940 lines
33 KiB
Go
940 lines
33 KiB
Go
package files
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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/binary"
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"fmt"
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"image"
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"image/color"
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"io"
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stddraw "image/draw"
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_ "image/jpeg" // 注册 jpeg DecodeConfig，用于读取上传头像/图片尺寸
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"image/png"
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"math"
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"strings"
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"time"
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"telesrv/internal/domain"
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"go.uber.org/zap"
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xdraw "golang.org/x/image/draw"
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_ "golang.org/x/image/webp" // 注册 webp Decode，用于 custom emoji / sticker 静态缩略图合成
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)
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// 头像与图片消息共用的尺寸 type：'a' 小图（≤160），'c' 大图，'x' 通用下载尺寸。
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// 同一份上传字节在多个 location_key 下建 blob（不做实际缩放，dev 主路径足够）。
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// UploadProfilePhoto 把已上传文件组装成头像 Photo，落 blob/photos/profile_photos，并设为当前头像。
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func (s *Service) UploadProfilePhoto(ctx context.Context, ownerType domain.PeerType, ownerID int64, file domain.UploadedFileRef, date int) (domain.Photo, error) {
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return s.UploadProfilePhotoKind(ctx, ownerType, ownerID, domain.ProfilePhotoKindProfile, file, date)
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}
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// UploadProfilePhotoKind stores a profile or fallback photo and makes it current for that kind.
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func (s *Service) UploadProfilePhotoKind(ctx context.Context, ownerType domain.PeerType, ownerID int64, kind domain.ProfilePhotoKind, file domain.UploadedFileRef, date int) (domain.Photo, error) {
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if date == 0 {
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date = int(time.Now().Unix())
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}
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photo, err := s.CreateAvatarFromUpload(ctx, file)
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if err != nil {
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return domain.Photo{}, err
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}
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if err := s.media.AddProfilePhotoKind(ctx, ownerType, ownerID, kind, photo.ID, date); err != nil {
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return domain.Photo{}, err
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}
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return photo, nil
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}
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// CreatePhotoFromUpload 把已上传文件组装成 Photo（不绑定 profile_photos），用于频道头像 / 图片消息。
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func (s *Service) CreatePhotoFromUpload(ctx context.Context, file domain.UploadedFileRef) (domain.Photo, error) {
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data, err := s.assembleUpload(ctx, file.OwnerUserID, file.FileID, file.Parts)
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if err != nil {
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return domain.Photo{}, err
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}
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if len(data) == 0 {
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return domain.Photo{}, domain.ErrPhotoInvalid
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}
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return s.createPhoto(ctx, data, photoSizeSpecsForMessage(data))
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}
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// CreatePhotoFromBytes stores already-fetched image bytes as a message Photo.
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func (s *Service) CreatePhotoFromBytes(ctx context.Context, data []byte) (domain.Photo, error) {
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if len(data) == 0 {
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return domain.Photo{}, domain.ErrPhotoInvalid
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}
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return s.createPhoto(ctx, data, photoSizeSpecsForMessage(data))
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}
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// GetPhoto 按 id 返回已存储照片。
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func (s *Service) GetPhoto(ctx context.Context, id int64) (domain.Photo, bool, error) {
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return s.media.GetPhoto(ctx, id)
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}
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// GetDocument 按 id 返回已存储文档（贴纸 / 文件）。
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func (s *Service) GetDocument(ctx context.Context, id int64) (domain.Document, bool, error) {
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return s.media.GetDocument(ctx, id)
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}
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// CreateAvatarFromUpload 把已上传文件组装成头像 Photo（'a'/'c' 尺寸，匹配 InputPeerPhotoFileLocation
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// big/small 与 channelFull 合成尺寸的下载路径），不绑定 profile_photos。用于频道 editPhoto。
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func (s *Service) CreateAvatarFromUpload(ctx context.Context, file domain.UploadedFileRef) (domain.Photo, error) {
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data, err := s.assembleUpload(ctx, file.OwnerUserID, file.FileID, file.Parts)
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if err != nil {
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return domain.Photo{}, err
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}
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if len(data) == 0 {
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return domain.Photo{}, domain.ErrPhotoInvalid
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}
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return s.createPhoto(ctx, data, photoSizeSpecsForAvatar(data))
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}
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// CreateAvatarVideoFromUpload stores an animated profile video as photo.video_sizes.
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func (s *Service) CreateAvatarVideoFromUpload(ctx context.Context, file domain.UploadedFileRef, videoStartTs float64) (domain.Photo, error) {
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return s.createAvatarVideoFromUpload(ctx, file, videoStartTs, nil)
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}
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// CreateAvatarVideoMarkupFromUpload stores Android-style generated avatar video plus its emoji/sticker markup.
