freefire
4f3f3a265c
新增模块： - 友链（friendlink）后端处理 + 前端管理页与友链板 - 书库（library）：导入、章节、封面、阅读页、横竖版自适应 AdaptiveCoverSlot - 顶栏导航（header_nav）配置与 MobileTabBar/MobileRailDrawers 移动端抽屉 - 排行榜 service 测试、站点页面测试、时间线发布（timeline_release） 其它改动： - 后端 handlers/services 全量小幅调整 - 前端组件、库函数、URL/品牌/站点 URL 工具更新 - Lightbox 图片、MdEntries 条目卡、coverColor 派生色相等前端能力
719 lines
20 KiB
Go
719 lines
20 KiB
Go
package service
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import (
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"bytes"
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"context"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"image"
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_ "image/gif"
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_ "image/jpeg"
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_ "image/png"
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"io"
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"log"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/freefire/jiang13-bbs/model"
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webpenc "github.com/gen2brain/webp"
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"golang.org/x/image/webp"
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"gorm.io/gorm"
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)
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// 头像限制：大小限制以【裁剪后】的 WebP 文件为准（前端裁剪为正方形后上传）
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const (
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AvatarMaxBytes = 2 << 20 // 2 MiB
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AvatarMinDim = 64
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AvatarMaxDim = 512
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// 帖子插图：JPEG/PNG 统一转存 WebP；GIF（动图）与已是 WebP 的原样保留
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ImageMaxBytes = 5 << 20 // 5 MiB（对原始上传文件生效）
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ImageMaxDim = 4096
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// JPEG 转 WebP 的有损质量；PNG 走无损，不受此参数影响
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ImageWebPQuality = 80
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// 站点背景图（前台/后台墙纸）
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BackgroundMaxBytes = 8 << 20 // 8 MiB
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BackgroundMaxDim = 8192
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)
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// UploadService 附件上传：落盘到 data/uploads，元信息入库 attachments
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type UploadService struct {
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ops *Operations
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db *gorm.DB
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dir string // 上传根目录（如 data/uploads）
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setting *SettingService
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}
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func NewUploadService(db *gorm.DB, uploadDir string) *UploadService {
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return &UploadService{db: db, dir: uploadDir}
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}
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// WithSetting 注入站点设置（插图体积上限）
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func (s *UploadService) WithSetting(setting *SettingService) *UploadService {
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s.setting = setting
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return s
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}
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func (s *UploadService) imageMaxBytes() int64 {
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if s.setting == nil {
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return ImageMaxBytes
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}
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n, err := s.setting.ImageMaxBytes()
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if err != nil || n < 1 {
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return ImageMaxBytes
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}
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return n
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}
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// EnsureDir 启动时确保上传目录存在
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func (s *UploadService) EnsureDir() error {
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if err := os.MkdirAll(filepath.Join(s.dir, "avatars"), 0o755); err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Join(s.dir, "images"), 0o755); err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Join(s.dir, "backgrounds"), 0o755); err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Join(s.dir, "ads"), 0o755); err != nil {
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return err
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}
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return os.MkdirAll(filepath.Join(s.dir, "brand"), 0o755)
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}
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// SaveAvatar 保存裁剪后的 WebP 头像：校验魔数/大小/尺寸 → 落盘 → 写附件记录 → 更新用户头像
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func (s *UploadService) SaveAvatar(userID uint, data []byte) (*model.Attachment, error) {
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if len(data) == 0 {
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return nil, errors.New("文件为空")
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}
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if len(data) > AvatarMaxBytes {
