From f6ebcd34f275d8bcc1094cbb98df2ff2b8fef1b5 Mon Sep 17 00:00:00 2001 From: Simon Coggins Date: Mon, 16 Sep 2013 20:15:32 +1200 Subject: [PATCH] MDL-40848 badges: Validate backpack connection via Persona Instead of trusting that the user owns the email address they supply, we now require them to login via Persona before connecting them to the backpack --- badges/backpack.js | 85 +++++++++++++- badges/backpack_form.php | 49 ++++---- badges/backpackconnect.php | 136 ++++++++++++++++++++++ badges/lib/backpacklib.php | 6 + lang/en/badges.php | 17 ++- pix/i/persona_sign_in_black.png | Bin 0 -> 3543 bytes theme/base/style/core.css | 1 + theme/bootstrapbase/less/moodle/core.less | 6 + theme/bootstrapbase/style/moodle.css | 2 +- 9 files changed, 276 insertions(+), 26 deletions(-) create mode 100644 badges/backpackconnect.php create mode 100644 pix/i/persona_sign_in_black.png diff --git a/badges/backpack.js b/badges/backpack.js index 98678e8f29e..d20ad17d6f3 100644 --- a/badges/backpack.js +++ b/badges/backpack.js @@ -43,4 +43,87 @@ function check_site_access() { }); return false; -} \ No newline at end of file +} + +/* + * Update the status indicator to show connection progress. + */ +function badges_set_connection_progress(status) { + switch (status) { + case 'connecting': + var connecting = M.util.get_string('connecting', 'badges'); + var imageurl = M.util.image_url('i/loading_small', 'moodle'); + var loading = Y.Node.create(connecting + ' '+connecting+''); + Y.one('#connection-status').removeClass('notconnected').addClass('connecting').setHTML(loading); + break; + case 'notconnected': + var notconnected = M.util.get_string('notconnected', 'badges');; + Y.one('#connection-status').removeClass('connecting').addClass('notconnected').setHTML(notconnected); + break; + default: + // Unknown status, do nothing. + } +} + +/* + * Print an error message at the top of the page. + */ +function badges_set_error_message(messagekey, param) { + var errortext = M.util.get_string(messagekey, 'badges', param); + Y.one('#connection-error').setHTML(errortext); +} + +/* + * Handle the assertion generated by the Persona dialog. + */ +function badges_handle_assertion(assertion) { + + if (!assertion) { + var noassertionstr = M.util.get_string('error:noassertion', 'badges'); + badges_set_error_message('error:backpackloginfailed', noassertionstr); + return; + } + + badges_set_connection_progress('connecting'); + + Y.io("backpackconnect.php", { + method: "POST", + data: "assertion="+assertion+"&sesskey="+M.cfg.sesskey, + on: { + success: function (id, result) { + // Reload page to display connected email address. + window.location.href = "mybackpack.php"; + }, + failure: function (id, result) { + try { + var parsedResponse = Y.JSON.parse(result.response); + } catch (e) { + badges_set_connection_progress('notconnected'); + var badjsonstr = M.util.get_string('error:badjson', 'badges'); + badges_set_error_message('error:backpackloginfailed', badjsonstr); + return; + } + badges_set_connection_progress('notconnected'); + badges_set_error_message('error:backpackloginfailed', parsedResponse.reason); + return; + } + } + }); +} + +/** + * Create and bind the persona login button. + */ +function badges_init_persona_login_button() { + // Create the login button and add to the page via Javascript. + var imageurl = M.util.image_url('i/persona_sign_in_black', 'moodle'); + var imagealt = M.util.get_string('signinwithyouremail', 'badges'); + var button = Y.Node.create(''+imagealt+''); + Y.one('#persona-container').append(button); + + // Bind a click event to trigger login when clicked. + button.on('click', function() { + Y.one('#connection-error').empty(); + navigator.id.get(badges_handle_assertion); + }); +} diff --git a/badges/backpack_form.php b/badges/backpack_form.php index dce06305ec1..ad9d427feb1 100644 --- a/badges/backpack_form.php +++ b/badges/backpack_form.php @@ -39,28 +39,37 @@ class edit_backpack_form extends moodleform { * Defines the form */ public function definition() { - global $USER; + global $USER, $PAGE, $OUTPUT; $mform = $this->_form; + $mform->addElement('html', html_writer::tag('span', '', array('class' => 'notconnected', 'id' => 'connection-error'))); $mform->addElement('header', 'backpackheader', get_string('backpackconnection', 'badges')); $mform->addHelpButton('backpackheader', 'backpackconnection', 'badges'); - $mform->addElement('static', 'url', get_string('url'), 'http://backpack.openbadges.org'); - $status = html_writer::tag('span', get_string('notconnected', 