Send notification emails when push to a merge requestYarNayar/gitlab-ce-23460-send-email-when-pushing-more-commits-to-the-merge-request

Closes #23460

8 files changed, 81 insertions, 8 deletions

diff --git a/app/mailers/emails/merge_requests.rb b/app/mailers/emails/merge_requests.rb
index 5fe09cea83f..be99f3780cc 100644
--- a/app/mailers/emails/merge_requests.rb
+++ b/app/mailers/emails/merge_requests.rb
@@ -11,6 +11,14 @@ module Emails
       mail_answer_thread(@merge_request, merge_request_thread_options(updated_by_user_id, recipient_id, reason))
     end
 
+    def push_to_merge_request_email(recipient_id, merge_request_id, updated_by_user_id, reason = nil, new_commits: [], existing_commits: [])
+      setup_merge_request_mail(merge_request_id, recipient_id)
+      @new_commits = new_commits
+      @existing_commits = existing_commits
+
+      mail_answer_thread(@merge_request, merge_request_thread_options(updated_by_user_id, recipient_id, reason))
+    end
+
     def reassigned_merge_request_email(recipient_id, merge_request_id, previous_assignee_id, updated_by_user_id, reason = nil)
       setup_merge_request_mail(merge_request_id, recipient_id)
 
diff --git a/app/models/commit.rb b/app/models/commit.rb
index cceae5efb72..b64462fb768 100644
--- a/app/models/commit.rb
+++ b/app/models/commit.rb
@@ -175,7 +175,7 @@ class Commit
       if safe_message.blank?
         no_commit_message
       else
-        safe_message.split("\n", 2).first
+        safe_message.split(/[\r\n]/, 2).first
       end
   end
 
diff --git a/app/models/notification_recipient.rb b/app/models/notification_recipient.rb
index e95655e19f8..b3ffad00a07 100644
--- a/app/models/notification_recipient.rb
+++ b/app/models/notification_recipient.rb
@@ -48,7 +48,7 @@ class NotificationRecipient
     when :custom
       custom_enabled? || %i[participating mention].include?(@type)
     when :watch, :participating
-      !excluded_watcher_action?
+      !action_excluded?
     when :mention
       @type == :mention
     else
@@ -96,13 +96,22 @@ class NotificationRecipient
     end
   end
 
+  def action_excluded?
+    excluded_watcher_action? || excluded_participating_action?
+  end
+
   def excluded_watcher_action?
-    return false unless @custom_action
-    return false if notification_level == :custom
+    return false unless @custom_action && notification_level == :watch
 
     NotificationSetting::EXCLUDED_WATCHER_EVENTS.include?(@custom_action)
   end
 
+  def excluded_participating_action?
+    return false unless @custom_action && notification_level == :participating
+
+    NotificationSetting::EXCLUDED_PARTICIPATING_EVENTS.include?(@custom_action)
+  end
+
   private
 
   def read_ability
diff --git a/app/models/notification_setting.rb b/app/models/notification_setting.rb
index 245f8dddcf9..f6d9b0215fc 100644
--- a/app/models/notification_setting.rb
+++ b/app/models/notification_setting.rb
@@ -33,6 +33,7 @@ class NotificationSetting < ActiveRecord::Base
     :close_issue,
     :reassign_issue,
     :new_merge_request,
+    :push_to_merge_request,
     :reopen_merge_request,
     :close_merge_request,
     :reassign_merge_request,
@@ -41,10 +42,14 @@ class NotificationSetting < ActiveRecord::Base
     :success_pipeline
   ].freeze
 
-  EXCLUDED_WATCHER_EVENTS = [
+  EXCLUDED_PARTICIPATING_EVENTS = [
     :success_pipeline
   ].freeze
 
+  EXCLUDED_WATCHER_EVENTS = [
+    :push_to_merge_request
+  ].push(*EXCLUDED_PARTICIPATING_EVENTS).freeze
+
   def self.find_or_create_for(source)
     setting = find_or_initialize_by(source: source)
 
diff --git a/app/services/merge_requests/refresh_service.rb b/app/services/merge_requests/refresh_service.rb
index 18c40ce8992..1fb1796b56c 100644
--- a/app/services/merge_requests/refresh_service.rb
+++ b/app/services/merge_requests/refresh_service.rb
@@ -21,7 +21,7 @@ module MergeRequests
         comment_mr_branch_presence_changed
       end
 
