Share collaboration check between view and presenter

app/controllers/concerns/checks_collaboration.rb

+module ChecksCollaboration
+  def can_collaborate_with_project?(project, ref: nil)
+    return true if can?(current_user, :push_code, project)
+
+    can_create_merge_request =
+      can?(current_user, :create_merge_request_in, project) &&
+      current_user.already_forked?(project)
+
+    can_create_merge_request ||
+      user_access(project).can_push_to_branch?(ref)
+  end
+
+  # rubocop:disable Gitlab/ModuleWithInstanceVariables
+  # enabling this so we can easily cache the user access value as it might be
+  # used across multiple calls in the view
+  def user_access(project)
+    @user_access ||= {}
+    @user_access[project] ||= Gitlab::UserAccess.new(current_user, project: project)
+  end
+  # rubocop:enable Gitlab/ModuleWithInstanceVariables
+end

app/controllers/projects/application_controller.rb

 class Projects::ApplicationController < ApplicationController
   include RoutableActions
+  include ChecksCollaboration
   skip_before_action :authenticate_user!
   before_action :project
@@ -31,18 +32,6 @@ class Projects::ApplicationController < ApplicationController
     @repository ||= project.repository
   end
-  def can_collaborate_with_project?(project = nil, ref: nil)
-    project ||= @project
-
-    can_create_merge_request =
-      can?(current_user, :create_merge_request_in, project) &&
-      current_user.already_forked?(project)
-
-    can?(current_user, :push_code, project) ||
-      can_create_merge_request ||
-      user_access(project).can_push_to_branch?(ref)
-  end
-
   def authorize_action!(action)
     unless can?(current_user, action, project)
       return access_denied!
@@ -95,9 +84,4 @@ class Projects::ApplicationController < ApplicationController
   def check_issues_available!
     return render_404 unless @project.feature_available?(:issues, current_user)
   end
-
-  def user_access(project)
-    @user_access ||= {}
-    @user_access[project] ||= Gitlab::UserAccess.new(current_user, project: project)
-  end
 end

app/helpers/commits_helper.rb

@@ -163,7 +163,7 @@ module CommitsHelper
     tooltip = "#{action.capitalize} this #{commit.change_type_title(current_user)} in a new merge request" if has_tooltip
     btn_class = "btn btn-#{btn_class}" unless btn_class.nil?
-    if can_collaborate_with_project?
+    if can_collaborate_with_project?(@project)
       link_to action.capitalize, "#modal-#{action}-commit", 'data-toggle' => 'modal', 'data-container' => 'body', title: (tooltip if has_tooltip), class: "#{btn_class} #{'has-tooltip' if has_tooltip}"
     elsif can?(current_user, :fork_project, @project)
       continue_params = {

app/presenters/merge_request_presenter.rb

@@ -3,6 +3,7 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
   include GitlabRoutingHelper
   include MarkupHelper
   include TreeHelper
+  include ChecksCollaboration
   include Gitlab::Utils::StrongMemoize
   presents :merge_request
@@ -152,11 +153,11 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
   end
   def can_revert_on_current_merge_request?
-    user_can_collaborate_with_project? && cached_can_be_reverted?
+    can_collaborate_with_project?(project) && cached_can_be_reverted?
   end
   def can_cherry_pick_on_current_merge_request?
-    user_can_collaborate_with_project? && can_be_cherry_picked?
+    can_collaborate_with_project?(project) && can_be_cherry_picked?
   end
   def can_push_to_source_branch?
@@ -195,16 +196,6 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
     end.sort.to_sentence
   end
-  def user_can_collaborate_with_project?
-    can_create_merge_request =
-      can?(current_user, :create_merge_request_in, project) &&
-      current_user.already_forked?(project)
-
-    can?(current_user, :push_code, project) ||
-      can_create_merge_request ||
-      can_push_to_source_branch?
-  end
-
   def user_can_fork_project?
     can?(current_user, :fork_project, project)
   end

app/views/projects/commit/_commit_box.html.haml

@@ -35,7 +35,7 @@
         - unless @commit.has_been_reverted?(current_user)
           %li.clearfix
             = revert_commit_link(@commit, project_commit_path(@project, @commit.id), has_tooltip: false)
-        - if can_collaborate_with_project?
+        - if can_collaborate_with_project?(@project)
           %li.clearfix
             = cherry_pick_commit_link(@commit, project_commit_path(@project, @commit.id), has_tooltip: false)
         - if can?(current_user, :push_code, @project)

app/views/projects/commit/show.html.haml

@@ -17,6 +17,6 @@
   .limited-width-notes
     = render "shared/notes/notes_with_form", :autocomplete => true
-    - if can_collaborate_with_project?
+    - if can_collaborate_with_project?(@project)
       - %w(revert cherry-pick).each do |type|
         = render "projects/commit/change", type: type, commit: @commit, title: @commit.title

spec/controllers/concerns/checks_collaboration_spec.rb

+require 'spec_helper'
+
+describe ChecksCollaboration do
+  include ProjectForksHelper
+
+  let(:helper) do
+    fake_class = Class.new(ApplicationController) do
+      include ChecksCollaboration
+    end
+
+    fake_class.new
+  end
+
+  describe '#can_collaborate_with_project?' do
+    let(:user) { create(:user) }
+    let(:project) { create(:project, :public) }
+
+    before do
+      allow(helper).to receive(:current_user).and_return(user)
+      allow(helper).to receive(:can?) do |user, ability, subject|
+        Ability.allowed?(user, ability, subject)
+      end
+    end
+
+    it 'is true if the user can push to the project'  do
+      project.add_developer(user)
+
+      expect(helper.can_collaborate_with_project?(project)).to be_truthy
+    end
+
+    it 'is true when the user can push to a branch of the project' do
+      fake_access = double('Gitlab::UserAccess')
+      expect(fake_access).to receive(:can_push_to_branch?).with('a-branch').and_return(true)
+      expect(Gitlab::UserAccess).to receive(:new).with(user, project: project).and_return(fake_access)
+
+      expect(helper.can_collaborate_with_project?(project, ref: 'a-branch')).to be_truthy
+    end
+
+    context 'when the user has forked the project' do
+      before do
+        fork_project(project, user, namespace: user.namespace)
+      end
+
+      it 'is true' do
+        expect(helper.can_collaborate_with_project?(project)).to be_truthy
+      end
+
+      it 'is false when the project is archived' do
+        project.archived = true
+
+        expect(helper.can_collaborate_with_project?(project)).to be_falsy
+      end
+    end
+  end
+end

spec/views/projects/tree/show.html.haml_spec.rb

@@ -12,6 +12,7 @@ describe 'projects/tree/show' do
     assign(:lfs_blob_ids, [])
     allow(view).to receive(:can?).and_return(true)
+    allow(view).to receive(:can_contribute_to_project?).and_return(true)
     allow(view).to receive(:can_collaborate_with_project?).and_return(true)
     allow(view).to receive_message_chain('user_access.can_push_to_branch?').and_return(true)
     allow(view).to receive(:current_application_settings).and_return(Gitlab::CurrentSettings.current_application_settings)