Add FileExport API method

spec/Akeneo/Crowdin/Api/ExportFileSpec.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace spec\Akeneo\Crowdin\Api;
+
+use Akeneo\Crowdin\Client;
+use GuzzleHttp\Client as HttpClient;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+
+class ExportFileSpec extends ObjectBehavior
+{
+    public function let(Client $client, HttpClient $http)
+    {
+        $client->getHttpClient()->willReturn($http);
+        $client->getProjectIdentifier()->willReturn('akeneo');
+        $client->getProjectApiKey()->willReturn('1234');
+        $this->beConstructedWith($client);
+    }
+
+    public function it_should_be_an_api()
+    {
+        $this->shouldBeAnInstanceOf('Akeneo\Crowdin\Api\AbstractApi');
+    }
+
+    public function it_retrieves_translation_file(HttpClient $http, Request $request, Response $response)
+    {
+        $content = 'file-content';
+        $response->getBody()->willReturn($content);
+        $http->get('project/akeneo/export-file?key=1234')->willReturn($response);
+        $this->execute()->shouldBe($content);
+    }
+}

src/Akeneo/Crowdin/Api/ExportFile.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Akeneo\Crowdin\Api;
+
+/**
+ * This method exports single translated files from Crowdin.
+ *
+ * @author Markus Weiland <markus.weiland@mapudo.com>
+ * @see https://support.crowdin.com/api/export-file/
+ */
+class ExportFile extends AbstractApi
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function execute()
+    {
+        $this->addUrlParameter('key', $this->client->getProjectApiKey());
+
+        $path = sprintf(
+            "project/%s/export-file?%s",
+            $this->client->getProjectIdentifier(),
+            $this->getUrlQueryString()
+        );
+        $response = $this->client->getHttpClient()->get($path);
+
+        return $response->getBody();
+    }
+}

src/Akeneo/Crowdin/Client.php

@@ -71,6 +71,9 @@ public function api($method)
             case 'export':
                 $api = new Api\Export($this);
                 break;
+            case 'export-file':
+                $api = new Api\ExportFile($this);
+                break;
             case 'add-directory':
                 $api = new Api\AddDirectory($this);
                 break;