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func (s *Service) CreateAvatarVideoMarkupFromUpload(ctx context.Context, file domain.UploadedFileRef, videoStartTs float64, markup domain.PhotoSize) (domain.Photo, error) {
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if err := validateAvatarMarkupSize(markup); err != nil {
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return domain.Photo{}, err
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}
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return s.createAvatarVideoFromUpload(ctx, file, videoStartTs, []domain.PhotoSize{markup})
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}
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func (s *Service) createAvatarVideoFromUpload(ctx context.Context, file domain.UploadedFileRef, videoStartTs float64, extraSizes []domain.PhotoSize) (domain.Photo, error) {
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body, err := s.assembleUploadBlob(ctx, file.OwnerUserID, file.FileID, file.Parts)
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if err != nil {
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return domain.Photo{}, err
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}
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if body.Size == 0 {
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return domain.Photo{}, domain.ErrPhotoInvalid
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}
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photoID := randomID()
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blob := domain.FileBlob{
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LocationKey: fmt.Sprintf("photo:%d:u", photoID),
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Backend: domain.MediaBackend(s.blobs.Name()),
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ObjectKey: body.ObjectKey,
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Size: body.Size,
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SHA256: body.SHA256,
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MimeType: "video/mp4",
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}
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if err := s.media.PutFileBlob(ctx, blob); err != nil {
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return domain.Photo{}, err
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}
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s.blobCache.put(blob.LocationKey, blob)
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stillBytes := s.avatarVideoStill(ctx, body, extraSizes)
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sizes, err := s.putPhotoStaticSizes(ctx, photoID, stillBytes, photoSizeSpecsForAvatar(stillBytes))
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if err != nil {
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return domain.Photo{}, err
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}
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sizes = append(sizes, domain.PhotoSize{
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Kind: domain.PhotoSizeKindVideo,
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Type: "u",
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W: 640,
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H: 640,
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Size: int(body.Size),
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VideoStartTs: videoStartTs,
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})
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sizes = append(sizes, extraSizes...)
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photo := domain.Photo{
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ID: photoID,
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AccessHash: randomID(),
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FileReference: randomFileReference(),
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Date: int(time.Now().Unix()),
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DCID: s.dc,
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Sizes: sizes,
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}
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if err := s.media.PutPhoto(ctx, photo); err != nil {
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return domain.Photo{}, err
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}
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if err := s.cleanupUploadParts(ctx, file.OwnerUserID, file.FileID); err != nil {
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s.log.Warn("cleanup assembled avatar video upload parts failed",
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zap.Int64("owner_user_id", file.OwnerUserID),
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zap.Int64("file_id", file.FileID),
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zap.Int64("photo_id", photoID),
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zap.Error(err))
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}
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return photo, nil
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}
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// CreateAvatarMarkup stores an emoji/sticker animated profile markup as photo.video_sizes.
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func (s *Service) CreateAvatarMarkup(ctx context.Context, size domain.PhotoSize) (domain.Photo, error) {
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if err := validateAvatarMarkupSize(size); err != nil {
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return domain.Photo{}, err
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}
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photoID := randomID()
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stillBytes := s.generatedAvatarStill(ctx, size)
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sizes, err := s.putPhotoStaticSizes(ctx, photoID, stillBytes, photoSizeSpecsForAvatar(stillBytes))
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if err != nil {
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return domain.Photo{}, err
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}
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sizes = append(sizes, size)
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photo := domain.Photo{
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ID: photoID,
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AccessHash: randomID(),
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FileReference: randomFileReference(),
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Date: int(time.Now().Unix()),
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DCID: s.dc,
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Sizes: sizes,
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}
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if err := s.media.PutPhoto(ctx, photo); err != nil {
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return domain.Photo{}, err
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}
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return photo, nil
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}
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func validateAvatarMarkupSize(size domain.PhotoSize) error {
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switch size.Kind {
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case domain.PhotoSizeKindVideoEmojiMarkup:
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if size.EmojiID == 0 || len(size.BackgroundColors) == 0 {
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return domain.ErrPhotoInvalid
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}
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case domain.PhotoSizeKindVideoStickerMarkup:
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if size.StickerID == 0 || len(size.BackgroundColors) == 0 {
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return domain.ErrPhotoInvalid
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}
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default:
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return domain.ErrPhotoInvalid
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}
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return nil
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}
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// CreateDocumentFromUpload 把已上传文件组装成 Document（文件/视频/音频/gif/贴纸消息），落 blob + documents。
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func (s *Service) CreateDocumentFromUpload(ctx context.Context, file domain.UploadedFileRef, spec domain.DocumentSpec) (domain.Document, error) {
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body, err := s.assembleUploadBlob(ctx, file.OwnerUserID, file.FileID, file.Parts)
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if err != nil {
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return domain.Document{}, err
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}
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if body.Size == 0 {
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return domain.Document{}, domain.ErrDocumentInvalid
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}
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// faststart：MP4 视频若 moov 在末尾，搬到文件头以支持流式播放。普通 Telegram 客户端
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// 上传前会做这步；DrKLO 发 story 视频不转码导致 moov 在末尾，TDesktop 流式播放路径
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// 无法解复用（av_read_frame Invalid data）。不转码、保留原编码（含 HEVC）。
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body = s.maybeFaststartVideoBlob(ctx, spec.MimeType, body)
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docID := randomID()
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if err := s.media.PutFileBlob(ctx, domain.FileBlob{
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LocationKey: fmt.Sprintf("doc:%d", docID),
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Backend: domain.MediaBackend(s.blobs.Name()),
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ObjectKey: body.ObjectKey,
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Size: body.Size,
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SHA256: body.SHA256,
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MimeType: spec.MimeType,
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}); err != nil {
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return domain.Document{}, err
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}
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doc := domain.Document{
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ID: docID,
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AccessHash: randomID(),
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FileReference: randomFileReference(),
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Date: int(time.Now().Unix()),
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MimeType: spec.MimeType,
