Add a blacklist for urls

Author: gallib

config/shorturl.php

@@ -5,4 +5,9 @@
      | Number of items per page.
      */
     'items_per_page' => 10,
+
+    /*
+     | A list of non allowed keywords in url.
+     */
+    'blacklist' => [],
 ];

src/Http/Requests/UrlRequest.php

@@ -2,6 +2,7 @@
 
 namespace Gallib\ShortUrl\Http\Requests;
 
+use Gallib\ShortUrl\Rules\Blacklist;
 use Illuminate\Foundation\Http\FormRequest;
 
 class UrlRequest extends FormRequest
@@ -30,7 +31,7 @@ public function rules()
         }
 
         return [
-            'url'  => 'required|url',
+            'url'  => ['required', 'url', new Blacklist()],
             'code' => 'max:255'.$uniqueCode,
         ];
     }

src/Rules/Blacklist.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Gallib\ShortUrl\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class Blacklist implements Rule
+{
+    /**
+     * @var array
+     */
+
+    protected $blacklist = [];
+    /**
+     * Create a new rule instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        $this->blacklist = config('shorturl.blacklist');
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        return !str_contains($value, $this->blacklist);
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return 'This :attribute contains blacklisted keyword.';
+    }
+}