78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
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package utils
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import (
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"bufio"
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"errors"
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"fmt"
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"mime"
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"os"
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"path/filepath"
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"strings"
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"sync"
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)
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var _ = fmt.Print
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var user_mime_only_once sync.Once
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var user_defined_mime_map map[string]string
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func load_mime_file(filename string, mime_map map[string]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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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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mime_type := 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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mime_map["."+ext] = mime_type
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}
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}
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if err := scanner.Err(); err != nil {
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return err
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}
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return nil
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}
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func load_user_mime_maps() {
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conf_path := filepath.Join(ConfigDir(), "mime.types")
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err := load_mime_file(conf_path, user_defined_mime_map)
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if err != nil && !errors.Is(err, os.ErrNotExist) {
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fmt.Fprintln(os.Stderr, "Failed to parse", conf_path, "for MIME types with error:", err)
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}
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}
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func GuessMimeType(filename string) string {
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user_mime_only_once.Do(load_user_mime_maps)
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ext := filepath.Ext(filename)
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mime_with_parameters := user_defined_mime_map[ext]
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if mime_with_parameters == "" {
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mime_with_parameters = mime.TypeByExtension(ext)
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}
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if mime_with_parameters == "" {
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only_once.Do(set_builtins)
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mime_with_parameters = builtin_types_map[ext]
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if mime_with_parameters == "" {
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mime_with_parameters = builtin_types_map[strings.ToLower(ext)]
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if mime_with_parameters == "" {
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return ""
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}
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}
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}
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ans, _, err := mime.ParseMediaType(mime_with_parameters)
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if err != nil {
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return ""
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}
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return ans
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}
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