Fixed: #499 #985

feat(oauth): add support for customizable OAuth callback ports

- Introduced `oauth-callback-port` flag to override default callback ports.
- Updated SDK and login flows for `iflow`, `gemini`, `antigravity`, `codex`, `claude`, and `openai` to respect configurable callback ports.
- Refactored internal OAuth servers to dynamically assign ports based on the provided options.
- Revised tests and documentation to reflect the new flag and behavior.

cmd/server/main.go

@@ -61,6 +61,7 @@ func main() {
 	var iflowLogin bool
 	var iflowCookie bool
 	var noBrowser bool
+	var oauthCallbackPort int
 	var antigravityLogin bool
 	var projectID string
 	var vertexImport string
@@ -75,6 +76,7 @@ func main() {
 	flag.BoolVar(&iflowLogin, "iflow-login", false, "Login to iFlow using OAuth")
 	flag.BoolVar(&iflowCookie, "iflow-cookie", false, "Login to iFlow using Cookie")
 	flag.BoolVar(&noBrowser, "no-browser", false, "Don't open browser automatically for OAuth")
+	flag.IntVar(&oauthCallbackPort, "oauth-callback-port", 0, "Override OAuth callback port (defaults to provider-specific port)")
 	flag.BoolVar(&antigravityLogin, "antigravity-login", false, "Login to Antigravity using OAuth")
 	flag.StringVar(&projectID, "project_id", "", "Project ID (Gemini only, not required)")
 	flag.StringVar(&configPath, "config", DefaultConfigPath, "Configure File Path")
@@ -425,7 +427,8 @@ func main() {
 
 	// Create login options to be used in authentication flows.
 	options := &cmd.LoginOptions{
-		NoBrowser: noBrowser,
+		NoBrowser:    noBrowser,
+		CallbackPort: oauthCallbackPort,
 	}
 
 	// Register the shared token store once so all components use the same persistence backend.

internal/auth/gemini/gemini_auth.go

@@ -29,8 +29,9 @@ import (
 )
 
 const (
-	geminiOauthClientID     = "681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com"
-	geminiOauthClientSecret = "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"
+	geminiOauthClientID       = "681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com"
+	geminiOauthClientSecret   = "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"
+	geminiDefaultCallbackPort = 8085
 )
 
 var (
@@ -49,8 +50,9 @@ type GeminiAuth struct {
 
 // WebLoginOptions customizes the interactive OAuth flow.
 type WebLoginOptions struct {
-	NoBrowser bool
-	Prompt    func(string) (string, error)
+	NoBrowser    bool
+	CallbackPort int
+	Prompt       func(string) (string, error)
 }
 
 // NewGeminiAuth creates a new instance of GeminiAuth.
@@ -72,6 +74,12 @@ func NewGeminiAuth() *GeminiAuth {
 //   - *http.Client: An HTTP client configured with authentication
 //   - error: An error if the client configuration fails, nil otherwise
 func (g *GeminiAuth) GetAuthenticatedClient(ctx context.Context, ts *GeminiTokenStorage, cfg *config.Config, opts *WebLoginOptions) (*http.Client, error) {
+	callbackPort := geminiDefaultCallbackPort
+	if opts != nil && opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+	callbackURL := fmt.Sprintf("http://localhost:%d/oauth2callback", callbackPort)
+
 	// Configure proxy settings for the HTTP client if a proxy URL is provided.
 	proxyURL, err := url.Parse(cfg.ProxyURL)
 	if err == nil {
@@ -106,7 +114,7 @@ func (g *GeminiAuth) GetAuthenticatedClient(ctx context.Context, ts *GeminiToken
 	conf := &oauth2.Config{
 		ClientID:     geminiOauthClientID,
 		ClientSecret: geminiOauthClientSecret,
-		RedirectURL:  "http://localhost:8085/oauth2callback", // This will be used by the local server.
+		RedirectURL:  callbackURL, // This will be used by the local server.
 		Scopes:       geminiOauthScopes,
 		Endpoint:     google.Endpoint,
 	}
@@ -218,14 +226,20 @@ func (g *GeminiAuth) createTokenStorage(ctx context.Context, config *oauth2.Conf
 //   - *oauth2.Token: The OAuth2 token obtained from the authorization flow
 //   - error: An error if the token acquisition fails, nil otherwise
 func (g *GeminiAuth) getTokenFromWeb(ctx context.Context, config *oauth2.Config, opts *WebLoginOptions) (*oauth2.Token, error) {
+	callbackPort := geminiDefaultCallbackPort
+	if opts != nil && opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+	callbackURL := fmt.Sprintf("http://localhost:%d/oauth2callback", callbackPort)
+
 	// Use a channel to pass the authorization code from the HTTP handler to the main function.
 	codeChan := make(chan string, 1)
 	errChan := make(chan error, 1)
 
