commit d3016b94db981a69138c690e644c55079ac39e54
Author: loveuer <loveuer@fn-dev.fn-dev>
Date:   Wed Sep 9 20:53:39 2026 -0700

    feat: implement ufile sharing service

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..031ae03
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+/ufile
+/data/
+/frontend/node_modules/
+/frontend/dist/
+*.db
+*.db-shm
+*.db-wal
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8203d67
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+.PHONY: build frontend test clean
+
+build: frontend
+	CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o ufile .
+
+frontend:
+	cd frontend && npm ci && npm run build
+
+test: frontend
+	go test ./...
+
+clean:
+	rm -f ufile
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4573d33
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+# ufile
+
+一个单二进制运行的轻量文件快传服务。支持多用户和三级权限、限时保存、限次访问、6 位取件码，以及无需登录的下载和预览链接。
+
+## 构建
+
+需要 Go 1.24+ 与 Node.js 20+：
+
+```bash
+./build.sh
+```
+
+也可以运行 `make build`。构建脚本会先安装并编译前端，再通过 `go:embed` 将产物写入最终的 `ufile` 二进制；SQLite 使用纯 Go 驱动，不依赖 CGO。
+
+## 运行
+
+```bash
+./ufile --data ./data --address 0.0.0.0:6616
+```
+
+参数：
+
+- `--data`：文件目录，默认 `./data`
+- `--db`：SQLite 文件路径；留空时为 `<data>/data.db`
+- `--address`：监听地址，默认 `0.0.0.0:6616`
+
+首次使用空数据库启动时，终端会输出 `admin` 的随机密码。该账号第一次登录后必须立即修改密码。
+
+## 分享链接
+
+- 下载：`/uf/<file_hash>`
+- 预览：`/uf/<file_hash>?preview=true`
+- 有取件码时追加：`code=<6位取件码>`
+
+预览也会消耗一次访问次数。文件过期、访问次数耗尽或所属用户被删除时，数据库记录和磁盘文件都会被清理。
diff --git a/app.go b/app.go
new file mode 100644
index 0000000..8f0dfcc
--- /dev/null
+++ b/app.go
@@ -0,0 +1,678 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"mime"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+)
+
+const sessionCookie = "ufile_session"
+
+var usernamePattern = regexp.MustCompile(`^[A-Za-z0-9_.-]{3,32}$`)
+var pickupCodePattern = regexp.MustCompile(`^[0-9]{6}$`)
+
+type App struct {
+	db         *gorm.DB
+	filesDir   string
+	web        fs.FS
+	uploadMu   sync.Mutex
+	downloadMu sync.Mutex
+	now        func() time.Time
+}
+
+func newApp(dbPath, dataDir string, web fs.FS) (*App, string, error) {
+	filesDir := filepath.Join(dataDir, "files")
+	if err := os.MkdirAll(filesDir, 0o750); err != nil {
+		return nil, "", fmt.Errorf("create data directory: %w", err)
+	}
+	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	if err != nil {
+		return nil, "", fmt.Errorf("open database: %w", err)
+	}
+	if err := db.AutoMigrate(&User{}, &Session{}, &SharedFile{}); err != nil {
+		return nil, "", fmt.Errorf("migrate database: %w", err)
+	}
+	app := &App{db: db, filesDir: filesDir, web: web, now: time.Now}
+	password, err := app.ensureAdmin()
+	return app, password, err
+}
+
+func (a *App) ensureAdmin() (string, error) {
+	var count int64
+	if err := a.db.Model(&User{}).Count(&count).Error; err != nil {
+		return "", err
+	}
+	if count != 0 {
+		return "", nil
+	}
+	password, err := randomToken(18)
+	if err != nil {
+		return "", err
+	}
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return "", err
+	}
+	admin := User{ID: 1, Username: "admin", PasswordHash: string(hash), CanManageUsers: true, CanUpload: true, CanAdvancedUpload: true, MustChangePassword: true}
+	if err := a.db.Create(&admin).Error; err != nil {
+		return "", err
+	}
+	return password, nil
+}
+
+func (a *App) router() *gin.Engine {
+	gin.SetMode(gin.ReleaseMode)
+	r := gin.New()
+	r.Use(gin.Logger(), gin.Recovery())
+	r.POST("/api/auth/login", a.login)
+	r.POST("/api/auth/logout", a.auth(false), a.logout)
+	r.GET("/api/auth/me", a.auth(false), a.me)
+	r.PUT("/api/auth/password", a.auth(false), a.changePassword)
+	r.POST("/api/files", a.auth(true), a.uploadFile)
+	r.GET("/api/users", a.auth(true), a.manageUsers, a.listUsers)
+	r.POST("/api/users", a.auth(true), a.manageUsers, a.createUser)
+	r.PUT("/api/users/:id", a.auth(true), a.manageUsers, a.updateUser)
+	r.POST("/api/users/:id/reset-password", a.auth(true), a.manageUsers, a.resetPassword)
+	r.DELETE("/api/users/:id", a.auth(true), a.manageUsers, a.deleteUser)
+	r.GET("/uf/:hash", a.downloadFile)
+	r.NoRoute(a.serveSPA)
+	return r
+}
+
+func (a *App) auth(requireChanged bool) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		token, err := c.Cookie(sessionCookie)
+		if err != nil || token == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+			return
+		}
+		var session Session
+		if err := a.db.Where("token_hash = ? AND expires_at > ?", tokenHash(token), a.now()).First(&session).Error; err != nil {
+			clearSessionCookie(c)
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "登录已过期"})
+			return
+		}
+		var user User
+		if err := a.db.First(&user, session.UserID).Error; err != nil {
+			clearSessionCookie(c)
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "用户不存在"})
+			return
+		}
+		if requireChanged && user.MustChangePassword {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "请先修改初始密码", "code": "PASSWORD_CHANGE_REQUIRED"})
+			return
+		}
+		c.Set("user", &user)
+		c.Set("session", &session)
+		c.Next()
+	}
+}
+
+func currentUser(c *gin.Context) *User { return c.MustGet("user").(*User) }
+
+func (a *App) manageUsers(c *gin.Context) {
+	if !currentUser(c).CanManageUsers {
+		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "没有用户管理权限"})
+		return
+	}
+	c.Next()
+}
+
+type loginRequest struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+func (a *App) login(c *gin.Context) {
+	var req loginRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求格式不正确"})
+		return
+	}
+	var user User
+	if err := a.db.Where("username = ?", req.Username).First(&user).Error; err != nil || bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(req.Password)) != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "用户名或密码错误"})
+		return
+	}
+	token, err := randomToken(32)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建会话失败"})
+		return
+	}
+	session := Session{TokenHash: tokenHash(token), UserID: user.ID, ExpiresAt: a.now().Add(30 * 24 * time.Hour)}
+	if err := a.db.Create(&session).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建会话失败"})
+		return
+	}
+	setSessionCookie(c, token, session.ExpiresAt)
+	c.JSON(http.StatusOK, user)
+}
+
+func (a *App) logout(c *gin.Context) {
+	session := c.MustGet("session").(*Session)
+	a.db.Delete(session)
+	clearSessionCookie(c)
+	c.Status(http.StatusNoContent)
+}
+
+func (a *App) me(c *gin.Context) { c.JSON(http.StatusOK, currentUser(c)) }
+
+func (a *App) changePassword(c *gin.Context) {
+	var req struct {
+		CurrentPassword string `json:"currentPassword"`
+		NewPassword     string `json:"newPassword"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil || len(req.NewPassword) < 8 || len(req.NewPassword) > 128 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "新密码长度需要为 8 到 128 位"})
+		return
+	}
+	user := currentUser(c)
+	if bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(req.CurrentPassword)) != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "当前密码错误"})
+		return
+	}
+	hash, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "修改密码失败"})
+		return
+	}
+	if err := a.db.Model(user).Updates(map[string]any{"password_hash": string(hash), "must_change_password": false}).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "修改密码失败"})
+		return
+	}
+	user.PasswordHash = string(hash)
+	user.MustChangePassword = false
+	c.JSON(http.StatusOK, user)
+}
+
+func setSessionCookie(c *gin.Context, token string, expires time.Time) {
+	http.SetCookie(c.Writer, &http.Cookie{Name: sessionCookie, Value: token, Path: "/", Expires: expires, MaxAge: int(time.Until(expires).Seconds()), HttpOnly: true, SameSite: http.SameSiteLaxMode})
+}
+
+func clearSessionCookie(c *gin.Context) {
+	http.SetCookie(c.Writer, &http.Cookie{Name: sessionCookie, Path: "/", MaxAge: -1, HttpOnly: true, SameSite: http.SameSiteLaxMode})
+}
+
+func tokenHash(token string) string {
+	sum := sha256.Sum256([]byte(token))
+	return hex.EncodeToString(sum[:])
+}
+
+func randomToken(bytes int) (string, error) {
+	b := make([]byte, bytes)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+func randomFileHash() (string, error) {
+	const alphabet = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
+	b := make([]byte, 8)
+	raw := make([]byte, 8)
+	if _, err := rand.Read(raw); err != nil {
+		return "", err
+	}
