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Diffstat (limited to 'library/oauth2-php/lib/OAuth2.inc')
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diff --git a/library/oauth2-php/lib/OAuth2.inc b/library/oauth2-php/lib/OAuth2.inc new file mode 100644 index 000000000..e10e0f26d --- /dev/null +++ b/library/oauth2-php/lib/OAuth2.inc @@ -0,0 +1,1560 @@ +<?php + +/** + * @mainpage + * OAuth 2.0 server in PHP, originally written for + * <a href="http://www.opendining.net/"> Open Dining</a>. Supports + * <a href="http://tools.ietf.org/html/draft-ietf-oauth-v2-10">IETF draft v10</a>. + * + * Source repo has sample servers implementations for + * <a href="http://php.net/manual/en/book.pdo.php"> PHP Data Objects</a> and + * <a href="http://www.mongodb.org/">MongoDB</a>. Easily adaptable to other + * storage engines. + * + * PHP Data Objects supports a variety of databases, including MySQL, + * Microsoft SQL Server, SQLite, and Oracle, so you can try out the sample + * to see how it all works. + * + * We're expanding the wiki to include more helpful documentation, but for + * now, your best bet is to view the oauth.php source - it has lots of + * comments. + * + * @author Tim Ridgely <tim.ridgely@gmail.com> + * @author Aaron Parecki <aaron@parecki.com> + * @author Edison Wong <hswong3i@pantarei-design.com> + * + * @see http://code.google.com/p/oauth2-php/ + */ + + +/** + * The default duration in seconds of the access token lifetime. + */ +define("OAUTH2_DEFAULT_ACCESS_TOKEN_LIFETIME", 3600); + +/** + * The default duration in seconds of the authorization code lifetime. + */ +define("OAUTH2_DEFAULT_AUTH_CODE_LIFETIME", 30); + +/** + * The default duration in seconds of the refresh token lifetime. + */ +define("OAUTH2_DEFAULT_REFRESH_TOKEN_LIFETIME", 1209600); + + +/** + * @defgroup oauth2_section_2 Client Credentials + * @{ + * + * When interacting with the authorization server, the client identifies + * itself using a client identifier and authenticates using a set of + * client credentials. This specification provides one mechanism for + * authenticating the client using password credentials. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-2 + */ + +/** + * 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, 3-32 characters + * long. + * + * Feel free to change. + */ +define("OAUTH2_CLIENT_ID_REGEXP", "/^[a-z0-9-_]{3,32}$/i"); + +/** + * @} + */ + + +/** + * @defgroup oauth2_section_3 Obtaining End-User Authorization + * @{ + * + * When the client interacts with an end-user, the end-user MUST first + * grant the client authorization to access its protected resources. + * Once obtained, the end-user access grant is expressed as an + * authorization code which the client uses to obtain an access token. + * To obtain an end-user authorization, the client sends the end-user to + * the end-user authorization endpoint. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3 + */ + +/** + * Denotes "token" authorization response type. + */ +define("OAUTH2_AUTH_RESPONSE_TYPE_ACCESS_TOKEN", "token"); + +/** + * Denotes "code" authorization response type. + */ +define("OAUTH2_AUTH_RESPONSE_TYPE_AUTH_CODE", "code"); + +/** + * Denotes "code-and-token" authorization response type. + */ +define("OAUTH2_AUTH_RESPONSE_TYPE_CODE_AND_TOKEN", "code-and-token"); + +/** + * Regex to filter out the authorization response type. + */ +define("OAUTH2_AUTH_RESPONSE_TYPE_REGEXP", "/^(token|code|code-and-token)$/"); + +/** + * @} + */ + + +/** + * @defgroup oauth2_section_4 Obtaining an Access Token + * @{ + * + * The client obtains an access token by authenticating with the + * authorization server and presenting its access grant (in the form of + * an authorization code, resource owner credentials, an assertion, or a + * refresh token). + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4 + */ + +/** + * Denotes "authorization_code" grant types (for token obtaining). + */ +define("OAUTH2_GRANT_TYPE_AUTH_CODE", "authorization_code"); + +/** + * Denotes "password" grant types (for token obtaining). + */ +define("OAUTH2_GRANT_TYPE_USER_CREDENTIALS", "password"); + +/** + * Denotes "assertion" grant types (for token obtaining). + */ +define("OAUTH2_GRANT_TYPE_ASSERTION", "assertion"); + +/** + * Denotes "refresh_token" grant types (for token obtaining). + */ +define("OAUTH2_GRANT_TYPE_REFRESH_TOKEN", "refresh_token"); + +/** + * Denotes "none" grant types (for token obtaining). + */ +define("OAUTH2_GRANT_TYPE_NONE", "none"); + +/** + * Regex to filter out the grant type. + */ +define("OAUTH2_GRANT_TYPE_REGEXP", "/^(authorization_code|password|assertion|refresh_token|none)$/"); + +/** + * @} + */ + + +/** + * @defgroup oauth2_section_5 Accessing a Protected Resource + * @{ + * + * Clients access protected resources by presenting an access token to + * the resource server. Access tokens act as bearer tokens, where the + * token string acts as a shared symmetric secret. This requires + * treating the access token with the same care as other secrets (e.g. + * end-user passwords). Access tokens SHOULD NOT be sent in the clear + * over an insecure channel. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5 + */ + +/** + * Used to define the name of the OAuth access token parameter (POST/GET/etc.). + * + * IETF Draft sections 5.1.2 and 5.1.3 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. