GoToSocial/internal/media/processingmedia.go

453 lines
13 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package media
import (
"bytes"
"context"
"fmt"
"image/jpeg"
"io"
"sync"
"time"
"github.com/disintegration/imaging"
"github.com/h2non/filetype"
terminator "github.com/superseriousbusiness/exif-terminator"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
// ProcessingMedia represents a piece of media that is currently being processed. It exposes
// various functions for retrieving data from the process.
type ProcessingMedia struct {
media *gtsmodel.MediaAttachment // processing media attachment details
recache bool // recaching existing (uncached) media
dataFn DataFunc // load-data function, returns media stream
postFn PostDataCallbackFunc // post data callback function
err error // error encountered during processing
manager *manager // manager instance (access to db / storage)
once sync.Once // once ensures processing only occurs once
}
// AttachmentID returns the ID of the underlying media attachment without blocking processing.
func (p *ProcessingMedia) AttachmentID() string {
return p.media.ID // immutable, safe outside mutex.
}
// LoadAttachment blocks until the thumbnail and fullsize content
// has been processed, and then returns the completed attachment.
func (p *ProcessingMedia) LoadAttachment(ctx context.Context) (*gtsmodel.MediaAttachment, error) {
// only process once.
p.once.Do(func() {
var err error
defer func() {
if r := recover(); r != nil {
if err != nil {
rOld := r // wrap the panic so we don't lose existing returned error
r = fmt.Errorf("panic occured after error %q: %v", err.Error(), rOld)
}
// Catch any panics and wrap as error.
err = fmt.Errorf("caught panic: %v", r)
}
if err != nil {
// Store error.
p.err = err
}
}()
// Attempt to store media and calculate
// full-size media attachment details.
if err = p.store(ctx); err != nil {
return
}
// Finish processing by reloading media into
// memory to get dimension and generate a thumb.
if err = p.finish(ctx); err != nil {
return
}
if p.recache {
// Existing attachment we're recaching, so only need to update.
err = p.manager.db.UpdateByID(ctx, p.media, p.media.ID)
return
}
// New attachment, first time caching.
err = p.manager.db.Put(ctx, p.media)
return //nolint shutup linter i like this here
})
if p.err != nil {
return nil, p.err
}
return p.media, nil
}
// store calls the data function attached to p if it hasn't been called yet,
// and updates the underlying attachment fields as necessary. It will then stream
// bytes from p's reader directly into storage so that it can be retrieved later.
func (p *ProcessingMedia) store(ctx context.Context) error {
defer func() {
if p.postFn == nil {
return
}
// ensure post callback gets called.
if err := p.postFn(ctx); err != nil {
log.Errorf("error executing postdata function: %v", err)
}
}()
// Load media from provided data fun
rc, sz, err := p.dataFn(ctx)
if err != nil {
return fmt.Errorf("error executing data function: %w", err)
}
defer func() {
// Ensure data reader gets closed on return.
if err := rc.Close(); err != nil {
log.Errorf("error closing data reader: %v", err)
}
}()
// Byte buffer to read file header into.
// See: https://en.wikipedia.org/wiki/File_format#File_header
// and https://github.com/h2non/filetype
hdrBuf := make([]byte, 261)
// Read the first 261 header bytes into buffer.
if _, err := io.ReadFull(rc, hdrBuf); err != nil {
return fmt.Errorf("error reading incoming media: %w", err)
}
// Parse file type info from header buffer.
info, err := filetype.Match(hdrBuf)
if err != nil {
return fmt.Errorf("error parsing file type: %w", err)
}
// Recombine header bytes with remaining stream
r := io.MultiReader(bytes.NewReader(hdrBuf), rc)
switch info.Extension {
case "mp4":
p.media.Type = gtsmodel.FileTypeVideo
case "gif":
p.media.Type = gtsmodel.FileTypeImage
case "jpg", "jpeg", "png", "webp":
p.media.Type = gtsmodel.FileTypeImage
if sz > 0 {
// A file size was provided so we can clean exif data from image.
r, err = terminator.Terminate(r, int(sz), info.Extension)
if err != nil {
return fmt.Errorf("error cleaning exif data: %w", err)
}
}
default:
return fmt.Errorf("unsupported file type: %s", info.Extension)
}
// Calculate attachment file path.
