Set content disposition attachment to several endpoints

app/controllers/profiles/keys_controller.rb

@@ -40,7 +40,8 @@ class Profiles::KeysController < Profiles::ApplicationController
       begin
         user = UserFinder.new(params[:username]).find_by_username
         if user.present?
-          render text: user.all_ssh_keys.join("\n"), content_type: "text/plain"
+          headers['Content-Disposition'] = 'attachment'
+          render text: user.all_ssh_keys.join("\n"), content_type: 'text/plain'
         else
           return render_404
         end

changelogs/unreleased/fj-force-content-disposition.yml

+---
+title: Force content disposition attachment to several endpoints
+merge_request: 23223
+author:
+type: other

lib/api/helpers.rb

@@ -494,6 +494,7 @@ module API
     def send_git_blob(repository, blob)
       env['api.format'] = :txt
       content_type 'text/plain'
+      header['Content-Disposition'] = "attachment; filename=#{blob.name.inspect}"
       header(*Gitlab::Workhorse.send_git_blob(repository, blob))
     end

lib/api/snippets.rb

@@ -146,6 +146,7 @@ module API
         env['api.format'] = :txt
         content_type 'text/plain'
+        header['Content-Disposition'] = 'attachment'
         present snippet.content
       end
       # rubocop: enable CodeReuse/ActiveRecord

spec/controllers/profiles/keys_controller_spec.rb

@@ -62,8 +62,15 @@ describe Profiles::KeysController do
       it "responds with text/plain content type" do
         get :get_keys, username: user.username
+
         expect(response.content_type).to eq("text/plain")
       end
+
+      it "responds with attachment content disposition" do
+        get :get_keys, username: user.username
+
+        expect(response.headers['Content-Disposition']).to eq('attachment')
+      end
     end
   end
 end

spec/requests/api/files_spec.rb

@@ -178,6 +178,14 @@ describe API::Files do
         expect(response).to have_gitlab_http_status(200)
       end
+      it 'forces attachment content disposition' do
+        url = route(file_path) + "/raw"
+
+        get api(url, current_user), params
+
+        expect(headers['Content-Disposition']).to match(/^attachment/)
+      end
+
       context 'when mandatory params are not given' do
         it_behaves_like '400 response' do
           let(:request) { get api(route("any%2Ffile"), current_user) }

spec/requests/api/repositories_spec.rb

@@ -168,6 +168,12 @@ describe API::Repositories do
         expect(response).to have_gitlab_http_status(200)
       end
+      it 'forces attachment content disposition' do
+        get api(route, current_user)
+
+        expect(headers['Content-Disposition']).to match(/^attachment/)
+      end
+
       context 'when sha does not exist' do
         it_behaves_like '404 response' do
           let(:request) { get api(route.sub(sample_blob.oid, '123456'), current_user) }

spec/requests/api/snippets_spec.rb

@@ -94,6 +94,12 @@ describe API::Snippets do
       expect(response.body).to eq(snippet.content)
     end
+    it 'forces attachment content disposition' do
+      get api("/snippets/#{snippet.id}/raw", user)
+
+      expect(headers['Content-Disposition']).to match(/^attachment/)
+    end
+
     it 'returns 404 for invalid snippet id' do
       get api("/snippets/1234/raw", user)