Improve Members::DestroyService

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

8 files changed, 131 insertions, 74 deletions

diff --git a/app/controllers/concerns/membership_actions.rb b/app/controllers/concerns/membership_actions.rb
index 634a10dc357..5617113e10c 100644
--- a/app/controllers/concerns/membership_actions.rb
+++ b/app/controllers/concerns/membership_actions.rb
@@ -15,18 +15,16 @@ module MembershipActions
   end
 
   def leave
-    @member = membershipable.members.find_by(user_id: current_user) ||
-      membershipable.requesters.find_by(user_id: current_user)
-    Members::DestroyService.new(@member, current_user).execute
+    Members::DestroyService.new(membershipable, current_user, user_id: current_user.id).execute(:all)
 
-    source_type = @member.real_source_type.humanize(capitalize: false)
+    source_type = membershipable.class.to_s.humanize(capitalize: false)
     notice =
       if @member.request?
         "Your access request to the #{source_type} has been withdrawn."
       else
-        "You left the \"#{@member.source.human_name}\" #{source_type}."
+        "You left the \"#{membershipable.human_name}\" #{source_type}."
       end
-    redirect_path = @member.request? ? @member.source : [:dashboard, @member.real_source_type.tableize]
+    redirect_path = @member.request? ? @member.source : [:dashboard, membershipable.class.to_s.tableize]
 
     redirect_to redirect_path, notice: notice
   end
diff --git a/app/controllers/groups/group_members_controller.rb b/app/controllers/groups/group_members_controller.rb
index 272164cd0cc..0047fcec2ab 100644
--- a/app/controllers/groups/group_members_controller.rb
+++ b/app/controllers/groups/group_members_controller.rb
@@ -40,10 +40,7 @@ class Groups::GroupMembersController < Groups::ApplicationController
   end
 
   def destroy
-    @group_member = @group.members.find_by(id: params[:id]) ||
-      @group.requesters.find_by(id: params[:id])
-
-    Members::DestroyService.new(@group_member, current_user).execute
+    Members::DestroyService.new(@group, current_user, user_id: params[:id]).execute(:all)
 
     respond_to do |format|
       format.html { redirect_to group_group_members_path(@group), notice: 'User was successfully removed from group.' }
diff --git a/app/controllers/projects/project_members_controller.rb b/app/controllers/projects/project_members_controller.rb
index 42a7e5a2c30..c9786840f57 100644
--- a/app/controllers/projects/project_members_controller.rb
+++ b/app/controllers/projects/project_members_controller.rb
@@ -55,10 +55,7 @@ class Projects::ProjectMembersController < Projects::ApplicationController
   end
 
   def destroy
-    @project_member = @project.members.find_by(id: params[:id]) ||
-      @project.requesters.find_by(id: params[:id])
-
-    Members::DestroyService.new(@project_member, current_user).execute
+    Members::DestroyService.new(@project, current_user, user_id: params[:id]).execute(:all)
 
     respond_to do |format|
       format.html do
diff --git a/app/services/members/destroy_service.rb b/app/services/members/destroy_service.rb
index 9a2bf82ef51..b3d79d577bd 100644
--- a/app/services/members/destroy_service.rb
+++ b/app/services/members/destroy_service.rb
@@ -1,17 +1,41 @@
 module Members
   class DestroyService < BaseService
-    attr_accessor :member, :current_user
+    include MembersHelper
 
-    def initialize(member, current_user)
-      @member = member
+    attr_accessor :source
+
+    ALLOWED_SCOPES = %i[members requesters all]
+
+    def initialize(source, current_user, params = {})
+      @source = source
       @current_user = current_user
+      @params = params
     end
 
-    def execute
-      unless member && can?(current_user, "destroy_#{member.type.underscore}".to_sym, member)
-        raise Gitlab::Access::AccessDeniedError
-      end
+    def execute(scope = :members)
+      raise "scope :#{scope} is not allowed!" unless ALLOWED_SCOPES.include?(scope)
+
+      member = find_member(scope)
+
+      raise Gitlab::Access::AccessDeniedError if cannot_destroy_member?(member)
+
       AuthorizedDestroyService.new(member, current_user).execute
     end
+
+    private
+
+    def find_member(scope)
+      case scope
+      when :all
+        source.members.find_by(user_id: params[:user_id]) ||
+          source.requesters.find_by!(user_id: params[:user_id])
+      else
+        source.public_send(scope).find_by!(user_id: params[:user_id])
+      end
+    end
+
+    def cannot_destroy_member?(member)
+      !member || !can?(current_user, action_member_permission(:destroy, member), member)
+    end
   end
 end
diff --git a/lib/api/access_requests.rb b/lib/api/access_requests.rb
index b5974429c50..60f90959b9a 100644
--- a/lib/api/access_requests.rb
+++ b/lib/api/access_requests.rb
@@ -75,9 +75,7 @@ module API
           required_attributes! [:user_id]
           source = find_source(source_type, params[:id])
 