p.media.File.Path = fmt.Sprintf(
"%s/%s/%s/%s.%s",
p.media.AccountID,
TypeAttachment,
SizeOriginal,
p.media.ID,
info.Extension,
)
// This shouldn't already exist, but we do a check as it's worth logging.
if have, _ := p.manager.storage.Has(ctx, p.media.File.Path); have {
log.Warnf("media already exists at storage path: %s", p.media.File.Path)
// Attempt to remove existing media at storage path (might be broken / out-of-date)
if err := p.manager.storage.Delete(ctx, p.media.File.Path); err != nil {
return fmt.Errorf("error removing media from storage: %v", err)
}
}
// Write the final image reader stream to our storage.
sz, err = p.manager.storage.PutStream(ctx, p.media.File.Path, r)
if err != nil {
return fmt.Errorf("error writing media to storage: %w", err)
}
// Set written image size.
p.media.File.FileSize = int(sz)
// Fill in remaining attachment data now it's stored.
p.media.URL = uris.GenerateURIForAttachment(
p.media.AccountID,
string(TypeAttachment),
string(SizeOriginal),
p.media.ID,
info.Extension,
)
p.media.File.ContentType = info.MIME.Value
cached := true
p.media.Cached = &cached
return nil
}
func (p *ProcessingMedia) finish(ctx context.Context) error {
// Fetch a stream to the original file in storage.
rc, err := p.manager.storage.GetStream(ctx, p.media.File.Path)
if err != nil {
return fmt.Errorf("error loading file from storage: %w", err)
}
defer rc.Close()
var fullImg *gtsImage
switch p.media.File.ContentType {
// .jpeg, .gif, .webp image type
case mimeImageJpeg, mimeImageGif, mimeImageWebp:
fullImg, err = decodeImage(rc, imaging.AutoOrientation(true))
if err != nil {
return fmt.Errorf("error decoding image: %w", err)
}
// .png image (requires ancillary chunk stripping)
case mimeImagePng:
fullImg, err = decodeImage(&PNGAncillaryChunkStripper{
Reader: rc,
}, imaging.AutoOrientation(true))
if err != nil {
return fmt.Errorf("error decoding image: %w", err)
}
// .mp4 video type
case mimeVideoMp4:
video, err := decodeVideoFrame(rc)
if err != nil {
return fmt.Errorf("error decoding video: %w", err)
}
// Set video frame as image.
fullImg = video.frame
// Set video metadata in attachment info.
p.media.FileMeta.Original.Duration = &video.duration
p.media.FileMeta.Original.Framerate = &video.framerate
p.media.FileMeta.Original.Bitrate = &video.bitrate
}
// The image should be in-memory by now.
if err := rc.Close(); err != nil {
return fmt.Errorf("error closing file: %w", err)
}
// Set full-size dimensions in attachment info.
p.media.FileMeta.Original.Width = int(fullImg.Width())
p.media.FileMeta.Original.Height = int(fullImg.Height())
p.media.FileMeta.Original.Size = int(fullImg.Size())
p.media.FileMeta.Original.Aspect = fullImg.AspectRatio()
// Calculate attachment thumbnail file path
p.media.Thumbnail.Path = fmt.Sprintf(
"%s/%s/%s/%s.jpg",
p.media.AccountID,
TypeAttachment,
SizeSmall,
p.media.ID,
)
// Get smaller thumbnail image
thumbImg := fullImg.Thumbnail()
// Garbage collector, you may
// now take our large son.
fullImg = nil
// Blurhash needs generating from thumb.
hash, err := thumbImg.Blurhash()
if err != nil {
return fmt.Errorf("error generating blurhash: %w", err)
}
// Set the attachment blurhash.
p.media.Blurhash = hash
// This shouldn't already exist, but we do a check as it's worth logging.
if have, _ := p.manager.storage.Has(ctx, p.media.Thumbnail.Path); have {
log.Warnf("thumbnail already exists at storage path: %s", p.media.Thumbnail.Path)
// Attempt to remove existing thumbnail at storage path (might be broken / out-of-date)
if err := p.manager.storage.Delete(ctx, p.media.Thumbnail.Path); err != nil {
return fmt.Errorf("error removing thumbnail from storage: %v", err)
}
}
// Create a thumbnail JPEG encoder stream.
enc := thumbImg.ToJPEG(&jpeg.Options{
Quality: 70, // enough for a thumbnail.
