/**
* Perform the result of an action.
*
* This function may redirect the user to another URL rather than returning a value.
*
* @return string Output to be displayed (redirection, or display HTML or message)
*/
private function result()
{
$ok = false;
if (!$this->ok) {
$ok = $this->onError();
}
if (!$ok) {
if (!$this->ok) {
// If not valid, return an error message to the tool consumer if a return URL is provided
if (!empty($this->returnUrl)) {
$errorUrl = $this->returnUrl;
if (strpos($errorUrl, '?') === false) {
$errorUrl .= '?';
} else {
$errorUrl .= '&';
}
if ($this->debugMode && !is_null($this->reason)) {
$errorUrl .= 'lti_errormsg=' . urlencode("Debug error: {$this->reason}");
} else {
$errorUrl .= 'lti_errormsg=' . urlencode($this->message);
if (!is_null($this->reason)) {
$errorUrl .= '<i_errorlog=' . urlencode("Debug error: {$this->reason}");
}
}
if (!is_null($this->consumer) && isset($_POST['lti_message_type']) && $_POST['lti_message_type'] === 'ContentItemSelectionRequest') {
$formParams = array();
if (isset($_POST['data'])) {
$formParams['data'] = $_POST['data'];
}
$version = isset($_POST['lti_version']) ? $_POST['lti_version'] : self::LTI_VERSION1;
$formParams = $this->consumer->signParameters($errorUrl, 'ContentItemSelection', $version, $formParams);
$page = self::sendForm($errorUrl, $formParams);
echo $page;
} else {
header("Location: {$errorUrl}");
}
exit;
} else {
if (!is_null($this->errorOutput)) {
echo $this->errorOutput;
} else {
if ($this->debugMode && !empty($this->reason)) {
echo "Debug error: {$this->reason}";
} else {
echo "Error: {$this->message}";
}
}
}
} else {
if (!is_null($this->redirectUrl)) {
header("Location: {$this->redirectUrl}");
exit;
} else {
if (!is_null($this->output)) {
echo $this->output;
}
}
}
}
}
