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lti_util.php
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882 lines (767 loc) · 29.8 KB
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<?php
// Turn this off
if ( function_exists ( 'libxml_disable_entity_loader' ) ) libxml_disable_entity_loader();
require_once 'OAuth.php';
// Returns true if this is a Basic LTI message
// with minimum values to meet the protocol
function is_lti_request() {
$good_message_type = $_REQUEST["lti_message_type"] == "basic-lti-launch-request";
$good_lti_version = $_REQUEST["lti_version"] == "LTI-1p0";
$resource_link_id = $_REQUEST["resource_link_id"];
if ($good_message_type and $good_lti_version and isset($resource_link_id) ) return(true);
return false;
}
// Basic LTI Class that does the setup and provides utility
// functions
class BLTI {
public $valid = false;
public $complete = false;
public $message = false;
public $basestring = false;
public $info = false;
public $row = false;
public $context_id = false; // Override context_id
public $consumer_id = false;
public $user_id = false;
public $course_id = false;
public $resource_id = false;
function __construct($parm=false, $usesession=true, $doredirect=true) {
// If this request is not an LTI Launch, either
// give up or try to retrieve the context from session
if ( ! is_lti_request() ) {
if ( $usesession === false ) return;
if ( strlen(session_id()) > 0 ) {
$row = $_SESSION['_lti_row'];
if ( isset($row) ) $this->row = $row;
$context_id = $_SESSION['_lti_context_id'];
if ( isset($context_id) ) $this->context_id = $context_id;
$info = $_SESSION['_lti_context'];
if ( isset($info) ) {
$this->info = $info;
$this->valid = true;
return;
}
$this->message = "Could not find context in session";
return;
}
$this->message = "Session not available";
return;
}
// Insure we have a valid launch
if ( empty($_REQUEST["oauth_consumer_key"]) ) {
$this->message = "Missing oauth_consumer_key in request";
return;
}
$oauth_consumer_key = $_REQUEST["oauth_consumer_key"];
// Find the secret - either form the parameter as a string or
// look it up in a database from parameters we are given
$secret = false;
$row = false;
if ( is_string($parm) ) {
$secret = $parm;
} else if ( ! is_array($parm) ) {
$this->message = "Constructor requires a secret or database information.";
return;
} else {
$sql = 'SELECT * FROM '.$parm['table'].' WHERE '.
($parm['key_column'] ? $parm['key_column'] : 'oauth_consumer_key').
'='.
"'".mysql_real_escape_string($oauth_consumer_key)."'";
$result = mysql_query($sql);
$num_rows = mysql_num_rows($result);
if ( $num_rows != 1 ) {
$this->message = "Your consumer is not authorized oauth_consumer_key=".$oauth_consumer_key;
return;
} else {
while ($row = mysql_fetch_assoc($result)) {
$secret = $row[$parms['secret_column']?$parms['secret_column']:'secret'];
$context_id = $row[$parms['context_column']?$parms['context_column']:'context_id'];
if ( $context_id ) $this->context_id = $context_id;
$this->row = $row;
break;
}
if ( ! is_string($secret) ) {
$this->message = "Could not retrieve secret oauth_consumer_key=".$oauth_consumer_key;
return;
}
}
}
// Verify the message signature
$store = new TrivialOAuthDataStore();
$store->add_consumer($oauth_consumer_key, $secret);
$server = new OAuthServer($store);
$method = new OAuthSignatureMethod_HMAC_SHA1();
$server->add_signature_method($method);
$request = OAuthRequest::from_request();
$this->basestring = $request->get_signature_base_string();
try {
$server->verify_request($request);
$this->valid = true;
} catch (Exception $e) {
$this->message = $e->getMessage();
return;
}
// Store the launch information in the session for later
$newinfo = array();
foreach($_POST as $key => $value ) {
if ( $key == "basiclti_submit" ) continue;
if ( strpos($key, "oauth_") === false ) {
