Merge branch 'backport_jira' into 'master'

Backport JIRA service

Fixes #3839 

Move EE JIRA functionality back to CE.

- [x] Make it function in manual testing
- [x] Migrate JIRA-specific tests
- [x] Tests pass
- [x] Migrate documentation
- [x] Rollback to previous CE JIRA integration locally, activate on a project then try to migrate db and see if integration still works.
- [x] Final EE search for JIRA references

See merge request !2146

31 files changed, 875 insertions, 20 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 422c6f07b15..ab8a958b019 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -19,6 +19,7 @@ v 8.3.0 (unreleased)
   - Fix 500 error when update group member permission
   - Trim leading and trailing whitespace of milestone and issueable titles (Jose Corcuera)
   - Recognize issue/MR/snippet/commit links as references
+  - Backport JIRA features from EE to CE
   - Add ignore whitespace change option to commit view
   - Fire update hook from GitLab
   - Style warning about mentioning many people in a comment
diff --git a/app/controllers/projects/services_controller.rb b/app/controllers/projects/services_controller.rb
index 6e7590260ff..8b2577aebe1 100644
--- a/app/controllers/projects/services_controller.rb
+++ b/app/controllers/projects/services_controller.rb
@@ -1,5 +1,5 @@
 class Projects::ServicesController < Projects::ApplicationController
-  ALLOWED_PARAMS = [:title, :token, :type, :active, :api_key, :api_version, :subdomain,
+  ALLOWED_PARAMS = [:title, :token, :type, :active, :api_key, :api_url, :api_version, :subdomain,
                     :room, :recipients, :project_url, :webhook,
                     :user_key, :device, :priority, :sound, :bamboo_url, :username, :password,
                     :build_key, :server, :teamcity_url, :drone_url, :build_type,
@@ -10,7 +10,8 @@ class Projects::ServicesController < Projects::ApplicationController
                     :notify_only_broken_builds, :add_pusher,
                     :send_from_committer_email, :disable_diffs, :external_wiki_url,
                     :notify, :color,
-                    :server_host, :server_port, :default_irc_uri, :enable_ssl_verification]
+                    :server_host, :server_port, :default_irc_uri, :enable_ssl_verification,
+                    :jira_issue_transition_id]
 
   # Parameters to ignore if no value is specified
   FILTER_BLANK_PARAMS = [:password]
diff --git a/app/models/jira_issue.rb b/app/models/jira_issue.rb
new file mode 100644
index 00000000000..5b21aac5e43
--- /dev/null
+++ b/app/models/jira_issue.rb
@@ -0,0 +1,2 @@
+class JiraIssue < ExternalIssue
+end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index d7430d36c41..ac25d38eb63 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -335,7 +335,7 @@ class MergeRequest < ActiveRecord::Base
       issues = commits.flat_map { |c| c.closes_issues(current_user) }
       issues.push(*Gitlab::ClosingIssueExtractor.new(project, current_user).
                   closed_by_message(description))
-      issues.uniq
+      issues.uniq(&:id)
     else
       []
     end
diff --git a/app/models/project.rb b/app/models/project.rb
index 13fd383237c..b28a7ca429c 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -499,6 +499,10 @@ class Project < ActiveRecord::Base
     @ci_service ||= ci_services.find(&:activated?)
   end
 
+  def jira_tracker?
+    issues_tracker.to_param == 'jira'
+  end
+
   def avatar_type
     unless self.avatar.image?
       self.errors.add :avatar, 'only images allowed'
@@ -799,6 +803,10 @@ class Project < ActiveRecord::Base
     false
   end
 
+  def jira_tracker_active?
+    jira_tracker? && jira_service.active
+  end
+
   def ci_commit(sha)
     ci_commits.find_by(sha: sha)
   end
diff --git a/app/models/project_services/jira_service.rb b/app/models/project_services/jira_service.rb
index 35e30b1cb0b..e216f406e1c 100644
--- a/app/models/project_services/jira_service.rb
+++ b/app/models/project_services/jira_service.rb
@@ -19,9 +19,24 @@
 #
 
 class JiraService < IssueTrackerService
+  include HTTParty
   include Gitlab::Application.routes.url_helpers
 
-  prop_accessor :title, :description, :project_url, :issues_url, :new_issue_url
+  DEFAULT_API_VERSION = 2
+
+  prop_accessor :username, :password, :api_url, :jira_issue_transition_id,
+                :title, :description, :project_url, :issues_url, :new_issue_url
+
+  before_validation :set_api_url, :set_jira_issue_transition_id
+
+  before_update :reset_password
+
+  def reset_password
+    # don't reset the password if a new one is provided
+    if api_url_changed? && !password_touched?
+      self.password = nil
+    end
+  end
 
