/
files.go
101 lines (84 loc) · 2.06 KB
/
files.go
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package pufferpanel
import (
"errors"
"io"
"os"
"path/filepath"
"strings"
)
const MaxRecursivePath = 256
func JoinPath(paths ...string) string {
return filepath.Join(paths...)
}
func EnsureAccess(source string, prefix string) bool {
//first resolve the correct source path so we can compare with the wanted path
expected, err := findFullPath(prefix)
if err != nil && !os.IsNotExist(err) {
return false
}
expected, err = filepath.Abs(expected)
if err != nil && !os.IsNotExist(err) {
return false
}
replacement, err := findFullPath(source)
if err != nil && !os.IsNotExist(err) {
return false
}
replacement, err = filepath.Abs(replacement)
if err != nil {
return false
}
return strings.HasPrefix(replacement, expected)
}
func CopyFile(src, dest string) error {
source, err := os.Open(src)
if err != nil {
return err
}
defer Close(source)
err = os.MkdirAll(filepath.Dir(dest), 0755)
if err != nil {
return err
}
destination, err := os.Create(dest)
if err != nil {
return err
}
defer Close(destination)
_, err = io.Copy(destination, source)
return err
}
func findFullPath(source string) (string, error) {
fullPath, err := filepath.EvalSymlinks(source)
if err == nil {
return fullPath, err
}
//if file doesn't exist, then filepath doesn't resolve properly, so check backwards
if os.IsNotExist(err) {
var updatePath string
dir, filename := filepath.Split(source)
suffix := string(os.PathSeparator) + filename
i := 0
for i < MaxRecursivePath && dir != "" {
dirFullPath, err := filepath.EvalSymlinks(dir)
if err != nil && os.IsNotExist(err) {
//update our mapping to look farther down
suffix = filepath.Base(dir) + string(os.PathSeparator) + suffix
dir = filepath.Dir(dir)
} else if err != nil {
return "", err
} else {
//we found a good path!
updatePath = dirFullPath + string(os.PathSeparator) + suffix
break
}
i++
if i == MaxRecursivePath {
return "", errors.New("path too recursive")
}
}
updatePath, err = filepath.Abs(updatePath)
return updatePath, err
}
return "", err
}