Function DetectImageMediaType

models/image.go:74–79

DetectImageMediaType sniffs the media type from the leading bytes and reports whether it is a supported image. Used when an attachment has no declared MIME (local file read, raw paste).

(data []byte)

// reports whether it is a supported image. Used when an attachment has
// no declared MIME (local file read, raw paste).
func DetectImageMediaType(data []byte) (string, bool) {
	if len(data) == 0 {
		return "", false
	}
	return NormalizeImageMediaType(http.DetectContentType(data))
}

// IsValid reports whether the image carries usable bytes (Data or URL)
// and a supported media type.