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package themagicpipe
import (
"os/exec"
"strings"
"errors"
)
// Where the magic happens, the base64 data url image is sent through Imagemagick
// and converted to indexed colors 400x200 png
func DataURLConverter(dataURL string) (string, error) {
if !strings.HasPrefix(dataURL, "data:image/png;base64,") {
return "", errors.New("invalid dataURL")
}
cmd := "base64 -d | convert - -background white -flatten -resize 400x200! -colors 4 PNG8:- | base64 -w0"
converter := exec.Command("sh","-c",cmd)
converter.Stdin = strings.NewReader(strings.TrimPrefix(dataURL, "data:image/png;base64,"))
output, err := converter.Output()
if err != nil {
return "", err
}
return "data:image/png;base64,"+string(output), nil
}
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