722 lines
22 KiB
PHP
Executable file
722 lines
22 KiB
PHP
Executable file
<?php
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/**
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* The default Cache Lifetime (in seconds).
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*/
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define("OAUTH2_DEFAULT_EXPIRES_IN", 3600);
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/**
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* The default Base domain for the Cookie.
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*/
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define("OAUTH2_DEFAULT_BASE_DOMAIN", '');
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/**
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* OAuth2.0 draft v10 client-side implementation.
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*
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* @author Originally written by Naitik Shah <naitik@facebook.com>.
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* @author Update to draft v10 by Edison Wong <hswong3i@pantarei-design.com>.
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*
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* @sa <a href="https://github.com/facebook/php-sdk">Facebook PHP SDK</a>.
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*/
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abstract class OAuth2Client {
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/**
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* Array of persistent variables stored.
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*/
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protected $conf = array();
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/**
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* Returns a persistent variable.
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*
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* To avoid problems, always use lower case for persistent variable names.
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*
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* @param $name
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* The name of the variable to return.
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* @param $default
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* The default value to use if this variable has never been set.
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*
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* @return
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* The value of the variable.
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*/
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public function getVariable($name, $default = NULL) {
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return isset($this->conf[$name]) ? $this->conf[$name] : $default;
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}
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/**
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* Sets a persistent variable.
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*
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* To avoid problems, always use lower case for persistent variable names.
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*
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* @param $name
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* The name of the variable to set.
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* @param $value
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* The value to set.
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*/
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public function setVariable($name, $value) {
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$this->conf[$name] = $value;
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return $this;
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}
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// Stuff that should get overridden by subclasses.
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//
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// I don't want to make these abstract, because then subclasses would have
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// to implement all of them, which is too much work.
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//
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// So they're just stubs. Override the ones you need.
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/**
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* Initialize a Drupal OAuth2.0 Application.
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*
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* @param $config
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* An associative array as below:
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* - base_uri: The base URI for the OAuth2.0 endpoints.
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* - code: (optional) The authorization code.
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* - username: (optional) The username.
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* - password: (optional) The password.
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* - client_id: (optional) The application ID.
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* - client_secret: (optional) The application secret.
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* - authorize_uri: (optional) The end-user authorization endpoint URI.
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* - access_token_uri: (optional) The token endpoint URI.
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* - services_uri: (optional) The services endpoint URI.
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* - cookie_support: (optional) TRUE to enable cookie support.
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* - base_domain: (optional) The domain for the cookie.
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* - file_upload_support: (optional) TRUE if file uploads are enabled.
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*/
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public function __construct($config = array()) {
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// We must set base_uri first.
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$this->setVariable('base_uri', $config['base_uri']);
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unset($config['base_uri']);
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// Use predefined OAuth2.0 params, or get it from $_REQUEST.
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foreach (array('code', 'username', 'password') as $name) {
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if (isset($config[$name]))
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$this->setVariable($name, $config[$name]);
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else if (isset($_REQUEST[$name]) && !empty($_REQUEST[$name]))
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$this->setVariable($name, $_REQUEST[$name]);
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unset($config[$name]);
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}
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// Endpoint URIs.
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foreach (array('authorize_uri', 'access_token_uri', 'services_uri') as $name) {
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if (isset($config[$name]))
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if (substr($config[$name], 0, 4) == "http")
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$this->setVariable($name, $config[$name]);
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else
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$this->setVariable($name, $this->getVariable('base_uri') . $config[$name]);
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unset($config[$name]);
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}
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// Other else configurations.
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foreach ($config as $name => $value) {
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$this->setVariable($name, $value);
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}
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}
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/**
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* Try to get session object from custom method.
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*
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* By default we generate session object based on access_token response, or
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* if it is provided from server with $_REQUEST. For sure, if it is provided
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* by server it should follow our session object format.
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*
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* Session object provided by server can ensure the correct expirse and
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* base_domain setup as predefined in server, also you may get more useful
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* information for custom functionality, too. BTW, this may require for
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* additional remote call overhead.
