/**
* Checks whether the given URL is blacklisted by checking its address and port number against the black/white lists.
* The behaviour of this function can be classified as strict, as it returns true for URLs which are invalid or
* could not be parsed, as well as those valid URLs which were found in the blacklist.
*
* @param string $urlstring the URL to check.
* @return bool true if the URL is blacklisted or invalid and false if the URL is not blacklisted.
*/
public function url_is_blocked($urlstring)
{
// If no config data is present, then all hosts/ports are allowed.
if (!$this->is_enabled()) {
return false;
}
// Try to parse the URL to get the 'host' and 'port' components.
try {
$url = new \moodle_url($urlstring);
$parsed['scheme'] = $url->get_scheme();
$parsed['host'] = $url->get_host();
$parsed['port'] = $url->get_port();
} catch (\moodle_exception $e) {
// Moodle exception is thrown if the $urlstring is invalid. Treat as blocked.
return true;
}
// The port will be empty unless explicitly set in the $url (uncommon), so try to infer it from the supported schemes.
if (!$parsed['port'] && $parsed['scheme'] && isset($this->transportschemes[$parsed['scheme']])) {
$parsed['port'] = $this->transportschemes[$parsed['scheme']];
}
if ($parsed['port'] && $parsed['host']) {
// Check the host and port against the blacklist/whitelist entries.
return $this->host_is_blocked($parsed['host']) || $this->port_is_blocked($parsed['port']);
}
return true;
}
public function test_moodle_url_get_scheme()
{
// Should return the scheme only.
$url = new moodle_url('http://www.example.org:447/my/file/is/here.txt?really=1');
$this->assertSame('http', $url->get_scheme());
// Should work for secure URLs.
$url = new moodle_url('https://www.example.org:447/my/file/is/here.txt?really=1');
$this->assertSame('https', $url->get_scheme());
// Should return an empty string if no scheme is specified.
$url = new moodle_url('www.example.org:447/my/file/is/here.txt?really=1');
$this->assertSame('', $url->get_scheme());
}
/**
* Processes the tool provider's response to the ContentItemSelectionRequest and builds the configuration data from the
* selected content item. This configuration data can be then used when adding a tool into the course.
*
* @param int $typeid The tool type ID.
* @param string $messagetype The value for the lti_message_type parameter.
* @param string $ltiversion The value for the lti_version parameter.
* @param string $consumerkey The consumer key.
* @param string $contentitemsjson The JSON string for the content_items parameter.
* @return stdClass The array of module information objects.
* @throws moodle_exception
* @throws lti\OAuthException
*/
function lti_tool_configuration_from_content_item($typeid, $messagetype, $ltiversion, $consumerkey, $contentitemsjson)
{
$tool = lti_get_type($typeid);
// Validate parameters.
if (!$tool) {
throw new moodle_exception('errortooltypenotfound', 'mod_lti');
}
// Check lti_message_type. Show debugging if it's not set to ContentItemSelection.
// No need to throw exceptions for now since lti_message_type does not seem to be used in this processing at the moment.
if ($messagetype !== 'ContentItemSelection') {
debugging("lti_message_type is invalid: {$messagetype}. It should be set to 'ContentItemSelection'.", DEBUG_DEVELOPER);
}
$typeconfig = lti_get_type_config($typeid);
if (isset($tool->toolproxyid)) {
$islti2 = true;
$toolproxy = lti_get_tool_proxy($tool->toolproxyid);
$key = $toolproxy->guid;
$secret = $toolproxy->secret;
} else {
$islti2 = false;
$toolproxy = null;
if (!empty($typeconfig['resourcekey'])) {
$key = $typeconfig['resourcekey'];
} else {
$key = '';
}
if (!empty($typeconfig['password'])) {
$secret = $typeconfig['password'];
} else {
$secret = '';
}
}
// Check LTI versions from our side and the response's side. Show debugging if they don't match.
// No need to throw exceptions for now since LTI version does not seem to be used in this processing at the moment.
$expectedversion = LTI_VERSION_1;
if ($islti2) {
$expectedversion = LTI_VERSION_2;
}
if ($ltiversion !== $expectedversion) {
debugging("lti_version from response does not match the tool's configuration. Tool: {$expectedversion}," . " Response: {$ltiversion}", DEBUG_DEVELOPER);
}
if ($consumerkey !== $key) {
throw new moodle_exception('errorincorrectconsumerkey', 'mod_lti');
}
$store = new lti\TrivialOAuthDataStore();
$store->add_consumer($key, $secret);
$server = new lti\OAuthServer($store);
$method = new lti\OAuthSignatureMethod_HMAC_SHA1();
$server->add_signature_method($method);
$request = lti\OAuthRequest::from_request();
try {
$server->verify_request($request);
} catch (lti\OAuthException $e) {
throw new lti\OAuthException("OAuth signature failed: " . $e->getMessage());
}
$items = json_decode($contentitemsjson);
if (empty($items)) {
throw new moodle_exception('errorinvaliddata', 'mod_lti', '', $contentitemsjson);
}
if ($items->{'@context'} !== 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem') {
throw new moodle_exception('errorinvalidmediatype', 'mod_lti', '', $items->{'@context'});
}
if (!isset($items->{'@graph'}) || !is_array($items->{'@graph'}) || count($items->{'@graph'}) > 1) {
throw new moodle_exception('errorinvalidresponseformat', 'mod_lti');
}
$config = null;
if (!empty($items->{'@graph'})) {
$item = $items->{'@graph'}[0];
$config = new stdClass();
$config->name = '';
if (isset($item->title)) {
$config->name = $item->title;
}
if (empty($config->name)) {
$config->name = $tool->name;
}
if (isset($item->text)) {
$config->introeditor = ['text' => $item->text, 'format' => FORMAT_PLAIN];
}
if (isset($item->icon->{'@id'})) {
$iconurl = new moodle_url($item->icon->{'@id'});
// Assign item's icon URL to secureicon or icon depending on its scheme.
if (strtolower($iconurl->get_scheme()) === 'https') {
$config->secureicon = $iconurl->out(false);
} else {
$config->icon = $iconurl->out(false);
}
}
if (isset($item->url)) {
$url = new moodle_url($item->url);
// Assign item URL to securetoolurl or toolurl depending on its scheme.
if (strtolower($url->get_scheme()) === 'https') {
$config->securetoolurl = $url->out(false);
} else {
$config->toolurl = $url->out(false);
}
$config->typeid = 0;
} else {
$config->typeid = $typeid;
}
$config->instructorchoicesendname = LTI_SETTING_NEVER;
$config->instructorchoicesendemailaddr = LTI_SETTING_NEVER;
$config->instructorchoiceacceptgrades = LTI_SETTING_NEVER;
$config->launchcontainer = LTI_LAUNCH_CONTAINER_DEFAULT;
if (isset($item->placementAdvice->presentationDocumentTarget)) {
if ($item->placementAdvice->presentationDocumentTarget === 'window') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_WINDOW;
} else {
if ($item->placementAdvice->presentationDocumentTarget === 'frame') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS;
} else {
if ($item->placementAdvice->presentationDocumentTarget === 'iframe') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_EMBED;
}
}
}
}
if (isset($item->custom)) {
$customparameters = [];
foreach ($item->custom as $key => $value) {
$customparameters[] = "{$key}={$value}";
}
$config->instructorcustomparameters = implode("\n", $customparameters);
}
}
return $config;
}