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return nil, errors.New("裁剪后的图片不能超过 2MB")
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}
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// WebP 魔数：RIFF????WEBP
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if len(data) < 12 || string(data[0:4]) != "RIFF" || string(data[8:12]) != "WEBP" {
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return nil, errors.New("仅支持 WebP 格式图片")
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}
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// 解码尺寸（服务端不信任前端传入的宽高）
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cfg, err := webp.DecodeConfig(bytes.NewReader(data))
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if err != nil {
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return nil, errors.New("无法解析 WebP 图片")
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}
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if cfg.Width != cfg.Height {
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return nil, errors.New("头像必须为正方形")
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}
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if cfg.Width < AvatarMinDim || cfg.Width > AvatarMaxDim {
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return nil, errors.New("头像尺寸需在 64~512px 之间")
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}
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nameBytes := make([]byte, 16)
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if _, err := rand.Read(nameBytes); err != nil {
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return nil, err
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}
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filename := hex.EncodeToString(nameBytes) + ".webp"
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fullPath := filepath.Join(s.dir, "avatars", filename)
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if err := os.WriteFile(fullPath, data, 0o644); err != nil {
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return nil, err
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}
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att := &model.Attachment{
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UserID: userID,
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Kind: model.AttachmentKindAvatar,
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URL: "/uploads/avatars/" + filename,
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MIME: "image/webp",
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Size: len(data),
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Width: cfg.Width,
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Height: cfg.Height,
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}
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if s.ops != nil {
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id, e := s.ops.StoreFile(fullPath, att.MIME, true)
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if e != nil {
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_ = os.Remove(fullPath)
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return nil, e
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}
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if id != "" {
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att.URL = "/api/media/" + id
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_ = os.Remove(fullPath)
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}
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}
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// 附件记录与用户头像更新在同一事务内完成
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err = s.db.Transaction(func(tx *gorm.DB) error {
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if err := tx.Create(att).Error; err != nil {
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return err
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}
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return tx.Model(&model.User{}).Where("id = ?", userID).Update("avatar", att.URL).Error
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})
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if err != nil {
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_ = os.Remove(fullPath) // DB 失败时清理已落盘文件
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return nil, err
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}
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return att, nil
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}
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// imageFormat 由魔数识别的插图格式
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type imageFormat struct {
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ext string
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mime string
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}
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func detectImageFormat(data []byte) (imageFormat, error) {
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if len(data) >= 3 && data[0] == 0xff && data[1] == 0xd8 && data[2] == 0xff {
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return imageFormat{ext: ".jpg", mime: "image/jpeg"}, nil
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}
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if len(data) >= 8 && string(data[0:8]) == "\x89PNG\r\n\x1a\n" {
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return imageFormat{ext: ".png", mime: "image/png"}, nil
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}
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if len(data) >= 12 && string(data[0:4]) == "RIFF" && string(data[8:12]) == "WEBP" {
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return imageFormat{ext: ".webp", mime: "image/webp"}, nil
