Add req.Params to replace utils.Param*

server/subsonic/helpers.go

@@ -2,6 +2,7 @@ package subsonic
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"mime"
 	"net/http"
@@ -62,6 +63,13 @@ func newError(code int, message ...interface{}) error {
 	}
 }
 
+// errSubsonic and Unwrap are used to allow `errors.Is(err, errSubsonic)` to work
+var errSubsonic = errors.New("subsonic API error")
+
+func (e subError) Unwrap() error {
+	return fmt.Errorf("%w: %d", errSubsonic, e.code)
+}
+
 func (e subError) Error() string {
 	var msg string
 	if len(e.messages) == 0 {