fix(auth): avoid blocking oauth callback wait on prompt

internal/auth/gemini/gemini_auth.go

@@ -305,6 +305,9 @@ func (g *GeminiAuth) getTokenFromWeb(ctx context.Context, config *oauth2.Config,
 		defer manualPromptTimer.Stop()
 	}
 
+	var manualInputCh <-chan string
+	var manualInputErrCh <-chan error
+
 waitForCallback:
 	for {
 		select {
@@ -326,13 +329,25 @@ waitForCallback:
 				return nil, err
 			default:
 			}
+			inputCh := make(chan string, 1)
+			inputErrCh := make(chan error, 1)
+			go func() {
 				input, err := opts.Prompt("Paste the Gemini callback URL (or press Enter to keep waiting): ")
 				if err != nil {
-				return nil, err
+					inputErrCh <- err
+					return
 				}
-			parsed, err := misc.ParseOAuthCallback(input)
+				inputCh <- input
-			if err != nil {
+			}()
-				return nil, err
+			manualInputCh = inputCh
+			manualInputErrCh = inputErrCh
+			continue
+		case input := <-manualInputCh:
+			manualInputCh = nil
+			manualInputErrCh = nil
+			parsed, errParse := misc.ParseOAuthCallback(input)
+			if errParse != nil {
+				return nil, errParse
 			}
 			if parsed == nil {
 				continue
@@ -345,6 +360,8 @@ waitForCallback:
 			}
 			authCode = parsed.Code
 			break waitForCallback
+		case errManual := <-manualInputErrCh:
+			return nil, errManual
 		case <-timeoutTimer.C:
 			return nil, fmt.Errorf("oauth flow timed out")
 		}

sdk/auth/antigravity.go

@@ -98,6 +98,9 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 		defer manualPromptTimer.Stop()
 	}
 
+	var manualInputCh <-chan string
+	var manualInputErrCh <-chan error
+
 waitForCallback:
 	for {
 		select {
@@ -115,10 +118,22 @@ waitForCallback:
 				break waitForCallback
 			default:
 			}
+			inputCh := make(chan string, 1)
+			inputErrCh := make(chan error, 1)
+			go func() {
 				input, errPrompt := opts.Prompt("Paste the antigravity callback URL (or press Enter to keep waiting): ")
 				if errPrompt != nil {
-				return nil, errPrompt
+					inputErrCh <- errPrompt
+					return
 				}
+				inputCh <- input
+			}()
+			manualInputCh = inputCh
+			manualInputErrCh = inputErrCh
+			continue
+		case input := <-manualInputCh:
+			manualInputCh = nil
+			manualInputErrCh = nil
 			parsed, errParse := misc.ParseOAuthCallback(input)
 			if errParse != nil {
 				return nil, errParse
@@ -132,6 +147,8 @@ waitForCallback:
 				Error: parsed.Error,
 			}
 			break waitForCallback
+		case errManual := <-manualInputErrCh:
+			return nil, errManual
 		case <-timeoutTimer.C:
 			return nil, fmt.Errorf("antigravity: authentication timed out")
 		}

sdk/auth/claude.go

@@ -124,6 +124,9 @@ func (a *ClaudeAuthenticator) Login(ctx context.Context, cfg *config.Config, opt
 		defer manualPromptTimer.Stop()
 	}
 
+	var manualInputCh <-chan string
+	var manualInputErrCh <-chan error
+
 waitForCallback:
 	for {
 		select {
@@ -149,10 +152,22 @@ waitForCallback:
 				return nil, err
 			default:
 			}
+			inputCh := make(chan string, 1)
+			inputErrCh := make(chan error, 1)
+			go func() {
 				input, errPrompt := opts.Prompt("Paste the Claude callback URL (or press Enter to keep waiting): ")
 				if errPrompt != nil {
-				return nil, errPrompt
+					inputErrCh <- errPrompt
+					return
 				}
+				inputCh <- input
+			}()
+			manualInputCh = inputCh
+			manualInputErrCh = inputErrCh
+			continue
+		case input := <-manualInputCh:
+			manualInputCh = nil
+			manualInputErrCh = nil
 			parsed, errParse := misc.ParseOAuthCallback(input)
 			if errParse != nil {
 				return nil, errParse
@@ -167,6 +182,8 @@ waitForCallback:
 				Error: parsed.Error,
 			}
 			break waitForCallback
+		case errManual := <-manualInputErrCh:
+			return nil, errManual
 		}
 	}
 

sdk/auth/codex.go

@@ -127,6 +127,9 @@ func (a *CodexAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		defer manualPromptTimer.Stop()
 	}
 
+	var manualInputCh <-chan string
+	var manualInputErrCh <-chan error
+
 waitForCallback:
 	for {
 		select {
@@ -152,10 +155,22 @@ waitForCallback:
 				return nil, err
 			default:
 			}
+			inputCh := make(chan string, 1)
+			inputErrCh := make(chan error, 1)
+			go func() {
 				input, errPrompt := opts.Prompt("Paste the Codex callback URL (or press Enter to keep waiting): ")
 				if errPrompt != nil {
-				return nil, errPrompt
+					inputErrCh <- errPrompt
+					return
 				}
+				inputCh <- input
+			}()
+			manualInputCh = inputCh
+			manualInputErrCh = inputErrCh
+			continue
+		case input := <-manualInputCh:
+			manualInputCh = nil
+			manualInputErrCh = nil
 			parsed, errParse := misc.ParseOAuthCallback(input)
 			if errParse != nil {
 				return nil, errParse
@@ -170,6 +185,8 @@ waitForCallback:
 				Error: parsed.Error,
 			}
 			break waitForCallback
+		case errManual := <-manualInputErrCh:
+			return nil, errManual
 		}
 	}
 

sdk/auth/iflow.go

@@ -109,6 +109,9 @@ func (a *IFlowAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 		defer manualPromptTimer.Stop()
 	}
 
+	var manualInputCh <-chan string
+	var manualInputErrCh <-chan error
+
 waitForCallback:
 	for {
 		select {
@@ -128,10 +131,22 @@ waitForCallback:
 				return nil, fmt.Errorf("iflow auth: callback wait failed: %w", err)
 			default:
 			}
+			inputCh := make(chan string, 1)
+			inputErrCh := make(chan error, 1)
+			go func() {
 				input, errPrompt := opts.Prompt("Paste the iFlow callback URL (or press Enter to keep waiting): ")
 				if errPrompt != nil {
-				return nil, errPrompt
+					inputErrCh <- errPrompt
+					return
 				}
+				inputCh <- input
+			}()
+			manualInputCh = inputCh
+			manualInputErrCh = inputErrCh
+			continue
+		case input := <-manualInputCh:
+			manualInputCh = nil
+			manualInputErrCh = nil
 			parsed, errParse := misc.ParseOAuthCallback(input)
 			if errParse != nil {
 				return nil, errParse
@@ -145,6 +160,8 @@ waitForCallback:
 				Error: parsed.Error,
 			}
 			break waitForCallback
+		case errManual := <-manualInputErrCh:
+			return nil, errManual
 		}
 	}
 	if result.Error != "" {