feat(kiro): 新增 AWS Builder ID 授权码流程认证及用户邮箱获取增强

Amp-Thread-ID: https://ampcode.com/threads/T-019b2ecc-fb2d-713f-b30d-1196c7dce3e2
Co-authored-by: Amp <amp@ampcode.com>

cmd/server/main.go

@@ -78,6 +78,7 @@ func main() {
 	var kiroLogin bool
 	var kiroGoogleLogin bool
 	var kiroAWSLogin bool
+	var kiroAWSAuthCode bool
 	var kiroImport bool
 	var githubCopilotLogin bool
 	var projectID string
@@ -101,6 +102,7 @@ func main() {
 	flag.BoolVar(&kiroLogin, "kiro-login", false, "Login to Kiro using Google OAuth")
 	flag.BoolVar(&kiroGoogleLogin, "kiro-google-login", false, "Login to Kiro using Google OAuth (same as --kiro-login)")
 	flag.BoolVar(&kiroAWSLogin, "kiro-aws-login", false, "Login to Kiro using AWS Builder ID (device code flow)")
+	flag.BoolVar(&kiroAWSAuthCode, "kiro-aws-authcode", false, "Login to Kiro using AWS Builder ID (authorization code flow, better UX)")
 	flag.BoolVar(&kiroImport, "kiro-import", false, "Import Kiro token from Kiro IDE (~/.aws/sso/cache/kiro-auth-token.json)")
 	flag.BoolVar(&githubCopilotLogin, "github-copilot-login", false, "Login to GitHub Copilot using device flow")
 	flag.StringVar(&projectID, "project_id", "", "Project ID (Gemini only, not required)")
@@ -513,6 +515,10 @@ func main() {
 		// Users can explicitly override with --no-incognito
 		setKiroIncognitoMode(cfg, useIncognito, noIncognito)
 		cmd.DoKiroAWSLogin(cfg, options)
+	} else if kiroAWSAuthCode {
+		// For Kiro auth with authorization code flow (better UX)
+		setKiroIncognitoMode(cfg, useIncognito, noIncognito)
+		cmd.DoKiroAWSAuthCodeLogin(cfg, options)
 	} else if kiroImport {
 		cmd.DoKiroImport(cfg, options)
 	} else {

