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<?php
//ini_set('display_errors', 1);
//error_reporting(E_ALL | E_STRICT);
// Regex to filter out the client identifier
// (described in Section 2 of IETF draft)
// IETF draft does not prescribe a format for these, however
// I've arbitrarily chosen alphanumeric strings with hyphens and underscores, 3-12 characters long
// Feel free to change.
define("REGEX_CLIENT_ID", "/^[a-z0-9-_]{3,12}$/i");
// Used to define the name of the OAuth access token parameter (POST/GET/etc.)
// IETF Draft sections 5.2 and 5.3 specify that it should be called "oauth_token"
// but other implementations use things like "access_token"
// I won't be heartbroken if you change it, but it might be better to adhere to the spec
define("OAUTH_TOKEN_PARAM_NAME", "oauth_token");
// Client types (for client authorization)
//define("WEB_SERVER_CLIENT_TYPE", "web_server");
//define("USER_AGENT_CLIENT_TYPE", "user_agent");
//define("REGEX_CLIENT_TYPE", "/^(web_server|user_agent)$/");
define("ACCESS_TOKEN_AUTH_RESPONSE_TYPE", "token");
define("AUTH_CODE_AUTH_RESPONSE_TYPE", "code");
define("CODE_AND_TOKEN_AUTH_RESPONSE_TYPE", "code-and-token");
define("REGEX_AUTH_RESPONSE_TYPE", "/^(token|code|code-and-token)$/");
// Grant Types (for token obtaining)
define("AUTH_CODE_GRANT_TYPE", "authorization-code");
define("USER_CREDENTIALS_GRANT_TYPE", "basic-credentials");
define("ASSERTION_GRANT_TYPE", "assertion");
define("REFRESH_TOKEN_GRANT_TYPE", "refresh-token");
define("NONE_GRANT_TYPE", "none");
define("REGEX_TOKEN_GRANT_TYPE", "/^(authorization-code|basic-credentials|assertion|refresh-token|none)$/");
/* Error handling constants */
// HTTP status codes
define("ERROR_NOT_FOUND", "404 Not Found");
define("ERROR_BAD_REQUEST", "400 Bad Request");
// TODO: Extend for i18n
// "Official" OAuth 2.0 errors
define("ERROR_REDIRECT_URI_MISMATCH", "redirect-uri-mismatch");
define("ERROR_INVALID_CLIENT_CREDENTIALS", "invalid-client-credentials");
define("ERROR_UNAUTHORIZED_CLIENT", "unauthorized-client");
define("ERROR_USER_DENIED", "access-denied");
define("ERROR_INVALID_REQUEST", "invalid-request");
define("ERROR_INVALID_CLIENT_ID", "invalid-client-id");
define("ERROR_UNSUPPORTED_RESPONSE_TYPE", "unsupported-response-type");
define("ERROR_INVALID_SCOPE", "invalid-scope");
define("ERROR_INVALID_GRANT", "invalid-grant");
// Protected resource errors
define("ERROR_INVALID_TOKEN", "invalid-token");
define("ERROR_EXPIRED_TOKEN", "expired-token");
define("ERROR_INSUFFICIENT_SCOPE", "insufficient-scope");
// Messages
define("ERROR_INVALID_RESPONSE_TYPE", "Invalid response type.");
// Errors that we made up
// Error for trying to use a grant type that we haven't implemented
define("ERROR_UNSUPPORTED_GRANT_TYPE", "unsupported-grant-type");
abstract class OAuth2 {
/* Subclasses must implement the following functions */
// Make sure that the client id is valid
// If a secret is required, check that they've given the right one
// Must return false if the client credentials are invalid
abstract protected function auth_client_credentials($client_id, $client_secret = null);
// OAuth says we should store request URIs for each registered client
// Implement this function to grab the stored URI for a given client id
// Must return false if the given client does not exist or is invalid
abstract protected function get_redirect_uri($client_id);
// We need to store and retrieve access token data as we create and verify tokens
// Implement these functions to do just that
// Look up the supplied token id from storage, and return an array like:
//
// array(
// "client_id" => <stored client id>,
// "expires" => <stored expiration timestamp>,
// "scope" => <stored scope (may be null)
// )
//
// Return null if the supplied token is invalid
//
abstract protected function get_access_token($token_id);
// Store the supplied values
abstract protected function store_access_token($token_id, $client_id, $expires, $scope = null);
/*
*
* Stuff that should get overridden by subclasses
*
* I don't want to make these abstract, because then subclasses would have
* to implement all of them, which is too much work.
