gotosocial/internal/media/processingemoji.go

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/*
GoToSocial
Copyright (C) 2021-2022 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 (
"context"
"fmt"
"strings"
"sync"
"time"
"codeberg.org/gruf/go-store/kv"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
// ProcessingEmoji represents an emoji currently processing. It exposes
// various functions for retrieving data from the process.
type ProcessingEmoji struct {
mu sync.Mutex
// id of this instance's account -- pinned for convenience here so we only need to fetch it once
instanceAccountID string
/*
below fields should be set on newly created media;
emoji will be updated incrementally as media goes through processing
*/
emoji *gtsmodel.Emoji
data DataFunc
rawData []byte // will be set once the fetchRawData function has been called
/*
below fields represent the processing state of the static version of the emoji
*/
staticState processState
static *ImageMeta
/*
below fields represent the processing state of the emoji image
*/
fullSizeState processState
fullSize *ImageMeta
/*
below pointers to database and storage are maintained so that
the media can store and update itself during processing steps
*/
database db.DB
storage *kv.KVStore
err error // error created during processing, if any
}
// EmojiID returns the ID of the underlying emoji without blocking processing.
func (p *ProcessingEmoji) EmojiID() string {
return p.emoji.ID
}
// LoadEmoji blocks until the static and fullsize image
// has been processed, and then returns the completed emoji.
func (p *ProcessingEmoji) LoadEmoji(ctx context.Context) (*gtsmodel.Emoji, error) {
if err := p.fetchRawData(ctx); err != nil {
return nil, err
}
if _, err := p.loadStatic(ctx); err != nil {
return nil, err
}
if _, err := p.loadFullSize(ctx); err != nil {
return nil, err
}
return p.emoji, nil
}
// Finished returns true if processing has finished for both the thumbnail
// and full fized version of this piece of media.
func (p *ProcessingEmoji) Finished() bool {
return p.staticState == complete && p.fullSizeState == complete
}
func (p *ProcessingEmoji) loadStatic(ctx context.Context) (*ImageMeta, error) {
p.mu.Lock()
defer p.mu.Unlock()
switch p.staticState {
case received:
// we haven't processed a static version of this emoji yet so do it now
static, err := deriveStaticEmoji(p.rawData, p.emoji.ImageContentType)
if err != nil {
p.err = fmt.Errorf("error deriving static: %s", err)
p.staticState = errored
return nil, p.err
}
// put the static in storage
if err := p.storage.Put(p.emoji.ImageStaticPath, static.image); err != nil {
p.err = fmt.Errorf("error storing static: %s", err)
p.staticState = errored
return nil, p.err
}
// set appropriate fields on the emoji based on the static version we derived
p.attachment.FileMeta.Small = gtsmodel.Small{
Width: static.width,
Height: static.height,
Size: static.size,
Aspect: static.aspect,
}
p.attachment.Thumbnail.FileSize = static.size
if err := putOrUpdateAttachment(ctx, p.database, p.attachment); err != nil {
p.err = err
p.thumbstate = errored
return nil, err
}
// set the thumbnail of this media
p.thumb = static
// we're done processing the thumbnail!
p.thumbstate = complete
fallthrough
case complete:
return p.thumb, nil
case errored:
return nil, p.err
}
return nil, fmt.Errorf("thumbnail processing status %d unknown", p.thumbstate)
}
func (p *ProcessingEmoji) loadFullSize(ctx context.Context) (*ImageMeta, error) {
p.mu.Lock()
defer p.mu.Unlock()
switch p.fullSizeState {
case received:
var clean []byte
var err error
var decoded *ImageMeta
ct := p.attachment.File.ContentType
switch ct {
case mimeImageJpeg, mimeImagePng:
// first 'clean' image by purging exif data from it
var exifErr error
if clean, exifErr = purgeExif(p.rawData); exifErr != nil {
err = exifErr
break
}
decoded, err = decodeImage(clean, ct)
case mimeImageGif:
// gifs are already clean - no exif data to remove
clean = p.rawData
decoded, err = decodeGif(clean)
default:
err = fmt.Errorf("content type %s not a processible image type", ct)
}
if err != nil {
p.err = err
p.fullSizeState = errored
return nil, err
}
// put the full size in storage
if err := p.storage.Put(p.attachment.File.Path, decoded.image); err != nil {
p.err = fmt.Errorf("error storing full size image: %s", err)
p.fullSizeState = errored
return nil, p.err
}
// set appropriate fields on the attachment based on the image we derived
p.attachment.FileMeta.Original = gtsmodel.Original{
Width: decoded.width,
Height: decoded.height,
Size: decoded.size,
Aspect: decoded.aspect,
}
p.attachment.File.FileSize = decoded.size
p.attachment.File.UpdatedAt = time.Now()
p.attachment.Processing = gtsmodel.ProcessingStatusProcessed
if err := putOrUpdateAttachment(ctx, p.database, p.attachment); err != nil {
p.err = err
p.fullSizeState = errored
return nil, err
}
// set the fullsize of this media
p.fullSize = decoded
// we're done processing the full-size image
p.fullSizeState = complete
fallthrough
case complete:
return p.fullSize, nil
case errored:
return nil, p.err
}
return nil, fmt.Errorf("full size processing status %d unknown", p.fullSizeState)
}
// fetchRawData calls the data function attached to p if it hasn't been called yet,
// and updates the underlying attachment fields as necessary.
