embed.go

package assets

import (
	"embed"
	"fmt"
	"mime"
	"path/filepath"

	"github.com/pkg/errors"

	"projectforge.dev/projectforge/app/util"
)

//go:embed *
var FS embed.FS

type Entry struct {
	Bytes []byte
	Mime  string
	Hash  string
}

var cache = map[string]*Entry{}

func Embed(path string) (*Entry, error) {
	if path == "embed.go" {
		return nil, errors.New("invalid asset")
	}
	if x, ok := cache[path]; ok {
		return x, nil
	}
	data, err := FS.ReadFile(path)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading asset at [%s]", path)
	}
	mt := mime.TypeByExtension(filepath.Ext(path))
	h := util.HashFNV128UUID(string(data))
	e := &Entry{Bytes: data, Mime: mt, Hash: h.String()[:8]}
	cache[path] = e
	return e, nil
}

func URL(path string) string {
	e, _ := Embed(path)
	return fmt.Sprintf("/assets/%s?hash=%s", path, e.Hash)
}