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// Copyright 2010 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Package mime implements parts of the MIME spec.

package mime

import (

        "fmt"

        "strings"

        "sync"

)

var mimeTypes = map[string]string{

        ".css":  "text/css; charset=utf-8",

        ".gif":  "image/gif",

        ".htm":  "text/html; charset=utf-8",

        ".html": "text/html; charset=utf-8",

        ".jpg":  "image/jpeg",

        ".js":   "application/x-javascript",

        ".pdf":  "application/pdf",

        ".png":  "image/png",

        ".xml":  "text/xml; charset=utf-8",

}

var mimeLock sync.RWMutex

var once sync.Once

// TypeByExtension returns the MIME type associated with the file extension ext.

// The extension ext should begin with a leading dot, as in ".html".

// When ext has no associated type, TypeByExtension returns "".

//

// The built-in table is small but on unix it is augmented by the local

// system's mime.types file(s) if available under one or more of these

// names:

//

//   /etc/mime.types

//   /etc/apache2/mime.types

//   /etc/apache/mime.types

//

// Windows system mime types are extracted from registry.

//

// Text types have the charset parameter set to "utf-8" by default.

func TypeByExtension(ext string) string {

        once.Do(initMime)

        mimeLock.RLock()

        typename := mimeTypes[ext]

        mimeLock.RUnlock()

        return typename

}

// AddExtensionType sets the MIME type associated with

// the extension ext to typ.  The extension should begin with

// a leading dot, as in ".html".

func AddExtensionType(ext, typ string) error {

        if ext == "" || ext[0] != '.' {

                return fmt.Errorf(`mime: extension "%s" misses dot`, ext)

        }

        once.Do(initMime)

        return setExtensionType(ext, typ)

}

func setExtensionType(extension, mimeType string) error {

        _, param, err := ParseMediaType(mimeType)

        if err != nil {

                return err

        }

        if strings.HasPrefix(mimeType, "text/") && param["charset"] == "" {

                param["charset"] = "utf-8"

                mimeType = FormatMediaType(mimeType, param)

        }

        mimeLock.Lock()

        mimeTypes[extension] = mimeType

        mimeLock.Unlock()

        return nil

}