// It should only be called from within a function that already has a lock on p!
func (p *ProcessingEmoji) fetchRawData(ctx context.Context) error {
// check if we've already done this and bail early if we have
if p.rawData != nil {
return nil
}
// execute the data function and pin the raw bytes for further processing
b, err := p.data(ctx)
if err != nil {
return fmt.Errorf("fetchRawData: error executing data function: %s", err)
}
p.rawData = b
// now we have the data we can work out the content type
contentType, err := parseContentType(p.rawData)
if err != nil {
return fmt.Errorf("fetchRawData: error parsing content type: %s", err)
}
if !supportedEmoji(contentType) {
return fmt.Errorf("fetchRawData: content type %s was not valid for an emoji", contentType)
}
split := strings.Split(contentType, "/")
mainType := split[0] // something like 'image'
extension := split[1] // something like 'gif'
// set some additional fields on the emoji now that
// we know more about what the underlying image actually is
p.emoji.ImageURL = uris.GenerateURIForAttachment(p.attachment.AccountID, string(TypeAttachment), string(SizeOriginal), p.attachment.ID, extension)
p.attachment.File.Path = fmt.Sprintf("%s/%s/%s/%s.%s", p.attachment.AccountID, TypeAttachment, SizeOriginal, p.attachment.ID, extension)
p.attachment.File.ContentType = contentType
switch mainType {
case mimeImage:
if extension == mimeGif {
p.attachment.Type = gtsmodel.FileTypeGif
} else {
p.attachment.Type = gtsmodel.FileTypeImage
}
default:
return fmt.Errorf("fetchRawData: cannot process mime type %s (yet)", mainType)
}
return nil
}
// putOrUpdateEmoji is just a convenience function for first trying to PUT the emoji in the database,
// and then if that doesn't work because the emoji already exists, updating it instead.
func putOrUpdateEmoji(ctx context.Context, database db.DB, emoji *gtsmodel.Emoji) error {
if err := database.Put(ctx, emoji); err != nil {
if err != db.ErrAlreadyExists {
return fmt.Errorf("putOrUpdateEmoji: proper error while putting emoji: %s", err)
}
if err := database.UpdateByPrimaryKey(ctx, emoji); err != nil {
return fmt.Errorf("putOrUpdateEmoji: error while updating emoji: %s", err)
}
}
return nil
}
func (m *manager) preProcessEmoji(ctx context.Context, data DataFunc, shortcode string, ai *AdditionalEmojiInfo) (*ProcessingEmoji, error) {
instanceAccount, err := m.db.GetInstanceAccount(ctx, "")
if err != nil {
return nil, fmt.Errorf("preProcessEmoji: error fetching this instance account from the db: %s", err)
}
id, err := id.NewRandomULID()
if err != nil {
return nil, err
}
// populate initial fields on the emoji -- some of these will be overwritten as we proceed
emoji := &gtsmodel.Emoji{
ID: id,
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
Shortcode: shortcode,
Domain: "", // assume our own domain unless told otherwise
ImageRemoteURL: "",
ImageStaticRemoteURL: "",
ImageURL: "", // we don't know yet
ImageStaticURL: uris.GenerateURIForAttachment(instanceAccount.ID, string(TypeEmoji), string(SizeStatic), id, mimePng), // all static emojis are encoded as png
ImagePath: "", // we don't know yet
ImageStaticPath: fmt.Sprintf("%s/%s/%s/%s.%s", instanceAccount.ID, TypeEmoji, SizeStatic, id, mimePng), // all static emojis are encoded as png
ImageContentType: "", // we don't know yet
ImageStaticContentType: mimeImagePng, // all static emojis are encoded as png
ImageFileSize: 0,
ImageStaticFileSize: 0,
ImageUpdatedAt: time.Now(),
Disabled: false,
URI: "", // we don't know yet
VisibleInPicker: true,
CategoryID: "",
}
// check if we have additional info to add to the emoji,
// and overwrite some of the emoji 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
}
}
processingEmoji := &ProcessingEmoji{
instanceAccountID: instanceAccount.ID,
emoji: emoji,
data: data,
staticState: received,
fullSizeState: received,
database: m.db,
storage: m.storage,
}
return processingEmoji, nil
}