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编辑当前文件:/home2/sdektunc/www/cepali/enrol/lti/ims-blti/blti_util.php

<?php

require_once 'OAuth.php';

// Replace this with some real function that pulls from the LMS.
  function getLMSDummyData() {
    $parms = array(
      "resource_link_id" => "120988f929-274612",
      "resource_link_title" => "Weekly Blog",
      "resource_link_description" => "Each student needs to reflect on the weekly reading.  These should be one paragraph long.",
      "user_id" => "292832126",
      "roles" => "Instructor",  // or Learner
      "lis_person_name_full" => 'Jane Q. Public',
      "lis_person_contact_email_primary" => "user@school.edu",
      "lis_person_sourcedid" => "school.edu:user",
      "context_id" => "456434513",
      "context_title" => "Design of Personal Environments",
      "context_label" => "SI182",
      );

return $parms;
  }

function validateDescriptor($descriptor)
  {
    $xml = new SimpleXMLElement($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;
    return $launch_url;
  }

// 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 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();

return $newparms;
}

function signOnly($oldparms, $endpoint, $method, $oauth_consumer_key, $oauth_consumer_secret)
{
    global $last_base_string;
    $parms = $oldparms;

$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();

return $newparms;
}

/* This is a bit of homage to Moodle's pattern of internationalisation */
function get_stringIMS($key,$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) {
    echo @stream_get_contents($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;
}