$newinfo[$key] = $value;
continue;
}
if ( $key == "oauth_consumer_key" ) {
$newinfo[$key] = $value;
continue;
}
}
$this->info = $newinfo;
if ( $usesession == true and strlen(session_id()) > 0 ) {
$_SESSION['_lti_context'] = $this->info;
unset($_SESSION['_lti_row']);
unset($_SESSION['_lti_context_id']);
if ( $this->row ) $_SESSION['_lti_row'] = $this->row;
if ( $this->context_id ) $_SESSION['_lti_context_id'] = $this->context_id;
}
if ( $this->valid && $doredirect ) {
$this->redirect();
$this->complete = true;
}
}
function addSession($location) {
if ( ini_get('session.use_cookies') == 0 ) {
if ( strpos($location,'?') > 0 ) {
$location = $location . '&';
} else {
$location = $location . '?';
}
$location = $location . session_name() . '=' . session_id();
}
return $location;
}
function isInstructor() {
$roles = $this->info['roles'];
$roles = strtolower($roles);
if ( ! ( strpos($roles,"instructor") === false ) ) return true;
if ( ! ( strpos($roles,"administrator") === false ) ) return true;
return false;
}
function getUserEmail() {
$email = $this->info['lis_person_contact_email_primary'];
if ( strlen($email) > 0 ) return $email;
# Sakai Hack
$email = $this->info['lis_person_contact_emailprimary'];
if ( strlen($email) > 0 ) return $email;
return false;
}
function getUserShortName() {
$email = $this->getUserEmail();
$givenname = $this->info['lis_person_name_given'];
$familyname = $this->info['lis_person_name_family'];
$fullname = $this->info['lis_person_name_full'];
if ( strlen($email) > 0 ) return $email;
if ( strlen($givenname) > 0 ) return $givenname;
if ( strlen($familyname) > 0 ) return $familyname;
return $this->getUserName();
}
function getUserName() {
$givenname = $this->info['lis_person_name_given'];
$familyname = $this->info['lis_person_name_family'];
$fullname = $this->info['lis_person_name_full'];
if ( strlen($fullname) > 0 ) return $fullname;
if ( strlen($familyname) > 0 and strlen($givenname) > 0 ) return $givenname + $familyname;
if ( strlen($givenname) > 0 ) return $givenname;
if ( strlen($familyname) > 0 ) return $familyname;
return $this->getUserEmail();
}
// Name spaced
function getUserKey() {
$oauth = $this->info['oauth_consumer_key'];
$id = $this->info['user_id'];
if ( strlen($id) > 0 and strlen($oauth) > 0 ) return $oauth . ':' . $id;
return false;
}
// Un-Namespaced
function getUserLKey() {
$id = $this->info['user_id'];
if ( strlen($id) > 0 ) return $id;
return false;
}
function setUserID($new_id) {
$this->user_id = $new_id;
}
function getUserID() {
return $this->user_id;
}
function getUserImage() {
$image = $this->info['user_image'];
if ( strlen($image) > 0 ) return $image;
$email = $this->getUserEmail();
if ( $email === false ) return false;
$size = 40;
$grav_url = $_SERVER['HTTPS'] ? 'https://' : 'http://';
$grav_url = $grav_url . "www.gravatar.com/avatar.php?gravatar_id=".md5( strtolower($email) )."&size=".$size;
return $grav_url;
}
function getResourceKey() {
$oauth = $this->info['oauth_consumer_key'];
$id = $this->info['resource_link_id'];
if ( strlen($id) > 0 and strlen($oauth) > 0 ) return $oauth . ':' . $id;
return false;
}
function getResourceLKey() {
$id = $this->info['resource_link_id'];
if ( strlen($id) > 0 ) return $id;
return false;
}
function setResourceID($new_id) {
$this->resource_id = $new_id;
}
function getResourceID() {
return $this->resource_id;
}
function getResourceTitle() {
$title = $this->info['resource_link_title'];
if ( strlen($title) > 0 ) return $title;
return false;
}
function getConsumerKey() {
$oauth = $this->info['oauth_consumer_key'];
return $oauth;
}
function setConsumerID($new_id) {
$this->consumer_id = $new_id;
}
function getConsumerID() {
return $this->consumer_id;
}
function getCourseLKey() {
if ( $this->context_id ) return $this->context_id;
