Support new chat notifications parameters in Services API

+ Add support for the new separate channel and events settings
* Dry up chat notifications in the service properties definitions

changelogs/unreleased/32364-updating-slack-notification-not-working-by-api.yml

+---
+title: Support new chat notifications parameters in Services API
+merge_request: 11435
+author:
+type: added

doc/api/services.md

@@ -803,11 +803,33 @@ Set Slack service for a project.
 PUT /projects/:id/services/slack
 ```
 
-Parameters:
+>**Note:** Specific event parameters (e.g. `push_events` flag and `push_channel`) were [introduced in v10.4][11435]
+
+#### Parameters
 
-- `webhook` (**required**) - https://hooks.slack.com/services/...
-- `username` (optional) - username
-- `channel` (optional) - #channel
+| Parameter | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `webhook` | string | true | https://hooks.slack.com/services/... |
+| `username` | string | false | username |
+| `channel` | string | false | Default channel to use if others are not configured |
+| `notify_only_broken_pipelines` | boolean | false | Send notifications for broken pipelines |
+| `notify_only_default_branch` | boolean | false | Send notifications only for the default branch |
+| `push_events` | boolean | false | Enable notifications for push events |
+| `issues_events` | boolean | false | Enable notifications for issue events |
+| `confidential_issues_events` | boolean | false | Enable notifications for confidential issue events |
+| `merge_requests_events` | boolean | false | Enable notifications for merge request events |
+| `tag_push_events` | boolean | false | Enable notifications for tag push events |
+| `note_events` | boolean | false | Enable notifications for note events |
+| `pipeline_events` | boolean | false | Enable notifications for pipeline events |
+| `wiki_page_events` | boolean | false | Enable notifications for wiki page events |
+| `push_channel` | string | false | The name of the channel to receive push events notifications |
+| `issue_channel` | string | false | The name of the channel to receive issues events notifications |
+| `confidential_issue_channel` | string | false | The name of the channel to receive confidential issues events notifications |
+| `merge_request_channel` | string | false | The name of the channel to receive merge request events notifications |
+| `note_channel` | string | false | The name of the channel to receive note events notifications |
+| `tag_push_channel` | string | false | The name of the channel to receive tag push events notifications |
+| `pipeline_channel` | string | false | The name of the channel to receive pipeline events notifications |
+| `wiki_page_channel` | string | false | The name of the channel to receive wiki page events notifications |
 
 ### Delete Slack service
 
@@ -837,11 +859,33 @@ Set Mattermost service for a project.
 PUT /projects/:id/services/mattermost
 ```
 
-Parameters:
+>**Note:** Specific event parameters (e.g. `push_events` flag and `push_channel`) were [introduced in v10.4][11435]
 
-- `webhook` (**required**) - https://mattermost.example/hooks/1298aff...
-- `username` (optional) - username
-- `channel` (optional) - #channel
+#### Parameters
+
+| Parameter | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `webhook` | string | true | The Mattermost webhook. e.g. http://mattermost_host/hooks/... |
+| `username` | string | false | username |
+| `channel` | string | false | Default channel to use if others are not configured |
+| `notify_only_broken_pipelines` | boolean | false | Send notifications for broken pipelines |
+| `notify_only_default_branch` | boolean | false | Send notifications only for the default branch |
+| `push_events` | boolean | false | Enable notifications for push events |
+| `issues_events` | boolean | false | Enable notifications for issue events |
+| `confidential_issues_events` | boolean | false | Enable notifications for confidential issue events |
+| `merge_requests_events` | boolean | false | Enable notifications for merge request events |
+| `tag_push_events` | boolean | false | Enable notifications for tag push events |
+| `note_events` | boolean | false | Enable notifications for note events |
+| `pipeline_events` | boolean | false | Enable notifications for pipeline events |
+| `wiki_page_events` | boolean | false | Enable notifications for wiki page events |
+| `push_channel` | string | false | The name of the channel to receive push events notifications |
+| `issue_channel` | string | false | The name of the channel to receive issues events notifications |
+| `confidential_issue_channel` | string | false | The name of the channel to receive confidential issues events notifications |
+| `merge_request_channel` | string | false | The name of the channel to receive merge request events notifications |
+| `note_channel` | string | false | The name of the channel to receive note events notifications |
+| `tag_push_channel` | string | false | The name of the channel to receive tag push events notifications |
+| `pipeline_channel` | string | false | The name of the channel to receive pipeline events notifications |
+| `wiki_page_channel` | string | false | The name of the channel to receive wiki page events notifications |
 
