| // Copyright 2024 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| //go:build go1.23 |
| |
| // Copied from golang.org/x/telemetry/internal/proxy |
| package main |
| |
| import ( |
| "archive/zip" |
| "fmt" |
| "io" |
| "os" |
| "path/filepath" |
| "strings" |
| |
| "golang.org/x/mod/module" |
| ) |
| |
| // WriteProxy creates a new proxy file tree using the provided content, |
| // and returns its URL. |
| func WriteProxy(tmpdir string, files map[string][]byte) (string, error) { |
| type moduleVersion struct { |
| modulePath, version string |
| } |
| // Transform into the format expected by the proxydir package. |
| filesByModule := make(map[moduleVersion]map[string][]byte) |
| for name, data := range files { |
| modulePath, version, suffix := splitModuleVersionPath(name) |
| mv := moduleVersion{modulePath, version} |
| if _, ok := filesByModule[mv]; !ok { |
| filesByModule[mv] = make(map[string][]byte) |
| } |
| filesByModule[mv][suffix] = data |
| } |
| for mv, files := range filesByModule { |
| if err := writeModuleVersion(tmpdir, mv.modulePath, mv.version, files); err != nil { |
| return "", fmt.Errorf("error writing %s@%s: %v", mv.modulePath, mv.version, err) |
| } |
| } |
| return toURL(tmpdir), nil |
| } |
| |
| // splitModuleVersionPath extracts module information from files stored in the |
| // directory structure modulePath@version/suffix. |
| // For example: |
| // |
| // splitModuleVersionPath("mod.com@v1.2.3/package") = ("mod.com", "v1.2.3", "package") |
| func splitModuleVersionPath(path string) (modulePath, version, suffix string) { |
| parts := strings.Split(path, "/") |
| var modulePathParts []string |
| for i, p := range parts { |
| if strings.Contains(p, "@") { |
| mv := strings.SplitN(p, "@", 2) |
| modulePathParts = append(modulePathParts, mv[0]) |
| return strings.Join(modulePathParts, "/"), mv[1], strings.Join(parts[i+1:], "/") |
| } |
| modulePathParts = append(modulePathParts, p) |
| } |
| // Default behavior: this is just a module path. |
| return path, "", "" |
| } |
| |
| // writeModuleVersion creates a directory in the proxy dir for a module. |
| func writeModuleVersion(rootDir, mod, ver string, files map[string][]byte) (rerr error) { |
| dir := filepath.Join(rootDir, mod, "@v") |
| if err := os.MkdirAll(dir, 0755); err != nil { |
| return err |
| } |
| // The go command checks for versions by looking at the "list" file. Since |
| // we are supporting multiple versions, create this file if it does not exist |
| // or append the version number to the preexisting file. |
| f, err := os.OpenFile(filepath.Join(dir, "list"), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) |
| if err != nil { |
| return err |
| } |
| defer checkClose("list file", f, &rerr) |
| if _, err := f.WriteString(ver + "\n"); err != nil { |
| return err |
| } |
| // Serve the go.mod file on the <version>.mod url, if it exists. Otherwise, |
| // serve a stub. |
| modContents, ok := files["go.mod"] |
| if !ok { |
| modContents = []byte("module " + mod) |
| } |
| if err := os.WriteFile(filepath.Join(dir, ver+".mod"), modContents, 0644); err != nil { |
| return err |
| } |
| // info file, just the bare bones. |
| infoContents := []byte(fmt.Sprintf(`{"Version": "%v", "Time":"2017-12-14T13:08:43Z"}`, ver)) |
| if err := os.WriteFile(filepath.Join(dir, ver+".info"), infoContents, 0644); err != nil { |
| return err |
| } |
| // zip of all the source files. |
| f, err = os.OpenFile(filepath.Join(dir, ver+".zip"), os.O_CREATE|os.O_WRONLY, 0644) |
| if err != nil { |
| return err |
| } |
| defer checkClose("zip file", f, &rerr) |
| z := zip.NewWriter(f) |
| defer checkClose("zip writer", z, &rerr) |
| for name, contents := range files { |
| zf, err := z.Create(mod + "@" + ver + "/" + name) |
| if err != nil { |
| return err |
| } |
| if _, err := zf.Write(contents); err != nil { |
| return err |
| } |
| } |
| // Populate the /module/path/@latest that is used by @latest query. |
| if module.IsPseudoVersion(ver) { |
| latestFile := filepath.Join(rootDir, mod, "@latest") |
| if err := os.WriteFile(latestFile, infoContents, 0644); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| func checkClose(name string, closer io.Closer, err *error) { |
| if cerr := closer.Close(); cerr != nil && *err == nil { |
| *err = fmt.Errorf("closing %s: %v", name, cerr) |
| } |
| } |
| |
| // toURL returns the file uri for a proxy directory. |
| func toURL(dir string) string { |
| // file URLs on Windows must start with file:///. See golang.org/issue/6027. |
| path := filepath.ToSlash(dir) |
| if !strings.HasPrefix(path, "/") { |
| path = "/" + path |
| } |
| return "file://" + path |
| } |