Merge branch 'fix/private-references' into 'master'

Show referenced MRs & Issues only when the current viewer can access them

This addresses both issues identified in #6066.

## The private MR by user `remy2` with a note referencing to a public issue

![Screen_Shot_2016-01-12_at_16.45.02](/uploads/c245ec2c1fdea1f9ba05183c24e142d9/Screen_Shot_2016-01-12_at_16.45.02.png)

---

## The public issue viewed by user `remy` **who doesn't have access to `remy2/private-project`** before the fix

![Screen_Shot_2016-01-12_at_18.14.50](/uploads/8db5580e803f5bddd6cb935233c579a0/Screen_Shot_2016-01-12_at_18.14.50.png)

---

## The public issue viewed by user `remy` **who doesn't have access to `remy2/private-project`** with the fix

![Screen_Shot_2016-01-13_at_12.02.32](/uploads/cb199f7b78191fba486a11412412e307/Screen_Shot_2016-01-13_at_12.02.32.png)

---

## The public issue viewed by user `remy2` with the fix (no change)

![Screen_Shot_2016-01-13_at_11.54.06](/uploads/ddece590d69f597a95559beddcd36660/Screen_Shot_2016-01-13_at_11.54.06.png)


See merge request !2405

5 files changed, 181 insertions, 12 deletions

diff --git a/features/steps/project/issues/references.rb b/features/steps/project/issues/references.rb
new file mode 100644
index 00000000000..69e8b5cbde5
--- /dev/null
+++ b/features/steps/project/issues/references.rb
@@ -0,0 +1,7 @@
+class Spinach::Features::ProjectIssuesReferences < Spinach::FeatureSteps
+  include SharedAuthentication
+  include SharedIssuable
+  include SharedNote
+  include SharedProject
+  include SharedUser
+end
diff --git a/features/steps/project/merge_requests/references.rb b/features/steps/project/merge_requests/references.rb
new file mode 100644
index 00000000000..ab2ae6847a2
--- /dev/null
+++ b/features/steps/project/merge_requests/references.rb
@@ -0,0 +1,7 @@
+class Spinach::Features::ProjectMergeRequestsReferences < Spinach::FeatureSteps
+  include SharedAuthentication
+  include SharedIssuable
+  include SharedNote
+  include SharedProject
+  include SharedUser
+end
diff --git a/features/steps/shared/issuable.rb b/features/steps/shared/issuable.rb
index e6d1b8b8efc..4c5f7488efb 100644
--- a/features/steps/shared/issuable.rb
+++ b/features/steps/shared/issuable.rb
@@ -5,6 +5,99 @@ module SharedIssuable
     find(:css, '.issuable-edit').click
   end
 
