36 lines
829 B
Go
36 lines
829 B
Go
package main
|
|
|
|
import (
|
|
"net/http"
|
|
"os"
|
|
"path"
|
|
)
|
|
|
|
// fallback opens defaultPath when the underlying fs returns os.ErrNotExist
|
|
type fallback struct {
|
|
defaultPath string
|
|
fs http.FileSystem
|
|
}
|
|
|
|
func OpenDefault(fb fallback, requestPath string) (http.File, error) {
|
|
requestPath = path.Dir(requestPath)
|
|
defaultFile := requestPath + "/" + fb.defaultPath
|
|
|
|
f, err := fb.fs.Open(defaultFile)
|
|
if os.IsNotExist(err) && requestPath != "" {
|
|
parentPath, _ := path.Split(requestPath)
|
|
return OpenDefault(fb, parentPath)
|
|
}
|
|
return f, err
|
|
}
|
|
|
|
func (fb fallback) Open(requestPath string) (http.File, error) {
|
|
f, err := fb.fs.Open(requestPath)
|
|
if os.IsNotExist(err) {
|
|
if len(fb.defaultPath) == 0 || fb.defaultPath[0] == '/' {
|
|
return fb.fs.Open(fb.defaultPath)
|
|
}
|
|
return OpenDefault(fb, requestPath)
|
|
}
|
|
return f, err
|
|
}
|