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Size: body.Size,
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DCID: s.dc,
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Attributes: spec.Attributes,
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}
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if spec.Thumb != nil {
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thumbData, err := s.assembleUpload(ctx, spec.Thumb.OwnerUserID, spec.Thumb.FileID, spec.Thumb.Parts)
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if err == nil && len(thumbData) > 0 {
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if thumb, err := s.putDocumentThumb(ctx, docID, thumbData); err == nil {
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doc.Thumbs = []domain.PhotoSize{thumb}
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}
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}
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}
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if len(doc.Thumbs) == 0 {
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if thumb, ok := s.generateVideoThumbFallbackFromBlob(ctx, docID, body.ObjectKey, body.Size, spec); ok {
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doc.Thumbs = []domain.PhotoSize{thumb}
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}
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}
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if err := s.media.PutDocument(ctx, doc); err != nil {
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return domain.Document{}, err
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}
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if err := s.cleanupUploadParts(ctx, file.OwnerUserID, file.FileID); err != nil {
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s.log.Warn("cleanup assembled document upload parts failed",
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zap.Int64("owner_user_id", file.OwnerUserID),
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zap.Int64("file_id", file.FileID),
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zap.Int64("document_id", docID),
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zap.Error(err))
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}
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return doc, nil
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}
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// maxFaststartBytes 限制 faststart 一次性载入内存的视频大小；超过则跳过（流式 faststart
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// 复杂度高，超大视频是边角）。与缩略图回退路径同样全量读 blob，内存模式无新增。
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const maxFaststartBytes = 200 << 20
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// faststartVideoMimes 是会用 moov/mdat 结构、值得尝试 faststart 的容器 mime。
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// 其它 video/*（webm 等）结构不同，faststartMP4 也会自检后 no-op，故不在此列以免白读 blob。
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var faststartVideoMimes = map[string]bool{
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"video/mp4": true,
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"video/quicktime": true,
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"video/x-m4v": true,
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}
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// maybeFaststartVideoBlob 对 MP4/MOV 视频上传尝试 faststart。性能考量：
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// 1. 先只读顶层 box 头（廉价探测）判断是否需要——绝大多数客户端上传的视频本就已 faststart，
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// 此时只发生几次 16 字节读，不读整段媒体。
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// 2. 仅 moov 在末尾时才重写；且优先走流式（仅 ftyp+moov 进内存，mdat 大块分块流式拼接），
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// 不把整段视频 2× 驻留内存。moov 非末尾的罕见排布回退到全量重排。
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// 任何不适用/失败都返回原 body，绝不让上传失败或损坏数据。
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func (s *Service) maybeFaststartVideoBlob(ctx context.Context, mimeType string, body assembledUploadBlob) assembledUploadBlob {
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if !faststartVideoMimes[strings.ToLower(strings.TrimSpace(mimeType))] {
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return body
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}
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if body.Size <= 0 || body.Size > maxFaststartBytes {
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return body
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}
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readAt := func(off, n int64) ([]byte, error) {
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data, _, err := s.blobs.GetRange(ctx, body.ObjectKey, off, n)
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return data, err
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}
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layout, ok := inspectMP4Layout(body.Size, readAt)
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if !ok || !layout.needsFaststart {
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return body // 非 MP4 / 已 faststart —— 未读整段媒体
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}
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var reader io.Reader
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if layout.moovIsLast {
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// 流式重写：只把 ftyp + moov 读进内存并 patch 偏移，mdat 区段分块流式。
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ftyp, e1 := readAt(layout.ftypStart, layout.ftypEnd-layout.ftypStart)
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moov, e2 := readAt(layout.moovStart, layout.moovEnd-layout.moovStart)
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moovSize := layout.moovEnd - layout.moovStart
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if e1 != nil || e2 != nil ||
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int64(len(ftyp)) != layout.ftypEnd-layout.ftypStart ||
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int64(len(moov)) != moovSize ||
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!patchChunkOffsets(moov, moovSize) {
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return body
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}
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mid := &blobRangeReader{ctx: ctx, blobs: s.blobs, key: body.ObjectKey, pos: layout.ftypEnd, end: layout.moovStart}
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reader = io.MultiReader(bytes.NewReader(ftyp), bytes.NewReader(moov), mid)
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} else {
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// 罕见：moov 非末尾。回退到全量读 + 重排（已测函数）。
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data, total, err := s.blobs.GetRange(ctx, body.ObjectKey, 0, body.Size)
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if err != nil || total != body.Size || int64(len(data)) != body.Size {
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return body
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}
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out, changed := faststartMP4(data)
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if !changed {
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return body
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}
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reader = bytes.NewReader(out)
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}
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key, size, sum, err := s.blobs.PutReader(ctx, reader)
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if err != nil {
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s.log.Warn("faststart re-store failed; keeping original blob",
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zap.String("mime", mimeType), zap.Int64("size", body.Size), zap.Error(err))
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return body
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}
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if size != body.Size {
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// faststart 守恒大小；不等说明流式拼接出错，丢弃新 blob 用原 blob 兜底。
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s.log.Warn("faststart size mismatch; keeping original blob",
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zap.Int64("orig", body.Size), zap.Int64("got", size))
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return body
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}
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s.log.Info("faststart applied to uploaded video",
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zap.String("mime", mimeType), zap.Int64("size", size))
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return assembledUploadBlob{ObjectKey: key, Size: size, SHA256: sum}
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}
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// blobRangeReader 把 blob 的 [pos, end) 区段按 io.Reader 调用方给的缓冲大小分块流式读出，
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// 用于 faststart 流式拼接 mdat，避免整段媒体驻留内存。
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type blobRangeReader struct {
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ctx context.Context
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blobs BlobBackend
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key string
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pos int64
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end int64
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}
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func (r *blobRangeReader) Read(p []byte) (int, error) {
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if r.pos >= r.end {
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return 0, io.EOF
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}
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want := r.end - r.pos
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if want > int64(len(p)) {
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want = int64(len(p))
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}
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data, _, err := r.blobs.GetRange(r.ctx, r.key, r.pos, want)
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if err != nil {
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return 0, err
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}
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if len(data) == 0 {
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return 0, io.ErrUnexpectedEOF // 区段内不应读到空，避免静默截断
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}
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n := copy(p, data)
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r.pos += int64(n)
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return n, nil
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}
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// CreateDocumentFromBytes stores already-fetched bytes as a message Document.