   def help
     line1 = 'Setting `project_url`, `issues_url` and `new_issue_url` will '\
@@ -54,4 +69,228 @@ class JiraService < IssueTrackerService
   def to_param
     'jira'
   end
+
+  def fields
+    super.push(
+      { type: 'text', name: 'api_url', placeholder: 'https://jira.example.com/rest/api/2' },
+      { type: 'text', name: 'username', placeholder: '' },
+      { type: 'password', name: 'password', placeholder: '' },
+      { type: 'text', name: 'jira_issue_transition_id', placeholder: '2' }
+    )
+  end
+
+  def execute(push, issue = nil)
+    if issue.nil?
+      # No specific issue, that means
+      # we just want to test settings
+      test_settings
+    else
+      close_issue(push, issue)
+    end
+  end
+
+  def create_cross_reference_note(mentioned, noteable, author)
+    issue_name = mentioned.id
+    project = self.project
+    noteable_name = noteable.class.name.underscore.downcase
+    noteable_id = if noteable.is_a?(Commit)
+                    noteable.id
+                  else
+                    noteable.iid
+                  end
+
+    entity_url = build_entity_url(noteable_name.to_sym, noteable_id)
+
+    data = {
+      user: {
+        name: author.name,
+        url: resource_url(user_path(author)),
+      },
+      project: {
+        name: project.path_with_namespace,
+        url: resource_url(namespace_project_path(project.namespace, project))
+      },
+      entity: {
+        name: noteable_name.humanize.downcase,
+        url: entity_url
+      }
+    }
+
+    add_comment(data, issue_name)
+  end
+
+  def test_settings
+    result = JiraService.get(
+      jira_api_test_url,
+      headers: {
+        'Content-Type' => 'application/json',
+        'Authorization' => "Basic #{auth}"
+      }
+    )
+
+    case result.code
+    when 201, 200
+      Rails.logger.info("#{self.class.name} SUCCESS #{result.code}: Successfully connected to #{api_url}.")
+      true
+    else
+      Rails.logger.info("#{self.class.name} ERROR #{result.code}: #{result.parsed_response}")
+      false
+    end
+  rescue Errno::ECONNREFUSED => e
+    Rails.logger.info "#{self.class.name} ERROR: #{e.message}. API URL: #{api_url}."
+    false
+  end
+
+  private
+
+  def build_api_url_from_project_url
+    server = URI(project_url)
+    default_ports = [["http",80],["https",443]].include?([server.scheme,server.port])
+    server_url = "#{server.scheme}://#{server.host}"
+    server_url.concat(":#{server.port}") unless default_ports
+    "#{server_url}/rest/api/#{DEFAULT_API_VERSION}"
+  rescue
+    "" # looks like project URL was not valid
+  end
+
+  def set_api_url
+    self.api_url = build_api_url_from_project_url if self.api_url.blank?
+  end
+
+  def set_jira_issue_transition_id
+    self.jira_issue_transition_id ||= "2"
+  end
+
+  def close_issue(entity, issue)
+    commit_id = if entity.is_a?(Commit)
+                  entity.id
+                elsif entity.is_a?(MergeRequest)
+                  entity.last_commit.id
+                end
+    commit_url = build_entity_url(:commit, commit_id)
+
+    # Depending on the JIRA project's workflow, a comment during transition
+    # may or may not be allowed. Split the operation in to two calls so the
+    # comment always works.
+    transition_issue(issue)
+    add_issue_solved_comment(issue, commit_id, commit_url)
+  end
+
+  def transition_issue(issue)
+    message = {
+      transition: {
+        id: jira_issue_transition_id
+      }
+    }
+    send_message(close_issue_url(issue.iid), message.to_json)
+  end
+
+  def add_issue_solved_comment(issue, commit_id, commit_url)
+    comment = {
+      body: "Issue solved with [#{commit_id}|#{commit_url}]."
+    }
+
+    send_message(comment_url(issue.iid), comment.to_json)
+  end
+
+  def add_comment(data, issue_name)
+    url = comment_url(issue_name)
+    user_name = data[:user][:name]
+    user_url = data[:user][:url]
+    entity_name = data[:entity][:name]
+    entity_url = data[:entity][:url]
+    project_name = data[:project][:name]
+
+    message = {
+      body: "[#{user_name}|#{user_url}] mentioned this issue in [a #{entity_name} of #{project_name}|#{entity_url}]."
+    }
+
+    unless existing_comment?(issue_name, message[:body])
+      send_message(url, message.to_json)
+    end
+  end
+
+
+  def auth
+    require 'base64'
+    Base64.urlsafe_encode64("#{self.username}:#{self.password}")
+  end
+
+  def send_message(url, message)
+    result = JiraService.post(
+      url,
+      body: message,
+      headers: {
+        'Content-Type' => 'application/json',
+        'Authorization' => "Basic #{auth}"
+      }
+    )
+
+    message = case result.code
+              when 201, 200, 204
+                "#{self.class.name} SUCCESS #{result.code}: Successfully posted to #{url}."
+              when 401
+                "#{self.class.name} ERROR 401: Unauthorized. Check the #{self.username} credentials and JIRA access permissions and try again."
+              else
+                "#{self.class.name} ERROR #{result.code}: #{result.parsed_response}"
+              end
+
+    Rails.logger.info(message)
+    message
+  rescue URI::InvalidURIError, Errno::ECONNREFUSED => e
+    Rails.logger.info "#{self.class.name} ERROR: #{e.message}. Hostname: #{url}."
+  end
+
+  def existing_comment?(issue_name, new_comment)
+    result = JiraService.get(
+      comment_url(issue_name),
+      headers: {
+        'Content-Type' => 'application/json',
+        'Authorization' => "Basic #{auth}"
+      }
+    )
+
+    case result.code
+    when 201, 200
+      existing_comments = JSON.parse(result.body)['comments']
+
+      if existing_comments.present?
+        return existing_comments.map { |comment| comment['body'].include?(new_comment) }.any?
+      end
+    end
+
+    false
+  rescue JSON::ParserError
+    false
+  end
+
+  def resource_url(resource)
+    "#{Settings.gitlab['url'].chomp("/")}#{resource}"
+  end
+
+  def build_entity_url(entity_name, entity_id)
+    resource_url(
+      polymorphic_url(
+        [
+          self.project.namespace.becomes(Namespace),
+          self.project,
+          entity_name
+        ],
+        id: entity_id,
+        routing_type: :path
+      )
+    )
+  end
+
+  def close_issue_url(issue_name)
+    "#{self.api_url}/issue/#{issue_name}/transitions"
+  end
+
+  def comment_url(issue_name)
+    "#{self.api_url}/issue/#{issue_name}/comment"
+  end
+
+  def jira_api_test_url
+    "#{self.api_url}/myself"
+  end
 end
diff --git a/app/services/issues/close_service.rb b/app/services/issues/close_service.rb
index 3d85f97b7e5..a1a20e47681 100644
--- a/app/services/issues/close_service.rb
+++ b/app/services/issues/close_service.rb
@@ -1,6 +1,11 @@
 module Issues
   class CloseService < Issues::BaseService
     def execute(issue, commit = nil)
+      if project.jira_tracker? && project.jira_service.active
+        project.jira_service.execute(commit, issue)
+        return issue
+      end
+
       if project.default_issues_tracker? && issue.close
         event_service.close_issue(issue, current_user)
         create_note(issue, commit)
diff --git a/app/services/system_note_service.rb b/app/services/system_note_service.rb
index 6975b2ee55b..98a71cbf1ad 100644
--- a/app/services/system_note_service.rb
+++ b/app/services/system_note_service.rb
@@ -241,9 +241,14 @@ class SystemNoteService
       note_options.merge!(noteable: noteable)
     end
 
-    create_note(note_options)
+    if noteable.is_a?(ExternalIssue)
+      noteable.project.issues_tracker.create_cross_reference_note(noteable, mentioner, author)
+    else
+      create_note(note_options)
+    end
   end
 
