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BasicLTI is a IMS Standard that allows web // based learning tools to be easily integrated in LMS as native ones. The IMS BasicLTI // specification is part of the IMS standard Common Cartridge 1.1 Sakai and other main LMS // are already supporting or going to support BasicLTI. This project Implements the consumer // for Moodle. Moodle is a Free Open source Learning Management System by Martin Dougiamas. // BasicLTI4Moodle is a project iniciated and leaded by Ludo(Marc Alier) and Jordi Piguillem // at the GESSI research group at UPC. // SimpleLTI consumer for Moodle is an implementation of the early specification of LTI // by Charles Severance (Dr Chuck) htp://dr-chuck.com , developed by Jordi Piguillem in a // Google Summer of Code 2008 project co-mentored by Charles Severance and Marc Alier. // // BasicLTI4Moodle is copyright 2009 by Marc Alier Forment, Jordi Piguillem and Nikolas Galanis // of the Universitat Politecnica de Catalunya http://www.upc.edu // Contact info: Marc Alier Forment granludo @ gmail.com or marc.alier @ upc.edu. namespace moodle\mod\lti; // Using a namespace as the basicLTI module imports classes with the same names. defined('MOODLE_INTERNAL') || die; require_once($CFG->dirroot . '/mod/lti/OAuth.php'); require_once($CFG->dirroot . '/mod/lti/TrivialStore.php'); /** * * @param int $typeid LTI type ID. * @param string[] $scopes Array of scopes which give permission for the current request. * * @return string|int|boolean The OAuth consumer key, the LTI type ID for the validated bearer token, true for requests not requiring a scope, otherwise false. */ function get_oauth_key_from_headers($typeid = null, $scopes = null) { global $DB; $now = time(); $requestheaders = OAuthUtil::get_headers(); if (isset($requestheaders['Authorization'])) { if (substr($requestheaders['Authorization'], 0, 6) == "OAuth ") { $headerparameters = OAuthUtil::split_header($requestheaders['Authorization']); return format_string($headerparameters['oauth_consumer_key']); } else if (empty($scopes)) { return true; } else if (substr($requestheaders['Authorization'], 0, 7) == 'Bearer ') { $tokenvalue = trim(substr($requestheaders['Authorization'], 7)); $conditions = array('token' => $tokenvalue); if (!empty($typeid)) { $conditions['typeid'] = intval($typeid); } $token = $DB->get_record('lti_access_tokens', $conditions); if ($token) { // Log token access. $DB->set_field('lti_access_tokens', 'lastaccess', $now, array('id' => $token->id)); $permittedscopes = json_decode($token->scope); if ((intval($token->validuntil) > $now) && !empty(array_intersect($scopes, $permittedscopes))) { return intval($token->typeid); } } } } return false; } function handle_oauth_body_post($oauthconsumerkey, $oauthconsumersecret, $body, $requestheaders = null) { if ($requestheaders == null) { $requestheaders = OAuthUtil::get_headers(); } // Must reject application/x-www-form-urlencoded. if (isset($requestheaders['Content-type'])) { if ($requestheaders['Content-type'] == 'application/x-www-form-urlencoded' ) { throw new OAuthException("OAuth request body signing must not use application/x-www-form-urlencoded"); } } if (isset($requestheaders['Authorization']) && (substr($requestheaders['Authorization'], 0, 6) == "OAuth ")) { $headerparameters = OAuthUtil::split_header($requestheaders['Authorization']); $oauthbodyhash = $headerparameters['oauth_body_hash']; } if ( ! isset($oauthbodyhash) ) { throw new OAuthException("OAuth request body signing requires oauth_body_hash body"); } // Verify the message signature. $store = new TrivialOAuthDataStore(); $store->add_consumer($oauthconsumerkey, $oauthconsumersecret); $server = new OAuthServer($store); $method = new OAuthSignatureMethod_HMAC_SHA1(); $server->add_signature_method($method); $request = OAuthRequest::from_request(); try { $server->verify_request($request); } catch (\Exception $e) { $message = $e->getMessage(); throw new OAuthException("OAuth signature failed: " . $message); } $postdata = $body; $hash = base64_encode(sha1($postdata, true)); if ( $hash != $oauthbodyhash ) { throw new OAuthException("OAuth oauth_body_hash mismatch"); } return $postdata; }