mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-01 06:50:00 +00:00
280 lines
6.8 KiB
Go
280 lines
6.8 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package media
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"image"
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"image/gif"
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"image/jpeg"
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"image/png"
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"strings"
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"time"
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"github.com/buckket/go-blurhash"
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"github.com/nfnt/resize"
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"github.com/superseriousbusiness/exifremove/pkg/exifremove"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/id"
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"github.com/superseriousbusiness/gotosocial/internal/uris"
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)
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const (
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thumbnailMaxWidth = 512
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thumbnailMaxHeight = 512
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)
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type ImageMeta struct {
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image []byte
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contentType string
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width int
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height int
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size int
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aspect float64
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blurhash string
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}
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func (m *manager) preProcessImage(ctx context.Context, data []byte, contentType string, accountID string) (*Media, error) {
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if !supportedImage(contentType) {
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return nil, fmt.Errorf("image type %s not supported", contentType)
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}
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if len(data) == 0 {
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return nil, errors.New("image was of size 0")
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}
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id, err := id.NewRandomULID()
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if err != nil {
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return nil, err
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}
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extension := strings.Split(contentType, "/")[1]
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attachment := >smodel.MediaAttachment{
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ID: id,
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UpdatedAt: time.Now(),
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URL: uris.GenerateURIForAttachment(accountID, string(TypeAttachment), string(SizeOriginal), id, extension),
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Type: gtsmodel.FileTypeImage,
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AccountID: accountID,
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Processing: 0,
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File: gtsmodel.File{
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Path: fmt.Sprintf("%s/%s/%s/%s.%s", accountID, TypeAttachment, SizeOriginal, id, extension),
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ContentType: contentType,
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UpdatedAt: time.Now(),
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},
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Thumbnail: gtsmodel.Thumbnail{
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URL: uris.GenerateURIForAttachment(accountID, string(TypeAttachment), string(SizeSmall), id, mimeJpeg), // all thumbnails are encoded as jpeg,
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Path: fmt.Sprintf("%s/%s/%s/%s.%s", accountID, TypeAttachment, SizeSmall, id, mimeJpeg), // all thumbnails are encoded as jpeg,
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ContentType: mimeJpeg,
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UpdatedAt: time.Now(),
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},
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Avatar: false,
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Header: false,
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}
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media := &Media{
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attachment: attachment,
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}
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return media, nil
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var clean []byte
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var original *ImageMeta
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var small *ImageMeta
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if err != nil {
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return nil, err
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}
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small, err = deriveThumbnail(clean, contentType)
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if err != nil {
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return nil, fmt.Errorf("error deriving thumbnail: %s", err)
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}
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// now put it in storage, take a new id for the name of the file so we don't store any unnecessary info about it
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return attachment, nil
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}
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func decodeGif(b []byte) (*ImageMeta, error) {
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gif, err := gif.DecodeAll(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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// use the first frame to get the static characteristics
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width := gif.Config.Width
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height := gif.Config.Height
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size := width * height
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aspect := float64(width) / float64(height)
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return &ImageMeta{
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image: b,
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width: width,
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height: height,
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size: size,
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aspect: aspect,
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}, nil
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}
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func decodeImage(b []byte, contentType string) (*ImageMeta, error) {
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var i image.Image
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var err error
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switch contentType {
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case mimeImageJpeg:
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i, err = jpeg.Decode(bytes.NewReader(b))
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case mimeImagePng:
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i, err = png.Decode(bytes.NewReader(b))
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default:
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err = fmt.Errorf("content type %s not recognised", contentType)
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}
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if err != nil {
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return nil, err
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}
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if i == nil {
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return nil, errors.New("processed image was nil")
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}
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width := i.Bounds().Size().X
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height := i.Bounds().Size().Y
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size := width * height
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aspect := float64(width) / float64(height)
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return &ImageMeta{
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image: b,
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width: width,
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height: height,
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size: size,
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aspect: aspect,
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}, nil
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}
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// deriveThumbnail returns a byte slice and metadata for a thumbnail
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// of a given jpeg, png, or gif, or an error if something goes wrong.
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//
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// Note that the aspect ratio of the image will be retained,
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// so it will not necessarily be a square, even if x and y are set as the same value.
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func deriveThumbnail(b []byte, contentType string) (*ImageMeta, error) {
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var i image.Image
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var err error
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switch contentType {
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case mimeImageJpeg:
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i, err = jpeg.Decode(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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case mimeImagePng:
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i, err = png.Decode(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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case mimeImageGif:
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i, err = gif.Decode(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("content type %s not recognised", contentType)
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}
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thumb := resize.Thumbnail(thumbnailMaxWidth, thumbnailMaxHeight, i, resize.NearestNeighbor)
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width := thumb.Bounds().Size().X
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height := thumb.Bounds().Size().Y
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size := width * height
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aspect := float64(width) / float64(height)
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tiny := resize.Thumbnail(32, 32, thumb, resize.NearestNeighbor)
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bh, err := blurhash.Encode(4, 3, tiny)
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if err != nil {
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return nil, err
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}
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out := &bytes.Buffer{}
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if err := jpeg.Encode(out, thumb, &jpeg.Options{
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Quality: 75,
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}); err != nil {
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return nil, err
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}
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return &ImageMeta{
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image: out.Bytes(),
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width: width,
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height: height,
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size: size,
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aspect: aspect,
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blurhash: bh,
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}, nil
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}
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// deriveStaticEmojji takes a given gif or png of an emoji, decodes it, and re-encodes it as a static png.
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func deriveStaticEmoji(b []byte, contentType string) (*ImageMeta, error) {
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var i image.Image
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var err error
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switch contentType {
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case mimeImagePng:
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i, err = png.Decode(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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case mimeImageGif:
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i, err = gif.Decode(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("content type %s not allowed for emoji", contentType)
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}
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out := &bytes.Buffer{}
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if err := png.Encode(out, i); err != nil {
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return nil, err
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}
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return &ImageMeta{
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image: out.Bytes(),
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}, nil
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}
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// purgeExif is a little wrapper for the action of removing exif data from an image.
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// Only pass pngs or jpegs to this function.
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func purgeExif(data []byte) ([]byte, error) {
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if len(data) == 0 {
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return nil, errors.New("passed image was not valid")
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}
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clean, err := exifremove.Remove(data)
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if err != nil {
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return nil, fmt.Errorf("could not purge exif from image: %s", err)
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}
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if len(clean) == 0 {
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return nil, errors.New("purged image was not valid")
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}
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return clean, nil
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}
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