Add method to JiraService to create issue in Jira using API

This change adds new method to JiraService that creates issue in Jira
using Jira API.

ee/app/models/project_services/ee/jira_service.rb

@@ -42,6 +42,26 @@ module EE
       "#{url}/secure/CreateIssueDetails!init.jspa?pid=#{jira_project_id}&issuetype=#{vulnerabilities_issuetype}&summary=#{escaped_summary}&description=#{escaped_description}"[0..MAX_URL_LENGTH]
     end
 
+    def create_issue(summary, description)
+      return if client_url.blank?
+
+      jira_request do
+        issue = client.Issue.build
+        issue.save!(
+          fields: {
+            project: { id: jira_project_id },
+            issuetype: { id: vulnerabilities_issuetype },
+            summary: summary,
+            description: description
+          }
+        )
+        issue
+      rescue JIRA::HTTPError => e
+        issue.attrs[:errors] = ::Gitlab::Json.parse(e.response.read_body)
+        issue
+      end
+    end
+
     def jira_project_id
       strong_memoize(:jira_project_id) do
         client_url.present? ? jira_request { client.Project.find(project_key).id } : nil

ee/spec/models/project_services/jira_service_spec.rb

@@ -143,6 +143,48 @@ RSpec.describe JiraService do
     end
   end
 
+  describe '#create_issue' do
+    let(:jira_service) { described_class.new(options) }
+    let(:issue_info) { { 'id': '10000' } }
+
+    before do
+      allow(jira_service).to receive(:jira_project_id).and_return('11223')
+      allow(jira_service).to receive(:vulnerabilities_issuetype).and_return('10001')
+    end
+
+    context 'when there is no issues in Jira API' do
+      before do
+        WebMock.stub_request(:post, 'http://jira.example.com/rest/api/2/issue').with(basic_auth: %w(gitlab_jira_username gitlab_jira_password)).to_return(body: issue_info.to_json)
+      end
+
+      it 'creates issue in Jira API' do
+        issue = jira_service.create_issue("Special Summary!?", "*ID*: 2\n_Issue_: !")
+
+        expect(WebMock).to have_requested(:post, 'http://jira.example.com/rest/api/2/issue').with(
+          body: { fields: { project: { id: '11223' }, issuetype: { id: '10001' }, summary: 'Special Summary!?', description: "*ID*: 2\n_Issue_: !" } }.to_json
+        ).once
+        expect(issue.id).to eq('10000')
+      end
+    end
+
+    context 'when there is an error in Jira' do
+      let(:errors) { { 'errorMessages' => [], 'errors' => { 'summary' => 'You must specify a summary of the issue.' } } }
+
+      before do
+        WebMock.stub_request(:post, 'http://jira.example.com/rest/api/2/issue').with(basic_auth: %w(gitlab_jira_username gitlab_jira_password)).to_return(status: [400, 'Bad Request'], body: errors.to_json)
+      end
+
+      it 'returns issue with errors' do
+        issue = jira_service.create_issue('', "*ID*: 2\n_Issue_: !")
+
+        expect(WebMock).to have_requested(:post, 'http://jira.example.com/rest/api/2/issue').with(
+          body: { fields: { project: { id: '11223' }, issuetype: { id: '10001' }, summary: '', description: "*ID*: 2\n_Issue_: !" } }.to_json
+        ).once
+        expect(issue.attrs[:errors]).to eq(errors)
+      end
+    end
+  end
+
   describe '#new_issue_url_with_predefined_fields' do
     before do
       allow(jira_service).to receive(:jira_project_id).and_return('11223')