internal/auth/kiro/codewhisperer_client.go

@@ -0,0 +1,166 @@
+// Package kiro provides CodeWhisperer API client for fetching user info.
+package kiro
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	codeWhispererAPI = "https://codewhisperer.us-east-1.amazonaws.com"
+	kiroVersion      = "0.6.18"
+)
+
+// CodeWhispererClient handles CodeWhisperer API calls.
+type CodeWhispererClient struct {
+	httpClient *http.Client
+	machineID  string
+}
+
+// UsageLimitsResponse represents the getUsageLimits API response.
+type UsageLimitsResponse struct {
+	DaysUntilReset     *int                `json:"daysUntilReset,omitempty"`
+	NextDateReset      *float64            `json:"nextDateReset,omitempty"`
+	UserInfo           *UserInfo           `json:"userInfo,omitempty"`
+	SubscriptionInfo   *SubscriptionInfo   `json:"subscriptionInfo,omitempty"`
+	UsageBreakdownList []UsageBreakdown    `json:"usageBreakdownList,omitempty"`
+}
+
+// UserInfo contains user information from the API.
+type UserInfo struct {
+	Email  string `json:"email,omitempty"`
+	UserID string `json:"userId,omitempty"`
+}
+
+// SubscriptionInfo contains subscription details.
+type SubscriptionInfo struct {
+	SubscriptionTitle string `json:"subscriptionTitle,omitempty"`
+	Type              string `json:"type,omitempty"`
+}
+
+// UsageBreakdown contains usage details.
+type UsageBreakdown struct {
+	UsageLimit                 *int     `json:"usageLimit,omitempty"`
+	CurrentUsage               *int     `json:"currentUsage,omitempty"`
+	UsageLimitWithPrecision    *float64 `json:"usageLimitWithPrecision,omitempty"`
+	CurrentUsageWithPrecision  *float64 `json:"currentUsageWithPrecision,omitempty"`
+	NextDateReset              *float64 `json:"nextDateReset,omitempty"`
+	DisplayName                string   `json:"displayName,omitempty"`
+	ResourceType               string   `json:"resourceType,omitempty"`
+}
+
+// NewCodeWhispererClient creates a new CodeWhisperer client.
+func NewCodeWhispererClient(cfg *config.Config, machineID string) *CodeWhispererClient {
+	client := &http.Client{Timeout: 30 * time.Second}
+	if cfg != nil {
+		client = util.SetProxy(&cfg.SDKConfig, client)
+	}
+	if machineID == "" {
+		machineID = uuid.New().String()
+	}
+	return &CodeWhispererClient{
+		httpClient: client,
+		machineID:  machineID,
+	}
+}
+
+// generateInvocationID generates a unique invocation ID.
+func generateInvocationID() string {
+	return uuid.New().String()
+}
+
+// GetUsageLimits fetches usage limits and user info from CodeWhisperer API.
+// This is the recommended way to get user email after login.
+func (c *CodeWhispererClient) GetUsageLimits(ctx context.Context, accessToken string) (*UsageLimitsResponse, error) {
+	url := fmt.Sprintf("%s/getUsageLimits?isEmailRequired=true&origin=AI_EDITOR&resourceType=AGENTIC_REQUEST", codeWhispererAPI)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	// Set headers to match Kiro IDE
+	xAmzUserAgent := fmt.Sprintf("aws-sdk-js/1.0.0 KiroIDE-%s-%s", kiroVersion, c.machineID)
+	userAgent := fmt.Sprintf("aws-sdk-js/1.0.0 ua/2.1 os/windows lang/js md/nodejs#20.16.0 api/codewhispererruntime#1.0.0 m/E KiroIDE-%s-%s", kiroVersion, c.machineID)
+
+	req.Header.Set("Authorization", "Bearer "+accessToken)
+	req.Header.Set("x-amz-user-agent", xAmzUserAgent)
+	req.Header.Set("User-Agent", userAgent)
+	req.Header.Set("amz-sdk-invocation-id", generateInvocationID())
+	req.Header.Set("amz-sdk-request", "attempt=1; max=1")
+	req.Header.Set("Connection", "close")
+
+	log.Debugf("codewhisperer: GET %s", url)
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	log.Debugf("codewhisperer: status=%d, body=%s", resp.StatusCode, string(body))
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var result UsageLimitsResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &result, nil
+}
+
+// FetchUserEmailFromAPI fetches user email using CodeWhisperer getUsageLimits API.
+// This is more reliable than JWT parsing as it uses the official API.
+func (c *CodeWhispererClient) FetchUserEmailFromAPI(ctx context.Context, accessToken string) string {
+	resp, err := c.GetUsageLimits(ctx, accessToken)
+	if err != nil {
+		log.Debugf("codewhisperer: failed to get usage limits: %v", err)
+		return ""
+	}
+
+	if resp.UserInfo != nil && resp.UserInfo.Email != "" {
+		log.Debugf("codewhisperer: got email from API: %s", resp.UserInfo.Email)
+		return resp.UserInfo.Email
+	}
+
+	log.Debugf("codewhisperer: no email in response")
+	return ""
+}
+
+// FetchUserEmailWithFallback fetches user email with multiple fallback methods.
+// Priority: 1. CodeWhisperer API  2. userinfo endpoint  3. JWT parsing
+func FetchUserEmailWithFallback(ctx context.Context, cfg *config.Config, accessToken string) string {
+	// Method 1: Try CodeWhisperer API (most reliable)
+	cwClient := NewCodeWhispererClient(cfg, "")
+	email := cwClient.FetchUserEmailFromAPI(ctx, accessToken)
+	if email != "" {
+		return email
+	}
+
+	// Method 2: Try SSO OIDC userinfo endpoint
+	ssoClient := NewSSOOIDCClient(cfg)
+	email = ssoClient.FetchUserEmail(ctx, accessToken)
+	if email != "" {
+		return email
+	}
+
+	// Method 3: Fallback to JWT parsing
+	return ExtractEmailFromJWT(accessToken)
+}