-          access_requester = source.requesters.find_by!(user_id: params[:user_id])
-
-          ::Members::DestroyService.new(access_requester, current_user).execute
+          ::Members::DestroyService.new(source, current_user, declared(params)).execute(:requesters)
         end
       end
     end
diff --git a/lib/api/members.rb b/lib/api/members.rb
index 94c16710d9a..4cc80f09a9b 100644
--- a/lib/api/members.rb
+++ b/lib/api/members.rb
@@ -59,19 +59,20 @@ 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
           # for both project and group members in 9.0!
           conflict!('Member already exists') if source_type == 'group' && member
 
+          access_requester = source.requesters.find_by(user_id: params[:user_id])
+          if access_requester
+            # We delete a potential access requester before creating the new member.
+            # We pass current_user = access_requester so that the requester doesn't
+            # receive a "access denied" email.
+            ::Members::DestroyService.new(source, access_requester.user, params).execute(:requesters)
+          end
+
           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])
@@ -147,7 +148,7 @@ module API
           if member.nil?
             { message: "Access revoked", id: params[:user_id].to_i }
           else
-            ::Members::DestroyService.new(member, current_user).execute
+            ::Members::DestroyService.new(source, current_user, params).execute
 
             present member.user, with: Entities::Member, member: member
           end
diff --git a/spec/requests/api/access_requests_spec.rb b/spec/requests/api/access_requests_spec.rb
index 905a7311372..b7e5c2af82a 100644
--- a/spec/requests/api/access_requests_spec.rb
+++ b/spec/requests/api/access_requests_spec.rb
@@ -195,7 +195,7 @@ describe API::AccessRequests, api: true  do
       end
 
       context 'when authenticated as the access requester' do
-        it 'returns 200' do
+        it 'deletes the access requester' do
           expect do
             delete api("/#{source_type.pluralize}/#{source.id}/access_requests/#{access_requester.id}", access_requester)
 
@@ -205,7 +205,7 @@ describe API::AccessRequests, api: true  do
       end
 
       context 'when authenticated as a master/owner' do
-        it 'returns 200' do
+        it 'deletes the access requester' do
           expect do
             delete api("/#{source_type.pluralize}/#{source.id}/access_requests/#{access_requester.id}", master)
 
@@ -213,6 +213,16 @@ describe API::AccessRequests, api: true  do
           end.to change { source.requesters.count }.by(-1)
         end
 
+        context 'user_id matches a member' do
+          it 'returns 404' do
+            expect do
+              delete api("/#{source_type.pluralize}/#{source.id}/access_requests/#{developer.id}", master)
+
+              expect(response).to have_http_status(404)
+            end.not_to change { source.requesters.count }
+          end
+        end
+
         context 'user_id does not match an existing access requester' do
           it 'returns 404' do
             expect do
diff --git a/spec/services/members/destroy_service_spec.rb b/spec/services/members/destroy_service_spec.rb
index 2395445e7fd..06a6b0083c9 100644
--- a/spec/services/members/destroy_service_spec.rb
+++ b/spec/services/members/destroy_service_spec.rb
@@ -2,70 +2,102 @@ require 'spec_helper'
 
 describe Members::DestroyService, services: true do
   let(:user) { create(:user) }
-  let(:project) { create(:project) }
-  let!(:member) { create(:project_member, source: project) }
+  let(:member_user) { create(:user) }
+  let(:project) { create(:project, :public) }
+  let(:group) { create(:group, :public) }
 
-  context 'when member is nil' do
-    before do
-      project.team << [user, :developer]
+  shared_examples 'a service raising ActiveRecord::RecordNotFound' do
+    it 'raises ActiveRecord::RecordNotFound' do
+      expect { described_class.new(source, user, params).execute }.to raise_error(ActiveRecord::RecordNotFound)
     end
+  end
 
