mirror of https://go.googlesource.com/go
127 lines
3.0 KiB
Go
127 lines
3.0 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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//go:build unix || (js && wasm) || wasip1
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package mime
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import (
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"bufio"
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"os"
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"strings"
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)
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func init() {
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osInitMime = initMimeUnix
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}
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// See https://specifications.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-0.21.html
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// for the FreeDesktop Shared MIME-info Database specification.
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var mimeGlobs = []string{
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"/usr/local/share/mime/globs2",
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"/usr/share/mime/globs2",
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}
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// Common locations for mime.types files on unix.
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var typeFiles = []string{
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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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"/etc/httpd/conf/mime.types",
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}
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func loadMimeGlobsFile(filename string) error {
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f, err := os.Open(filename)
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if err != nil {
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return err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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// Each line should be of format: weight:mimetype:glob[:morefields...]
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fields := strings.Split(scanner.Text(), ":")
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if len(fields) < 3 || len(fields[0]) < 1 || len(fields[2]) < 3 {
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continue
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} else if fields[0][0] == '#' || fields[2][0] != '*' || fields[2][1] != '.' {
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continue
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}
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extension := fields[2][1:]
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if strings.ContainsAny(extension, "?*[") {
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// Not a bare extension, but a glob. Ignore for now:
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// - we do not have an implementation for this glob
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// syntax (translation to path/filepath.Match could
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// be possible)
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// - support for globs with weight ordering would have
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// performance impact to all lookups to support the
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// rarely seen glob entries
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// - trying to match glob metacharacters literally is
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// not useful
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continue
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}
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if _, ok := mimeTypes.Load(extension); ok {
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// We've already seen this extension.
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// The file is in weight order, so we keep
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// the first entry that we see.
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continue
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}
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setExtensionType(extension, fields[1])
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}
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if err := scanner.Err(); err != nil {
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panic(err)
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}
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return nil
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}
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func loadMimeFile(filename string) {
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f, err := os.Open(filename)
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if err != nil {
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return
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if len(fields) <= 1 || fields[0][0] == '#' {
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continue
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}
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mimeType := fields[0]
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for _, ext := range fields[1:] {
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if ext[0] == '#' {
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break
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}
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setExtensionType("."+ext, mimeType)
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}
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}
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if err := scanner.Err(); err != nil {
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panic(err)
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}
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}
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func initMimeUnix() {
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for _, filename := range mimeGlobs {
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if err := loadMimeGlobsFile(filename); err == nil {
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return // Stop checking more files if mimetype database is found.
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}
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}
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// Fallback if no system-generated mimetype database exists.
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for _, filename := range typeFiles {
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loadMimeFile(filename)
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}
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}
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func initMimeForTests() map[string]string {
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mimeGlobs = []string{""}
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typeFiles = []string{"testdata/test.types"}
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return map[string]string{
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".T1": "application/test",
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".t2": "text/test; charset=utf-8",
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".png": "image/png",
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}
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}
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