+
   def self.cross_reference?(note_text)
     note_text.start_with?(cross_reference_note_prefix)
   end
@@ -259,7 +264,7 @@ class SystemNoteService
   #
   # Returns Boolean
   def self.cross_reference_disallowed?(noteable, mentioner)
-    return true if noteable.is_a?(ExternalIssue)
+    return true if noteable.is_a?(ExternalIssue) && !noteable.project.jira_tracker_active?
     return false unless mentioner.is_a?(MergeRequest)
     return false unless noteable.is_a?(Commit)
 
diff --git a/config/initializers/1_settings.rb b/config/initializers/1_settings.rb
index 63d8ae17436..d3d27c762aa 100644
--- a/config/initializers/1_settings.rb
+++ b/config/initializers/1_settings.rb
@@ -164,7 +164,7 @@ Settings.gitlab['signin_enabled'] ||= true if Settings.gitlab['signin_enabled'].
 Settings.gitlab['twitter_sharing_enabled'] ||= true if Settings.gitlab['twitter_sharing_enabled'].nil?
 Settings.gitlab['restricted_visibility_levels'] = Settings.send(:verify_constant_array, Gitlab::VisibilityLevel, Settings.gitlab['restricted_visibility_levels'], [])
 Settings.gitlab['username_changing_enabled'] = true if Settings.gitlab['username_changing_enabled'].nil?
-Settings.gitlab['issue_closing_pattern'] = '((?:[Cc]los(?:e[sd]?|ing)|[Ff]ix(?:e[sd]|ing)?|[Rr]esolv(?:e[sd]?|ing)) +(?:(?:issues? +)?%{issue_ref}(?:(?:, *| +and +)?))+)' if Settings.gitlab['issue_closing_pattern'].nil?
+Settings.gitlab['issue_closing_pattern'] = '((?:[Cc]los(?:e[sd]?|ing)|[Ff]ix(?:e[sd]|ing)?|[Rr]esolv(?:e[sd]?|ing)) +(?:(?:issues? +)?%{issue_ref}(?:(?:, *| +and +)?)|([A-Z]*-\d*))+)' if Settings.gitlab['issue_closing_pattern'].nil?
 Settings.gitlab['default_projects_features'] ||= {}
 Settings.gitlab['webhook_timeout'] ||= 10
 Settings.gitlab['max_attachment_size'] ||= 10
diff --git a/db/migrate/20151012173029_set_jira_service_api_url.rb b/db/migrate/20151012173029_set_jira_service_api_url.rb
new file mode 100644
index 00000000000..2af99e0db0b
--- /dev/null
+++ b/db/migrate/20151012173029_set_jira_service_api_url.rb
@@ -0,0 +1,50 @@
+class SetJiraServiceApiUrl < ActiveRecord::Migration
+  # This migration can be performed online without errors, but some Jira API calls may be missed
+  # when doing so because api_url is not yet available.
+
+  def build_api_url_from_project_url(project_url, api_version)
+    # this is the exact logic previously used to build the Jira API URL from project_url
+    server = URI(project_url)
+    default_ports = [80, 443].include?(server.port)
+    server_url = "#{server.scheme}://#{server.host}"
+    server_url.concat(":#{server.port}") unless default_ports
+    "#{server_url}/rest/api/#{api_version}"
+  end
+
+  def get_api_version_from_api_url(api_url)
+    match = /\/rest\/api\/(?<api_version>\w+)$/.match(api_url)
+    match && match['api_version']
+  end
+
+  def change
+    reversible do |dir|
+      select_all("SELECT id, properties FROM services WHERE services.type IN ('JiraService')").each do |jira_service|
+        id = jira_service["id"]
+        properties = JSON.parse(jira_service["properties"])
+        properties_was = properties.clone
+
+        dir.up do
+          # remove api_version and set api_url
+          if properties['api_version'].present? && properties['project_url'].present?
+            begin
+              properties['api_url'] ||= build_api_url_from_project_url(properties['project_url'], properties['api_version'])
+            rescue
+              # looks like project_url was not a valid URL. Do nothing.
+            end
+          end
+          properties.delete('api_version') if properties.include?('api_version')
+        end
+
+        dir.down do
+          # remove api_url and set api_version (default to '2')
+          properties['api_version'] ||= get_api_version_from_api_url(properties['api_url']) || '2'
+          properties.delete('api_url') if properties.include?('api_url')
+        end
+
+        if properties != properties_was
+          execute("UPDATE services SET properties = '#{quote_string(properties.to_json)}' WHERE id = #{id}")
+        end
+      end
+    end
+  end
+end
diff --git a/doc/integration/README.md b/doc/integration/README.md
index eff39a626ae..8ea4111bc8a 100644
--- a/doc/integration/README.md
+++ b/doc/integration/README.md
@@ -4,6 +4,7 @@ GitLab integrates with multiple third-party services to allow external issue tra
 
 See the documentation below for details on how to configure these services.
 
