Add missing pagination on the commit diff endpoint

3 files changed, 10 insertions, 1 deletions

diff --git a/changelogs/unreleased/17203-add-missing-pagination-commit-diff-endpoint.yml b/changelogs/unreleased/17203-add-missing-pagination-commit-diff-endpoint.yml
new file mode 100644
index 00000000000..efd936ca104
--- /dev/null
+++ b/changelogs/unreleased/17203-add-missing-pagination-commit-diff-endpoint.yml
@@ -0,0 +1,5 @@
+---
+  title: Add missing pagination on the commit diff endpoint
+  merge_request: 17203
+  author: Maxime Roussin-Bélanger
+  type: fixed
diff --git a/lib/api/commits.rb b/lib/api/commits.rb
index d83c43ee49b..3d6e78d2d80 100644
--- a/lib/api/commits.rb
+++ b/lib/api/commits.rb
@@ -97,13 +97,16 @@ module API
       end
       params do
         requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
+        use :pagination
       end
       get ':id/repository/commits/:sha/diff', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         commit = user_project.commit(params[:sha])
 
         not_found! 'Commit' unless commit
 
-        present commit.raw_diffs.to_a, with: Entities::Diff
+        raw_diffs = ::Kaminari.paginate_array(commit.raw_diffs.to_a)
+
+        present paginate(raw_diffs), with: Entities::Diff
       end
 
       desc "Get a commit's comments" do
diff --git a/spec/requests/api/commits_spec.rb b/spec/requests/api/commits_spec.rb
index 31959d28fee..ad3eec88952 100644
--- a/spec/requests/api/commits_spec.rb
+++ b/spec/requests/api/commits_spec.rb
@@ -698,6 +698,7 @@ describe API::Commits do
         get api(route, current_user)
 
         expect(response).to have_gitlab_http_status(200)
+        expect(response).to include_pagination_headers
         expect(json_response.size).to be >= 1
         expect(json_response.first.keys).to include 'diff'
       end