package main import ( "flag" "fmt" "go/build" "io" "net/http" "os" "os/exec" "path/filepath" "regexp" "runtime" "strconv" "strings" ) var directory = flag.String("pwd", "", "Working directory of Xray vprotogen.") // envFile returns the name of the Go environment configuration file. // Copy from https://github.com/golang/go/blob/c4f2a9788a7be04daf931ac54382fbe2cb754938/src/cmd/go/internal/cfg/cfg.go#L150-L166 func envFile() (string, error) { if file := os.Getenv("GOENV"); file != "" { if file == "off" { return "", fmt.Errorf("GOENV=off") } return file, nil } dir, err := os.UserConfigDir() if err != nil { return "", err } if dir == "" { return "", fmt.Errorf("missing user-config dir") } return filepath.Join(dir, "go", "env"), nil } // GetRuntimeEnv returns the value of runtime environment variable, // that is set by running following command: `go env -w key=value`. func GetRuntimeEnv(key string) (string, error) { file, err := envFile() if err != nil { return "", err } if file == "" { return "", fmt.Errorf("missing runtime env file") } var data []byte var runtimeEnv string data, readErr := os.ReadFile(file) if readErr != nil { return "", readErr } envStrings := strings.Split(string(data), "\n") for _, envItem := range envStrings { envItem = strings.TrimSuffix(envItem, "\r") envKeyValue := strings.Split(envItem, "=") if strings.EqualFold(strings.TrimSpace(envKeyValue[0]), key) { runtimeEnv = strings.TrimSpace(envKeyValue[1]) } } return runtimeEnv, nil } // GetGOBIN returns GOBIN environment variable as a string. It will NOT be empty. func GetGOBIN() string { // The one set by user explicitly by `export GOBIN=/path` or `env GOBIN=/path command` GOBIN := os.Getenv("GOBIN") if GOBIN == "" { var err error // The one set by user by running `go env -w GOBIN=/path` GOBIN, err = GetRuntimeEnv("GOBIN") if err != nil { // The default one that Golang uses return filepath.Join(build.Default.GOPATH, "bin") } if GOBIN == "" { return filepath.Join(build.Default.GOPATH, "bin") } return GOBIN } return GOBIN } func whichProtoc(suffix, targetedVersion string) (string, error) { protoc := "protoc" + suffix path, err := exec.LookPath(protoc) if err != nil { errStr := fmt.Sprintf(` Command "%s" not found. Make sure that %s is in your system path or current path. Download %s v%s or later from https://github.com/protocolbuffers/protobuf/releases `, protoc, protoc, protoc, targetedVersion) return "", fmt.Errorf(errStr) } return path, nil } func getProjectProtocVersion(url string) (string, error) { resp, err := http.Get(url) if err != nil { return "", fmt.Errorf("can not get the version of protobuf used in xray project") } defer resp.Body.Close() body, err := io.ReadAll(resp.Body) if err != nil { return "", fmt.Errorf("can not read from body") } versionRegexp := regexp.MustCompile(`\/\/\s*protoc\s*v(\d+\.\d+\.\d+)`) matched := versionRegexp.FindStringSubmatch(string(body)) return matched[1], nil } func getInstalledProtocVersion(protocPath string) (string, error) { cmd := exec.Command(protocPath, "--version") cmd.Env = append(cmd.Env, os.Environ()...) output, cmdErr := cmd.CombinedOutput() if cmdErr != nil { return "", cmdErr } versionRegexp := regexp.MustCompile(`protoc\s*(\d+\.\d+\.\d+)`) matched := versionRegexp.FindStringSubmatch(string(output)) return matched[1], nil } func parseVersion(s string, width int) int64 { strList := strings.Split(s, ".") format := fmt.Sprintf("%%s%%0%ds", width) v := "" for _, value := range strList { v = fmt.Sprintf(format, v, value) } var result int64 var err error if result, err = strconv.ParseInt(v, 10, 64); err != nil { return 0 } return result } func needToUpdate(targetedVersion, installedVersion string) bool { vt := parseVersion(targetedVersion, 4) vi := parseVersion(installedVersion, 4) return vt > vi } func main() { flag.Usage = func() { fmt.Fprintf(flag.CommandLine.Output(), "Usage of vprotogen:\n") flag.PrintDefaults() } flag.Parse() if !filepath.IsAbs(*directory) { pwd, wdErr := os.Getwd() if wdErr != nil { fmt.Println("Can not get current working directory.") os.Exit(1) } *directory = filepath.Join(pwd, *directory) } pwd := *directory GOBIN := GetGOBIN() binPath := os.Getenv("PATH") pathSlice := []string{pwd, GOBIN, binPath} binPath = strings.Join(pathSlice, string(os.PathListSeparator)) os.Setenv("PATH", binPath) suffix := "" if runtime.GOOS == "windows" { suffix = ".exe" } targetedVersion, err := getProjectProtocVersion("https://raw.githubusercontent.com/xtls/xray-core/HEAD/core/config.pb.go") if err != nil { fmt.Println(err) os.Exit(1) } protoc, err := whichProtoc(suffix, targetedVersion) if err != nil { fmt.Println(err) os.Exit(1) } installedVersion, err := getInstalledProtocVersion(protoc) if err != nil { fmt.Println(err) os.Exit(1) } if needToUpdate(targetedVersion, installedVersion) { fmt.Printf(` You are using an old protobuf version, please update to v%s or later. Download it from https://github.com/protocolbuffers/protobuf/releases * Protobuf version used in xray project: v%s * Protobuf version you have installed: v%s `, targetedVersion, targetedVersion, installedVersion) os.Exit(1) } protoFilesMap := make(map[string][]string) walkErr := filepath.Walk(pwd, func(path string, info os.FileInfo, err error) error { if err != nil { fmt.Println(err) return err } if info.IsDir() { return nil } dir := filepath.Dir(path) filename := filepath.Base(path) if strings.HasSuffix(filename, ".proto") { path = path[len(pwd)+1:] protoFilesMap[dir] = append(protoFilesMap[dir], path) } return nil }) if walkErr != nil { fmt.Println(walkErr) os.Exit(1) } for _, files := range protoFilesMap { for _, relProtoFile := range files { args := []string{ "--go_out", pwd, "--go_opt", "paths=source_relative", "--go-grpc_out", pwd, "--go-grpc_opt", "paths=source_relative", "--plugin", "protoc-gen-go=" + filepath.Join(GOBIN, "protoc-gen-go"+suffix), "--plugin", "protoc-gen-go-grpc=" + filepath.Join(GOBIN, "protoc-gen-go-grpc"+suffix), } args = append(args, relProtoFile) cmd := exec.Command(protoc, args...) cmd.Env = append(cmd.Env, os.Environ()...) cmd.Dir = pwd output, cmdErr := cmd.CombinedOutput() if len(output) > 0 { fmt.Println(string(output)) } if cmdErr != nil { fmt.Println(cmdErr) os.Exit(1) } } } }