gotosocial/internal/media/media.go
Tobi Smethurst 742f985d5b
Mediahandler (#21)
Media GET and media PUT handlers
2021-05-10 16:29:05 +02:00

508 lines
18 KiB
Go

/*
GoToSocial
Copyright (C) 2021 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 (
"errors"
"fmt"
"strings"
"time"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/storage"
)
// Size describes the *size* of a piece of media
type Size string
// Type describes the *type* of a piece of media
type Type string
const (
// Small is the key for small/thumbnail versions of media
Small Size = "small"
// Original is the key for original/fullsize versions of media and emoji
Original Size = "original"
// Static is the key for static (non-animated) versions of emoji
Static Size = "static"
// Attachment is the key for media attachments
Attachment Type = "attachment"
// Header is the key for profile header requests
Header Type = "header"
// Avatar is the key for profile avatar requests
Avatar Type = "avatar"
// Emoji is the key for emoji type requests
Emoji Type = "emoji"
// EmojiMaxBytes is the maximum permitted bytes of an emoji upload (50kb)
EmojiMaxBytes = 51200
)
// Handler provides an interface for parsing, storing, and retrieving media objects like photos, videos, and gifs.
type Handler interface {
// ProcessHeaderOrAvatar takes a new header image for an account, checks it out, removes exif data from it,
// puts it in whatever storage backend we're using, sets the relevant fields in the database for the new image,
// and then returns information to the caller about the new header.
ProcessHeaderOrAvatar(img []byte, accountID string, mediaType Type) (*gtsmodel.MediaAttachment, error)
// ProcessLocalAttachment takes a new attachment and the requesting account, checks it out, removes exif data from it,
// puts it in whatever storage backend we're using, sets the relevant fields in the database for the new media,
// and then returns information to the caller about the attachment.
ProcessLocalAttachment(attachment []byte, accountID string) (*gtsmodel.MediaAttachment, error)
// ProcessLocalEmoji takes a new emoji and a shortcode, cleans it up, puts it in storage, and creates a new
// *gts.Emoji for it, then returns it to the caller. It's the caller's responsibility to put the returned struct
// in the database.
ProcessLocalEmoji(emojiBytes []byte, shortcode string) (*gtsmodel.Emoji, error)
}
type mediaHandler struct {
config *config.Config
db db.DB
storage storage.Storage
log *logrus.Logger
}
// New returns a new handler with the given config, db, storage, and logger
func New(config *config.Config, database db.DB, storage storage.Storage, log *logrus.Logger) Handler {
return &mediaHandler{
config: config,
db: database,
storage: storage,
log: log,
}
}
/*
INTERFACE FUNCTIONS
*/
// ProcessHeaderOrAvatar takes a new header image for an account, checks it out, removes exif data from it,
// puts it in whatever storage backend we're using, sets the relevant fields in the database for the new image,
// and then returns information to the caller about the new header.
func (mh *mediaHandler) ProcessHeaderOrAvatar(attachment []byte, accountID string, mediaType Type) (*gtsmodel.MediaAttachment, error) {
l := mh.log.WithField("func", "SetHeaderForAccountID")
if mediaType != Header && mediaType != Avatar {
return nil, errors.New("header or avatar not selected")
}
// make sure we have a type we can handle
contentType, err := parseContentType(attachment)
if err != nil {
return nil, err
}
if !SupportedImageType(contentType) {
return nil, fmt.Errorf("%s is not an accepted image type", contentType)
}
if len(attachment) == 0 {
return nil, fmt.Errorf("passed reader was of size 0")
}
l.Tracef("read %d bytes of file", len(attachment))
// process it
ma, err := mh.processHeaderOrAvi(attachment, contentType, mediaType, accountID)
if err != nil {
return nil, fmt.Errorf("error processing %s: %s", mediaType, err)
}
// set it in the database
if err := mh.db.SetHeaderOrAvatarForAccountID(ma, accountID); err != nil {
return nil, fmt.Errorf("error putting %s in database: %s", mediaType, err)
}
return ma, nil
}
// ProcessLocalAttachment takes a new attachment and the requesting account, checks it out, removes exif data from it,
// puts it in whatever storage backend we're using, sets the relevant fields in the database for the new media,
// and then returns information to the caller about the attachment.
