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