483 lines
15 KiB
PHP
Executable File
483 lines
15 KiB
PHP
Executable File
<?php
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/* Generic exception class
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*/
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class apiClientOAuthException extends Exception {
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// pass
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}
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class apiClientOAuthConsumer {
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public $key;
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public $secret;
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public function __construct($key, $secret, $callback_url=NULL) {
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$this->key = $key;
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$this->secret = $secret;
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$this->callback_url = $callback_url;
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}
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}
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class apiClientOAuthToken {
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// access tokens and request tokens
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public $key;
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public $secret;
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/**
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* key = the token
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* secret = the token secret
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*/
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function __construct($key, $secret) {
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$this->key = $key;
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$this->secret = $secret;
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}
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/**
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* generates the basic string serialization of a token that a server
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* would respond to request_token and access_token calls with
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*/
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function to_string() {
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return "oauth_token=" . apiClientOAuthUtil::urlencodeRFC3986($this->key) .
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"&oauth_token_secret=" . apiClientOAuthUtil::urlencodeRFC3986($this->secret);
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}
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function __toString() {
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return $this->to_string();
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}
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}
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class apiClientOAuthSignatureMethod {
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public function check_signature(&$request, $consumer, $token, $signature) {
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$built = $this->build_signature($request, $consumer, $token);
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return $built == $signature;
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}
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}
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class apiClientOAuthSignatureMethod_HMAC_SHA1 extends apiClientOAuthSignatureMethod {
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function get_name() {
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return "HMAC-SHA1";
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}
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public function build_signature($request, $consumer, $token, $privKey=NULL) {
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$base_string = $request->get_signature_base_string();
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$request->base_string = $base_string;
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$key_parts = array(
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$consumer->secret,
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($token) ? $token->secret : ""
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);
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$key_parts = array_map(array('apiClientOAuthUtil','urlencodeRFC3986'), $key_parts);
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$key = implode('&', $key_parts);
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return base64_encode( hash_hmac('sha1', $base_string, $key, true));
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}
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}
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class apiClientOAuthSignatureMethod_RSA_SHA1 extends apiClientOAuthSignatureMethod {
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public function get_name() {
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return "RSA-SHA1";
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}
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protected function fetch_public_cert(&$request) {
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// not implemented yet, ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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// (2) fetch via http using a url provided by the requester
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// (3) some sort of specific discovery code based on request
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//
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// either way should return a string representation of the certificate
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throw Exception("fetch_public_cert not implemented");
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}
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protected function fetch_private_cert($privKey) {//&$request) {
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// not implemented yet, ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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//
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// either way should return a string representation of the certificate
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throw Exception("fetch_private_cert not implemented");
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}
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public function build_signature(&$request, $consumer, $token, $privKey) {
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$base_string = $request->get_signature_base_string();
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// Fetch the private key cert based on the request
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//$cert = $this->fetch_private_cert($consumer->privKey);
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//Pull the private key ID from the certificate
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//$privatekeyid = openssl_get_privatekey($cert);
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// hacked in
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if ($privKey == '') {
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$fp = fopen($GLOBALS['PRIV_KEY_FILE'], "r");
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$privKey = fread($fp, 8192);
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fclose($fp);
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}
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$privatekeyid = openssl_get_privatekey($privKey);
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//Check the computer signature against the one passed in the query
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$ok = openssl_sign($base_string, $signature, $privatekeyid);
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//Release the key resource
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openssl_free_key($privatekeyid);
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return base64_encode($signature);
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}
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public function check_signature(&$request, $consumer, $token, $signature) {
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$decoded_sig = base64_decode($signature);
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$base_string = $request->get_signature_base_string();
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// Fetch the public key cert based on the request
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$cert = $this->fetch_public_cert($request);
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//Pull the public key ID from the certificate
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$publickeyid = openssl_get_publickey($cert);
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//Check the computer signature against the one passed in the query
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$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
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//Release the key resource
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openssl_free_key($publickeyid);
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return $ok == 1;
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}
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}
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class apiClientOAuthRequest {
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private $parameters;
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private $http_method;
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private $http_url;
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// for debug purposes
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public $base_string;
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public static $version = '1.0';
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function __construct($http_method, $http_url, $parameters=NULL) {
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@$parameters or $parameters = array();