-      comment_mr_with_commits
+      notify_about_push
       mark_mr_as_wip_from_commits
       execute_mr_web_hooks
 
@@ -141,8 +141,8 @@ module MergeRequests
       end
     end
 
-    # Add comment about pushing new commits to merge requests
-    def comment_mr_with_commits
+    # Add comment about pushing new commits to merge requests and send nofitication emails
+    def notify_about_push
       return unless @commits.present?
 
       merge_requests_for_source_branch.each do |merge_request|
@@ -155,6 +155,8 @@ module MergeRequests
         SystemNoteService.add_commits(merge_request, merge_request.project,
                                       @current_user, new_commits,
                                       existing_commits, @oldrev)
+
+        notification_service.push_to_merge_request(merge_request, @current_user, new_commits: new_commits, existing_commits: existing_commits)
       end
     end
 
diff --git a/app/services/notification_service.rb b/app/services/notification_service.rb
index d7d2cde1004..f94c76cf3ac 100644
--- a/app/services/notification_service.rb
+++ b/app/services/notification_service.rb
@@ -113,6 +113,16 @@ class NotificationService
     new_resource_email(merge_request, :new_merge_request_email)
   end
 
+  def push_to_merge_request(merge_request, current_user, new_commits: [], existing_commits: [])
+    new_commits = new_commits.map { |c| { short_id: c.short_id, title: c.title } }
+    existing_commits = existing_commits.map { |c| { short_id: c.short_id, title: c.title } }
+    recipients = NotificationRecipientService.build_recipients(merge_request, current_user, action: "push_to")
+
+    recipients.each do |recipient|
+      mailer.send(:push_to_merge_request_email, recipient.user.id, merge_request.id, current_user.id, recipient.reason, new_commits: new_commits, existing_commits: existing_commits).deliver_later
+    end
+  end
+
   # When merge request text is updated, we should send an email to:
   #
   #  * newly mentioned project team members with notification level higher than Participating
diff --git a/app/views/notify/push_to_merge_request_email.html.haml b/app/views/notify/push_to_merge_request_email.html.haml
new file mode 100644
index 00000000000..5cc6f21c0f3
--- /dev/null
+++ b/app/views/notify/push_to_merge_request_email.html.haml
@@ -0,0 +1,26 @@
+%h3
+  New commits were pushed to the merge request
+  = link_to(@merge_request.to_reference, project_merge_request_url(@merge_request.target_project, @merge_request))
+  by #{@current_user.name}
+
+- if @existing_commits.any?
+  - count = @existing_commits.size
+  %ul
+    %li
+      - if count.one?
+        - commit_id = @existing_commits.first[:short_id]
+        = link_to(commit_id, project_commit_url(@merge_request.target_project, commit_id))
+      - else
+        = link_to(project_compare_url(@merge_request.target_project, from: @existing_commits.first[:short_id], to: @existing_commits.last[:short_id])) do
+          #{@existing_commits.first[:short_id]}...#{@existing_commits.last[:short_id]}
+      = precede '&nbsp;- ' do
+        - commits_text = "#{count} commit".pluralize(count)
+        #{commits_text} from branch `#{@merge_request.target_branch}`
+
+- if @new_commits.any?
+  %ul
+    - @new_commits.each do |commit|
+      %li
+        = link_to(commit[:short_id], project_commit_url(@merge_request.target_project, commit[:short_id]))
+        = precede ' - ' do
+          #{commit[:title]}
diff --git a/app/views/notify/push_to_merge_request_email.text.haml b/app/views/notify/push_to_merge_request_email.text.haml
new file mode 100644
index 00000000000..d7722e5f41f
--- /dev/null
+++ b/app/views/notify/push_to_merge_request_email.text.haml
@@ -0,0 +1,13 @@
+New commits were pushed to the merge request #{@merge_request.to_reference} by #{@current_user.name}
+\
+#{url_for(project_merge_request_url(@merge_request.target_project, @merge_request))}
+\
+- if @existing_commits.any?
+  - count = @existing_commits.size
+  - commits_id = count.one? ? @existing_commits.first[:short_id] : "#{@existing_commits.first[:short_id]}...#{@existing_commits.last[:short_id]}"
+  - commits_text = "#{count} commit".pluralize(count)
+
+  * #{commits_id} - #{commits_text} from branch `#{@merge_request.target_branch}`
+\
+- @new_commits.each do |commit|
+  * #{commit[:short_id]} - #{raw commit[:title]}