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*
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* You may wish to override this function with your custom version due to
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* your own server-side implementation.
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*
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* @param $access_token
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* (optional) A valid access token in associative array as below:
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* - access_token: A valid access_token generated by OAuth2.0
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* authorization endpoint.
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* - expires_in: (optional) A valid expires_in generated by OAuth2.0
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* authorization endpoint.
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* - refresh_token: (optional) A valid refresh_token generated by OAuth2.0
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* authorization endpoint.
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* - scope: (optional) A valid scope generated by OAuth2.0
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* authorization endpoint.
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*
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* @return
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* A valid session object in associative array for setup cookie, and
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* NULL if not able to generate it with custom method.
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*/
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protected function getSessionObject($access_token = NULL) {
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$session = NULL;
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// Try generate local version of session cookie.
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if (!empty($access_token) && isset($access_token['access_token'])) {
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$session['access_token'] = $access_token['access_token'];
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$session['base_domain'] = $this->getVariable('base_domain', OAUTH2_DEFAULT_BASE_DOMAIN);
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$session['expirse'] = isset($access_token['expires_in']) ? time() + $access_token['expires_in'] : time() + $this->getVariable('expires_in', OAUTH2_DEFAULT_EXPIRES_IN);
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$session['refresh_token'] = isset($access_token['refresh_token']) ? $access_token['refresh_token'] : '';
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$session['scope'] = isset($access_token['scope']) ? $access_token['scope'] : '';
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$session['secret'] = md5(base64_encode(pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), uniqid())));
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// Provide our own signature.
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$sig = self::generateSignature(
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$session,
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$this->getVariable('client_secret')
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);
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$session['sig'] = $sig;
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}
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// Try loading session from $_REQUEST.
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if (!$session && isset($_REQUEST['session'])) {
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$session = json_decode(
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get_magic_quotes_gpc()
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? stripslashes($_REQUEST['session'])
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: $_REQUEST['session'],
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TRUE
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);
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}
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return $session;
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}
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/**
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* Make an API call.
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*
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* Support both OAuth2.0 or normal GET/POST API call, with relative
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* or absolute URI.
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*
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* If no valid OAuth2.0 access token found in session object, this function
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* will automatically switch as normal remote API call without "oauth_token"
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* parameter.
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*
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* Assume server reply in JSON object and always decode during return. If
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* you hope to issue a raw query, please use makeRequest().
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*
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* @param $path
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* The target path, relative to base_path/service_uri or an absolute URI.
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* @param $method
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* (optional) The HTTP method (default 'GET').
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* @param $params
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* (optional The GET/POST parameters.
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*
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* @return
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* The JSON decoded response object.
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*
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* @throws OAuth2Exception
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*/
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public function api($path, $method = 'GET', $params = array()) {
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if (is_array($method) && empty($params)) {
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$params = $method;
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$method = 'GET';
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}
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// json_encode all params values that are not strings.
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foreach ($params as $key => $value) {
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if (!is_string($value)) {
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$params[$key] = json_encode($value);
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}
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}
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$result = json_decode($this->makeOAuth2Request(
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$this->getUri($path),
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$method,
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$params
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), TRUE);
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// Results are returned, errors are thrown.
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if (is_array($result) && isset($result['error'])) {
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$e = new OAuth2Exception($result);
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switch ($e->getType()) {
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// OAuth 2.0 Draft 10 style.
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case 'invalid_token':
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$this->setSession(NULL);
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default:
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$this->setSession(NULL);
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}
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throw $e;
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}
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return $result;
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}
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// End stuff that should get overridden.
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/**
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* Default options for cURL.
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*/
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public static $CURL_OPTS = array(
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CURLOPT_CONNECTTIMEOUT => 10,
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CURLOPT_RETURNTRANSFER => TRUE,
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CURLOPT_HEADER => TRUE,
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CURLOPT_TIMEOUT => 60,
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CURLOPT_USERAGENT => 'oauth2-draft-v10',
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CURLOPT_HTTPHEADER => array("Accept: application/json"),
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);
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/**
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* Set the Session.
