Add ability to specify the allowed URL schemes

README.md

@@ -51,6 +51,7 @@
         - [Custom Database Connection](#custom-database-connection)
         - [Specifying the Key Generator](#specifying-the-key-generator)
         - [Specifying the User Agent Parser](#specifying-the-user-agent-parser)
+        - [Specifying the Allowed URL Schemes](#specifying-the-allowed-url-schemes)
     - [Helper Methods](#helper-methods)
         - [Visits](#visits)
         - [Find by URL Key](#find-by-url-key)
@@ -632,6 +633,23 @@ To do this, you can define the class to be used in the `short-url.php` config fi
 
 You'll just need to ensure that your custom user agent parser class implements the `AshAllenDesign\ShortURL\Interfaces\UserAgentDriver` interface.
 
+#### Specifying the Allowed URL Schemes
+
+By default, Short URL will allow you to create a shortened URL for any URLs beginning with `http://` or `https://`.
+
+However, you may want to change this list of allowed URL schemes. For example, this may be to restrict the creation to only `https://` URLs. Or, it may be to allow URLs to be created using other schemes such as `mailto://` or even custom schemes for your own applications.
+
+To change the list of allowed URL schemes, you can define the list using the `allowed_url_schemes` field in your `short-url.php` config file like so:
+
+```php
+'allowed_url_schemes' => [
+    'http://',
+    'https://',
+    'mailto://',
+    'myapp://',
+],
+```
+
 ### Helper Methods
 #### Visits
 The ShortURL model includes a relationship (that you can use just like any other Laravel model relation) for getting the

config/short-url.php

@@ -105,6 +105,20 @@
     */
     'enforce_https' => true,
 
+    /*
+    |--------------------------------------------------------------------------
+    | Allowed URL Schemes
+    |--------------------------------------------------------------------------
+    |
+    | Here you may specify the allowed URL schemes to shorten. For example:
+    | 'mailto://', 'whatsapp://', 'yourapp://'.
+    |
+    */
+    'allowed_url_schemes' => [
+        'http://',
+        'https://',
+    ],
+
     /*
     |--------------------------------------------------------------------------
     | URL Length

src/Classes/Builder.php

@@ -181,8 +181,10 @@ public function routes(): void
      */
     public function destinationUrl(string $url): self
     {
-        if (! Str::startsWith($url, ['http://', 'https://'])) {
-            throw new ShortURLException('The destination URL must begin with http:// or https://');
+        $allowedPrefixes = config('short-url.allowed_url_schemes');
+
+        if (! Str::startsWith($url, config('short-url.allowed_url_schemes'))) {
+            throw new ShortURLException('The destination URL must begin with an allowed prefix: '.implode(', ', $allowedPrefixes));
         }
 
         $this->destinationUrl = $url;

src/Classes/Validation.php

@@ -32,6 +32,7 @@ public function validateConfig(): bool
                     Rule::make('enforce_https')->rules(['required', 'boolean']),
                     Rule::make('forward_query_params')->rules(['required', 'boolean']),
                     Rule::make('default_url')->rules(['nullable', 'string']),
+                    Rule::make('allowed_url_schemes')->rules(['required', 'array']),
                 ],
             ]);
 

tests/Unit/Classes/BuilderTest.php

@@ -42,7 +42,7 @@ public function exception_is_thrown_in_the_constructor_if_the_config_variables_a
     public function exception_is_thrown_if_the_destination_url_does_not_begin_with_http_or_https(): void
     {
         $this->expectException(ShortURLException::class);
-        $this->expectExceptionMessage('The destination URL must begin with http:// or https://');
+        $this->expectExceptionMessage('The destination URL must begin with an allowed prefix: http://, https://');
 
         $builder = app(Builder::class);
         $builder->destinationUrl('INVALID');
@@ -609,4 +609,28 @@ public function builder_works_when_the_date_facade_is_set_to_use_carbon_immutabl
 
         Date::useDefault();
     }
+
+    #[Test]
+    public function custom_url_schemes_allowed_if_configured(): void
+    {
+        Config::set('short-url.allowed_url_schemes', ['http://', 'https://', 'whatsapp://']);
+
+        $shortUrl = app(Builder::class)
+            ->destinationUrl('whatsapp://callMe')
+            ->make();
+
+        $this->assertSame('whatsapp://callMe', $shortUrl->destination_url);
+    }
+
+    #[Test]
+    public function exception_is_thrown_if_invalid_scheme(): void
+    {
+        Config::set('short-url.allowed_url_schemes', ['https://', 'whatsapp://']);
+
+        $this->expectException(ShortURLException::class);
+        $this->expectExceptionMessage('The destination URL must begin with an allowed prefix: https://, whatsapp://');
+
+        $builder = app(Builder::class);
+        $builder->destinationUrl('phpstorm://');
+    }
 }

tests/Unit/Classes/ValidationTest.php

@@ -129,4 +129,16 @@ public function exception_is_thrown_if_the_default_url_is_not_a_string(): void
         $validation = new Validation();
         $validation->validateConfig();
     }
+
+    #[Test]
+    public function exception_is_thrown_if_the_allowed_url_schemes_is_not_an_array(): void
+    {
+        $this->expectException(ValidationException::class);
+        $this->expectExceptionMessage('The short-url.allowed_url_schemes field must be an array.');
+
+        Config::set('short-url.allowed_url_schemes', 'INVALID');
+
+        $validation = new Validation();
+        $validation->validateConfig();
+    }
 }