Created an EmptyIpLocationResolver which always returns an empty resolution and can be used as a fallback while resolving IP addresses

module/Common/config/dependencies.config.php

@@ -37,6 +37,7 @@ return [
 
             IpGeolocation\IpApiLocationResolver::class => ConfigAbstractFactory::class,
             IpGeolocation\GeoLite2LocationResolver::class => ConfigAbstractFactory::class,
+            IpGeolocation\EmptyIpLocationResolver::class => InvokableFactory::class,
             IpGeolocation\ChainIpLocationResolver::class => ConfigAbstractFactory::class,
             IpGeolocation\GeoLite2\GeoLite2Options::class => ConfigAbstractFactory::class,
             IpGeolocation\GeoLite2\DbUpdater::class => ConfigAbstractFactory::class,
@@ -83,6 +84,7 @@ return [
         IpGeolocation\ChainIpLocationResolver::class => [
             IpGeolocation\GeoLite2LocationResolver::class,
             IpGeolocation\IpApiLocationResolver::class,
+            IpGeolocation\EmptyIpLocationResolver::class,
         ],
         IpGeolocation\GeoLite2\GeoLite2Options::class => ['config.geolite2'],
         IpGeolocation\GeoLite2\DbUpdater::class => [

module/Common/src/IpGeolocation/ChainIpLocationResolver.php

@@ -18,8 +18,6 @@ class ChainIpLocationResolver implements IpLocationResolverInterface
     }
 
     /**
-     * @param string $ipAddress
-     * @return array
      * @throws WrongIpException
      */
     public function resolveIpLocation(string $ipAddress): array

module/Common/src/IpGeolocation/EmptyIpLocationResolver.php

@@ -0,0 +1,25 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Common\IpGeolocation;
+
+use Shlinkio\Shlink\Common\Exception\WrongIpException;
+
+class EmptyIpLocationResolver implements IpLocationResolverInterface
+{
+    /**
+     * @throws WrongIpException
+     */
+    public function resolveIpLocation(string $ipAddress): array
+    {
+        return [
+            'country_code' => '',
+            'country_name' => '',
+            'region_name' => '',
+            'city' => '',
+            'latitude' => '',
+            'longitude' => '',
+            'time_zone' => '',
+        ];
+    }
+}

module/Common/src/IpGeolocation/GeoLite2LocationResolver.php

@@ -24,8 +24,6 @@ class GeoLite2LocationResolver implements IpLocationResolverInterface
     }
 
     /**
-     * @param string $ipAddress
-     * @return array
      * @throws WrongIpException
      */
     public function resolveIpLocation(string $ipAddress): array

module/Common/src/IpGeolocation/IpApiLocationResolver.php

@@ -25,8 +25,6 @@ class IpApiLocationResolver implements IpLocationResolverInterface
     }
 
     /**
-     * @param string $ipAddress
-     * @return array
      * @throws WrongIpException
      */
     public function resolveIpLocation(string $ipAddress): array

module/Common/src/IpGeolocation/IpLocationResolverInterface.php

@@ -8,8 +8,6 @@ use Shlinkio\Shlink\Common\Exception\WrongIpException;
 interface IpLocationResolverInterface
 {
     /**
-     * @param string $ipAddress
-     * @return array
      * @throws WrongIpException
      */
     public function resolveIpLocation(string $ipAddress): array;

module/Common/test/IpGeolocation/EmptyIpLocationResolverTest.php

@@ -0,0 +1,51 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\Common\IpGeolocation;
+
+use PHPUnit\Framework\TestCase;
+use Shlinkio\Shlink\Common\IpGeolocation\EmptyIpLocationResolver;
+use Shlinkio\Shlink\Common\Util\StringUtilsTrait;
+use function Functional\map;
+use function range;
+
+class EmptyIpLocationResolverTest extends TestCase
+{
+    use StringUtilsTrait;
+
+    private const EMPTY_RESP = [
+        'country_code' => '',
+        'country_name' => '',
+        'region_name' => '',
+        'city' => '',
+        'latitude' => '',
+        'longitude' => '',
+        'time_zone' => '',
+    ];
+
+    /**
+     * @var EmptyIpLocationResolver
+     */
+    private $resolver;
+
+    public function setUp()
+    {
+        $this->resolver = new EmptyIpLocationResolver();
+    }
+
+    /**
+     * @test
+     * @dataProvider provideEmptyResponses
+     */
+    public function alwaysReturnsAnEmptyResponse(array $expected, string $ipAddress)
+    {
+        $this->assertEquals($expected, $this->resolver->resolveIpLocation($ipAddress));
+    }
+
+    public function provideEmptyResponses(): array
+    {
+        return map(range(0, 5), function () {
+            return [self::EMPTY_RESP, $this->generateRandomString(10)];
+        });
+    }
+}