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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,173 +1,175 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "embed" | ||
| "errors" | ||
| "github.com/zeebo/xxh3" | ||
| "io/fs" | ||
| "log" | ||
| "net/http" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| "embed" | ||
| "errors" | ||
| "github.com/zeebo/xxh3" | ||
| "io/fs" | ||
| "log" | ||
| "net/http" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| var ( | ||
| //go:embed all:resources | ||
| assetFs embed.FS | ||
| //go:embed all:resources | ||
| assetFs embed.FS | ||
| ) | ||
|
|
||
| func main() { | ||
| err := run() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| err := run() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
|
|
||
| type assetInfo struct { | ||
| data []byte | ||
| dataBr []byte | ||
| eTag string | ||
| contentLength string | ||
| contentLengthBr string | ||
| data []byte | ||
| dataBr []byte | ||
| eTag string | ||
| contentLength string | ||
| contentLengthBr string | ||
|
|
||
| contentType string | ||
| contentType string | ||
| } | ||
|
|
||
| func run() error { | ||
| var pathToAsset = map[string]*assetInfo{} | ||
|
|
||
| err := fs.WalkDir(assetFs, "resources", func(path string, _ fs.DirEntry, err error) error { | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if !strings.ContainsRune(path, '.') || strings.HasPrefix(path, "/.") { | ||
| // is a directory | ||
| return nil | ||
| } | ||
|
|
||
| data, err := assetFs.ReadFile(path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if path == "resources" { | ||
| return nil | ||
| } | ||
|
|
||
| key := strings.TrimPrefix(path, "resources") | ||
| isBr := strings.HasSuffix(key, ".br") | ||
| if isBr { | ||
| key = strings.TrimSuffix(key, ".br") | ||
| } | ||
|
|
||
| info := pathToAsset[key] | ||
| if info == nil { | ||
| info = &assetInfo{} | ||
| pathToAsset[key] = info | ||
| } | ||
|
|
||
| lengthAsString := strconv.Itoa(len(data)) | ||
| if isBr { | ||
| info.dataBr = data | ||
| info.contentLengthBr = lengthAsString | ||
| } else { | ||
| info.data = data | ||
| info.contentLength = lengthAsString | ||
|
|
||
| // no mime type on distroless image | ||
| switch { | ||
| case strings.HasSuffix(key, ".woff"): | ||
| info.contentType = "font/woff" | ||
| case strings.HasSuffix(key, ".woff2"): | ||
| info.contentType = "font/woff2" | ||
| case strings.HasSuffix(key, ".svg"): | ||
| info.contentType = "image/svg+xml" | ||
| case strings.HasSuffix(key, ".js"): | ||
| info.contentType = "text/javascript" | ||
| case strings.HasSuffix(key, ".json"): | ||
| info.contentType = "application/json" | ||
| case strings.HasSuffix(key, ".html"): | ||
| info.contentType = "text/html" | ||
| case strings.HasSuffix(key, ".css"): | ||
| info.contentType = "text/css" | ||
| case strings.HasSuffix(key, ".wasm"): | ||
| info.contentType = "application/wasm" | ||
| case strings.HasSuffix(key, ".dictionary"): | ||
| info.contentType = "application/octet-stream" | ||
| default: | ||
| return errors.New("cannot determinate content-type by file extension: " + filepath.Ext(path)) | ||
| } | ||
|
|
||
| // assets are immutable | ||
| if !strings.HasPrefix(key, "/assets/") { | ||
| hash := xxh3.Hash128(data) | ||
| info.eTag = strconv.FormatUint(hash.Hi, 36) + "-" + strconv.FormatUint(hash.Lo, 36) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // no need to keep it anymore | ||
| assetFs = embed.FS{} | ||
|
|
||
| indexHtml := pathToAsset["/index.html"] | ||
| pathToAsset["/"] = indexHtml | ||
|
|
||
| http.Handle("/index.html", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) { | ||
| newPath := "./" | ||
| q := request.URL.RawQuery | ||
| if q != "" { | ||
| newPath += "?" + q | ||
| } | ||
| writer.Header().Set("Location", newPath) | ||
| writer.WriteHeader(http.StatusMovedPermanently) | ||
| })) | ||
| http.Handle("/", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) { | ||
| header := writer.Header() | ||
|
|
||
| path := request.URL.Path | ||
| asset := pathToAsset[path] | ||
| if asset == nil { | ||
| if strings.ContainsRune(path, '.') { | ||
| http.NotFound(writer, request) | ||
| return | ||
| } | ||
|
|
||
| // vue router HTML5 mode (https://next.router.vuejs.org/guide/essentials/history-mode.html#html5-mode) | ||
| asset = indexHtml | ||
| } | ||
|
|
||
| header.Set("Vary", "Accept-Encoding") | ||
| header.Set("Content-Type", asset.contentType) | ||
|
|
||
| // https://medium.com/adobetech/an-http-caching-strategy-for-static-assets-configuring-the-server-1192452ce06a | ||
| if asset.eTag == "" { | ||
| header.Set("Cache-Control", "public,max-age=31536000,immutable") | ||
| } else { | ||
| header.Set("Cache-Control", "no-cache") | ||
|
|
||
| if request.Header.Get("If-None-Match") == asset.eTag { | ||
| writer.WriteHeader(http.StatusNotModified) | ||