func (mh *mediaHandler) ProcessLocalAttachment(attachment []byte, accountID string) (*gtsmodel.MediaAttachment, error) {
contentType, err := parseContentType(attachment)
if err != nil {
return nil, err
}
mainType := strings.Split(contentType, "/")[0]
switch mainType {
case MIMEVideo:
if !SupportedVideoType(contentType) {
return nil, fmt.Errorf("video type %s not supported", contentType)
}
if len(attachment) == 0 {
return nil, errors.New("video was of size 0")
}
if len(attachment) > mh.config.MediaConfig.MaxVideoSize {
return nil, fmt.Errorf("video size %d bytes exceeded max video size of %d bytes", len(attachment), mh.config.MediaConfig.MaxVideoSize)
}
return mh.processVideoAttachment(attachment, accountID, contentType)
case MIMEImage:
if !SupportedImageType(contentType) {
return nil, fmt.Errorf("image type %s not supported", contentType)
}
if len(attachment) == 0 {
return nil, errors.New("image was of size 0")
}
if len(attachment) > mh.config.MediaConfig.MaxImageSize {
return nil, fmt.Errorf("image size %d bytes exceeded max image size of %d bytes", len(attachment), mh.config.MediaConfig.MaxImageSize)
}
return mh.processImageAttachment(attachment, accountID, contentType)
default:
break
}
return nil, fmt.Errorf("content type %s not (yet) supported", contentType)
}
// ProcessLocalEmoji takes a new emoji and a shortcode, cleans it up, puts it in storage, and creates a new
// *gts.Emoji for it, then returns it to the caller. It's the caller's responsibility to put the returned struct
// in the database.
func (mh *mediaHandler) ProcessLocalEmoji(emojiBytes []byte, shortcode string) (*gtsmodel.Emoji, error) {
var clean []byte
var err error
var original *imageAndMeta
var static *imageAndMeta
// check content type of the submitted emoji and make sure it's supported by us
contentType, err := parseContentType(emojiBytes)
if err != nil {
return nil, err
}
if !supportedEmojiType(contentType) {
return nil, fmt.Errorf("content type %s not supported for emojis", contentType)
}
if len(emojiBytes) == 0 {
return nil, errors.New("emoji was of size 0")
}
if len(emojiBytes) > EmojiMaxBytes {
return nil, fmt.Errorf("emoji size %d bytes exceeded max emoji size of %d bytes", len(emojiBytes), EmojiMaxBytes)
}
// clean any exif data from png but leave gifs alone
switch contentType {
case MIMEPng:
if clean, err = purgeExif(emojiBytes); err != nil {
return nil, fmt.Errorf("error cleaning exif data: %s", err)
}
case MIMEGif:
clean = emojiBytes
default:
return nil, errors.New("media type unrecognized")
}
// unlike with other attachments we don't need to derive anything here because we don't care about the width/height etc
original = &imageAndMeta{
image: clean,
}
static, err = deriveStaticEmoji(clean, contentType)
if err != nil {
return nil, fmt.Errorf("error deriving static emoji: %s", err)
}
// since emoji aren't 'owned' by an account, but we still want to use the same pattern for serving them through the filserver,
// (ie., fileserver/ACCOUNT_ID/etc etc) we need to fetch the INSTANCE ACCOUNT from the database. That is, the account that's created
// with the same username as the instance hostname, which doesn't belong to any particular user.
instanceAccount := &gtsmodel.Account{}
if err := mh.db.GetLocalAccountByUsername(mh.config.Host, instanceAccount); err != nil {
return nil, fmt.Errorf("error fetching instance account: %s", err)
}
// the file extension (either png or gif)
extension := strings.Split(contentType, "/")[1]
// create the urls and storage paths
URLbase := fmt.Sprintf("%s://%s%s", mh.config.StorageConfig.ServeProtocol, mh.config.StorageConfig.ServeHost, mh.config.StorageConfig.ServeBasePath)
// generate a uuid for the new emoji -- normally we could let the database do this for us,
// but we need it below so we should create it here instead.