$id = $this->info['context_id'];
if ( strlen($id) > 0 ) return $id;
return false;
}
function getCourseKey() {
if ( $this->context_id ) return $this->context_id;
$oauth = $this->info['oauth_consumer_key'];
$id = $this->info['context_id'];
if ( strlen($id) > 0 and strlen($oauth) > 0 ) return $oauth . ':' . $id;
return false;
}
function setCourseID($new_id) {
$this->course_id = $new_id;
}
function getCourseID() {
return $this->course_id;
}
function getCourseName() {
$label = $this->info['context_label'];
$title = $this->info['context_title'];
$id = $this->info['context_id'];
if ( strlen($label) > 0 ) return $label;
if ( strlen($title) > 0 ) return $title;
if ( strlen($id) > 0 ) return $id;
return false;
}
function getCSS() {
$list = $this->info['launch_presentation_css_url'];
if ( strlen($list) < 1 ) return array();
return explode(',',$list);
}
function getReturnURL() {
$url = $this->info['launch_presentation_return_url'];
if ( strlen($url) > 0 ) return $url;
return false;
}
function getOutcomeService() {
$retval = $this->info['lis_outcome_service_url'];
if ( strlen($retval) > 1 ) return $retval;
return false;
}
function getOutcomeSourceDID() {
$retval = $this->info['lis_result_sourcedid'];
if ( strlen($retval) > 1 ) return $retval;
return false;
}
function redirect($url=false) {
if ( $url === false ) {
$host = $_SERVER['HTTP_HOST'];
$uri = $_SERVER['PHP_SELF'];
$location = $_SERVER['HTTPS'] ? 'https://' : 'http://';
$location = $location . $host . $uri;
} else {
$location = $url;
}
if ( headers_sent() ) {
echo('<a href="'.htmlentities($location).'">Continue</a>'."\n");
} else {
$location = htmlentities($this->addSession($location));
header("Location: $location");
}
}
function dump() {
if ( ! $this->valid or $this->info == false ) return "Context not valid\n";
$ret = "";
if ( $this->isInstructor() ) {
$ret .= "isInstructor() = true\n";
} else {
$ret .= "isInstructor() = false\n";
}
$ret .= "getConsumerKey() = ".$this->getConsumerKey()."\n";
$ret .= "getUserLKey() = ".$this->getUserLKey()."\n";
$ret .= "getUserKey() = ".$this->getUserKey()."\n";
$ret .= "getUserID() = ".$this->getUserID()."\n";
$ret .= "getUserEmail() = ".$this->getUserEmail()."\n";
$ret .= "getUserShortName() = ".$this->getUserShortName()."\n";
$ret .= "getUserName() = ".$this->getUserName()."\n";
$ret .= "getUserImage() = ".$this->getUserImage()."\n";
$ret .= "getResourceKey() = ".$this->getResourceKey()."\n";
$ret .= "getResourceID() = ".$this->getResourceID()."\n";
$ret .= "getResourceTitle() = ".$this->getResourceTitle()."\n";
$ret .= "getCourseName() = ".$this->getCourseName()."\n";
$ret .= "getCourseKey() = ".$this->getCourseKey()."\n";
$ret .= "getCourseID() = ".$this->getCourseID()."\n";
$ret .= "getOutcomeSourceDID() = ".$this->getOutcomeSourceDID()."\n";
$ret .= "getOutcomeService() = ".$this->getOutcomeService()."\n";
return $ret;
}
}
/**
* A Trivial memory-based store - no support for tokens
*/
class TrivialOAuthDataStore extends OAuthDataStore {
private $consumers = array();
function add_consumer($consumer_key, $consumer_secret) {
$this->consumers[$consumer_key] = $consumer_secret;
}
function lookup_consumer($consumer_key) {
if ( strpos($consumer_key, "http://" ) === 0 ) {
$consumer = new OAuthConsumer($consumer_key,"secret", NULL);
return $consumer;
}
if ( $this->consumers[$consumer_key] ) {
$consumer = new OAuthConsumer($consumer_key,$this->consumers[$consumer_key], NULL);
return $consumer;
}
return NULL;
}
function lookup_token($consumer, $token_type, $token) {
return new OAuthToken($consumer, "");
}
// Return NULL if the nonce has not been used
// Return $nonce if the nonce was previously used
function lookup_nonce($consumer, $token, $nonce, $timestamp) {
// Should add some clever logic to keep nonces from
// being reused - for no we are really trusting