+  step 'project "Community" has "Community issue" open issue' do
+    create_issuable_for_project(
+      project_name: 'Community',
+      title: 'Community issue'
+    )
+  end
+
+  step 'project "Community" has "Community fix" open merge request' do
+    create_issuable_for_project(
+      project_name: 'Community',
+      type: :merge_request,
+      title: 'Community fix'
+    )
+  end
+
+  step 'project "Enterprise" has "Enterprise issue" open issue' do
+    create_issuable_for_project(
+      project_name: 'Enterprise',
+      title: 'Enterprise issue'
+    )
+  end
+
+  step 'project "Enterprise" has "Enterprise fix" open merge request' do
+    create_issuable_for_project(
+      project_name: 'Enterprise',
+      type: :merge_request,
+      title: 'Enterprise fix'
+    )
+  end
+
+  step 'I leave a comment referencing issue "Community issue"' do
+    leave_reference_comment(
+      issuable: Issue.find_by(title: 'Community issue'),
+      from_project_name: 'Enterprise'
+    )
+  end
+
+  step 'I leave a comment referencing issue "Community fix"' do
+    leave_reference_comment(
+      issuable: MergeRequest.find_by(title: 'Community fix'),
+      from_project_name: 'Enterprise'
+    )
+  end
+
+  step 'I visit issue page "Enterprise issue"' do
+    issue = Issue.find_by(title: 'Enterprise issue')
+    visit namespace_project_issue_path(issue.project.namespace, issue.project, issue)
+  end
+
+  step 'I visit merge request page "Enterprise fix"' do
+    mr = MergeRequest.find_by(title: 'Enterprise fix')
+    visit namespace_project_merge_request_path(mr.target_project.namespace, mr.target_project, mr)
+  end
+
+  step 'I visit issue page "Community issue"' do
+    issue = Issue.find_by(title: 'Community issue')
+    visit namespace_project_issue_path(issue.project.namespace, issue.project, issue)
+  end
+
+  step 'I visit issue page "Community fix"' do
+    mr = MergeRequest.find_by(title: 'Community fix')
+    visit namespace_project_merge_request_path(mr.target_project.namespace, mr.target_project, mr)
+  end
+
+  step 'I should not see any related merge requests' do
+    page.within '.issue-details' do
+      expect(page).not_to have_content('.merge-requests')
+    end
+  end
+
+  step 'I should see the "Enterprise fix" related merge request' do
+    page.within '.merge-requests' do
+      expect(page).to have_content('1 Related Merge Request')
+      expect(page).to have_content('Enterprise fix')
+    end
+  end
+
+  step 'I should see a note linking to "Enterprise fix" merge request' do
+    visible_note(
+      issuable: MergeRequest.find_by(title: 'Enterprise fix'),
+      from_project_name: 'Community',
+      user_name: 'Mary Jane'
+    )
+  end
+
+  step 'I should see a note linking to "Enterprise issue" issue' do
+    visible_note(
+      issuable: Issue.find_by(title: 'Enterprise issue'),
+      from_project_name: 'Community',
+      user_name: 'Mary Jane'
+    )
+  end
+
   step 'I click link "Edit" for the merge request' do
     edit_issuable
   end
@@ -12,4 +105,45 @@ module SharedIssuable
   step 'I click link "Edit" for the issue' do
     edit_issuable
   end
+
+  def create_issuable_for_project(project_name:, title:, type: :issue)
+    project = Project.find_by(name: project_name)
+
+    attrs = {
+      title: title,
+      author: project.users.first,
+      description: '# Description header'
+    }
+
+    case type
+    when :issue
+      attrs.merge!(project: project)
+    when :merge_request
+      attrs.merge!(
+        source_project: project,
+        target_project: project,
+        source_branch: 'fix',
+        target_branch: 'master'
+      )
+    end
+
+    create(type, attrs)
+  end
+
+  def leave_reference_comment(issuable:, from_project_name:)
+    project = Project.find_by(name: from_project_name)
+
+    page.within('.js-main-target-form') do
+      fill_in 'note[note]', with: "##{issuable.to_reference(project)}"
+      click_button 'Add Comment'
+    end
+  end
+
+  def visible_note(issuable:, from_project_name:, user_name:)
+    project = Project.find_by(name: from_project_name)
+
+    expect(page).to have_content(user_name)
+    expect(page).to have_content("mentioned in #{issuable.class.to_s.titleize.downcase} #{issuable.to_reference(project)}")
+  end
+
 end
diff --git a/features/steps/shared/note.rb b/features/steps/shared/note.rb
index f6aabfefeff..444d6726f99 100644
--- a/features/steps/shared/note.rb
+++ b/features/steps/shared/note.rb
@@ -106,6 +106,10 @@ module SharedNote
     end
   end
 
+  step 'I should see no notes at all' do
+    expect(page).to_not have_css('.note')
+  end
+
   # Markdown
 
   step 'I leave a comment with a header containing "Comment with a header"' do
diff --git a/features/steps/shared/project.rb b/features/steps/shared/project.rb
index da643bf3ba9..d3501b5f5cb 100644
--- a/features/steps/shared/project.rb
+++ b/features/steps/shared/project.rb
@@ -161,24 +161,33 @@ module SharedProject
   end
 
   step '"John Doe" owns private project "Enterprise"' do
-    user = user_exists("John Doe", username: "john_doe")
-    project = Project.find_by(name: "Enterprise")
-    project ||= create(:empty_project, name: "Enterprise", namespace: user.namespace)
-    project.team << [user, :master]
+    user_owns_project(
+      user_name: 'John Doe',
+      project_name: 'Enterprise'
+    )
+  end
+
+  step '"Mary Jane" owns private project "Enterprise"' do
+    user_owns_project(
+      user_name: 'Mary Jane',
+      project_name: 'Enterprise'
+    )
   end
 
   step '"John Doe" owns internal project "Internal"' do
-    user = user_exists("John Doe", username: "john_doe")
-    project = Project.find_by(name: "Internal")
-    project ||= create :empty_project, :internal, name: 'Internal', namespace: user.namespace
-    project.team << [user, :master]
+    user_owns_project(
+      user_name: 'John Doe',
+      project_name: 'Internal',
+      visibility: :internal
+    )
   end
 
   step '"John Doe" owns public project "Community"' do
-    user = user_exists("John Doe", username: "john_doe")
-    project = Project.find_by(name: "Community")
-    project ||= create :empty_project, :public, name: 'Community', namespace: user.namespace
-    project.team << [user, :master]
+    user_owns_project(
+      user_name: 'John Doe',
+      project_name: 'Community',
+      visibility: :public
+    )
   end
 
   step 'public empty project "Empty Public Project"' do
@@ -213,4 +222,12 @@ module SharedProject
       expect(page).to have_content("skipped")
     end
   end
+
+  def user_owns_project(user_name:, project_name:, visibility: :private)
+    user = user_exists(user_name, username: user_name.gsub(/\s/, '').underscore)
+    project = Project.find_by(name: project_name)
+    project ||= create(:empty_project, visibility, name: project_name, namespace: user.namespace)
+    project.team << [user, :master]
+  end
+
 end