+	for i := range b {
+		b[i] = alphabet[int(raw[i])%len(alphabet)]
+	}
+	return string(b), nil
+}
+
+func parseRetention(value string, now time.Time) (*time.Time, bool) {
+	var duration time.Duration
+	switch value {
+	case "1h":
+		duration = time.Hour
+	case "8h":
+		duration = 8 * time.Hour
+	case "1d":
+		duration = 24 * time.Hour
+	case "3d":
+		duration = 72 * time.Hour
+	case "forever":
+		return nil, true
+	default:
+		return nil, false
+	}
+	t := now.Add(duration)
+	return &t, true
+}
+
+func parseDownloads(value string) (*int, bool) {
+	if value == "unlimited" {
+		return nil, true
+	}
+	n, err := strconv.Atoi(value)
+	if err != nil || n < 1 || n > 99 {
+		return nil, false
+	}
+	return &n, true
+}
+
+func (a *App) uploadFile(c *gin.Context) {
+	user := currentUser(c)
+	if !user.CanUpload && !user.CanAdvancedUpload {
+		c.JSON(http.StatusForbidden, gin.H{"error": "没有上传权限"})
+		return
+	}
+	expiresAt, ok := parseRetention(c.PostForm("retention"), a.now())
+	if !ok {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的保留时间"})
+		return
+	}
+	maxDownloads, ok := parseDownloads(c.PostForm("downloads"))
+	if !ok {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "下载次数需要为 1 到 99"})
+		return
+	}
+	if (expiresAt == nil || maxDownloads == nil) && !user.CanAdvancedUpload {
+		c.JSON(http.StatusForbidden, gin.H{"error": "永久保留和无限下载需要高级上传权限"})
+		return
+	}
+	pickupCode := c.PostForm("pickupCode")
+	if pickupCode != "" && !pickupCodePattern.MatchString(pickupCode) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "取件码必须是 6 位数字"})
+		return
+	}
+	header, err := c.FormFile("file")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择文件"})
+		return
+	}
+
+	a.uploadMu.Lock()
+	defer a.uploadMu.Unlock()
+	if !user.CanAdvancedUpload {
+		var count int64
+		if err := a.db.Model(&SharedFile{}).Where("owner_id = ? AND (expires_at IS NULL OR expires_at > ?)", user.ID, a.now()).Count(&count).Error; err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "检查上传限额失败"})
+			return
+		}
+		if count >= 10 {
+			c.JSON(http.StatusForbidden, gin.H{"error": "普通上传用户最多保留 10 个有效文件"})
+			return
+		}
+	}
+	var codeHash string
+	if pickupCode != "" {
+		hash, err := bcrypt.GenerateFromPassword([]byte(pickupCode), bcrypt.DefaultCost)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "处理取件码失败"})
+			return
+		}
+		codeHash = string(hash)
+	}
+	file := SharedFile{OriginalName: filepath.Base(header.Filename), MimeType: header.Header.Get("Content-Type"), OwnerID: user.ID, ExpiresAt: expiresAt, MaxDownloads: maxDownloads, PickupCodeHash: codeHash}
+	if file.MimeType == "" {
+		file.MimeType = "application/octet-stream"
+	}
+	for attempts := 0; attempts < 10; attempts++ {
+		file.ID = 0
+		file.Hash, err = randomFileHash()
+		if err != nil {
+			break
+		}
+		err = a.db.Create(&file).Error
+		if err == nil {
+			break
+		}
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建文件记录失败"})
+		return
+	}
+	src, err := header.Open()
+	if err != nil {
+		a.db.Delete(&file)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "读取上传文件失败"})
+		return
+	}
+	defer src.Close()
+	temp, err := os.CreateTemp(a.filesDir, ".upload-*")
+	if err != nil {
+		a.db.Delete(&file)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存文件失败"})
+		return
+	}
+	tempName := temp.Name()
+	defer os.Remove(tempName)
+	size, copyErr := io.Copy(temp, src)
+	closeErr := temp.Close()
+	finalPath := filepath.Join(a.filesDir, file.Hash)
+	if copyErr != nil || closeErr != nil || os.Rename(tempName, finalPath) != nil {
+		a.db.Delete(&file)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存文件失败"})
+		return
+	}
+	file.Size = size
+	file.Ready = true
+	if err := a.db.Model(&file).Updates(map[string]any{"size": size, "ready": true}).Error; err != nil {
+		os.Remove(finalPath)
+		a.db.Delete(&file)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存文件失败"})
+		return
+	}
+	c.JSON(http.StatusCreated, presentFile(file))
+}
+
+func (a *App) downloadFile(c *gin.Context) {
+	var file SharedFile
+	if err := a.db.Where("hash = ? AND ready = ?", c.Param("hash"), true).First(&file).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在或已失效"})
+		return
+	}
+	if file.ExpiresAt != nil && !file.ExpiresAt.After(a.now()) {
+		a.removeFile(file)
+		c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在或已失效"})
+		return
+	}
+	if file.PickupCodeHash != "" && bcrypt.CompareHashAndPassword([]byte(file.PickupCodeHash), []byte(c.Query("code"))) != nil {
+		c.JSON(http.StatusForbidden, gin.H{"error": "取件码错误"})
+		return
+	}
+	handle, err := os.Open(filepath.Join(a.filesDir, file.Hash))
+	if err != nil {
+		a.db.Delete(&file)
+		c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在或已失效"})
+		return
+	}
+	defer handle.Close()
+	removeAfter := false
+	if file.MaxDownloads != nil {
+		allowed, exhausted, err := a.consumeDownload(file)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "读取文件失败"})
+			return
+		}
+		if !allowed {
+			handle.Close()
+			a.removeFile(file)
+			c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在或已失效"})
+			return
+		}
+		removeAfter = exhausted
+	}
+	if removeAfter {
+		defer os.Remove(filepath.Join(a.filesDir, file.Hash))
+	}
+	c.Header("Content-Type", file.MimeType)
+	c.Header("Content-Length", strconv.FormatInt(file.Size, 10))
+	if c.Query("preview") != "true" {
+		c.Header("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": file.OriginalName}))
+	} else {
+		c.Header("Content-Disposition", "inline")
+		c.Header("Content-Security-Policy", "sandbox; default-src 'none'; img-src 'self' data:; media-src 'self'; style-src 'unsafe-inline'")
+	}
+	c.Header("X-Content-Type-Options", "nosniff")
+	c.Status(http.StatusOK)
+	_, _ = io.Copy(c.Writer, handle)
+}
+
+func (a *App) consumeDownload(file SharedFile) (allowed, exhausted bool, err error) {
+	a.downloadMu.Lock()
+	defer a.downloadMu.Unlock()
+	result := a.db.Model(&SharedFile{}).Where("id = ? AND download_count < ?", file.ID, *file.MaxDownloads).UpdateColumn("download_count", gorm.Expr("download_count + 1"))
+	if result.Error != nil {
+		return false, false, result.Error
+	}
+	if result.RowsAffected == 0 {
+		return false, false, nil
+	}
+	var latest SharedFile
+	if err := a.db.First(&latest, file.ID).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return true, false, nil
+		}
+		return false, false, err
+	}
+	if latest.DownloadCount < *file.MaxDownloads {
+		return true, false, nil
+	}
+	if err := a.db.Where("id = ? AND download_count >= ?", file.ID, *file.MaxDownloads).Delete(&SharedFile{}).Error; err != nil {
+		return false, false, err
+	}
+	return true, true, nil
+}
+
+func (a *App) removeFile(file SharedFile) {
+	a.db.Delete(&file)
+	_ = os.Remove(filepath.Join(a.filesDir, file.Hash))
+}
+
+func (a *App) cleanup() {
+	var files []SharedFile
+	now := a.now()
+	a.db.Where("(expires_at IS NOT NULL AND expires_at <= ?) OR (ready = ? AND created_at < ?)", now, false, now.Add(-time.Hour)).Find(&files)
+	for _, file := range files {
+		a.removeFile(file)
+	}
+	a.db.Where("expires_at <= ?", now).Delete(&Session{})
+	a.cleanupStorageOrphans(now)
+}
+
+func (a *App) cleanupStorageOrphans(now time.Time) {
+	entries, err := os.ReadDir(a.filesDir)
+	if err != nil {
+		return
+	}
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if strings.HasPrefix(entry.Name(), ".upload-") {
+			if info, err := entry.Info(); err == nil && info.ModTime().Before(now.Add(-time.Hour)) {
+				_ = os.Remove(filepath.Join(a.filesDir, entry.Name()))
+			}
+			continue
+		}
+		if len(entry.Name()) != 8 {
+			continue
+		}
+		var count int64
+		if err := a.db.Model(&SharedFile{}).Where("hash = ?", entry.Name()).Count(&count).Error; err == nil && count == 0 {
+			_ = os.Remove(filepath.Join(a.filesDir, entry.Name()))
+		}
+	}
+}
+
+func (a *App) runCleanup(ctx context.Context) {
+	a.cleanup()
+	ticker := time.NewTicker(time.Minute)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			a.cleanup()
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (a *App) serveSPA(c *gin.Context) {
+	if a.web == nil || strings.HasPrefix(c.Request.URL.Path, "/api/") {
+		c.JSON(http.StatusNotFound, gin.H{"error": "页面不存在"})
+		return
+	}
+	path := strings.TrimPrefix(filepath.Clean(c.Request.URL.Path), "/")
+	if path != "." {