// that the timestamp will save us
return NULL;
}
function new_request_token($consumer) {
return NULL;
}
function new_access_token($token, $consumer) {
return NULL;
}
}
function signParameters($oldparms, $endpoint, $method, $oauth_consumer_key, $oauth_consumer_secret,
$submit_text = false, $org_id = false, $org_desc = false)
{
global $last_base_string;
$parms = $oldparms;
if ( ! isset($parms["lti_version"]) ) $parms["lti_version"] = "LTI-1p0";
if ( ! isset($parms["lti_message_type"]) ) $parms["lti_message_type"] = "basic-lti-launch-request";
if ( ! isset($parms["oauth_callback"]) ) $parms["oauth_callback"] = "about:blank";
if ( $org_id ) $parms["tool_consumer_instance_guid"] = $org_id;
if ( $org_desc ) $parms["tool_consumer_instance_description"] = $org_desc;
if ( $submit_text ) $parms["ext_submit"] = $submit_text;
$test_token = '';
$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
$test_consumer = new OAuthConsumer($oauth_consumer_key, $oauth_consumer_secret, NULL);
$acc_req = OAuthRequest::from_consumer_and_token($test_consumer, $test_token, $method, $endpoint, $parms);
$acc_req->sign_request($hmac_method, $test_consumer, $test_token);
// Pass this back up "out of band" for debugging
$last_base_string = $acc_req->get_signature_base_string();
$newparms = $acc_req->get_parameters();
// Don't want to pull GET parameters into POST data so
// manually pull back the oauth_ parameters
foreach($newparms as $k => $v ) {
if ( strpos($k, "oauth_") === 0 ) {
$parms[$k] = $v;
}
}
return $parms;
}
function postLaunchHTML($newparms, $endpoint, $debug=false, $iframeattr=false) {
global $last_base_string;
$r = "<div id=\"ltiLaunchFormSubmitArea\">\n";
if ( $iframeattr ) {
$r = "<form action=\"".$endpoint."\" name=\"ltiLaunchForm\" id=\"ltiLaunchForm\" method=\"post\" target=\"basicltiLaunchFrame\" encType=\"application/x-www-form-urlencoded\">\n" ;
} else {
$r = "<form action=\"".$endpoint."\" name=\"ltiLaunchForm\" id=\"ltiLaunchForm\" method=\"post\" encType=\"application/x-www-form-urlencoded\">\n" ;
}
$submit_text = $newparms['ext_submit'];
foreach($newparms as $key => $value ) {
$key = htmlspecialchars($key);
$value = htmlspecialchars($value);
if ( $key == "ext_submit" ) {
$r .= "<input type=\"submit\" name=\"";
} else {
$r .= "<input type=\"hidden\" name=\"";
}
$r .= $key;
$r .= "\" value=\"";
$r .= $value;
$r .= "\"/>\n";
}
if ( $debug ) {
$r .= "<script language=\"javascript\"> \n";
$r .= " //<![CDATA[ \n" ;
$r .= "function basicltiDebugToggle() {\n";
$r .= " var ele = document.getElementById(\"basicltiDebug\");\n";
$r .= " if(ele.style.display == \"block\") {\n";
$r .= " ele.style.display = \"none\";\n";
$r .= " }\n";
$r .= " else {\n";
$r .= " ele.style.display = \"block\";\n";
$r .= " }\n";
$r .= "} \n";
$r .= " //]]> \n" ;
$r .= "</script>\n";
$r .= "<a id=\"displayText\" href=\"javascript:basicltiDebugToggle();\">";
$r .= get_string("toggle_debug_data","basiclti")."</a>\n";
$r .= "<div id=\"basicltiDebug\" style=\"display:none\">\n";
$r .= "<b>".get_string("basiclti_endpoint","basiclti")."</b><br/>\n";
$r .= $endpoint . "<br/>\n <br/>\n";
$r .= "<b>".get_string("basiclti_parameters","basiclti")."</b><br/>\n";
foreach($newparms as $key => $value ) {
$key = htmlspecialchars($key);
$value = htmlspecialchars($value);
$r .= "$key = $value<br/>\n";
}
$r .= " <br/>\n";
$r .= "<p><b>".get_string("basiclti_base_string","basiclti")."</b><br/>\n".$last_base_string."</p>\n";
$r .= "</div>\n";
}
$r .= "</form>\n";
if ( $iframeattr ) {
$r .= "<iframe name=\"basicltiLaunchFrame\" id=\"basicltiLaunchFrame\" src=\"\"\n";
$r .= $iframeattr . ">\n<p>".get_string("frames_required","basiclti")."</p>\n</iframe>\n";
}
if ( ! $debug ) {
$ext_submit = "ext_submit";
$ext_submit_text = $submit_text;
$r .= " <script type=\"text/javascript\"> \n" .
