Port `read_cross_project` ability from EE

10 files changed, 412 insertions, 6 deletions

diff --git a/spec/lib/banzai/commit_renderer_spec.rb b/spec/lib/banzai/commit_renderer_spec.rb
index 84adaebdcbe..e7ebb2a332f 100644
--- a/spec/lib/banzai/commit_renderer_spec.rb
+++ b/spec/lib/banzai/commit_renderer_spec.rb
@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Banzai::CommitRenderer do
   describe '.render' do
     it 'renders a commit description and title' do
-      user = double(:user)
+      user = build(:user)
       project = create(:project, :repository)
 
       expect(Banzai::ObjectRenderer).to receive(:new).with(project, user).and_call_original
diff --git a/spec/lib/banzai/filter/cross_project_issuable_information_filter_spec.rb b/spec/lib/banzai/filter/cross_project_issuable_information_filter_spec.rb
new file mode 100644
index 00000000000..92b8c526e88
--- /dev/null
+++ b/spec/lib/banzai/filter/cross_project_issuable_information_filter_spec.rb
@@ -0,0 +1,50 @@
+require 'spec_helper'
+
+describe Banzai::Filter::CrossProjectIssuableInformationFilter do
+  include ActionView::Helpers::UrlHelper
+  include FilterSpecHelper
+
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public) }
+  let(:context) { { project: project, current_user: user } }
+  let(:other_project) { create(:project, :public) }
+
+  def create_link(issuable)
+    type = issuable.class.name.underscore.downcase
+    link_to(issuable.to_reference, '',
+            class: 'gfm has-tooltip',
+            title: issuable.title,
+            data: {
+              reference_type: type,
+              "#{type}": issuable.id
+            })
+  end
+
+  context 'when the user cannot read cross project' do
+    before do
+      allow(Ability).to receive(:allowed?) { false }
+    end
+
+    it 'skips links to issues within the same project' do
+      issue = create(:issue, project: project)
+      link = create_link(issue)
+      doc = filter(link, context)
+
+      result = doc.css('a').last
+
+      expect(result['class']).to include('has-tooltip')
+      expect(result['title']).to eq(issue.title)
+    end
+
+    it 'removes info from a cross project reference' do
+      issue = create(:issue, project: other_project)
+      link = create_link(issue)
+      doc = filter(link, context)
+
+      result = doc.css('a').last
+
+      expect(result['class']).not_to include('has-tooltip')
+      expect(result['title']).to be_empty
+    end
+  end
+end
diff --git a/spec/lib/banzai/filter/issuable_state_filter_spec.rb b/spec/lib/banzai/filter/issuable_state_filter_spec.rb
index cacb33d3372..17347768a49 100644
--- a/spec/lib/banzai/filter/issuable_state_filter_spec.rb
+++ b/spec/lib/banzai/filter/issuable_state_filter_spec.rb
@@ -77,6 +77,14 @@ describe Banzai::Filter::IssuableStateFilter do
     expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)} (closed)")
   end
 
+  it 'skips cross project references if the user cannot read cross project' do
+    expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+    link = create_link(closed_issue.to_reference(other_project), issue: closed_issue.id, reference_type: 'issue')
+    doc = filter(link, context.merge(project: other_project))
+
+    expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)}")
+  end
+
   it 'does not append state when filter is not enabled' do
     link = create_link('text', issue: closed_issue.id, reference_type: 'issue')
     context = { current_user: user }
diff --git a/spec/lib/banzai/redactor_spec.rb b/spec/lib/banzai/redactor_spec.rb
index 2424c3fdc66..893a10d1b90 100644
--- a/spec/lib/banzai/redactor_spec.rb
+++ b/spec/lib/banzai/redactor_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Banzai::Redactor do
-  let(:user) { build(:user) }
+  let(:user) { create(:user) }
   let(:project) { build(:project) }
   let(:redactor) { described_class.new(project, user) }
 
diff --git a/spec/lib/banzai/reference_parser/issue_parser_spec.rb b/spec/lib/banzai/reference_parser/issue_parser_spec.rb
index 4cef3bdb24b..0a63567ee40 100644
--- a/spec/lib/banzai/reference_parser/issue_parser_spec.rb
+++ b/spec/lib/banzai/reference_parser/issue_parser_spec.rb
@@ -19,19 +19,58 @@ describe Banzai::ReferenceParser::IssueParser do
 
       it 'returns the nodes when the user can read the issue' do
         expect(Ability).to receive(:issues_readable_by_user)
-          .with([issue], user)
-          .and_return([issue])
+                             .with([issue], user)
+                             .and_return([issue])
 
         expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
       end
 
       it 'returns an empty Array when the user can not read the issue' do
         expect(Ability).to receive(:issues_readable_by_user)
-          .with([issue], user)
-          .and_return([])
+                             .with([issue], user)
+                             .and_return([])
 