+		if data, err := fs.ReadFile(a.web, path); err == nil {
+			if kind := mime.TypeByExtension(filepath.Ext(path)); kind != "" {
+				c.Header("Content-Type", kind)
+			}
+			c.Data(http.StatusOK, c.Writer.Header().Get("Content-Type"), data)
+			return
+		}
+	}
+	data, err := fs.ReadFile(a.web, "index.html")
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "页面不存在"})
+		return
+	}
+	c.Data(http.StatusOK, "text/html; charset=utf-8", data)
+}
+
+func parseUserID(c *gin.Context) (uint, bool) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的用户 ID"})
+		return 0, false
+	}
+	return uint(id), true
+}
+
+func (a *App) listUsers(c *gin.Context) {
+	var users []User
+	if err := a.db.Order("id").Find(&users).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "读取用户失败"})
+		return
+	}
+	c.JSON(http.StatusOK, users)
+}
+
+func (a *App) createUser(c *gin.Context) {
+	var req struct {
+		Username          string `json:"username"`
+		CanManageUsers    bool   `json:"canManageUsers"`
+		CanUpload         bool   `json:"canUpload"`
+		CanAdvancedUpload bool   `json:"canAdvancedUpload"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil || !usernamePattern.MatchString(req.Username) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "用户名需为 3 到 32 位字母、数字、点、横线或下划线"})
+		return
+	}
+	password, err := randomToken(12)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建用户失败"})
+		return
+	}
+	hash, _ := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	user := User{Username: req.Username, PasswordHash: string(hash), CanManageUsers: req.CanManageUsers, CanUpload: req.CanUpload, CanAdvancedUpload: req.CanAdvancedUpload, MustChangePassword: true}
+	if err := a.db.Create(&user).Error; err != nil {
+		if errors.Is(err, gorm.ErrDuplicatedKey) || strings.Contains(err.Error(), "UNIQUE") {
+			c.JSON(http.StatusConflict, gin.H{"error": "用户名已存在"})
+		} else {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "创建用户失败"})
+		}
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"user": user, "temporaryPassword": password})
+}
+
+func (a *App) updateUser(c *gin.Context) {
+	id, ok := parseUserID(c)
+	if !ok {
+		return
+	}
+	var req struct {
+		Username          string `json:"username"`
+		CanManageUsers    bool   `json:"canManageUsers"`
+		CanUpload         bool   `json:"canUpload"`
+		CanAdvancedUpload bool   `json:"canAdvancedUpload"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil || !usernamePattern.MatchString(req.Username) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "用户名需为 3 到 32 位字母、数字、点、横线或下划线"})
+		return
+	}
+	var user User
+	if err := a.db.First(&user, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "用户不存在"})
+		return
+	}
+	err := a.db.Model(&user).Updates(map[string]any{"username": req.Username, "can_manage_users": req.CanManageUsers, "can_upload": req.CanUpload, "can_advanced_upload": req.CanAdvancedUpload}).Error
+	if err != nil {
+		c.JSON(http.StatusConflict, gin.H{"error": "用户名已存在"})
+		return
+	}
+	a.db.First(&user, id)
+	c.JSON(http.StatusOK, user)
+}
+
+func (a *App) resetPassword(c *gin.Context) {
+	id, ok := parseUserID(c)
+	if !ok {
+		return
+	}
+	var user User
+	if err := a.db.First(&user, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "用户不存在"})
+		return
+	}
+	password, err := randomToken(12)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "重置密码失败"})
+		return
+	}
+	hash, _ := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err := a.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Model(&user).Updates(map[string]any{"password_hash": string(hash), "must_change_password": true}).Error; err != nil {
+			return err
+		}
+		return tx.Where("user_id = ?", id).Delete(&Session{}).Error
+	}); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "重置密码失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"temporaryPassword": password})
+}
+
+func (a *App) deleteUser(c *gin.Context) {
+	a.uploadMu.Lock()
+	defer a.uploadMu.Unlock()
+	id, ok := parseUserID(c)
+	if !ok {
+		return
+	}
+	if id == 1 {
+		c.JSON(http.StatusForbidden, gin.H{"error": "ID 为 1 的用户不能删除"})
+		return
+	}
+	var user User
+	if err := a.db.First(&user, id).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "用户不存在"})
+		return
+	}
+	var files []SharedFile
+	if err := a.db.Where("owner_id = ?", id).Find(&files).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除用户失败"})
+		return
+	}
+	err := a.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Where("user_id = ?", id).Delete(&Session{}).Error; err != nil {
+			return err
+		}
+		if err := tx.Where("owner_id = ?", id).Delete(&SharedFile{}).Error; err != nil {
+			return err
+		}
+		return tx.Delete(&user).Error
+	})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除用户失败"})
+		return
+	}
+	for _, file := range files {
+		_ = os.Remove(filepath.Join(a.filesDir, file.Hash))
+	}
+	c.Status(http.StatusNoContent)
+}
diff --git a/app_test.go b/app_test.go
new file mode 100644
index 0000000..9295860
--- /dev/null
+++ b/app_test.go
@@ -0,0 +1,311 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"testing/fstest"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func testApp(t *testing.T) (*App, string) {
+	t.Helper()
+	dir := t.TempDir()
+	web := fstest.MapFS{"index.html": &fstest.MapFile{Data: []byte("test")}}
+	app, password, err := newApp(filepath.Join(dir, "test.db"), dir, web)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return app, password
+}
+
+func request(t *testing.T, router http.Handler, method, path string, body io.Reader, contentType string, cookie *http.Cookie) *httptest.ResponseRecorder {
+	t.Helper()
+	req := httptest.NewRequest(method, path, body)
+	if contentType != "" {
+		req.Header.Set("Content-Type", contentType)
+	}
+	if cookie != nil {
+		req.AddCookie(cookie)
+	}
+	recorder := httptest.NewRecorder()
+	router.ServeHTTP(recorder, req)
+	return recorder
+}
+
+func loginAs(t *testing.T, router http.Handler, username, password string) *http.Cookie {
+	t.Helper()
+	body, _ := json.Marshal(map[string]string{"username": username, "password": password})
+	response := request(t, router, http.MethodPost, "/api/auth/login", bytes.NewReader(body), "application/json", nil)
+	if response.Code != http.StatusOK {
+		t.Fatalf("login status = %d, body = %s", response.Code, response.Body.String())
+	}
+	for _, cookie := range response.Result().Cookies() {
+		if cookie.Name == sessionCookie {
+			return cookie
+		}
+	}
+	t.Fatal("session cookie was not set")
+	return nil
+}
+
+func uploadBody(t *testing.T, fields map[string]string, name string, content []byte) (*bytes.Buffer, string) {
+	t.Helper()
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+	for key, value := range fields {
+		if err := writer.WriteField(key, value); err != nil {
+			t.Fatal(err)
+		}
+	}
+	part, err := writer.CreateFormFile("file", name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := part.Write(content); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	return body, writer.FormDataContentType()
+}
+
+func TestBootstrapAdminAndForcePasswordChange(t *testing.T) {
+	app, password := testApp(t)
+	if password == "" {
+		t.Fatal("initial password was not generated")
+	}
+	var admin User
+	if err := app.db.First(&admin, 1).Error; err != nil {
+		t.Fatal(err)
+	}
+	if admin.Username != "admin" || !admin.MustChangePassword || !admin.CanManageUsers || !admin.CanAdvancedUpload {
+		t.Fatalf("unexpected admin: %+v", admin)
+	}
+	if bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password)) != nil {
+		t.Fatal("generated password does not match")
+	}
+
+	router := app.router()
+	cookie := loginAs(t, router, "admin", password)
+	blocked := request(t, router, http.MethodPost, "/api/files", nil, "", cookie)
+	if blocked.Code != http.StatusForbidden || !strings.Contains(blocked.Body.String(), "PASSWORD_CHANGE_REQUIRED") {
+		t.Fatalf("forced password status = %d, body = %s", blocked.Code, blocked.Body.String())
+	}
+	body, _ := json.Marshal(map[string]string{"currentPassword": password, "newPassword": "new-password-123"})
+	changed := request(t, router, http.MethodPut, "/api/auth/password", bytes.NewReader(body), "application/json", cookie)
+	if changed.Code != http.StatusOK {
+		t.Fatalf("change password status = %d, body = %s", changed.Code, changed.Body.String())
+	}
