feat: Add the 'Download File Preview' API support (#98)

Author: IgorFroehner

lib/crowdin-api/api_resources/source_files.rb

@@ -267,6 +267,22 @@ def download_file(file_id = nil, destination = nil, project_id = config.project_
         Web::SendRequest.new(request, destination).perform
       end
 
+      # @param file_id [Integer] File ID
+      # @param destination [String] Destination of File
+      # * {https://developer.crowdin.com/api/v2/#operation/api.projects.files.preview.get API Documentation}
+      # * {https://developer.crowdin.com/enterprise/api/v2/#operation/api.projects.files.preview.get Enterprise API Documentation}
+      def download_file_preview(file_id = nil, destination = nil, project_id = config.project_id)
+        file_id     || raise_parameter_is_required_error(:file_id)
+        project_id  || raise_project_id_is_required_error
+
+        request = Web::Request.new(
+          connection,
+          :get,
+          "#{config.target_api_url}/projects/#{project_id}/files/#{file_id}/preview"
+        )
+        Web::SendRequest.new(request, destination).perform
+      end
+
       # @param query [Hash] Request Body
       # @param file_id [Integer] File ID
       # * {https://developer.crowdin.com/api/v2/#operation/api.projects.files.revisions.getMany API Documentation}

spec/api_resources/source_files_spec.rb

@@ -160,6 +160,16 @@
       end
     end
 
+    describe '#download_file_preview' do
+      let(:file_id) { 1 }
+
+      it 'when request are valid', :default do
+        stub_request(:get, "https://api.crowdin.com/#{target_api_url}/projects/#{project_id}/files/#{file_id}/preview")
+        download_file_preview = @crowdin.download_file_preview(file_id, nil, project_id)
+        expect(download_file_preview).to eq(200)
+      end
+    end
+
     describe '#list_file_revisions' do
       let(:file_id) { 1 }