*
* So they're just stubs. Override the ones you need.
*
*/
// You should override this function with something,
// or else your OAuth provider won't support any grant types!
protected function get_supported_grant_types() {
// If you support all grant types, then you'd do:
// return array(
// AUTH_CODE_GRANT_TYPE,
// USER_CREDENTIALS_GRANT_TYPE,
// ASSERTION_GRANT_TYPE,
// REFRESH_TOKEN_GRANT_TYPE,
// NONE_GRANT_TYPE
// );
return array();
}
// You should override this function with your supported response types
protected function get_supported_auth_response_types() {
return array(
AUTH_CODE_AUTH_RESPONSE_TYPE,
ACCESS_TOKEN_AUTH_RESPONSE_TYPE,
CODE_AND_TOKEN_AUTH_RESPONSE_TYPE
);
}
// If you want to support scope use, then have this function return a list
// of all acceptable scopes (used to throw the invalid-scope error)
protected function get_supported_scopes() {
// Example:
// return array("my-friends", "photos", "whatever-else");
return array();
}
// If you want to restrict clients to certain authorization response types,
// override this function
// Given a client identifier and auth type, return true or false
// (auth type would be one of the values contained in REGEX_AUTH_RESPONSE_TYPE)
protected function authorize_client_response_type($client_id, $response_type) {
return true;
}
// If you want to restrict clients to certain grant types, override this function
// Given a client identifier and grant type, return true or false
protected function authorize_client($client_id, $grant_type) {
return true;
}
/* Functions that help grant access tokens for various grant types */
// Fetch authorization code data (probably the most common grant type)
// IETF Draft 4.1.1: http://tools.ietf.org/html/draft-ietf-oauth-v2-08#section-4.1.1
// Required for AUTH_CODE_GRANT_TYPE
protected function get_stored_auth_code($code) {
// Retrieve the stored data for the given authorization code
// Should return:
//
// array (
// "client_id" => <stored client id>,
// "redirect_uri" => <stored redirect URI>,
// "expires" => <stored code expiration time>,
// "scope" => <stored scope values (space-separated string), or can be omitted if scope is unused>
// )
//
// Return null if the code is invalid.
return null;
}
// Take the provided authorization code values and store them somewhere (db, etc.)
// Required for AUTH_CODE_GRANT_TYPE
protected function store_auth_code($code, $client_id, $redirect_uri, $expires, $scope) {
// This function should be the storage counterpart to get_stored_auth_code
// If storage fails for some reason, we're not currently checking
// for any sort of success/failure, so you should bail out of the
// script and provide a descriptive fail message
}
// Grant access tokens for basic user credentials
// IETF Draft 4.1.2: http://tools.ietf.org/html/draft-ietf-oauth-v2-08#section-4.1.2
// Required for USER_CREDENTIALS_GRANT_TYPE
protected function check_user_credentials($client_id, $username, $password) {
// Check the supplied username and password for validity
// You can also use the $client_id param to do any checks required
// based on a client, if you need that
// If the username and password are invalid, return false
// If the username and password are valid, and you want to verify the scope of
// a user's access, return an array with the scope values, like so:
//
// array (
// "scope" => <stored scope values (space-separated string)>
// )
//
// We'll check the scope you provide against the requested scope before
// providing an access token.
//
// Otherwise, just return true.
return false;
}
// Grant access tokens for assertions
// IETF Draft 4.1.3: http://tools.ietf.org/html/draft-ietf-oauth-v2-08#section-4.1.3
// Required for ASSERTION_GRANT_TYPE
protected function check_assertion($client_id, $assertion_type, $assertion) {
// Check the supplied assertion for validity
// You can also use the $client_id param to do any checks required
// based on a client, if you need that
// If the assertion is invalid, return false
// If the assertion is valid, and you want to verify the scope of
// an access request, return an array with the scope values, like so:
//
// array (
// "scope" => <stored scope values (space-separated string)>
// )
//
// We'll check the scope you provide against the requested scope before
// providing an access token.
