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fs.go
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fs.go
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package fs
import (
"encoding/base64"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/google/wire"
)
var Set = wire.NewSet(
wire.Struct(new(FileSystem)),
wire.Bind(new(Interface), new(*FileSystem)),
)
//go:generate mockgen -destination mock_fs/mock_fs.go github.com/int128/ghcp/pkg/fs Interface
type Interface interface {
FindFiles(paths []string, filter FindFilesFilter) ([]File, error)
ReadAsBase64EncodedContent(filename string) (string, error)
}
// FindFilesFilter is an interface to filter directories and files.
type FindFilesFilter interface {
SkipDir(path string) bool // If true, it skips entering the directory
ExcludeFile(path string) bool // If true, it excludes the file from the result
}
type nullFindFilesFilter struct{}
func (*nullFindFilesFilter) SkipDir(string) bool { return false }
func (*nullFindFilesFilter) ExcludeFile(string) bool { return false }
type File struct {
Path string
Executable bool
}
// FileSystem provides manipulation of file system.
type FileSystem struct{}
// FindFiles returns a list of files in the paths.
// If the filter is nil, it returns any files.
func (fs *FileSystem) FindFiles(paths []string, filter FindFilesFilter) ([]File, error) {
if filter == nil {
filter = &nullFindFilesFilter{}
}
var files []File
for _, path := range paths {
if err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("error while walk: %w", err)
}
if info.Mode().IsDir() {
if filter.SkipDir(path) {
return filepath.SkipDir
}
return nil
}
if info.Mode().IsRegular() {
if filter.ExcludeFile(path) {
return nil
}
files = append(files, File{
Path: path,
Executable: info.Mode()&0100 != 0, // mask the executable bit of owner
})
return nil
}
return nil
}); err != nil {
return nil, fmt.Errorf("error while finding files in %s: %w", path, err)
}
}
return files, nil
}
// ReadAsBase64EncodedContent returns content of the file as base64 encoded string.
func (fs *FileSystem) ReadAsBase64EncodedContent(filename string) (string, error) {
r, err := os.Open(filename)
if err != nil {
return "", fmt.Errorf("error while opening file %s: %w", filename, err)
}
defer r.Close()
var s strings.Builder
e := base64.NewEncoder(base64.StdEncoding, &s)
if _, err := io.Copy(e, r); err != nil {
return "", fmt.Errorf("error while encoding file %s: %w", filename, err)
}
if err := e.Close(); err != nil {
return "", fmt.Errorf("error while encoding file %s: %w", filename, err)
}
return s.String(), nil
}