Do not override incoming webhook channel for mattermost and slack

5 files changed, 13 insertions, 7 deletions

diff --git a/app/models/project_services/chat_notification_service.rb b/app/models/project_services/chat_notification_service.rb
index b0556987721..475344d80ce 100644
--- a/app/models/project_services/chat_notification_service.rb
+++ b/app/models/project_services/chat_notification_service.rb
@@ -49,10 +49,12 @@ class ChatNotificationService < Service
 
     return false unless message
 
-    opt = {}
+    channel_name   = get_channel_field(object_kind).presence || channel
 
-    opt[:channel]  = get_channel_field(object_kind).presence || channel || default_channel
+    opt            = {}
+    opt[:channel]  = channel_name if channel_name
     opt[:username] = username if username
+
     notifier = Slack::Notifier.new(webhook, opt)
     notifier.ping(message.pretext, attachments: message.attachments, fallback: message.fallback)
 
@@ -71,7 +73,7 @@ class ChatNotificationService < Service
     fields.reject { |field| field[:name].end_with?('channel') }
   end
 
-  def default_channel
+  def default_channel_placeholder
     raise NotImplementedError
   end
 
@@ -103,7 +105,7 @@ class ChatNotificationService < Service
 
   def build_event_channels
     supported_events.reduce([]) do |channels, event|
-      channels << { type: 'text', name: event_channel_name(event), placeholder: default_channel }
+      channels << { type: 'text', name: event_channel_name(event), placeholder: default_channel_placeholder }
     end
   end
 
diff --git a/app/models/project_services/mattermost_service.rb b/app/models/project_services/mattermost_service.rb
index 0650f930402..ee8a0b55275 100644
--- a/app/models/project_services/mattermost_service.rb
+++ b/app/models/project_services/mattermost_service.rb
@@ -35,7 +35,7 @@ class MattermostService < ChatNotificationService
     ]
   end
 
-  def default_channel
+  def default_channel_placeholder
     "#town-square"
   end
 end
diff --git a/app/models/project_services/slack_service.rb b/app/models/project_services/slack_service.rb
index 0583470d3b5..76d233a3cca 100644
--- a/app/models/project_services/slack_service.rb
+++ b/app/models/project_services/slack_service.rb
@@ -34,7 +34,7 @@ class SlackService < ChatNotificationService
     ]
   end
 
-  def default_channel
+  def default_channel_placeholder
     "#general"
   end
 end
diff --git a/changelogs/unreleased/issue_25887.yml b/changelogs/unreleased/issue_25887.yml
new file mode 100644
index 00000000000..27299bbc5f9
--- /dev/null
+++ b/changelogs/unreleased/issue_25887.yml
@@ -0,0 +1,4 @@
+---
+title: Do not override incoming webhook for mattermost and slack
+merge_request:
+author:
diff --git a/spec/support/slack_mattermost_notifications_shared_examples.rb b/spec/support/slack_mattermost_notifications_shared_examples.rb
index 8582aea5fe5..74d9b8c6313 100644
--- a/spec/support/slack_mattermost_notifications_shared_examples.rb
+++ b/spec/support/slack_mattermost_notifications_shared_examples.rb
@@ -105,7 +105,7 @@ RSpec.shared_examples 'slack or mattermost notifications' do
       allow(chat_service).to receive(:username).and_return(username)
 
       expect(Slack::Notifier).to receive(:new).
-       with(webhook_url, username: username, channel: chat_service.default_channel).
+       with(webhook_url, username: username).
        and_return(
          double(:slack_service).as_null_object
        )