+	if err := app.db.First(&admin, 1).Error; err != nil || admin.MustChangePassword {
+		t.Fatal("password change flag was not cleared")
+	}
+}
+
+func TestPickupCodePreviewConsumesFinalAccessAndDeletesFile(t *testing.T) {
+	app, _ := testApp(t)
+	hash, _ := bcrypt.GenerateFromPassword([]byte("password-123"), bcrypt.DefaultCost)
+	user := User{Username: "sender", PasswordHash: string(hash), CanAdvancedUpload: true}
+	if err := app.db.Create(&user).Error; err != nil {
+		t.Fatal(err)
+	}
+	router := app.router()
+	cookie := loginAs(t, router, user.Username, "password-123")
+	body, contentType := uploadBody(t, map[string]string{"retention": "1h", "downloads": "1", "pickupCode": "123456"}, "hello.txt", []byte("hello"))
+	uploaded := request(t, router, http.MethodPost, "/api/files", body, contentType, cookie)
+	if uploaded.Code != http.StatusCreated {
+		t.Fatalf("upload status = %d, body = %s", uploaded.Code, uploaded.Body.String())
+	}
+	var file fileResponse
+	if err := json.Unmarshal(uploaded.Body.Bytes(), &file); err != nil {
+		t.Fatal(err)
+	}
+
+	denied := request(t, router, http.MethodGet, "/uf/"+file.Hash, nil, "", nil)
+	if denied.Code != http.StatusForbidden {
+		t.Fatalf("missing code status = %d", denied.Code)
+	}
+	preview := request(t, router, http.MethodGet, "/uf/"+file.Hash+"?preview=true&code=123456", nil, "", nil)
+	if preview.Code != http.StatusOK || preview.Body.String() != "hello" {
+		t.Fatalf("preview status = %d, body = %s", preview.Code, preview.Body.String())
+	}
+	if disposition := preview.Header().Get("Content-Disposition"); disposition != "inline" {
+		t.Fatalf("disposition = %q", disposition)
+	}
+	var count int64
+	app.db.Model(&SharedFile{}).Where("hash = ?", file.Hash).Count(&count)
+	if count != 0 {
+		t.Fatal("file record remains after final access")
+	}
+	if _, err := os.Stat(filepath.Join(app.filesDir, file.Hash)); !os.IsNotExist(err) {
+		t.Fatal("stored file remains after final access")
+	}
+	again := request(t, router, http.MethodGet, "/uf/"+file.Hash+"?code=123456", nil, "", nil)
+	if again.Code != http.StatusNotFound {
+		t.Fatalf("second access status = %d", again.Code)
+	}
+}
+
+func TestFiniteDownloadCountDeletesAfterMoreThanOneAccess(t *testing.T) {
+	app, _ := testApp(t)
+	max := 3
+	file := SharedFile{Hash: "three123", OriginalName: "three.txt", MimeType: "text/plain", OwnerID: 1, MaxDownloads: &max, Ready: true, Size: 1}
+	if err := app.db.Create(&file).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(app.filesDir, file.Hash), []byte("x"), 0o640); err != nil {
+		t.Fatal(err)
+	}
+	router := app.router()
+	for i := 0; i < max; i++ {
+		response := request(t, router, http.MethodGet, "/uf/"+file.Hash, nil, "", nil)
+		if response.Code != http.StatusOK {
+			t.Fatalf("access %d status = %d", i+1, response.Code)
+		}
+	}
+	response := request(t, router, http.MethodGet, "/uf/"+file.Hash, nil, "", nil)
+	if response.Code != http.StatusNotFound {
+		t.Fatalf("access after limit status = %d", response.Code)
+	}
+	if _, err := os.Stat(filepath.Join(app.filesDir, file.Hash)); !os.IsNotExist(err) {
+		t.Fatal("file remains after third access")
+	}
+}
+
+func TestConcurrentAccessCannotExceedDownloadLimit(t *testing.T) {
+	app, _ := testApp(t)
+	max := 5
+	file := SharedFile{Hash: "parallel", OriginalName: "parallel.txt", MimeType: "text/plain", OwnerID: 1, MaxDownloads: &max, Ready: true, Size: 1}
+	if err := app.db.Create(&file).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(app.filesDir, file.Hash), []byte("x"), 0o640); err != nil {
+		t.Fatal(err)
+	}
+	router := app.router()
+	statuses := make(chan int, 20)
+	var group sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		group.Add(1)
+		go func() {
+			defer group.Done()
+			statuses <- request(t, router, http.MethodGet, "/uf/"+file.Hash, nil, "", nil).Code
+		}()
+	}
+	group.Wait()
+	close(statuses)
+	successes := 0
+	for status := range statuses {
+		if status == http.StatusOK {
+			successes++
+		}
+	}
+	if successes != max {
+		t.Fatalf("successful accesses = %d, want %d", successes, max)
+	}
+}
+
+func TestCleanupRemovesExpiredFileFromDatabaseAndDisk(t *testing.T) {
+	app, _ := testApp(t)
+	expired := time.Now().Add(-time.Minute)
+	max := 10
+	file := SharedFile{Hash: "expired1", OriginalName: "expired.txt", MimeType: "text/plain", OwnerID: 1, ExpiresAt: &expired, MaxDownloads: &max, Ready: true, Size: 1}
+	if err := app.db.Create(&file).Error; err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(app.filesDir, file.Hash)
+	if err := os.WriteFile(path, []byte("x"), 0o640); err != nil {
+		t.Fatal(err)
+	}
+	app.cleanup()
+	var count int64
+	app.db.Model(&SharedFile{}).Where("id = ?", file.ID).Count(&count)
+	if count != 0 {
+		t.Fatal("expired database record remains")
+	}
+	if _, err := os.Stat(path); !os.IsNotExist(err) {
+		t.Fatal("expired file remains on disk")
+	}
+}
+
+func TestBasicUploadLimitAndAdvancedInheritance(t *testing.T) {
+	app, _ := testApp(t)
+	passwordHash, _ := bcrypt.GenerateFromPassword([]byte("password-123"), bcrypt.DefaultCost)
+	basic := User{Username: "basic", PasswordHash: string(passwordHash), CanUpload: true}
+	if err := app.db.Create(&basic).Error; err != nil {
+		t.Fatal(err)
+	}
+	expires := time.Now().Add(time.Hour)
+	max := 1
+	for i := 0; i < 10; i++ {
+		file := SharedFile{Hash: "A" + strings.Repeat("0", 6) + string(rune('0'+i)), OriginalName: "x", MimeType: "text/plain", OwnerID: basic.ID, ExpiresAt: &expires, MaxDownloads: &max, Ready: true}
+		if err := app.db.Create(&file).Error; err != nil {
+			t.Fatal(err)
+		}
+	}
+	router := app.router()
+	cookie := loginAs(t, router, basic.Username, "password-123")
+	body, contentType := uploadBody(t, map[string]string{"retention": "1h", "downloads": "1"}, "blocked.txt", []byte("x"))
+	response := request(t, router, http.MethodPost, "/api/files", body, contentType, cookie)
+	if response.Code != http.StatusForbidden || !strings.Contains(response.Body.String(), "10") {
+		t.Fatalf("limit status = %d, body = %s", response.Code, response.Body.String())
+	}
+
+	advanced := User{Username: "advanced", PasswordHash: string(passwordHash), CanAdvancedUpload: true}
+	if err := app.db.Create(&advanced).Error; err != nil {
+		t.Fatal(err)
+	}
+	cookie = loginAs(t, router, advanced.Username, "password-123")
+	body, contentType = uploadBody(t, map[string]string{"retention": "forever", "downloads": "unlimited"}, "advanced.txt", []byte("x"))
+	response = request(t, router, http.MethodPost, "/api/files", body, contentType, cookie)
+	if response.Code != http.StatusCreated {
+		t.Fatalf("advanced upload status = %d, body = %s", response.Code, response.Body.String())
+	}
+}
+
+func TestDeleteUserRemovesOwnedFilesAndProtectsIDOne(t *testing.T) {
+	app, password := testApp(t)
+	var admin User
+	app.db.First(&admin, 1)
+	app.db.Model(&admin).Update("must_change_password", false)
+	user := User{Username: "doomed", PasswordHash: admin.PasswordHash}
+	if err := app.db.Create(&user).Error; err != nil {
+		t.Fatal(err)
+	}
+	file := SharedFile{Hash: "deadfile", OriginalName: "x", MimeType: "text/plain", OwnerID: user.ID, Ready: true}
+	if err := app.db.Create(&file).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(app.filesDir, file.Hash), []byte("x"), 0o640); err != nil {
+		t.Fatal(err)
+	}
+	router := app.router()
+	cookie := loginAs(t, router, "admin", password)
+	protected := request(t, router, http.MethodDelete, "/api/users/1", nil, "", cookie)
+	if protected.Code != http.StatusForbidden {
+		t.Fatalf("delete admin status = %d", protected.Code)
+	}
+	deleted := request(t, router, http.MethodDelete, "/api/users/"+jsonNumber(user.ID), nil, "", cookie)
+	if deleted.Code != http.StatusNoContent {
+		t.Fatalf("delete user status = %d, body = %s", deleted.Code, deleted.Body.String())
+	}
+	if _, err := os.Stat(filepath.Join(app.filesDir, file.Hash)); !os.IsNotExist(err) {
+		t.Fatal("owned file remains")
+	}
+}
+
+func jsonNumber(id uint) string {
+	data, _ := json.Marshal(id)
+	return string(data)
+}
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..cbca7ee
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+set -eu
+
+cd "$(dirname "$0")/frontend"
+npm ci
+npm run build
+cd ..
+CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o ufile .