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func (s *Service) CreateDocumentFromBytes(ctx context.Context, data []byte, spec domain.DocumentSpec) (domain.Document, error) {
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if len(data) == 0 {
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return domain.Document{}, domain.ErrDocumentInvalid
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}
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if strings.TrimSpace(spec.MimeType) == "" {
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spec.MimeType = "application/octet-stream"
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}
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objectKey, size, sum, err := s.blobs.PutReader(ctx, bytes.NewReader(data))
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if err != nil {
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return domain.Document{}, err
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}
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if size == 0 {
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return domain.Document{}, domain.ErrDocumentInvalid
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}
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docID := randomID()
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if err := s.media.PutFileBlob(ctx, domain.FileBlob{
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LocationKey: fmt.Sprintf("doc:%d", docID),
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Backend: domain.MediaBackend(s.blobs.Name()),
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ObjectKey: objectKey,
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Size: size,
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SHA256: sum,
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MimeType: spec.MimeType,
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}); err != nil {
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return domain.Document{}, err
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}
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doc := domain.Document{
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ID: docID,
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AccessHash: randomID(),
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FileReference: randomFileReference(),
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Date: int(time.Now().Unix()),
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MimeType: spec.MimeType,
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Size: size,
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DCID: s.dc,
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Attributes: spec.Attributes,
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}
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if thumb, ok := s.generateVideoThumbFallbackFromBlob(ctx, docID, objectKey, size, spec); ok {
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doc.Thumbs = []domain.PhotoSize{thumb}
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}
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if err := s.media.PutDocument(ctx, doc); err != nil {
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return domain.Document{}, err
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}
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return doc, nil
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}
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|
||
// SetCurrentProfilePhoto 把已存在的 photo 设为当前头像（updateProfilePhoto 选历史头像）。
|
||
func (s *Service) SetCurrentProfilePhoto(ctx context.Context, ownerType domain.PeerType, ownerID, photoID int64, date int) (domain.Photo, bool, error) {
|
||
return s.SetCurrentProfilePhotoKind(ctx, ownerType, ownerID, domain.ProfilePhotoKindProfile, photoID, date)
|
||
}
|
||
|
||
// SetCurrentProfilePhotoKind sets an existing photo as current for profile or fallback history.
|
||
func (s *Service) SetCurrentProfilePhotoKind(ctx context.Context, ownerType domain.PeerType, ownerID int64, kind domain.ProfilePhotoKind, photoID int64, date int) (domain.Photo, bool, error) {
|
||
photo, ok, err := s.media.GetPhoto(ctx, photoID)
|
||
if err != nil || !ok {
|
||
return domain.Photo{}, ok, err
|
||
}
|
||
if date == 0 {
|
||
date = int(time.Now().Unix())
|
||
}
|
||
if err := s.media.AddProfilePhotoKind(ctx, ownerType, ownerID, kind, photoID, date); err != nil {
|
||
return domain.Photo{}, false, err
|
||
}
|
||
return photo, true, nil
|
||
}
|
||
|
||
// CurrentProfilePhoto 返回某 owner 的当前头像 Photo。
|
||
func (s *Service) CurrentProfilePhoto(ctx context.Context, ownerType domain.PeerType, ownerID int64) (domain.Photo, bool, error) {
|
||
return s.CurrentProfilePhotoKind(ctx, ownerType, ownerID, domain.ProfilePhotoKindProfile)
|
||
}
|
||
|
||
// CurrentProfilePhotoKind returns the current profile/fallback photo.
|
||
func (s *Service) CurrentProfilePhotoKind(ctx context.Context, ownerType domain.PeerType, ownerID int64, kind domain.ProfilePhotoKind) (domain.Photo, bool, error) {
|
||
id, ok, err := s.media.CurrentProfilePhotoKind(ctx, ownerType, ownerID, kind)
|
||
if err != nil || !ok {
|
||
return domain.Photo{}, ok, err
|
||
}
|
||
return s.media.GetPhoto(ctx, id)
|
||
}
|
||
|
||
// GetProfilePhotos 返回 owner 的头像历史（最新在前）。
|
||
func (s *Service) GetProfilePhotos(ctx context.Context, ownerType domain.PeerType, ownerID int64, offset, limit int, maxID int64) ([]domain.Photo, int, error) {
|
||
return s.GetProfilePhotosKind(ctx, ownerType, ownerID, domain.ProfilePhotoKindProfile, offset, limit, maxID)
|
||
}
|
||
|
||
// GetProfilePhotosKind returns profile/fallback photo history.
|
||
func (s *Service) GetProfilePhotosKind(ctx context.Context, ownerType domain.PeerType, ownerID int64, kind domain.ProfilePhotoKind, offset, limit int, maxID int64) ([]domain.Photo, int, error) {
|
||
return s.media.ListProfilePhotoDetailsKind(ctx, ownerType, ownerID, kind, offset, limit, maxID)
|
||
}
|
||
|
||
// DeleteProfilePhotos 停用指定头像，返回成功停用数量。
|
||
func (s *Service) DeleteProfilePhotos(ctx context.Context, ownerType domain.PeerType, ownerID int64, photoIDs []int64) (int, error) {
|
||
return s.DeleteProfilePhotosKind(ctx, ownerType, ownerID, domain.ProfilePhotoKindProfile, photoIDs)
|
||
}
|
||
|
||
// DeleteProfilePhotosKind disables profile/fallback photos of the selected kind.