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*
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* @param $session
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* (optional) The session object to be set. NULL if hope to frush existing
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* session object.
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* @param $write_cookie
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* (optional) TRUE if a cookie should be written. This value is ignored
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* if cookie support has been disabled.
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*
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* @return
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* The current OAuth2.0 client-side instance.
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*/
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public function setSession($session = NULL, $write_cookie = TRUE) {
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$this->setVariable('_session', $this->validateSessionObject($session));
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$this->setVariable('_session_loaded', TRUE);
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if ($write_cookie) {
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$this->setCookieFromSession($this->getVariable('_session'));
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}
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return $this;
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}
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/**
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* Get the session object.
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*
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* This will automatically look for a signed session via custom method,
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* OAuth2.0 grant type with authorization_code, OAuth2.0 grant type with
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* password, or cookie that we had already setup.
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*
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* @return
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* The valid session object with OAuth2.0 infomration, and NULL if not
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* able to discover any cases.
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*/
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public function getSession() {
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if (!$this->getVariable('_session_loaded')) {
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$session = NULL;
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$write_cookie = TRUE;
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// Try obtain login session by custom method.
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$session = $this->getSessionObject(NULL);
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$session = $this->validateSessionObject($session);
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// grant_type == authorization_code.
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if (!$session && $this->getVariable('code')) {
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$access_token = $this->getAccessTokenFromAuthorizationCode($this->getVariable('code'));
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$session = $this->getSessionObject($access_token);
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$session = $this->validateSessionObject($session);
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}
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// grant_type == password.
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if (!$session && $this->getVariable('username') && $this->getVariable('password')) {
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$access_token = $this->getAccessTokenFromPassword($this->getVariable('username'), $this->getVariable('password'));
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$session = $this->getSessionObject($access_token);
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$session = $this->validateSessionObject($session);
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}
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// Try loading session from cookie if necessary.
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if (!$session && $this->getVariable('cookie_support')) {
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$cookie_name = $this->getSessionCookieName();
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if (isset($_COOKIE[$cookie_name])) {
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$session = array();
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parse_str(trim(
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get_magic_quotes_gpc()
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? stripslashes($_COOKIE[$cookie_name])
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: $_COOKIE[$cookie_name],
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'"'
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), $session);
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$session = $this->validateSessionObject($session);
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// Write only if we need to delete a invalid session cookie.
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$write_cookie = empty($session);
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}
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}
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$this->setSession($session, $write_cookie);
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}
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return $this->getVariable('_session');
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}
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/**
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* Gets an OAuth2.0 access token from session.
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*
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* This will trigger getSession() and so we MUST initialize with required
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* configuration.
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*
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* @return
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* The valid OAuth2.0 access token, and NULL if not exists in session.
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*/
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public function getAccessToken() {
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$session = $this->getSession();
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return isset($session['access_token']) ? $session['access_token'] : NULL;
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}
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/**
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* Get access token from OAuth2.0 token endpoint with authorization code.
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*
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* This function will only be activated if both access token URI, client
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* identifier and client secret are setup correctly.
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*
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* @param $code
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* Authorization code issued by authorization server's authorization
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* endpoint.
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*
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* @return
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* A valid OAuth2.0 JSON decoded access token in associative array, and
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* NULL if not enough parameters or JSON decode failed.
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*/
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private function getAccessTokenFromAuthorizationCode($code) {
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if ($this->getVariable('access_token_uri') && $this->getVariable('client_id') && $this->getVariable('client_secret')) {
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return json_decode($this->makeRequest(
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$this->getVariable('access_token_uri'),
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'POST',
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array(
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'grant_type' => 'authorization_code',
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'client_id' => $this->getVariable('client_id'),
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'client_secret' => $this->getVariable('client_secret'),
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'code' => $code,
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'redirect_uri' => $this->getCurrentUri(),
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)
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), TRUE);
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}
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return NULL;
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}
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/**
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* Get access token from OAuth2.0 token endpoint with basic user
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* credentials.