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 0000000..da07e2b
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#f6f7f2" />
+    <title>ufile · 文件共享中心</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.jsx"></script>
+  </body>
+</html>
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..b12ef9c
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,2363 @@
+{
+  "name": "ufile-web",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "ufile-web",
+      "version": "1.0.0",
+      "dependencies": {
+        "@tailwindcss/vite": "^4.1.13",
+        "@vitejs/plugin-react": "^5.0.2",
+        "lucide-react": "^0.542.0",
+        "react": "^19.1.1",
+        "react-dom": "^19.1.1",
+        "tailwindcss": "^4.1.13",
+        "vite": "^7.1.4",
+        "zustand": "^5.0.8"
+      },
+      "devDependencies": {}
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmmirror.com/@babel/code-frame/-/code-frame-7.29.7.tgz",
+      "integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.29.7",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.1.1"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/compat-data": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmmirror.com/@babel/compat-data/-/compat-data-7.29.7.tgz",
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+        "@rollup/rollup-linux-x64-musl": "4.63.1",
+        "@rollup/rollup-openbsd-x64": "4.63.1",
+        "@rollup/rollup-openharmony-arm64": "4.63.1",
+        "@rollup/rollup-win32-arm64-msvc": "4.63.1",
+        "@rollup/rollup-win32-ia32-msvc": "4.63.1",
+        "@rollup/rollup-win32-x64-gnu": "4.63.1",
+        "@rollup/rollup-win32-x64-msvc": "4.63.1",
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+      }
+    },
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+      "resolved": "https://registry.npmmirror.com/scheduler/-/scheduler-0.28.0.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmmirror.com/semver/-/semver-6.3.1.tgz",
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+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
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+      "license": "BSD-3-Clause",
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+    },
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+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
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+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
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+        "node": ">=12.0.0"
+      },
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+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
+    "node_modules/update-browserslist-db": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmmirror.com/update-browserslist-db/-/update-browserslist-db-1.3.2.tgz",
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+          "url": "https://opencollective.com/browserslist"
+        },
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+          "url": "https://tidelift.com/funding/github/npm/browserslist"
+        },
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+          "url": "https://github.com/sponsors/ai"
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+        "escalade": "^3.2.0",
+        "picocolors": "^1.1.1"
+      },
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+        "update-browserslist-db": "cli.js"
+      },
+      "peerDependencies": {
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+      }
+    },
+    "node_modules/vite": {
+      "version": "7.3.6",
+      "resolved": "https://registry.npmmirror.com/vite/-/vite-7.3.6.tgz",
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+        "esbuild": "^0.27.0 || ^0.28.0",
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3",
+        "postcss": "^8.5.6",
+        "rollup": "^4.43.0",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "lightningcss": "^1.21.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
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+          "optional": true
+        },
+        "jiti": {
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+        },
+        "less": {
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+        },
+        "lightningcss": {
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+        },
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+        },
+        "sass-embedded": {
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+        },
+        "stylus": {
+          "optional": true
+        },
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+        },
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+        "yaml": {
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+        }
+      }
+    },
+    "node_modules/yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmmirror.com/yallist/-/yallist-3.1.1.tgz",
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+      "license": "ISC"
+    },
+    "node_modules/zustand": {
+      "version": "5.0.15",
+      "resolved": "https://registry.npmmirror.com/zustand/-/zustand-5.0.15.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      },
+      "peerDependencies": {
+        "@types/react": ">=18.0.0",
+        "immer": ">=9.0.6",
+        "react": ">=18.0.0",
+        "use-sync-external-store": ">=1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "immer": {
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+        },
+        "react": {
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+        },
+        "use-sync-external-store": {
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+        }
+      }
+    }
+  }
+}
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..0c661af
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "ufile-web",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build"
+  },
+  "dependencies": {
+    "@tailwindcss/vite": "^4.1.13",
+    "@vitejs/plugin-react": "^5.0.2",
+    "lucide-react": "^0.542.0",
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1",
+    "tailwindcss": "^4.1.13",
+    "vite": "^7.1.4",
+    "zustand": "^5.0.8"
+  },
+  "devDependencies": {}
+}
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
new file mode 100644
index 0000000..c13df09
--- /dev/null
+++ b/frontend/src/App.jsx
@@ -0,0 +1,203 @@
+import { useEffect, useState } from 'react'
+import {
+  ArrowDownToLine, Check, Copy, Eye, FileArchive, FileUp,
+  KeyRound, LoaderCircle, LogOut, ShieldCheck,
+  UploadCloud, Users, X,
+} from 'lucide-react'
+import { api, json } from './api'
+import { useAppStore } from './store'
+
+const formatBytes = (bytes) => {
+  if (bytes < 1024) return `${bytes} B`
+  const units = ['KB', 'MB', 'GB', 'TB']
+  let value = bytes / 1024
+  let unit = 0
+  while (value >= 1024 && unit < units.length - 1) { value /= 1024; unit++ }
+  return `${value.toFixed(value >= 10 ? 1 : 2)} ${units[unit]}`
+}
+
+const formatDate = (value) => value ? new Intl.DateTimeFormat('zh-CN', {
+  month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit',
+}).format(new Date(value)) : '永久'
+
+function Toast({ message, onClose }) {
+  useEffect(() => { const timer = setTimeout(onClose, 3600); return () => clearTimeout(timer) }, [message, onClose])
+  return <div className="fixed bottom-5 left-1/2 z-50 flex -translate-x-1/2 items-center gap-2 rounded-xl bg-ink px-4 py-3 text-sm text-white shadow-xl"><Check size={16} />{message}</div>
+}
+
+function Login() {
+  const login = useAppStore((s) => s.login)
+  const [form, setForm] = useState({ username: '', password: '' })
+  const [error, setError] = useState('')
+  const [busy, setBusy] = useState(false)
+  const [pickup, setPickup] = useState({ hash: '', code: '' })
+  const retrieve = (preview = false) => {
+    const hash = pickup.hash.trim()
+    if (!hash) return
+    const query = new URLSearchParams()
+    if (pickup.code) query.set('code', pickup.code)
+    if (preview) query.set('preview', 'true')
+    window.open(`/uf/${encodeURIComponent(hash)}${query.size ? `?${query}` : ''}`, '_blank')
+  }
+  const submit = async (event) => {
+    event.preventDefault(); setBusy(true); setError('')
+    try { await login(form.username, form.password) }
+    catch (e) { setError(e.message) }
+    finally { setBusy(false) }
+  }
+  return <main className="noise min-h-screen px-5 py-8 lg:grid lg:grid-cols-[1.08fr_.92fr] lg:items-center lg:px-[8vw]">
+    <section className="mx-auto max-w-2xl py-8 lg:mx-0">
+      <div className="mb-12 flex items-center gap-3"><div className="grid size-11 place-items-center rounded-2xl bg-leaf text-white"><FileArchive size={23} /></div><div><p className="text-xl font-semibold tracking-tight">ufile</p><p className="text-xs text-ink/45">轻量文件共享中心</p></div></div>
+      <p className="mb-4 text-sm font-medium uppercase tracking-[.24em] text-leaf">Send less. Share better.</p>
+      <h1 className="max-w-xl text-5xl font-semibold leading-[1.08] tracking-[-.045em] sm:text-6xl">把文件交给链接，<br />把空间留给重要的事。</h1>
+      <p className="mt-6 max-w-lg text-base leading-7 text-ink/55">限时保存、下载次数与取件码，让每一次分享都清晰可控。</p>
+      <div className="card mt-10 max-w-lg p-5">
+        <div className="mb-3 flex items-center gap-2 text-sm font-semibold"><ArrowDownToLine size={17} className="text-leaf" />收到分享？直接取件</div>
+        <div className="grid gap-2 sm:grid-cols-[1fr_130px_auto]">
