initial

1 files changed, 59 insertions, 0 deletions

diff --git a/src/web/helpers/auth.php b/src/web/helpers/auth.php
new file mode 100644
index 0000000..7aa4aff
--- /dev/null
+++ b/src/web/helpers/auth.php
@@ -0,0 +1,59 @@
+<?php /* Copyright (c) 2024 Freya Murphy */
+
+$keys = array();
+
+function load_key($key) {
+	$file = "/tmp/$key";
+	if (!file_exists($file))
+		return FALSE;
+	$content = explode("\n", file_get_contents($file));
+	return array(
+		'user' => $content[0],
+		'time' => $content[1]
+	);
+}
+
+function store_key($key, $user) {
+	$file = "/tmp/$key";
+	$now = (string)time();
+	$content = "$user\n{$now}";
+	file_put_contents($file, $content, LOCK_EX);
+}
+
+function get_random($n)
+{
+    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    $randomString = '';
+
+    for ($i = 0; $i < $n; $i++) {
+        $index = rand(0, strlen($characters) - 1);
+        $randomString .= $characters[$index];
+    }
+
+    return $randomString;
+}
+
+function key_auth() {
+	if (!isset($_SESSION['auth'])) {
+		return FALSE;
+	}
+	$key = $_SESSION['auth'];
+	$data = load_key($key);
+	if ($data === FALSE) {
+		return FALSE;
+	}
+	$user = $data['user'];
+	$time = $data['time'];
+	$now = time();
+	if ($time > $now || $now - $time > 60 * 60 * 24) {
+		return FALSE;
+	}
+	store_key($key, $user);
+	return  $user;
+}
+
+function key_new($user) {
+	$key = get_random(128);
+	store_key($key, $user);
+	$_SESSION['auth'] = $key;
+}