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.1.2 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.1.3 + */ +define("OAUTH2_TOKEN_PARAM_NAME", "oauth_token"); + +/** + * @} + */ + + +/** + * @defgroup oauth2_http_status HTTP status code + * @{ + */ + +/** + * "Found" HTTP status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3 + */ +define("OAUTH2_HTTP_FOUND", "302 Found"); + +/** + * "Bad Request" HTTP status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_HTTP_BAD_REQUEST", "400 Bad Request"); + +/** + * "Unauthorized" HTTP status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_HTTP_UNAUTHORIZED", "401 Unauthorized"); + +/** + * "Forbidden" HTTP status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_HTTP_FORBIDDEN", "403 Forbidden"); + +/** + * @} + */ + + +/** + * @defgroup oauth2_error Error handling + * @{ + * + * @todo Extend for i18n. + */ + +/** + * The request is missing a required parameter, includes an unsupported + * parameter or parameter value, or is otherwise malformed. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_ERROR_INVALID_REQUEST", "invalid_request"); + +/** + * The client identifier provided is invalid. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + */ +define("OAUTH2_ERROR_INVALID_CLIENT", "invalid_client"); + +/** + * The client is not authorized to use the requested response type. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + */ +define("OAUTH2_ERROR_UNAUTHORIZED_CLIENT", "unauthorized_client"); + +/** + * The redirection URI provided does not match a pre-registered value. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + */ +define("OAUTH2_ERROR_REDIRECT_URI_MISMATCH", "redirect_uri_mismatch"); + +/** + * The end-user or authorization server denied the request. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + */ +define("OAUTH2_ERROR_USER_DENIED", "access_denied"); + +/** + * The requested response type is not supported by the authorization server. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + */ +define("OAUTH2_ERROR_UNSUPPORTED_RESPONSE_TYPE", "unsupported_response_type"); + +/** + * The requested scope is invalid, unknown, or malformed. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2.1 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + */ +define("OAUTH2_ERROR_INVALID_SCOPE", "invalid_scope"); + +/** + * The provided access grant is invalid, expired, or revoked (e.g. invalid + * assertion, expired authorization token, bad end-user password credentials, + * or mismatching authorization code and redirection URI). + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + */ +define("OAUTH2_ERROR_INVALID_GRANT", "invalid_grant"); + +/** + * The access grant included - its type or another attribute - is not + * supported by the authorization server. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3.1 + */ +define("OAUTH2_ERROR_UNSUPPORTED_GRANT_TYPE", "unsupported_grant_type"); + +/** + * The access token provided is invalid. Resource servers SHOULD use this + * error code when receiving an expired token which cannot be refreshed to + * indicate to the client that a new authorization is necessary. The resource + * server MUST respond with the HTTP 401 (Unauthorized) status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_ERROR_INVALID_TOKEN", "invalid_token"); + +/** + * The access token provided has expired. Resource servers SHOULD only use + * this error code when the client is expected to be able to handle the + * response and request a new access token using the refresh token issued + * with the expired access token. The resource server MUST respond with the + * HTTP 401 (Unauthorized) status code. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_ERROR_EXPIRED_TOKEN", "expired_token"); + +/** + * The request requires higher privileges than provided by the access token. + * The resource server SHOULD respond with the HTTP 403 (Forbidden) status + * code and MAY include the "scope" attribute with the scope necessary to + * access the protected resource. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1 + */ +define("OAUTH2_ERROR_INSUFFICIENT_SCOPE", "insufficient_scope"); + +/** + * @} + */ + +/** + * OAuth2.0 draft v10 server-side implementation. + * + * @author Originally written by Tim Ridgely <tim.ridgely@gmail.com>. + * @author Updated to draft v10 by Aaron Parecki <aaron@parecki.com>. + * @author Debug, coding style clean up and documented by Edison Wong <hswong3i@pantarei-design.com>. + */ +abstract class OAuth2 { + + /** + * 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; + } + + // Subclasses must implement the following functions. + + /** + * Make sure that the client credentials is valid. + * + * @param $client_id + * Client identifier to be check with. + * @param $client_secret + * (optional) If a secret is required, check that they've given the right one. + * + * @return + * TRUE if client credentials are valid, and MUST return FALSE if invalid. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-2.1 + * + * @ingroup oauth2_section_2 + */ + abstract protected function checkClientCredentials($client_id, $client_secret = NULL); + + /** + * Get the registered redirect URI of corresponding client_id. + * + * OAuth says we should store request URIs for each registered client. + * Implement this function to grab the stored URI for a given client id. + * + * @param $client_id + * Client identifier to be check with. + * + * @return + * Registered redirect URI of corresponding client identifier, and MUST + * return FALSE if the given client does not exist or is invalid. + * + * @ingroup oauth2_section_3 + */ + abstract protected function getRedirectUri($client_id); + + /** + * Look up the supplied oauth_token from storage. + * + * We need to retrieve access token data as we create and verify tokens. + * + * @param $oauth_token + * oauth_token to be check with. + * + * @return + * An associative array as below, and return NULL if the supplied oauth_token + * is invalid: + * - client_id: Stored client identifier. + * - expires: Stored expiration in unix timestamp. + * - scope: (optional) Stored scope values in space-separated string. + * + * @ingroup oauth2_section_5 + */ + abstract protected function getAccessToken($oauth_token); + + /** + * Store the supplied access token values to storage. + * + * We need to store access token data as we create and verify tokens. + * + * @param $oauth_token + * oauth_token to be stored. + * @param $client_id + * Client identifier to be stored. + * @param $expires + * Expiration to be stored. + * @param $scope + * (optional) Scopes to be stored in space-separated string. + * + * @ingroup oauth2_section_4 + */ + abstract protected function setAccessToken($oauth_token, $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. + + /** + * Return supported grant types. + * + * You should override this function with something, or else your OAuth + * provider won't support any grant types! + * + * @return + * A list as below. If you support all grant types, then you'd do: + * @code + * return array( + * OAUTH2_GRANT_TYPE_AUTH_CODE, + * OAUTH2_GRANT_TYPE_USER_CREDENTIALS, + * OAUTH2_GRANT_TYPE_ASSERTION, + * OAUTH2_GRANT_TYPE_REFRESH_TOKEN, + * OAUTH2_GRANT_TYPE_NONE, + * ); + * @endcode + * + * @ingroup oauth2_section_4 + */ + protected function getSupportedGrantTypes() { + return array(); + } + + /** + * Return supported authorization response types. + * + * You should override this function with your supported response types. + * + * @return + * A list as below. If you support all authorization response types, + * then you'd do: + * @code + * return array( + * OAUTH2_AUTH_RESPONSE_TYPE_AUTH_CODE, + * OAUTH2_AUTH_RESPONSE_TYPE_ACCESS_TOKEN, + * OAUTH2_AUTH_RESPONSE_TYPE_CODE_AND_TOKEN, + * ); + * @endcode + * + * @ingroup oauth2_section_3 + */ + protected function getSupportedAuthResponseTypes() { + return array( + OAUTH2_AUTH_RESPONSE_TYPE_AUTH_CODE, + OAUTH2_AUTH_RESPONSE_TYPE_ACCESS_TOKEN, + OAUTH2_AUTH_RESPONSE_TYPE_CODE_AND_TOKEN + ); + } + + /** + * Return supported scopes. + * + * 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). + * + * @return + * A list as below, for example: + * @code + * return array( + * 'my-friends', + * 'photos', + * 'whatever-else', + * ); + * @endcode + * + * @ingroup oauth2_section_3 + */ + protected function getSupportedScopes() { + return array(); + } + + /** + * Check restricted authorization response types of corresponding Client + * identifier. + * + * If you want to restrict clients to certain authorization response types, + * override this function. + * + * @param $client_id + * Client identifier to be check with. + * @param $response_type + * Authorization response type to be check with, would be one of the + * values contained in OAUTH2_AUTH_RESPONSE_TYPE_REGEXP. + * + * @return + * TRUE if the authorization response type is supported by this + * client identifier, and FALSE if it isn't. + * + * @ingroup oauth2_section_3 + */ + protected function checkRestrictedAuthResponseType($client_id, $response_type) { + return TRUE; + } + + /** + * Check restricted grant types of corresponding client identifier. + * + * If you want to restrict clients to certain grant types, override this + * function. + * + * @param $client_id + * Client identifier to be check with. + * @param $grant_type + * Grant type to be check with, would be one of the values contained in + * OAUTH2_GRANT_TYPE_REGEXP. + * + * @return + * TRUE if the grant type is supported by this client identifier, and + * FALSE if it isn't. + * + * @ingroup oauth2_section_4 + */ + protected function checkRestrictedGrantType($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). + * + * Retrieve the stored data for the given authorization code. + * + * Required for OAUTH2_GRANT_TYPE_AUTH_CODE. + * + * @param $code + * Authorization code to be check with. + * + * @return + * An associative array as below, and NULL if the code is invalid: + * - client_id: Stored client identifier. + * - redirect_uri: Stored redirect URI. + * - expires: Stored expiration in unix timestamp. + * - scope: (optional) Stored scope values in space-separated string. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.1.1 + * + * @ingroup oauth2_section_4 + */ + protected function getAuthCode($code) { + return NULL; + } + + /** + * Take the provided authorization code values and store them somewhere. + * + * This function should be the storage counterpart to getAuthCode(). + * + * 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. + * + * Required for OAUTH2_GRANT_TYPE_AUTH_CODE. + * + * @param $code + * Authorization code to be stored. + * @param $client_id + * Client identifier to be stored. + * @param $redirect_uri + * Redirect URI to be stored. + * @param $expires + * Expiration to be stored. + * @param $scope + * (optional) Scopes to be stored in space-separated string. + * + * @ingroup oauth2_section_4 + */ + protected function setAuthCode($code, $client_id, $redirect_uri, $expires, $scope = NULL) { + } + + /** + * Grant access tokens for basic user credentials. + * + * 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. + * + * Required for OAUTH2_GRANT_TYPE_USER_CREDENTIALS. + * + * @param $client_id + * Client identifier to be check with. + * @param $username + * Username to be check with. + * @param $password + * Password to be check with. + * + * @return + * TRUE if the username and password