'badges'), array('class' => 'notconnected')); + $mform->addElement('static', 'url', get_string('url'), BADGE_BACKPACKURL); + $status = html_writer::tag('span', get_string('notconnected', 'badges'), + array('class' => 'notconnected', 'id' => 'connection-status')); $mform->addElement('static', 'status', get_string('status'), $status); - $mform->addElement('text', 'email', get_string('email'), array('size' => '50')); - $mform->setDefault('email', $USER->email); - $mform->setType('email', PARAM_RAW); - $mform->addRule('email', get_string('required'), 'required', null , 'client'); - $mform->addHelpButton('email', 'backpackemail', 'badges'); + $nojs = html_writer::tag('noscript', get_string('error:personaneedsjs', 'badges'), + array('class' => 'notconnected')); + $personadiv = $OUTPUT->container($nojs, null, 'persona-container'); + + $mform->addElement('static', 'persona', '', $personadiv); + $mform->addHelpButton('persona', 'personaconnection', 'badges'); + + $PAGE->requires->js(new moodle_url('https://login.persona.org/include.js')); + $PAGE->requires->js('/badges/backpack.js'); + $PAGE->requires->js_init_call('badges_init_persona_login_button', null, false); + $PAGE->requires->strings_for_js(array('error:backpackloginfailed', 'signinwithyouremail', + 'error:noassertion', 'error:connectionunknownreason', 'error:badjson', 'connecting', + 'notconnected'), 'badges'); $mform->addElement('hidden', 'userid', $USER->id); $mform->setType('userid', PARAM_INT); - $mform->addElement('hidden', 'backpackurl', 'http://backpack.openbadges.org'); + $mform->addElement('hidden', 'backpackurl', BADGE_BACKPACKURL); $mform->setType('backpackurl', PARAM_URL); - $this->add_action_buttons(true, get_string('connect', 'badges')); } /** @@ -70,18 +79,14 @@ class edit_backpack_form extends moodleform { global $DB; $errors = parent::validation($data, $files); - if (!validate_email($data['email'])) { - $errors['email'] = get_string('invalidemail'); - } else { - $check = new stdClass(); - $check->backpackurl = $data['backpackurl']; - $check->email = $data['email']; + $check = new stdClass(); + $check->backpackurl = $data['backpackurl']; + $check->email = $data['email']; - $bp = new OpenBadgesBackpackHandler($check); - $request = $bp->curl_request('user'); - if (isset($request->status) && $request->status == 'missing') { - $errors['email'] = get_string('error:nosuchuser', 'badges'); - } + $bp = new OpenBadgesBackpackHandler($check); + $request = $bp->curl_request('user'); + if (isset($request->status) && $request->status == 'missing') { + $errors['email'] = get_string('error:nosuchuser', 'badges'); } return $errors; } @@ -113,7 +118,7 @@ class edit_collections_form extends moodleform { $mform->addElement('header', 'backpackheader', get_string('backpackconnection', 'badges')); $mform->addHelpButton('backpackheader', 'backpackconnection', 'badges'); - $mform->addElement('static', 'url', get_string('url'), 'http://backpack.openbadges.org'); + $mform->addElement('static', 'url', get_string('url'), BADGE_BACKPACKURL); $status = html_writer::tag('span', get_string('connected', 'badges'), array('class' => 'connected')); $mform->addElement('static', 'status', get_string('status'), $status); diff --git a/badges/backpackconnect.php b/badges/backpackconnect.php new file mode 100644 index 00000000000..55bc2ecf0c8 --- /dev/null +++ b/badges/backpackconnect.php @@ -0,0 +1,136 @@ +. + +/** + * AJAX script for validating backpack connection. + * + * @package core + * @subpackage badges + * @copyright 2012 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/} + * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later + * @author Simon Coggins + */ + +define('AJAX_SCRIPT', true); + +require_once(dirname(dirname(__FILE__)) . '/config.php'); +require_once($CFG->dirroot . '/badges/lib/backpacklib.php'); +require_once($CFG->libdir . '/filelib.php'); + +require_sesskey(); +require_login(); +$PAGE->set_url('/badges/backpackconnect.php'); +$PAGE->set_context(context_system::instance()); + +// Use PHP input filtering as there is no PARAM type for +// the type of cleaning that is required (ASCII chars 32-127 only). +$assertion = filter_input( + INPUT_POST, + 'assertion', + FILTER_UNSAFE_RAW, + FILTER_FLAG_STRIP_LOW|FILTER_FLAG_STRIP_HIGH +); + +// Audience is the site url scheme + host + port only. +$wwwparts = parse_url($CFG->wwwroot); +$audience = $wwwparts['scheme'] . '://' . $wwwparts['host']; +$audience .