internal/auth/kiro/oauth.go

@@ -163,6 +163,13 @@ func (o *KiroOAuth) LoginWithBuilderID(ctx context.Context) (*KiroTokenData, err
 	return ssoClient.LoginWithBuilderID(ctx)
 }
 
+// LoginWithBuilderIDAuthCode performs OAuth login with AWS Builder ID using authorization code flow.
+// This provides a better UX than device code flow as it uses automatic browser callback.
+func (o *KiroOAuth) LoginWithBuilderIDAuthCode(ctx context.Context) (*KiroTokenData, error) {
+	ssoClient := NewSSOOIDCClient(o.cfg)
+	return ssoClient.LoginWithBuilderIDAuthCode(ctx)
+}
+
 // exchangeCodeForToken exchanges the authorization code for tokens.
 func (o *KiroOAuth) exchangeCodeForToken(ctx context.Context, code, codeVerifier, redirectURI string) (*KiroTokenData, error) {
 	payload := map[string]string{

internal/auth/kiro/sso_oidc.go

@@ -3,9 +3,14 @@ package kiro
 
 import (
 	"context"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"html"
 	"io"
+	"net"
 	"net/http"
 	"strings"
 	"time"
@@ -25,6 +30,13 @@ const (
 	
 	// Polling interval
 	pollInterval = 5 * time.Second
+	
+	// Authorization code flow callback
+	authCodeCallbackPath = "/oauth/callback"
+	authCodeCallbackPort = 19877
+	
+	// User-Agent to match official Kiro IDE
+	kiroUserAgent = "KiroIDE"
 )
 
 // SSOOIDCClient handles AWS SSO OIDC authentication.
@@ -73,13 +85,11 @@ type CreateTokenResponse struct {
 
 // RegisterClient registers a new OIDC client with AWS.
 func (c *SSOOIDCClient) RegisterClient(ctx context.Context) (*RegisterClientResponse, error) {
-	// Generate unique client name for each registration to support multiple accounts
-	clientName := fmt.Sprintf("CLI-Proxy-API-%d", time.Now().UnixNano())
-	
 	payload := map[string]interface{}{
-		"clientName": clientName,
+		"clientName": "Kiro IDE",
 		"clientType": "public",
-		"scopes":     []string{"codewhisperer:completions", "codewhisperer:analysis", "codewhisperer:conversations"},
+		"scopes":     []string{"codewhisperer:completions", "codewhisperer:analysis", "codewhisperer:conversations", "codewhisperer:transformations", "codewhisperer:taskassist"},
+		"grantTypes": []string{"urn:ietf:params:oauth:grant-type:device_code", "refresh_token"},
 	}
 
 	body, err := json.Marshal(payload)
@@ -92,6 +102,7 @@ func (c *SSOOIDCClient) RegisterClient(ctx context.Context) (*RegisterClientResp
 		return nil, err
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -135,6 +146,7 @@ func (c *SSOOIDCClient) StartDeviceAuthorization(ctx context.Context, clientID,
 		return nil, err
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -179,6 +191,7 @@ func (c *SSOOIDCClient) CreateToken(ctx context.Context, clientID, clientSecret,
 		return nil, err
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -240,6 +253,7 @@ func (c *SSOOIDCClient) RefreshToken(ctx context.Context, clientID, clientSecret
 		return nil, err
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -370,8 +384,8 @@ func (c *SSOOIDCClient) LoginWithBuilderID(ctx context.Context) (*KiroTokenData,
 			fmt.Println("Fetching profile information...")
 			profileArn := c.fetchProfileArn(ctx, tokenResp.AccessToken)
 