are valid, and FALSE if it isn't. + * Moreover, if the username and password are valid, and you want to + * verify the scope of a user's access, return an associative array + * with the scope values as below. We'll check the scope you provide + * against the requested scope before providing an access token: + * @code + * return array( + * 'scope' => <stored scope values (space-separated string)>, + * ); + * @endcode + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.1.2 + * + * @ingroup oauth2_section_4 + */ + protected function checkUserCredentials($client_id, $username, $password) { + return FALSE; + } + + /** + * Grant access tokens for assertions. + * + * 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. + * + * Required for OAUTH2_GRANT_TYPE_ASSERTION. + * + * @param $client_id + * Client identifier to be check with. + * @param $assertion_type + * The format of the assertion as defined by the authorization server. + * @param $assertion + * The assertion. + * + * @return + * TRUE if the assertion is valid, and FALSE if it isn't. Moreover, if + * the assertion is valid, and you want to verify the scope of an access + * request, return an associative array with the scope values as below. + * We'll check the scope you provide against the requested scope before + * providing an access token: + * @code + * return array( + * 'scope' => <stored scope values (space-separated string)>, + * ); + * @endcode + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.1.3 + * + * @ingroup oauth2_section_4 + */ + protected function checkAssertion($client_id, $assertion_type, $assertion) { + return FALSE; + } + + /** + * Grant refresh access tokens. + * + * Retrieve the stored data for the given refresh token. + * + * Required for OAUTH2_GRANT_TYPE_REFRESH_TOKEN. + * + * @param $refresh_token + * Refresh token to be check with. + * + * @return + * An associative array as below, and NULL if the refresh_token is + * invalid: + * - client_id: Stored client identifier. + * - expires: Stored expiration unix timestamp. + * - scope: (optional) Stored scope values in space-separated string. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.1.4 + * + * @ingroup oauth2_section_4 + */ + protected function getRefreshToken($refresh_token) { + return NULL; + } + + /** + * Take the provided refresh token values and store them somewhere. + * + * This function should be the storage counterpart to getRefreshToken(). + * + * 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. + * + * Required for OAUTH2_GRANT_TYPE_REFRESH_TOKEN. + * + * @param $refresh_token + * Refresh token to be stored. + * @param $client_id + * Client identifier to be stored. + * @param $expires + * expires to be stored. + * @param $scope + * (optional) Scopes to be stored in space-separated string. + * + * @ingroup oauth2_section_4 + */ + protected function setRefreshToken($refresh_token, $client_id, $expires, $scope = NULL) { + return; + } + + /** + * Expire a used refresh token. + * + * This is not explicitly required in the spec, but is almost implied. + * After granting a new refresh token, the old one is no longer useful and + * so should be forcibly expired in the data store so it can't be used again. + * + * 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. + * + * @param $refresh_token + * Refresh token to be expirse. + * + * @ingroup oauth2_section_4 + */ + protected function unsetRefreshToken($refresh_token) { + 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 OAUTH2_GRANT_TYPE_NONE. + * + * @ingroup oauth2_section_4 + */ + protected function checkNoneAccess($client_id) { + return FALSE; + } + + /** + * Get default authentication realm for WWW-Authenticate header. + * + * Change this to whatever authentication realm you want to send in a + * WWW-Authenticate header. + * + * @return + * A string that you want to send in a WWW-Authenticate header. + * + * @ingroup oauth2_error + */ + protected function getDefaultAuthenticationRealm() { + return "Service"; + } + + // End stuff that should get overridden. + + /** + * Creates an OAuth2.0 server-side instance. + * + * @param $config + * An associative array as below: + * - access_token_lifetime: (optional) The lifetime of access token in + * seconds. + * - auth_code_lifetime: (optional) The lifetime of authorization code in + * seconds. + * - refresh_token_lifetime: (optional) The lifetime of refresh token in + * seconds. + * - display_error: (optional) Whether to show verbose error messages in + * the response. + */ + public function __construct($config = array()) { + foreach ($config as $name => $value) { + $this->setVariable($name, $value); + } + } + + // 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. + * + * @param $scope + * A space-separated string of required scope(s), if you want to check + * for scope. + * @param $exit_not_present + * If TRUE and no access token is provided, send a 401 header and exit, + * otherwise return FALSE. + * @param $exit_invalid + * If TRUE and the implementation of getAccessToken() returns NULL, exit, + * otherwise return FALSE. + * @param $exit_expired + * If TRUE and the access token has expired, exit, otherwise return FALSE. + * @param $exit_scope + * If TRUE the access token does not have the required scope(s), exit, + * otherwise return FALSE. + * @param $realm + * If you want to specify a particular realm for the WWW-Authenticate + * header, supply it here. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5 + * + * @ingroup oauth2_section_5 + */ + public function verifyAccessToken($scope = NULL, $exit_not_present = TRUE, $exit_invalid = TRUE, $exit_expired = TRUE, $exit_scope = TRUE, $realm = NULL) { + $token_param = $this->getAccessTokenParams(); + if ($token_param === FALSE) // Access token was not provided + return $exit_not_present ? $this->errorWWWAuthenticateResponseHeader(OAUTH2_HTTP_BAD_REQUEST, $realm, OAUTH2_ERROR_INVALID_REQUEST, 'The request is missing a required parameter, includes an unsupported parameter or parameter value, repeats the same parameter, uses more than one method for including an access token, or is otherwise malformed.', NULL, $scope) : FALSE; + // Get the stored token data (from the implementing subclass) + $token = $this->getAccessToken($token_param); + if ($token === NULL) + return $exit_invalid ? $this->errorWWWAuthenticateResponseHeader(OAUTH2_HTTP_UNAUTHORIZED, $realm, OAUTH2_ERROR_INVALID_TOKEN, 'The access token provided is invalid.', NULL, $scope) : FALSE; + + // Check token expiration (I'm leaving this check separated, later we'll fill in better error messages) + if (isset($token["expires"]) && time() > $token["expires"]) + return $exit_expired ? $this->errorWWWAuthenticateResponseHeader(OAUTH2_HTTP_UNAUTHORIZED, $realm, OAUTH2_ERROR_EXPIRED_TOKEN, 'The access token provided has expired.', NULL, $scope) : FALSE; + + // Check scope, if provided + // If token doesn't have a scope, it's NULL/empty, or it's insufficient, then throw an error + if ($scope && (!isset($token["scope"]) || !$token["scope"] || !$this->checkScope($scope, $token["scope"]))) + return $exit_scope ? $this->errorWWWAuthenticateResponseHeader(OAUTH2_HTTP_FORBIDDEN, $realm, OAUTH2_ERROR_INSUFFICIENT_SCOPE, 'The request requires higher privileges than provided by the access token.', NULL, $scope) : FALSE; + + return TRUE; + } + + /** + * Check if everything in required scope is contained in available scope. + * + * @param $required_scope + * Required scope to be check with. + * @param $available_scope + * Available scope to be compare with. + * + * @return + * TRUE if everything in required scope is contained in available scope, + * and False if it isn't. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5 + * + * @ingroup oauth2_section_5 + */ + private function checkScope($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); + } + + /** + * Pulls the access token out of the HTTP request. + * + * Either from the Authorization header or GET/POST/etc. + * + * @return + * Access token value if present, and FALSE if it isn't. + * + * @todo Support PUT or DELETE. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.1 + * + * @ingroup oauth2_section_5 + */ + private function getAccessTokenParams() { + $auth_header = $this->getAuthorizationHeader(); + + if ($auth_header !== FALSE) { + // Make sure only the auth header is set + if (isset($_GET[OAUTH2_TOKEN_PARAM_NAME]) || isset($_POST[OAUTH2_TOKEN_PARAM_NAME])) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Auth token found in GET or POST when token present in header'); + + $auth_header = trim($auth_header); + + // Make sure it's Token authorization + if (strcmp(substr($auth_header, 0, 5), "OAuth ") !== 0) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Auth header found that doesn\'t start with "OAuth"'); + + // Parse the rest of the header + if (preg_match('/\s*OAuth\s*="(.+)"/', substr($auth_header, 5), $matches) == 0 || count($matches) < 2) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Malformed auth header'); + + return $matches[1]; + } + + if (isset($_GET[OAUTH2_TOKEN_PARAM_NAME])) { + if (isset($_POST[OAUTH2_TOKEN_PARAM_NAME])) // Both GET and POST are not allowed + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Only send the token in GET or POST, not both'); + + return $_GET[OAUTH2_TOKEN_PARAM_NAME]; + } + + if (isset($_POST[OAUTH2_TOKEN_PARAM_NAME])) + return $_POST[OAUTH2_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. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4 + * + * @ingroup oauth2_section_4 + */ + public function grantAccessToken() { + $filters = array( + "grant_type" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => OAUTH2_GRANT_TYPE_REGEXP), "flags" => FILTER_REQUIRE_SCALAR), + "scope" => array("flags" => FILTER_REQUIRE_SCALAR), + "code" => array("flags" => FILTER_REQUIRE_SCALAR), + "redirect_uri" => array("filter" => FILTER_SANITIZE_URL), + "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"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Invalid grant_type parameter or parameter missing'); + + // Make sure we've implemented the requested grant type + if (!in_array($input["grant_type"], $this->getSupportedGrantTypes())) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_UNSUPPORTED_GRANT_TYPE); + + // Authorize the client + $client = $this->getClientCredentials(); + + if ($this->checkClientCredentials($client[0], $client[1]) === FALSE) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_CLIENT); + + if (!$this->checkRestrictedGrantType($client[0], $input["grant_type"])) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_UNAUTHORIZED_CLIENT); + + // Do the granting + switch ($input["grant_type"]) { + case OAUTH2_GRANT_TYPE_AUTH_CODE: + if (!$input["code"] || !$input["redirect_uri"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST); + + $stored = $this->getAuthCode($input["code"]); + + // Ensure that the input uri starts with the stored uri + if ($stored === NULL || (strcasecmp(substr($input["redirect_uri"], 0, strlen($stored["redirect_uri"])), $stored["redirect_uri"]) !== 0) || $client[0] != $stored["client_id"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_GRANT); + + if ($stored["expires"] < time()) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_EXPIRED_TOKEN); + + break; + case OAUTH2_GRANT_TYPE_USER_CREDENTIALS: + if (!