85 lines
2 KiB
Go
85 lines
2 KiB
Go
package mediaprovider
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import (
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"bytes"
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"encoding/base64"
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"errors"
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"image"
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"image/jpeg"
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"image/png"
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"io"
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"strings"
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"github.com/gabriel-vasile/mimetype"
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"github.com/gen2brain/avif"
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"golang.org/x/image/draw"
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"golang.org/x/image/webp"
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)
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var ErrUnknownImageType = errors.New("unknown image format")
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func Compress(dataReader io.Reader, mimeType *string) (io.Reader, error) {
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data, err := io.ReadAll(dataReader)
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if err != nil {
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return nil, err
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}
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if mimeType == nil {
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*mimeType = mimetype.Detect(data).String()
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}
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uberType, subType, _ := strings.Cut(*mimeType, "/")
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var dataOut []byte
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switch uberType {
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case "text":
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case "application":
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case "image":
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dataOut, err = compressImage(data, subType, 1280, 720)
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case "video":
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dataOut, err = compressVideo(data, subType)
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case "audio":
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case "font":
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default:
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}
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if err != nil && err != ErrUnknownImageType {
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return nil, err
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}
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dataOut = compressBase64(dataOut)
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return bytes.NewReader(dataOut), nil
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}
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func compressVideo(dataIn []byte, subType string) (dataOut []byte, err error) {
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// TODO: Implement me
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panic("Implement me")
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}
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func compressImage(dataIn []byte, subType string, maxSizeX, maxSizeY uint) (dataOut []byte, err error) {
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imageSize := image.Rect(0, 0, int(maxSizeX), int(maxSizeY))
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dst := image.NewRGBA(imageSize)
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var sourceImage image.Image
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switch subType {
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case "png":
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sourceImage, err = png.Decode(bytes.NewReader(dataIn))
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if err != nil {
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return nil, err
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}
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case "jpg", "jpeg":
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sourceImage, err = jpeg.Decode(bytes.NewReader(dataIn))
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case "webp":
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sourceImage, err = webp.Decode(bytes.NewReader(dataIn))
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case "avif":
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sourceImage, err = avif.Decode(bytes.NewReader(dataIn))
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default:
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return nil, ErrUnknownImageType
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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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draw.CatmullRom.Scale(dst, imageSize, sourceImage, sourceImage.Bounds(), draw.Src, nil)
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return dst.Pix, nil
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}
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func compressBase64(dataIn []byte) []byte {
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result := []byte{}
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base64.StdEncoding.Encode(result, dataIn)
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return result
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}
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