-			// Extract email from JWT access token
-			email := ExtractEmailFromJWT(tokenResp.AccessToken)
+			// Fetch user email (tries CodeWhisperer API first, then userinfo endpoint, then JWT parsing)
+			email := FetchUserEmailWithFallback(ctx, c.cfg, tokenResp.AccessToken)
 			if email != "" {
 				fmt.Printf("  Logged in as: %s\n", email)
 			}
@@ -399,6 +413,68 @@ func (c *SSOOIDCClient) LoginWithBuilderID(ctx context.Context) (*KiroTokenData,
 	return nil, fmt.Errorf("authorization timed out")
 }
 
+// FetchUserEmail retrieves the user's email from AWS SSO OIDC userinfo endpoint.
+// Falls back to JWT parsing if userinfo fails.
+func (c *SSOOIDCClient) FetchUserEmail(ctx context.Context, accessToken string) string {
+	// Method 1: Try userinfo endpoint (standard OIDC)
+	email := c.tryUserInfoEndpoint(ctx, accessToken)
+	if email != "" {
+		return email
+	}
+
+	// Method 2: Fallback to JWT parsing
+	return ExtractEmailFromJWT(accessToken)
+}
+
+// tryUserInfoEndpoint attempts to get user info from AWS SSO OIDC userinfo endpoint.
+func (c *SSOOIDCClient) tryUserInfoEndpoint(ctx context.Context, accessToken string) string {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, ssoOIDCEndpoint+"/userinfo", nil)
+	if err != nil {
+		return ""
+	}
+	req.Header.Set("Authorization", "Bearer "+accessToken)
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		log.Debugf("userinfo request failed: %v", err)
+		return ""
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		respBody, _ := io.ReadAll(resp.Body)
+		log.Debugf("userinfo endpoint returned status %d: %s", resp.StatusCode, string(respBody))
+		return ""
+	}
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return ""
+	}
+
+	log.Debugf("userinfo response: %s", string(respBody))
+
+	var userInfo struct {
+		Email             string `json:"email"`
+		Sub               string `json:"sub"`
+		PreferredUsername string `json:"preferred_username"`
+		Name              string `json:"name"`
+	}
+
+	if err := json.Unmarshal(respBody, &userInfo); err != nil {
+		return ""
+	}
+
+	if userInfo.Email != "" {
+		return userInfo.Email
+	}
+	if userInfo.PreferredUsername != "" && strings.Contains(userInfo.PreferredUsername, "@") {
+		return userInfo.PreferredUsername
+	}
+	return ""
+}
+
 // fetchProfileArn retrieves the profile ARN from CodeWhisperer API.
 // This is needed for file naming since AWS SSO OIDC doesn't return profile info.
 func (c *SSOOIDCClient) fetchProfileArn(ctx context.Context, accessToken string) string {
@@ -525,3 +601,323 @@ func (c *SSOOIDCClient) tryListCustomizations(ctx context.Context, accessToken s
 
