mirror of https://github.com/jlelse/GoBlog
103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
package main
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import (
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"crypto/sha1"
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"fmt"
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"io/ioutil"
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"mime"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strings"
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)
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const assetsFolder = "templates/assets"
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var assetFileNames map[string]string = map[string]string{}
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var assetFiles map[string]*assetFile = map[string]*assetFile{}
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type assetFile struct {
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contentType string
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body []byte
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}
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func initTemplateAssets() (err error) {
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err = filepath.Walk(assetsFolder, func(path string, info os.FileInfo, err error) error {
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if info.Mode().IsRegular() {
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compiled, err := compileAsset(path)
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if err != nil {
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return err
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}
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if compiled != "" {
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assetFileNames[strings.TrimPrefix(path, assetsFolder+"/")] = compiled
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}
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}
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return nil
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})
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if 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 compileAsset(name string) (compiledFileName string, err error) {
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originalContent, err := ioutil.ReadFile(name)
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if err != nil {
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return
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}
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ext := path.Ext(name)
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var compiledContent []byte
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compiledExt := ext
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switch ext {
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case ".js":
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compiledContent, err = minifier.Bytes("application/javascript", originalContent)
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if err != nil {
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return
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}
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case ".css":
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compiledContent, err = minifier.Bytes("text/css", originalContent)
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if err != nil {
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return
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}
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default:
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// Just copy the file
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compiledContent = originalContent
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}
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sha := sha1.New()
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sha.Write(compiledContent)
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hash := fmt.Sprintf("%x", sha.Sum(nil))
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compiledFileName = hash + compiledExt
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assetFiles[compiledFileName] = &assetFile{
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contentType: mime.TypeByExtension(compiledExt),
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body: compiledContent,
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}
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return
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}
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// Function for templates
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func assetFileName(fileName string) string {
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return "/" + assetFileNames[fileName]
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}
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func allAssetPaths() []string {
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var paths []string
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for _, name := range assetFileNames {
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paths = append(paths, "/"+name)
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}
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return paths
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}
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// Gets only called by registered paths
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func serveAsset(w http.ResponseWriter, r *http.Request) {
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f := strings.TrimPrefix(r.URL.Path, "/")
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af, ok := assetFiles[f]
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if !ok {
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serve404(w, r)
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return
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}
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w.Header().Set("Cache-Control", "public,max-age=31536000,immutable")
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w.Header().Set(contentType, af.contentType)
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w.Write(af.body)
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}
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