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$this->parameters = $parameters;
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$this->http_method = $http_method;
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$this->http_url = $http_url;
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}
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/**
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* attempt to build up a request from what was passed to the server
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*/
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public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {
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$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on") ? 'http' : 'https';
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@$http_url or $http_url = $scheme . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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@$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
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$request_headers = apiClientOAuthRequest::get_headers();
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// let the library user override things however they'd like, if they know
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// which parameters to use then go for it, for example XMLRPC might want to
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// do this
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if ($parameters) {
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$req = new apiClientOAuthRequest($http_method, $http_url, $parameters);
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}
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// next check for the auth header, we need to do some extra stuff
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// if that is the case, namely suck in the parameters from GET or POST
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// so that we can include them in the signature
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else if (@substr($request_headers['Authorization'], 0, 5) == "OAuth") {
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$header_parameters = apiClientOAuthRequest::split_header($request_headers['Authorization']);
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if ($http_method == "GET") {
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$req_parameters = $_GET;
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}
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else if ($http_method = "POST") {
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$req_parameters = $_POST;
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}
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$parameters = array_merge($header_parameters, $req_parameters);
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$req = new apiClientOAuthRequest($http_method, $http_url, $parameters);
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}
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else if ($http_method == "GET") {
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$req = new apiClientOAuthRequest($http_method, $http_url, $_GET);
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}
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else if ($http_method == "POST") {
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$req = new apiClientOAuthRequest($http_method, $http_url, $_POST);
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}
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return $req;
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}
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/**
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* pretty much a helper function to set up the request
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*/
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public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {
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@$parameters or $parameters = array();
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$defaults = array("oauth_version" => apiClientOAuthRequest::$version,
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"oauth_nonce" => apiClientOAuthRequest::generate_nonce(),
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"oauth_timestamp" => apiClientOAuthRequest::generate_timestamp(),
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"oauth_consumer_key" => $consumer->key);
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$parameters = array_merge($defaults, $parameters);
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if ($token) {
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$parameters['oauth_token'] = $token->key;
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}
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// oauth v1.0a
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/*if (isset($_REQUEST['oauth_verifier'])) {
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$parameters['oauth_verifier'] = $_REQUEST['oauth_verifier'];
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}*/
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return new apiClientOAuthRequest($http_method, $http_url, $parameters);
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}
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public function set_parameter($name, $value) {
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$this->parameters[$name] = $value;
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}
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public function get_parameter($name) {
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return $this->parameters[$name];
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}
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public function get_parameters() {
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return $this->parameters;
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}
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/**
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* Returns the normalized parameters of the request
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* This will be all (except oauth_signature) parameters,
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* sorted first by key, and if duplicate keys, then by
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* value.
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* The returned string will be all the key=value pairs
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* concated by &.
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* @return string
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*/
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public function get_signable_parameters() {
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// Grab all parameters
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$params = $this->parameters;
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// Remove oauth_signature if present
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if (isset($params['oauth_signature'])) {
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unset($params['oauth_signature']);
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}
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// Urlencode both keys and values
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$keys = array_map(array('apiClientOAuthUtil', 'urlencodeRFC3986'), array_keys($params));
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$values = array_map(array('apiClientOAuthUtil', 'urlencodeRFC3986'), array_values($params));
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$params = array_combine($keys, $values);
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// Sort by keys (natsort)
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uksort($params, 'strnatcmp');
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if(isset($params['title']) && isset($params['title-exact'])) {
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$temp = $params['title-exact'];
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$title = $params['title'];
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unset($params['title']);
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unset($params['title-exact']);
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$params['title-exact'] = $temp;
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$params['title'] = $title;
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}
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// Generate key=value pairs
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$pairs = array();
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foreach ($params as $key=>$value ) {
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if (is_array($value)) {
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// If the value is an array, it's because there are multiple
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// with the same key, sort them, then add all the pairs
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natsort($value);
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foreach ($value as $v2) {
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$pairs[] = $key . '=' . $v2;
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}
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} else {
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$pairs[] = $key . '=' . $value;
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}
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}
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// Return the pairs, concated with &
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return implode('&', $pairs);
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}
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/**
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* Returns the base string of this request
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* The base string defined as the method, the url
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* and the parameters (normalized), each urlencoded
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* and the concated with &.
