fix: correct Feishu OAuth authentication and web download

Makefile

@@ -2,12 +2,23 @@
 HAS_UPX := $(shell command -v upx 2> /dev/null)
 
 .PHONY: build
-build:
+build:  ## Build for current platform (cross-compile support: linux-amd64, darwin-arm64)
 	go build -ldflags="-X main.version=v2-`git rev-parse --short HEAD`" -o ./feishu2md cmd/*.go
 ifneq ($(and $(COMPRESS),$(HAS_UPX)),)
 	upx -9 ./feishu2md
 endif
 
+.PHONY: build-linux-amd64
+build-linux-amd64:  ## Build for Linux AMD64
+	GOOS=linux GOARCH=amd64 go build -ldflags="-X main.version=v2-$$(git rev-parse --short HEAD)" -o ./feishu2md-linux-amd64 cmd/*.go
+
+.PHONY: build-darwin-arm64
+build-darwin-arm64:  ## Build for macOS ARM64
+	GOOS=darwin GOARCH=arm64 go build -ldflags="-X main.version=v2-$$(git rev-parse --short HEAD)" -o ./feishu2md-darwin-arm64 cmd/*.go
+
+.PHONY: build-all-platforms
+build-all-platforms: build build-linux-amd64 build-darwin-arm64  ## Build for all platforms
+
 .PHONY: test
 test:
 	go test ./...

cmd/download.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/88250/lute"
 	"github.com/Wsine/feishu2md/core"
@@ -25,6 +26,27 @@ type DownloadOpts struct {
 var dlOpts = DownloadOpts{}
 var dlConfig core.Config
 
+// isTokenExpired checks if the user token is expired
+func isTokenExpired(cfg *core.Config) bool {
+	if cfg.Feishu.TokenExpireTime == 0 {
+		return true
+	}
+	return time.Now().Unix() >= cfg.Feishu.TokenExpireTime
+}
+
+// loadConfigWithRefresh loads config and returns updated config if token was refreshed
+func loadConfigWithRefresh() (*core.Config, error) {
+	configPath, err := core.GetConfigFilePath()
+	if err != nil {
+		return nil, err
+	}
+	config, err := core.ReadConfigFromFile(configPath)
+	if err != nil {
+		return nil, err
+	}
+	return config, nil
+}
+
 func downloadDocument(ctx context.Context, client *core.Client, url string, opts *DownloadOpts) error {
 	// Validate the url to download
 	docType, docToken, err := utils.ValidateDocumentURL(url)
@@ -246,20 +268,28 @@ func downloadWiki(ctx context.Context, client *core.Client, url string) error {
 
 func handleDownloadCommand(url string) error {
 	// Load config
-	configPath, err := core.GetConfigFilePath()
-	if err != nil {
-		return err
-	}
-	config, err := core.ReadConfigFromFile(configPath)
+	config, err := loadConfigWithRefresh()
 	if err != nil {
 		return err
 	}
 	dlConfig = *config
 
-	// Instantiate the client
-	client := core.NewClient(
-		dlConfig.Feishu.AppId, dlConfig.Feishu.AppSecret,
-	)
+	// Create client based on token availability
+	var client *core.Client
+	if config.Feishu.UserAccessToken != "" && !isTokenExpired(config) {
+		client = core.NewClientWithUserToken(
+			config.Feishu.AppId,
+			config.Feishu.AppSecret,
+			config.Feishu.UserAccessToken,
+		)
+		fmt.Println("Using user identity for download")
+	} else {
+		client = core.NewClient(
+			config.Feishu.AppId,
+			config.Feishu.AppSecret,
+		)
+		fmt.Println("Using app identity for download")
+	}
 	ctx := context.Background()
 
