Map jira issue assignee and author

- map them to correct fields instead of description

changelogs/unreleased/jira-user-importer.yml

+---
+title: Map Jira issue assignee and author
+merge_request: 30498
+author:
+type: added

lib/gitlab/jira_import/issue_serializer.rb

@@ -21,7 +21,8 @@ module Gitlab
           state_id: map_status(jira_issue.status.statusCategory),
           updated_at: jira_issue.updated,
           created_at: jira_issue.created,
-          author_id: project.creator_id, # TODO: map actual author: https://gitlab.com/gitlab-org/gitlab/-/issues/210580
+          author_id: reporter,
+          assignee_ids: assignees,
           label_ids: label_ids
         }
       end
@@ -34,8 +35,6 @@ module Gitlab
 
       def description
         body = []
-        body << formatter.author_line(jira_issue.reporter.displayName)
-        body << formatter.assignee_line(jira_issue.assignee.displayName) if jira_issue.assignee
         body << jira_issue.description
         body << MetadataCollector.new(jira_issue).execute
 
@@ -51,6 +50,38 @@ module Gitlab
         end
       end
 
+      def map_user_id(email)
+        return unless email
+
+        # We also include emails that are not yet confirmed
+        users = User.by_any_email(email).to_a
+
+        # this event should never happen but we should log it in case we have invalid data
+        log_user_mapping_message('Multiple users found for an email address', email) if users.count > 1
+
+        user = users.first
+
+        unless project.project_member(user)
+          log_user_mapping_message('Jira user not found', email)
+
+          return
+        end
+
+        user.id
+      end
+
+      def reporter
+        map_user_id(jira_issue&.reporter&.emailAddress) || project.creator_id
+      end
+
+      def assignees
+        found_user_id = map_user_id(jira_issue&.assignee&.emailAddress)
+
+        return unless found_user_id
+
+        [found_user_id]
+      end
+
       # We already create labels in Gitlab::JiraImport::LabelsImporter stage but
       # there is a possibility it may fail or
       # new labels were created on the Jira in the meantime
@@ -59,6 +90,19 @@ module Gitlab
 
         Gitlab::JiraImport::HandleLabelsService.new(project, jira_issue.fields['labels']).execute
       end
+
+      def logger
+        @logger ||= Gitlab::Import::Logger.build
+      end
+
+      def log_user_mapping_message(message, email)
+        logger.info(
+          project_id: project.id,
+          project_path: project.full_path,
+          user_email: email,
+          message: message
+        )
+      end
     end
   end
 end

spec/lib/gitlab/jira_import/issue_serializer_spec.rb

@@ -16,7 +16,8 @@ describe Gitlab::JiraImport::IssueSerializer do
     let(:description) { 'basic description' }
     let(:created_at) { '2020-01-01 20:00:00' }
     let(:updated_at) { '2020-01-10 20:00:00' }
-    let(:assignee) { double(displayName: 'Solver') }
+    let(:assignee) { double(displayName: 'Solver', emailAddress: 'assignee@example.com') }
+    let(:reporter) { double(displayName: 'Reporter', emailAddress: 'reporter@example.com') }
     let(:jira_status) { 'new' }
 
     let(:parent_field) do
@@ -42,7 +43,7 @@ describe Gitlab::JiraImport::IssueSerializer do
         created: created_at,
         updated: updated_at,
         assignee: assignee,
-        reporter: double(displayName: 'Reporter'),
+        reporter: reporter,
         status: double(statusCategory: { 'key' => jira_status }),
         fields: fields
       )
@@ -54,10 +55,6 @@ describe Gitlab::JiraImport::IssueSerializer do
 
     let(:expected_description) do
       <<~MD
-        *Created by: Reporter*
-
-        *Assigned to: Solver*
-
         basic description
 
         ---
@@ -80,6 +77,7 @@ describe Gitlab::JiraImport::IssueSerializer do
           updated_at: updated_at,
           created_at: created_at,
           author_id: project.creator_id,
+          assignee_ids: nil,
           label_ids: [project_label.id, group_label.id] + Label.reorder(id: :asc).last(2).pluck(:id)
         )
       end
@@ -88,6 +86,7 @@ describe Gitlab::JiraImport::IssueSerializer do
         expect(Issue.new(subject)).to be_valid
       end
 
+      context 'labels' do
         it 'creates all missing labels (on project level)' do
           expect { subject }.to change { Label.count }.from(3).to(5)
 
@@ -108,6 +107,91 @@ describe Gitlab::JiraImport::IssueSerializer do
         end
       end
 
+      context 'author' do
+        context 'when reporter maps to a GitLab user who is a project member' do
+          let!(:user) { create(:user, email: 'reporter@example.com') }
+
+          it 'sets the issue author to the mapped user' do
+            project.add_developer(user)
+
+            expect(subject[:author_id]).to eq(user.id)
+          end
+        end
+
+        context 'when reporter maps to a GitLab user who is not a project member' do
+          let!(:user) { create(:user, email: 'reporter@example.com') }
+
+          it 'defaults the issue author to project creator' do
+            expect(subject[:author_id]).to eq(project.creator.id)
+          end
+        end
+
+        context 'when reporter does not map to a GitLab user' do
+          it 'defaults the issue author to project creator' do
+            expect(subject[:author_id]).to eq(project.creator.id)
+          end
+        end
+
+        context 'when reporter field is empty' do
+          let(:reporter) { nil }
+
+          it 'defaults the issue author to project creator' do
+            expect(subject[:author_id]).to eq(project.creator.id)
+          end
+        end
+
+        context 'when reporter field is missing email address' do
+          let(:reporter) { double(name: 'Reporter', emailAddress: nil) }
+
+          it 'defaults the issue author to project creator' do
+            expect(subject[:author_id]).to eq(project.creator.id)
+          end
+        end
+      end
+
+      context 'assignee' do
+        context 'when assignee maps to a GitLab user who is a project member' do
+          let!(:user) { create(:user, email: 'assignee@example.com') }
+
+          it 'sets the issue assignees to the mapped user' do
+            project.add_developer(user)
+
+            expect(subject[:assignee_ids]).to eq([user.id])
+          end
+        end
+
+        context 'when assignee maps to a GitLab user who is not a project member' do
+          let!(:user) { create(:user, email: 'assignee@example.com') }
+
+          it 'leaves the assignee empty' do
+            expect(subject[:assignee_ids]).to be_nil
+          end
+        end
+
+        context 'when assignee does not map to a GitLab user' do
+          it 'leaves the assignee empty' do
+            expect(subject[:assignee_ids]).to be_nil
+          end
+        end
+
+        context 'when assginee field is empty' do
+          let(:assignee) { nil }
+
+          it 'leaves the assignee empty' do
+            expect(subject[:assignee_ids]).to be_nil
+          end
+        end
+
+        context 'when assginee field is missing email address' do
+          let(:assignee) { double(name: 'Assignee', emailAddress: nil) }
+
+          it 'leaves the assignee empty' do
+            expect(subject[:assignee_ids]).to be_nil
+          end
+        end
+      end
+    end
+
     context 'with done status' do
       let(:jira_status) { 'done' }