 	return ""
 }
+
+// RegisterClientForAuthCode registers a new OIDC client for authorization code flow.
+func (c *SSOOIDCClient) RegisterClientForAuthCode(ctx context.Context, redirectURI string) (*RegisterClientResponse, error) {
+	payload := map[string]interface{}{
+		"clientName":   "Kiro IDE",
+		"clientType":   "public",
+		"scopes":       []string{"codewhisperer:completions", "codewhisperer:analysis", "codewhisperer:conversations", "codewhisperer:transformations", "codewhisperer:taskassist"},
+		"grantTypes":   []string{"authorization_code", "refresh_token"},
+		"redirectUris": []string{redirectURI},
+		"issuerUrl":    builderIDStartURL,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, ssoOIDCEndpoint+"/client/register", strings.NewReader(string(body)))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		log.Debugf("register client for auth code failed (status %d): %s", resp.StatusCode, string(respBody))
+		return nil, fmt.Errorf("register client failed (status %d)", resp.StatusCode)
+	}
+
+	var result RegisterClientResponse
+	if err := json.Unmarshal(respBody, &result); err != nil {
+		return nil, err
+	}
+
+	return &result, nil
+}
+
+// AuthCodeCallbackResult contains the result from authorization code callback.
+type AuthCodeCallbackResult struct {
+	Code  string
+	State string
+	Error string
+}
+
+// startAuthCodeCallbackServer starts a local HTTP server to receive the authorization code callback.
+func (c *SSOOIDCClient) startAuthCodeCallbackServer(ctx context.Context, expectedState string) (string, <-chan AuthCodeCallbackResult, error) {
+	// Try to find an available port
+	listener, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", authCodeCallbackPort))
+	if err != nil {
+		// Try with dynamic port
+		log.Warnf("sso oidc: default port %d is busy, falling back to dynamic port", authCodeCallbackPort)
+		listener, err = net.Listen("tcp", "127.0.0.1:0")
+		if err != nil {
+			return "", nil, fmt.Errorf("failed to start callback server: %w", err)
+		}
+	}
+
+	port := listener.Addr().(*net.TCPAddr).Port
+	redirectURI := fmt.Sprintf("http://127.0.0.1:%d%s", port, authCodeCallbackPath)
+	resultChan := make(chan AuthCodeCallbackResult, 1)
+
+	server := &http.Server{
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc(authCodeCallbackPath, func(w http.ResponseWriter, r *http.Request) {
+		code := r.URL.Query().Get("code")
+		state := r.URL.Query().Get("state")
+		errParam := r.URL.Query().Get("error")
+
+		// Send response to browser
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		if errParam != "" {
+			w.WriteHeader(http.StatusBadRequest)
+			fmt.Fprintf(w, `<!DOCTYPE html>
+<html><head><title>Login Failed</title></head>
+<body><h1>Login Failed</h1><p>Error: %s</p><p>You can close this window.</p></body></html>`, html.EscapeString(errParam))
+			resultChan <- AuthCodeCallbackResult{Error: errParam}
+			return
+		}
+
+		if state != expectedState {
+			w.WriteHeader(http.StatusBadRequest)
+			fmt.Fprint(w, `<!DOCTYPE html>
+<html><head><title>Login Failed</title></head>
+<body><h1>Login Failed</h1><p>Invalid state parameter</p><p>You can close this window.</p></body></html>`)
+			resultChan <- AuthCodeCallbackResult{Error: "state mismatch"}
+			return
+		}
+
+		fmt.Fprint(w, `<!DOCTYPE html>
+<html><head><title>Login Successful</title></head>
+<body><h1>Login Successful!</h1><p>You can close this window and return to the terminal.</p>
+<script>window.close();</script></body></html>`)
+		resultChan <- AuthCodeCallbackResult{Code: code, State: state}
+	})
+
+	server.Handler = mux
+
+	go func() {
+		if err := server.Serve(listener); err != nil && err != http.ErrServerClosed {
+			log.Debugf("auth code callback server error: %v", err)
+		}
+	}()
+
+	go func() {
+		select {
+		case <-ctx.Done():
+		case <-time.After(10 * time.Minute):
+		case <-resultChan:
+		}
+		_ = server.Shutdown(context.Background())
+	}()
+
+	return redirectURI, resultChan, nil
+}
+
+// generatePKCEForAuthCode generates PKCE code verifier and challenge for authorization code flow.
+func generatePKCEForAuthCode() (verifier, challenge string, err error) {
+	b := make([]byte, 32)
+	if _, err := rand.Read(b); err != nil {
+		return "", "", fmt.Errorf("failed to generate random bytes: %w", err)
+	}
+	verifier = base64.RawURLEncoding.EncodeToString(b)
+	h := sha256.Sum256([]byte(verifier))
+	challenge = base64.RawURLEncoding.EncodeToString(h[:])
+	return verifier, challenge, nil
+}
+
+// generateStateForAuthCode generates a random state parameter.
+func generateStateForAuthCode() (string, error) {
+	b := make([]byte, 16)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+// CreateTokenWithAuthCode exchanges authorization code for tokens.
+func (c *SSOOIDCClient) CreateTokenWithAuthCode(ctx context.Context, clientID, clientSecret, code, codeVerifier, redirectURI string) (*CreateTokenResponse, error) {
+	payload := map[string]string{
+		"clientId":     clientID,
+		"clientSecret": clientSecret,
+		"code":         code,
+		"codeVerifier": codeVerifier,
