add valid base64 rule

Author: milwad-dev

src/Rules/ValidBase64.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Milwad\LaravelValidate\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class ValidBase64 implements Rule
+{
+    /**
+     * Check base64.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        return preg_match('/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/', $value);
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return __('valid.base64');
+    }
+}