feat: add debug-goproxy option

Signed-off-by: Rintaro Okamura <[email protected]>

cmd/proxy/main.go

@@ -16,6 +16,7 @@ var (
 	serverPort               string
 	defaultAudience          string
 	tokenSourceCacheDuration string
+	debugGoproxy             bool
 )
 
 func main() {
@@ -36,6 +37,7 @@ func main() {
 	cmd.Flags().StringVar(&serverHost, "host", "0.0.0.0", "server host")
 	cmd.Flags().StringVar(&serverPort, "port", "8100", "server port")
 	cmd.Flags().StringVar(&tokenSourceCacheDuration, "token-source-cache-duration", "30m", "token source cache duration")
+	cmd.Flags().BoolVar(&debugGoproxy, "debug-goproxy", false, "verbose logging about elazarl/goproxy")
 
 	if err := cmd.Execute(); err != nil {
 		slog.Error("error occurred", "error", err)
@@ -49,6 +51,7 @@ func run(cmd *cobra.Command, args []string) error {
 		ServerPort:               serverPort,
 		DefaultAudience:          defaultAudience,
 		TokenSourceCacheDuration: tokenSourceCacheDuration,
+		DebugGoproxy:             debugGoproxy,
 	}
 
 	r, err := runner.New(cfg)

pkg/runner/proc.go

@@ -44,6 +44,7 @@ func (p *proc) Start(ctx context.Context) (_ <-chan error, err error) {
 	p.idtoken, err = idtoken.New(
 		idtoken.WithDefaultAudience(p.DefaultAudience),
 		idtoken.WithTokenSourceCacheDuration(p.TokenSourceCacheDuration),
+		idtoken.WithDebugGoproxy(p.DebugGoproxy),
 	)
 	if err != nil {
 		return nil, err

pkg/runner/runner.go

@@ -14,6 +14,7 @@ type Config struct {
 	ServerPort               string
 	DefaultAudience          string
 	TokenSourceCacheDuration string
+	DebugGoproxy             bool
 }
 
 // Runner represents main routine interface

pkg/service/google/idtoken/option.go

@@ -34,3 +34,15 @@ func (o tsCacheDurationOption) Apply(s *server) error {
 func WithTokenSourceCacheDuration(dur string) tsCacheDurationOption {
 	return tsCacheDurationOption(dur)
 }
+
+type debugGoproxyOption bool
+
+func (o debugGoproxyOption) Apply(s *server) error {
+	s.proxy.Verbose = bool(o)
+
+	return nil
+}
+
+func WithDebugGoproxy(b bool) debugGoproxyOption {
+	return debugGoproxyOption(b)
+}