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}
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if len(data) >= 6 && (string(data[0:6]) == "GIF87a" || string(data[0:6]) == "GIF89a") {
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return imageFormat{ext: ".gif", mime: "image/gif"}, nil
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}
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return imageFormat{}, errors.New("仅支持 JPEG / PNG / WebP / GIF")
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}
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func decodeImageSizeReader(r io.Reader, mime string) (w, h int, err error) {
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var cfg image.Config
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switch mime {
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case "image/webp":
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cfg, err = webp.DecodeConfig(r)
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default:
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cfg, _, err = image.DecodeConfig(r)
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}
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if err != nil {
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return 0, 0, errors.New("无法解析图片")
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}
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return cfg.Width, cfg.Height, nil
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}
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// transcodeImageToWebP 把校验通过的 JPEG/PNG 临时文件解码后转码为 WebP：
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// JPEG 走有损 q80，PNG 走无损（保留透明通道与文字锐度）。
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// 成功返回新文件名/MIME/大小并清理原临时文件；失败返回 error（调用方保留原格式落盘）。
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func (s *UploadService) transcodeImageToWebP(tmp, name, ext string) (string, string, int64, error) {
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webpName := strings.TrimSuffix(name, ext) + ".webp"
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webpPath := filepath.Join(s.dir, "images", webpName)
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webpTmp := webpPath + ".partial"
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if s.ops != nil {
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release, e := s.ops.BeginTemporary(webpTmp)
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if e != nil {
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return "", "", 0, e
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}
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defer release()
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}
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f, err := os.Open(tmp)
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if err != nil {
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return "", "", 0, err
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}
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img, _, err := image.Decode(f) // 仅 JPEG/PNG 会走到这里，解码器已在文件头注册
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_ = f.Close()
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if err != nil {
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return "", "", 0, err
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}
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var buf bytes.Buffer
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if err := webpenc.Encode(&buf, img, webpenc.Options{
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Quality: ImageWebPQuality,
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Lossless: ext == ".png",
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}); err != nil {
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return "", "", 0, err
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}
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if err := os.WriteFile(webpTmp, buf.Bytes(), 0o644); err != nil {
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_ = os.Remove(webpTmp)
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return "", "", 0, err
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}
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if err := os.Rename(webpTmp, webpPath); err != nil {
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_ = os.Remove(webpTmp)
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return "", "", 0, err
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}
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_ = os.Remove(tmp)
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return webpName, "image/webp", int64(buf.Len()), nil
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}
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// SaveImage 流式保存帖子插图：校验格式/大小/尺寸 → JPEG/PNG 转 WebP → 落盘 → 写 attachments（kind=image）
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func (s *UploadService) SaveImage(userID uint, src io.Reader) (*model.Attachment, error) {
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if src == nil {
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return nil, errors.New("文件为空")
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}
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maxB := s.imageMaxBytes()
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tooLarge := func() error {
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mb := int(maxB >> 20)
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if mb < 1 {
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mb = 1
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}
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return errors.New("图片不能超过 " + strconv.Itoa(mb) + "MB")