})
// Stream-encode the JPEG thumbnail image into storage.
sz, err := p.manager.storage.PutStream(ctx, p.media.Thumbnail.Path, enc)
if err != nil {
return fmt.Errorf("error stream-encoding thumbnail to storage: %w", err)
}
// Fill in remaining thumbnail now it's stored
p.media.Thumbnail.ContentType = mimeImageJpeg
p.media.Thumbnail.URL = uris.GenerateURIForAttachment(
p.media.AccountID,
string(TypeAttachment),
string(SizeSmall),
p.media.ID,
"jpg", // always jpeg
)
// Set thumbnail dimensions in attachment info.
p.media.FileMeta.Small = gtsmodel.Small{
Width: int(thumbImg.Width()),
Height: int(thumbImg.Height()),
Size: int(thumbImg.Size()),
Aspect: thumbImg.AspectRatio(),
}
// Set written image size.
p.media.Thumbnail.FileSize = int(sz)
// Finally set the attachment as processed and update time.
p.media.Processing = gtsmodel.ProcessingStatusProcessed
p.media.File.UpdatedAt = time.Now()
return nil
}
func (m *manager) preProcessMedia(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, accountID string, ai *AdditionalMediaInfo) (*ProcessingMedia, error) {
id, err := id.NewRandomULID()
if err != nil {
return nil, err
}
avatar := false
header := false
cached := false
// populate initial fields on the media attachment -- some of these will be overwritten as we proceed
attachment := &gtsmodel.MediaAttachment{
ID: id,
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
StatusID: "",
URL: "", // we don't know yet because it depends on the uncalled DataFunc
RemoteURL: "",
Type: gtsmodel.FileTypeUnknown, // we don't know yet because it depends on the uncalled DataFunc
FileMeta: gtsmodel.FileMeta{},
AccountID: accountID,
Description: "",
ScheduledStatusID: "",
Blurhash: "",
Processing: gtsmodel.ProcessingStatusReceived,
File: gtsmodel.File{UpdatedAt: time.Now()},
Thumbnail: gtsmodel.Thumbnail{UpdatedAt: time.Now()},
Avatar: &avatar,
Header: &header,
Cached: &cached,
}
// check if we have additional info to add to the attachment,
// and overwrite some of the attachment fields if so
if ai != nil {
if ai.CreatedAt != nil {
attachment.CreatedAt = *ai.CreatedAt
}
if ai.StatusID != nil {
attachment.StatusID = *ai.StatusID
}
if ai.RemoteURL != nil {
attachment.RemoteURL = *ai.RemoteURL
}
if ai.Description != nil {
attachment.Description = *ai.Description
}
if ai.ScheduledStatusID != nil {
attachment.ScheduledStatusID = *ai.ScheduledStatusID
}
if ai.Blurhash != nil {
attachment.Blurhash = *ai.Blurhash
}
if ai.Avatar != nil {
attachment.Avatar = ai.Avatar
}
if ai.Header != nil {
attachment.Header = ai.Header
}
if ai.FocusX != nil {
attachment.FileMeta.Focus.X = *ai.FocusX
}
if ai.FocusY != nil {
attachment.FileMeta.Focus.Y = *ai.FocusY
}
}
processingMedia := &ProcessingMedia{
media: attachment,
dataFn: data,
postFn: postData,
manager: m,
}
return processingMedia, nil
}
func (m *manager) preProcessRecache(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, id string) (*ProcessingMedia, error) {
// get the existing attachment from database.
attachment, err := m.db.GetAttachmentByID(ctx, id)
if err != nil {
return nil, err
}
processingMedia := &ProcessingMedia{
media: attachment,
dataFn: data,
postFn: postData,
manager: m,
recache: true, // indicate it's a recache
}
return processingMedia, nil
}