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78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package mime implements parts of the MIME spec.
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package mime
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import (
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"fmt"
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"strings"
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"sync"
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)
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var mimeTypes = map[string]string{
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".css": "text/css; charset=utf-8",
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".gif": "image/gif",
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".htm": "text/html; charset=utf-8",
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".html": "text/html; charset=utf-8",
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".jpg": "image/jpeg",
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".js": "application/x-javascript",
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".pdf": "application/pdf",
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".png": "image/png",
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".xml": "text/xml; charset=utf-8",
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}
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var mimeLock sync.RWMutex
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var once sync.Once
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// TypeByExtension returns the MIME type associated with the file extension ext.
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// The extension ext should begin with a leading dot, as in ".html".
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// When ext has no associated type, TypeByExtension returns "".
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//
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// The built-in table is small but on unix it is augmented by the local
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// system's mime.types file(s) if available under one or more of these
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// names:
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//
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// /etc/mime.types
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// /etc/apache2/mime.types
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// /etc/apache/mime.types
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//
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// Windows system mime types are extracted from registry.
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//
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// Text types have the charset parameter set to "utf-8" by default.
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func TypeByExtension(ext string) string {
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once.Do(initMime)
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mimeLock.RLock()
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typename := mimeTypes[ext]
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mimeLock.RUnlock()
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return typename
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}
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// AddExtensionType sets the MIME type associated with
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// the extension ext to typ. The extension should begin with
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// a leading dot, as in ".html".
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func AddExtensionType(ext, typ string) error {
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if ext == "" || ext[0] != '.' {
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return fmt.Errorf(`mime: extension "%s" misses dot`, ext)
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}
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once.Do(initMime)
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return setExtensionType(ext, typ)
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}
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func setExtensionType(extension, mimeType string) error {
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_, param, err := ParseMediaType(mimeType)
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if err != nil {
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return err
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}
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if strings.HasPrefix(mimeType, "text/") && param["charset"] == "" {
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param["charset"] = "utf-8"
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mimeType = FormatMediaType(mimeType, param)
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}
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mimeLock.Lock()
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mimeTypes[extension] = mimeType
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mimeLock.Unlock()
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return nil
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}
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