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// Copyright (c) 2022 Sumner Evans
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package util
import (
"mime"
"strings"
)
// MimeExtensionSanityOverrides includes extensions for various common mimetypes.
//
// This is necessary because sometimes the OS mimetype database and Go interact in weird ways,
// which causes very obscure extensions to be first in the array for common mimetypes
// (e.g. image/jpeg -> .jpe, text/plain -> ,v).
var MimeExtensionSanityOverrides = map[string]string{
"image/png": ".png",
"image/webp": ".webp",
"image/jpeg": ".jpg",
"image/tiff": ".tiff",
"image/heif": ".heic",
"image/heic": ".heic",
"audio/mpeg": ".mp3",
"audio/ogg": ".ogg",
"audio/webm": ".webm",
"audio/x-caf": ".caf",
"video/mp4": ".mp4",
"video/mpeg": ".mpeg",
"video/webm": ".webm",
"text/plain": ".txt",
"text/html": ".html",
"application/xml": ".xml",
}
func ExtensionFromMimetype(mimetype string) string {
ext, ok := MimeExtensionSanityOverrides[strings.Split(mimetype, ";")[0]]
if !ok {
exts, _ := mime.ExtensionsByType(mimetype)
if len(exts) > 0 {
ext = exts[0]
}
}
return ext
}
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