|
||
func (s *Service) DeleteProfilePhotosKind(ctx context.Context, ownerType domain.PeerType, ownerID int64, kind domain.ProfilePhotoKind, photoIDs []int64) (int, error) {
|
||
deleted, err := s.media.DeleteProfilePhotosKind(ctx, ownerType, ownerID, kind, photoIDs)
|
||
if err != nil {
|
||
return 0, err
|
||
}
|
||
return len(deleted), nil
|
||
}
|
||
|
||
// createPhoto 把字节落 blob（每个尺寸一个 location_key，指向同一内容）并写 photos 表。
|
||
func (s *Service) createPhoto(ctx context.Context, data []byte, specs []photoSizeSpec) (domain.Photo, error) {
|
||
photoID := randomID()
|
||
sizes, err := s.putPhotoStaticSizes(ctx, photoID, data, specs)
|
||
if err != nil {
|
||
return domain.Photo{}, err
|
||
}
|
||
photo := domain.Photo{
|
||
ID: photoID,
|
||
AccessHash: randomID(),
|
||
FileReference: randomFileReference(),
|
||
Date: int(time.Now().Unix()),
|
||
DCID: s.dc,
|
||
Sizes: sizes,
|
||
}
|
||
if err := s.media.PutPhoto(ctx, photo); err != nil {
|
||
return domain.Photo{}, err
|
||
}
|
||
return photo, nil
|
||
}
|
||
|
||
func (s *Service) putPhotoStaticSizes(ctx context.Context, photoID int64, data []byte, specs []photoSizeSpec) ([]domain.PhotoSize, error) {
|
||
objectKey, err := s.blobs.Put(ctx, data)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
mimeType := imageMimeType(data)
|
||
sizes := make([]domain.PhotoSize, 0, len(specs))
|
||
for _, spec := range specs {
|
||
blob := domain.FileBlob{
|
||
LocationKey: fmt.Sprintf("photo:%d:%s", photoID, spec.Type),
|
||
Backend: domain.MediaBackend(s.blobs.Name()),
|
||
ObjectKey: objectKey,
|
||
Size: int64(len(data)),
|
||
MimeType: mimeType,
|
||
}
|
||
if err := s.media.PutFileBlob(ctx, blob); err != nil {
|
||
return nil, err
|
||
}
|
||
s.blobCache.put(blob.LocationKey, blob)
|
||
sizes = append(sizes, domain.PhotoSize{Kind: domain.PhotoSizeKindDefault, Type: spec.Type, W: spec.W, H: spec.H, Size: len(data)})
|
||
}
|
||
s.prewarmSmallBlob(objectKey, data)
|
||
return sizes, nil
|
||
}
|
||
|
||
func (s *Service) putDocumentThumb(ctx context.Context, docID int64, thumbData []byte) (domain.PhotoSize, error) {
|
||
if len(thumbData) == 0 {
|
||
return domain.PhotoSize{}, fmt.Errorf("empty document thumbnail")
|
||
}
|
||
thumbKey, err := s.blobs.Put(ctx, thumbData)
|
||
if err != nil {
|
||
return domain.PhotoSize{}, err
|
||
}
|
||
w, h := imageDimensions(thumbData, 0, 0)
|
||
blob := domain.FileBlob{
|
||
LocationKey: fmt.Sprintf("doc:%d:m", docID),
|
||
Backend: domain.MediaBackend(s.blobs.Name()),
|
||
ObjectKey: thumbKey,
|
||
Size: int64(len(thumbData)),
|
||
MimeType: "image/jpeg",
|
||
}
|
||
if err := s.media.PutFileBlob(ctx, blob); err != nil {
|
||
return domain.PhotoSize{}, err
|
||
}
|
||
s.blobCache.put(blob.LocationKey, blob)
|
||
s.prewarmSmallBlob(thumbKey, thumbData)
|
||
return domain.PhotoSize{Kind: domain.PhotoSizeKindDefault, Type: "m", W: w, H: h, Size: len(thumbData)}, nil
|
||
}
|
||
|
||
func (s *Service) generateVideoThumbFallback(ctx context.Context, docID int64, data []byte, spec domain.DocumentSpec) (domain.PhotoSize, bool) {
|
||
if s.thumbs == nil || !documentSpecIsVideo(spec) || len(data) > videoThumbnailMaxInputBytes {
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
thumbData, err := s.thumbs.Extract(ctx, data, spec.MimeType)
|
||
if err != nil {
|
||
s.log.Warn("server-side video thumbnail fallback failed",
|
||
zap.Int64("document_id", docID),
|
||
zap.String("mime_type", spec.MimeType),
|
||
zap.Int64("bytes", int64(len(data))),
|
||
zap.Error(err))
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
thumb, err := s.putDocumentThumb(ctx, docID, thumbData)
|
||
if err != nil {
|
||
s.log.Warn("store server-side video thumbnail failed",
|
||
zap.Int64("document_id", docID),
|
||
zap.String("mime_type", spec.MimeType),
|
||
zap.Int64("thumb_bytes", int64(len(thumbData))),
|
||
zap.Error(err))
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
return thumb, true
|
||
}
|
||
|
||