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}
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// 先读魔数头，再与剩余流合并落盘，整图不进内存
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head := make([]byte, 12)
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n, err := io.ReadFull(src, head)
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if err != nil && !errors.Is(err, io.ErrUnexpectedEOF) && !errors.Is(err, io.EOF) {
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return nil, errors.New("读取图片失败")
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}
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if n == 0 {
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return nil, errors.New("文件为空")
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}
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format, err := detectImageFormat(head[:n])
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if err != nil {
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return nil, err
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}
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nameBytes := make([]byte, 16)
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if _, err := rand.Read(nameBytes); err != nil {
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return nil, err
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}
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filename := hex.EncodeToString(nameBytes) + format.ext
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fullPath := filepath.Join(s.dir, "images", filename)
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tmp := fullPath + ".partial"
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if s.ops != nil {
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release, e := s.ops.BeginTemporary(tmp)
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if e != nil {
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return nil, e
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}
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defer release()
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}
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f, err := os.OpenFile(tmp, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
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if err != nil {
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return nil, err
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}
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remain := maxB + 1 - int64(n)
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if remain < 0 {
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_ = f.Close()
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_ = os.Remove(tmp)
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return nil, tooLarge()
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}
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writtenHead, err := f.Write(head[:n])
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if err != nil {
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_ = f.Close()
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_ = os.Remove(tmp)
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return nil, err
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}
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writtenRest, copyErr := io.Copy(f, io.LimitReader(src, remain))
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_ = f.Close()
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if copyErr != nil {
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_ = os.Remove(tmp)
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return nil, copyErr
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}
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total := int64(writtenHead) + writtenRest
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if total == 0 {
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_ = os.Remove(tmp)
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return nil, errors.New("文件为空")
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}
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if total > maxB {
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_ = os.Remove(tmp)
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return nil, tooLarge()
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}
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rf, err := os.Open(tmp)
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if err != nil {
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_ = os.Remove(tmp)
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return nil, err
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}
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w, h, err := decodeImageSizeReader(rf, format.mime)
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_ = rf.Close()
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if err != nil {
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_ = os.Remove(tmp)
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return nil, err
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}
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if w < 1 || h < 1 {
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_ = os.Remove(tmp)
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return nil, errors.New("无效的图片尺寸")
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}
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if w > ImageMaxDim || h > ImageMaxDim {
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_ = os.Remove(tmp)
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return nil, errors.New("图片边长不能超过 4096px")
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}
