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package files
import (
"fmt"
"hash/fnv"
"io"
"mime"
"os"
"path/filepath"
"strings"
"gitlab.com/tozd/go/errors"
"go.alanpearce.eu/website/internal/buffer"
"go.alanpearce.eu/website/internal/storage"
)
type Content io.ReadSeekCloser
var encodings = map[string]string{
"br": ".br",
"gzip": ".gz",
}
func (r *Reader) OpenFile(path string, filename string) (*storage.File, error) {
f, err := os.Open(filename)
if err != nil {
return nil, errors.WithMessage(err, "could not open file for reading")
}
stat, err := f.Stat()
if err != nil {
return nil, errors.WithMessage(err, "could not stat file")
}
etag, err := etag(f)
if err != nil {
return nil, errors.WithMessage(err, "could not calculate etag")
}
buf := new(buffer.Buffer)
if _, err := f.WriteTo(buf); err != nil {
return nil, errors.WithMessage(err, "could not read file")
}
file := &storage.File{
Path: path,
ContentType: mime.TypeByExtension(filepath.Ext(filename)),
LastModified: stat.ModTime(),
Etag: etag,
Encodings: map[string]*buffer.Buffer{
"identity": buf,
},
}
for enc, suffix := range encodings {
_, err := os.Stat(filename + suffix)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
continue
}
return nil, errors.WithMessagef(err, "could not stat file %s", filename+suffix)
}
bytes, err := os.ReadFile(filename + suffix)
if err != nil {
return nil, errors.WithMessagef(err, "could not read file %s", filename+suffix)
}
buf := buffer.NewBuffer(bytes)
file.Encodings[enc] = buf
}
return file, nil
}
func etag(f io.Reader) (string, error) {
hash := fnv.New64a()
if _, err := io.Copy(hash, f); err != nil {
return "", errors.WithMessage(err, "could not hash file")
}
return fmt.Sprintf(`W/"%x"`, hash.Sum(nil)), nil
}
func pathNameToFileName(pathname string) string {
if strings.HasSuffix(pathname, "/") {
pathname = pathname + "index.html"
}
return strings.TrimPrefix(pathname, "/")
}
func fileNameToPathName(filename string) string {
pathname, _ := strings.CutSuffix(filename, "index.html")
return pathname
}
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