func (s *Service) generateVideoThumbFallbackFromBlob(ctx context.Context, docID int64, objectKey string, size int64, spec domain.DocumentSpec) (domain.PhotoSize, bool) {
|
||
if s.thumbs == nil || !documentSpecIsVideo(spec) || size > videoThumbnailMaxInputBytes {
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
data, total, err := s.blobs.GetRange(ctx, objectKey, 0, size)
|
||
if err != nil {
|
||
s.log.Warn("read video blob for thumbnail fallback failed",
|
||
zap.Int64("document_id", docID),
|
||
zap.String("mime_type", spec.MimeType),
|
||
zap.Int64("bytes", size),
|
||
zap.Error(err))
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
if int64(len(data)) != total || total != size {
|
||
s.log.Warn("video blob size mismatch for thumbnail fallback",
|
||
zap.Int64("document_id", docID),
|
||
zap.Int64("expected_size", size),
|
||
zap.Int64("total_size", total),
|
||
zap.Int("read_bytes", len(data)))
|
||
return domain.PhotoSize{}, false
|
||
}
|
||
return s.generateVideoThumbFallback(ctx, docID, data, spec)
|
||
}
|
||
|
||
func documentSpecIsVideo(spec domain.DocumentSpec) bool {
|
||
if strings.HasPrefix(strings.ToLower(strings.TrimSpace(spec.MimeType)), "video/") {
|
||
return true
|
||
}
|
||
for _, attr := range spec.Attributes {
|
||
if attr.Kind == domain.DocAttrVideo {
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
type photoSizeSpec struct {
|
||
Type string
|
||
W int
|
||
H int
|
||
}
|
||
|
||
func photoSizeSpecsForAvatar(data []byte) []photoSizeSpec {
|
||
w, h := imageDimensions(data, 640, 640)
|
||
small := 160
|
||
if w < small {
|
||
small = w
|
||
}
|
||
return []photoSizeSpec{
|
||
{Type: "a", W: small, H: small},
|
||
{Type: "c", W: w, H: h},
|
||
}
|
||
}
|
||
|
||
// photoSizeSpecsForMessage 给图片消息生成下载尺寸（'m' 缩略 + 'x'/'y' 大图）。
|
||
func photoSizeSpecsForMessage(data []byte) []photoSizeSpec {
|
||
w, h := imageDimensions(data, 1280, 1280)
|
||
thumbW, thumbH := scaleDown(w, h, 320)
|
||
return []photoSizeSpec{
|
||
{Type: "m", W: thumbW, H: thumbH},
|
||
{Type: "x", W: w, H: h},
|
||
}
|
||
}
|
||
|
||
func imageDimensions(data []byte, defW, defH int) (int, int) {
|
||
cfg, _, err := image.DecodeConfig(bytes.NewReader(data))
|
||
if err != nil || cfg.Width <= 0 || cfg.Height <= 0 {
|
||
return defW, defH
|
||
}
|
||
return cfg.Width, cfg.Height
|
||
}
|
||
|
||
func scaleDown(w, h, max int) (int, int) {
|
||
if w <= max && h <= max {
|
||
return w, h
|
||
}
|
||
if w >= h {
|
||
return max, max * h / w
|
||
}
|
||
return max * w / h, max
|
||
}
|
||
|
||
const (
|
||
avatarStillSize = 640
|
||
avatarMarkupScale = 0.70
|
||
avatarMarkupMaxSourceBytes = 2 << 20 // emoji/sticker thumb 小对象保护线。
|
||
)
|
||
|
||
// avatarVideoStill 生成动画头像的静态尺寸字节：优先抽取上传视频首帧——动画头像
|
||
// （emoji/sticker 构造器或自选视频）的首帧就是用户在客户端看到的真实画面（彩色
|
||
// emoji、圆角、布局都一致）；抽帧不可用时回退到按 markup 服务端合成。
|
||
func (s *Service) avatarVideoStill(ctx context.Context, body assembledUploadBlob, extraSizes []domain.PhotoSize) []byte {
|
||
if s.thumbs != nil && body.Size > 0 && body.Size <= videoThumbnailMaxInputBytes {
|
||
data, total, err := s.blobs.GetRange(ctx, body.ObjectKey, 0, body.Size)
|
||
if err == nil && int64(len(data)) == total && total == body.Size {
|
||
if thumb, err := s.thumbs.Extract(ctx, data, "video/mp4"); err == nil && len(thumb) > 0 {
|
||
return thumb
|
||
} else if err != nil {
|
||
s.log.Debug("extract avatar video first frame failed, falling back to composed still",
|
||
zap.String("object_key", body.ObjectKey),
|
||
zap.Int64("bytes", body.Size),
|
||
zap.Error(err))
|
||
}
|
||
} else if err != nil {
|
||
s.log.Warn("read avatar video blob for still failed",
|
||
zap.String("object_key", body.ObjectKey),
|
||
zap.Int64("bytes", body.Size),
|
||
zap.Error(err))
|
||
}
|
||
}
|
||
return s.generatedAvatarStill(ctx, avatarStillMarkup(extraSizes))
|
||
}
|
||
|
||
func (s *Service) generatedAvatarStill(ctx context.Context, markup domain.PhotoSize) []byte {
|
||
img := generatedAvatarBackground(markup.BackgroundColors)
|
||
if overlay, tintWhite, ok := s.avatarMarkupOverlay(ctx, markup); ok {
|
||
drawAvatarMarkup(img, overlay, tintWhite)