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*
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* This function will only be activated if both username and password
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* are setup correctly.
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*
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* @param $username
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* Username to be check with.
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* @param $password
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* Password to be check with.
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*
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* @return
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* A valid OAuth2.0 JSON decoded access token in associative array, and
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* NULL if not enough parameters or JSON decode failed.
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*/
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private function getAccessTokenFromPassword($username, $password) {
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if ($this->getVariable('access_token_uri') && $this->getVariable('client_id') && $this->getVariable('client_secret')) {
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return json_decode($this->makeRequest(
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$this->getVariable('access_token_uri'),
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'POST',
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array(
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'grant_type' => 'password',
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'client_id' => $this->getVariable('client_id'),
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'client_secret' => $this->getVariable('client_secret'),
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'username' => $username,
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'password' => $password,
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)
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), TRUE);
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}
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return NULL;
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}
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/**
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* Make an OAuth2.0 Request.
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*
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* Automatically append "oauth_token" in query parameters if not yet
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* exists and able to discover a valid access token from session. Otherwise
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* just ignore setup with "oauth_token" and handle the API call AS-IS, and
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* so may issue a plain API call without OAuth2.0 protection.
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*
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* @param $path
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* The target path, relative to base_path/service_uri or an absolute URI.
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* @param $method
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* (optional) The HTTP method (default 'GET').
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* @param $params
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* (optional The GET/POST parameters.
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*
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* @return
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* The JSON decoded response object.
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*
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* @throws OAuth2Exception
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*/
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protected function makeOAuth2Request($path, $method = 'GET', $params = array()) {
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if ((!isset($params['oauth_token']) || empty($params['oauth_token'])) && $oauth_token = $this->getAccessToken()) {
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$params['oauth_token'] = $oauth_token;
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}
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return $this->makeRequest($path, $method, $params);
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}
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/**
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* Makes an HTTP request.
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*
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* This method can be overriden by subclasses if developers want to do
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* fancier things or use something other than cURL to make the request.
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*
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* @param $path
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* The target path, relative to base_path/service_uri or an absolute URI.
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* @param $method
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* (optional) The HTTP method (default 'GET').
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* @param $params
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* (optional The GET/POST parameters.
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* @param $ch
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* (optional) An initialized curl handle
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*
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* @return
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* The JSON decoded response object.
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*/
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protected function makeRequest($path, $method = 'GET', $params = array(), $ch = NULL) {
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if (!$ch)
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$ch = curl_init();
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$opts = self::$CURL_OPTS;
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if ($params) {
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switch ($method) {
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case 'GET':
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$path .= '?' . http_build_query($params, NULL, '&');
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break;
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// Method override as we always do a POST.
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default:
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if ($this->getVariable('file_upload_support')) {
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$opts[CURLOPT_POSTFIELDS] = $params;
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}
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else {
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$opts[CURLOPT_POSTFIELDS] = http_build_query($params, NULL, '&');
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}
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}
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}
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$opts[CURLOPT_URL] = $path;
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// Disable the 'Expect: 100-continue' behaviour. This causes CURL to wait
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// for 2 seconds if the server does not support this header.
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if (isset($opts[CURLOPT_HTTPHEADER])) {
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$existing_headers = $opts[CURLOPT_HTTPHEADER];
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$existing_headers[] = 'Expect:';
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$opts[CURLOPT_HTTPHEADER] = $existing_headers;
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}
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else {
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$opts[CURLOPT_HTTPHEADER] = array('Expect:');
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}
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curl_setopt_array($ch, $opts);
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$result = curl_exec($ch);
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if (curl_errno($ch) == 60) { // CURLE_SSL_CACERT
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error_log('Invalid or no certificate authority found, using bundled information');
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curl_setopt($ch, CURLOPT_CAINFO,
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dirname(__FILE__) . '/fb_ca_chain_bundle.crt');
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$result = curl_exec($ch);
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}
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if ($result === FALSE) {
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$e = new OAuth2Exception(array(
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'code' => curl_errno($ch),
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'message' => curl_error($ch),
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));
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curl_close($ch);
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throw $e;
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}
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curl_close($ch);
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// Split the HTTP response into header and body.