//
// Otherwise, just return true.
return false;
}
// Grant refresh access tokens
// IETF Draft 4.1.4: http://tools.ietf.org/html/draft-ietf-oauth-v2-08#section-4.1.4
// Required for REFRESH_TOKEN_GRANT_TYPE
protected function get_refresh_token($refresh_token) {
// Retrieve the stored data for the given refresh token
// Should return:
//
// array (
// "client_id" => <stored client id>,
// "expires" => <refresh token expiration time>,
// "scope" => <stored scope values (space-separated string), or can be omitted if scope is unused>
// )
//
// Return null if the token id is invalid.
return null;
}
// Store refresh access tokens
// Required for REFRESH_TOKEN_GRANT_TYPE
protected function store_refresh_token($token, $client_id, $expires, $scope = null) {
// If storage fails for some reason, we're not currently checking
// for any sort of success/failure, so you should bail out of the
// script and provide a descriptive fail message
return;
}
// Grant access tokens for the "none" grant type
// Not really described in the IETF Draft, so I just left a method stub...do whatever you want!
// Required for NONE_GRANT_TYPE
protected function check_none_access($client_id) {
return false;
}
protected function get_default_authentication_realm() {
// Change this to whatever authentication realm you want to send in a WWW-Authenticate header
return "Service";
}
/* End stuff that should get overridden */
private $access_token_lifetime = 3600;
private $auth_code_lifetime = 30;
private $refresh_token_lifetime = 1209600; // Two weeks
public function __construct($access_token_lifetime = 3600, $auth_code_lifetime = 30, $refresh_token_lifetime = 1209600) {
$this->access_token_lifetime = $access_token_lifetime;
$this->auth_code_lifetime = $auth_code_lifetime;
$this->refresh_token_lifetime = $refresh_token_lifetime;
}
/* Resource protecting (Section 5) */
// Check that a valid access token has been provided
//
// The scope parameter defines any required scope that the token must have
// If a scope param is provided and the token does not have the required scope,
// we bounce the request
//
// Some implementations may choose to return a subset of the protected resource
// (i.e. "public" data) if the user has not provided an access token
// or if the access token is invalid or expired
//
// The IETF spec says that we should send a 401 Unauthorized header and bail immediately
// so that's what the defaults are set to
//
// Here's what each parameter does:
// $scope = A space-separated string of required scope(s), if you want to check for scope
// $exit_not_present = If true and no access token is provided, send a 401 header and exit, otherwise return false
// $exit_invalid = If true and the implementation of get_access_token returns null, exit, otherwise return false
// $exit_expired = If true and the access token has expired, exit, otherwise return false
// $exit_scope = If true the access token does not have the required scope(s), exit, otherwise return false
// $realm = If you want to specify a particular realm for the WWW-Authenticate header, supply it here
public function verify_access_token($scope = null, $exit_not_present = true, $exit_invalid = true, $exit_expired = true, $exit_scope = true, $realm = null) {
$token_param = $this->get_access_token_param();
if ($token_param === false) // Access token was not provided
return $exit_not_present ? $this->send_401_unauthorized($realm, $scope) : false;
// Get the stored token data (from the implementing subclass)
$token = $this->get_access_token($token_param);
if ($token === null)
return $exit_invalid ? $this->send_401_unauthorized($realm, $scope, ERROR_INVALID_TOKEN) : false;
// Check token expiration (I'm leaving this check separated, later we'll fill in better error messages)
if (isset($token["expires"]) && time() > $token["expires"])
return $exit_expired ? $this->send_401_unauthorized($realm, $scope, ERROR_EXPIRED_TOKEN) : false;
// Check scope, if provided
// If token doesn't have a scope, it's null/empty, or it's insufficient, then throw an error
if ($scope &&
(!isset($token["scope"]) || !$token["scope"] || !$this->check_scope($scope, $token["scope"])))
return $exit_scope ? $this->send_401_unauthorized($realm, $scope, ERROR_INSUFFICIENT_SCOPE) : false;
return true;
}
// Returns true if everything in required scope is contained in available scope
// False if something in required scope is not in available scope
private function check_scope($required_scope, $available_scope) {
// The required scope should match or be a subset of the available scope
if (!is_array($required_scope))
$required_scope = explode(" ", $required_scope);
if (!is_array($available_scope))
$available_scope = explode(" ", $available_scope);
return (count(array_diff($required_scope, $available_scope)) == 0);
}
// Send a 401 unauthorized header with the given realm
// and an error, if provided
private function send_401_unauthorized($realm, $scope, $error = null) {
$realm = $realm === null ? $this->get_default_authentication_realm() : $realm;
$auth_header = "WWW-Authenticate: Token realm='".$realm."'";
if ($scope)
$auth_header .= ", scope='".$scope."'";
if ($error !== null)
$auth_header .= ", error='".$error."'";
header("HTTP/1.1 401 Unauthorized");
header($auth_header);
exit;
}
// Pulls the access token out of the HTTP request
// Either from the Authorization header or GET/POST/etc.
