mirror of
https://github.com/tmedwards/tweego.git
synced 2025-07-04 13:47:03 -04:00
ea69d81375
* Reduced the regexp by switching fully to ranges. * Switched replacement character to underscore. * Dropped lowercasing.
125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
/*
|
||
Copyright © 2014–2020 Thomas Michael Edwards. All rights reserved.
|
||
Use of this source code is governed by a Simplified BSD License which
|
||
can be found in the LICENSE file.
|
||
*/
|
||
|
||
package main
|
||
|
||
import (
|
||
"path/filepath"
|
||
"regexp"
|
||
"strings"
|
||
)
|
||
|
||
func mediaTypeFromFilename(filename string) string {
|
||
return mediaTypeFromExt(normalizedFileExt(filename))
|
||
}
|
||
|
||
func mediaTypeFromExt(ext string) string {
|
||
var mediaType string
|
||
switch ext {
|
||
// AUDIO NOTES:
|
||
//
|
||
// The preferred media type for WAVE audio is `audio/wave`, however,
|
||
// some browsers only recognize `audio/wav`, requiring its use instead.
|
||
case "aac", "flac", "ogg", "wav":
|
||
mediaType = "audio/" + ext
|
||
case "mp3":
|
||
mediaType = "audio/mpeg"
|
||
case "m4a":
|
||
mediaType = "audio/mp4"
|
||
case "oga", "opus":
|
||
mediaType = "audio/ogg"
|
||
case "wave":
|
||
mediaType = "audio/wav"
|
||
case "weba":
|
||
mediaType = "audio/webm"
|
||
|
||
// FONT NOTES:
|
||
//
|
||
// (ca. 2017) The IANA deprecated the various font subtypes of the
|
||
// "application" type in favor of the new "font" type. While the
|
||
// standards were new at that point, many browsers had long accepted
|
||
// such media types due to existing use in the wild—erroneous at
|
||
// that point or not.
|
||
// otf : application/font-sfnt → font/otf
|
||
// ttf : application/font-sfnt → font/ttf
|
||
// woff : application/font-woff → font/woff
|
||
// woff2 : application/font-woff2 → font/woff2
|
||
case "otf", "ttf", "woff", "woff2":
|
||
mediaType = "font/" + ext
|
||
|
||
// IMAGE NOTES:
|
||
case "gif", "jpeg", "png", "tiff", "webp":
|
||
mediaType = "image/" + ext
|
||
case "jpg":
|
||
mediaType = "image/jpeg"
|
||
case "svg":
|
||
mediaType = "image/svg+xml"
|
||
case "tif":
|
||
mediaType = "image/tiff"
|
||
|
||
// METADATA NOTES:
|
||
//
|
||
// Name aside, WebVTT files are generic media cue metadata files
|
||
// that may be used with either `<audio>` or `<video>` elements.
|
||
case "vtt": // WebVTT (Web Video Text Tracks)
|
||
mediaType = "text/vtt"
|
||
|
||
// VIDEO NOTES:
|
||
case "mp4", "webm":
|
||
mediaType = "video/" + ext
|
||
case "ogv":
|
||
mediaType = "video/ogg"
|
||
}
|
||
|
||
return mediaType
|
||
}
|
||
|
||
func normalizedFileExt(filename string) string {
|
||
ext := filepath.Ext(filename)
|
||
if ext == "" {
|
||
return ext
|
||
}
|
||
return strings.ToLower(ext[1:])
|
||
}
|
||
|
||
// Returns a trimmed and encoded slug of the passed string that should be safe
|
||
// for use as a DOM ID or class name.
|
||
func slugify(original string) string {
|
||
// NOTE: The range of illegal characters consists of: C0 controls, space, exclamation,
|
||
// double quote, number, dollar, percent, ampersand, single quote, left paren, right
|
||
// paren, asterisk, plus, comma, hyphen, period, forward slash, colon, semi-colon,
|
||
// less-than, equals, greater-than, question, at, left bracket, backslash, right
|
||
// bracket, caret, backquote/grave, left brace, pipe/vertical-bar, right brace, tilde,
|
||
// delete, C1 controls.
|
||
illegalRe := regexp.MustCompile(`[\x00-\x20!-/:-@[-^\x60{-\x9f]+`)
|
||
|
||
return illegalRe.ReplaceAllLiteralString(original, "_")
|
||
}
|
||
|
||
func stringSliceContains(haystack []string, needle string) bool {
|
||
if len(haystack) > 0 {
|
||
for _, val := range haystack {
|
||
if val == needle {
|
||
return true
|
||
}
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
func stringSliceDelete(haystack []string, needle string) []string {
|
||
if len(haystack) > 0 {
|
||
for i, val := range haystack {
|
||
if val == needle {
|
||
copy(haystack[i:], haystack[i+1:])
|
||
haystack[len(haystack)-1] = ""
|
||
haystack = haystack[:len(haystack)-1]
|
||
break
|
||
}
|
||
}
|
||
}
|
||
return haystack
|
||
}
|