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package utils
import (
"errors"
"io"
"net/http"
"os"
pathpkg "path"
"path/filepath"
"sort"
)
// Walk walks the filesystem rooted at root, calling walkFn for each file or
// directory in the filesystem, including root. All errors that arise visiting files
// and directories are filtered by walkFn. The files are walked in lexical
// order.
func Walk(fs http.FileSystem, root string, walkFn filepath.WalkFunc) error {
info, err := stat(fs, root)
if err != nil {
return walkFn(root, nil, err)
}
return walkInternal(fs, root, info, walkFn)
}
// ReadFile returns the raw content of a file
func ReadFile(path string, fs http.FileSystem) ([]byte, error) {
if fs != nil {
file, err := fs.Open(path)
if err != nil {
return nil, err
}
defer file.Close() //nolint: errcheck // No need to check error
return io.ReadAll(file)
}
return os.ReadFile(path) // #nosec G304
}
// readDirNames reads the directory named by dirname and returns
// a sorted list of directory entries.
func readDirNames(fs http.FileSystem, dirname string) ([]string, error) {
fis, err := readDir(fs, dirname)
if err != nil {
return nil, err
}
names := make([]string, len(fis))
for i := range fis {
names[i] = fis[i].Name()
}
sort.Strings(names)
return names, nil
}
// walkInternal recursively descends path, calling walkFn.
func walkInternal(fs http.FileSystem, path string, info os.FileInfo, walkFn filepath.WalkFunc) error {
err := walkFn(path, info, nil)
if err != nil {
if info.IsDir() && errors.Is(err, filepath.SkipDir) {
return nil
}
return err
}
if !info.IsDir() {
return nil
}
names, err := readDirNames(fs, path)
if err != nil {
return walkFn(path, info, err)
}
for _, name := range names {
filename := pathpkg.Join(path, name)
fileInfo, err := stat(fs, filename)
if err != nil {
if err := walkFn(filename, fileInfo, err); err != nil && !errors.Is(err, filepath.SkipDir) {
return err
}
} else {
err = walkInternal(fs, filename, fileInfo, walkFn)
if err != nil {
if !fileInfo.IsDir() || !errors.Is(err, filepath.SkipDir) {
return err
}
}
}
}
return nil
}
// readDir reads the contents of the directory associated with file and
// returns a slice of FileInfo values in directory order.
func readDir(fs http.FileSystem, name string) ([]os.FileInfo, error) {
f, err := fs.Open(name)
if err != nil {
return nil, err
}
defer f.Close() //nolint: errcheck // No need to check error
return f.Readdir(0)
}
// stat returns the FileInfo structure describing file.
func stat(fs http.FileSystem, name string) (os.FileInfo, error) {
f, err := fs.Open(name)
if err != nil {
return nil, err
}
defer f.Close() //nolint: errcheck // No need to check error
return f.Stat()
}
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