Check permissions on target space that is receiving ownership

- return 422 if the target space either doesn't exist or you don't have
write permissions for target space
- next step is to start actually transferring ownership or do request
body validation

Authored-by: Michael Oleske <moleske@pivotal.io>

app/controllers/v3/routes_controller.rb

@@ -171,10 +171,12 @@ def transfer_owner
     FeatureFlag.raise_unless_enabled!(:route_sharing)
     unauthorized! unless permission_queryer.can_manage_apps_in_active_space?(route.space.guid)
 
-    # target_space_guid = hashed_params['space']
-    # target_space = Space.where(guid: target_space_guid)
-    # check_spaces_exist_and_are_writeable!(route, [target_space_guid], [target_space])
-    # resource_not_found!(:space) unless target_space && permission_queryer.can_read_from_space?(target_space_guid, target_space.organization.guid)
+    target_space_guid = hashed_params['space']
+    target_space = Space.first(guid: target_space_guid)
+    if target_space.nil? || !can_write_space?(target_space)
+      unprocessable!("Unable to transfer owner of route #{route.uri} to space '#{target_space_guid}'. " \
+                     'Ensure the space exists and that you have access to it.')
+    end
     render status: :ok, json: { status: 'ok' }
   end
 

spec/request/routes_spec.rb

@@ -3155,13 +3155,12 @@
   end
 
   describe 'PATCH /v3/routes/:guid/transfer-owner' do
-    let(:domain) { VCAP::CloudController::PrivateDomain.make(owning_organization: space.organization) }
-    let(:route) { VCAP::CloudController::Route.make(space: space, domain: domain, host: '') }
-    let(:api_call) { lambda { |user_headers| patch "/v3/routes/#{route.guid}/transfer_owner", params.to_json, user_headers } }
-    let(:other_space) { VCAP::CloudController::Space.make(organization: org) }
-    let(:params) do
+    let(:route) { VCAP::CloudController::Route.make(space: space) }
+    let(:api_call) { lambda { |user_headers| patch "/v3/routes/#{route.guid}/transfer_owner", request_body.to_json, user_headers } }
+    let(:target_space) { VCAP::CloudController::Space.make(organization: org) }
+    let(:request_body) do
       {
-        space: other_space.guid.to_s
+        'space' => target_space.guid
       }
     end
     let(:space_dev_headers) do
@@ -3175,7 +3174,7 @@
 
     before do
       org.add_user(user)
-      other_space.add_developer(user)
+      target_space.add_developer(user)
     end
 
     context 'when the user logged in' do
@@ -3192,6 +3191,54 @@
       it_behaves_like 'permissions for single object endpoint', ALL_PERMISSIONS
     end
 
+    describe 'target space to transfer to' do
+      context 'does not exist' do
+        let(:target_space_guid) { 'fake-target' }
+        let(:request_body) do
+          {
+            'space' => target_space_guid
+          }
+        end
+
+        it 'responds with 422' do
+          api_call.call(space_dev_headers)
+
+          expect(last_response.status).to eq(422)
+          expect(parsed_response['errors']).to include(
+            include(
+              {
+                'detail' => "Unable to transfer owner of route #{route.uri} to space '#{target_space_guid}'. " \
+                            'Ensure the space exists and that you have access to it.',
+                'title' => 'CF-UnprocessableEntity'
+              })
+          )
+        end
+      end
+
+      context 'user does not have access to the target space' do
+        let(:no_access_target_space) { VCAP::CloudController::Space.make(organization: org) }
+        let(:request_body) do
+          {
+            'space' => no_access_target_space.guid
+          }
+        end
+
+        it 'responds with 422 and does not share the route' do
+          api_call.call(space_dev_headers)
+
+          expect(last_response.status).to eq(422)
+          expect(parsed_response['errors']).to include(
+            include(
+              {
+                'detail' => "Unable to transfer owner of route #{route.uri} to space '#{no_access_target_space.guid}'. "\
+                            'Ensure the space exists and that you have access to it.',
+                'title' => 'CF-UnprocessableEntity'
+              })
+          )
+        end
+      end
+    end
+
     describe 'when route_sharing flag is disabled' do
       before do
         feature_flag.enabled = false