ResetPassword: add time-out to password resets; prevent repeated mails

models/Authentication.php

@@ -12,6 +12,8 @@
  */
 class Authentication
 {
+	const DEFAULT_RESET_TIMEOUT = 30;
+
 	/**
 	 * Checks a password for a given username against the database.
 	 */
@@ -57,6 +59,27 @@ class Authentication
 		return $hash;
 	}
 
+	public static function consumeResetKey($id_user)
+	{
+		return Registry::get('db')->query('
+			UPDATE users
+			SET reset_key = NULL,
+				reset_blocked_until = NULL
+			WHERE id_user = {int:id_user}',
+			['id_user' => $id_user]);
+	}
+
+	public static function getResetTimeOut($id_user)
+	{
+		$resetTime = Registry::get('db')->queryValue('
+			SELECT reset_blocked_until
+			FROM users
+			WHERE id_user = {int:id_user}',
+			['id_user' => $id_user]);
+
+		return max(0, $resetTime - time());
+	}
+
 	/**
 	 * Verifies whether the user is currently logged in.
 	 */
@@ -92,7 +115,8 @@ class Authentication
 	{
 		return Registry::get('db')->query('
 			UPDATE users
-			SET reset_key = {string:key}
+			SET reset_key = {string:key},
+				reset_blocked_until = UNIX_TIMESTAMP() + ' . static::DEFAULT_RESET_TIMEOUT . '
 			WHERE id_user = {int:id}',
 			[
 				'id' => $id_user,
@@ -117,4 +141,26 @@ class Authentication
 				'blank' => '',
 			]);
 	}
+
+	public static function updateResetTimeOut($id_user)
+	{
+		$currentResetTimeOut = static::getResetTimeOut($id_user);
+
+		// New timeout: between 30 seconds, double the current timeout, and a full day
+		$newResetTimeOut = min(max(static::DEFAULT_RESET_TIMEOUT, $currentResetTimeOut * 2), 60 * 60 * 24);
+
+		$success = Registry::get('db')->query('
+			UPDATE users
+			SET reset_blocked_until = {int:new_time_out}
+			WHERE id_user = {int:id_user}',
+			[
+				'id_user' => $id_user,
+				'new_time_out' => time() + $newResetTimeOut,
+			]);
+
+		if (!$success)
+			throw new UnexpectedValueException('Could not set password reset timeout!');
+
+		return $newResetTimeOut;
+	}
 }