+		"redirectUri":  redirectURI,
+		"grantType":    "authorization_code",
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, ssoOIDCEndpoint+"/token", strings.NewReader(string(body)))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", kiroUserAgent)
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		log.Debugf("create token with auth code failed (status %d): %s", resp.StatusCode, string(respBody))
+		return nil, fmt.Errorf("create token failed (status %d)", resp.StatusCode)
+	}
+
+	var result CreateTokenResponse
+	if err := json.Unmarshal(respBody, &result); err != nil {
+		return nil, err
+	}
+
+	return &result, nil
+}
+
+// LoginWithBuilderIDAuthCode performs the authorization code flow for AWS Builder ID.
+// This provides a better UX than device code flow as it uses automatic browser callback.
+func (c *SSOOIDCClient) LoginWithBuilderIDAuthCode(ctx context.Context) (*KiroTokenData, error) {
+	fmt.Println("\n╔══════════════════════════════════════════════════════════╗")
+	fmt.Println("║     Kiro Authentication (AWS Builder ID - Auth Code)      ║")
+	fmt.Println("╚══════════════════════════════════════════════════════════╝")
+
+	// Step 1: Generate PKCE and state
+	codeVerifier, codeChallenge, err := generatePKCEForAuthCode()
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate PKCE: %w", err)
+	}
+
+	state, err := generateStateForAuthCode()
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate state: %w", err)
+	}
+
+	// Step 2: Start callback server
+	fmt.Println("\nStarting callback server...")
+	redirectURI, resultChan, err := c.startAuthCodeCallbackServer(ctx, state)
+	if err != nil {
+		return nil, fmt.Errorf("failed to start callback server: %w", err)
+	}
+	log.Debugf("Callback server started, redirect URI: %s", redirectURI)
+
+	// Step 3: Register client with auth code grant type
+	fmt.Println("Registering client...")
+	regResp, err := c.RegisterClientForAuthCode(ctx, redirectURI)
+	if err != nil {
+		return nil, fmt.Errorf("failed to register client: %w", err)
+	}
+	log.Debugf("Client registered: %s", regResp.ClientID)
+
+	// Step 4: Build authorization URL
+	scopes := "codewhisperer:completions,codewhisperer:analysis,codewhisperer:conversations"
+	authURL := fmt.Sprintf("%s/authorize?response_type=code&client_id=%s&redirect_uri=%s&scopes=%s&state=%s&code_challenge=%s&code_challenge_method=S256",
+		ssoOIDCEndpoint,
+		regResp.ClientID,
+		redirectURI,
+		scopes,
+		state,
+		codeChallenge,
+	)
+
+	// Step 5: Open browser
+	fmt.Println("\n════════════════════════════════════════════════════════════")
+	fmt.Println("  Opening browser for authentication...")
+	fmt.Println("════════════════════════════════════════════════════════════")
+	fmt.Printf("\n  URL: %s\n\n", authURL)
+
+	// Set incognito mode
+	if c.cfg != nil {
+		browser.SetIncognitoMode(c.cfg.IncognitoBrowser)
+	} else {
+		browser.SetIncognitoMode(true)
+	}
+
+	if err := browser.OpenURL(authURL); err != nil {
+		log.Warnf("Could not open browser automatically: %v", err)
+		fmt.Println("  ⚠ Could not open browser automatically.")
+		fmt.Println("  Please open the URL above in your browser manually.")
+	} else {
+		fmt.Println("  (Browser opened automatically)")
+	}
+
+	fmt.Println("\n  Waiting for authorization callback...")
+
+	// Step 6: Wait for callback
+	select {
+	case <-ctx.Done():
+		browser.CloseBrowser()
+		return nil, ctx.Err()
+	case <-time.After(10 * time.Minute):
+		browser.CloseBrowser()
+		return nil, fmt.Errorf("authorization timed out")
+	case result := <-resultChan:
+		if result.Error != "" {
+			browser.CloseBrowser()
+			return nil, fmt.Errorf("authorization failed: %s", result.Error)
+		}
+
+		fmt.Println("\n✓ Authorization received!")
+
+		// Close browser
+		if err := browser.CloseBrowser(); err != nil {
+			log.Debugf("Failed to close browser: %v", err)
+		}
+
+		// Step 7: Exchange code for tokens
+		fmt.Println("Exchanging code for tokens...")
+		tokenResp, err := c.CreateTokenWithAuthCode(ctx, regResp.ClientID, regResp.ClientSecret, result.Code, codeVerifier, redirectURI)
+		if err != nil {
+			return nil, fmt.Errorf("failed to exchange code for tokens: %w", err)
+		}
+
+		fmt.Println("\n✓ Authentication successful!")
+
+		// Step 8: Get profile ARN
+		fmt.Println("Fetching profile information...")
+		profileArn := c.fetchProfileArn(ctx, tokenResp.AccessToken)
+
+		// Fetch user email (tries CodeWhisperer API first, then userinfo endpoint, then JWT parsing)
+		email := FetchUserEmailWithFallback(ctx, c.cfg, tokenResp.AccessToken)
+		if email != "" {
+			fmt.Printf("  Logged in as: %s\n", email)
+		}
+
+		expiresAt := time.Now().Add(time.Duration(tokenResp.ExpiresIn) * time.Second)
+
+		return &KiroTokenData{
+			AccessToken:  tokenResp.AccessToken,
+			RefreshToken: tokenResp.RefreshToken,
+			ProfileArn:   profileArn,
+			ExpiresAt:    expiresAt.Format(time.RFC3339),
+			AuthMethod:   "builder-id",
+			Provider:     "AWS",
+			ClientID:     regResp.ClientID,
+			ClientSecret: regResp.ClientSecret,
+			Email:        email,
+		}, nil
+	}
+}

