Add project service documentation and update integration documentation

app/controllers/admin/services_controller.rb

 class Admin::ServicesController < Admin::ApplicationController
+  include ServiceParams
+
   before_action :service, only: [:edit, :update]
   def index
@@ -37,18 +39,4 @@ class Admin::ServicesController < Admin::ApplicationController
   def service
     @service ||= Service.where(id: params[:id], template: true).first
   end
-
-  def application_services_params
-    dynamic_params = []
-    dynamic_params.concat(@service.event_channel_names) if @service.is_a?(SlackService)
-
-    application_services_params = params.permit(:id,
-      service: Projects::ServicesController::ALLOWED_PARAMS + dynamic_params)
-    if application_services_params[:service].is_a?(Hash)
-      Projects::ServicesController::FILTER_BLANK_PARAMS.each do |param|
-        application_services_params[:service].delete(param) if application_services_params[:service][param].blank?
-      end
-    end
-    application_services_params
-  end
 end

app/controllers/concerns/service_params.rb

+module ServiceParams
+  extend ActiveSupport::Concern
+
+  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,
+                    :description, :issues_url, :new_issue_url, :restrict_to_branch, :channel,
+                    :colorize_messages, :channels,
+                    :push_events, :issues_events, :merge_requests_events, :tag_push_events,
+                    :note_events, :build_events, :wiki_page_events,
+                    :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,
+                    :jira_issue_transition_id]
+
+  # Parameters to ignore if no value is specified
+  FILTER_BLANK_PARAMS = [:password]
+
+  def application_services_params
+    dynamic_params = []
+    dynamic_params.concat(@service.event_channel_names)
+
+    application_services_params = params.permit(:id, service: ALLOWED_PARAMS + dynamic_params)
+
+    if application_services_params[:service].is_a?(Hash)
+      FILTER_BLANK_PARAMS.each do |param|
+        application_services_params[:service].delete(param) if application_services_params[:service][param].blank?
+      end
+    end
+
+    application_services_params
+  end
+end

app/controllers/projects/services_controller.rb

 class Projects::ServicesController < Projects::ApplicationController
-  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,
-                    :description, :issues_url, :new_issue_url, :restrict_to_branch, :channel,
-                    :colorize_messages, :channels,
-                    :push_events, :issues_events, :merge_requests_events, :tag_push_events,
-                    :note_events, :build_events, :wiki_page_events,
-                    :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,
-                    :jira_issue_transition_id]
-
-  # Parameters to ignore if no value is specified
-  FILTER_BLANK_PARAMS = [:password]
+  include ServiceParams
   # Authorize
   before_action :authorize_admin_project!

app/helpers/services_helper.rb

@@ -2,7 +2,7 @@ module ServicesHelper
   def service_event_description(event)
     case event
     when "push"
-      "Webhook will triggered by a push to the repository"
+      "Webhook will be triggered by a push to the repository"
     when "tag_push"
       "Webhook will be triggered when a new tag is pushed to the repository"
     when "note"
@@ -19,7 +19,7 @@ module ServicesHelper
   end
   def service_event_field_name(event)
-    event = event.pluralize if %w(merge_request issue).include?(event)
+    event = event.pluralize if %w[merge_request issue].include?(event)
     "#{event}_events"
   end
 end

app/models/project_services/slack_service.rb

@@ -5,7 +5,7 @@ class SlackService < Service
   def initialize_properties
     # Custom serialized properties initialization
-    self.supported_events.each { |event| self.class.prop_accessor event_channel_name(event) }
+    self.supported_events.each { |event| self.class.prop_accessor(event_channel_name(event)) }
     if properties.nil?
       self.properties = {}
@@ -36,7 +36,7 @@ class SlackService < Service
       [
         { type: 'text', name: 'webhook',   placeholder: 'https://hooks.slack.com/services/...' },
         { type: 'text', name: 'username', placeholder: 'username' },
-        { type: 'text', name: 'channel', placeholder: "#General" },
+        { type: 'text', name: 'channel', placeholder: "#general" },
         { type: 'checkbox', name: 'notify_only_broken_builds' },
       ]
@@ -99,18 +99,13 @@ class SlackService < Service
   def get_channel_field(event)
     field_name = event_channel_name(event)
-    self.send(field_name)
+    self.public_send(field_name)
   end
   def build_event_channels
-    channels = []
-
-    supported_events.each do |event|
-      channel_name = event_channel_name(event)
-      channels << { type: 'text', name: channel_name, placeholder: "#General" }
+    supported_events.reduce([]) do |channels, event|
+      channels << { type: 'text', name: event_channel_name(event), placeholder: "#general" }
     end
-
-    channels
   end
   def event_channel_name(event)

app/models/service.rb

@@ -80,6 +80,10 @@ class Service < ActiveRecord::Base
     Gitlab::PushDataBuilder.build_sample(project, user)
   end
+  def event_channel_names
+    []
+  end
+
   def supported_events
     %w(push tag_push issue merge_request wiki_page)
   end

doc/integration/slack.md

@@ -26,14 +26,13 @@ After Slack is ready we need to setup GitLab. Here are the steps to achieve this
 1.  Navigate to Settings -> Services -> Slack
-1. Pick the triggers you want to activate
+1. Pick the triggers you want to activate and respective channel(#general by default).
 1.  Fill in your Slack details
     - Webhook: Paste the Webhook URL from the step above
     - Username: Fill this in if you want to change the username of the bot
-    - Channel: Fill this in if you want to change the channel where the messages will be posted
     - Mark it as active
-    
+
 1. Save your settings
 Have fun :)

doc/project_services/project_services.md

@@ -45,7 +45,7 @@ further configuration instructions and details. Contributions are welcome.
 | PivotalTracker | Project Management Software (Source Commits Endpoint) |
 | Pushover | Pushover makes it easy to get real-time notifications on your Android device, iPhone, iPad, and Desktop |
 | [Redmine](redmine.md) | Redmine issue tracker |
-| Slack | A team communication tool for the 21st century |
+| [Slack](slack.md) | A team communication tool for the 21st century |
 ## Services Templates

doc/project_services/slack.md

+# Slack Service
+
+Go to your project's **Settings > Services > Slack** and you will see a checkbox with the following events that can be triggered:
+
+* Push
+* Issue
+* Merge request
+* Note
+* Tag push
+* Build
+* Wiki page
+
+Bellow each of these event checkboxes you will have a input to insert which Slack channel do you want to send that event message,
+#general channel is default.
+
+
+![Slack configuration](img/slack_configuration.png)
+
+
+| Field | Description |
+| ----- | ----------- |
+| `Webhook`   | The incoming webhook url which you have to setup on slack. (https://my.slack.com/services/new/incoming-webhook/) |
+| `Username`   | Optional username which can be on messages sent to slack. |
+| `notify only broken builds`    | Notify only about broken builds, when build events are marked to be sent.|
+
+