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// JPEG/PNG 统一转存 WebP；GIF（动图）与已是 WebP 的原样保留
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storeName, storeMime, storeSize := filename, format.mime, total
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storePath := fullPath
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if format.mime == "image/jpeg" || format.mime == "image/png" {
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name, mime, size, err := s.transcodeImageToWebP(tmp, filename, format.ext)
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if err != nil {
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log.Printf("[upload] 插图转 WebP 失败，保留原格式 %s: %v", filename, err)
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} else {
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storeName, storeMime, storeSize = name, mime, size
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storePath = filepath.Join(s.dir, "images", name)
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}
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}
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if storePath == fullPath {
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if err := os.Rename(tmp, fullPath); err != nil {
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_ = os.Remove(tmp)
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return nil, err
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}
|
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}
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att := &model.Attachment{
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UserID: userID,
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Kind: model.AttachmentKindImage,
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URL: "/uploads/images/" + storeName,
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MIME: storeMime,
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Size: int(storeSize),
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Width: w,
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Height: h,
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}
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if s.ops != nil {
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id, e := s.ops.StoreFile(storePath, att.MIME, true)
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if e != nil {
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_ = os.Remove(storePath)
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return nil, e
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}
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if id != "" {
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att.URL = "/api/media/" + id
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_ = os.Remove(storePath)
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}
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}
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if err := s.db.Create(att).Error; err != nil {
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_ = os.Remove(storePath)
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return nil, err
|
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}
|
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return att, nil
|
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}
|
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|
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// SaveBackground 保存站点背景图到 uploads/backgrounds，不进用户媒体库
|
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func (s *UploadService) SaveBackground(src io.Reader) (string, error) {
|
||
if src == nil {
|
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return "", errors.New("文件为空")
|
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}
|
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tooLarge := func() error {
|
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return errors.New("背景图不能超过 8MB")
|
||
}
|
||
|
||
head := make([]byte, 12)
|
||
n, err := io.ReadFull(src, head)
|
||
if err != nil && !errors.Is(err, io.ErrUnexpectedEOF) && !errors.Is(err, io.EOF) {
|
||
return "", errors.New("读取图片失败")
|
||
}
|
||
if n == 0 {
|
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return "", errors.New("文件为空")
|
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}
|
||
format, err := detectImageFormat(head[:n])
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
|
||
if err := os.MkdirAll(filepath.Join(s.dir, "backgrounds"), 0o755); err != nil {
|
||
return "", err
|
||
}
|
||
|
||
nameBytes := make([]byte, 16)
|
||
if _, err := rand.Read(nameBytes); err != nil {
|
||
return "", err
|
||
}
|
||
filename := hex.EncodeToString(nameBytes) + format.ext
|
||
fullPath := filepath.Join(s.dir, "backgrounds", filename)
|
||
tmp := fullPath + ".partial"
|
||
if s.ops != nil {
|
||
release, e := s.ops.BeginTemporary(tmp)
|
||
if e != nil {
|
||
return "", e
|
||
}
|
||
defer release()
|
||
}
|
||
|
||
f, err := os.OpenFile(tmp, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
remain := BackgroundMaxBytes + 1 - int64(n)
|
||
if remain < 0 {
|
||
_ = f.Close()
|
||
_ = os.Remove(tmp)
|
||
return "", tooLarge()
|
||
}
|
||
if _, err := f.Write(head[:n]); err != nil {
|
||
_ = f.Close()
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
writtenRest, copyErr := io.Copy(f, io.LimitReader(src, remain))
|
||
_ = f.Close()
|
||
if copyErr != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", copyErr
|
||
}
|
||
total := int64(n) + writtenRest
|
||
if total > BackgroundMaxBytes {
|
||
_ = os.Remove(tmp)
|
||
return "", tooLarge()
|
||
}
|
||
|
||
rf, err := os.Open(tmp)
|
||
if err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
w, h, err := decodeImageSizeReader(rf, format.mime)
|
||
_ = rf.Close()
|