internal/cmd/kiro_login.go

@@ -116,6 +116,54 @@ func DoKiroAWSLogin(cfg *config.Config, options *LoginOptions) {
 	fmt.Println("Kiro AWS authentication successful!")
 }
 
+// DoKiroAWSAuthCodeLogin triggers Kiro authentication with AWS Builder ID using authorization code flow.
+// This provides a better UX than device code flow as it uses automatic browser callback.
+//
+// Parameters:
+//   - cfg: The application configuration
+//   - options: Login options including prompts
+func DoKiroAWSAuthCodeLogin(cfg *config.Config, options *LoginOptions) {
+	if options == nil {
+		options = &LoginOptions{}
+	}
+
+	// Note: Kiro defaults to incognito mode for multi-account support.
+	// Users can override with --no-incognito if they want to use existing browser sessions.
+
+	manager := newAuthManager()
+
+	// Use KiroAuthenticator with AWS Builder ID login (authorization code flow)
+	authenticator := sdkAuth.NewKiroAuthenticator()
+	record, err := authenticator.LoginWithAuthCode(context.Background(), cfg, &sdkAuth.LoginOptions{
+		NoBrowser: options.NoBrowser,
+		Metadata:  map[string]string{},
+		Prompt:    options.Prompt,
+	})
+	if err != nil {
+		log.Errorf("Kiro AWS authentication (auth code) failed: %v", err)
+		fmt.Println("\nTroubleshooting:")
+		fmt.Println("1. Make sure you have an AWS Builder ID")
+		fmt.Println("2. Complete the authorization in the browser")
+		fmt.Println("3. If callback fails, try: --kiro-aws-login (device code flow)")
+		return
+	}
+
+	// Save the auth record
+	savedPath, err := manager.SaveAuth(record, cfg)
+	if err != nil {
+		log.Errorf("Failed to save auth: %v", err)
+		return
+	}
+
+	if savedPath != "" {
+		fmt.Printf("Authentication saved to %s\n", savedPath)
+	}
+	if record != nil && record.Label != "" {
+		fmt.Printf("Authenticated as %s\n", record.Label)
+	}
+	fmt.Println("Kiro AWS authentication successful!")
+}
+
 // DoKiroImport imports Kiro token from Kiro IDE's token file.
 // This is useful for users who have already logged in via Kiro IDE
 // and want to use the same credentials in CLI Proxy API.