= isset($wwwparts['port']) ? $wwwparts['port'] : ''; +$params = 'assertion=' . urlencode($assertion) . '&audience=' . + urlencode($audience); + +$curl = new curl(); +$url = 'https://verifier.login.persona.org/verify'; +$options = array( + 'FRESH_CONNECT' => true, + 'RETURNTRANSFER' => true, + 'FORBID_REUSE' => true, + 'SSL_VERIFYPEER' => true, + 'SSL_VERIFYHOST' => 2, + 'HEADER' => 0, + 'HTTPHEADER' => array('Content-type: application/x-www-form-urlencoded'), + 'CONNECTTIMEOUT' => 0, + 'TIMEOUT' => 10, // Fail if data not returned within 10 seconds. +); +$result = $curl->post($url, $params, $options); + +// Handle time-out and failed request. +if ($curl->errno != 0) { + if ($curl->errno == CURLE_OPERATION_TIMEOUTED) { + $reason = get_string('error:requesttimeout', 'badges'); + } else { + $reason = get_string('error:requesterror', 'badges', $curl->errno); + } + badges_send_response('failure', $reason); +} + +$data = json_decode($result); + +if (!isset($data->status) || $data->status != 'okay') { + $reason = isset($data->reason) ? $data->reason : get_string('error:connectionunknownreason', 'badges'); + badges_send_response('failure', $reason); +} + +// Make sure email matches a backpack. +$check = new stdClass(); +$check->backpackurl = BADGE_BACKPACKURL; +$check->email = $data->email; + +$bp = new OpenBadgesBackpackHandler($check); +$request = $bp->curl_request('user'); +if (isset($request->status) && $request->status == 'missing') { + $reason = get_string('error:backpackemailnotfound', 'badges', $data->email); + badges_send_response('failure', $reason); +} else if (empty($request->userId)) { + $reason = get_string('error:backpackdatainvalid', 'badges'); + badges_send_response('failure', $reason); +} else { + $backpackuid = $request->userId; +} + +// Insert record. +$obj = new stdClass(); +$obj->userid = $USER->id; +$obj->email = $data->email; +$obj->backpackurl = BADGE_BACKPACKURL; +$obj->backpackuid = $backpackuid; +$obj->autosync = 0; +$obj->password = ''; +$DB->insert_record('badge_backpack', $obj); + +// Return success indicator and email address. +badges_send_response('success', $data->email); + + +/** + * Return a JSON response containing the response provided. + * + * @param string $status Status of the response, typically 'success' or 'failure'. + * @param string $responsetext On success, the email address of the user, + * otherwise a reason for the failure. + * @return void Outputs the JSON and terminates the script. + */ +function badges_send_response($status, $responsetext) { + $out = new stdClass(); + $out->status = $status; + if ($status == 'success') { + $out->email = $responsetext; + } else { + $out->reason = $responsetext; + send_header_404(); + } + echo json_encode($out); + exit; +} diff --git a/badges/lib/backpacklib.php b/badges/lib/backpacklib.php index 4ecf084257e..6e6b3da55f0 100644 --- a/badges/lib/backpacklib.php +++ b/badges/lib/backpacklib.php @@ -26,6 +26,12 @@ defined('MOODLE_INTERNAL') || die(); +/* + * URL of backpack. Currently only the Open Badges backpack + * is supported. + */ +define('BADGE_BACKPACKURL', 'http://backpack.openbadges.org'); + global $CFG; require_once($CFG->libdir . '/filelib.php'); diff --git a/lang/en/badges.php b/lang/en/badges.php index 09cc67510ff..f8331052a89 100644 --- a/lang/en/badges.php +++ b/lang/en/badges.php @@ -82,9 +82,11 @@ $string['backpackconnection_help'] = 'This page allows you to set up connection Currently, only Mozilla OpenBadges Backpack is supported. You need to sign up for a backpack service before trying to set up backpack connection on this page.'; $string['backpackdetails'] = 'Backpack settings'; $string['backpackemail'] = 'Email address'; -$string['backpackemail_help'] = 'Email address associated with your backpack. +$string['backpackemail_help'] = 'The email address associated with your backpack. While you are connected, any badges earned on this site will be associated with this email address.'; +$string['personaconnection'] = 'Sign in with your email'; +$string['personaconnection_help'] = 'Persona is a system for identifying yourself across the web, using an email address that you own. The Open Badges backpack uses Persona as a login system, so to be able to connect to a backpack you with need a Persona account. -If backpack connection is established, this email address is used instead of your internal email address to push badges to your backpack.'; +For more information about Persona visit https://login.persona.org/about.'; $string['backpackimport'] = 'Badge import settings'; $string['backpackimport_help'] = 'After backpack connection is successfully established, badges from your