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assetid.go
139 lines (122 loc) · 3.08 KB
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assetid.go
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/**
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
package assetid
import (
"errors"
"fmt"
"path/filepath"
"strings"
"github.com/gauntface/go-html-asset-manager/v5/assets"
)
const (
inlinePrefix = "-inline"
syncPrefix = "-sync"
asyncPrefix = "-async"
preloadPrefix = "-preload"
)
var (
prefixesToTrim = []string{
inlinePrefix,
syncPrefix,
asyncPrefix,
preloadPrefix,
}
mediaValues = []string{
"print",
"screen",
"aural",
"braille",
}
ErrUnknownType = errors.New("unknown asset type")
)
func Generate(path string) string {
// Initialise ID to just the filename
id, _, ext := filename(path)
switch ext {
case ".css", ".js":
for _, pr := range prefixesToTrim {
if strings.HasSuffix(id, pr) {
id = strings.TrimSuffix(id, pr)
break
}
}
}
return id
}
func IdentifyType(path string) (assets.Type, string, error) {
fn, media, ext := filename(path)
t, err := assetType(fn, media, ext)
return t, media, err
}
func assetType(fn, media, ext string) (assets.Type, error) {
switch ext {
case ".css":
return typeFromSyncSet(fn, media, assets.InlineCSS, assets.SyncCSS, assets.AsyncCSS, assets.PreloadCSS), nil
case ".js":
return typeFromSyncSet(fn, media, assets.InlineJS, assets.SyncJS, assets.AsyncJS, assets.PreloadJS), nil
case ".json":
return assets.JSON, nil
case ".html":
return assets.HTML, nil
case ".png":
return assets.PNG, nil
case ".jpg", ".jpeg":
return assets.JPEG, nil
case ".webp":
return assets.WEBP, nil
case ".avif":
return assets.AVIF, nil
}
return assets.Unknown, fmt.Errorf("%w: for file %q with extension %q", ErrUnknownType, fn, ext)
}
func typeFromSyncSet(fn, media string, inline, sync, async, preload assets.Type) assets.Type {
t := inline
if media != "" {
t = sync
}
prefixes := map[string]assets.Type{
inlinePrefix: inline,
syncPrefix: sync,
asyncPrefix: async,
preloadPrefix: preload,
}
for pr, ty := range prefixes {
if strings.HasSuffix(fn, pr) {
t = ty
break
}
}
return t
}
func filename(path string) (filename string, media string, ext string) {
ext = filepath.Ext(path)
media = ""
filename = strings.TrimSuffix(filepath.Base(path), ext)
pieces := strings.Split(filename, ".")
if len(pieces) == 1 || ext != ".css" || !isMedia(pieces[len(pieces)-1]) {
return filename, media, ext
}
media = pieces[len(pieces)-1]
pieces = pieces[:len(pieces)-1]
return strings.Join(pieces, "."), media, ext
}
func isMedia(s string) bool {
for _, m := range mediaValues {
if strings.Contains(strings.ToLower(s), m) {
return true
}
}
return false
}