-    it 'does not destroy the member' do
-      expect { destroy_member(nil, user) }.to raise_error(Gitlab::Access::AccessDeniedError)
+  shared_examples 'a service raising Gitlab::Access::AccessDeniedError' do
+    it 'raises Gitlab::Access::AccessDeniedError' do
+      expect { described_class.new(source, user, params).execute }.to raise_error(Gitlab::Access::AccessDeniedError)
     end
   end
 
-  context 'when current user cannot destroy the given member' do
-    before do
-      project.team << [user, :developer]
+  shared_examples 'a service destroying a member' do
+    it 'destroys the member' do
+      expect { described_class.new(source, user, params).execute }.to change { source.members.count }.by(-1)
     end
 
-    it 'does not destroy the member' do
-      expect { destroy_member(member, user) }.to raise_error(Gitlab::Access::AccessDeniedError)
+    context 'when the given member is an access requester' do
+      before do
+        source.members.find_by(user_id: member_user).destroy
+        source.request_access(member_user)
+      end
+      let(:access_requester) { source.requesters.find_by(user_id: member_user) }
+
+      it_behaves_like 'a service raising ActiveRecord::RecordNotFound'
+
+      %i[requesters all].each do |scope|
+        context "and #{scope} scope is passed" do
+          it 'destroys the access requester' do
+            expect { described_class.new(source, user, params).execute(scope) }.to change { source.requesters.count }.by(-1)
+          end
+
+          it 'calls Member#after_decline_request' do
+            expect_any_instance_of(NotificationService).to receive(:decline_access_request).with(access_requester)
+
+            described_class.new(source, user, params).execute(scope)
+          end
+
+          context 'when current user is the member' do
+            it 'does not call Member#after_decline_request' do
+              expect_any_instance_of(NotificationService).not_to receive(:decline_access_request).with(access_requester)
+
+              described_class.new(source, member_user, params).execute(scope)
+            end
+          end
+        end
+      end
     end
   end
 
-  context 'when current user can destroy the given member' do
-    before do
-      project.team << [user, :master]
+  context 'when no member are found' do
+    let(:params) { { user_id: 42 } }
+
+    it_behaves_like 'a service raising ActiveRecord::RecordNotFound' do
+      let(:source) { project }
     end
 
-    it 'destroys the member' do
-      destroy_member(member, user)
+    it_behaves_like 'a service raising ActiveRecord::RecordNotFound' do
+      let(:source) { group }
+    end
+  end
 
-      expect(member).to be_destroyed
+  context 'when a member is found' do
+    before do
+      project.team << [member_user, :developer]
+      group.add_developer(member_user)
     end
+    let(:params) { { user_id: member_user.id } }
 
-    context 'when the given member is a requester' do
-      before do
-        member.update_column(:requested_at, Time.now)
+    context 'when current user cannot destroy the given member' do
+      it_behaves_like 'a service raising Gitlab::Access::AccessDeniedError' do
+        let(:source) { project }
       end
 
-      it 'calls Member#after_decline_request' do
-        expect_any_instance_of(NotificationService).to receive(:decline_access_request).with(member)
-
-        destroy_member(member, user)
+      it_behaves_like 'a service raising Gitlab::Access::AccessDeniedError' do
+        let(:source) { group }
       end
+    end
 
-      context 'when current user is the member' do
-        it 'does not call Member#after_decline_request' do
-          expect_any_instance_of(NotificationService).not_to receive(:decline_access_request).with(member)
-
-          destroy_member(member, member.user)
-        end
+    context 'when current user can destroy the given member' do
+      before do
+        project.team << [user, :master]
+        group.add_owner(user)
       end
 
-      context 'when current user is the member and ' do
-        it 'does not call Member#after_decline_request' do
-          expect_any_instance_of(NotificationService).not_to receive(:decline_access_request).with(member)
+      it_behaves_like 'a service destroying a member' do
+        let(:source) { project }
+      end
 
-          destroy_member(member, member.user)
-        end
+      it_behaves_like 'a service destroying a member' do
+        let(:source) { group }
       end
     end
   end
-
-  def destroy_member(member, user)
-    Members::DestroyService.new(member, user).execute
-  end
 end