package main import ( "errors" "fmt" "io/ioutil" "net/http" "os" "path/filepath" "strings" "github.com/spf13/cobra" yaml "gopkg.in/yaml.v2" "src.lwithers.me.uk/go/htpack/cmd/htpacker/packer" ) var yamlCmd = &cobra.Command{ Use: "yaml", Short: "Build YAML spec from list of files/dirs", Long: `Generates a YAML specification from a list of files and directories. The specification is suitable for passing to pack. File names will be mapped as follows: • if you specify a file, it will appear be served as "/filename"; • if you specify a directory, its contents will be merged into "/", such that a directory with contents "a", "b", and "c/d" will cause entries "/a", "/b" and "/c/d" to be served. `, RunE: func(c *cobra.Command, args []string) error { if len(args) == 0 { return errors.New("must specify one or more files/directories") } // convert "out" to absolute path, in case we need to chdir out, err := c.Flags().GetString("out") if err != nil { return err } out, err = filepath.Abs(out) if err != nil { return err } // chdir if required chdir, err := c.Flags().GetString("chdir") if err != nil { return err } if chdir != "" { if err = os.Chdir(chdir); err != nil { return err } } if err := MakeYaml(args, out); err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) } return nil }, } func init() { yamlCmd.Flags().StringP("out", "O", "", "Output filename") yamlCmd.MarkFlagRequired("out") yamlCmd.Flags().StringP("chdir", "C", "", "Change to directory before searching for input files") } func MakeYaml(args []string, out string) error { ftp, err := filesFromList(args) if err != nil { return err } raw, err := yaml.Marshal(ftp) if err != nil { return fmt.Errorf("failed to marshal %T to YAML: %v", ftp, err) } return ioutil.WriteFile(out, raw, 0666) } func filesFromList(args []string) (packer.FilesToPack, error) { ftp := make(packer.FilesToPack) // NB: we don't use filepath.Walk since: // (a) we don't care about lexical order; just do it quick // (b) we want to dereference symlinks for _, arg := range args { if err := filesFromListR(arg, arg, ftp); err != nil { return nil, err } } return ftp, nil } func filesFromListR(prefix, arg string, ftp packer.FilesToPack) error { f, err := os.Open(arg) if err != nil { return err } defer f.Close() fi, err := f.Stat() if err != nil { return err } switch { case fi.Mode().IsDir(): // readdir fnames, err := f.Readdirnames(0) // 0 ⇒ everything if err != nil { return err } for _, fname := range fnames { fullname := filepath.Join(arg, fname) if err = filesFromListR(prefix, fullname, ftp); err != nil { return err } } return nil case fi.Mode().IsRegular(): // sniff content type buf := make([]byte, 512) n, err := f.Read(buf) if err != nil { return fmt.Errorf("failed to read %s: %v", arg, err) } buf = buf[:n] ctype := http.DetectContentType(buf) // augmented rules for JS / CSS / etc. switch { case strings.HasPrefix(ctype, "text/plain"): switch filepath.Ext(arg) { case ".css": ctype = "text/css" case ".js": ctype = "application/javascript" case ".json": ctype = "application/json" case ".svg": ctype = "image/svg+xml" } case strings.HasPrefix(ctype, "text/xml"): switch filepath.Ext(arg) { case ".svg": ctype = "image/svg+xml" } } // pack srvName := strings.TrimPrefix(arg, prefix) if srvName == "" { srvName = filepath.Base(arg) } if !strings.HasPrefix(srvName, "/") { srvName = "/" + srvName } ftp[srvName] = packer.FileToPack{ Filename: arg, ContentType: ctype, } return nil default: return fmt.Errorf("%s: not file/dir (mode %x)", arg, fi.Mode()) } }