 	if dlOpts.batch {

cmd/login.go

@@ -0,0 +1,203 @@
+package main
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"os/exec"
+	"runtime"
+	"time"
+
+	"github.com/Wsine/feishu2md/core"
+)
+
+type LoginOpts struct {
+	port int
+}
+
+var loginOpts = LoginOpts{port: 8088}
+
+func handleLoginCommand() error {
+	// 1. Load config to get app_id and app_secret
+	configPath, err := core.GetConfigFilePath()
+	if err != nil {
+		return fmt.Errorf("failed to get config path: %w", err)
+	}
+
+	cfg, err := core.ReadConfigFromFile(configPath)
+	if err != nil {
+		return fmt.Errorf("failed to read config: %w", err)
+	}
+
+	if cfg.Feishu.AppId == "" || cfg.Feishu.AppSecret == "" {
+		return fmt.Errorf("app_id and app_secret are required in config, please run 'feishu2md config --appId <id> --appSecret <secret>' first")
+	}
+
+	// 2. Generate PKCE
+	codeVerifier, codeChallenge, err := core.GeneratePKCE()
+	if err != nil {
+		return fmt.Errorf("failed to generate PKCE: %w", err)
+	}
+
+	// 3. Generate random state for CSRF protection
+	state, err := generateState()
+	if err != nil {
+		return fmt.Errorf("failed to generate state: %w", err)
+	}
+
+	// 4. Build auth URL
+	authURL := core.BuildAuthURL(cfg.Feishu.AppId, state, codeChallenge)
+
+	// 5. Display URL in terminal
+	fmt.Println("Please visit the following URL to login:")
+	fmt.Println(authURL)
+	fmt.Println()
+
+	// 6. Open browser (platform-specific)
+	if err := openBrowser(authURL); err != nil {
+		fmt.Printf("Failed to open browser: %v\n", err)
+		fmt.Println("Please manually open the URL above in your browser.")
+	}
+
+	// 7. Start callback server
+	fmt.Printf("Waiting for callback on http://127.0.0.1:%d/callback...\n", loginOpts.port)
+
+	done := make(chan error, 1)
+	go func() {
+		done <- startCallbackServer(loginOpts.port, codeVerifier, configPath, cfg, state)
+	}()
+
+	// Wait for callback or timeout
+	select {
+	case err := <-done:
+		if err != nil {
+			return err
+		}
+		fmt.Println("Login successful! Tokens have been saved to config.")
+		return nil
+	case <-time.After(5 * time.Minute):
+		return fmt.Errorf("login timed out after 5 minutes")
+	}
+}
+
+func startCallbackServer(port int, codeVerifier string, configPath string, cfg *core.Config, expectedState string) error {
+	mux := http.NewServeMux()
+
+	// Use a channel to signal callback completion with error
+	callbackDone := make(chan error, 1)
+
+	mux.HandleFunc("/callback", func(w http.ResponseWriter, r *http.Request) {
+		query := r.URL.Query()
+
+		// Check for error in callback
+		if errMsg := query.Get("error"); errMsg != "" {
+			callbackDone <- fmt.Errorf("oauth error: %s - %s", errMsg, query.Get("error_description"))
+			return
+		}
+
+		// Validate state
+		state := query.Get("state")
+		if state != expectedState {
+			callbackDone <- fmt.Errorf("state mismatch: expected %s, got %s", expectedState, state)
+			return
+		}
+
+		code := query.Get("code")
+		if code == "" {
+			callbackDone <- fmt.Errorf("no code received in callback")
+			return
+		}
+
+		// Exchange code for tokens
+		token, err := core.ExchangeCodeForToken(cfg.Feishu.AppId, cfg.Feishu.AppSecret, code, codeVerifier)
+		if err != nil {
+			callbackDone <- fmt.Errorf("failed to exchange code for token: %w", err)
+			return
+		}
+
+		// Update config with tokens
+		cfg.Feishu.UserAccessToken = token.AccessToken
+		cfg.Feishu.RefreshToken = token.RefreshToken
+		cfg.Feishu.TokenExpireTime = time.Now().Unix() + int64(token.ExpiresIn)
+
+		// Save config
+		if err := cfg.WriteConfig2File(configPath); err != nil {
+			callbackDone <- fmt.Errorf("failed to save config: %w", err)
+			return
+		}
+
+		// Signal success
+		callbackDone <- nil
+
+		// Return success HTML
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title>Login Successful</title>
+    <style>
+        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; background: #f5f5f5; }
+        .container { text-align: center; padding: 40px; background: white; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
+        h1 { color: #52c41a; margin-bottom: 10px; }
+        p { color: #666; }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>Login Successful!</h1>
+        <p>You can now close this window and use feishu2md commands.</p>
+    </div>
+</body>
+</html>`))
+	})
+
+	server := &http.Server{
+		Addr:    fmt.Sprintf("127.0.0.1:%d", port),
+		Handler: mux,
+	}
+
+	// Start server in goroutine
+	errChan := make(chan error, 1)
+	go func() {
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			errChan <- err
+		}
+	}()
+
+	// Wait for either callback completion or error
+	select {
+	case callbackErr := <-callbackDone:
+		server.Close()
+		return callbackErr
+	case err := <-errChan:
+		return fmt.Errorf("server error: %w", err)
+	}
+}
+
+func openBrowser(url string) error {
+	var cmd string
+
+	switch runtime.GOOS {
+	case "linux":
+		cmd = "xdg-open"
+	case "darwin":
+		cmd = "open"
+	case "windows":
+		cmd = "rundll32"
+	default:
+		return fmt.Errorf("unsupported platform: %s", runtime.GOOS)
+	}
+
+	return exec.Command(cmd, url).Start()
+}
+
+func generateState() (string, error) {
+	bytes := make([]byte, 16)
+	if _, err := rand.Read(bytes); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(bytes), nil
+}

cmd/main.go

@@ -82,6 +82,21 @@ func main() {
 					}
 				},
 			},
+			{
+				Name:  "login",
+				Usage: "Login to Feishu to enable user-level permissions",
+				Flags: []cli.Flag{
+					&cli.IntFlag{
+						Name:        "port",
+						Value:       8088,
+						Usage:       "Port for OAuth callback server",
+						Destination: &loginOpts.port,
+					},
+				},
+				Action: func(ctx *cli.Context) error {
+					return handleLoginCommand()
+				},
+			},
 		},
 	}