace('+', ' ', str_replace('%7E', '~', rawurlencode($input)));
        } else {
            return '';
        }
    }
    // This decode public function isn't taking into consideration the above
    // modifications to the encoding process. However, this method doesn't
    // seem to be used anywhere so leaving it as is.
    public static function urldecode_rfc3986($string)
    {
        return urldecode($string);
    }
    // Utility public function for turning the Authorization: header into
    // parameters, has to do some unescaping
    // Can filter out any non-oauth parameters if needed (default behaviour)
    public static function split_header($header, $only_allow_oauth_parameters = true)
    {
        $pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
        $offset = 0;
        $params = array();
        while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
            $match = $matches[0];
            $header_name = $matches[2][0];
            $header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
            if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
                $params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
            }
            $offset = $match[1]+strlen($match[0]);
        }
        if (isset($params['realm'])) {
            unset($params['realm']);
        }
        return $params;
    }
    // helper to try to sort out headers for people who aren't running apache
    public static function get_headers()
    {
        if (function_exists('apache_request_headers')) {
            // we need this to get the actual Authorization: header
            // because apache tends to tell us it doesn't exist
            return apache_request_headers();
        }
        // otherwise we don't have apache and are just going to have to hope
        // that $_SERVER actually contains what we need
        $out = array();
        foreach($_SERVER as $key => $value) {
            if (substr($key, 0, 5) == "HTTP_") {
                // this is chaos, basically it is just there to capitalize the first
                // letter of every word that is not an initial HTTP and strip HTTP
                // code from przemek
                $key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
                $out[$key] = $value;
            }
        }
        return $out;
    }
    // This public function takes a input like a=b&a=c&d=e and returns the parsed
    // parameters like this
    // array('a' => array('b','c'), 'd' => 'e')
    public static function parse_parameters($input)
    {
        if (!isset($input) || !$input) return array();
        $pairs = split('&', $input);
        $parsed_parameters = array();
        foreach($pairs as $pair) {
            $split = split('=', $pair, 2);
            $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
            $value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';
            if (isset($parsed_parameters[$parameter])) {
                // We have already recieved parameter(s) with this name, so add to the list
                // of parameters with this name
                if (is_scalar($parsed_parameters[$parameter])) {
                    // This is the first duplicate, so transform scalar (string) into an array
                    // so we can add the duplicates
                    $parsed_parameters[$parameter] = array(
                        $parsed_parameters[$parameter]
                    );
                }
                $parsed_parameters[$parameter][] = $value;
            } else {
                $parsed_parameters[$parameter] = $value;
            }
        }
        return $parsed_parameters;
    }
    public static function build_http_query($params)
    {
        if (!$params) return '';
        // Urlencode both keys and values
        $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
        $values = OAuthUtil::urlencode_rfc3986(array_values($params));
        $params = array_combine($keys, $values);
        // Parameters are sorted by name, using lexicographical byte value ordering.
        // Ref: Spec: 9.1.1 (1)
        uksort($params, 'strcmp');
        $pairs = array();
        foreach($params as $parameter => $value) {
            if (is_array($value)) {
                // If two or more parameters share the same name, they are sorted by their value
                // Ref: Spec: 9.1.1 (1)
                natsort($value);
                foreach($value as $duplicate_value) {
                    $pairs[] = $parameter . '=' . $duplicate_value;
                }
            } else {
                $pairs[] = $parameter . '=' . $value;
            }
        }
        // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
        // Each name-value pair is separated by an '&' character (ASCII code 38)
        return implode('&', $pairs);
    }
}
?>