triming settings values

lib/Models/Setting.php

@@ -2,6 +2,7 @@
 namespace MailPoet\Models;
 
 use MailPoet\Cron\CronTrigger;
+use MailPoet\Util\Helpers;
 
 if(!defined('ABSPATH')) exit;
 
@@ -106,6 +107,7 @@ class Setting extends Model {
   }
 
   public static function setValue($key, $value) {
+    $value = Helpers::recursiveTrim($value);
     $keys = explode('.', $key);
 
     if(count($keys) === 1) {

lib/Util/Helpers.php

@@ -87,4 +87,12 @@ class Helpers {
       : null;
   }
 
+  static function recursiveTrim($value) {
+    if(is_array($value))
+      return array_map([__CLASS__, 'recursiveTrim'], $value);
+    if(is_string($value))
+      return trim($value);
+    return $value;
+  }
+
 }

tests/unit/Util/HelpersTest.php

@@ -34,4 +34,27 @@ class HelpersTest extends \MailPoetTest {
     $json = json_encode(array('one' => 1, 'two' => 2));
     expect(Helpers::isJson($json))->true();
   }
+
+  function testItTrimStringsRecursively() {
+    expect(Helpers::recursiveTrim('  foo'))->equals('foo');
+    expect(Helpers::recursiveTrim('foo  '))->equals('foo');
+    expect(Helpers::recursiveTrim(123))->equals(123);
+    expect(Helpers::recursiveTrim([
+      'name' => '   some text here   ',
+      'list' => [
+        'string 1',
+        'string 2   ',
+        '  string 3   '
+      ],
+      'number' => 523
+    ]))->equals([
+      'name' => 'some text here',
+      'list' => [
+        'string 1',
+        'string 2',
+        'string 3'
+      ],
+      'number' => 523
+    ]);
+  }
 }