Allow Member.add_user to handle access requesters

Changes include:

- Ensure Member.add_user is not called directly when not necessary
- New GroupMember.add_users_to_group to have the same abstraction level as for Project
- Refactor Member.add_user to take a source instead of an array of members
- Fix Rubocop offenses
- Always use Project#add_user instead of project.team.add_user
- Factorize users addition as members in Member.add_users_to_source
- Make access_level a keyword argument in GroupMember.add_users_to_group and ProjectMember.add_users_to_projects
- Destroy any requester before adding them as a member
- Improve the way we handle access requesters in Member.add_user
  Instead of removing the requester and creating a new member,
  we now simply accepts their access request. This way, they will
  receive a "access request granted" email.
- Fix error that was previously silently ignored
- Stop raising when access level is invalid in Member, let Rails validation do their work

Signed-off-by: Rémy Coutable <remy@rymai.me>

1 files changed, 2 insertions, 15 deletions

diff --git a/lib/api/members.rb b/lib/api/members.rb
index 37f0a6512f4..a18ce769e29 100644
--- a/lib/api/members.rb
+++ b/lib/api/members.rb
@@ -59,13 +59,6 @@ module API
           authorize_admin_source!(source_type, source)
           required_attributes! [:user_id, :access_level]
 
-          access_requester = source.requesters.find_by(user_id: params[:user_id])
-          if access_requester
-            # We pass current_user = access_requester so that the requester doesn't
-            # receive a "access denied" email
-            ::Members::DestroyService.new(access_requester, access_requester.user).execute
-          end
-
           member = source.members.find_by(user_id: params[:user_id])
 
           # This is to ensure back-compatibility but 409 behavior should be used
@@ -73,18 +66,12 @@ module API
           conflict!('Member already exists') if source_type == 'group' && member
 
           unless member
-            source.add_user(params[:user_id], params[:access_level], current_user: current_user, expires_at: params[:expires_at])
-            member = source.members.find_by(user_id: params[:user_id])
+            member = source.add_user(params[:user_id], params[:access_level], current_user: current_user, expires_at: params[:expires_at])
           end
 
-          if member
+          if member.persisted? && member.valid?
             present member.user, with: Entities::Member, member: member
           else
-            # Since `source.add_user` doesn't return a member object, we have to
-            # build a new one and populate its errors in order to render them.
-            member = source.members.build(attributes_for_keys([:user_id, :access_level, :expires_at]))
-            member.valid? # populate the errors
-
             # This is to ensure back-compatibility but 400 behavior should be used
             # for all validation errors in 9.0!
             render_api_error!('Access level is not known', 422) if member.errors.key?(:access_level)