+- [Jira](jira.md) Integrate with the JIRA issue tracker
 - [External issue tracker](external-issue-tracker.md) Redmine, JIRA, etc.
 - [LDAP](ldap.md) Set up sign in via LDAP
 - [OmniAuth](omniauth.md) Sign in via Twitter, GitHub, GitLab, and Google via OAuth.
diff --git a/doc/integration/jira.md b/doc/integration/jira.md
new file mode 100644
index 00000000000..624601d0fac
--- /dev/null
+++ b/doc/integration/jira.md
@@ -0,0 +1,113 @@
+# GitLab Jira integration
+
+GitLab can be configured to interact with Jira.
+Configuration happens via username and password.
+Connecting to a Jira server via CAS is not possible.
+
+Each project can be configured to connect to a different Jira instance, configuration is explained [here](#configuration).
+If you have one Jira instance you can pre-fill the settings page with a default template. To configure the template [see external issue tracker document](external-issue-tracker.md#service-template)).
+
+Once the project is connected to Jira, you can reference and close the issues in Jira directly from GitLab.
+
+
+## Table of Contents
+
+* [Referencing Jira Issues from GitLab](#referencing-jira-issues)
+* [Closing Jira Issues from GitLab](#closing-jira-issues)
+* [Configuration](#configuration)
+
+### Referencing Jira Issues
+
+When GitLab project has Jira issue tracker configured and enabled, mentioning Jira issue in GitLab will automatically add a comment in Jira issue with the link back to GitLab. This means that in comments in merge requests and commits referencing an issue, eg. `PROJECT-7`, will add a comment in Jira issue in the format:
+
+
+```
+ USER mentioned this issue in LINK_TO_THE_MENTION
+```
+
+* `USER` A user that mentioned the issue. This is the link to the user profile in GitLab.
+* `LINK_TO_THE_MENTION` Link to the origin of mention with a name of the entity where Jira issue was mentioned.
+Can be commit or merge request.
+
+
+![example of mentioning or closing the Jira issue](jira_issue_reference.png)
+
+
+### Closing Jira Issues
+
+Jira issues can be closed directly from GitLab by using trigger words, eg. `Resolves PROJECT-1`, `Closes PROJECT-1` or `Fixes PROJECT-1`, in commits and merge requests.
+When a commit which contains the trigger word in the commit message is pushed, GitLab will add a comment in the mentioned Jira issue.
+
+For example, for project named PROJECT in Jira, we implemented a new feature and created a merge request in GitLab.
+
+This feature was requested in Jira issue PROJECT-7. Merge request in GitLab contains the improvement and in merge request description we say that this merge request `Closes PROJECT-7` issue.
+
+Once this merge request is merged, Jira issue will be automatically closed with a link to the commit that resolved the issue.
+
+![A Git commit that causes the Jira issue to be closed](merge_request_close_jira.png)
+
+
+![The GitLab integration user leaves a comment on Jira](jira_service_close_issue.png)
+
+
+## Configuration
+
+### Configuring JIRA
+
+We need to create a user in JIRA which will have access to all projects that need to integrate with GitLab.
+Login to your JIRA instance as admin and under Administration go to User Management and create a new user.
+As an example, we'll create a user named `gitlab` and add it to `jira-developers` group.
+
+**It is important that the user `gitlab` has write-access to projects in JIRA**
+
+### Configuring GitLab
+
+### GitLab 7.8 EE and up with JIRA v6.x
+
+To enable JIRA integration in a project, navigate to the project Settings page and go to Services. Here you will find JIRA.
+
+Fill in the required details on the page:
+
+![Jira service page](jira_service_page.png)
+
+* `description` A name for the issue tracker (to differentiate between instances, for instance).
+* `project url` The URL to the JIRA project which is being linked to this GitLab project.
+* `issues url` The URL to the JIRA project issues overview for the project that is linked to this GitLab project.
+* `new issue url` This is the URL to create a new issue in JIRA for the project linked to this GitLab project.
+* `api url` The base URL of the JIRA API. It may be omitted, in which case GitLab will automatically use API version `2` based on the `project url`, i.e. `https://jira.example.com/rest/api/2`.
+* `username` The username of the user created in [configuring JIRA step](#configuring-jira).
+* `password` The password of the user created in [configuring JIRA step](#configuring-jira).
+* `Jira issue transition` This is the id of a transition that moves issues to a closed state. You can find this number under [JIRA workflow administration, see screenshot](jira_workflow_screenshot.png).  By default, this id is `2`. (In the example image, this is `2` as well)
+
+After saving the configuration, your GitLab project will be able to interact with the linked JIRA project.
+
+
+### GitLab 6.x-7.7 with JIRA v6.x
+
+**Note: GitLab 7.8 and up contain various integration improvements. We strongly recommend upgrading.**
+
+
+In `gitlab.yml` enable [JIRA issue tracker section by uncommenting the lines](https://gitlab.com/subscribers/gitlab-ee/blob/6-8-stable-ee/config/gitlab.yml.example#L111-115).
+This will make sure that all issues within GitLab are pointing to the JIRA issue tracker.
+
+We can also enable JIRA service that will allow us to interact with JIRA issues.
+
+For example, we can close issues in JIRA by a commit in GitLab.
+
+Go to project settings page and fill in the project name for the JIRA project:
+
+![Set the JIRA project name in GitLab to 'NEW'](jira_project_name.png)
+
+Next, go to the services page and find JIRA.
+
+![Jira services page](jira_service.png)
+
+1. Tick the active check box to enable the service.
+1. Supply the url to JIRA server, for example http://jira.sample
+1. Supply the username of a user we created under `Configuring JIRA` section, for example `gitlab`
+1. Supply the password of the user
+1. Optional: supply the JIRA api version, default is version
+1. Optional: supply the JIRA issue transition ID (issue transition to closed). This is dependant on JIRA settings, default is 2
+1. Save
+
+Now we should be able to interact with JIRA issues.
diff --git a/doc/integration/jira_issue_reference.png b/doc/integration/jira_issue_reference.png
new file mode 100644
index 00000000000..15739a22dc7
--- /dev/null
+++ b/doc/integration/jira_issue_reference.png
diff --git a/doc/integration/jira_project_name.png b/doc/integration/jira_project_name.png
new file mode 100644
index 00000000000..5986fdb63fb
--- /dev/null
+++ b/doc/integration/jira_project_name.png
diff --git a/doc/integration/jira_service.png b/doc/integration/jira_service.png
new file mode 100644
index 00000000000..1f6628c4371
--- /dev/null
+++ b/doc/integration/jira_service.png
diff --git a/doc/integration/jira_service_close_issue.png b/doc/integration/jira_service_close_issue.png
new file mode 100644
index 00000000000..67dfc6144c4
--- /dev/null
+++ b/doc/integration/jira_service_close_issue.png
diff --git a/doc/integration/jira_service_page.png b/doc/integration/jira_service_page.png
new file mode 100644
index 00000000000..69ec44e826f
--- /dev/null
+++ b/doc/integration/jira_service_page.png
diff --git a/doc/integration/jira_workflow_screenshot.png b/doc/integration/jira_workflow_screenshot.png
new file mode 100644
index 00000000000..8635a32eb68
--- /dev/null
+++ b/doc/integration/jira_workflow_screenshot.png
diff --git a/features/project/service.feature b/features/project/service.feature
index ff3e7a0b38e..3a7b8308524 100644
--- a/features/project/service.feature
+++ b/features/project/service.feature
@@ -55,6 +55,12 @@ Feature: Project Services
     And I fill email on push settings
     Then I should see email on push service settings saved
 