||
if err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
if w < 1 || h < 1 {
|
||
_ = os.Remove(tmp)
|
||
return "", errors.New("无效的图片尺寸")
|
||
}
|
||
if w > BackgroundMaxDim || h > BackgroundMaxDim {
|
||
_ = os.Remove(tmp)
|
||
return "", errors.New("背景图边长不能超过 8192px")
|
||
}
|
||
if err := os.Rename(tmp, fullPath); err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
return "/uploads/backgrounds/" + filename, nil
|
||
}
|
||
|
||
const AdAssetMaxBytes = 2 << 20 // 收款码 / 广告素材 2MB
|
||
|
||
// SaveAdAsset 保存广告相关图片（收款码等）到 uploads/ads，保留原格式含 GIF
|
||
func (s *UploadService) SaveAdAsset(src io.Reader) (string, error) {
|
||
if src == nil {
|
||
return "", errors.New("文件为空")
|
||
}
|
||
tooLarge := func() error { return errors.New("图片不能超过 2MB") }
|
||
|
||
head := make([]byte, 12)
|
||
n, err := io.ReadFull(src, head)
|
||
if err != nil && !errors.Is(err, io.ErrUnexpectedEOF) && !errors.Is(err, io.EOF) {
|
||
return "", errors.New("读取图片失败")
|
||
}
|
||
if n == 0 {
|
||
return "", errors.New("文件为空")
|
||
}
|
||
format, err := detectImageFormat(head[:n])
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
if err := os.MkdirAll(filepath.Join(s.dir, "ads"), 0o755); err != nil {
|
||
return "", err
|
||
}
|
||
nameBytes := make([]byte, 16)
|
||
if _, err := rand.Read(nameBytes); err != nil {
|
||
return "", err
|
||
}
|
||
filename := hex.EncodeToString(nameBytes) + format.ext
|
||
fullPath := filepath.Join(s.dir, "ads", filename)
|
||
tmp := fullPath + ".partial"
|
||
if s.ops != nil {
|
||
release, e := s.ops.BeginTemporary(tmp)
|
||
if e != nil {
|
||
return "", e
|
||
}
|
||
defer release()
|
||
}
|
||
f, err := os.OpenFile(tmp, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
remain := AdAssetMaxBytes + 1 - int64(n)
|
||
if remain < 0 {
|
||
_ = f.Close()
|
||
_ = os.Remove(tmp)
|
||
return "", tooLarge()
|
||
}
|
||
if _, err := f.Write(head[:n]); err != nil {
|
||
_ = f.Close()
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
writtenRest, copyErr := io.Copy(f, io.LimitReader(src, remain))
|
||
_ = f.Close()
|
||
if copyErr != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", copyErr
|
||
}
|
||
if int64(n)+writtenRest > AdAssetMaxBytes {
|
||
_ = os.Remove(tmp)
|
||
return "", tooLarge()
|
||
}
|
||
rf, err := os.Open(tmp)
|
||
if err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
w, h, err := decodeImageSizeReader(rf, format.mime)
|
||
_ = rf.Close()
|
||
if err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
if w < 1 || h < 1 || w > 4096 || h > 4096 {
|
||
_ = os.Remove(tmp)
|
||
return "", errors.New("图片尺寸无效")
|
||
}
|
||
if err := os.Rename(tmp, fullPath); err != nil {
|
||
_ = os.Remove(tmp)
|
||
return "", err
|
||
}
|
||
return "/uploads/ads/" + filename, nil
|
||
}
|
||
|
||
// CopyBackgroundFromMedia 把当前用户媒体库里的一张图复制进 backgrounds，不写站点设置
|
||
func (s *UploadService) CopyBackgroundFromMedia(userID, attachmentID uint) (string, error) {
|
||
var att model.Attachment
|
||
if err := s.db.Where("id = ? AND user_id = ?", attachmentID, userID).First(&att).Error; err != nil {
|
||
return "", errors.New("图片不存在或不属于你")
|
||
}
|
||
if strings.HasPrefix(att.URL, "/api/media/") && s.ops != nil {
|
||
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
||
defer cancel()
|
||
r, _, e := s.ops.OpenObject(ctx, RemoteObjectID(att.URL), true)
|
||
if e != nil {
|
||
return "", e
|
||
}
|
||
defer r.Close()
|
||
return s.SaveBackground(r)
|
||
}
|
||
abs, ok := s.safeUploadPath(att.URL)
|
||
if !ok {
|
||
return "", errors.New("无效的图片地址")
|
||
}
|
||
f, err := os.Open(abs)
|
||
if err != nil {
|
||
return "", errors.New("读取图片失败")
|
||
}
|
||
defer f.Close()
|
||
return s.SaveBackground(f)
|
||
}
|
||
|
||
// CopyImageFromMedia 把当前用户媒体库里的一张图复制一份新插图（落 uploads/images 并记一条本人附件）
|
||
// 用于书籍封面等长期引用场景：与原图解耦，原图删除后副本仍可用
|
||
func (s *UploadService) CopyImageFromMedia(userID, attachmentID uint) (*model.Attachment, error) {
|
||
var att model.Attachment
|
||
if err := s.db.Where("id = ? AND user_id = ?", attachmentID, userID).First(&att).Error; err != nil {
|
||
return nil, errors.New("图片不存在或不属于你")
|
||
}
|
||
if strings.HasPrefix(att.URL, "/api/media/") && s.ops != nil {
|
||
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
||
defer cancel()
|
||
r, _, e := s.ops.OpenObject(ctx, RemoteObjectID(att.URL), true)
|
||
if e != nil {
|
||
return nil, e
|
||
}
|
||
defer r.Close()
|
||
return s.SaveImage(userID, r)
|
||
}
|
||
abs, ok := s.safeUploadPath(att.URL)
|
||
if !ok {
|
||
return nil, errors.New("无效的图片地址")
|
||
}
|
||
f, err := os.Open(abs)
|
||
if err != nil {
|
||
return nil, errors.New("读取图片失败")
|
||
}
|
||
defer f.Close()
|
||
return s.SaveImage(userID, f)
|
||
}
|
||
|
||
// BackgroundFileExists 确认 URL 对应文件在 backgrounds 目录内
|
||
func (s *UploadService) BackgroundFileExists(url string) bool {
|
||
rel := BgRelPath(url)
|
||
if rel == "" {
|
||
return false
|
||
}
|
||
abs := filepath.Join(s.dir, rel)
|
||
info, err := os.Stat(abs)
|
||
return err == nil && !info.IsDir()
|
||
}
|
||
|
||
// RemoveBackgroundIfUnused 旧墙纸不再被前台或后台引用时删除物理文件
|
||
func (s *UploadService) RemoveBackgroundIfUnused(oldURL, siteURL, adminURL string) {
|
||
if oldURL == "" || oldURL == siteURL || oldURL == adminURL {
|
||
return
|
||
}
|
||
rel := BgRelPath(oldURL)
|
||
if rel == "" {
|
||
return
|
||
}
|
||
abs := filepath.Join(s.dir, rel)
|
||
if err := os.Remove(abs); err != nil && !os.IsNotExist(err) {
|
||
log.Printf("[upload] 删除背景图失败 path=%s: %v", abs, err)
|
||
}
|
||
}
|
||
|
||
// UseAvatar 选用一张【本人历史上传】的头像
|
||
func (s *UploadService) UseAvatar(userID uint, url string) error {
|
||
url = strings.TrimSpace(url)
|
||
if (!strings.HasPrefix(url, "/uploads/avatars/") && !strings.HasPrefix(url, "/api/media/")) || len(url) > 512 {
|
||
return errors.New("无效的头像地址")
|
||
}
|
||
var count int64
|
||
s.db.Model(&model.Attachment{}).
