prevent sprint sharing on contract level

modules/backlogs/app/contracts/projects/backlog_settings_contract.rb

@@ -36,6 +36,7 @@ module Projects
     validate :validate_global_sprint_sharer_uniqueness
     validates :sprint_sharing, presence: true
     validates :sprint_sharing, inclusion: { in: Project::SPRINT_SHARING_MODES }, allow_blank: true
+    validate :validate_sprint_sharing_in_ee_token
 
     def validate_model? = false
 
@@ -59,5 +60,19 @@ module Projects
         end
       end
     end
+
+    def validate_sprint_sharing_in_ee_token
+      if !model.not_sharing_sprints? &&
+         !EnterpriseToken.allows_to?(:sprint_sharing) &&
+         sprint_sharing_changed?
+        errors.add :sprint_sharing,
+                   :enterprise_plan_required,
+                   plan_name: I18n.t("ee.upsell.plan_name", plan: OpenProject::Token.lowest_plan_for(:sprint_sharing))
+      end
+    end
+
+    def sprint_sharing_changed?
+      model.settings_change&.any? { it.key?("sprint_sharing") }
+    end
   end
 end

modules/backlogs/spec/contracts/projects/backlog_settings_contract_spec.rb

@@ -3,11 +3,11 @@
 require "spec_helper"
 require "contracts/shared/model_contract_shared_context"
 
-RSpec.describe Projects::BacklogSettingsContract, type: :model do
+RSpec.describe Projects::BacklogSettingsContract, type: :model, with_ee: %i[sprint_sharing] do
   include_context "ModelContract shared context"
 
   let(:current_user) { build_stubbed(:user) }
-  let(:project) { create(:project) }
+  let(:project) { build_stubbed(:project) }
   let(:permissions) { %i(share_sprint) }
 
   subject(:contract) { described_class.new(project, current_user) }
@@ -35,7 +35,7 @@ RSpec.describe Projects::BacklogSettingsContract, type: :model do
 
     # This spec of explicitly setting sprint_sharing to empty is required because the
     # simple presence validation spec is not sufficient to catch certain corner cases.
-    # For example, when the sprint_sharing getter is overriden to provide a default value,
+    # For example, when the sprint_sharing getter is overridden to provide a default value,
     # and the user submits an empty value, the contract should be invalid.
     context "when sprint_sharing is empty" do
       before { project.sprint_sharing = "" }
@@ -57,6 +57,62 @@ RSpec.describe Projects::BacklogSettingsContract, type: :model do
       end
     end
 
+    context "when the `sprint_sharing` is not part of the current EE token", with_ee: [] do
+      context "when sprint sharing is set to 'no_sharing'" do
+        before { project.sprint_sharing = Project::NO_SHARING }
+
+        it_behaves_like "contract is valid"
+      end
+
+      context "when sprint sharing is set to 'share_all_projects'" do
+        before { project.sprint_sharing = Project::SHARE_ALL_PROJECTS }
+
+        it_behaves_like "contract is invalid",
+                        sprint_sharing: { error: :enterprise_plan_required, plan_name: "corporate enterprise plan" }
+      end
+
+      context "when sprint sharing is set to 'share_subprojects'" do
+        before { project.sprint_sharing = Project::SHARE_SUBPROJECTS }
+
+        it_behaves_like "contract is invalid",
+                        sprint_sharing: { error: :enterprise_plan_required, plan_name: "corporate enterprise plan" }
+      end
+
+      context "when sprint sharing is set to 'receive_shared'" do
+        before { project.sprint_sharing = Project::RECEIVE_SHARED }
+
+        it_behaves_like "contract is invalid",
+                        sprint_sharing: { error: :enterprise_plan_required, plan_name: "corporate enterprise plan" }
+      end
+
+      context "when sprint sharing remains on 'share_all_projects'" do
+        before do
+          project.sprint_sharing = Project::SHARE_ALL_PROJECTS
+          project.clear_changes_information
+        end
+
+        it_behaves_like "contract is valid"
+      end
+
+      context "when sprint sharing remains on 'share_subprojects'" do
+        before do
+          project.sprint_sharing = Project::SHARE_SUBPROJECTS
+          project.clear_changes_information
+        end
+
+        it_behaves_like "contract is valid"
+      end
+
+      context "when sprint sharing remains on 'receive_shared'" do
+        before do
+          project.sprint_sharing = Project::RECEIVE_SHARED
+          project.clear_changes_information
+        end
+
+        it_behaves_like "contract is valid"
+      end
+    end
+
     describe "#validate_global_sprint_sharer_uniqueness" do
       before do
         project.sprint_sharing = "share_all_projects"

spec/contracts/shared/model_contract_shared_context.rb

@@ -48,7 +48,11 @@ RSpec.shared_context "ModelContract shared context" do # rubocop:disable RSpec/C
         [error_symbols]
       end
     end
-    contract_errors = errors.keys.index_with { |key| contract.errors.symbols_for(key) }
+
+    contract_errors = errors.keys.index_with do |key|
+      errors[key].is_a?(Hash) ? contract.errors.details[key] : contract.errors.symbols_for(key)
+    end
+
     expect(contract_errors).to match(expected_errors)
     if RSpec.current_example.metadata[:check_errors_i18n]
       # ensure no I18n::MissingTranslationData is raised because of missing attributes and/or errors translations