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package frontend
import (
"crypto/sha256"
"encoding/base64"
"io"
"io/fs"
"net/url"
"github.com/pkg/errors"
)
var Assets = AssetCollection{
Scripts: make(map[string]Asset),
Stylesheets: make(map[string]Asset),
}
type Asset struct {
URL string
Base64SHA256 string
}
type AssetCollection struct {
Scripts map[string]Asset
Stylesheets map[string]Asset
}
func hashFile(filename string) ([]byte, error) {
file, err := Files.Open(filename)
if err != nil {
return nil, errors.WithMessagef(err, "could not open file %s", filename)
}
sum := sha256.New()
defer file.Close()
if _, err := io.Copy(sum, file); err != nil {
return nil, errors.WithMessagef(err, "could not hash file %s", filename)
}
return sum.Sum(nil), nil
}
func newAsset(filename string, hash []byte) Asset {
u, err := url.JoinPath("/", filename)
if err != nil {
panic(err)
}
return Asset{
URL: u,
Base64SHA256: base64.StdEncoding.EncodeToString(hash),
}
}
func hashScripts() error {
scripts, err := fs.Glob(Files, "static/**.js")
if err != nil {
return errors.WithMessage(err, "could not glob files")
}
for _, filename := range scripts {
hash, err := hashFile(filename)
if err != nil {
return err
}
Assets.Scripts[filename] = newAsset(filename, hash)
}
return nil
}
func hashStyles() error {
styles, err := fs.Glob(Files, "static/**.css")
if err != nil {
return errors.WithMessage(err, "could not glob files")
}
for _, filename := range styles {
hash, err := hashFile(filename)
if err != nil {
return err
}
Assets.Stylesheets[filename] = newAsset(filename, hash)
}
return nil
}
func init() {
err := hashScripts()
if err != nil {
panic(err)
}
err = hashStyles()
if err != nil {
panic(err)
}
}
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