backpack can be displayed on your "My Badges" page and your profile page. @@ -128,6 +130,7 @@ $string['configenablebadges'] = 'When enabled, this feature lets you create badg $string['configuremessage'] = 'Badge message'; $string['connect'] = 'Connect'; $string['connected'] = 'Connected'; +$string['connecting'] = 'Connecting...'; $string['contact'] = 'Contact'; $string['contact_help'] = 'An email address associated with the badge issuer.'; $string['copyof'] = 'Copy of {$a}'; @@ -199,10 +202,15 @@ $string['disconnect'] = 'Disconnect'; $string['donotaward'] = 'Currently, this badge is not active, so it cannot be awarded to users. If you would like to award this badge, please set its status to active.'; $string['editsettings'] = 'Edit settings'; $string['enablebadges'] = 'Enable badges'; +$string['error:backpackdatainvalid'] = 'The data return from the backpack was invalid.'; +$string['error:backpackemailnotfound'] = 'The email \'{$a}\' is not associated with a backpack. You need to create a backpack for that account or sign in with another email address.'; $string['error:backpacknotavailable'] = 'Your site is not accessible from the Internet, so any badges issued from this site cannot be verified by external backpack services.'; +$string['error:backpackloginfailed'] = 'You could not be connected to an external backpack for the following reason: {$a}'; $string['error:backpackproblem'] = 'There was a problem connecting to your backpack service provider. Please try again later.'; +$string['error:badjson'] = 'The connection attempt returned invalid data.'; $string['error:cannotact'] = 'Cannot activate the badge. '; $string['error:cannotawardbadge'] = 'Cannot award badge to a user.'; +$string['error:connectionunknownreason'] = 'The connection was unsuccessful but no reason was given.'; $string['error:clone'] = 'Cannot clone the badge.'; $string['error:duplicatename'] = 'Badge with such name already exists in the system.'; $string['error:externalbadgedoesntexist'] = 'Badge not found'; @@ -211,6 +219,7 @@ $string['error:invalidcriteriatype'] = 'Invalid criteria type.'; $string['error:invalidexpiredate'] = 'Expiry date has to be in the future.'; $string['error:invalidexpireperiod'] = 'Expiry period cannot be negative or equal 0.'; $string['error:noactivities'] = 'There are no activities with completion criteria enabled in this course.'; +$string['error:noassertion'] = 'No assertion was returned by Persona. You may have closed the dialog before completing the login process.'; $string['error:nocourses'] = 'Course completion is not enabled for any of the courses in this site, so none can be displayed. Course completion may be enabled in the course settings.'; $string['error:nogroups'] = '

There are no public collections of badges available in your backpack.

Only public collections are shown, visit your backpack to create some public collections.

'; @@ -223,6 +232,9 @@ $string['error:nosuchrole'] = 'Warning: This role is no longer available.'; $string['error:nosuchuser'] = 'User with this email address does not have an account with the current backpack provider.'; $string['error:notifycoursedate'] = 'Warning: Badges associated with course and activity completions will not be issued until the course start date.'; $string['error:parameter'] = 'Warning: At least one parameter should be selected to ensure correct badge issuing workflow.'; +$string['error:personaneedsjs'] = 'Currently, Javascript is required to connect to your backpack. If you can, enable Javascript and reload the page.'; +$string['error:requesttimeout'] = 'The connection request timed out before it could complete.'; +$string['error:requesterror'] = 'The connection request failed (error code {$a}).'; $string['error:save'] = 'Cannot save the badge.'; $string['evidence'] = 'Evidence'; $string['existingrecipients'] = 'Existing badge recipients'; @@ -323,6 +335,7 @@ $string['selectgroup_end'] = 'Only public collections are shown, .smartselect_menuitem_label{font-weight:bold}#page-admin-registration-register .registration_textfield{width:300px}.userenrolment{width:100%;border-collapse:collapse}.userenrolment td{height:41px;padding:0}.userenrolment .subfield{margin-right:5px}.userenrolment .col_userdetails .subfield_picture{float:left}.userenrolment .col_lastseen{width:150px}.userenrolment .col_role{width:262px}.userenrolment .col_role .roles{margin-right:30px}.userenrolment .col_role .role{float:left;padding:3px;margin:3px}.dir-rtl .userenrolment .col_role 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