" //<![CDATA[ \n" .
" document.getElementById(\"ltiLaunchForm\").style.display = \"none\";\n" .
" nei = document.createElement('input');\n" .
" nei.setAttribute('type', 'hidden');\n" .
" nei.setAttribute('name', '".$ext_submit."');\n" .
" nei.setAttribute('value', '".$ext_submit_text."');\n" .
" document.getElementById(\"ltiLaunchForm\").appendChild(nei);\n" .
" document.ltiLaunchForm.submit(); \n" .
" //]]> \n" .
" </script> \n";
}
$r .= "</div>\n";
return $r;
}
/* This is a bit of homage to Moodle's pattern of internationalisation */
function get_string($key,$bundle) {
return $key;
}
function do_post_request($url, $data, $optional_headers = null)
{
$params = array('http' => array(
'method' => 'POST',
'content' => $data
));
if ($optional_headers !== null) {
$header = $optional_headers . "\r\n";
}
// $header = $header . "Content-type: application/x-www-form-urlencoded\r\n";
$params['http']['header'] = $header;
$ctx = stream_context_create($params);
$fp = @fopen($url, 'rb', false, $ctx);
if (!$fp) {
throw new Exception("Problem with $url, $php_errormsg");
}
$response = @stream_get_contents($fp);
if ($response === false) {
throw new Exception("Problem reading data from $url, $php_errormsg");
}
return $response;
}
// Parse a descriptor
function launchInfo($xmldata) {
$xml = new SimpleXMLElement($xmldata);
if ( ! $xml ) {
echo("Error parsing Descriptor XML\n");
return;
}
$launch_url = $xml->secure_launch_url[0];
if ( ! $launch_url ) $launch_url = $xml->launch_url[0];
if ( $launch_url ) $launch_url = (string) $launch_url;
$custom = array();
if ( $xml->custom[0]->parameter )
foreach ( $xml->custom[0]->parameter as $resource) {
$key = (string) $resource['key'];
$key = strtolower($key);
$nk = "";
for($i=0; $i < strlen($key); $i++) {
$ch = substr($key,$i,1);
if ( $ch >= "a" && $ch <= "z" ) $nk .= $ch;
else if ( $ch >= "0" && $ch <= "9" ) $nk .= $ch;
else $nk .= "_";
}
$value = (string) $resource;
$custom["custom_".$nk] = $value;
}
return array("launch_url" => $launch_url, "custom" => $custom ) ;
}
function curPageURL() {
$pageURL = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
? 'http'
: 'https';
$pageURL .= "://";
$pageURL .= $_SERVER['HTTP_HOST'];
//$pageURL .= $_SERVER['REQUEST_URI'];
$pageURL .= $_SERVER['PHP_SELF'];
return $pageURL;
}
function getLastOAuthBodyBaseString() {
global $LastOAuthBodyBaseString;
return $LastOAuthBodyBaseString;
}
function getLastOAuthBodyHashInfo() {
global $LastOAuthBodyHashInfo;
return $LastOAuthBodyHashInfo;
}
function getOAuthKeyFromHeaders()
{
$request_headers = OAuthUtil::get_headers();
// print_r($request_headers);
if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
$header_parameters = OAuthUtil::split_header($request_headers['Authorization']);
// echo("HEADER PARMS=\n");
// print_r($header_parameters);
return $header_parameters['oauth_consumer_key'];
}
return false;
}
function handleOAuthBodyPOST($oauth_consumer_key, $oauth_consumer_secret)
{
$request_headers = OAuthUtil::get_headers();
// print_r($request_headers);
// Must reject application/x-www-form-urlencoded
if ($request_headers['Content-Type'] == 'application/x-www-form-urlencoded' ) {