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*/
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public function get_signature_base_string() {
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$parts = array(
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$this->get_normalized_http_method(),
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$this->get_normalized_http_url(),
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$this->get_signable_parameters()
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);
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$parts = array_map(array('apiClientOAuthUtil', 'urlencodeRFC3986'), $parts);
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return implode('&', $parts);
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}
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/**
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* just uppercases the http method
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*/
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public function get_normalized_http_method() {
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return strtoupper($this->http_method);
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}
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/**
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* parses the url and rebuilds it to be
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* scheme://host/path
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*/
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public function get_normalized_http_url() {
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$parts = parse_url($this->http_url);
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// FIXME: port should handle according to http://groups.google.com/group/oauth/browse_thread/thread/1b203a51d9590226
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$port = (isset($parts['port']) && $parts['port'] != '80') ? ':' . $parts['port'] : '';
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$path = (isset($parts['path'])) ? $parts['path'] : '';
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return $parts['scheme'] . '://' . $parts['host'] . $port . $path;
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}
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/**
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* builds a url usable for a GET request
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*/
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public function to_url() {
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$out = $this->get_normalized_http_url() . "?";
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$out .= $this->to_postdata();
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return $out;
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}
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/**
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* builds the data one would send in a POST request
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*/
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public function to_postdata() {
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$total = array();
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foreach ($this->parameters as $k => $v) {
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$total[] = apiClientOAuthUtil::urlencodeRFC3986($k) . "=" . apiClientOAuthUtil::urlencodeRFC3986($v);
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}
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$out = implode("&", $total);
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return $out;
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}
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/**
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* builds the Authorization: header
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*/
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public function to_header() {
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$out ='Authorization: OAuth ';
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$total = array();
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foreach ($this->parameters as $k => $v) {
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if (substr($k, 0, 5) != "oauth") continue;
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$out .= apiClientOAuthUtil::urlencodeRFC3986($k) . '="' . apiClientOAuthUtil::urlencodeRFC3986($v) . '", ';
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}
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$out = substr_replace($out, '', strlen($out) - 2);
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return $out;
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}
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public function __toString() {
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return $this->to_url();
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}
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public function sign_request($signature_method, $consumer, $token, $privKey=NULL) {
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$this->set_parameter("oauth_signature_method", $signature_method->get_name());
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$signature = $this->build_signature($signature_method, $consumer, $token, $privKey);
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$this->set_parameter("oauth_signature", $signature);
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}
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public function build_signature($signature_method, $consumer, $token, $privKey=NULL) {
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$signature = $signature_method->build_signature($this, $consumer, $token, $privKey);
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return $signature;
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}
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/**
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* util function: current timestamp
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*/
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private static function generate_timestamp() {
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return time();
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}
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/**
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* util function: current nonce
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*/
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private static function generate_nonce() {
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$mt = microtime();
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$rand = mt_rand();
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return md5($mt . $rand); // md5s look nicer than numbers
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}
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/**
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* util function for turning the Authorization: header into
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* parameters, has to do some unescaping
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*/
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private static function split_header($header) {
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// this should be a regex
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// error cases: commas in parameter values
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$parts = explode(",", $header);
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$out = array();
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foreach ($parts as $param) {
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$param = ltrim($param);
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// skip the "realm" param, nobody ever uses it anyway
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if (substr($param, 0, 5) != "oauth") continue;
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$param_parts = explode("=", $param);
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// rawurldecode() used because urldecode() will turn a "+" in the
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// value into a space
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$out[$param_parts[0]] = rawurldecode(substr($param_parts[1], 1, -1));
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}
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return $out;
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}
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/**
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* helper to try to sort out headers for people who aren't running apache
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*/
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private static function get_headers() {
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if (function_exists('apache_request_headers')) {
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// we need this to get the actual Authorization: header
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// because apache tends to tell us it doesn't exist
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return apache_request_headers();
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}
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// otherwise we don't have apache and are just going to have to hope
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// that $_SERVER actually contains what we need
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$out = array();
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foreach ($_SERVER as $key => $value) {
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if (substr($key, 0, 5) == "HTTP_") {
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// this is chaos, basically it is just there to capitalize the first
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// letter of every word that is not an initial HTTP and strip HTTP
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// code from przemek
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$key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
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$out[$key] = $value;
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}
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}
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return $out;
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}
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}
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class apiClientOAuthDataStore {
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function lookup_consumer($consumer_key) {
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// implement me
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}
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function lookup_token($consumer, $token_type, $token) {
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// implement me
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}
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function lookup_nonce($consumer, $token, $nonce, $timestamp) {
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// implement me
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}
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function fetch_request_token($consumer) {
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// return a new token attached to this consumer
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}
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function fetch_access_token($token, $consumer) {
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// return a new access token attached to this consumer
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// for the user associated with this token if the request token
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// is authorized
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// should also invalidate the request token
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}
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}
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class apiClientOAuthUtil {
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public static function urlencodeRFC3986($string) {
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return str_replace('%7E', '~', rawurlencode($string));
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}
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public static function urldecodeRFC3986($string) {
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return rawurldecode($string);
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}
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}
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