+  Scenario: Activate JIRA service
+    When I visit project "Shop" services page
+    And I click jira service link
+    And I fill jira settings
+    Then I should see jira service settings saved
+
   Scenario: Activate Irker (IRC Gateway) service
     When I visit project "Shop" services page
     And I click Irker service link
diff --git a/features/steps/project/services.rb b/features/steps/project/services.rb
index ed3957ca873..536199ddb4f 100644
--- a/features/steps/project/services.rb
+++ b/features/steps/project/services.rb
@@ -173,6 +173,24 @@ class Spinach::Features::ProjectServices < Spinach::FeatureSteps
     expect(find_field('Sound').find('option[selected]').value).to eq 'bike'
   end
 
+  step 'I click jira service link' do
+    click_link 'JIRA'
+  end
+
+  step 'I fill jira settings' do
+    fill_in 'Project url', with: 'http://jira.example'
+    fill_in 'Username', with: 'gitlab'
+    fill_in 'Password', with: 'gitlab'
+    fill_in 'Api url', with: 'http://jira.example/rest/api/2'
+    click_button 'Save'
+  end
+
+  step 'I should see jira service settings saved' do
+    expect(find_field('Project url').value).to eq 'http://jira.example'
+    expect(find_field('Username').value).to eq 'gitlab'
+    expect(find_field('Api url').value).to eq 'http://jira.example/rest/api/2'
+  end
+
   step 'I click Atlassian Bamboo CI service link' do
     click_link 'Atlassian Bamboo CI'
   end
diff --git a/lib/banzai/filter/external_issue_reference_filter.rb b/lib/banzai/filter/external_issue_reference_filter.rb
index f5737a7ac19..f5942740cd6 100644
--- a/lib/banzai/filter/external_issue_reference_filter.rb
+++ b/lib/banzai/filter/external_issue_reference_filter.rb
@@ -23,6 +23,18 @@ module Banzai
         end
       end
 
+      def self.referenced_by(node)
+        project = Project.find(node.attr("data-project")) rescue nil
+        return unless project
+
+        id = node.attr("data-external-issue")
+        external_issue = ExternalIssue.new(id, project)
+
+        return unless external_issue
+
+        { external_issue: external_issue }
+      end
+
       def call
         # Early return if the project isn't using an external tracker
         return doc if project.nil? || project.default_issues_tracker?
@@ -46,12 +58,14 @@ module Banzai
       def issue_link_filter(text, link_text: nil)
         project = context[:project]
 
-        self.class.references_in(text) do |match, issue|
-          url = url_for_issue(issue, project, only_path: context[:only_path])
+        self.class.references_in(text) do |match, id|
+          ExternalIssue.new(id, project)
+
+          url = url_for_issue(id, project, only_path: context[:only_path])
 
           title = escape_once("Issue in #{project.external_issue_tracker.title}")
           klass = reference_class(:issue)
-          data  = data_attribute(project: project.id)
+          data  = data_attribute(project: project.id, external_issue: id)
 
           text = link_text || match
 
diff --git a/lib/gitlab/reference_extractor.rb b/lib/gitlab/reference_extractor.rb
index 42f7c26f3c4..0a70d21b1ce 100644
--- a/lib/gitlab/reference_extractor.rb
+++ b/lib/gitlab/reference_extractor.rb
@@ -18,10 +18,20 @@ module Gitlab
       super(text, context.merge(project: project))
     end
 
-    %i(user label issue merge_request snippet commit commit_range).each do |type|
+    %i(user label merge_request snippet commit commit_range).each do |type|
       define_method("#{type}s") do
         @references[type] ||= references(type, project: project, current_user: current_user)
       end
     end
+
+    def issues
+      options = { project: project, current_user: current_user }
+
+      if project && project.jira_tracker?
+        @references[:external_issue] ||= references(:external_issue, options)
+      else
+        @references[:issue] ||= references(:issue, options)
+      end
+    end
   end
 end
diff --git a/spec/helpers/merge_requests_helper_spec.rb b/spec/helpers/merge_requests_helper_spec.rb
index 0ef1efb8bce..28fb3216f60 100644
--- a/spec/helpers/merge_requests_helper_spec.rb
+++ b/spec/helpers/merge_requests_helper_spec.rb
@@ -1,24 +1,37 @@
 require 'spec_helper'
 
 describe MergeRequestsHelper do
-  describe "#issues_sentence" do
+  describe '#issues_sentence' do
     subject { issues_sentence(issues) }
     let(:issues) do
       [build(:issue, iid: 1), build(:issue, iid: 2), build(:issue, iid: 3)]
     end
 
     it { is_expected.to eq('#1, #2, and #3') }
+
+    context 'for JIRA issues' do
+      let(:project) { create(:project) }
+      let(:issues) do
+        [
+          JiraIssue.new('JIRA-123', project),
+          JiraIssue.new('JIRA-456', project),
+          JiraIssue.new('FOOBAR-7890', project)
+        ]
+      end
+
+      it { is_expected.to eq('FOOBAR-7890, JIRA-123, and JIRA-456') }
+    end
   end
 
-  describe "#format_mr_branch_names" do
-    describe "within the same project" do
+  describe '#format_mr_branch_names' do
+    describe 'within the same project' do
       let(:merge_request) { create(:merge_request) }
       subject { format_mr_branch_names(merge_request) }
 
       it { is_expected.to eq([merge_request.source_branch, merge_request.target_branch]) }
     end
 
-    describe "within different projects" do
+    describe 'within different projects' do
       let(:project) { create(:project) }
       let(:fork_project) { create(:project, forked_from_project: project) }
       let(:merge_request) { create(:merge_request, source_project: fork_project, target_project: project) }
diff --git a/spec/lib/gitlab/reference_extractor_spec.rb b/spec/lib/gitlab/reference_extractor_spec.rb
index 66dc5d4911d..7d963795e17 100644
--- a/spec/lib/gitlab/reference_extractor_spec.rb
+++ b/spec/lib/gitlab/reference_extractor_spec.rb
@@ -97,6 +97,16 @@ describe Gitlab::ReferenceExtractor, lib: true do
     expect(extracted.first.commit_to).to eq commit
   end
 
