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Find file Copy path
Find file Copy path
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package packr
import (
"bytes"
"compress/gzip"
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"runtime"
"strings"
"github.com/gobuffalo/packd"
)
var (
// ErrResOutsideBox gets returned in case of the requested resources being outside the box
ErrResOutsideBox = fmt.Errorf("Can't find a resource outside the box")
)
var _ packd.Box = Box{}
var _ packd.HTTPBox = Box{}
var _ packd.Lister = Box{}
var _ packd.Addable = Box{}
var _ packd.Walkable = Box{}
var _ packd.Finder = Box{}
var _ packd.LegacyBox = Box{}
// NewBox returns a Box that can be used to
// retrieve files from either disk or the embedded
// binary.
func NewBox(path string) Box {
var cd string
if !filepath.IsAbs(path) {
_, filename, _, _ := runtime.Caller(1)
cd = filepath.Dir(filename)
}
// this little hack courtesy of the `-cover` flag!!
cov := filepath.Join("_test", "_obj_test")
cd = strings.Replace(cd, string(filepath.Separator)+cov, "", 1)
if !filepath.IsAbs(cd) && cd != "" {
cd = filepath.Join(GoPath(), "src", cd)
}
return Box{
Path: path,
callingDir: cd,
data: map[string][]byte{},
}
}
// Box represent a folder on a disk you want to
// have access to in the built Go binary.
type Box struct {
Path string
callingDir string
data map[string][]byte
directories map[string]bool
}
// AddString converts t to a byteslice and delegates to AddBytes to add to b.data
func (b Box) AddString(path string, t string) error {
b.AddBytes(path, []byte(t))
return nil
}
// AddBytes sets t in b.data by the given path
func (b Box) AddBytes(path string, t []byte) error {
b.data[path] = t
return nil
}
// Deprecated: Use FindString instead.
func (b Box) String(name string) string {
bb, _ := b.FindString(name)
return bb
}
// Deprecated: Use FindString instead.
func (b Box) MustString(name string) (string, error) {
return b.FindString(name)
}
// Deprecated: Use Find instead.
func (b Box) Bytes(name string) []byte {
bb, _ := b.Find(name)
return bb
}
// Deprecated: Use Find instead.
func (b Box) MustBytes(name string) ([]byte, error) {
return b.Find(name)
}
// FindString returns either the string of the requested
// file or an error if it can not be found.
func (b Box) FindString(name string) (string, error) {
bb, err := b.Find(name)
return string(bb), err
}
// Find returns either the byte slice of the requested
// file or an error if it can not be found.
func (b Box) Find(name string) ([]byte, error) {
f, err := b.find(name)
if err == nil {
bb := &bytes.Buffer{}
bb.ReadFrom(f)
return bb.Bytes(), err
}
return nil, err
}
// Has returns true if the resource exists in the box
func (b Box) Has(name string) bool {
_, err := b.find(name)
if err != nil {
return false
}
return true
}
func (b Box) decompress(bb []byte) []byte {
reader, err := gzip.NewReader(bytes.NewReader(bb))
if err != nil {
return bb
}
defer reader.Close()
data, err := ioutil.ReadAll(reader)
if err != nil {
return bb
}
return data
}
func (b Box) find(name string) (File, error) {
if bb, ok := b.data[name]; ok {
return packd.NewFile(name, bytes.NewReader(bb))
}
if b.directories == nil {
b.indexDirectories()
}
cleanName := filepath.ToSlash(filepath.Clean(name))
// Ensure name is not outside the box
if strings.HasPrefix(cleanName, "../") {
return nil, ErrResOutsideBox
}
// Absolute name is considered as relative to the box root
cleanName = strings.TrimPrefix(cleanName, "/")
if _, ok := data[b.Path]; ok {
if bb, ok := data[b.Path][cleanName]; ok {
bb = b.decompress(bb)
return packd.NewFile(cleanName, bytes.NewReader(bb))
}
if _, ok := b.directories[cleanName]; ok {
return packd.NewDir(cleanName)
}
if filepath.Ext(cleanName) != "" {
// The Handler created by http.FileSystem checks for those errors and
// returns http.StatusNotFound instead of http.StatusInternalServerError.
return nil, os.ErrNotExist
}
return nil, os.ErrNotExist
}
// Not found in the box virtual fs, try to get it from the file system
cleanName = filepath.FromSlash(cleanName)
p := filepath.Join(b.callingDir, b.Path, cleanName)
return fileFor(p, cleanName)
}
// Open returns a File using the http.File interface
func (b Box) Open(name string) (http.File, error) {
return b.find(name)
}
// List shows "What's in the box?"
func (b Box) List() []string {
var keys []string
if b.data == nil || len(b.data) == 0 {
b.Walk(func(path string, info File) error {
finfo, _ := info.FileInfo()
if !finfo.IsDir() {
keys = append(keys, finfo.Name())
}
return nil
})
} else {
for k := range b.data {
keys = append(keys, k)
}
}
return keys
}
func (b *Box) indexDirectories() {
b.directories = map[string]bool{}
if _, ok := data[b.Path]; ok {
for name := range data[b.Path] {
prefix, _ := path.Split(name)
// Even on Windows the suffix appears to be a /
prefix = strings.TrimSuffix(prefix, "/")
b.directories[prefix] = true
}
}
}
func fileFor(p string, name string) (File, error) {
fi, err := os.Stat(p)
if err != nil {
return nil, err
}
if fi.IsDir() {
return packd.NewDir(p)
}
if bb, err := ioutil.ReadFile(p); err == nil {
return packd.NewFile(name, bytes.NewReader(bb))
}
return nil, os.ErrNotExist
}
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