protected override void PopulateAttributes()

in src/Google.Cloud.Functions.Framework/GcfEvents/GcfConverters.cs [432:461]

• 28 lines of code
• 5 McCabe index (conditional complexity)

            protected override void PopulateAttributes(Request request, CloudEvent evt)
            {
                string resource = request.Context.Resource.Name!;
                string service = request.Context.Resource.Service!;

                string? domain = request.Domain;
                if (string.IsNullOrEmpty(domain))
                {
                    throw new ConversionException("Firebase RTDB event does not contain a domain");
                }
                string location = domain == FirebaseDefaultDomain
                    ? FirebaseDefaultLocation
                    : domain.Split('.').First();

                string[] resourceSegments = resource.Split('/', SubjectStartIndex + 1);
                if (resourceSegments.Length < SubjectStartIndex ||
                    !resourceSegments[SubjectStartIndex].StartsWith(ExpectedSubjectPrefix, StringComparison.Ordinal))
                {
                    // This is odd... just put everything in the source as normal.
                    base.PopulateAttributes(request, evt);
                }
                else
                {
                    // We need to convert "projects/_/instances/{instance}" to "projects/_/locations/{location}/instances/{instance}".
                    string sourcePath = string.Join('/',
                        resourceSegments.Take(2).Concat(new[] { "locations", location }).Concat(resourceSegments.Skip(2).Take(2)));
                    evt.Subject = resourceSegments[SubjectStartIndex];
                    evt.Source = FormatSource(service, sourcePath);
                }
            }