+          <input className="field" maxLength={8} placeholder="8 位文件码" value={pickup.hash} onChange={(e) => setPickup({ ...pickup, hash: e.target.value })} />
+          <input className="field" inputMode="numeric" maxLength={6} placeholder="取件码（可选）" value={pickup.code} onChange={(e) => setPickup({ ...pickup, code: e.target.value.replace(/\D/g, '') })} />
+          <button className="btn-secondary" onClick={() => retrieve(false)}>下载</button>
+        </div>
+      </div>
+    </section>
+    <section className="mx-auto w-full max-w-md py-8 lg:justify-self-end">
+      <form className="card p-7 sm:p-9" onSubmit={submit}>
+        <div className="mb-8"><div className="mb-4 grid size-10 place-items-center rounded-xl bg-mint text-leaf"><KeyRound size={20} /></div><h2 className="text-2xl font-semibold tracking-tight">登录管理空间</h2><p className="mt-1.5 text-sm text-ink/50">上传文件或管理系统用户</p></div>
+        <label className="label">用户名</label><input autoFocus className="field mb-4" required value={form.username} onChange={(e) => setForm({ ...form, username: e.target.value })} />
+        <label className="label">密码</label><input className="field" type="password" required value={form.password} onChange={(e) => setForm({ ...form, password: e.target.value })} />
+        {error && <p className="mt-3 text-sm text-red-600">{error}</p>}
+        <button className="btn-primary mt-6 w-full" disabled={busy}>{busy ? <LoaderCircle className="animate-spin" size={18} /> : '登录'}</button>
+      </form>
+    </section>
+  </main>
+}
+
+function ChangePassword() {
+  const user = useAppStore((s) => s.user)
+  const setUser = useAppStore((s) => s.setUser)
+  const logout = useAppStore((s) => s.logout)
+  const [form, setForm] = useState({ currentPassword: '', newPassword: '', confirm: '' })
+  const [error, setError] = useState('')
+  const submit = async (e) => {
+    e.preventDefault(); setError('')
+    if (form.newPassword !== form.confirm) return setError('两次输入的新密码不一致')
+    try { setUser(await api('/api/auth/password', json('PUT', form))) }
+    catch (err) { setError(err.message) }
+  }
+  return <main className="noise grid min-h-screen place-items-center px-5"><form onSubmit={submit} className="card w-full max-w-md p-8">
+    <div className="mb-5 grid size-12 place-items-center rounded-2xl bg-amber-100 text-amber-700"><KeyRound /></div>
+    <h1 className="text-2xl font-semibold">先设置你的新密码</h1><p className="mt-2 text-sm leading-6 text-ink/55">你好，{user.username}。临时密码只能用于首次登录，新密码至少 8 位。</p>
+    <label className="label mt-7">当前临时密码</label><input className="field" type="password" required value={form.currentPassword} onChange={(e) => setForm({ ...form, currentPassword: e.target.value })} />
+    <label className="label mt-4">新密码</label><input className="field" type="password" minLength={8} required value={form.newPassword} onChange={(e) => setForm({ ...form, newPassword: e.target.value })} />
+    <label className="label mt-4">再次输入新密码</label><input className="field" type="password" minLength={8} required value={form.confirm} onChange={(e) => setForm({ ...form, confirm: e.target.value })} />
+    {error && <p className="mt-3 text-sm text-red-600">{error}</p>}<button className="btn-primary mt-6 w-full">完成设置</button><button type="button" className="mt-3 w-full py-2 text-sm text-ink/45 hover:text-ink" onClick={logout}>退出登录</button>
+  </form></main>
+}
+
+function UploadPanel() {
+  const user = useAppStore((s) => s.user)
+  const [file, setFile] = useState(null)
+  const [retention, setRetention] = useState('1d')
+  const [downloads, setDownloads] = useState('5')
+  const [customDownloads, setCustomDownloads] = useState('20')
+  const [pickupCode, setPickupCode] = useState('')
+  const [busy, setBusy] = useState(false)
+  const [error, setError] = useState('')
+  const [result, setResult] = useState(null)
+  const allowed = user.canUpload || user.canAdvancedUpload
+  const submit = async (event) => {
+    event.preventDefault(); if (!file) return
+    setBusy(true); setError('')
+    const data = new FormData(); data.set('file', file); data.set('retention', retention)
+    data.set('downloads', downloads === 'custom' ? customDownloads : downloads); data.set('pickupCode', pickupCode)
+    try { const uploaded = await api('/api/files', { method: 'POST', body: data }); setResult({ ...uploaded, pickupCode }); setFile(null) }
+    catch (e) { setError(e.message) }
+    finally { setBusy(false) }
+  }
+  if (!allowed) return <div className="card p-8 text-center"><ShieldCheck className="mx-auto mb-3 text-ink/25" size={32} /><h2 className="font-semibold">当前账号没有上传权限</h2><p className="mt-1 text-sm text-ink/50">请联系用户管理员调整权限。</p></div>
+  if (result) return <UploadResult file={result} onAgain={() => { setResult(null); setPickupCode('') }} />
+  return <form className="card p-5 sm:p-6" onSubmit={submit}>
+    <div className="mb-5 flex items-start justify-between"><div><h2 className="text-lg font-semibold">上传新文件</h2><p className="mt-1 text-sm text-ink/45">{user.canAdvancedUpload ? '高级上传 · 不限有效文件数量' : '普通上传 · 最多 10 个有效文件'}</p></div><UploadCloud className="text-leaf" /></div>
+    <label className="group grid min-h-36 cursor-pointer place-items-center rounded-2xl border border-dashed border-ink/20 bg-paper/60 p-5 text-center transition hover:border-leaf/50 hover:bg-mint/25">
+      <input className="hidden" type="file" onChange={(e) => setFile(e.target.files[0] || null)} />
+      <div><FileUp className="mx-auto mb-3 text-leaf" /><p className="max-w-sm truncate font-medium">{file ? file.name : '点击选择文件'}</p><p className="mt-1 text-xs text-ink/40">{file ? formatBytes(file.size) : '文件大小取决于服务器可用空间'}</p></div>
+    </label>
+    <div className="mt-5 grid gap-4 sm:grid-cols-2">
+      <div><label className="label">保留时间</label><select className="field" value={retention} onChange={(e) => setRetention(e.target.value)}><option value="1h">1 小时</option><option value="8h">8 小时</option><option value="1d">1 天</option><option value="3d">3 天</option>{user.canAdvancedUpload && <option value="forever">永久</option>}</select></div>
+      <div><label className="label">可访问次数</label><select className="field" value={downloads} onChange={(e) => setDownloads(e.target.value)}><option value="1">1 次</option><option value="3">3 次</option><option value="5">5 次</option><option value="10">10 次</option><option value="custom">自定义</option>{user.canAdvancedUpload && <option value="unlimited">无限</option>}</select></div>
+      {downloads === 'custom' && <div><label className="label">自定义次数（1–99）</label><input className="field" type="number" min="1" max="99" required value={customDownloads} onChange={(e) => setCustomDownloads(e.target.value)} /></div>}
+      <div className={downloads === 'custom' ? '' : 'sm:col-span-2'}><label className="label">6 位数字取件码（可选）</label><input className="field" inputMode="numeric" pattern="[0-9]{6}" maxLength={6} placeholder="留空则无需取件码" value={pickupCode} onChange={(e) => setPickupCode(e.target.value.replace(/\D/g, ''))} /></div>
+    </div>
+    {error && <p className="mt-4 text-sm text-red-600">{error}</p>}
+    <button className="btn-primary mt-5 w-full" disabled={!file || busy}>{busy ? <><LoaderCircle className="animate-spin" size={18} />正在上传</> : <><UploadCloud size={18} />上传并生成链接</>}</button>
+  </form>
+}
+
+function UploadResult({ file, onAgain }) {
+  const [copied, setCopied] = useState('')
+  const query = new URLSearchParams()
+  if (file.pickupCode) query.set('code', file.pickupCode)
+  const download = `${location.origin}/uf/${file.hash}${query.size ? `?${query}` : ''}`
+  query.set('preview', 'true')
+  const preview = `${location.origin}/uf/${file.hash}?${query}`
+  const copy = async (value, type) => { await navigator.clipboard.writeText(value); setCopied(type); setTimeout(() => setCopied(''), 1800) }
+  const row = (title, value, type, icon) => <div><label className="label">{title}</label><div className="flex gap-2"><div className="field min-w-0 flex-1 truncate font-mono text-sm">{value}</div><button className="btn-secondary shrink-0 !px-3" onClick={() => copy(value, type)}>{copied === type ? <Check size={17} /> : icon}</button></div></div>
+  return <section className="card mx-auto w-full max-w-2xl p-6 sm:p-8">
+    <div className="mb-7 flex items-start gap-4"><div className="grid size-12 shrink-0 place-items-center rounded-2xl bg-mint text-leaf"><Check size={24} /></div><div className="min-w-0"><h2 className="text-xl font-semibold">文件已准备好</h2><p className="mt-1 truncate text-sm text-ink/50">{file.name} · {formatBytes(file.size)}</p></div></div>
+    <div className="space-y-4">{row('文件码', file.hash, 'hash', <Copy size={17} />)}{row('下载链接', download, 'download', <Copy size={17} />)}{row('预览链接', preview, 'preview', <Eye size={17} />)}{file.pickupCode && row('取件码', file.pickupCode, 'code', <Copy size={17} />)}</div>
+    <div className="mt-5 rounded-xl bg-paper p-4 text-sm text-ink/55">有效期：{formatDate(file.expiresAt)} · 访问次数：{file.maxDownloads == null ? '无限' : `${file.maxDownloads} 次`} {file.pickupCode && '· 链接已包含取件码，可按需分开发送'}</div>
+    <button className="btn-primary mt-6 w-full" onClick={onAgain}><UploadCloud size={18} />继续上传</button>
+  </section>
+}
+
+const emptyUser = { username: '', canManageUsers: false, canUpload: true, canAdvancedUpload: false }
+
+function UserModal({ value, onClose, onSaved }) {
+  const [form, setForm] = useState(value || emptyUser)
