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250 lines
11 KiB
PHP
250 lines
11 KiB
PHP
<?php
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/*
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* Copyright 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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require_once "external/OAuth.php";
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/**
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* Authentication class that deals with 3-Legged OAuth 1.0a authentication
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*
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* This class uses the OAuth 1.0a spec which has a slightly different work flow in
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* how callback urls, request & access tokens are dealt with to prevent a possible
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* man in the middle attack.
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*
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* @author Chris Chabot <chabotc@google.com>
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*
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*/
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class apiOAuth extends apiAuth {
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public $cacheKey;
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protected $consumerToken;
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protected $accessToken;
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protected $privateKeyFile;
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protected $developerKey;
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public $service;
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/**
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* Instantiates the class, but does not initiate the login flow, leaving it
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* to the discretion of the caller.
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*/
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public function __construct() {
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global $apiConfig;
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if (!empty($apiConfig['developer_key'])) {
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$this->setDeveloperKey($apiConfig['developer_key']);
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}
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$this->consumerToken = new apiClientOAuthConsumer($apiConfig['oauth_consumer_key'], $apiConfig['oauth_consumer_secret'], NULL);
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$this->signatureMethod = new apiClientOAuthSignatureMethod_HMAC_SHA1();
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$this->cacheKey = 'OAuth:' . $apiConfig['oauth_consumer_key']; // Scope data to the local user as well, or else multiple local users will share the same OAuth credentials.
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}
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/**
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* The 3 legged oauth class needs a way to store the access key and token
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* it uses the apiCache class to do so.
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*
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* Constructing this class will initiate the 3 legged oauth work flow, including redirecting
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* to the OAuth provider's site if required(!)
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*
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* @param string $consumerKey
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* @param string $consumerSecret
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* @return apiOAuth3Legged the logged-in provider instance
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*/
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public function authenticate($service) {
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global $apiConfig;
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$this->service = $service;
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$this->service['authorization_token_url'] .= '?scope=' . apiClientOAuthUtil::urlencodeRFC3986($service['scope']) . '&domain=' . apiClientOAuthUtil::urlencodeRFC3986($apiConfig['site_name']) . '&oauth_token=';
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if (isset($_GET['oauth_verifier']) && isset($_GET['oauth_token']) && isset($_GET['uid'])) {
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$uid = $_GET['uid'];
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$secret = apiClient::$cache->get($this->cacheKey.":nonce:" . $uid);
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apiClient::$cache->delete($this->cacheKey.":nonce:" . $uid);
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$token = $this->upgradeRequestToken($_GET['oauth_token'], $secret, $_GET['oauth_verifier']);
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return json_encode($token);
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} else {
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// Initialize the OAuth dance, first request a request token, then kick the client to the authorize URL
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// First we store the current URL in our cache, so that when the oauth dance is completed we can return there
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$callbackUrl = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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$uid = uniqid();
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$token = $this->obtainRequestToken($callbackUrl, $uid);
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apiClient::$cache->set($this->cacheKey.":nonce:" . $uid, $token->secret);
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$this->redirectToAuthorization($token);
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}
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}
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/**
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* Sets the internal oauth access token (which is returned by the authenticate function), a user should only
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* go through the authenticate() flow once (which involces a bunch of browser redirections and authentication screens, not fun)
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* and every time the user comes back the access token from the authentication() flow should be re-used (it essentially never expires)
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* @param object $accessToken
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*/
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public function setAccessToken($accessToken) {
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$accessToken = json_decode($accessToken, true);
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if ($accessToken == null) {
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throw new apiAuthException("Could not json decode the access token");
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}
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if (! isset($accessToken['key']) || ! isset($accessToken['secret'])) {
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throw new apiAuthException("Invalid OAuth token, missing key and/or secret");
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}
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$this->accessToken = new apiClientOAuthConsumer($accessToken['key'], $accessToken['secret']);
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}
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/**
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* Returns the current access token
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*/
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public function getAccessToken() {
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return $this->accessToken;
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}
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/**
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* Set the developer key to use, these are obtained through the API Console
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*/
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public function setDeveloperKey($developerKey) {
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$this->developerKey = $developerKey;
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}
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/**
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* Upgrades an existing request token to an access token.
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*
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* @param apiCache $cache cache class to use (file,apc,memcache,mysql)
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* @param oauthVerifier
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*/
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public function upgradeRequestToken($requestToken, $requestTokenSecret, $oauthVerifier) {
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$ret = $this->requestAccessToken($requestToken, $requestTokenSecret, $oauthVerifier);
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$matches = array();
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@parse_str($ret, $matches);
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if (!isset($matches['oauth_token']) || !isset($matches['oauth_token_secret'])) {
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throw new apiAuthException("Error authorizing access key (result was: {$ret})");
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}
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// The token was upgraded to an access token, we can now continue to use it.
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$this->accessToken = new apiClientOAuthConsumer(apiClientOAuthUtil::urldecodeRFC3986($matches['oauth_token']), apiClientOAuthUtil::urldecodeRFC3986($matches['oauth_token_secret']));
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return $this->accessToken;
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}
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/**
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* Sends the actual request to exchange an existing request token for an access token.
