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/
fs.go
153 lines (128 loc) · 2.42 KB
/
fs.go
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package fs
import (
"net/http"
"os"
"path"
"path/filepath"
"strings"
"sync"
"time"
)
type FS struct {
sync.RWMutex
root listing
}
type listing struct {
files map[string]listing
fileListing *FileListing
}
var (
DefaultFS = NewFS()
)
func NewFS() *FS {
return &FS{root: listing{files: make(map[string]listing),
fileListing: NewFileListing("/", 0, os.ModeDir, time.Now(), []byte{})}}
}
func (fs *FS) Add(fl *FileListing) bool {
fs.Lock()
defer fs.Unlock()
if d, ok := fs.mkdirP(fl.dir); ok {
st, err := fl.Stat()
if err != nil {
return false
}
d.files[st.Name()] = listing{fileListing: fl}
fl.fs = fs
return true
} else {
return false
}
}
func (fs *FS) Open(name string) (f http.File, err error) {
fs.RLock()
defer fs.RUnlock()
name = filepath.ToSlash(name)
if path.IsAbs(name) {
name = path.Clean(name)
} else {
name = path.Clean("/" + name)[1:]
}
if l, ok := fs.getListing(name); ok {
return l.fileListing.Open(), nil
} else {
f, err = os.Open(filepath.FromSlash(name))
}
return
}
func (fs *FS) OpenRoot(root, name string) (http.File, error) {
if root == "" {
root = "."
}
if !filepath.IsAbs(root) {
if abs, err := filepath.Abs(root); err == nil {
root = abs
}
}
return fs.Open(strings.Join([]string{root, path.Clean("/" + name)[1:]}, "/"))
}
func (fs *FS) mkdirP(name string) (listing, bool) {
parts := strings.Split(name, "/")
if parts[0] == "" {
parts = parts[1:]
}
l := fs.root
for i, p := range parts {
st, err := l.fileListing.Stat()
if err != nil {
break
}
if st.IsDir() {
if c, ok := l.files[p]; ok {
if st, err := c.fileListing.Stat(); err != nil || !st.IsDir() {
break
}
l = c
} else {
c = listing{
files: make(map[string]listing),
fileListing: NewFileListing(
strings.Join(parts[:i+1], "/"), 0, os.ModeDir, time.Now(), []byte{}),
}
l.files[p] = c
l = c
}
if len(parts)-1 == i {
return l, true
}
} else {
break
}
}
return fs.root, false
}
func (fs *FS) getListing(name string) (listing, bool) {
parts := strings.Split(name, "/")
if parts[0] == "" {
parts = parts[1:]
}
l := fs.root
for i, p := range parts {
st, err := l.fileListing.Stat()
if err != nil {
break
}
if st.IsDir() {
var ok bool
if l, ok = l.files[p]; ok {
if len(parts)-1 == i {
return l, true
}
} else {
break
}
} else {
break
}
}
return fs.root, false
}