|
||
}
|
||
return encodeAvatarPNG(img)
|
||
}
|
||
|
||
func generatedAvatarBackground(colors []int) *image.RGBA {
|
||
if len(colors) == 0 {
|
||
colors = []int{0x5b8def, 0x53c6a4}
|
||
}
|
||
first := rgbColor(colors[0])
|
||
last := first
|
||
if len(colors) > 1 {
|
||
last = rgbColor(colors[len(colors)-1])
|
||
}
|
||
img := image.NewRGBA(image.Rect(0, 0, avatarStillSize, avatarStillSize))
|
||
for y := 0; y < avatarStillSize; y++ {
|
||
t := float64(y) / float64(avatarStillSize-1)
|
||
row := lerpColor(first, last, t)
|
||
for x := 0; x < avatarStillSize; x++ {
|
||
img.SetRGBA(x, y, row)
|
||
}
|
||
}
|
||
return img
|
||
}
|
||
|
||
func encodeAvatarPNG(img image.Image) []byte {
|
||
var buf bytes.Buffer
|
||
_ = png.Encode(&buf, img)
|
||
return buf.Bytes()
|
||
}
|
||
|
||
// avatarMarkupOverlay 加载 markup 引用文档的静态缩略图作为合成贴图。第二个返回值
|
||
// 表示是否染白：仅 text_color 的 custom emoji（单色、由客户端按文字色适配渲染，
|
||
// 头像背景上的约定呈现是白色剪影）需要染白，普通彩色 emoji / sticker 保留原色。
|
||
func (s *Service) avatarMarkupOverlay(ctx context.Context, markup domain.PhotoSize) (image.Image, bool, bool) {
|
||
if s == nil || s.media == nil {
|
||
return nil, false, false
|
||
}
|
||
docID := int64(0)
|
||
switch markup.Kind {
|
||
case domain.PhotoSizeKindVideoEmojiMarkup:
|
||
docID = markup.EmojiID
|
||
case domain.PhotoSizeKindVideoStickerMarkup:
|
||
docID = markup.StickerID
|
||
default:
|
||
return nil, false, false
|
||
}
|
||
if docID == 0 {
|
||
return nil, false, false
|
||
}
|
||
doc, found, err := s.media.GetDocument(ctx, docID)
|
||
if err != nil {
|
||
s.log.Warn("load avatar markup document failed", zap.Int64("document_id", docID), zap.Error(err))
|
||
return nil, false, false
|
||
}
|
||
if !found {
|
||
return nil, false, false
|
||
}
|
||
data, ok := s.avatarMarkupBytes(ctx, doc)
|
||
if !ok {
|
||
return nil, false, false
|
||
}
|
||
img, _, err := image.Decode(bytes.NewReader(data))
|
||
if err != nil {
|
||
s.log.Debug("decode avatar markup thumbnail failed",
|
||
zap.Int64("document_id", doc.ID),
|
||
zap.String("mime_type", doc.MimeType),
|
||
zap.Error(err))
|
||
return nil, false, false
|
||
}
|
||
return img, documentIsTextColorEmoji(doc), true
|
||
}
|
||
|
||
// documentIsTextColorEmoji 判断文档是否为声明 text_color 的 custom emoji。
|
||
func documentIsTextColorEmoji(doc domain.Document) bool {
|
||
for _, attr := range doc.Attributes {
|
||
if attr.Kind == domain.DocAttrCustomEmoji {
|
||
return attr.TextColor
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
func (s *Service) avatarMarkupBytes(ctx context.Context, doc domain.Document) ([]byte, bool) {
|
||
var best []byte
|
||
bestScore := -1
|
||
for _, thumb := range doc.Thumbs {
|
||
score := avatarThumbScore(thumb)
|
||
if score <= bestScore {
|
||
continue
|
||
}
|
||
switch thumb.Kind {
|
||
case domain.PhotoSizeKindCached:
|
||
if len(thumb.Bytes) == 0 || len(thumb.Bytes) > avatarMarkupMaxSourceBytes {
|
||
continue
|
||
}
|
||
best = append([]byte(nil), thumb.Bytes...)
|
||
bestScore = score
|
||
case domain.PhotoSizeKindDefault, domain.PhotoSizeKindProgressive:
|
||
if thumb.Type == "" || thumb.Size <= 0 || thumb.Size > avatarMarkupMaxSourceBytes {
|
||
continue
|
||
}
|
||
data, ok := s.readSmallBlob(ctx, fmt.Sprintf("doc:%d:%s", doc.ID, thumb.Type), int64(thumb.Size))
|
||
if !ok {
|
||
continue
|
||
}
|
||
best = data
|
||
bestScore = score
|
||
}
|
||
}
|
||
if len(best) > 0 {
|
||
return best, true
|
||
}
|
||
if strings.HasPrefix(strings.ToLower(strings.TrimSpace(doc.MimeType)), "image/") &&
|
||
doc.Size > 0 && doc.Size <= avatarMarkupMaxSourceBytes {
|
||
return s.readSmallBlob(ctx, fmt.Sprintf("doc:%d", doc.ID), doc.Size)
|
||
}
|
||
return nil, false
|
||
}
|
||
|
||
func (s *Service) readSmallBlob(ctx context.Context, locationKey string, expectedSize int64) ([]byte, bool) {
|
||
if expectedSize <= 0 || expectedSize > avatarMarkupMaxSourceBytes {
|
||
return nil, false
|
||
}
|
||
blob, found, err := s.media.GetFileBlob(ctx, locationKey)
|
||
if err != nil {
|
||