 	// Create a new HTTP server with its own multiplexer.
 	mux := http.NewServeMux()
-	server := &http.Server{Addr: ":8085", Handler: mux}
-	config.RedirectURL = "http://localhost:8085/oauth2callback"
+	server := &http.Server{Addr: fmt.Sprintf(":%d", callbackPort), Handler: mux}
+	config.RedirectURL = callbackURL
 
 	mux.HandleFunc("/oauth2callback", func(w http.ResponseWriter, r *http.Request) {
 		if err := r.URL.Query().Get("error"); err != "" {
@@ -277,13 +291,13 @@ func (g *GeminiAuth) getTokenFromWeb(ctx context.Context, config *oauth2.Config,
 		// Check if browser is available
 		if !browser.IsAvailable() {
 			log.Warn("No browser available on this system")
-			util.PrintSSHTunnelInstructions(8085)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Please manually open this URL in your browser:\n\n%s\n", authURL)
 		} else {
 			if err := browser.OpenURL(authURL); err != nil {
 				authErr := codex.NewAuthenticationError(codex.ErrBrowserOpenFailed, err)
 				log.Warn(codex.GetUserFriendlyMessage(authErr))
-				util.PrintSSHTunnelInstructions(8085)
+				util.PrintSSHTunnelInstructions(callbackPort)
 				fmt.Printf("Please manually open this URL in your browser:\n\n%s\n", authURL)
 
 				// Log platform info for debugging
@@ -294,7 +308,7 @@ func (g *GeminiAuth) getTokenFromWeb(ctx context.Context, config *oauth2.Config,
 			}
 		}
 	} else {
-		util.PrintSSHTunnelInstructions(8085)
+		util.PrintSSHTunnelInstructions(callbackPort)
 		fmt.Printf("Please open this URL in your browser:\n\n%s\n", authURL)
 	}
 

internal/cmd/anthropic_login.go

@@ -32,9 +32,10 @@ func DoClaudeLogin(cfg *config.Config, options *LoginOptions) {
 	manager := newAuthManager()
 
 	authOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		Metadata:  map[string]string{},
-		Prompt:    promptFn,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
 	}
 
 	_, savedPath, err := manager.Login(context.Background(), "claude", cfg, authOpts)

internal/cmd/antigravity_login.go

@@ -22,9 +22,10 @@ func DoAntigravityLogin(cfg *config.Config, options *LoginOptions) {
 
 	manager := newAuthManager()
 	authOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		Metadata:  map[string]string{},
-		Prompt:    promptFn,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
 	}
 
 	record, savedPath, err := manager.Login(context.Background(), "antigravity", cfg, authOpts)

internal/cmd/iflow_login.go

@@ -24,9 +24,10 @@ func DoIFlowLogin(cfg *config.Config, options *LoginOptions) {
 	}
 
 	authOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		Metadata:  map[string]string{},
-		Prompt:    promptFn,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
 	}
 
 	_, savedPath, err := manager.Login(context.Background(), "iflow", cfg, authOpts)

internal/cmd/login.go

@@ -67,10 +67,11 @@ func DoLogin(cfg *config.Config, projectID string, options *LoginOptions) {
 	}
 
 	loginOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		ProjectID: trimmedProjectID,
-		Metadata:  map[string]string{},
-		Prompt:    callbackPrompt,
+		NoBrowser:    options.NoBrowser,
+		ProjectID:    trimmedProjectID,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       callbackPrompt,
 	}
 
 	authenticator := sdkAuth.NewGeminiAuthenticator()
@@ -88,8 +89,9 @@ func DoLogin(cfg *config.Config, projectID string, options *LoginOptions) {
 
 	geminiAuth := gemini.NewGeminiAuth()
 	httpClient, errClient := geminiAuth.GetAuthenticatedClient(ctx, storage, cfg, &gemini.WebLoginOptions{
-		NoBrowser: options.NoBrowser,
-		Prompt:    callbackPrompt,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Prompt:       callbackPrompt,
 	})
 	if errClient != nil {
 		log.Errorf("Gemini authentication failed: %v", errClient)

internal/cmd/openai_login.go

@@ -19,6 +19,9 @@ type LoginOptions struct {
 	// NoBrowser indicates whether to skip opening the browser automatically.
 	NoBrowser bool
 