+  context 'with an external issue tracker' do
+    let(:project) { create(:jira_project) }
+    subject { described_class.new(project, project.creator) }
+
+    it 'returns JIRA issues for a JIRA-integrated project' do
+      subject.analyze('JIRA-123 and FOOBAR-4567')
+      expect(subject.issues).to eq [JiraIssue.new('JIRA-123', project), JiraIssue.new('FOOBAR-4567', project)]
+    end
+  end
+
   context 'with a project with an underscore' do
     let(:other_project) { create(:project, path: 'test_project') }
     let(:issue) { create(:issue, project: other_project) }
diff --git a/spec/models/concerns/mentionable_spec.rb b/spec/models/concerns/mentionable_spec.rb
index 6179882e935..6653621a83e 100644
--- a/spec/models/concerns/mentionable_spec.rb
+++ b/spec/models/concerns/mentionable_spec.rb
@@ -1,5 +1,18 @@
 require 'spec_helper'
 
+describe Mentionable do
+  include Mentionable
+
+  describe :references do
+    let(:project) { create(:project) }
+
+    it 'excludes JIRA references' do
+      allow(project).to receive_messages(jira_tracker?: true)
+      expect(referenced_mentionables(project, 'JIRA-123')).to be_empty
+    end
+  end
+end
+
 describe Issue, "Mentionable" do
   describe '#mentioned_users' do
     let!(:user) { create(:user, username: 'stranger') }
diff --git a/spec/models/jira_issue_spec.rb b/spec/models/jira_issue_spec.rb
new file mode 100644
index 00000000000..1634265b439
--- /dev/null
+++ b/spec/models/jira_issue_spec.rb
@@ -0,0 +1,30 @@
+require 'spec_helper'
+
+describe JiraIssue do
+  let(:project) { create(:project) }
+  subject { JiraIssue.new('JIRA-123', project) }
+
+  describe 'id' do
+    subject { super().id }
+    it { is_expected.to eq('JIRA-123') }
+  end
+
+  describe 'iid' do
+    subject { super().iid }
+    it { is_expected.to eq('JIRA-123') }
+  end
+
+  describe 'to_s' do
+    subject { super().to_s }
+    it { is_expected.to eq('JIRA-123') }
+  end
+
+  describe :== do
+    specify { expect(subject).to eq(JiraIssue.new('JIRA-123', project)) }
+    specify { expect(subject).not_to eq(JiraIssue.new('JIRA-124', project)) }
+
+    it 'only compares with JiraIssues' do
+      expect(subject).not_to eq('JIRA-123')
+    end
+  end
+end
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 1aeba9b2b3b..e0653a8327d 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -164,6 +164,17 @@ describe MergeRequest, models: true do
 
       expect(subject.closes_issues).to include(issue2)
     end
+
+    context 'for a project with JIRA integration' do
+      let(:issue0) { JiraIssue.new('JIRA-123', subject.project) }
+      let(:issue1) { JiraIssue.new('FOOBAR-4567', subject.project) }
+
+      it 'returns sorted JiraIssues' do
+        allow(subject.project).to receive_messages(default_branch: subject.target_branch)
+
+        expect(subject.closes_issues).to eq([issue0, issue1])
+      end
+    end
   end
 
   describe "#work_in_progress?" do
diff --git a/spec/models/project_services/jira_service_spec.rb b/spec/models/project_services/jira_service_spec.rb
index 7d91ebe9ce6..2f8193170ae 100644
--- a/spec/models/project_services/jira_service_spec.rb
+++ b/spec/models/project_services/jira_service_spec.rb
@@ -26,6 +26,113 @@ describe JiraService, models: true do
     it { is_expected.to have_one :service_hook }
   end
 
+  describe "Execute" do
+    let(:user)    { create(:user) }
+    let(:project) { create(:project) }
+    let(:merge_request) { create(:merge_request) }
+
+    before do
+      @jira_service = JiraService.new
+      allow(@jira_service).to receive_messages(
+        project_id: project.id,
+        project: project,
+        service_hook: true,
+        project_url: 'http://jira.example.com',
+        username: 'gitlab_jira_username',
+        password: 'gitlab_jira_password'
+      )
+      @jira_service.save # will build API URL, as api_url was not specified above
+      @sample_data = Gitlab::PushDataBuilder.build_sample(project, user)
+      # https://github.com/bblimke/webmock#request-with-basic-authentication
+      @api_url = 'http://gitlab_jira_username:gitlab_jira_password@jira.example.com/rest/api/2/issue/JIRA-123/transitions'
+      @comment_url = 'http://gitlab_jira_username:gitlab_jira_password@jira.example.com/rest/api/2/issue/JIRA-123/comment'
+
+      WebMock.stub_request(:post, @api_url)
+      WebMock.stub_request(:post, @comment_url)
+    end
+
+    it "should call JIRA API" do
+      @jira_service.execute(merge_request, JiraIssue.new("JIRA-123", project))
+      expect(WebMock).to have_requested(:post, @comment_url).with(
+        body: /Issue solved with/
+      ).once
+    end
+
+    it "calls the api with jira_issue_transition_id" do
+      @jira_service.jira_issue_transition_id = 'this-is-a-custom-id'
+      @jira_service.execute(merge_request, JiraIssue.new("JIRA-123", project))
+      expect(WebMock).to have_requested(:post, @api_url).with(
+        body: /this-is-a-custom-id/
+      ).once
+    end
+  end
+
+  describe "Stored password invalidation" do
+    let(:project) { create(:project) }
+
+    context "when a password was previously set" do
+      before do
+        @jira_service = JiraService.create(
+          project: create(:project),
+          properties: {
+            api_url: 'http://jira.example.com/rest/api/2',
+            username: 'mic',
+            password: "password"
+          }
+        )
+      end
+
+      it "reset password if url changed" do
+        @jira_service.api_url = 'http://jira_edited.example.com/rest/api/2'
+        @jira_service.save
+        expect(@jira_service.password).to be_nil
+      end
+
+      it "does not reset password if username changed" do
+        @jira_service.username = "some_name"
+        @jira_service.save
+        expect(@jira_service.password).to eq("password")
+      end
+
+      it "does not reset password if new url is set together with password, even if it's the same password" do
+        @jira_service.api_url = 'http://jira_edited.example.com/rest/api/2'
+        @jira_service.password = 'password'
+        @jira_service.save
+        expect(@jira_service.password).to eq("password")
+        expect(@jira_service.api_url).to eq("http://jira_edited.example.com/rest/api/2")
+      end
+
+      it "should reset password if url changed, even if setter called multiple times" do
+        @jira_service.api_url = 'http://jira1.example.com/rest/api/2'
+        @jira_service.api_url = 'http://jira1.example.com/rest/api/2'
+        @jira_service.save
+        expect(@jira_service.password).to be_nil
+      end
+    end
+
+    context "when no password was previously set" do
+      before do
+        @jira_service = JiraService.create(
+          project: create(:project),
+          properties: {
+            api_url: 'http://jira.example.com/rest/api/2',
+            username: 'mic'
+          }
+        )
+      end
+
+      it "saves password if new url is set together with password" do
+        @jira_service.api_url = 'http://jira_edited.example.com/rest/api/2'
+        @jira_service.password = 'password'
+        @jira_service.save
+        expect(@jira_service.password).to eq("password")
+        expect(@jira_service.api_url).to eq("http://jira_edited.example.com/rest/api/2")
+      end
+
+    end
+  end
+
+
   describe "Validations" do
     context "active" do
       before do
@@ -78,11 +185,12 @@ describe JiraService, models: true do
 
