depproxy

type AllowedModule struct {
	// Exactly one of Path and PathPattern are set
	Path        goproxy.ModulePath
	PathPattern string                // if set, is a valid path.Pattern
	Version     goproxy.ModuleVersion // if not set, all versions are allowed
}

type Server struct {
	UpstreamProxy  *url.URL
	AllowedModules []AllowedModule
}