Add latest changes from gitlab-org/gitlab@13-4-stable-ee

3 files changed, 180 insertions, 0 deletions

diff --git a/app/services/issuable_links/create_service.rb b/app/services/issuable_links/create_service.rb
new file mode 100644
index 00000000000..f148c503dcf
--- /dev/null
+++ b/app/services/issuable_links/create_service.rb
@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+module IssuableLinks
+  class CreateService < BaseService
+    include IncidentManagement::UsageData
+
+    attr_reader :issuable, :current_user, :params
+
+    def initialize(issuable, user, params)
+      @issuable, @current_user, @params = issuable, user, params.dup
+    end
+
+    def execute
+      # If ALL referenced issues are already assigned to the given epic it renders a conflict status,
+      # otherwise create issue links for the issues which
+      # are still not assigned and return success message.
+      if render_conflict_error?
+        return error(issuables_assigned_message, 409)
+      end
+
+      if render_not_found_error?
+        return error(issuables_not_found_message, 404)
+      end
+
+      @errors = []
+      create_links
+
+      if @errors.present?
+        return error(@errors.join('. '), 422)
+      end
+
+      track_event
+
+      success
+    end
+
+    private
+
+    def render_conflict_error?
+      referenced_issuables.present? && (referenced_issuables - previous_related_issuables).empty?
+    end
+
+    def render_not_found_error?
+      linkable_issuables(referenced_issuables).empty?
+    end
+
+    def create_links
+      objects = linkable_issuables(referenced_issuables)
+      link_issuables(objects)
+    end
+
+    def link_issuables(target_issuables)
+      target_issuables.each do |referenced_object|
+        link = relate_issuables(referenced_object)
+
+        unless link.valid?
+          @errors << _("%{ref} cannot be added: %{error}") % {
+            ref: referenced_object.to_reference,
+            error: link.errors.messages.values.flatten.to_sentence
+          }
+        end
+      end
+    end
+
+    def referenced_issuables
+      @referenced_issuables ||= begin
+        target_issuable = params[:target_issuable]
+
+        if params[:issuable_references].present?
+          extract_references
+        elsif target_issuable
+          [target_issuable]
+        else
+          []
+        end
+      end
+    end
+
+    def extract_references
+      issuable_references = params[:issuable_references]
+      text = issuable_references.join(' ')
+
+      extractor = Gitlab::ReferenceExtractor.new(issuable.project, current_user)
+      extractor.analyze(text, extractor_context)
+
+      references(extractor)
+    end
+
+    def references(extractor)
+      extractor.issues
+    end
+
+    def extractor_context
+      {}
+    end
+
+    def linkable_issuables(objects)
+      raise NotImplementedError
+    end
+
+    def previous_related_issuables
+      raise NotImplementedError
+    end
+
+    def relate_issuables(referenced_object)
+      raise NotImplementedError
+    end
+
+    def issuables_assigned_message
+      'Issue(s) already assigned'
+    end
+
+    def issuables_not_found_message
+      'No Issue found for given params'
+    end
+  end
+end
+
+IssuableLinks::CreateService.prepend_if_ee('EE::IssuableLinks::CreateService')
diff --git a/app/services/issuable_links/destroy_service.rb b/app/services/issuable_links/destroy_service.rb
new file mode 100644
index 00000000000..57e1314e0da
--- /dev/null
+++ b/app/services/issuable_links/destroy_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module IssuableLinks
+  class DestroyService < BaseService
+    include IncidentManagement::UsageData
+
+    attr_reader :link, :current_user
+
+    def initialize(link, user)
+      @link = link
+      @current_user = user
+    end
+
+    def execute
+      return error(not_found_message, 404) unless permission_to_remove_relation?
+
+      remove_relation
+      create_notes
+      track_event
+
+      success(message: 'Relation was removed')
+    end
+
+    private
+
+    def remove_relation
+      link.destroy!
+    end
+
+    def not_found_message
+      'No Issue Link found'
+    end
+  end
+end
diff --git a/app/services/issuable_links/list_service.rb b/app/services/issuable_links/list_service.rb
new file mode 100644
index 00000000000..10a2da7eb03
--- /dev/null
+++ b/app/services/issuable_links/list_service.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module IssuableLinks
+  class ListService
+    include Gitlab::Routing
+
+    attr_reader :issuable, :current_user
+
+    def initialize(issuable, user)
+      @issuable, @current_user = issuable, user
+    end
+
+    def execute
+      serializer.new(current_user: current_user, issuable: issuable).represent(child_issuables)
+    end
+
+    private
+
+    def serializer
+      raise NotImplementedError
+    end
+
+    def preload_for_collection
+      [{ project: :namespace }, :assignees]
+    end
+  end
+end