Map jira metadata fields to gitlab issue

lib/gitlab/jira_import/issue_serializer.rb

@@ -4,12 +4,14 @@ module Gitlab
   module JiraImport
     class IssueSerializer
       attr_reader :jira_issue, :project, :params, :formatter
+      attr_accessor :metadata
 
       def initialize(project, jira_issue, params = {})
         @jira_issue = jira_issue
         @project = project
         @params = params
         @formatter = Gitlab::ImportFormatter.new
+        @metadata = []
       end
 
       def execute
@@ -36,6 +38,7 @@ module Gitlab
         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 << add_metadata
 
         body.join
       end
@@ -48,6 +51,50 @@ module Gitlab
           Issuable::STATE_ID_MAP[:opened]
         end
       end
+
+      def add_metadata
+        add_field(%w(issuetype name), 'Issue type')
+        add_field(%w(priority name), 'Priority')
+        add_labels
+        add_field('environment', 'Environment')
+        add_field('duedate', 'Due date')
+        add_parent
+        add_versions
+
+        return if metadata.empty?
+
+        metadata.join("\n").prepend("\n\n---\n\n**Issue metadata**\n\n")
+      end
+
+      def add_field(keys, field_label)
+        value = fields.dig(*keys)
+        return if value.blank?
+
+        metadata << "- #{field_label}: #{value}"
+      end
+
+      def add_labels
+        return if fields['labels'].blank?
+
+        metadata << "- Labels: #{fields['labels'].join(', ')}"
+      end
+
+      def add_parent
+        parent_issue_key = fields.dig('parent', 'key')
+        return if parent_issue_key.blank?
+
+        metadata << "- Parent issue: [#{parent_issue_key}] #{fields['parent']['fields']['summary']}"
+      end
+
+      def add_versions
+        return if fields['fixVersions'].blank?
+
+        metadata << "- Fix versions: #{fields['fixVersions'].map { |version| version['name'] }.join(', ')}"
+      end
+
+      def fields
+        jira_issue.fields
+      end
     end
   end
 end

spec/lib/gitlab/jira_import/issue_serializer_spec.rb

@@ -14,6 +14,29 @@ describe Gitlab::JiraImport::IssueSerializer do
     let(:updated_at) { '2020-01-10 20:00:00' }
     let(:assignee) { double(displayName: 'Solver') }
     let(:jira_status) { 'new' }
+
+    let(:parent_field) do
+      { 'key' => 'FOO-2', 'id' => '1050', 'fields' => { 'summary' => 'parent issue FOO' } }
+    end
+    let(:issue_type_field) { { 'name' => 'Task' } }
+    let(:fix_versions_field) { [{ 'name' => '1.0' }, { 'name' => '1.1' }] }
+    let(:priority_field) { { 'name' => 'Medium' } }
+    let(:labels_field) { %w(bug backend) }
+    let(:environment_field) { 'staging' }
+    let(:duedate_field) { '2020-03-01' }
+
+    let(:fields) do
+      {
+        'parent' => parent_field,
+        'issuetype' => issue_type_field,
+        'fixVersions' => fix_versions_field,
+        'priority' => priority_field,
+        'labels' => labels_field,
+        'environment' => environment_field,
+        'duedate' => duedate_field
+      }
+    end
+
     let(:jira_issue) do
       double(
         id: '1234',
@@ -24,11 +47,15 @@ describe Gitlab::JiraImport::IssueSerializer do
         updated: updated_at,
         assignee: assignee,
         reporter: double(displayName: 'Reporter'),
-        status: double(statusCategory: { 'key' => jira_status })
+        status: double(statusCategory: { 'key' => jira_status }),
+        fields: fields
       )
     end
+
     let(:params) { { iid: iid } }
 
+    subject { described_class.new(project, jira_issue, params).execute }
+
     let(:expected_description) do
       <<~MD
         *Created by: Reporter*
@@ -36,11 +63,21 @@ describe Gitlab::JiraImport::IssueSerializer do
         *Assigned to: Solver*
 
         basic description
+
+        ---
+
+        **Issue metadata**
+
+        - Issue type: Task
+        - Priority: Medium
+        - Labels: bug, backend
+        - Environment: staging
+        - Due date: 2020-03-01
+        - Parent issue: [FOO-2] parent issue FOO
+        - Fix versions: 1.0, 1.1
       MD
     end
 
-    subject { described_class.new(project, jira_issue, params).execute }
-
     context 'attributes setting' do
       it 'sets the basic attributes' do
         expect(subject).to eq(
@@ -54,6 +91,54 @@ describe Gitlab::JiraImport::IssueSerializer do
           author_id: project.creator_id
         )
       end
+
+      context 'when some metadata fields are missing' do
+        let(:assignee) { nil }
+        let(:parent_field) { nil }
+        let(:fix_versions_field) { [] }
+        let(:labels_field) { [] }
+        let(:environment_field) { nil }
+        let(:duedate_field) { '2020-03-01' }
+
+        it 'skips the missing fields' do
+          expected_description = <<~MD
+            *Created by: Reporter*
+
+            basic description
+
+            ---
+
+            **Issue metadata**
+
+            - Issue type: Task
+            - Priority: Medium
+            - Due date: 2020-03-01
+          MD
+
+          expect(subject[:description]).to eq(expected_description.strip)
+        end
+      end
+
+      context 'when all metadata fields are missing' do
+        let(:assignee) { nil }
+        let(:parent_field) { nil }
+        let(:issue_type_field) { nil }
+        let(:fix_versions_field) { [] }
+        let(:priority_field) { nil }
+        let(:labels_field) { [] }
+        let(:environment_field) { nil }
+        let(:duedate_field) { nil }
+
+        it 'skips the whole metadata secction' do
+          expected_description = <<~MD
+            *Created by: Reporter*
+
+            basic description
+          MD
+
+          expect(subject[:description]).to eq(expected_description.strip)
+        end
+      end
     end
 
     context 'with done status' do
@@ -64,20 +149,6 @@ describe Gitlab::JiraImport::IssueSerializer do
       end
     end
 
-    context 'without the assignee' do
-      let(:assignee) { nil }
-
-      it 'does not include assignee in the description' do
-        expected_description = <<~MD
-          *Created by: Reporter*
-
-          basic description
-        MD
-
-        expect(subject[:description]).to eq(expected_description.strip)
-      end
-    end
-
     context 'without the iid' do
       let(:params) { {} }