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package server
import (
"fmt"
"hash/fnv"
"io"
"io/fs"
"log"
"log/slog"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
)
type File struct {
filename string
etag string
}
var files = map[string]File{}
func hashFile(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", err
}
defer f.Close()
hash := fnv.New64a()
if _, err := io.Copy(hash, f); err != nil {
return "", err
}
return fmt.Sprintf(`W/"%x"`, hash.Sum(nil)), nil
}
func registerFile(urlpath string, filepath string) error {
if files[urlpath] != (File{}) {
log.Printf("registerFile called with duplicate file, urlPath: %s", urlpath)
return nil
}
hash, err := hashFile(filepath)
if err != nil {
return err
}
files[urlpath] = File{
filename: filepath,
etag: hash,
}
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() {
slog.Debug("registering file", "urlpath", "/"+urlPath)
return registerFile("/"+urlPath, filePath)
}
return nil
})
if err != nil {
return err
}
return nil
}
func GetFile(urlPath string) File {
return files[urlPath]
}
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