// Returns false if no token is present
// TODO: Support POST or DELETE
private function get_access_token_param() {
$auth_header = $this->get_authorization_header();
if ($auth_header !== false) {
// Make sure only the auth header is set
if (isset($_GET[OAUTH_TOKEN_PARAM_NAME]) || isset($_POST[OAUTH_TOKEN_PARAM_NAME]))
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
$auth_header = trim($auth_header);
// Make sure it's Token authorization
if (strcmp(substr($auth_header, 0, 6),"Token ") !== 0)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
// Parse the rest of the header
if (preg_match('/\s*token\s*="(.+)"/', substr($auth_header, 6), $matches) == 0 || count($matches) < 2)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
return $matches[1];
}
if (isset($_GET[OAUTH_TOKEN_PARAM_NAME])) {
if (isset($_POST[OAUTH_TOKEN_PARAM_NAME])) // Both GET and POST are not allowed
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
return $_GET[OAUTH_TOKEN_PARAM_NAME];
}
if (isset($_POST[OAUTH_TOKEN_PARAM_NAME]))
return $_POST[OAUTH_TOKEN_PARAM_NAME];
return false;
}
/* Access token granting (Section 4) */
// Grant or deny a requested access token
// This would be called from the "/token" endpoint as defined in the spec
// Obviously, you can call your endpoint whatever you want
public function grant_access_token() {
$filters = array(
"grant_type" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => REGEX_TOKEN_GRANT_TYPE), "flags" => FILTER_REQUIRE_SCALAR),
"scope" => array("flags" => FILTER_REQUIRE_SCALAR),
"code" => array("flags" => FILTER_REQUIRE_SCALAR),
"redirect_uri" => array("filter" => FILTER_VALIDATE_URL, "flags" => array(FILTER_FLAG_SCHEME_REQUIRED, FILTER_REQUIRE_SCALAR)),
"username" => array("flags" => FILTER_REQUIRE_SCALAR),
"password" => array("flags" => FILTER_REQUIRE_SCALAR),
"assertion_type" => array("flags" => FILTER_REQUIRE_SCALAR),
"assertion" => array("flags" => FILTER_REQUIRE_SCALAR),
"refresh_token" => array("flags" => FILTER_REQUIRE_SCALAR),
);
$input = filter_input_array(INPUT_POST, $filters);
// Grant Type must be specified.
if (!$input["grant_type"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
// Make sure we've implemented the requested grant type
if (!in_array($input["grant_type"], $this->get_supported_grant_types()))
$this->error(ERROR_BAD_REQUEST, ERROR_UNSUPPORTED_GRANT_TYPE);
// Authorize the client
$client = $this->get_client_credentials();
if ($this->auth_client_credentials($client[0], $client[1]) === false)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_CLIENT_CREDENTIALS);
if (!$this->authorize_client($client[0], $input["grant_type"]))
$this->error(ERROR_BAD_REQUEST, ERROR_UNAUTHORIZED_CLIENT);
// Do the granting
switch ($input["grant_type"]) {
case AUTH_CODE_GRANT_TYPE:
if (!$input["code"] || !$input["redirect_uri"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
$stored = $this->get_stored_auth_code($input["code"]);
if ($stored === null || $input["redirect_uri"] != $stored["redirect_uri"] || $client[0] != $stored["client_id"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
if ($stored["expires"] > time())
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
break;
case USER_CREDENTIALS_GRANT_TYPE:
if (!$input["username"] || !$input["password"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
$stored = $this->check_user_credentials($client[0], $input["username"], $input["password"]);
if ($stored === false)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
break;
case ASSERTION_GRANT_TYPE:
if (!$input["assertion_type"] || !$input["assertion"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
$stored = $this->check_assertion($client[0], $input["assertion_type"], $input["assertion"]);
if ($stored === false)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
break;
case REFRESH_TOKEN_GRANT_TYPE:
if (!$input["refresh_token"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
$stored = $this->get_refresh_token($input["refresh_token"]);
if ($stored === null || $client[0] != $stored["client_id"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
if ($stored["expires"] > time())
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_GRANT);
break;
case NONE_GRANT_TYPE:
$stored = $this->check_none_access($client[0]);
if ($stored === false)
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