         expect(subject.nodes_visible_to_user(user, [link])).to eq([])
       end
+
+      context 'when the user cannot read cross project' do
+        let(:issue) { create(:issue) }
+
+        before do
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project, :global) { false }
+        end
+
+        it 'returns the nodes when the user can read the issue' do
+          expect(Ability).to receive(:allowed?)
+                               .with(user, :read_issue_iid, issue)
+                               .and_return(true)
+
+          expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
+        end
+
+        it 'returns an empty Array when the user can not read the issue' do
+          expect(Ability).to receive(:allowed?)
+                               .with(user, :read_issue_iid, issue)
+                               .and_return(false)
+
+          expect(subject.nodes_visible_to_user(user, [link])).to eq([])
+        end
+
+        context 'when the issue is not cross project' do
+          let(:issue) { create(:issue, project: project) }
+
+          it 'does not check `can_read_reference` if the issue is not cross project' do
+            expect(Ability).to receive(:issues_readable_by_user)
+                                 .with([issue], user)
+                                 .and_return([])
+
+            expect(subject).not_to receive(:can_read_reference?).with(user, issue)
+
+            expect(subject.nodes_visible_to_user(user, [link])).to eq([])
+          end
+        end
+      end
     end
 
     context 'when the link does not have a data-issue attribute' do
diff --git a/spec/lib/gitlab/contributions_calendar_spec.rb b/spec/lib/gitlab/contributions_calendar_spec.rb
index f1655854486..49a179ba875 100644
--- a/spec/lib/gitlab/contributions_calendar_spec.rb
+++ b/spec/lib/gitlab/contributions_calendar_spec.rb
@@ -118,6 +118,19 @@ describe Gitlab::ContributionsCalendar do
       expect(calendar.events_by_date(today)).to contain_exactly(e1)
       expect(calendar(contributor).events_by_date(today)).to contain_exactly(e1, e2, e3)
     end
+
+    context 'when the user cannot read read cross project' do
+      before do
+        allow(Ability).to receive(:allowed?).and_call_original
+        expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+      end
+
+      it 'does not return any events' do
+        create_event(public_project, today)
+
+        expect(calendar(user).events_by_date(today)).to be_empty
+      end
+    end
   end
 