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*
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* @param string $requestToken the existing request token
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* @param string $requestTokenSecret the request token secret
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* @return array('http_code' => HTTP response code (200, 404, 401, etc), 'data' => the html document)
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*/
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protected function requestAccessToken($requestToken, $requestTokenSecret, $oauthVerifier) {
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$accessToken = new apiClientOAuthConsumer($requestToken, $requestTokenSecret);
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$accessRequest = apiClientOAuthRequest::from_consumer_and_token($this->consumerToken, $accessToken, "GET", $this->service['access_token_url'], array('oauth_verifier' => $oauthVerifier));
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$accessRequest->sign_request($this->signatureMethod, $this->consumerToken, $accessToken);
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$request = apiClient::$io->makeRequest(new apiHttpRequest($accessRequest));
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if ($request->getResponseHttpCode() != 200) {
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throw new apiAuthException("Could not fetch access token, http code: " . $request->getResponseHttpCode() . ', response body: '. $request->getResponseBody());
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}
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return $request->getResponseBody();
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}
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/**
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* Obtains a request token from the specified provider.
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*/
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public function obtainRequestToken($callbackUrl, $uid) {
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$callbackParams = (strpos($_SERVER['REQUEST_URI'], '?') !== false ? '&' : '?') . 'uid=' . urlencode($uid);
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$ret = $this->requestRequestToken($callbackUrl . $callbackParams);
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$matches = array();
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preg_match('/oauth_token=(.*)&oauth_token_secret=(.*)&oauth_callback_confirmed=(.*)/', $ret, $matches);
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if (!is_array($matches) || count($matches) != 4) {
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throw new apiAuthException("Error retrieving request key ({$ret})");
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}
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return new apiClientOAuthToken(apiClientOAuthUtil::urldecodeRFC3986($matches[1]), apiClientOAuthUtil::urldecodeRFC3986($matches[2]));
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}
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/**
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* Sends the actual request to obtain a request token.
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*
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* @return array('http_code' => HTTP response code (200, 404, 401, etc), 'data' => the html document)
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*/
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protected function requestRequestToken($callbackUrl) {
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$requestTokenRequest = apiClientOAuthRequest::from_consumer_and_token($this->consumerToken, NULL, "GET", $this->service['request_token_url'], array());
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$requestTokenRequest->set_parameter('scope', $this->service['scope']);
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$requestTokenRequest->set_parameter('oauth_callback', $callbackUrl);
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$requestTokenRequest->sign_request($this->signatureMethod, $this->consumerToken, NULL);
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$request = apiClient::$io->makeRequest(new apiHttpRequest($requestTokenRequest));
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if ($request->getResponseHttpCode() != 200) {
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throw new apiAuthException("Couldn't fetch request token, http code: " . $request->getResponseHttpCode() . ', response body: '. $request->getResponseBody());
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}
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return $request->getResponseBody();
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}
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/**
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* Redirect the uset to the (provider's) authorize page, if approved it should kick the user back to the call back URL
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* which hopefully means we'll end up in the constructor of this class again, but with oauth_continue=1 set
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*
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* @param OAuthToken $token the request token
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* @param string $callbackUrl the URL to return to post-authorization (passed to login site)
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*/
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public function redirectToAuthorization($token) {
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$authorizeRedirect = $this->service['authorization_token_url']. $token->key;
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header("Location: $authorizeRedirect");
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}
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/**
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* Sign the request using OAuth. This uses the consumer token and key
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*
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* @param string $method the method (get/put/delete/post)
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* @param string $url the url to sign (http://site/social/rest/people/1/@me)
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* @param array $params the params that should be appended to the url (count=20 fields=foo, etc)
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* @param string $postBody for POST/PUT requests, the postBody is included in the signature
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* @return string the signed url
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*/
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public function sign(apiHttpRequest $request) {
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// add the developer key to the request before signing it
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if ($this->developerKey) {
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$request->setUrl($request->getUrl() . ((strpos($request->getUrl(), '?') === false) ? '?' : '&') . 'key='.urlencode($this->developerKey));
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}
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// and sign the request
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$oauthRequest = apiClientOAuthRequest::from_request($request->getMethod(), $request->getBaseUrl(), $request->getQueryParams());
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$params = $this->mergeParameters($request->getQueryParams());
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foreach ($params as $key => $val) {
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if (is_array($val)) {
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$val = implode(',', $val);
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}
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$oauthRequest->set_parameter($key, $val);
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}
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$oauthRequest->sign_request($this->signatureMethod, $this->consumerToken, $this->accessToken);
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$authHeaders = $oauthRequest->to_header();
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$headers = $request->getHeaders();
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$headers[] = $authHeaders;
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$request->setHeaders($headers);
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// and add the access token key to it (since it doesn't include the secret, it's still secure to store this in cache)
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$request->accessKey = $this->accessToken->key;
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return $request;
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}
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/**
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* Merges the supplied parameters with reasonable defaults for 2 legged oauth. User-supplied parameters
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* will have precedent over the defaults.
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*
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* @param array $params the user-supplied params that will be appended to the url
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* @return array the combined parameters
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*/
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protected function mergeParameters($params) {
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$defaults = array(
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'oauth_nonce' => md5(microtime() . mt_rand()),
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'oauth_version' => apiClientOAuthRequest::$version, 'oauth_timestamp' => time(),
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'oauth_consumer_key' => $this->consumerToken->key
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);
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if ($this->accessToken != null) {
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$params['oauth_token'] = $this->accessToken->key;
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}
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return array_merge($defaults, $params);
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}
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public function createAuthUrl($scope) {return null;}
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public function refreshToken($refreshToken) {/* noop*/}
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public function revokeToken() {/* noop*/}
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} |