+	// CallbackPort overrides the local OAuth callback port when set (>0).
+	CallbackPort int
+
 	// Prompt allows the caller to provide interactive input when needed.
 	Prompt func(prompt string) (string, error)
 }
@@ -43,9 +46,10 @@ func DoCodexLogin(cfg *config.Config, options *LoginOptions) {
 	manager := newAuthManager()
 
 	authOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		Metadata:  map[string]string{},
-		Prompt:    promptFn,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
 	}
 
 	_, savedPath, err := manager.Login(context.Background(), "codex", cfg, authOpts)

internal/cmd/qwen_login.go

@@ -36,9 +36,10 @@ func DoQwenLogin(cfg *config.Config, options *LoginOptions) {
 	}
 
 	authOpts := &sdkAuth.LoginOptions{
-		NoBrowser: options.NoBrowser,
-		Metadata:  map[string]string{},
-		Prompt:    promptFn,
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
 	}
 
 	_, savedPath, err := manager.Login(context.Background(), "qwen", cfg, authOpts)

sdk/auth/antigravity.go

@@ -60,6 +60,11 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 		opts = &LoginOptions{}
 	}
 
+	callbackPort := antigravityCallbackPort
+	if opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+
 	httpClient := util.SetProxy(&cfg.SDKConfig, &http.Client{})
 
 	state, err := misc.GenerateRandomState()
@@ -67,7 +72,7 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 		return nil, fmt.Errorf("antigravity: failed to generate state: %w", err)
 	}
 
-	srv, port, cbChan, errServer := startAntigravityCallbackServer()
+	srv, port, cbChan, errServer := startAntigravityCallbackServer(callbackPort)
 	if errServer != nil {
 		return nil, fmt.Errorf("antigravity: failed to start callback server: %w", errServer)
 	}
@@ -224,13 +229,16 @@ type callbackResult struct {
 	State string
 }
 
-func startAntigravityCallbackServer() (*http.Server, int, <-chan callbackResult, error) {
-	addr := fmt.Sprintf(":%d", antigravityCallbackPort)
+func startAntigravityCallbackServer(port int) (*http.Server, int, <-chan callbackResult, error) {
+	if port <= 0 {
+		port = antigravityCallbackPort
+	}
+	addr := fmt.Sprintf(":%d", port)
 	listener, err := net.Listen("tcp", addr)
 	if err != nil {
 		return nil, 0, nil, err
 	}
-	port := listener.Addr().(*net.TCPAddr).Port
+	port = listener.Addr().(*net.TCPAddr).Port
 	resultCh := make(chan callbackResult, 1)
 
 	mux := http.NewServeMux()

sdk/auth/claude.go

@@ -47,6 +47,11 @@ func (a *ClaudeAuthenticator) Login(ctx context.Context, cfg *config.Config, opt
 		opts = &LoginOptions{}
 	}
 
+	callbackPort := a.CallbackPort
+	if opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+
 	pkceCodes, err := claude.GeneratePKCECodes()
 	if err != nil {
 		return nil, fmt.Errorf("claude pkce generation failed: %w", err)
@@ -57,7 +62,7 @@ func (a *ClaudeAuthenticator) Login(ctx context.Context, cfg *config.Config, opt
 		return nil, fmt.Errorf("claude state generation failed: %w", err)
 	}
 
-	oauthServer := claude.NewOAuthServer(a.CallbackPort)
+	oauthServer := claude.NewOAuthServer(callbackPort)
 	if err = oauthServer.Start(); err != nil {
 		if strings.Contains(err.Error(), "already in use") {
 			return nil, claude.NewAuthenticationError(claude.ErrPortInUse, err)
@@ -84,15 +89,15 @@ func (a *ClaudeAuthenticator) Login(ctx context.Context, cfg *config.Config, opt
 		fmt.Println("Opening browser for Claude authentication")
 		if !browser.IsAvailable() {
 			log.Warn("No browser available; please open the URL manually")
-			util.PrintSSHTunnelInstructions(a.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		} else if err = browser.OpenURL(authURL); err != nil {
 			log.Warnf("Failed to open browser automatically: %v", err)
-			util.PrintSSHTunnelInstructions(a.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		}
 	} else {
-		util.PrintSSHTunnelInstructions(a.CallbackPort)
+		util.PrintSSHTunnelInstructions(callbackPort)
 		fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 	}
 

sdk/auth/codex.go

@@ -47,6 +47,11 @@ func (a *CodexAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		opts = &LoginOptions{}
 	}
 
