Add v2/tokeninfo endpoint support

src/GW2Api.php

@@ -15,6 +15,7 @@
 use GW2Treasures\GW2Api\V2\Endpoint\Quaggan\QuagganEndpoint;
 use GW2Treasures\GW2Api\V2\Endpoint\Recipe\RecipeEndpoint;
 use GW2Treasures\GW2Api\V2\Endpoint\Skin\SkinEndpoint;
+use GW2Treasures\GW2Api\V2\Endpoint\Tokeninfo\TokeninfoEndpoint;
 use GW2Treasures\GW2Api\V2\Endpoint\World\WorldEndpoint;
 use GW2Treasures\GW2Api\V2\IEndpoint;
 
@@ -124,6 +125,10 @@ public function skins() {
         return new SkinEndpoint( $this );
     }
 
+    public function tokeninfo( $apiKey ) {
+        return new TokeninfoEndpoint( $this, $apiKey );
+    }
+
     public function worlds() {
         return new WorldEndpoint( $this );
     }

src/V2/Endpoint/Tokeninfo/TokeninfoEndpoint.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace GW2Treasures\GW2Api\V2\Endpoint\Tokeninfo;
+
+use GW2Treasures\GW2Api\GW2Api;
+use GW2Treasures\GW2Api\V2\Endpoint;
+use GW2Treasures\GW2Api\V2\Authentication\AuthenticatedEndpoint;
+use GW2Treasures\GW2Api\V2\Authentication\IAuthenticatedEndpoint;
+
+class TokeninfoEndpoint extends Endpoint implements IAuthenticatedEndpoint {
+    use AuthenticatedEndpoint;
+
+    public function __construct( GW2Api $api, $apiKey ) {
+        parent::__construct( $api );
+
+        $this->apiKey = $apiKey;
+    }
+
+
+    /**
+     * @inheritdoc
+     */
+    protected function url() {
+        return 'v2/tokeninfo';
+    }
+
+    /**
+     * Get info about the used api key.
+     *
+     * @return mixed
+     */
+    public function get() {
+        return $this->request()->json();
+    }
+}

tests/V2/TokeninfoEndpointTest.php

@@ -0,0 +1,18 @@
+<?php
+
+class TokeninfoEndpointTest extends TestCase {
+    public function test() {
+        $this->mockResponse('{
+            "id": "017A2B0C-A6C5-CC4D-A055-680F427CE8FD",
+            "name": "public key",
+            "permissions": [
+                "account",
+                "characters"
+            ]
+        }');
+
+        $tokeninfo = $this->api()->tokeninfo('api_key')->get();
+        $this->assertEquals( 'public key', $tokeninfo->name );
+        $this->assertContains( 'characters', $tokeninfo->permissions );
+    }
+}