+  const [error, setError] = useState('')
+  const submit = async (e) => {
+    e.preventDefault(); setError('')
+    try { onSaved(await api(value ? `/api/users/${value.id}` : '/api/users', json(value ? 'PUT' : 'POST', form))) }
+    catch (err) { setError(err.message) }
+  }
+  const checkbox = (key, title, hint) => <label className="flex cursor-pointer gap-3 rounded-xl border border-line p-3.5"><input className="mt-1 size-4 accent-leaf" type="checkbox" checked={form[key]} onChange={(e) => setForm({ ...form, [key]: e.target.checked })} /><span><span className="block text-sm font-medium">{title}</span><span className="mt-0.5 block text-xs text-ink/45">{hint}</span></span></label>
+  return <div className="fixed inset-0 z-40 grid place-items-center bg-ink/30 p-5 backdrop-blur-sm"><form onSubmit={submit} className="card w-full max-w-md p-6"><div className="flex items-center justify-between"><h2 className="text-lg font-semibold">{value ? '编辑用户' : '创建用户'}</h2><button type="button" onClick={onClose}><X size={20} /></button></div><label className="label mt-5">用户名</label><input className="field" required pattern="[A-Za-z0-9_.-]{3,32}" value={form.username} onChange={(e) => setForm({ ...form, username: e.target.value })} /><div className="mt-4 space-y-2">{checkbox('canManageUsers', '用户管理', '创建、编辑、重置或删除用户')}{checkbox('canUpload', '普通上传', '最多保留 10 个有效文件')}{checkbox('canAdvancedUpload', '高级上传', '涵盖普通上传，并允许永久、无限下载')}</div>{error && <p className="mt-3 text-sm text-red-600">{error}</p>}<div className="mt-6 flex justify-end gap-2"><button type="button" className="btn-secondary" onClick={onClose}>取消</button><button className="btn-primary">保存</button></div></form></div>
+}
+
+function UsersPanel({ notify }) {
+  const users = useAppStore((s) => s.users)
+  const loadUsers = useAppStore((s) => s.loadUsers)
+  const [editing, setEditing] = useState(undefined)
+  const [modalOpen, setModalOpen] = useState(false)
+  const [secret, setSecret] = useState(null)
+  useEffect(() => { loadUsers() }, [loadUsers])
+  const saved = async (result) => { setModalOpen(false); setEditing(undefined); await loadUsers(); if (result.temporaryPassword) setSecret({ title: '用户已创建', password: result.temporaryPassword }); else notify('用户信息已保存') }
+  const reset = async (user) => { if (!confirm(`重置 ${user.username} 的密码并注销其所有会话？`)) return; const result = await api(`/api/users/${user.id}/reset-password`, { method: 'POST' }); setSecret({ title: `${user.username} 的临时密码`, password: result.temporaryPassword }) }
+  const remove = async (user) => { if (!confirm(`删除 ${user.username} 及其全部文件？此操作不可撤销。`)) return; await api(`/api/users/${user.id}`, { method: 'DELETE' }); await loadUsers(); notify('用户及其文件已删除') }
+  return <section className="card overflow-hidden"><div className="flex items-center justify-between border-b border-line px-5 py-4"><div><h2 className="font-semibold">用户管理</h2><p className="mt-0.5 text-xs text-ink/40">权限修改立即生效</p></div><button className="btn-primary !py-2 text-sm" onClick={() => { setEditing(undefined); setModalOpen(true) }}>创建用户</button></div><div className="divide-y divide-line">{users.map((user) => <div key={user.id} className="flex flex-col gap-3 p-5 sm:flex-row sm:items-center"><div className="grid size-10 shrink-0 place-items-center rounded-full bg-paper font-semibold text-leaf">{user.username.slice(0, 1).toUpperCase()}</div><div className="min-w-0 flex-1"><div className="flex items-center gap-2"><p className="font-medium">{user.username}</p><span className="text-xs text-ink/35">#{user.id}</span>{user.mustChangePassword && <span className="rounded-full bg-amber-100 px-2 py-0.5 text-[11px] text-amber-700">待改密</span>}</div><p className="mt-1 text-xs text-ink/45">{[user.canManageUsers && '用户管理', user.canUpload && '普通上传', user.canAdvancedUpload && '高级上传'].filter(Boolean).join(' · ') || '无权限'}</p></div><div className="flex gap-2"><button className="btn-secondary !px-3 !py-2 text-xs" onClick={() => { setEditing(user); setModalOpen(true) }}>编辑</button><button className="btn-secondary !px-3 !py-2 text-xs" onClick={() => reset(user)}>重置密码</button>{user.id !== 1 && <button className="rounded-xl px-3 py-2 text-xs font-medium text-red-600 hover:bg-red-50" onClick={() => remove(user)}>删除</button>}</div></div>)}</div>
+    {modalOpen && <UserModal value={editing} onClose={() => setModalOpen(false)} onSaved={saved} />}
+    {secret && <div className="fixed inset-0 z-50 grid place-items-center bg-ink/30 p-5 backdrop-blur-sm"><div className="card w-full max-w-md p-7"><h2 className="text-lg font-semibold">{secret.title}</h2><p className="mt-2 text-sm text-ink/50">该密码只显示这一次，用户登录后必须修改。</p><div className="mt-5 flex items-center justify-between rounded-xl bg-paper p-4 font-mono text-sm"><span className="break-all">{secret.password}</span><button onClick={() => navigator.clipboard.writeText(secret.password)}><Copy size={17} /></button></div><button className="btn-primary mt-5 w-full" onClick={() => setSecret(null)}>我已保存</button></div></div>}
+  </section>
+}
+
+function Dashboard() {
+  const user = useAppStore((s) => s.user)
+  const logout = useAppStore((s) => s.logout)
+  const [tab, setTab] = useState('files')
+  const [toast, setToast] = useState('')
+  const notify = (message) => setToast(message)
+  return <div className="noise min-h-screen"><header className="sticky top-0 z-20 border-b border-line/80 bg-paper/90 backdrop-blur-xl"><div className="mx-auto flex max-w-6xl items-center justify-between px-5 py-3.5"><div className="flex items-center gap-2.5"><div className="grid size-9 place-items-center rounded-xl bg-leaf text-white"><FileArchive size={19} /></div><span className="font-semibold">ufile</span></div><div className="flex items-center gap-3"><span className="hidden text-sm text-ink/50 sm:block">{user.username}</span><button className="btn-secondary !p-2.5" title="退出登录" onClick={logout}><LogOut size={16} /></button></div></div></header>
+    <main className="mx-auto max-w-6xl px-5 py-7"><div className="mb-7 flex gap-1 rounded-xl bg-ink/5 p-1 sm:w-fit"><button className={`flex items-center gap-2 rounded-lg px-4 py-2 text-sm font-medium ${tab === 'files' ? 'bg-white shadow-sm' : 'text-ink/50'}`} onClick={() => setTab('files')}><FileUp size={16} />文件空间</button>{user.canManageUsers && <button className={`flex items-center gap-2 rounded-lg px-4 py-2 text-sm font-medium ${tab === 'users' ? 'bg-white shadow-sm' : 'text-ink/50'}`} onClick={() => setTab('users')}><Users size={16} />用户管理</button>}</div>
+      {tab === 'files' ? <div className="mx-auto max-w-2xl"><UploadPanel /></div> : <UsersPanel notify={notify} />}
+    </main>{toast && <Toast message={toast} onClose={() => setToast('')} />}
+  </div>
+}
+
+export default function App() {
+  const { user, checking, checkSession } = useAppStore()
+  useEffect(() => { checkSession() }, [checkSession])
+  if (checking) return <div className="grid min-h-screen place-items-center bg-paper"><LoaderCircle className="animate-spin text-leaf" /></div>
+  if (!user) return <Login />
+  if (user.mustChangePassword) return <ChangePassword />
+  return <Dashboard />
+}
diff --git a/frontend/src/api.js b/frontend/src/api.js
new file mode 100644
index 0000000..9945348
--- /dev/null
+++ b/frontend/src/api.js
@@ -0,0 +1,18 @@
+export async function api(path, options = {}) {
+  const response = await fetch(path, options)
+  if (response.status === 204) return null
+  const body = await response.json().catch(() => ({}))
+  if (!response.ok) {
+    const error = new Error(body.error || '请求失败')
+    error.code = body.code
+    error.status = response.status
+    throw error
+  }
+  return body
+}
+
+export const json = (method, body) => ({
+  method,
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify(body),
+})
diff --git a/frontend/src/index.css b/frontend/src/index.css
new file mode 100644
index 0000000..cef45fa
--- /dev/null
+++ b/frontend/src/index.css
@@ -0,0 +1,26 @@
+@import "tailwindcss";
+
+@theme {
+  --font-sans: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
+  --color-ink: #17211b;
+  --color-paper: #f6f7f2;
+  --color-leaf: #176b45;
+  --color-mint: #d8eee1;
+  --color-line: #dce2da;
+}
+
+* { box-sizing: border-box; }
+body { margin: 0; min-width: 320px; min-height: 100vh; background: #f6f7f2; color: #17211b; }
+button, input, select { font: inherit; }
+button { cursor: pointer; }
+
+.noise {
+  background-image: radial-gradient(rgba(23, 33, 27, .08) .55px, transparent .55px);
+  background-size: 6px 6px;
+}
+
+.card { @apply rounded-2xl border border-line bg-white shadow-[0_12px_35px_rgba(23,33,27,0.06)]; }
+.field { @apply w-full rounded-xl border border-line bg-white px-3.5 py-2.5 outline-none transition focus:border-leaf focus:ring-3 focus:ring-leaf/10; }
+.btn-primary { @apply inline-flex items-center justify-center gap-2 rounded-xl bg-leaf px-4 py-2.5 font-medium text-white transition hover:bg-[#105638] disabled:cursor-not-allowed disabled:opacity-50; }
+.btn-secondary { @apply inline-flex items-center justify-center gap-2 rounded-xl border border-line bg-white px-4 py-2.5 font-medium transition hover:border-leaf/40 hover:bg-mint/30 disabled:opacity-50; }
+.label { @apply mb-1.5 block text-sm font-medium text-ink/70; }
diff --git a/frontend/src/main.jsx b/frontend/src/main.jsx
new file mode 100644
index 0000000..5253668
--- /dev/null
+++ b/frontend/src/main.jsx
@@ -0,0 +1,8 @@