s.log.Warn("load avatar markup blob metadata failed",
|
||
zap.String("location_key", locationKey),
|
||
zap.Error(err))
|
||
return nil, false
|
||
}
|
||
if !found || blob.Size <= 0 || blob.Size > avatarMarkupMaxSourceBytes {
|
||
return nil, false
|
||
}
|
||
data, total, err := s.blobs.GetRange(ctx, blob.ObjectKey, 0, blob.Size)
|
||
if err != nil {
|
||
s.log.Warn("read avatar markup blob failed",
|
||
zap.String("location_key", locationKey),
|
||
zap.String("object_key", blob.ObjectKey),
|
||
zap.Error(err))
|
||
return nil, false
|
||
}
|
||
if int64(len(data)) != total || total != blob.Size {
|
||
return nil, false
|
||
}
|
||
return data, true
|
||
}
|
||
|
||
func avatarThumbScore(size domain.PhotoSize) int {
|
||
if size.W > 0 && size.H > 0 {
|
||
return size.W * size.H
|
||
}
|
||
if size.Size > 0 {
|
||
return size.Size
|
||
}
|
||
return len(size.Bytes)
|
||
}
|
||
|
||
// drawAvatarMarkup 把贴图缩放后居中画到背景上。默认保留贴图原色（彩色 emoji /
|
||
// sticker 头像），仅 tintWhite 时染成白色剪影。
|
||
func drawAvatarMarkup(dst *image.RGBA, src image.Image, tintWhite bool) {
|
||
srcBounds := src.Bounds()
|
||
sw, sh := srcBounds.Dx(), srcBounds.Dy()
|
||
if sw <= 0 || sh <= 0 {
|
||
return
|
||
}
|
||
max := int(math.Round(float64(dst.Bounds().Dx()) * avatarMarkupScale))
|
||
if max <= 0 {
|
||
return
|
||
}
|
||
scale := math.Min(float64(max)/float64(sw), float64(max)/float64(sh))
|
||
w := maxInt(1, int(math.Round(float64(sw)*scale)))
|
||
h := maxInt(1, int(math.Round(float64(sh)*scale)))
|
||
rect := image.Rect(
|
||
(dst.Bounds().Dx()-w)/2,
|
||
(dst.Bounds().Dy()-h)/2,
|
||
(dst.Bounds().Dx()+w)/2,
|
||
(dst.Bounds().Dy()+h)/2,
|
||
)
|
||
scaled := image.NewRGBA(image.Rect(0, 0, rect.Dx(), rect.Dy()))
|
||
xdraw.CatmullRom.Scale(scaled, scaled.Bounds(), src, srcBounds, xdraw.Src, nil)
|
||
if tintWhite {
|
||
tintWhitePremultiplied(scaled)
|
||
}
|
||
stddraw.Draw(dst, rect, scaled, image.Point{}, stddraw.Over)
|
||
}
|
||
|
||
// tintWhitePremultiplied 把贴图就地染成白色剪影（保留 alpha 形状）。image.RGBA 是
|
||
// alpha 预乘存储，分量必须满足 R,G,B ≤ A：若写入 R=G=B=255 而 A<255 的非法值，
|
||
// draw.Over 合成会算术溢出回绕，凡 alpha 不恰为 255 的像素整片输出近黑色。
|
||
func tintWhitePremultiplied(img *image.RGBA) {
|
||
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
|
||
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
|
||
_, _, _, a := img.At(x, y).RGBA()
|
||
v := uint8(a >> 8)
|
||
img.SetRGBA(x, y, color.RGBA{R: v, G: v, B: v, A: v})
|
||
}
|
||
}
|
||
}
|
||
|
||
func maxInt(a, b int) int {
|
||
if a > b {
|
||
return a
|
||
}
|
||
return b
|
||
}
|
||
|
||
func rgbColor(v int) color.RGBA {
|
||
u := uint32(v)
|
||
return color.RGBA{R: uint8(u >> 16), G: uint8(u >> 8), B: uint8(u), A: 255}
|
||
}
|
||
|
||
func lerpColor(a, b color.RGBA, t float64) color.RGBA {
|
||
lerp := func(x, y uint8) uint8 {
|
||
return uint8(float64(x)*(1-t) + float64(y)*t)
|
||
}
|
||
return color.RGBA{R: lerp(a.R, b.R), G: lerp(a.G, b.G), B: lerp(a.B, b.B), A: 255}
|
||
}
|
||
|
||
func imageMimeType(data []byte) string {
|
||
if len(data) >= 8 && bytes.Equal(data[:8], []byte{0x89, 'P', 'N', 'G', '\r', '\n', 0x1a, '\n'}) {
|
||
return "image/png"
|
||
}
|
||
if len(data) >= 3 && data[0] == 0xff && data[1] == 0xd8 && data[2] == 0xff {
|
||
return "image/jpeg"
|
||
}
|
||
return "application/octet-stream"
|
||
}
|
||
|
||
func avatarStillMarkup(sizes []domain.PhotoSize) domain.PhotoSize {
|
||
for _, size := range sizes {
|
||
if size.Kind == domain.PhotoSizeKindVideoEmojiMarkup || size.Kind == domain.PhotoSizeKindVideoStickerMarkup {
|
||
return size
|
||
}
|
||
if len(size.BackgroundColors) > 0 {
|
||
return domain.PhotoSize{BackgroundColors: append([]int(nil), size.BackgroundColors...)}
|
||
}
|
||
}
|
||
return domain.PhotoSize{}
|
||
}
|
||
|
||
func randomID() int64 {
|
||
var b [8]byte
|
||
_, _ = rand.Read(b[:])
|
||
v := int64(binary.BigEndian.Uint64(b[:]) >> 1)
|
||
if v == 0 {
|
||
v = 1
|
||
}
|
||
return v
|
||
}
|
||
|
||
func randomFileReference() []byte {
|
||
b := make([]byte, 16)
|
||
_, _ = rand.Read(b)
|
||
return b
|
||
}
|