     context 'when gitlab.yml was initialized' do
       before do
-        settings = { "jira" => {
-          "title" => "Jira",
-          "project_url" => "http://jira.sample/projects/project_a",
-          "issues_url" => "http://jira.sample/issues/:id",
-          "new_issue_url" => "http://jira.sample/projects/project_a/issues/new"
+        settings = {
+          "jira" => {
+            "title" => "Jira",
+            "project_url" => "http://jira.sample/projects/project_a",
+            "issues_url" => "http://jira.sample/issues/:id",
+            "new_issue_url" => "http://jira.sample/projects/project_a/issues/new"
           }
         }
         allow(Gitlab.config).to receive(:issues_tracker).and_return(settings)
diff --git a/spec/services/git_push_service_spec.rb b/spec/services/git_push_service_spec.rb
index a04c242cf0e..c1080ef190a 100644
--- a/spec/services/git_push_service_spec.rb
+++ b/spec/services/git_push_service_spec.rb
@@ -265,6 +265,75 @@ describe GitPushService, services: true do
         expect(Issue.find(issue.id)).to be_opened
       end
     end
+
+    # EE-only tests
+    context "for jira issue tracker" do
+      include JiraServiceHelper
+
+      let(:jira_tracker) { project.create_jira_service if project.jira_service.nil? }
+
+      before do
+        jira_service_settings
+
+        WebMock.stub_request(:post, jira_api_transition_url)
+        WebMock.stub_request(:post, jira_api_comment_url)
+        WebMock.stub_request(:get, jira_api_comment_url).to_return(body: jira_issue_comments)
+        WebMock.stub_request(:get, jira_api_test_url)
+
+        allow(closing_commit).to receive_messages({
+                                                    issue_closing_regex: Regexp.new(Gitlab.config.gitlab.issue_closing_pattern),
+                                                    safe_message: message,
+                                                    author_name: commit_author.name,
+                                                    author_email: commit_author.email
+                                                  })
+
+        allow(project.repository).to receive_messages(commits_between: [closing_commit])
+      end
+
+      after do
+        jira_tracker.destroy!
+      end
+
+      context "mentioning an issue" do
+        let(:message) { "this is some work.\n\nrelated to JIRA-1" }
+
+        it "should initiate one api call to jira server to mention the issue" do
+          service.execute(project, user, @oldrev, @newrev, @ref)
+
+          expect(WebMock).to have_requested(:post, jira_api_comment_url).with(
+            body: /mentioned this issue in/
+          ).once
+        end
+      end
+
+      context "closing an issue" do
+        let(:message) { "this is some work.\n\ncloses JIRA-1" }
+
+        it "should initiate one api call to jira server to close the issue" do
+          transition_body = {
+            transition: {
+              id: '2'
+            }
+          }.to_json
+
+          service.execute(project, user, @oldrev, @newrev, @ref)
+          expect(WebMock).to have_requested(:post, jira_api_transition_url).with(
+            body: transition_body
+          ).once
+        end
+
+        it "should initiate one api call to jira server to comment on the issue" do
+          comment_body = {
+            body: "Issue solved with [#{closing_commit.id}|http://localhost/#{project.path_with_namespace}/commit/#{closing_commit.id}]."
+          }.to_json
+
+          service.execute(project, user, @oldrev, @newrev, @ref)
+          expect(WebMock).to have_requested(:post, jira_api_comment_url).with(
+            body: comment_body
+          ).once
+        end
+      end
+    end
   end
 