$input["username"] || !$input["password"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'Missing parameters. "username" and "password" required'); + + $stored = $this->checkUserCredentials($client[0], $input["username"], $input["password"]); + + if ($stored === FALSE) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_GRANT); + + break; + case OAUTH2_GRANT_TYPE_ASSERTION: + if (!$input["assertion_type"] || !$input["assertion"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST); + + $stored = $this->checkAssertion($client[0], $input["assertion_type"], $input["assertion"]); + + if ($stored === FALSE) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_GRANT); + + break; + case OAUTH2_GRANT_TYPE_REFRESH_TOKEN: + if (!$input["refresh_token"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST, 'No "refresh_token" parameter found'); + + $stored = $this->getRefreshToken($input["refresh_token"]); + + if ($stored === NULL || $client[0] != $stored["client_id"]) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_GRANT); + + if ($stored["expires"] < time()) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_EXPIRED_TOKEN); + + // store the refresh token locally so we can delete it when a new refresh token is generated + $this->setVariable('_old_refresh_token', $stored["token"]); + + break; + case OAUTH2_GRANT_TYPE_NONE: + $stored = $this->checkNoneAccess($client[0]); + + if ($stored === FALSE) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_REQUEST); + } + + // Check scope, if provided + if ($input["scope"] && (!is_array($stored) || !isset($stored["scope"]) || !$this->checkScope($input["scope"], $stored["scope"]))) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_SCOPE); + + if (!$input["scope"]) + $input["scope"] = NULL; + + $token = $this->createAccessToken($client[0], $input["scope"]); + + $this->sendJsonHeaders(); + echo json_encode($token); + } + + /** + * Internal function used to get the client credentials from HTTP basic + * auth or POST data. + * + * @return + * A list containing the client identifier and password, for example + * @code + * return array( + * $_POST["client_id"], + * $_POST["client_secret"], + * ); + * @endcode + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-2 + * + * @ingroup oauth2_section_2 + */ + protected function getClientCredentials() { + if (isset($_SERVER["PHP_AUTH_USER"]) && $_POST && isset($_POST["client_id"])) + $this->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_CLIENT); + + // Try basic auth + if (isset($_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->errorJsonResponse(OAUTH2_HTTP_BAD_REQUEST, OAUTH2_ERROR_INVALID_CLIENT); + } + + // End-user/client Authorization (Section 3 of IETF Draft). + + /** + * Pull the authorization request data out of the HTTP request. + * + * @return + * The authorization parameters so the authorization server can prompt + * the user for approval if valid. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3 + * + * @ingroup oauth2_section_3 + */ + public function getAuthorizeParams() { + $filters = array( + "client_id" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => OAUTH2_CLIENT_ID_REGEXP), "flags" => FILTER_REQUIRE_SCALAR), + "response_type" => array("filter" => FILTER_VALIDATE_REGEXP, "options" => array("regexp" => OAUTH2_AUTH_RESPONSE_TYPE_REGEXP), "flags" => FILTER_REQUIRE_SCALAR), + "redirect_uri" => array("filter" => FILTER_SANITIZE_URL), + "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"]) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_INVALID_CLIENT, NULL, NULL, $input["state"]); + + $this->errorJsonResponse(OAUTH2_HTTP_FOUND, OAUTH2_ERROR_INVALID_CLIENT); // 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 = $this->getRedirectUri($input["client_id"]); + + // At least one of: existing redirect URI or input redirect URI must be specified + if (!$redirect_uri && !$input["redirect_uri"]) + $this->errorJsonResponse(OAUTH2_HTTP_FOUND, OAUTH2_ERROR_INVALID_REQUEST); + + // getRedirectUri() should return FALSE if the given client ID is invalid + // this probably saves us from making a separate db call, and simplifies the method set + if ($redirect_uri === FALSE) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_INVALID_CLIENT, NULL, NULL, $input["state"]); + + // If there's an existing uri and one from input, verify that they match + if ($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) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_REDIRECT_URI_MISMATCH, NULL, NULL, $input["state"]); + } + elseif ($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"]) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_INVALID_REQUEST, 'Invalid response type.', NULL, $input["state"]); + + // Check requested auth response type against the list of supported types + if (array_search($input["response_type"], $this->getSupportedAuthResponseTypes()) === FALSE) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_UNSUPPORTED_RESPONSE_TYPE, NULL, NULL, $input["state"]); + + // Restrict clients to certain authorization response types + if ($this->checkRestrictedAuthResponseType($input["client_id"], $input["response_type"]) === FALSE) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_UNAUTHORIZED_CLIENT, NULL, NULL, $input["state"]); + + // Validate that the requested scope is supported + if ($input["scope"] && !