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list($headers, $body) = explode("\r\n\r\n", $result);
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$headers = explode("\r\n", $headers);
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// We catch HTTP/1.1 4xx or HTTP/1.1 5xx error response.
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if (strpos($headers[0], 'HTTP/1.1 4') !== FALSE || strpos($headers[0], 'HTTP/1.1 5') !== FALSE) {
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$result = array(
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'code' => 0,
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'message' => '',
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);
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|
if (preg_match('/^HTTP\/1.1 ([0-9]{3,3}) (.*)$/', $headers[0], $matches)) {
|
|
$result['code'] = $matches[1];
|
|
$result['message'] = $matches[2];
|
|
}
|
|
|
|
// In case retrun with WWW-Authenticate replace the description.
|
|
foreach ($headers as $header) {
|
|
if (preg_match("/^WWW-Authenticate:.*error='(.*)'/", $header, $matches)) {
|
|
$result['error'] = $matches[1];
|
|
}
|
|
}
|
|
|
|
return json_encode($result);
|
|
}
|
|
|
|
return $body;
|
|
}
|
|
|
|
/**
|
|
* The name of the cookie that contains the session object.
|
|
*
|
|
* @return
|
|
* The cookie name.
|
|
*/
|
|
private function getSessionCookieName() {
|
|
return 'oauth2_' . $this->getVariable('client_id');
|
|
}
|
|
|
|
/**
|
|
* Set a JS Cookie based on the _passed in_ session.
|
|
*
|
|
* It does not use the currently stored session - you need to explicitly
|
|
* pass it in.
|
|
*
|
|
* @param $session
|
|
* The session to use for setting the cookie.
|
|
*/
|
|
protected function setCookieFromSession($session = NULL) {
|
|
if (!$this->getVariable('cookie_support'))
|
|
return;
|
|
|
|
$cookie_name = $this->getSessionCookieName();
|
|
$value = 'deleted';
|
|
$expires = time() - 3600;
|
|
$base_domain = $this->getVariable('base_domain', OAUTH2_DEFAULT_BASE_DOMAIN);
|
|
if ($session) {
|
|
$value = '"' . http_build_query($session, NULL, '&') . '"';
|
|
$base_domain = isset($session['base_domain']) ? $session['base_domain'] : $base_domain;
|
|
$expires = isset($session['expires']) ? $session['expires'] : time() + $this->getVariable('expires_in', OAUTH2_DEFAULT_EXPIRES_IN);
|
|
}
|
|
|
|
// Prepend dot if a domain is found.
|
|
if ($base_domain)
|
|
$base_domain = '.' . $base_domain;
|
|
|
|
// If an existing cookie is not set, we dont need to delete it.
|
|
if ($value == 'deleted' && empty($_COOKIE[$cookie_name]))
|
|
return;
|
|
|
|
if (headers_sent())
|
|
error_log('Could not set cookie. Headers already sent.');
|
|
else
|
|
setcookie($cookie_name, $value, $expires, '/', $base_domain);
|
|
}
|
|
|
|
/**
|
|
* Validates a session_version = 3 style session object.
|
|
*
|
|
* @param $session
|
|
* The session object.
|
|
*
|
|
* @return
|
|
* The session object if it validates, NULL otherwise.
|
|
*/
|
|
protected function validateSessionObject($session) {
|
|
// Make sure some essential fields exist.
|
|
if (is_array($session) && isset($session['access_token']) && isset($session['sig'])) {
|
|
// Validate the signature.
