/**
takes a multipart file. Does not close it. creates a thumbnail and returns the file path
*/
func ThumbnailMultipart(file multipart.File, fileName string) (string, error) {
var (
err error
img image.Image
thumbImg *image.NRGBA
)
if _, err := file.Seek(0, 0); err != nil {
log.Printf("failed to seek to beginning of img " + err.Error())
return "", err
}
var thumbPath string = "/tmp/" + time.Now().String() + fileName
img, _, err = image.Decode(file)
if nil != err {
log.Printf("failed to decode img " + err.Error())
return "", err
}
thumbImg = imaging.Thumbnail(img, 300, 300, imaging.Lanczos)
out, err := os.Create(thumbPath)
if nil != err {
log.Printf("failed to create thumb path " + err.Error())
return "", err
}
defer out.Close()
// write new image to file
err = jpeg.Encode(out, thumbImg, nil)
return thumbPath, err
}
func Thumbnail(filePath string, fileName string) (string, error) {
var (
file *os.File
err error
img image.Image
thumbImg *image.NRGBA
)
file, err = os.Open(filePath)
if nil != err {
log.Printf("failed to decode img " + err.Error())
return "", err
}
var thumbPath string = "/tmp/" + time.Now().String() + fileName
img, _, err = image.Decode(file)
if nil != err {
log.Printf("failed to decode img " + err.Error())
return "", err
}
thumbImg = imaging.Thumbnail(img, 300, 300, imaging.Lanczos)
out, err := os.Create(thumbPath)
if nil != err {
log.Printf("failed to decode img " + err.Error())
return "", err
}
defer out.Close()
// write new image to file
err = jpeg.Encode(out, thumbImg, nil)
file.Close()
os.Remove(filePath)
return thumbPath, err
}