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config/lib/loginManager/lmUtils.php

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+<?php
+/**
+ * loginManager/lmUtils.php
+ * @desc utilities for correct functioning
+ * @version 1.0
+ * @author Fándly Gergő Zoltán
+ * @copy 2017 Fándly Gergő Zoltán
+ */
+
+class lmUtils{
+    /**
+     * generate a random string with special character
+     * @param int $length length of the requested string
+     * @return string
+     */
+    public static function randomString($length){
+        $charset="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~!@#$%^&*()_-=+\?/.>,<";
+        $charsetLength=strlen($charset);
+        $string="";
+        for($i=0; $i<$length; $i++){
+            $string.=$charset[rand(0, $charsetLength-1)];
+        }
+        return $string;
+    }
+    
+    /**
+     * validate google ReCaptcha
+     * @param string $secretkey secret key to captcha API
+     * @param string $response response of API
+     * @return bool
+     */
+    public static function validateCaptcha($secretkey, $response){
+        $verify=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$secretkey."&response=".$response);
+        $data=json_decode($verify);
+        if($data->success){
+            return true;
+        }
+        else{
+            return false;
+        }
+    }
+}
+
+?>