Validate with Git Hooks before accepting a merge request

app/controllers/projects/merge_requests_controller.rb

@@ -197,6 +197,12 @@ class Projects::MergeRequestsController < Projects::ApplicationController
       return
     end
 
+    merge_request_service = MergeRequests::MergeService.new(@project, current_user, merge_params)
+    unless merge_request_service.hooks_validation_pass?(@merge_request)
+      @status = :failed
+      return
+    end
+
     TodoService.new.merge_merge_request(merge_request, current_user)
 
     @merge_request.update(merge_error: nil)

app/services/merge_requests/merge_service.rb

@@ -28,6 +28,22 @@ module MergeRequests
       end
     end
 
+    def hooks_validation_pass?(merge_request)
+      git_hook = merge_request.project.git_hook
+
+      unless git_hook.commit_message_allowed?(params[:commit_message])
+        merge_request.update(merge_error: "Commit message does not follow the pattern '#{git_hook.commit_message_regex}'")
+        return false
+      end
+
+      unless git_hook.author_email_allowed?(current_user.email)
+        merge_request.update(merge_error: "Commit author's email '#{current_user.email}' does not follow the pattern '#{git_hook.author_email_regex}'")
+        return false
+      end
+
+      true
+    end
+
     private
 
     def commit