throw new Exception("OAuth request body signing must not use application/x-www-form-urlencoded");
}
if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
$header_parameters = OAuthUtil::split_header($request_headers['Authorization']);
// echo("HEADER PARMS=\n");
// print_r($header_parameters);
$oauth_body_hash = $header_parameters['oauth_body_hash'];
// echo("OBH=".$oauth_body_hash."\n");
}
if ( ! isset($oauth_body_hash) ) {
throw new Exception("OAuth request body signing requires oauth_body_hash body");
}
// Verify the message signature
$store = new TrivialOAuthDataStore();
$store->add_consumer($oauth_consumer_key, $oauth_consumer_secret);
$server = new OAuthServer($store);
$method = new OAuthSignatureMethod_HMAC_SHA1();
$server->add_signature_method($method);
$request = OAuthRequest::from_request();
global $LastOAuthBodyBaseString;
$LastOAuthBodyBaseString = $request->get_signature_base_string();
// echo($LastOAuthBodyBaseString."\n");
try {
$server->verify_request($request);
} catch (Exception $e) {
$message = $e->getMessage();
throw new Exception("OAuth signature failed: " . $message);
}
$postdata = file_get_contents('php://input');
// echo($postdata);
$hash = base64_encode(sha1($postdata, TRUE));
global $LastOAuthBodyHashInfo;
$LastOAuthBodyHashInfo = "hdr_hash=$oauth_body_hash body_len=".strlen($postdata)." body_hash=$hash";
if ( $hash != $oauth_body_hash ) {
throw new Exception("OAuth oauth_body_hash mismatch");
}
return $postdata;
}
function sendOAuthBodyPOST($method, $endpoint, $oauth_consumer_key, $oauth_consumer_secret, $content_type, $body)
{
$hash = base64_encode(sha1($body, TRUE));
$parms = array('oauth_body_hash' => $hash);
$test_token = '';
$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
$test_consumer = new OAuthConsumer($oauth_consumer_key, $oauth_consumer_secret, NULL);
$acc_req = OAuthRequest::from_consumer_and_token($test_consumer, $test_token, $method, $endpoint, $parms);
$acc_req->sign_request($hmac_method, $test_consumer, $test_token);
// Pass this back up "out of band" for debugging
global $LastOAuthBodyBaseString;
$LastOAuthBodyBaseString = $acc_req->get_signature_base_string();
// echo($LastOAuthBodyBaseString."\n");
$header = $acc_req->to_header();
$header = $header . "\r\nContent-Type: " . $content_type . "\r\n";
$params = array('http' => array(
'method' => 'POST',
'content' => $body,
'header' => $header
));
$ctx = stream_context_create($params);
try {
$fp = @fopen($endpoint, 'r', false, $ctx);
} catch (Exception $e) {
$fp = false;
}
if ($fp) {
$response = @stream_get_contents($fp);
} else { // Try CURL
$headers = explode("\r\n",$header);
$response = sendXmlOverPost($endpoint, $body, $headers);
}
if ($response === false) {
throw new Exception("Problem reading data from $endpoint, $php_errormsg");
}
return $response;
}
function sendXmlOverPost($url, $xml, $header) {
if ( ! function_exists('curl_init') ) return false;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
// For xml, change the content-type.
curl_setopt ($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // ask for results to be returned
/*
if(CurlHelper::checkHttpsURL($url)) {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
}
*/
// Send to remote and return data to caller.
