<!doctype html>
<?php
session_start();
require_once("lib/parsedown/Parsedown.php");
require_once("lib/lti/lti_util.php");
require_once("settings.php");
function debug($message, $variable, $pail_debug) {
if ($pail_debug) {
if ($message) {
echo $message . " ";
}
if (!is_null($variable)) {
var_dump($variable);
}
echo "<br />";
}
}
?>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><?php echo $pail_title; ?></title>
<meta name="description" content="<?php echo $pail_description; ?>">
<meta name="author" content="PAIL">
<link rel="icon" href="favicon.ico">
<link rel="apple-touch-icon" href="apple-touch-icon.png">
<link rel="stylesheet" href="lib/github-markdown-css/github-markdown.css">
</head>
<body class="markdown-body">
<?php
debug("Starting...", null, $pail_debug);
// Check if this is a valid LTI request
$valid_lti_request = is_lti_request();
debug("Valid LTI request:", $valid_lti_request, $pail_debug);
if ($valid_lti_request) {
$oauth_consumer_key = "";
$oauth_consumer_secret = "";
if (isset($_POST["oauth_consumer_key"])) {
$oauth_consumer_key = $_POST["oauth_consumer_key"];
$oauth_consumer_secret = $pail_oauth_consumer_secret;
$_SESSION["oauth_consumer_key"] = $oauth_consumer_key;
$_SESSION["oauth_consumer_secret"] = $oauth_consumer_secret;
}
debug("oauth_consumer_key", $oauth_consumer_key, $pail_debug);
debug("oauth_consumer_secret", $oauth_consumer_secret, $pail_debug);
$context = new BLTI($oauth_consumer_secret, true, false);
// Ensure context is valid and context_id and user_id are alphanumeric only
$valid_lti_request = $context->valid
&& ctype_alnum($context->info[$pail_context_id]) && ctype_alnum($context->info[$pail_user_id]);
}
if (!$valid_lti_request) {
// If not a valid LTI request, display an error
debug("LTI message type should be 'basic-lti-launch-request'", $_REQUEST["lti_message_type"], $pail_debug);
debug("LTI version should be 'LTI-1p0'", $_REQUEST["lti_version"], $pail_debug);
debug("Ensure context id is alphanumeric only", $context->info[$pail_context_id], $pail_debug);
debug("Ensure user id is alphanumeric only", $context->info[$pail_user_id], $pail_debug);
debug("Invalid LTI context", $context, $pail_debug);
require("error_templates/not_lti.php");
} else {
debug("LTI Context: ", $context, $pail_debug);
// Determine name of file to display
$pail_dirname = getcwd() . DIRECTORY_SEPARATOR .
$pail_generated_dir . DIRECTORY_SEPARATOR .
$context->info[$pail_context_id] . DIRECTORY_SEPARATOR .
$context->info[$pail_user_id] . DIRECTORY_SEPARATOR;
// Default to display.md unless another file is requested
$pail_filename = isset($_REQUEST["display"]) ? $_REQUEST["display"] : "display.md";
$pail_filename = $pail_dirname . $pail_filename;
debug("pail_filename:", $pail_filename, $pail_debug);
debug("pail_reset:", $pail_reset, $pail_debug);
debug("pail_filename exists: " . file_exists($pail_filename), null, $pail_debug);
// Generate file if necessary
if ($pail_reset || !file_exists($pail_filename)) {
debug("Generating:", $pail_filename, $pail_debug);
$output = null;
$retval = null;
$pail_command = "./generate.sh " .
"-c \"" . $context->info[$pail_context_id] . "\"" . " ".
"-u \"" . $context->info[$pail_user_id] . "\" " .
$pail_generate_command;
debug("Executing:", $pail_command, $pail_debug);
exec($pail_command, $output, $retval);
debug("Output:", $output, $pail_debug);
debug("retval", $retval, $pail_debug);
}
// Attempt to read the file
$file_contents = false;
if (file_exists($pail_filename)) {
$file_contents = file_get_contents($pail_filename);
}
if ($file_contents === false) {
// Display error if unable to read file
debug("Unable to read file:", $file_contents, $pail_debug);
require("error_templates/file_unavailable.php");
// Display file
} else {
echo Parsedown::instance()->text($file_contents) . "\n";
}
}
debug("Finished", null, $pail_debug);
?>
<footer><small>Generated by <a href="https://gitlab.une.edu.au/dpaul4/pail">PAIL</a></small></footer>
<script>
document.querySelectorAll('a[href^="http"]').forEach(link => {
link.setAttribute('target', '_blank');
link.setAttribute('rel', 'noopener');
});
</script>
</body>
</html>