sdk/auth/kiro.go

@@ -117,6 +117,71 @@ func (a *KiroAuthenticator) Login(ctx context.Context, cfg *config.Config, opts
 	return record, nil
 }
 
+// LoginWithAuthCode performs OAuth login for Kiro with AWS Builder ID using authorization code flow.
+// This provides a better UX than device code flow as it uses automatic browser callback.
+func (a *KiroAuthenticator) LoginWithAuthCode(ctx context.Context, cfg *config.Config, opts *LoginOptions) (*coreauth.Auth, error) {
+	if cfg == nil {
+		return nil, fmt.Errorf("kiro auth: configuration is required")
+	}
+
+	oauth := kiroauth.NewKiroOAuth(cfg)
+
+	// Use AWS Builder ID authorization code flow
+	tokenData, err := oauth.LoginWithBuilderIDAuthCode(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("login failed: %w", err)
+	}
+
+	// Parse expires_at
+	expiresAt, err := time.Parse(time.RFC3339, tokenData.ExpiresAt)
+	if err != nil {
+		expiresAt = time.Now().Add(1 * time.Hour)
+	}
+
+	// Extract identifier for file naming
+	idPart := extractKiroIdentifier(tokenData.Email, tokenData.ProfileArn)
+
+	now := time.Now()
+	fileName := fmt.Sprintf("kiro-aws-%s.json", idPart)
+
+	record := &coreauth.Auth{
+		ID:        fileName,
+		Provider:  "kiro",
+		FileName:  fileName,
+		Label:     "kiro-aws",
+		Status:    coreauth.StatusActive,
+		CreatedAt: now,
+		UpdatedAt: now,
+		Metadata: map[string]any{
+			"type":          "kiro",
+			"access_token":  tokenData.AccessToken,
+			"refresh_token": tokenData.RefreshToken,
+			"profile_arn":   tokenData.ProfileArn,
+			"expires_at":    tokenData.ExpiresAt,
+			"auth_method":   tokenData.AuthMethod,
+			"provider":      tokenData.Provider,
+			"client_id":     tokenData.ClientID,
+			"client_secret": tokenData.ClientSecret,
+			"email":         tokenData.Email,
+		},
+		Attributes: map[string]string{
+			"profile_arn": tokenData.ProfileArn,
+			"source":      "aws-builder-id-authcode",
+			"email":       tokenData.Email,
+		},
+		// NextRefreshAfter is aligned with RefreshLead (5min)
+		NextRefreshAfter: expiresAt.Add(-5 * time.Minute),
+	}
+
+	if tokenData.Email != "" {
+		fmt.Printf("\n✓ Kiro authentication completed successfully! (Account: %s)\n", tokenData.Email)
+	} else {
+		fmt.Println("\n✓ Kiro authentication completed successfully!")
+	}
+
+	return record, nil
+}
+
 // LoginWithGoogle performs OAuth login for Kiro with Google.
 // This uses a custom protocol handler (kiro://) to receive the callback.
 func (a *KiroAuthenticator) LoginWithGoogle(ctx context.Context, cfg *config.Config, opts *LoginOptions) (*coreauth.Auth, error) {