|
||
Where("user_id = ? AND kind = ? AND url = ?", userID, model.AttachmentKindAvatar, url).
|
||
Count(&count)
|
||
if count == 0 {
|
||
return errors.New("该图片不存在或不属于你")
|
||
}
|
||
return s.db.Model(&model.User{}).Where("id = ?", userID).Update("avatar", url).Error
|
||
}
|
||
|
||
// mediaListSize 媒体库最多返回的图片数
|
||
const mediaListSize = 60
|
||
|
||
// ListMedia 媒体库：本人上传的【全部】图片（头像、帖子插图等所有 kind），最新在前
|
||
func (s *UploadService) ListMedia(userID uint) ([]model.Attachment, error) {
|
||
var list []model.Attachment
|
||
err := s.db.Where("user_id = ?", userID).
|
||
Order("id DESC").Limit(mediaListSize).Find(&list).Error
|
||
return list, err
|
||
}
|
||
|
||
// ErrAttachmentInUse 图片正被帖子内容引用，不可物理删除
|
||
var ErrAttachmentInUse = errors.New("该图片已被帖子使用，无法删除")
|
||
|
||
// DeleteAttachment 彻底删除本人附件：DB 记录 + 物理文件。
|
||
// - 若该图正被某篇未删除帖子的正文引用，拒绝删除（防止帖子里出现裂图）
|
||
// - 若该图正是当前头像，同步把 user.avatar 置空（回到字母头像）
|
||
func (s *UploadService) DeleteAttachment(userID, attachmentID uint) error {
|
||
var att model.Attachment
|
||
if err := s.db.Where("id = ? AND user_id = ?", attachmentID, userID).First(&att).Error; err != nil {
|
||
return errors.New("图片不存在或不属于你")
|
||
}
|
||
|
||
// 帖子正文引用保护（GORM 默认过滤已删除帖子）
|
||
var refCount int64
|
||
s.db.Model(&model.Post{}).
|
||
Where("content LIKE ?", "%"+att.URL+"%").
|
||
Count(&refCount)
|
||
if refCount > 0 {
|
||
return ErrAttachmentInUse
|
||
}
|
||
|
||
err := s.db.Transaction(func(tx *gorm.DB) error {
|
||
// 当前头像正指向该文件：置空，避免悬挂引用
|
||
if err := tx.Model(&model.User{}).
|
||
Where("id = ? AND avatar = ?", userID, att.URL).
|
||
Update("avatar", "").Error; err != nil {
|
||
return err
|
||
}
|
||
return tx.Delete(&model.Attachment{}, att.ID).Error
|
||
})
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
if s.ops != nil && strings.HasPrefix(att.URL, "/api/media/") {
|
||
if e := s.ops.RemoveObject(RemoteObjectID(att.URL)); e != nil {
|
||
return errors.New("记录已删除，远程文件清理未完成，请联系管理员")
|
||
}
|
||
return nil
|
||
}
|
||
// DB 已清理后再删物理文件；文件删除失败只记日志（不影响用户侧结果）
|
||
abs := filepath.Join(s.dir, filepath.FromSlash(strings.TrimPrefix(att.URL, "/uploads/")))
|
||
if err := os.Remove(abs); err != nil && !os.IsNotExist(err) {
|
||
log.Printf("[upload] 删除附件文件失败 id=%d path=%s: %v", att.ID, abs, err)
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func (s *UploadService) WithOperations(o *Operations) { s.ops = o }
|