$result = curl_exec($ch);
curl_close($ch);
return $result;
}
/* $postBody = str_replace(
array('SOURCEDID', 'GRADE', 'OPERATION','MESSAGE'),
array($sourcedid, $_REQUEST['grade'], $operation, uniqid()),
getPOXGradeRequest());
*/
function getPOXGradeRequest() {
return '<?xml version = "1.0" encoding = "UTF-8"?>
<imsx_POXEnvelopeRequest xmlns = "http://www.imsglobal.org/services/ltiv1p1/xsd/imsoms_v1p0">
<imsx_POXHeader>
<imsx_POXRequestHeaderInfo>
<imsx_version>V1.0</imsx_version>
<imsx_messageIdentifier>MESSAGE</imsx_messageIdentifier>
</imsx_POXRequestHeaderInfo>
</imsx_POXHeader>
<imsx_POXBody>
<OPERATION>
<resultRecord>
<sourcedGUID>
<sourcedId>SOURCEDID</sourcedId>
</sourcedGUID>
<result>
<resultScore>
<language>en-us</language>
<textString>GRADE</textString>
</resultScore>
</result>
</resultRecord>
</OPERATION>
</imsx_POXBody>
</imsx_POXEnvelopeRequest>';
}
/* $postBody = str_replace(
array('SOURCEDID', 'OPERATION','MESSAGE'),
array($sourcedid, $operation, uniqid()),
getPOXRequest());
*/
function getPOXRequest() {
return '<?xml version = "1.0" encoding = "UTF-8"?>
<imsx_POXEnvelopeRequest xmlns = "http://www.imsglobal.org/services/ltiv1p1/xsd/imsoms_v1p0">
<imsx_POXHeader>
<imsx_POXRequestHeaderInfo>
<imsx_version>V1.0</imsx_version>
<imsx_messageIdentifier>MESSAGE</imsx_messageIdentifier>
</imsx_POXRequestHeaderInfo>
</imsx_POXHeader>
<imsx_POXBody>
<OPERATION>
<resultRecord>
<sourcedGUID>
<sourcedId>SOURCEDID</sourcedId>
</sourcedGUID>
</resultRecord>
</OPERATION>
</imsx_POXBody>
</imsx_POXEnvelopeRequest>';
}
/* sprintf(getPOXResponse(),uniqid(),'success', "Score read successfully",$message_ref,$body);
*/
function getPOXResponse() {
return '<?xml version="1.0" encoding="UTF-8"?>
<imsx_POXEnvelopeResponse xmlns="http://www.imsglobal.org/services/ltiv1p1/xsd/imsoms_v1p0">
<imsx_POXHeader>
<imsx_POXResponseHeaderInfo>
<imsx_version>V1.0</imsx_version>
<imsx_messageIdentifier>%s</imsx_messageIdentifier>
<imsx_statusInfo>
<imsx_codeMajor>%s</imsx_codeMajor>
<imsx_severity>status</imsx_severity>
<imsx_description>%s</imsx_description>
<imsx_messageRefIdentifier>%s</imsx_messageRefIdentifier>
</imsx_statusInfo>
</imsx_POXResponseHeaderInfo>
</imsx_POXHeader>
<imsx_POXBody>%s
</imsx_POXBody>
</imsx_POXEnvelopeResponse>';
}
function replaceResultRequest($grade, $sourcedid, $endpoint, $oauth_consumer_key, $oauth_consumer_secret) {
$method="POST";
$content_type = "application/xml";
$operation = 'replaceResultRequest';
$postBody = str_replace(
array('SOURCEDID', 'GRADE', 'OPERATION','MESSAGE'),
array($sourcedid, $grade, $operation, uniqid()),
getPOXGradeRequest());
$response = sendOAuthBodyPOST($method, $endpoint, $oauth_consumer_key, $oauth_consumer_secret, $content_type, $postBody);
return parseResponse($response);
}
function parseResponse($response) {
$retval = Array();
try {
$xml = new SimpleXMLElement($response);
$imsx_header = $xml->imsx_POXHeader->children();
$parms = $imsx_header->children();
$status_info = $parms->imsx_statusInfo;
$retval['imsx_codeMajor'] = (string) $status_info->imsx_codeMajor;
$retval['imsx_severity'] = (string) $status_info->imsx_severity;
$retval['imsx_description'] = (string) $status_info->imsx_description;
$retval['imsx_messageIdentifier'] = (string) $parms->imsx_messageIdentifier;
$imsx_body = $xml->imsx_POXBody->children();
$operation = $imsx_body->getName();
$retval['response'] = $operation;
$parms = $imsx_body->children();
} catch (Exception $e) {
throw new Exception('Error: Unable to parse XML response' . $e->getMessage());
}
if ( $operation == 'readResultResponse' ) {
try {
$retval['language'] =(string) $parms->result->resultScore->language;
$retval['textString'] = (string) $parms->result->resultScore->textString;
} catch (Exception $e) {
throw new Exception("Error: Body parse error: ".$e->getMessage());
}
}
return $retval;
}
?>