1 files changed, 57 insertions, 0 deletions
diff --git a/lib/admin.php b/lib/admin.php
new file mode 100644
index 0000000..8b36b36
--- /dev/null
+++ b/lib/admin.php
@@ -0,0 +1,57 @@
+<?php
+
+class admin {
+
+    const SESSION_TIMEOUT = 86400 * 14;
+    const COOKIE_NAME = 'admin_key';
+
+    protected static ?bool $isAdmin = null;
+
+    public static function isAdmin(): bool {
+        if (is_null(self::$isAdmin))
+            self::$isAdmin = self::_verifyKey();
+        return self::$isAdmin;
+    }
+
+    protected static function _verifyKey(): bool {
+        if (isset($_COOKIE[self::COOKIE_NAME])) {
+            $cookie = (string)$_COOKIE[self::COOKIE_NAME];
+            if ($cookie !== self::getKey())
+                self::unsetCookie();
+            return true;
+        }
+        return false;
+    }
+
+    public static function checkPassword(string $pwd): bool {
+        return salt_password($pwd) === config::get('admin_pwd');
+    }
+
+    protected static function getKey(): string {
+        global $config;
+        $admin_pwd_hash = config::get('admin_pwd');
+        return salt_password("$admin_pwd_hash|{$_SERVER['REMOTE_ADDR']}");
+    }
+
+    public static function setCookie(): void {
+        global $config;
+        $key = self::getKey();
+        setcookie(self::COOKIE_NAME, $key, time() + self::SESSION_TIMEOUT, '/', $config['cookie_host']);
+    }
+
+    public static function unsetCookie(): void {
+        global $config;
+        setcookie(self::COOKIE_NAME, null, -1, '/', $config['cookie_host']);
+    }
+
+    public static function logAuth(): void {
+        getDb()->insert('admin_log', [
+            'ts' => time(),
+            'ip' => ip2ulong($_SERVER['REMOTE_ADDR']),
+            'ua' => $_SERVER['HTTP_USER_AGENT'] ?? '',
+        ]);
+    }
+
+
+}
+