| return | ||
| } | ||
|
|
||
| header.Set("ETag", asset.eTag) | ||
| } | ||
|
|
||
| if len(asset.dataBr) != 0 && strings.Contains(request.Header.Get("Accept-Encoding"), "br") { | ||
| header.Set("Content-Length", asset.contentLengthBr) | ||
| header.Set("Content-Encoding", "br") | ||
| _, _ = writer.Write(asset.dataBr) | ||
| } else { | ||
| header.Set("Content-Length", asset.contentLength) | ||
| _, _ = writer.Write(asset.data) | ||
| } | ||
| })) | ||
| return http.ListenAndServe(":8080", nil) | ||
| var pathToAsset = map[string]*assetInfo{} | ||
|
|
||
| err := fs.WalkDir(assetFs, "resources", func(path string, _ fs.DirEntry, err error) error { | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if !strings.ContainsRune(path, '.') || strings.HasPrefix(path, "/.") { | ||
| // is a directory | ||
| return nil | ||
| } | ||
|
|
||
| data, err := assetFs.ReadFile(path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if path == "resources" { | ||
| return nil | ||
| } | ||
|
|
||
| key := strings.TrimPrefix(path, "resources") | ||
| isBr := strings.HasSuffix(key, ".br") | ||
| if isBr { | ||
| key = strings.TrimSuffix(key, ".br") | ||
| } | ||
|
|
||
| info := pathToAsset[key] | ||
| if info == nil { | ||
| info = &assetInfo{} | ||
| pathToAsset[key] = info | ||
| } | ||
|
|
||
| lengthAsString := strconv.Itoa(len(data)) | ||
| if isBr { | ||
| info.dataBr = data | ||
| info.contentLengthBr = lengthAsString | ||
| } else { | ||
| info.data = data | ||
| info.contentLength = lengthAsString | ||
|
|
||
| // no mime type on distroless image | ||
| switch { | ||
| case strings.HasSuffix(key, ".woff"): | ||
| info.contentType = "font/woff" | ||
| case strings.HasSuffix(key, ".woff2"): | ||
| info.contentType = "font/woff2" | ||
| case strings.HasSuffix(key, ".svg"): | ||
| info.contentType = "image/svg+xml" | ||
| case strings.HasSuffix(key, ".js"): | ||
| info.contentType = "text/javascript" | ||
| case strings.HasSuffix(key, ".json"): | ||
| info.contentType = "application/json" | ||
| case strings.HasSuffix(key, ".html"): | ||
| info.contentType = "text/html" | ||
| case strings.HasSuffix(key, ".css"): | ||
| info.contentType = "text/css" | ||
| case strings.HasSuffix(key, ".wasm"): | ||
| info.contentType = "application/wasm" | ||
| case strings.HasSuffix(key, ".dictionary"): | ||
| info.contentType = "application/octet-stream" | ||
| case strings.HasSuffix(key, ".ttf"): | ||
| info.contentType = "font/ttf" | ||
| default: | ||
| return errors.New("cannot determinate content-type by file extension: " + filepath.Ext(path)) | ||
| } | ||
|
|
||
| // assets are immutable | ||
| if !strings.HasPrefix(key, "/assets/") { | ||
| hash := xxh3.Hash128(data) | ||
| info.eTag = strconv.FormatUint(hash.Hi, 36) + "-" + strconv.FormatUint(hash.Lo, 36) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // no need to keep it anymore | ||
| assetFs = embed.FS{} | ||
|
|
||
| indexHtml := pathToAsset["/index.html"] | ||
| pathToAsset["/"] = indexHtml | ||
|
|
||
| http.Handle("/index.html", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) { | ||
| newPath := "./" | ||
| q := request.URL.RawQuery | ||
| if q != "" { | ||
| newPath += "?" + q | ||
| } | ||
| writer.Header().Set("Location", newPath) | ||
| writer.WriteHeader(http.StatusMovedPermanently) | ||
| })) | ||
| http.Handle("/", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) { | ||
| header := writer.Header() | ||
|
|
||
| path := request.URL.Path | ||
| asset := pathToAsset[path] | ||
| if asset == nil { | ||
| if strings.ContainsRune(path, '.') { | ||
| http.NotFound(writer, request) | ||
| return | ||
| } | ||
|
|
||
| // vue router HTML5 mode (https://next.router.vuejs.org/guide/essentials/history-mode.html#html5-mode) | ||
| asset = indexHtml | ||
| } | ||
|
|
||
| header.Set("Vary", "Accept-Encoding") | ||
| header.Set("Content-Type", asset.contentType) | ||
|
|
||
| // https://medium.com/adobetech/an-http-caching-strategy-for-static-assets-configuring-the-server-1192452ce06a | ||
| if asset.eTag == "" { | ||
| header.Set("Cache-Control", "public,max-age=31536000,immutable") | ||
| } else { | ||
| header.Set("Cache-Control", "no-cache") | ||
|
|
||
| if request.Header.Get("If-None-Match") == asset.eTag { | ||
| writer.WriteHeader(http.StatusNotModified) | ||
| return | ||
| } | ||
|
|
||
| header.Set("ETag", asset.eTag) | ||
| } | ||
|
|
||
| if len(asset.dataBr) != 0 && strings.Contains(request.Header.Get("Accept-Encoding"), "br") { | ||
| header.Set("Content-Length", asset.contentLengthBr) | ||
| header.Set("Content-Encoding", "br") | ||
| _, _ = writer.Write(asset.dataBr) | ||
| } else { | ||
| header.Set("Content-Length", asset.contentLength) | ||
| _, _ = writer.Write(asset.data) | ||
| } | ||
| })) | ||
| return http.ListenAndServe(":8080", nil) | ||
| } |