newEmojiID := uuid.NewString()
// webfinger uri for the emoji -- unrelated to actually serving the image
// will be something like https://example.org/emoji/70a7f3d7-7e35-4098-8ce3-9b5e8203bb9c
emojiURI := fmt.Sprintf("%s://%s/%s/%s", mh.config.Protocol, mh.config.Host, Emoji, newEmojiID)
// serve url and storage path for the original emoji -- can be png or gif
emojiURL := fmt.Sprintf("%s/%s/%s/%s/%s.%s", URLbase, instanceAccount.ID, Emoji, Original, newEmojiID, extension)
emojiPath := fmt.Sprintf("%s/%s/%s/%s/%s.%s", mh.config.StorageConfig.BasePath, instanceAccount.ID, Emoji, Original, newEmojiID, extension)
// serve url and storage path for the static version -- will always be png
emojiStaticURL := fmt.Sprintf("%s/%s/%s/%s/%s.png", URLbase, instanceAccount.ID, Emoji, Static, newEmojiID)
emojiStaticPath := fmt.Sprintf("%s/%s/%s/%s/%s.png", mh.config.StorageConfig.BasePath, instanceAccount.ID, Emoji, Static, newEmojiID)
// store the original
if err := mh.storage.StoreFileAt(emojiPath, original.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
// store the static
if err := mh.storage.StoreFileAt(emojiStaticPath, static.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
// and finally return the new emoji data to the caller -- it's up to them what to do with it
e := &gtsmodel.Emoji{
ID: newEmojiID,
Shortcode: shortcode,
Domain: "", // empty because this is a local emoji
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
ImageRemoteURL: "", // empty because this is a local emoji
ImageStaticRemoteURL: "", // empty because this is a local emoji
ImageURL: emojiURL,
ImageStaticURL: emojiStaticURL,
ImagePath: emojiPath,
ImageStaticPath: emojiStaticPath,
ImageContentType: contentType,
ImageStaticContentType: MIMEPng, // static version will always be a png
ImageFileSize: len(original.image),
ImageStaticFileSize: len(static.image),
ImageUpdatedAt: time.Now(),
Disabled: false,
URI: emojiURI,
VisibleInPicker: true,
CategoryID: "", // empty because this is a new emoji -- no category yet
}
return e, nil
}
/*
HELPER FUNCTIONS
*/
func (mh *mediaHandler) processVideoAttachment(data []byte, accountID string, contentType string) (*gtsmodel.MediaAttachment, error) {
return nil, nil
}
func (mh *mediaHandler) processImageAttachment(data []byte, accountID string, contentType string) (*gtsmodel.MediaAttachment, error) {
var clean []byte
var err error
var original *imageAndMeta
var small *imageAndMeta
switch contentType {
case MIMEJpeg, MIMEPng:
if clean, err = purgeExif(data); err != nil {
return nil, fmt.Errorf("error cleaning exif data: %s", err)
}
original, err = deriveImage(clean, contentType)
if err != nil {
return nil, fmt.Errorf("error parsing image: %s", err)
}
case MIMEGif:
clean = data
original, err = deriveGif(clean, contentType)
if err != nil {
return nil, fmt.Errorf("error parsing gif: %s", err)
}
default:
return nil, errors.New("media type unrecognized")
}
small, err = deriveThumbnail(clean, contentType, 256, 256)
if err != nil {
return nil, fmt.Errorf("error deriving thumbnail: %s", err)
}
// now put it in storage, take a new uuid for the name of the file so we don't store any unnecessary info about it
extension := strings.Split(contentType, "/")[1]
newMediaID := uuid.NewString()
URLbase := fmt.Sprintf("%s://%s%s", mh.config.StorageConfig.ServeProtocol, mh.config.StorageConfig.ServeHost, mh.config.StorageConfig.ServeBasePath)
originalURL := fmt.Sprintf("%s/%s/attachment/original/%s.%s", URLbase, accountID, newMediaID, extension)
smallURL := fmt.Sprintf("%s/%s/attachment/small/%s.jpeg", URLbase, accountID, newMediaID) // all thumbnails/smalls are encoded as jpeg
// we store the original...
originalPath := fmt.Sprintf("%s/%s/%s/%s/%s.%s", mh.config.StorageConfig.BasePath, accountID, Attachment, Original, newMediaID, extension)
if err := mh.storage.StoreFileAt(originalPath, original.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
// and a thumbnail...