$this->checkScope($input["scope"], $this->getSupportedScopes())) + $this->errorDoRedirectUriCallback($input["redirect_uri"], OAUTH2_ERROR_INVALID_SCOPE, NULL, NULL, $input["state"]); + + return $input; + } + + /** + * Redirect the user appropriately after approval. + * + * After the user has approved or denied the access request the + * authorization server should call this function to redirect the user + * appropriately. + * + * @param $is_authorized + * TRUE or FALSE depending on whether the user authorized the access. + * @param $params + * An associative array as below: + * - response_type: The requested response: an access token, an + * authorization code, or both. + * - client_id: The client identifier as described in Section 2. + * - redirect_uri: An absolute URI to which the authorization server + * will redirect the user-agent to when the end-user authorization + * step is completed. + * - scope: (optional) The scope of the access request expressed as a + * list of space-delimited strings. + * - state: (optional) An opaque value used by the client to maintain + * state between the request and callback. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3 + * + * @ingroup oauth2_section_3 + */ + public function finishClientAuthorization($is_authorized, $params = array()) { + $params += array( + 'scope' => NULL, + 'state' => NULL, + ); + extract($params); + + if ($state !== NULL) + $result["query"]["state"] = $state; + + if ($is_authorized === FALSE) { + $result["query"]["error"] = OAUTH2_ERROR_USER_DENIED; + } + else { + if ($response_type == OAUTH2_AUTH_RESPONSE_TYPE_AUTH_CODE || $response_type == OAUTH2_AUTH_RESPONSE_TYPE_CODE_AND_TOKEN) + $result["query"]["code"] = $this->createAuthCode($client_id, $redirect_uri, $scope); + + if ($response_type == OAUTH2_AUTH_RESPONSE_TYPE_ACCESS_TOKEN || $response_type == OAUTH2_AUTH_RESPONSE_TYPE_CODE_AND_TOKEN) + $result["fragment"] = $this->createAccessToken($client_id, $scope); + } + + $this->doRedirectUriCallback($redirect_uri, $result); + } + + // Other/utility functions. + + /** + * Redirect the user agent. + * + * Handle both redirect for success or error response. + * + * @param $redirect_uri + * An absolute URI to which the authorization server will redirect + * the user-agent to when the end-user authorization step is completed. + * @param $params + * Parameters to be pass though buildUri(). + * + * @ingroup oauth2_section_3 + */ + private function doRedirectUriCallback($redirect_uri, $params) { + header("HTTP/1.1 ". OAUTH2_HTTP_FOUND); + header("Location: " . $this->buildUri($redirect_uri, $params)); + exit; + } + + /** + * Build the absolute URI based on supplied URI and parameters. + * + * @param $uri + * An absolute URI. + * @param $params + * Parameters to be append as GET. + * + * @return + * An absolute URI with supplied parameters. + * + * @ingroup oauth2_section_3 + */ + private function buildUri($uri, $params) { + $parse_url = parse_url($uri); + + // Add our params to the parsed uri + foreach ($params 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"] : ""); + } + + /** + * Handle the creation of access token, also issue refresh token if support. + * + * This belongs in a separate factory, but to keep it simple, I'm just + * keeping it here. + * + * @param $client_id + * Client identifier related to the access token. + * @param $scope + * (optional) Scopes to be stored in space-separated string. + * + * @ingroup oauth2_section_4 + */ + protected function createAccessToken($client_id, $scope = NULL) { + $token = array( + "access_token" => $this->genAccessToken(), + "expires_in" => $this->getVariable('access_token_lifetime', OAUTH2_DEFAULT_ACCESS_TOKEN_LIFETIME), + "scope" => $scope + ); + + $this->setAccessToken($token["access_token"], $client_id, time() + $this->getVariable('access_token_lifetime', OAUTH2_DEFAULT_ACCESS_TOKEN_LIFETIME), $scope); + + // Issue a refresh token also, if we support them + if (in_array(OAUTH2_GRANT_TYPE_REFRESH_TOKEN, $this->getSupportedGrantTypes())) { + $token["refresh_token"] = $this->genAccessToken(); + $this->setRefreshToken($token["refresh_token"], $client_id, time() + $this->getVariable('refresh_token_lifetime', OAUTH2_DEFAULT_REFRESH_TOKEN_LIFETIME), $scope); + // If we've granted a new refresh token, expire the old one + if ($this->getVariable('_old_refresh_token')) + $this->unsetRefreshToken($this->getVariable('_old_refresh_token')); + } + + return $token; + } + + /** + * Handle the creation of auth code. + * + * This belongs in a separate factory, but to keep it simple, I'm just + * keeping it here. + * + * @param $client_id + * Client identifier related to the access token. + * @param $redirect_uri + * An absolute URI to which the authorization server will redirect the + * user-agent to when the end-user authorization step is completed. + * @param $scope + * (optional) Scopes to be stored in space-separated string. + * + * @ingroup oauth2_section_3 + */ + private function createAuthCode($client_id, $redirect_uri, $scope = NULL) { + $code = $this->genAuthCode(); + $this->setAuthCode($code, $client_id, $redirect_uri, time() + $this->getVariable('auth_code_lifetime', OAUTH2_DEFAULT_AUTH_CODE_LIFETIME), $scope); + return $code; + } + + /** + * Generate unique access token. + * + * Implementing classes may want to override these function to implement + * other access token or auth code generation schemes. + * + * @return + * An unique access token. + * + * @ingroup oauth2_section_4 + */ + protected function genAccessToken() { + return md5(base64_encode(pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), uniqid()))); + } + + /** + * Generate unique auth code. + * + * Implementing classes may want to override these function to implement + * other access token or auth code generation schemes. + * + * @return + * An unique auth code. + * + * @ingroup oauth2_section_3 + */ + protected function genAuthCode() { + return md5(base64_encode(pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), uniqid()))); + } + + /** + * Pull out the Authorization HTTP header and return it. + * + * Implementing classes may need to override this function for use on + * non-Apache web servers. + * + * @return + * The Authorization HTTP header, and FALSE if does not exist. + * + * @todo Handle Authorization HTTP header for non-Apache web servers. + * + * @ingroup oauth2_section_5 + */ + private function getAuthorizationHeader() { + 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; + } + + /** + * Send out HTTP headers for JSON. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.2 + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3 + * + * @ingroup oauth2_section_4 + */ + private function sendJsonHeaders() { + header("Content-Type: application/json"); + header("Cache-Control: no-store"); + } + + /** + * Redirect the end-user's user agent with error message. + * + * @param $redirect_uri + * An absolute URI to which the authorization server will redirect the + * user-agent to when the end-user authorization step is completed. + * @param $error + * A single error code as described in Section 3.2.1. + * @param $error_description + * (optional) A human-readable text providing additional information, + * used to assist in the understanding and resolution of the error + * occurred. + * @param $error_uri + * (optional) A URI identifying a human-readable web page with + * information about the error, used to provide the end-user with + * additional information about the error. + * @param $state + * (optional) REQUIRED if the "state" parameter was present in the client + * authorization request. Set to the exact value received from the client. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-3.2 + * + * @ingroup oauth2_error + */ + private function errorDoRedirectUriCallback($redirect_uri, $error, $error_description = NULL, $error_uri = NULL, $state = NULL) { + $result["query"]["error"] = $error; + + if ($state) + $result["query"]["state"] = $state; + + if ($this->getVariable('display_error') && $error_description) + $result["query"]["error_description"] = $error_description; + + if ($this->getVariable('display_error') && $error_uri) + $result["query"]["error_uri"] = $error_uri; + + $this->doRedirectUriCallback($redirect_uri, $result); + } + + /** + * Send out error message in JSON. + * + * @param $http_status_code + * HTTP status code message as predefined. + * @param $error + * A single error code. + * @param $error_description + * (optional) A human-readable text providing additional information, + * used to assist in the understanding and resolution of the error + * occurred. + * @param $error_uri + * (optional) A URI identifying a human-readable web page with + * information about the error, used to provide the end-user with + * additional information about the error. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-4.3 + * + * @ingroup oauth2_error + */ + private function errorJsonResponse($http_status_code, $error, $error_description = NULL, $error_uri = NULL) { + $result['error'] = $error; + + if ($this->getVariable('display_error') && $error_description) + $result["error_description"] = $error_description; + + if ($this->getVariable('display_error') && $error_uri) + $result["error_uri"] = $error_uri; + + header("HTTP/1.1 " . $http_status_code); + $this->sendJsonHeaders(); + echo json_encode($result); + + exit; + } + + /** + * Send a 401 unauthorized header with the given realm and an error, if + * provided. + * + * @param $http_status_code + * HTTP status code message as predefined. + * @param $realm + * The "realm" attribute is used to provide the protected resources + * partition as defined by [RFC2617]. + * @param $scope + * A space-delimited list of scope values indicating the required scope + * of the access token for accessing the requested resource. + * @param $error + * The "error" attribute is used to provide the client with the reason + * why the access request was declined. + * @param $error_description + * (optional) The "error_description" attribute provides a human-readable text + * containing additional information, used to assist in the understanding + * and resolution of the error occurred. + * @param $error_uri + * (optional) The "error_uri" attribute provides a URI identifying a human-readable + * web page with information about the error, used to offer the end-user + * with additional information about the error. If the value is not an + * absolute URI, it is relative to the URI of the requested protected + * resource. + * + * @see http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2 + * + * @ingroup oauth2_error + */ + private function errorWWWAuthenticateResponseHeader($http_status_code, $realm, $error, $error_description = NULL, $error_uri = NULL, $scope = NULL) { + $realm = $realm === NULL ? $this->getDefaultAuthenticationRealm() : $realm; + + $result = "WWW-Authenticate: OAuth realm='" . $realm . "'"; + + if ($error) + $result .= ", error='" . $error . "'"; + + if ($this->getVariable('display_error') && $error_description) + $result .= ", error_description='" . $error_description . "'"; + + if ($this->getVariable('display_error') && $error_uri) + $result .= ", error_uri='" . $error_uri . "'"; + + if ($scope) + $result .= ", scope='" . $scope . "'"; + + header("HTTP/1.1 ". $http_status_code); + header($result); + + exit; + } +} |