}
// Check scope, if provided
if ($input["scope"] && (!is_array($stored) || !isset($stored["scope"]) || !$this->check_scope($input["scope"], $stored["scope"])))
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_SCOPE);
if (!$input["scope"])
$input["scope"] = null;
$token = $this->create_access_token($client[0], $input["scope"]);
$this->send_json_headers();
echo json_encode($token);
}
// Internal function used to get the client credentials from HTTP basic auth or POST data
// See http://tools.ietf.org/html/draft-ietf-oauth-v2-08#section-2
private function get_client_credentials() {
if (isset($_SERVER["PHP_AUTH_USER"]) && $_POST && isset($_POST["client_id"]))
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_CLIENT_CREDENTIALS);
// Try basic auth
if (isset($_SERVER["PHP_AUTH_USER"]))
return array($_SERVER["PHP_AUTH_USER"], $_SERVER["PHP_AUTH_PW"]);
// Try POST
if ($_POST && isset($_POST["client_id"])) {
if (isset($_POST["client_secret"]))
return array($_POST["client_id"], $_POST["client_secret"]);
return array($_POST["client_id"], NULL);
}
// No credentials were specified
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_CLIENT_CREDENTIALS);
}
/* End-user/client Authorization (Section 3 of IETF Draft) */
// Pull the authorization request data out of the HTTP request
// and return it so the authorization server can prompt the user
// for approval
public function get_authorize_params() {
$filters = array(
"client_id" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => REGEX_CLIENT_ID), "flags" => FILTER_REQUIRE_SCALAR),
"response_type" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => REGEX_AUTH_RESPONSE_TYPE), "flags" => FILTER_REQUIRE_SCALAR),
"redirect_uri" => array("filter" => FILTER_VALIDATE_URL, "flags" => array(FILTER_FLAG_SCHEME_REQUIRED, FILTER_REQUIRE_SCALAR)),
"state" => array("flags" => FILTER_REQUIRE_SCALAR),
"scope" => array("flags" => FILTER_REQUIRE_SCALAR),
);
$input = filter_input_array(INPUT_GET, $filters);
// Make sure a valid client id was supplied
if (!$input["client_id"]) {
if ($input["redirect_uri"])
$this->callback_error($input["redirect_uri"], ERROR_INVALID_CLIENT_ID, $input["state"]);
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_CLIENT_ID); // We don't have a good URI to use
}
// redirect_uri is not required if already established via other channels
// check an existing redirect URI against the one supplied
$redirect_uri = $this->get_redirect_uri($input["client_id"]);
// At least one of: existing redirect URI or input redirect URI must be specified
if (!$redirect_uri && !$input["redirect_uri"])
$this->error(ERROR_BAD_REQUEST, ERROR_INVALID_REQUEST);
// get_redirect_uri should return false if the given client ID is invalid
// this probably saves us from making a separate db call, and simplifies the method set
if ($redirect_uri === false)
$this->callback_error($input["redirect_uri"], ERROR_INVALID_CLIENT_ID, $input["state"]);
// If there's an existing uri and one from input, verify that they match
if ($redirect_uri && $input["redirect_uri"]) {
// Ensure that the input uri starts with the stored uri
if (strcasecmp(substr($input["redirect_uri"], 0, strlen($redirect_uri)),$redirect_uri) !== 0)
$this->callback_error($input["redirect_uri"], ERROR_REDIRECT_URI_MISMATCH, $input["state"]);
} elseif ($redirect_uri) { // They did not provide a uri from input, so use the stored one
$input["redirect_uri"] = $redirect_uri;
}
// type and client_id are required
if (!$input["response_type"])
$this->callback_error($input["redirect_uri"], ERROR_INVALID_REQUEST, $input["state"], ERROR_INVALID_RESPONSE_TYPE);
// Check requested auth response type against the list of supported types
if (array_search($input["response_type"], $this->get_supported_auth_response_types()) === false)
$this->callback_error($input["redirect_uri"], ERROR_UNSUPPORTED_RESPONSE_TYPE, $input["state"]);
// Validate that the requested scope is supported
if ($input["scope"] && !$this->check_scope($input["scope"], $this->get_supported_scopes()))
$this->callback_error($input["redirect_uri"], ERROR_INVALID_SCOPE, $input["state"]);
return $input;
}
// After the user has approved or denied the access request
// the authorization server should call this function to redirect
// the user appropriately
