Dont allow guests..developers to manage group members

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

lib/api/group_members.rb

@@ -39,14 +39,18 @@ module API
       # Example Request:
       #  POST /groups/:id/members
       post ":id/members" do
+        group = find_group(params[:id])
+        authorize! :manage_group, group
         required_attributes! [:user_id, :access_level]
+
         unless validate_access_level?(params[:access_level])
           render_api_error!("Wrong access level", 422)
         end
-        group = find_group(params[:id])
+
         if group.group_members.find_by(user_id: params[:user_id])
           render_api_error!("Already exists", 409)
         end
+
         group.add_users([params[:user_id]], params[:access_level])
         member = group.group_members.find_by(user_id: params[:user_id])
         present member.user, with: Entities::GroupMember, group: group
@@ -62,7 +66,9 @@ module API
       #   DELETE /groups/:id/members/:user_id
       delete ":id/members/:user_id" do
         group = find_group(params[:id])
+        authorize! :manage_group, group
         member = group.group_members.find_by(user_id: params[:user_id])
+
         if member.nil?
           render_api_error!("404 Not Found - user_id:#{params[:user_id]} not a member of group #{group.name}",404)
         else

spec/requests/api/group_members_spec.rb

@@ -115,16 +115,22 @@ describe API::API, api: true  do
 
     context "when a member of the group" do
       it "should delete guest's membership of group" do
-        count_before=group_with_members.group_members.count
+        expect {
           delete api("/groups/#{group_with_members.id}/members/#{guest.id}", owner)
+        }.to change { group_with_members.members.count }.by(-1)
+
         response.status.should == 200
-        group_with_members.group_members.count.should == count_before - 1
       end
 
       it "should return a 404 error when user id is not known" do
         delete api("/groups/#{group_with_members.id}/members/1328", owner)
         response.status.should == 404
       end
+
+      it "should not allow guest to modify group members" do
+        delete api("/groups/#{group_with_members.id}/members/#{master.id}", guest)
+        response.status.should == 403
+      end
     end
   end
 end