Add API to list merge request diff versions

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/api/merge_request_diffs.rb b/lib/api/merge_request_diffs.rb
new file mode 100644
index 00000000000..4bd149d1603
--- /dev/null
+++ b/lib/api/merge_request_diffs.rb
@@ -0,0 +1,25 @@
+module API
+  # MergeRequestDiff API
+  class MergeRequestDiffs < Grape::API
+    before { authenticate! }
+
+    resource :projects do
+      # List merge requests diff versions
+      #
+      # Parameters:
+      #   id (required)               - The ID of a project
+      #   merge_request_id (required) - The ID of MR
+      #
+      # Example:
+      #   GET /projects/:id/merge_requests/:merge_request_id/versions
+      #
+      get ":id/merge_requests/:merge_request_id/versions" do
+        merge_request = user_project.merge_requests.
+          find(params[:merge_request_id])
+
+        authorize! :read_merge_request, merge_request
+        present merge_request.merge_request_diffs, with: Entities::MergeRequestDiff
+      end
+    end
+  end
+end