   describe "empty project" do
diff --git a/spec/services/system_note_service_spec.rb b/spec/services/system_note_service_spec.rb
index 0a4f9b230e8..c9f828ae2f7 100644
--- a/spec/services/system_note_service_spec.rb
+++ b/spec/services/system_note_service_spec.rb
@@ -425,4 +425,65 @@ describe SystemNoteService, services: true do
       end
     end
   end
+
+  include JiraServiceHelper
+
+  describe 'JIRA integration' do
+    let(:project)    { create(:project) }
+    let(:author)     { create(:user) }
+    let(:issue)      { create(:issue, project: project) }
+    let(:mergereq)   { create(:merge_request, :simple, target_project: project, source_project: project) }
+    let(:jira_issue) { JiraIssue.new("JIRA-1", project)}
+    let(:jira_tracker) { project.create_jira_service if project.jira_service.nil? }
+    let(:commit)     { project.commit }
+
+    context 'in JIRA issue tracker' do
+      before do
+        jira_service_settings
+        WebMock.stub_request(:post, jira_api_comment_url)
+      end
+
+      after do
+        jira_tracker.destroy!
+      end
+
+      describe "new reference" do
+        before do
+          WebMock.stub_request(:get, jira_api_comment_url).to_return(body: jira_issue_comments)
+        end
+
+        subject { described_class.cross_reference(jira_issue, commit, author) }
+
+        it { is_expected.to eq(jira_status_message) }
+      end
+
+      describe "existing reference" do
+        before do
+          message = "[#{author.name}|http://localhost/u/#{author.username}] mentioned this issue in [a commit of #{project.path_with_namespace}|http://localhost/#{project.path_with_namespace}/commit/#{commit.id}]."
+          WebMock.stub_request(:get, jira_api_comment_url).to_return(body: "{\"comments\":[{\"body\":\"#{message}\"}]}")
+        end
+
+        subject { described_class.cross_reference(jira_issue, commit, author) }
+        it { is_expected.not_to eq(jira_status_message) }
+      end
+    end
+
+    context 'issue from an issue' do
+      context 'in JIRA issue tracker' do
+        before do
+          jira_service_settings
+          WebMock.stub_request(:post, jira_api_comment_url)
+          WebMock.stub_request(:get, jira_api_comment_url).to_return(body: jira_issue_comments)
+        end
+
+        after do
+          jira_tracker.destroy!
+        end
+
+        subject { described_class.cross_reference(jira_issue, issue, author) }
+
+        it { is_expected.to eq(jira_status_message) }
+      end
+    end
+  end
 end
diff --git a/spec/support/jira_service_helper.rb b/spec/support/jira_service_helper.rb
new file mode 100644
index 00000000000..a3f496359b1
--- /dev/null
+++ b/spec/support/jira_service_helper.rb
@@ -0,0 +1,67 @@
+module JiraServiceHelper
+
+  def jira_service_settings
+    properties = {
+      "title"=>"JIRA tracker",
+      "project_url"=>"http://jira.example/issues/?jql=project=A",
+      "issues_url"=>"http://jira.example/browse/JIRA-1",
+      "new_issue_url"=>"http://jira.example/secure/CreateIssue.jspa",
+      "api_url"=>"http://jira.example/rest/api/2"
+    }
+
+    jira_tracker.update_attributes(properties: properties, active: true)
+  end
+
+  def jira_status_message
+    "JiraService SUCCESS 200: Successfully posted to #{jira_api_comment_url}."
+  end
+
+  def jira_issue_comments
+    "{\"startAt\":0,\"maxResults\":11,\"total\":11,
+      \"comments\":[{\"self\":\"http://0.0.0.0:4567/rest/api/2/issue/10002/comment/10609\",
+      \"id\":\"10609\",\"author\":{\"self\":\"http://0.0.0.0:4567/rest/api/2/user?username=gitlab\",
+      \"name\":\"gitlab\",\"emailAddress\":\"gitlab@example.com\",
+      \"avatarUrls\":{\"16x16\":\"http://0.0.0.0:4567/secure/useravatar?size=xsmall&avatarId=10122\",
+      \"24x24\":\"http://0.0.0.0:4567/secure/useravatar?size=small&avatarId=10122\",
+      \"32x32\":\"http://0.0.0.0:4567/secure/useravatar?size=medium&avatarId=10122\",
+      \"48x48\":\"http://0.0.0.0:4567/secure/useravatar?avatarId=10122\"},
+      \"displayName\":\"GitLab\",\"active\":true},
+      \"body\":\"[Administrator|http://localhost:3000/u/root] mentioned JIRA-1 in Merge request of [gitlab-org/gitlab-test|http://localhost:3000/gitlab-org/gitlab-test/merge_requests/2].\",
+      \"updateAuthor\":{\"self\":\"http://0.0.0.0:4567/rest/api/2/user?username=gitlab\",\"name\":\"gitlab\",\"emailAddress\":\"gitlab@example.com\",
+      \"avatarUrls\":{\"16x16\":\"http://0.0.0.0:4567/secure/useravatar?size=xsmall&avatarId=10122\",
+      \"24x24\":\"http://0.0.0.0:4567/secure/useravatar?size=small&avatarId=10122\",
+      \"32x32\":\"http://0.0.0.0:4567/secure/useravatar?size=medium&avatarId=10122\",
+      \"48x48\":\"http://0.0.0.0:4567/secure/useravatar?avatarId=10122\"},\"displayName\":\"GitLab\",\"active\":true},
+      \"created\":\"2015-02-12T22:47:07.826+0100\",
+      \"updated\":\"2015-02-12T22:47:07.826+0100\"},
+     {\"self\":\"http://0.0.0.0:4567/rest/api/2/issue/10002/comment/10700\",
+        \"id\":\"10700\",\"author\":{\"self\":\"http://0.0.0.0:4567/rest/api/2/user?username=gitlab\",
+        \"name\":\"gitlab\",\"emailAddress\":\"gitlab@example.com\",
+        \"avatarUrls\":{\"16x16\":\"http://0.0.0.0:4567/secure/useravatar?size=xsmall&avatarId=10122\",
+        \"24x24\":\"http://0.0.0.0:4567/secure/useravatar?size=small&avatarId=10122\",
+        \"32x32\":\"http://0.0.0.0:4567/secure/useravatar?size=medium&avatarId=10122\",
+        \"48x48\":\"http://0.0.0.0:4567/secure/useravatar?avatarId=10122\"},\"displayName\":\"GitLab\",\"active\":true},
+        \"body\":\"[Administrator|http://localhost:3000/u/root] mentioned this issue in [a commit of h5bp/html5-boilerplate|http://localhost:3000/h5bp/html5-boilerplate/commit/2439f77897122fbeee3bfd9bb692d3608848433e].\",
+        \"updateAuthor\":{\"self\":\"http://0.0.0.0:4567/rest/api/2/user?username=gitlab\",\"name\":\"gitlab\",\"emailAddress\":\"gitlab@example.com\",
+        \"avatarUrls\":{\"16x16\":\"http://0.0.0.0:4567/secure/useravatar?size=xsmall&avatarId=10122\",
+        \"24x24\":\"http://0.0.0.0:4567/secure/useravatar?size=small&avatarId=10122\",
+        \"32x32\":\"http://0.0.0.0:4567/secure/useravatar?size=medium&avatarId=10122\",
+        \"48x48\":\"http://0.0.0.0:4567/secure/useravatar?avatarId=10122\"},\"displayName\":\"GitLab\",\"active\":true},
+        \"created\":\"2015-04-01T03:45:55.667+0200\",
+        \"updated\":\"2015-04-01T03:45:55.667+0200\"
+      }
+      ]}"
+  end
+
+  def jira_api_comment_url
+    'http://jira.example/rest/api/2/issue/JIRA-1/comment'
+  end
+
+  def jira_api_transition_url
+    'http://jira.example/rest/api/2/issue/JIRA-1/transitions'
+  end
+
+  def jira_api_test_url
+    'http://jira.example/rest/api/2/myself'
+  end
+end