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//go:build go1.16
// +build go1.16
package echo
import (
"errors"
"io"
"io/fs"
"net/http"
"path/filepath"
)
func (c *context) File(file string) error {
return fsFile(c, file, c.echo.Filesystem)
}
// FileFS serves file from given file system.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (c *context) FileFS(file string, filesystem fs.FS) error {
return fsFile(c, file, filesystem)
}
func fsFile(c Context, file string, filesystem fs.FS) error {
f, err := filesystem.Open(file)
if err != nil {
return ErrNotFound
}
defer f.Close()
fi, _ := f.Stat()
if fi.IsDir() {
file = filepath.ToSlash(filepath.Join(file, indexPage)) // ToSlash is necessary for Windows. fs.Open and os.Open are different in that aspect.
f, err = filesystem.Open(file)
if err != nil {
return ErrNotFound
}
defer f.Close()
if fi, err = f.Stat(); err != nil {
return err
}
}
ff, ok := f.(io.ReadSeeker)
if !ok {
return errors.New("file does not implement io.ReadSeeker")
}
http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), ff)
return nil
}
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