+	callbackPort := a.CallbackPort
+	if opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+
 	pkceCodes, err := codex.GeneratePKCECodes()
 	if err != nil {
 		return nil, fmt.Errorf("codex pkce generation failed: %w", err)
@@ -57,7 +62,7 @@ func (a *CodexAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		return nil, fmt.Errorf("codex state generation failed: %w", err)
 	}
 
-	oauthServer := codex.NewOAuthServer(a.CallbackPort)
+	oauthServer := codex.NewOAuthServer(callbackPort)
 	if err = oauthServer.Start(); err != nil {
 		if strings.Contains(err.Error(), "already in use") {
 			return nil, codex.NewAuthenticationError(codex.ErrPortInUse, err)
@@ -83,15 +88,15 @@ func (a *CodexAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		fmt.Println("Opening browser for Codex authentication")
 		if !browser.IsAvailable() {
 			log.Warn("No browser available; please open the URL manually")
-			util.PrintSSHTunnelInstructions(a.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		} else if err = browser.OpenURL(authURL); err != nil {
 			log.Warnf("Failed to open browser automatically: %v", err)
-			util.PrintSSHTunnelInstructions(a.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		}
 	} else {
-		util.PrintSSHTunnelInstructions(a.CallbackPort)
+		util.PrintSSHTunnelInstructions(callbackPort)
 		fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 	}
 

sdk/auth/gemini.go

@@ -45,8 +45,9 @@ func (a *GeminiAuthenticator) Login(ctx context.Context, cfg *config.Config, opt
 
 	geminiAuth := gemini.NewGeminiAuth()
 	_, err := geminiAuth.GetAuthenticatedClient(ctx, &ts, cfg, &gemini.WebLoginOptions{
-		NoBrowser: opts.NoBrowser,
-		Prompt:    opts.Prompt,
+		NoBrowser:    opts.NoBrowser,
+		CallbackPort: opts.CallbackPort,
+		Prompt:       opts.Prompt,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("gemini authentication failed: %w", err)

sdk/auth/iflow.go

@@ -42,9 +42,14 @@ func (a *IFlowAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		opts = &LoginOptions{}
 	}
 
+	callbackPort := iflow.CallbackPort
+	if opts.CallbackPort > 0 {
+		callbackPort = opts.CallbackPort
+	}
+
 	authSvc := iflow.NewIFlowAuth(cfg)
 
-	oauthServer := iflow.NewOAuthServer(iflow.CallbackPort)
+	oauthServer := iflow.NewOAuthServer(callbackPort)
 	if err := oauthServer.Start(); err != nil {
 		if strings.Contains(err.Error(), "already in use") {
 			return nil, fmt.Errorf("iflow authentication server port in use: %w", err)
@@ -64,21 +69,21 @@ func (a *IFlowAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		return nil, fmt.Errorf("iflow auth: failed to generate state: %w", err)
 	}
 
-	authURL, redirectURI := authSvc.AuthorizationURL(state, iflow.CallbackPort)
+	authURL, redirectURI := authSvc.AuthorizationURL(state, callbackPort)
 
 	if !opts.NoBrowser {
 		fmt.Println("Opening browser for iFlow authentication")
 		if !browser.IsAvailable() {
 			log.Warn("No browser available; please open the URL manually")
-			util.PrintSSHTunnelInstructions(iflow.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		} else if err = browser.OpenURL(authURL); err != nil {
 			log.Warnf("Failed to open browser automatically: %v", err)
-			util.PrintSSHTunnelInstructions(iflow.CallbackPort)
+			util.PrintSSHTunnelInstructions(callbackPort)
 			fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 		}
 	} else {
-		util.PrintSSHTunnelInstructions(iflow.CallbackPort)
+		util.PrintSSHTunnelInstructions(callbackPort)
 		fmt.Printf("Visit the following URL to continue authentication:\n%s\n", authURL)
 	}
 

sdk/auth/interfaces.go

@@ -14,10 +14,11 @@ var ErrRefreshNotSupported = errors.New("cliproxy auth: refresh not supported")
 // LoginOptions captures generic knobs shared across authenticators.
 // Provider-specific logic can inspect Metadata for extra parameters.
 type LoginOptions struct {
-	NoBrowser bool
-	ProjectID string
-	Metadata  map[string]string
-	Prompt    func(prompt string) (string, error)
+	NoBrowser    bool
+	ProjectID    string
+	CallbackPort int
+	Metadata     map[string]string
+	Prompt       func(prompt string) (string, error)
 }
 
 // Authenticator manages login and optional refresh flows for a provider.