   describe '#starting_year' do
diff --git a/spec/lib/gitlab/cross_project_access/check_collection_spec.rb b/spec/lib/gitlab/cross_project_access/check_collection_spec.rb
new file mode 100644
index 00000000000..a9e7575240e
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/check_collection_spec.rb
@@ -0,0 +1,55 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::CheckCollection do
+  subject(:collection) { described_class.new }
+
+  describe '#add_collection' do
+    it 'merges the checks of 2 collections' do
+      initial_check = double('check')
+      collection.add_check(initial_check)
+
+      other_collection = described_class.new
+      other_check = double('other_check')
+      other_collection.add_check(other_check)
+
+      shared_check = double('shared check')
+      other_collection.add_check(shared_check)
+      collection.add_check(shared_check)
+
+      collection.add_collection(other_collection)
+
+      expect(collection.checks).to contain_exactly(initial_check, shared_check, other_check)
+    end
+  end
+
+  describe '#should_run?' do
+    def fake_check(run, skip)
+      check = double("Check: run=#{run} - skip={skip}")
+      allow(check).to receive(:should_run?).and_return(run)
+      allow(check).to receive(:should_skip?).and_return(skip)
+      allow(check).to receive(:skip).and_return(skip)
+
+      check
+    end
+
+    it 'returns true if one of the check says it should run' do
+      check = fake_check(true, false)
+      other_check = fake_check(false, false)
+
+      collection.add_check(check)
+      collection.add_check(other_check)
+
+      expect(collection.should_run?(double)).to be_truthy
+    end
+
+    it 'returns false if one of the check says it should be skipped' do
+      check = fake_check(true, false)
+      other_check = fake_check(false, true)
+
+      collection.add_check(check)
+      collection.add_check(other_check)
+
+      expect(collection.should_run?(double)).to be_falsey
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access/check_info_spec.rb b/spec/lib/gitlab/cross_project_access/check_info_spec.rb
new file mode 100644
index 00000000000..bc9dbf2bece
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/check_info_spec.rb
@@ -0,0 +1,111 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::CheckInfo do
+  let(:dummy_controller) { double }
+
+  before do
+    allow(dummy_controller).to receive(:action_name).and_return('index')
+  end
+
+  describe '#should_run?' do
+    it 'runs when an action is defined' do
+      info = described_class.new({ index: true }, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'runs when the action is missing' do
+      info = described_class.new({}, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not run when the action is excluded' do
+      info = described_class.new({ index: false }, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'runs when the `if` conditional is true' do
+      info = described_class.new({}, -> { true }, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not run when the if condition is false' do
+      info = described_class.new({}, -> { false }, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not run when the `unless` check is true' do
+      info = described_class.new({}, nil, -> { true }, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'runs when the `unless` check is false' do
+      info = described_class.new({}, nil, -> { false }, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'returns the the oposite of #should_skip? when the check is a skip' do
+      info = described_class.new({}, nil, nil, true)
+
+      expect(info).to receive(:should_skip?).with(dummy_controller).and_return(false)
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+  end
+
+  describe '#should_skip?' do
+    it 'skips when an action is defined' do
+      info = described_class.new({ index: true }, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not skip when the action is not defined' do
+      info = described_class.new({}, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not skip when the action is excluded' do
+      info = described_class.new({ index: false }, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'skips when the `if` conditional is true' do
+      info = described_class.new({ index: true }, -> { true }, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not skip the `if` conditional is false' do
+      info = described_class.new({ index: true }, -> { false }, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not skip when the `unless` check is true' do
+      info = described_class.new({ index: true }, nil, -> { true }, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'skips when `unless` check is false' do
+      info = described_class.new({ index: true }, nil, -> { false }, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'returns the the oposite of #should_run? when the check is not a skip' do
+      info = described_class.new({}, nil, nil, false)
+
+      expect(info).to receive(:should_run?).with(dummy_controller).and_return(false)
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access/class_methods_spec.rb b/spec/lib/gitlab/cross_project_access/class_methods_spec.rb
new file mode 100644
index 00000000000..5349685e633
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/class_methods_spec.rb
@@ -0,0 +1,46 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::ClassMethods do
+  let(:dummy_class) do
+    Class.new do
+      extend Gitlab::CrossProjectAccess::ClassMethods
+    end
+  end
+  let(:dummy_proc) { lambda { false } }
+
+  describe '#requires_cross_project_access' do
+    it 'creates a correct check when a hash is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: false },
+                                     positive_condition: dummy_proc,
+                                     negative_condition: dummy_proc)
+
+      dummy_class.requires_cross_project_access(
+        hello: true, world: false, if: dummy_proc, unless: dummy_proc
+      )
+    end
+
+    it 'creates a correct check when an array is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: true },
+                                     positive_condition: nil,
+                                     negative_condition: nil)
+
+      dummy_class.requires_cross_project_access(:hello, :world)
+    end
+
+    it 'creates a correct check when an array and a hash is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: true },
+                                     positive_condition: dummy_proc,
+                                     negative_condition: dummy_proc)
+
+      dummy_class.requires_cross_project_access(
+        :hello, :world, if: dummy_proc, unless: dummy_proc
+      )
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access_spec.rb b/spec/lib/gitlab/cross_project_access_spec.rb
new file mode 100644
index 00000000000..614b0473c7e
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access_spec.rb
@@ -0,0 +1,84 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess do
+  let(:super_class) { Class.new }
+  let(:descendant_class) { Class.new(super_class) }
+  let(:current_instance) { described_class.new }
+
+  before do
+    allow(described_class).to receive(:instance).and_return(current_instance)
+  end
+
+  describe '#add_check' do
+    it 'keeps track of the properties to check' do
+      expect do
+        described_class.add_check(super_class,
+                                  actions: { index: true },
+                                  positive_condition: -> { true },
+                                  negative_condition: -> { false })
+      end.to change { described_class.checks.size }.by(1)
+    end
+
+    it 'builds the check correctly' do
+      check_collection = described_class.add_check(super_class,
+                                                   actions: { index: true },
+                                                   positive_condition: -> { 'positive' },
+                                                   negative_condition: -> { 'negative' })
+
+      check = check_collection.checks.first
+
+      expect(check.actions).to eq(index: true)
+      expect(check.positive_condition.call).to eq('positive')
+      expect(check.negative_condition.call).to eq('negative')
+    end
+
+    it 'merges the checks of a parent class into existing checks of a subclass' do
+      subclass_collection = described_class.add_check(descendant_class)
+
+      expect(subclass_collection).to receive(:add_collection).and_call_original
+
+      described_class.add_check(super_class)
+    end
+
+    it 'merges the existing checks of a superclass into the checks of a subclass' do
+      super_collection = described_class.add_check(super_class)
+      descendant_collection = described_class.add_check(descendant_class)
+
+      expect(descendant_collection.checks).to include(*super_collection.checks)
+    end
+  end
+
+  describe '#find_check' do
+    it 'returns a check when it was defined for a superclass' do
+      expected_check = described_class.add_check(super_class,
+                                                 actions: { index: true },
+                                                 positive_condition: -> { 'positive' },
+                                                 negative_condition: -> { 'negative' })
+
+      expect(described_class.find_check(descendant_class.new))
+        .to eq(expected_check)
+    end
+
+    it 'caches the result for a subclass' do
+      described_class.add_check(super_class,
+                                actions: { index: true },
+                                positive_condition: -> { 'positive' },
+                                negative_condition: -> { 'negative' })
+
+      expect(described_class.instance).to receive(:closest_parent).once.and_call_original
+
+      2.times { described_class.find_check(descendant_class.new) }
+    end
+
+    it 'returns the checks for the closest class if there are more checks available' do
+      described_class.add_check(super_class,
+                                actions: { index: true })
+      expected_check = described_class.add_check(descendant_class,
+                                                 actions: { index: true, show: false })
+
+      check = described_class.find_check(descendant_class.new)
+
+      expect(check).to eq(expected_check)
+    end
+  end
+end