 ### Delete Mattermost notifications service
 
@@ -933,3 +977,5 @@ Get MockCI service settings for a project.
 ```
 GET /projects/:id/services/mock-ci
 ```
+
+[11435]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11435

lib/api/entities.rb

@@ -708,8 +708,9 @@ module API
 
     class ProjectService < Grape::Entity
       expose :id, :title, :created_at, :updated_at, :active
-      expose :push_events, :issues_events, :merge_requests_events
-      expose :tag_push_events, :note_events, :pipeline_events
+      expose :push_events, :issues_events, :confidential_issues_events
+      expose :merge_requests_events, :tag_push_events, :note_events
+      expose :pipeline_events, :wiki_page_events
       expose :job_events
       # Expose serialized properties
       expose :properties do |service, options|

lib/api/services.rb

 module API
   class Services < Grape::API
+    chat_notification_settings = [
+      {
+        required: true,
+        name: :webhook,
+        type: String,
+        desc: 'The chat webhook'
+      },
+      {
+        required: false,
+        name: :username,
+        type: String,
+        desc: 'The chat username'
+      },
+      {
+        required: false,
+        name: :channel,
+        type: String,
+        desc: 'The default chat channel'
+      }
+    ]
+
+    chat_notification_flags = [
+      {
+        required: false,
+        name: :notify_only_broken_pipelines,
+        type: Boolean,
+        desc: 'Send notifications for broken pipelines'
+      },
+      {
+        required: false,
+        name: :notify_only_default_branch,
+        type: Boolean,
+        desc: 'Send notifications only for the default branch'
+      }
+    ]
+
+    chat_notification_channels = [
+      {
+        required: false,
+        name: :push_channel,
+        type: String,
+        desc: 'The name of the channel to receive push_events notifications'
+      },
+      {
+        required: false,
+        name: :issue_channel,
+        type: String,
+        desc: 'The name of the channel to receive issues_events notifications'
+      },
+      {
+        required: false,
+        name: :confidential_issue_channel,
+        type: String,
+        desc: 'The name of the channel to receive confidential_issues_events notifications'
+      },
+      {
+        required: false,
+        name: :merge_request_channel,
+        type: String,
+        desc: 'The name of the channel to receive merge_requests_events notifications'
+      },
+      {
+        required: false,
+        name: :note_channel,
+        type: String,
+        desc: 'The name of the channel to receive note_events notifications'
+      },
+      {
+        required: false,
+        name: :tag_push_channel,
+        type: String,
+        desc: 'The name of the channel to receive tag_push_events notifications'
+      },
+      {
+        required: false,
+        name: :pipeline_channel,
+        type: String,
+        desc: 'The name of the channel to receive pipeline_events notifications'
+      },
+      {
+        required: false,
+        name: :wiki_page_channel,
+        type: String,
+        desc: 'The name of the channel to receive wiki_page_events notifications'
+      }
+    ]
+
+    chat_notification_events = [
+      {
+        required: false,
+        name: :push_events,
+        type: Boolean,
+        desc: 'Enable notifications for push_events'
+      },
+      {
+        required: false,
+        name: :issues_events,
+        type: Boolean,
+        desc: 'Enable notifications for issues_events'
+      },
+      {
+        required: false,
+        name: :confidential_issues_events,
+        type: Boolean,
+        desc: 'Enable notifications for confidential_issues_events'
+      },
+      {
+        required: false,
+        name: :merge_requests_events,
+        type: Boolean,
+        desc: 'Enable notifications for merge_requests_events'
+      },
+      {
+        required: false,
+        name: :note_events,
+        type: Boolean,
+        desc: 'Enable notifications for note_events'
+      },
+      {
+        required: false,
+        name: :tag_push_events,
+        type: Boolean,
+        desc: 'Enable notifications for tag_push_events'
+      },
+      {
+        required: false,
+        name: :pipeline_events,
+        type: Boolean,
+        desc: 'Enable notifications for pipeline_events'
+      },
+      {
+        required: false,
+        name: :wiki_page_events,
+        type: Boolean,
+        desc: 'Enable notifications for wiki_page_events'
+      }
+    ]
+
     services = {
       'asana' => [
         {
@@ -489,25 +627,11 @@ module API
         }
       ],
       'slack' => [
-        {
-          required: true,
-          name: :webhook,
-          type: String,
-          desc: 'The Slack webhook. e.g. https://hooks.slack.com/services/...'
-        },
-        {
-          required: false,
-          name: :new_issue_url,
-          type: String,
-          desc: 'The user name'
-        },
-        {
-          required: false,
-          name: :channel,
-          type: String,
-          desc: 'The channel name'
-        }
-      ],
+        chat_notification_settings,
+        chat_notification_flags,
+        chat_notification_channels,
+        chat_notification_events
+      ].flatten,
       'microsoft-teams' => [
         {
           required: true,
@@ -517,19 +641,11 @@ module API
         }
       ],
       'mattermost' => [
-        {
-          required: true,
-          name: :webhook,
-          type: String,
-          desc: 'The Mattermost webhook. e.g. http://mattermost_host/hooks/...'
-        },
-        {
-          required: false,
-          name: :username,
-          type: String,
-          desc: 'The username to use to post the message'
-        }
-      ],
+        chat_notification_settings,
+        chat_notification_flags,
+        chat_notification_channels,
+        chat_notification_events
+      ].flatten,
       'teamcity' => [
         {
           required: true,