smallPath := fmt.Sprintf("%s/%s/%s/%s/%s.jpeg", mh.config.StorageConfig.BasePath, accountID, Attachment, Small, newMediaID) // all thumbnails/smalls are encoded as jpeg
if err := mh.storage.StoreFileAt(smallPath, small.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
ma := &gtsmodel.MediaAttachment{
ID: newMediaID,
StatusID: "",
URL: originalURL,
RemoteURL: "",
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
Type: gtsmodel.FileTypeImage,
FileMeta: gtsmodel.FileMeta{
Original: gtsmodel.Original{
Width: original.width,
Height: original.height,
Size: original.size,
Aspect: original.aspect,
},
Small: gtsmodel.Small{
Width: small.width,
Height: small.height,
Size: small.size,
Aspect: small.aspect,
},
},
AccountID: accountID,
Description: "",
ScheduledStatusID: "",
Blurhash: original.blurhash,
Processing: 2,
File: gtsmodel.File{
Path: originalPath,
ContentType: contentType,
FileSize: len(original.image),
UpdatedAt: time.Now(),
},
Thumbnail: gtsmodel.Thumbnail{
Path: smallPath,
ContentType: MIMEJpeg, // all thumbnails/smalls are encoded as jpeg
FileSize: len(small.image),
UpdatedAt: time.Now(),
URL: smallURL,
RemoteURL: "",
},
Avatar: false,
Header: false,
}
return ma, nil
}
func (mh *mediaHandler) processHeaderOrAvi(imageBytes []byte, contentType string, mediaType Type, accountID string) (*gtsmodel.MediaAttachment, error) {
var isHeader bool
var isAvatar bool
switch mediaType {
case Header:
isHeader = true
case Avatar:
isAvatar = true
default:
return nil, errors.New("header or avatar not selected")
}
var clean []byte
var err error
var original *imageAndMeta
switch contentType {
case MIMEJpeg:
if clean, err = purgeExif(imageBytes); err != nil {
return nil, fmt.Errorf("error cleaning exif data: %s", err)
}
original, err = deriveImage(clean, contentType)
case MIMEPng:
if clean, err = purgeExif(imageBytes); err != nil {
return nil, fmt.Errorf("error cleaning exif data: %s", err)
}
original, err = deriveImage(clean, contentType)
case MIMEGif:
clean = imageBytes
original, err = deriveGif(clean, contentType)
default:
return nil, errors.New("media type unrecognized")
}
if err != nil {
return nil, fmt.Errorf("error parsing image: %s", err)
}
small, err := deriveThumbnail(clean, contentType, 256, 256)
if err != nil {
return nil, fmt.Errorf("error deriving thumbnail: %s", err)
}
// now put it in storage, take a new uuid for the name of the file so we don't store any unnecessary info about it
extension := strings.Split(contentType, "/")[1]
newMediaID := uuid.NewString()
URLbase := fmt.Sprintf("%s://%s%s", mh.config.StorageConfig.ServeProtocol, mh.config.StorageConfig.ServeHost, mh.config.StorageConfig.ServeBasePath)
originalURL := fmt.Sprintf("%s/%s/%s/original/%s.%s", URLbase, accountID, mediaType, newMediaID, extension)
smallURL := fmt.Sprintf("%s/%s/%s/small/%s.%s", URLbase, accountID, mediaType, newMediaID, extension)
// we store the original...
originalPath := fmt.Sprintf("%s/%s/%s/%s/%s.%s", mh.config.StorageConfig.BasePath, accountID, mediaType, Original, newMediaID, extension)
if err := mh.storage.StoreFileAt(originalPath, original.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
// and a thumbnail...
smallPath := fmt.Sprintf("%s/%s/%s/%s/%s.%s", mh.config.StorageConfig.BasePath, accountID, mediaType, Small, newMediaID, extension)
if err := mh.storage.StoreFileAt(smallPath, small.image); err != nil {
return nil, fmt.Errorf("storage error: %s", err)
}
ma := &gtsmodel.MediaAttachment{
ID: newMediaID,
StatusID: "",
URL: originalURL,
RemoteURL: "",
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
Type: gtsmodel.FileTypeImage,
FileMeta: gtsmodel.FileMeta{
Original: gtsmodel.Original{
Width: original.width,
Height: original.height,
Size: original.size,
Aspect: original.aspect,
},
Small: gtsmodel.Small{
Width: small.width,
Height: small.height,
Size: small.size,
Aspect: small.aspect,
},
},
AccountID: accountID,
Description: "",
ScheduledStatusID: "",
Blurhash: original.blurhash,
Processing: 2,
File: gtsmodel.File{
Path: originalPath,
ContentType: contentType,
FileSize: len(original.image),
UpdatedAt: time.Now(),
},
Thumbnail: gtsmodel.Thumbnail{
Path: smallPath,
ContentType: contentType,
FileSize: len(small.image),
UpdatedAt: time.Now(),
URL: smallURL,
RemoteURL: "",
},
Avatar: isAvatar,
Header: isHeader,
}
return ma, nil
}