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package website
import (
"fmt"
"hash/fnv"
"io"
"io/fs"
"mime"
"os"
"path/filepath"
"strings"
"website/internal/log"
"github.com/pkg/errors"
)
type File struct {
contentType string
etag string
alternatives map[string]string
}
func (f *File) AvailableEncodings() []string {
encs := []string{}
for enc := range f.alternatives {
encs = append(encs, enc)
}
return encs
}
var files = map[string]*File{}
func hashFile(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", errors.Wrapf(err, "could not open file %s for hashing", filename)
}
defer f.Close()
hash := fnv.New64a()
if _, err := io.Copy(hash, f); err != nil {
return "", errors.Wrapf(err, "could not hash file %s", filename)
}
return fmt.Sprintf(`W/"%x"`, hash.Sum(nil)), nil
}
var encodings = map[string]string{
"br": ".br",
"gzip": ".gz",
}
func registerFile(urlpath string, fp string) error {
hash, err := hashFile(fp)
if err != nil {
return err
}
f := File{
contentType: mime.TypeByExtension(filepath.Ext(fp)),
etag: hash,
alternatives: map[string]string{
"identity": fp,
},
}
for enc, suffix := range encodings {
_, err := os.Stat(fp + suffix)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
continue
}
return err
}
f.alternatives[enc] = fp + suffix
}
files[urlpath] = &f
return nil
}
func registerContentFiles(root string) error {
err := filepath.WalkDir(root, func(filePath string, f fs.DirEntry, err error) error {
if err != nil {
return errors.WithMessagef(err, "failed to access path %s", filePath)
}
relPath, err := filepath.Rel(root, filePath)
if err != nil {
return errors.WithMessagef(err, "failed to make path relative, path: %s", filePath)
}
urlPath, _ := strings.CutSuffix("/"+relPath, "index.html")
if !f.IsDir() {
switch filepath.Ext(relPath) {
case ".br", ".gz":
return nil
}
log.Debug("registering file", "urlpath", urlPath)
return registerFile(urlPath, filePath)
}
return nil
})
if err != nil {
return errors.Wrap(err, "could not walk directory")
}
return nil
}
func GetFile(urlPath string) *File {
return files[urlPath]
}
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