|
|
$session_without_sig = $session;
|
|
unset($session_without_sig['sig']);
|
|
|
|
$expected_sig = self::generateSignature(
|
|
$session_without_sig,
|
|
$this->getVariable('client_secret')
|
|
);
|
|
|
|
if ($session['sig'] != $expected_sig) {
|
|
error_log('Got invalid session signature in cookie.');
|
|
$session = NULL;
|
|
}
|
|
}
|
|
else {
|
|
$session = NULL;
|
|
}
|
|
return $session;
|
|
}
|
|
|
|
/**
|
|
* Since $_SERVER['REQUEST_URI'] is only available on Apache, we
|
|
* generate an equivalent using other environment variables.
|
|
*/
|
|
function getRequestUri() {
|
|
if (isset($_SERVER['REQUEST_URI'])) {
|
|
$uri = $_SERVER['REQUEST_URI'];
|
|
}
|
|
else {
|
|
if (isset($_SERVER['argv'])) {
|
|
$uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['argv'][0];
|
|
}
|
|
elseif (isset($_SERVER['QUERY_STRING'])) {
|
|
$uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
|
|
}
|
|
else {
|
|
$uri = $_SERVER['SCRIPT_NAME'];
|
|
}
|
|
}
|
|
// Prevent multiple slashes to avoid cross site requests via the Form API.
|
|
$uri = '/' . ltrim($uri, '/');
|
|
|
|
return $uri;
|
|
}
|
|
|
|
/**
|
|
* Returns the Current URL.
|
|
*
|
|
* @return
|
|
* The current URL.
|
|
*/
|
|
protected function getCurrentUri() {
|
|
$protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on'
|
|
? 'https://'
|
|
: 'http://';
|
|
$current_uri = $protocol . $_SERVER['HTTP_HOST'] . $this->getRequestUri();
|
|
$parts = parse_url($current_uri);
|
|
|
|
$query = '';
|
|
if (!empty($parts['query'])) {
|
|
$params = array();
|
|
parse_str($parts['query'], $params);
|
|
$params = array_filter($params);
|
|
if (!empty($params)) {
|
|
$query = '?' . http_build_query($params, NULL, '&');
|
|
}
|
|
}
|
|
|
|
// Use port if non default.
|
|
$port = isset($parts['port']) &&
|
|
(($protocol === 'http://' && $parts['port'] !== 80) || ($protocol === 'https://' && $parts['port'] !== 443))
|
|
? ':' . $parts['port'] : '';
|
|
|
|
// Rebuild.
|
|
return $protocol . $parts['host'] . $port . $parts['path'] . $query;
|
|
}
|
|
|
|
/**
|
|
* Build the URL for given path and parameters.
|
|
*
|
|
* @param $path
|
|
* (optional) The path.
|
|
* @param $params
|
|
* (optional) The query parameters in associative array.
|
|
*
|
|
* @return
|
|
* The URL for the given parameters.
|
|
*/
|
|
protected function getUri($path = '', $params = array()) {
|
|
$url = $this->getVariable('services_uri') ? $this->getVariable('services_uri') : $this->getVariable('base_uri');
|
|
|
|
if (!empty($path))
|
|
if (substr($path, 0, 4) == "http")
|
|
$url = $path;
|
|
else
|
|
$url = rtrim($url, '/') . '/' . ltrim($path, '/');
|
|
|
|
if (!empty($params))
|
|
$url .= '?' . http_build_query($params, NULL, '&');
|
|
|
|
return $url;
|
|
}
|
|
|
|
/**
|
|
* Generate a signature for the given params and secret.
|
|
*
|
|
* @param $params
|
|
* The parameters to sign.
|
|
* @param $secret
|
|
* The secret to sign with.
|
|
*
|
|
* @return
|
|
* The generated signature
|
|
*/
|
|
protected function generateSignature($params, $secret) {
|
|
// Work with sorted data.
|
|
ksort($params);
|
|
|
|
// Generate the base string.
|
|
$base_string = '';
|
|
foreach ($params as $key => $value) {
|
|
$base_string .= $key . '=' . $value;
|
|
}
|
|
$base_string .= $secret;
|
|
|
|
return md5($base_string);
|
|
}
|
|
}
|