// The params all come from the results of get_authorize_params
// except for $is_authorized -- this is true or false depending on whether
// the user authorized the access
public function finish_client_authorization($is_authorized, $type, $client_id, $redirect_uri, $state, $scope = null) {
if ($state !== null)
$result["query"]["state"] = $state;
if ($is_authorized === false) {
$result["query"]["error"] = ERROR_USER_DENIED;
} else {
if ($type == AUTH_CODE_AUTH_RESPONSE_TYPE || $type == CODE_AND_TOKEN_AUTH_RESPONSE_TYPE)
$result["query"]["code"] = $this->create_auth_code($client_id, $redirect_uri, $scope);
if ($type == ACCESS_TOKEN_AUTH_RESPONSE_TYPE || $type == CODE_AND_TOKEN_AUTH_RESPONSE_TYPE)
$result["fragment"] = $this->create_access_token($client_id, $scope);
}
$this->do_redirect_uri_callback($redirect_uri, $result);
}
/* Other/utility functions */
private function do_redirect_uri_callback($redirect_uri, $result) {
header("HTTP/1.1 302 Found");
header("Location: " . $this->build_uri($redirect_uri, $result));
exit;
}
private function build_uri($uri, $data) {
$parse_url = parse_url($uri);
// Add our data to the parsed uri
foreach ($data as $k => $v) {
if (isset($parse_url[$k]))
$parse_url[$k] .= "&" . http_build_query($v);
else
$parse_url[$k] = http_build_query($v);
}
// Put humpty dumpty back together
return
((isset($parse_url["scheme"])) ? $parse_url["scheme"] . "://" : "")
.((isset($parse_url["user"])) ? $parse_url["user"] . ((isset($parse_url["pass"])) ? ":" . $parse_url["pass"] : "") ."@" : "")
.((isset($parse_url["host"])) ? $parse_url["host"] : "")
.((isset($parse_url["port"])) ? ":" . $parse_url["port"] : "")
.((isset($parse_url["path"])) ? $parse_url["path"] : "")
.((isset($parse_url["query"])) ? "?" . $parse_url["query"] : "")
.((isset($parse_url["fragment"])) ? "#" . $parse_url["fragment"] : "");
}
// This belongs in a separate factory, but to keep it simple, I'm just keeping it here.
private function create_access_token($client_id, $scope) {
$token = array(
"access_token" => $this->gen_access_token(),
"expires_in" => $this->access_token_lifetime,
"scope" => $scope
);
$this->store_access_token($token["access_token"], $client_id, time() + $this->access_token_lifetime, $scope);
// Issue a refresh token also, if we support them
if (in_array(REFRESH_TOKEN_GRANT_TYPE, $this->get_supported_grant_types())) {
$token["refresh_token"] = $this->gen_access_token();
$this->store_refresh_token($token["refresh_token"], $client_id, time() + $this->refresh_token_lifetime, $scope);
}
return $token;
}
private function create_auth_code($client_id, $redirect_uri, $scope) {
$code = $this->gen_auth_code();
$this->store_auth_code($code, $client_id, $redirect_uri, time() + $this->auth_code_lifetime, $scope);
return $code;
}
// Implementing classes may want to override these two functions
// to implement other access token or auth code generation schemes
private function gen_access_token() {
return base64_encode(pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand()));
}
private function gen_auth_code() {
return base64_encode(pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand()));
}
// Implementing classes may need to override this function for use on non-Apache web servers
// Just pull out the Authorization HTTP header and return it
// Return false if the Authorization header does not exist
private function get_authorization_header() {
if (array_key_exists("HTTP_AUTHORIZATION", $_SERVER))
return $_SERVER["HTTP_AUTHORIZATION"];
if (function_exists("apache_request_headers")) {
$headers = apache_request_headers();
if (array_key_exists("Authorization", $headers))
return $headers["Authorization"];
}
return false;
}
private function send_json_headers() {
header("Content-Type: application/json");
header("Cache-Control: no-store");
}
public function error($code, $message = null) {
header("HTTP/1.1 " . $code);
if ($message) {
$this->send_json_headers();
echo json_encode(array("error" => $message));
}
exit;
}
public function callback_error($redirect_uri, $error, $state, $message = null, $error_uri = null) {
$result["query"]["error"] = $error;
if ($state)
$result["query"]["state"] = $state;
if ($message)
$result["query"]["error_description"] = $message;
if ($error_uri)
$result["query"]["error_uri"] = $error_uri;
$this->do_redirect_uri_callback($redirect_uri, $result);
}
}