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em4ht.go
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/
em4ht.go
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package em4ht
import (
"embed"
"io/fs"
"log"
"net/http"
"os"
"strings"
"time"
)
type FS struct {
sfs fs.FS
gMtime time.Time
}
type file struct {
ef fs.File
fs *FS
}
type fileInfo struct {
fi fs.FileInfo
fs *FS
}
func (f fileInfo) Name() string {
return f.fi.Name()
}
func (f fileInfo) Size() int64 {
return f.fi.Size()
}
func (f fileInfo) Mode() fs.FileMode {
return f.fi.Mode()
}
func (f fileInfo) ModTime() time.Time {
return f.fs.gMtime
}
func (f fileInfo) IsDir() bool {
return f.fi.IsDir()
}
func (f fileInfo) Sys() interface{} {
return f.fi.Sys()
}
func (fs FS) Open(name string) (fs.File, error) {
ef, err := fs.sfs.Open(name)
if err != nil {
return nil, err
}
f := file{ef, &fs}
return f, nil
}
func (f file) Stat() (fs.FileInfo, error) {
fi, err := f.ef.Stat()
if err != nil {
return nil, err
}
return fileInfo{fi, f.fs}, nil
}
func (f file) Read(bytes []byte) (int, error) {
return f.ef.Read(bytes)
}
func (f file) Close() error {
return f.ef.Close()
}
func NewEm4htFS(efs embed.FS, rootDir string) (*FS, error) {
efn, err := os.Executable()
if err != nil {
return nil, err
}
ef, err := os.Open(efn)
if err != nil {
return nil, err
}
st, err := ef.Stat()
if err != nil {
return nil, err
}
sfs, err := fs.Sub(efs, rootDir)
return &FS{sfs, st.ModTime()}, nil
}
type spaHttpFileSystem struct {
fs http.FileSystem
prefix string
favico string
}
func (sfs spaHttpFileSystem) Open(path string) (http.File, error) {
log.Println("access", path)
if path != "/" && path != sfs.favico && !strings.HasPrefix(path, "/"+sfs.prefix+"/") {
path = "/index.html"
}
f, err := sfs.fs.Open(path)
if err != nil {
log.Printf("Error opening %s %v", path, err)
return nil, err
}
s, err := f.Stat()
if s.IsDir() {
index := "index.html"
if _, err := sfs.fs.Open(index); err != nil {
log.Printf("Error opening %s %v", index, err)
closeErr := f.Close()
if closeErr != nil {
return nil, closeErr
}
return nil, err
}
}
return f, nil
}
func NewSpaFileSystem(efs embed.FS, rootDir string, prefix string, favico string) (http.FileSystem, error) {
e4hfs, err := NewEm4htFS(efs, rootDir)
if err != nil {
return nil, err
}
return spaHttpFileSystem{http.FS(e4hfs), prefix, favico}, nil
}