package plugins import ( zipa "archive/zip" "context" "crypto/sha256" "encoding/json" "errors" "fmt" "io" "net/http" "net/url" "os" "path" "path/filepath" "strings" "time" "golang.org/x/mod/module" "golang.org/x/mod/zip" "gopkg.in/yaml.v3" ) const ( sourcesFolder = "sources" archivesFolder = "archives" stateFilename = "state.json" goPathSrc = "src" pluginManifest = ".traefik.yml" ) const pluginsURL = "https://plugins.traefik.io/public/" const ( hashHeader = "X-Plugin-Hash" tokenHeader = "X-Token" ) // ClientOptions the options of a Traefik plugins client. type ClientOptions struct { Output string } // Client a Traefik plugins client. type Client struct { HTTPClient *http.Client baseURL *url.URL token string archives string stateFile string goPath string sources string } // NewClient creates a new Traefik plugins client. func NewClient(opts ClientOptions) (*Client, error) { baseURL, err := url.Parse(pluginsURL) if err != nil { return nil, err } sourcesRootPath := filepath.Join(filepath.FromSlash(opts.Output), sourcesFolder) err = resetDirectory(sourcesRootPath) if err != nil { return nil, err } goPath, err := os.MkdirTemp(sourcesRootPath, "gop-*") if err != nil { return nil, fmt.Errorf("failed to create GoPath: %w", err) } archivesPath := filepath.Join(filepath.FromSlash(opts.Output), archivesFolder) err = os.MkdirAll(archivesPath, 0o755) if err != nil { return nil, fmt.Errorf("failed to create archives directory %s: %w", archivesPath, err) } return &Client{ HTTPClient: &http.Client{Timeout: 10 * time.Second}, baseURL: baseURL, archives: archivesPath, stateFile: filepath.Join(archivesPath, stateFilename), goPath: goPath, sources: filepath.Join(goPath, goPathSrc), }, nil } // GoPath gets the plugins GoPath. func (c *Client) GoPath() string { return c.goPath } // ReadManifest reads a plugin manifest. func (c *Client) ReadManifest(moduleName string) (*Manifest, error) { return ReadManifest(c.goPath, moduleName) } // ReadManifest reads a plugin manifest. func ReadManifest(goPath, moduleName string) (*Manifest, error) { p := filepath.Join(goPath, goPathSrc, filepath.FromSlash(moduleName), pluginManifest) file, err := os.Open(p) if err != nil { return nil, fmt.Errorf("failed to open the plugin manifest %s: %w", p, err) } defer func() { _ = file.Close() }() m := &Manifest{} err = yaml.NewDecoder(file).Decode(m) if err != nil { return nil, fmt.Errorf("failed to decode the plugin manifest %s: %w", p, err) } return m, nil } // Download downloads a plugin archive. func (c *Client) Download(ctx context.Context, pName, pVersion string) (string, error) { filename := c.buildArchivePath(pName, pVersion) var hash string _, err := os.Stat(filename) if err != nil && !os.IsNotExist(err) { return "", fmt.Errorf("failed to read archive %s: %w", filename, err) } if err == nil { hash, err = computeHash(filename) if err != nil { return "", fmt.Errorf("failed to compute hash: %w", err) } } endpoint, err := c.baseURL.Parse(path.Join(c.baseURL.Path, "download", pName, pVersion)) if err != nil { return "", fmt.Errorf("failed to parse endpoint URL: %w", err) } req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil) if err != nil { return "", fmt.Errorf("failed to create request: %w", err) } if hash != "" { req.Header.Set(hashHeader, hash) } if c.token != "" { req.Header.Set(tokenHeader, c.token) } resp, err := c.HTTPClient.Do(req) if err != nil { return "", fmt.Errorf("failed to call service: %w", err) } defer func() { _ = resp.Body.Close() }() switch resp.StatusCode { case http.StatusNotModified: // noop return hash, nil case http.StatusOK: err = os.MkdirAll(filepath.Dir(filename), 0o755) if err != nil { return "", fmt.Errorf("failed to create directory: %w", err) } var file *os.File file, err = os.Create(filename) if err != nil { return "", fmt.Errorf("failed to create file %q: %w", filename, err) } defer func() { _ = file.Close() }() _, err = io.Copy(file, resp.Body) if err != nil { return "", fmt.Errorf("failed to write response: %w", err) } hash, err = computeHash(filename) if err != nil { return "", fmt.Errorf("failed to compute hash: %w", err) } return hash, nil default: data, _ := io.ReadAll(resp.Body) return "", fmt.Errorf("error: %d: %s", resp.StatusCode, string(data)) } } // Check checks the plugin archive integrity. func (c *Client) Check(ctx context.Context, pName, pVersion, hash string) error { endpoint, err := c.baseURL.Parse(path.Join(c.baseURL.Path, "validate", pName, pVersion)) if err != nil { return fmt.Errorf("failed to parse endpoint URL: %w", err) } req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil) if err != nil { return fmt.Errorf("failed to create request: %w", err) } if hash != "" { req.Header.Set(hashHeader, hash) } if c.token != "" { req.Header.Set(tokenHeader, c.token) } resp, err := c.HTTPClient.Do(req) if err != nil { return fmt.Errorf("failed to call service: %w", err) } defer func() { _ = resp.Body.Close() }() if resp.StatusCode == http.StatusOK { return nil } return fmt.Errorf("plugin integrity check failed") } // Unzip unzip a plugin archive. func (c *Client) Unzip(pName, pVersion string) error { err := c.unzipModule(pName, pVersion) if err == nil { return nil } return c.unzipArchive(pName, pVersion) } func (c *Client) unzipModule(pName, pVersion string) error { src := c.buildArchivePath(pName, pVersion) dest := filepath.Join(c.sources, filepath.FromSlash(pName)) return zip.Unzip(dest, module.Version{Path: pName, Version: pVersion}, src) } func (c *Client) unzipArchive(pName, pVersion string) error { zipPath := c.buildArchivePath(pName, pVersion) archive, err := zipa.OpenReader(zipPath) if err != nil { return err } defer func() { _ = archive.Close() }() dest := filepath.Join(c.sources, filepath.FromSlash(pName)) for _, f := range archive.File { err = unzipFile(f, dest) if err != nil { return fmt.Errorf("unable to unzip %s: %w", f.Name, err) } } return nil } func unzipFile(f *zipa.File, dest string) error { rc, err := f.Open() if err != nil { return err } defer func() { _ = rc.Close() }() pathParts := strings.SplitN(f.Name, "/", 2) p := filepath.Join(dest, pathParts[1]) if f.FileInfo().IsDir() { err = os.MkdirAll(p, f.Mode()) if err != nil { return fmt.Errorf("unable to create archive directory %s: %w", p, err) } return nil } err = os.MkdirAll(filepath.Dir(p), 0o750) if err != nil { return fmt.Errorf("unable to create archive directory %s for file %s: %w", filepath.Dir(p), p, err) } elt, err := os.OpenFile(p, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode()) if err != nil { return err } defer func() { _ = elt.Close() }() _, err = io.Copy(elt, rc) if err != nil { return err } return nil } // CleanArchives cleans plugins archives. func (c *Client) CleanArchives(plugins map[string]Descriptor) error { if _, err := os.Stat(c.stateFile); os.IsNotExist(err) { return nil } stateFile, err := os.Open(c.stateFile) if err != nil { return fmt.Errorf("failed to open state file %s: %w", c.stateFile, err) } previous := make(map[string]string) err = json.NewDecoder(stateFile).Decode(&previous) if err != nil { return fmt.Errorf("failed to decode state file %s: %w", c.stateFile, err) } for pName, pVersion := range previous { for _, desc := range plugins { if desc.ModuleName == pName && desc.Version != pVersion { archivePath := c.buildArchivePath(pName, pVersion) if err = os.RemoveAll(archivePath); err != nil { return fmt.Errorf("failed to remove archive %s: %w", archivePath, err) } } } } return nil } // WriteState writes the plugins state files. func (c *Client) WriteState(plugins map[string]Descriptor) error { m := make(map[string]string) for _, descriptor := range plugins { m[descriptor.ModuleName] = descriptor.Version } mp, err := json.MarshalIndent(m, "", " ") if err != nil { return fmt.Errorf("unable to marshal plugin state: %w", err) } return os.WriteFile(c.stateFile, mp, 0o600) } // ResetAll resets all plugins related directories. func (c *Client) ResetAll() error { if c.goPath == "" { return errors.New("goPath is empty") } err := resetDirectory(filepath.Join(c.goPath, "..")) if err != nil { return fmt.Errorf("unable to reset plugins GoPath directory %s: %w", c.goPath, err) } err = resetDirectory(c.archives) if err != nil { return fmt.Errorf("unable to reset plugins archives directory: %w", err) } return nil } func (c *Client) buildArchivePath(pName, pVersion string) string { return filepath.Join(c.archives, filepath.FromSlash(pName), pVersion+".zip") } func resetDirectory(dir string) error { dirPath, err := filepath.Abs(dir) if err != nil { return fmt.Errorf("unable to get absolute path of %s: %w", dir, err) } currentPath, err := os.Getwd() if err != nil { return fmt.Errorf("unable to get the current directory: %w", err) } if strings.HasPrefix(currentPath, dirPath) { return fmt.Errorf("cannot be deleted: the directory path %s is the parent of the current path %s", dirPath, currentPath) } err = os.RemoveAll(dir) if err != nil { return fmt.Errorf("unable to remove directory %s: %w", dirPath, err) } err = os.MkdirAll(dir, 0o755) if err != nil { return fmt.Errorf("unable to create directory %s: %w", dirPath, err) } return nil } func computeHash(filepath string) (string, error) { file, err := os.Open(filepath) if err != nil { return "", err } hash := sha256.New() if _, err := io.Copy(hash, file); err != nil { return "", err } sum := hash.Sum(nil) return fmt.Sprintf("%x", sum), nil }