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provider.go
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/
provider.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"image"
"io"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
_ "golang.org/x/image/bmp"
_ "golang.org/x/image/tiff"
_ "golang.org/x/image/vp8l"
_ "golang.org/x/image/webp"
)
type ImageSize struct {
}
type Size struct {
Width int `json:"width"`
Height int `json:"height"`
}
func (is *ImageSize) MinimumBytes(typ, subtyp string) (int64, error) {
if typ != "image" {
return 0, errors.New("Not an image")
}
// TODO: 1024 is an assumption here, ideally check with most of the more popular image formats
return 1024, nil
}
func (is *ImageSize) Check(filename string, reader io.Reader) ([]byte, error) {
cfg, _, err := image.DecodeConfig(reader)
if err != nil {
return nil, err
}
out := Size{Width: cfg.Width, Height: cfg.Height}
return json.Marshal(out)
}
func (is *ImageSize) Render(data []byte) (string, string, error) {
var cfg Size
err := json.Unmarshal(data, &cfg)
if err != nil {
return "", "", err
}
return fmt.Sprintf("height: %d, width: %d", cfg.Height, cfg.Width), "Image Size", nil
}