+import React from 'react'
+import { createRoot } from 'react-dom/client'
+import App from './App'
+import './index.css'
+
+createRoot(document.getElementById('root')).render(
+  <React.StrictMode><App /></React.StrictMode>,
+)
diff --git a/frontend/src/store.js b/frontend/src/store.js
new file mode 100644
index 0000000..9c7af7c
--- /dev/null
+++ b/frontend/src/store.js
@@ -0,0 +1,23 @@
+import { create } from 'zustand'
+import { api, json } from './api'
+
+export const useAppStore = create((set) => ({
+  user: null,
+  checking: true,
+  users: [],
+  async checkSession() {
+    try { set({ user: await api('/api/auth/me') }) }
+    catch { set({ user: null }) }
+    finally { set({ checking: false }) }
+  },
+  async login(username, password) {
+    const user = await api('/api/auth/login', json('POST', { username, password }))
+    set({ user })
+  },
+  async logout() {
+    await api('/api/auth/logout', { method: 'POST' })
+    set({ user: null, users: [] })
+  },
+  setUser: (user) => set({ user }),
+  async loadUsers() { set({ users: await api('/api/users') }) },
+}))
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
new file mode 100644
index 0000000..a9f3a5e
--- /dev/null
+++ b/frontend/vite.config.js
@@ -0,0 +1,13 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
+
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  server: {
+    proxy: {
+      '/api': 'http://localhost:6616',
+      '/uf': 'http://localhost:6616',
+    },
+  },
+})
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2bef864
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,48 @@
+module ufile
+
+go 1.24.0
+
+require (
+	github.com/gin-gonic/gin v1.10.1
+	github.com/glebarez/sqlite v1.11.0
+	golang.org/x/crypto v0.36.0
+	gorm.io/gorm v1.25.12
+)
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/glebarez/go-sqlite v1.21.2 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	modernc.org/libc v1.22.5 // indirect
+	modernc.org/mathutil v1.5.0 // indirect
+	modernc.org/memory v1.5.0 // indirect
+	modernc.org/sqlite v1.23.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..8e0ab07
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,116 @@
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
+github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
+github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.10.1 h1:T0ujvqyCSqRopADpgPgiTT63DUQVSfojyME59Ei63pQ=
+github.com/gin-gonic/gin v1.10.1/go.mod h1:4PMNQiOhvDRa013RKVbsiNwoyezlm2rm0uX/T7kzp5Y=
+github.com/glebarez/go-sqlite v1.21.2 h1:3a6LFC4sKahUunAmynQKLZceZCOzUthkRkEAl9gAXWo=
+github.com/glebarez/go-sqlite v1.21.2/go.mod h1:sfxdZyhQjTM2Wry3gVYWaW072Ri1WMdWJi0k6+3382k=
+github.com/glebarez/sqlite v1.11.0 h1:wSG0irqzP6VurnMEpFGer5Li19RpIRi2qvQz++w0GMw=
+github.com/glebarez/sqlite v1.11.0/go.mod h1:h8/o8j5wiAsqSPoWELDUdJXhjAhsVliSn7bWZjOhrgQ=
+github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
+github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
+github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
+github.com/go-playground/validator/v10 v10.20.0 h1:K9ISHbSaI0lyB2eWMPJo+kOS/FBExVwjEviJTixqxL8=
+github.com/go-playground/validator/v10 v10.20.0/go.mod h1:dbuPbCMFw/DrkbEynArYaCwl3amGuJotoKCe95atGMM=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
+github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26/go.mod h1:dDKJzRmX4S37WGHujM7tX//fmj1uioxKzKxz3lo4HJo=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
+github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.2.7 h1:ZWSB3igEs+d0qvnxR/ZBzXVmxkgt8DdzP6m9pfuVLDM=
+github.com/klauspost/cpuid/v2 v2.2.7/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
+github.com/knz/go-libedit v1.10.1/go.mod h1:MZTVkCWyz0oBc7JOWP3wNAzd002ZbM/5hgShxwh4x8M=
+github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
+github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
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+github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
+github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
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+github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
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+golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
+golang.org/x/arch v0.8.0 h1:3wRIsP3pM4yUptoR96otTUOXI367OS0+c9eeRi9doIc=
+golang.org/x/arch v0.8.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
+golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
+golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
+golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
+golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gorm.io/gorm v1.25.12 h1:I0u8i2hWQItBq1WfE0o2+WuL9+8L21K9e2HHSTE/0f8=
+gorm.io/gorm v1.25.12/go.mod h1:xh7N7RHfYlNc5EmcI/El95gXusucDrQnHXe0+CgWcLQ=
+modernc.org/libc v1.22.5 h1:91BNch/e5B0uPbJFgqbxXuOnxBQjlS//icfQEGmvyjE=
+modernc.org/libc v1.22.5/go.mod h1:jj+Z7dTNX8fBScMVNRAYZ/jF91K8fdT2hYMThc3YjBY=
+modernc.org/mathutil v1.5.0 h1:rV0Ko/6SfM+8G+yKiyI830l3Wuz1zRutdslNoQ0kfiQ=
+modernc.org/mathutil v1.5.0/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/memory v1.5.0 h1:N+/8c5rE6EqugZwHii4IFsaJ7MUhoWX07J5tC/iI5Ds=
+modernc.org/memory v1.5.0/go.mod h1:PkUhL0Mugw21sHPeskwZW4D6VscE/GQJOnIpCnW6pSU=
+modernc.org/sqlite v1.23.1 h1:nrSBg4aRQQwq59JpvGEQ15tNxoO5pX/kUjcRNwSAGQM=
+modernc.org/sqlite v1.23.1/go.mod h1:OrDj17Mggn6MhE+iPbBNf7RGKODDE9NFT0f3EwDzJqk=
+nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..7faba77
--- /dev/null
+++ b/main.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+	"context"
+	"embed"
+	"flag"
+	"fmt"
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+)
+
+//go:embed all:frontend/dist
+var frontendAssets embed.FS
+
+func main() {
+	dataPath := flag.String("data", "data", "文件保存目录")
+	dbPath := flag.String("db", "", "SQLite 数据库路径（默认 <data>/data.db）")
+	address := flag.String("address", "0.0.0.0:6616", "监听地址")
+	flag.Parse()
+	if *dbPath == "" {
+		*dbPath = filepath.Join(*dataPath, "data.db")
+	}
+	if err := os.MkdirAll(filepath.Dir(*dbPath), 0o750); err != nil {
+		log.Fatal(err)
+	}
+	web, err := fs.Sub(frontendAssets, "frontend/dist")
+	if err != nil {
+		log.Fatal(err)
+	}
+	app, initialPassword, err := newApp(*dbPath, *dataPath, web)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if initialPassword != "" {
+		fmt.Printf("\n首次启动管理员账号：admin\n随机密码：%s\n登录后必须立即修改密码。\n\n", initialPassword)
+	}
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+	go app.runCleanup(ctx)
+	server := &http.Server{Addr: *address, Handler: app.router(), ReadHeaderTimeout: 10 * time.Second}
+	go func() {
+		<-ctx.Done()
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+		_ = server.Shutdown(shutdownCtx)
+	}()
+	log.Printf("ufile listening on %s", *address)
+	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		log.Fatal(err)
+	}
+}
diff --git a/models.go b/models.go
new file mode 100644
index 0000000..a227e7e
--- /dev/null
+++ b/models.go
@@ -0,0 +1,61 @@
+package main
+
+import "time"
+
+type User struct {
+	ID                 uint      `gorm:"primaryKey" json:"id"`
+	Username           string    `gorm:"uniqueIndex;size:32;not null" json:"username"`
+	PasswordHash       string    `json:"-"`
+	CanManageUsers     bool      `json:"canManageUsers"`
+	CanUpload          bool      `json:"canUpload"`
+	CanAdvancedUpload  bool      `json:"canAdvancedUpload"`
+	MustChangePassword bool      `json:"mustChangePassword"`
+	CreatedAt          time.Time `json:"createdAt"`
+	UpdatedAt          time.Time `json:"updatedAt"`
+}
+
+type Session struct {
+	ID        uint      `gorm:"primaryKey"`
+	TokenHash string    `gorm:"uniqueIndex;size:64;not null"`
+	UserID    uint      `gorm:"index;not null"`
+	ExpiresAt time.Time `gorm:"index;not null"`
+	CreatedAt time.Time
+}
+
+type SharedFile struct {
+	ID             uint       `gorm:"primaryKey" json:"id"`
+	Hash           string     `gorm:"uniqueIndex;size:8;not null" json:"hash"`
+	OriginalName   string     `gorm:"not null" json:"name"`
+	MimeType       string     `gorm:"not null" json:"mimeType"`
+	Size           int64      `json:"size"`
+	OwnerID        uint       `gorm:"index;not null" json:"ownerId"`
+	ExpiresAt      *time.Time `gorm:"index" json:"expiresAt"`
+	MaxDownloads   *int       `json:"maxDownloads"`
+	DownloadCount  int        `gorm:"not null;default:0" json:"downloadCount"`
+	PickupCodeHash string     `json:"-"`
+	Ready          bool       `gorm:"index;not null;default:false" json:"-"`
+	CreatedAt      time.Time  `json:"createdAt"`
+}
+
+func (f SharedFile) HasPickupCode() bool { return f.PickupCodeHash != "" }
+
+type fileResponse struct {
+	ID            uint       `json:"id"`
+	Hash          string     `json:"hash"`
+	Name          string     `json:"name"`
+	MimeType      string     `json:"mimeType"`
+	Size          int64      `json:"size"`
+	ExpiresAt     *time.Time `json:"expiresAt"`
+	MaxDownloads  *int       `json:"maxDownloads"`
+	DownloadCount int        `json:"downloadCount"`
+	HasPickupCode bool       `json:"hasPickupCode"`
+	CreatedAt     time.Time  `json:"createdAt"`
+}
+
+func presentFile(f SharedFile) fileResponse {
+	return fileResponse{
+		ID: f.ID, Hash: f.Hash, Name: f.OriginalName, MimeType: f.MimeType,
+		Size: f.Size, ExpiresAt: f.ExpiresAt, MaxDownloads: f.MaxDownloads,
+		DownloadCount: f.DownloadCount, HasPickupCode: f.HasPickupCode(), CreatedAt: f.CreatedAt,
+	}
+}