feat: plugin "PredefinedLogin" which logs in with username/password p…

…redefined in server env vars

plugins/login-predefined.php

@@ -0,0 +1,19 @@
+<?php
+
+/** Login with predefined user set in env vars
+* @link https://www.adminer.org/plugins/#use
+* @author Rophy Tsai <[email protected]>
+* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
+*/
+class PredefinedLogin {
+
+	function credentials() {
+		return array(SERVER, $_ENV["ADMINER_PREDEFINED_USER"], $_ENV["ADMINER_PREDEFINED_PASSWORD"]);
+	}
+
+	function loginFormField($name, $heading, $value) {
+		if ($name == 'username' || $name == 'password') $value = 'Predefined <input type="hidden" name="auth['.$name.']" value="predefined">';
+		return $heading . $value;
+	}
+
+}