added validator for validate_for_voice

Author: matthiez

src/Client.php

@@ -5,6 +5,7 @@
 use Sms77\Api\Validator\ContactsValidator;
 use Sms77\Api\Validator\LookupValidator;
 use Sms77\Api\Validator\SmsValidator;
+use Sms77\Api\Validator\ValidateForVoiceValidator;
 use Sms77\Api\Validator\VoiceValidator;
 
 class Client
@@ -81,14 +82,13 @@ function status($msgId)
         return $this->request("status", $options);
     }
 
-    /*TODO: add add validation*/
     function validateForVoice($number, array $extra = [])
     {
-        $required = [
+        $options = $this->buildOptions([
             "number" => $number,
-        ];
+        ], $extra);
 
-        $options = array_merge($required, $extra);
+        (new ValidateForVoiceValidator($options))->validate();
 
         return $this->request("validate_for_voice", $options);
     }

src/Validator/ValidateForVoiceValidator.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Sms77\Api\Validator;
+
+use Exception;
+
+class ValidateForVoiceValidator extends BaseValidator implements ValidatorInterface
+{
+    function __construct(array $parameters)
+    {
+        parent::__construct($parameters);
+    }
+
+    function validate()
+    {
+        $this->callback();
+        $this->number();
+    }
+
+    function callback()
+    {
+        $callback = isset($this->parameters["callback"]) ? $this->parameters["callback"] : null;
+
+        if (null !== $callback) {
+            if (filter_var($callback, FILTER_VALIDATE_URL)) {
+                throw new Exception("The optional parameter callback is not a valid URL.");
+            }
+        }
+    }
+
+    function number()
+    {
+        $number = isset($this->parameters["number"]) ? $this->parameters["number"] : null;
+
+        if (!strlen($number)) {
+            throw new Exception("The required parameter number is missing.");
+        }
+    }
+}