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mime.go
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mime.go
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// Copyright 2018-2021 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package mime
import (
"path"
"sync"
gomime "github.com/cubewise-code/go-mime"
)
const defaultMimeDir = "httpd/unix-directory"
var mimes sync.Map
func init() {
mimes = sync.Map{}
}
// RegisterMime is a package level function that registers
// a mime type with the given extension.
// TODO(labkode): check that we do not override mime type mappings?
func RegisterMime(ext, mime string) {
mimes.Store(ext, mime)
}
// Detect returns the mimetype associated with the given filename.
func Detect(isDir bool, fn string) string {
if isDir {
return defaultMimeDir
}
ext := path.Ext(fn)
mimeType := getCustomMime(ext)
if mimeType == "" {
mimeType = gomime.TypeByExtension(ext)
}
if mimeType == "" {
mimeType = "application/octet-stream"
}
return mimeType
}
func getCustomMime(ext string) string {
if m, ok := mimes.Load(ext); ok {
return m.(string)
}
return ""
}