feat: url based data loading system

internal/data/decoder.go

@@ -0,0 +1,40 @@
+package data
+
+import (
+	"io"
+	"net/url"
+
+	"github.com/pkg/errors"
+)
+
+const FormatQueryParam = "format"
+
+type DecoderHandler interface {
+	URLMatcher
+	Decode(url *url.URL, reader io.Reader) (interface{}, error)
+}
+
+type Decoder struct {
+	handlers []DecoderHandler
+}
+
+func (d *Decoder) Decode(url *url.URL, reader io.ReadCloser) (interface{}, error) {
+	for _, h := range d.handlers {
+		if !h.Match(url) {
+			continue
+		}
+
+		data, err := h.Decode(url, reader)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		return data, nil
+	}
+
+	return nil, errors.Wrapf(ErrHandlerNotFound, "could not find matching handler for url '%s'", url.String())
+}
+
+func NewDecoder(handlers ...DecoderHandler) *Decoder {
+	return &Decoder{handlers}
+}