feat: reorganize packages

pkg/meta/meta.go

@@ -2,12 +2,16 @@ package meta
 
 import (
 	"errors"
+	"fmt"
+	"reflect"
 
 	"github.com/ipld/go-ipld-prime"
 	"github.com/ipld/go-ipld-prime/datamodel"
 	"github.com/ipld/go-ipld-prime/node/basicnode"
 )
 
+var ErrUnsupported = errors.New("failure adding unsupported type to meta")
+
 var ErrNotFound = errors.New("key-value not found in meta")
 
 // Meta is a container for meta key-value pairs in a UCAN token.
@@ -113,8 +117,20 @@ func (m *Meta) Add(key string, val any) error {
 	case datamodel.Node:
 		m.Values[key] = val
 	default:
-		panic("invalid value type")
+		return fmt.Errorf("%w: %s", ErrUnsupported, fqtn(val))
 	}
 	m.Keys = append(m.Keys, key)
 	return nil
 }
+
+func fqtn(val any) string {
+	var name string
+
+	t := reflect.TypeOf(val)
+	for t.Kind() == reflect.Pointer {
+		name += "*"
+		t = t.Elem()
+	}
+
+	return name + t.PkgPath() + "." + t.Name()
+}

pkg/meta/meta_test.go

@@ -0,0 +1,23 @@
+package meta_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/ucan-wg/go-ucan/pkg/meta"
+	"gotest.tools/v3/assert"
+)
+
+func TestMeta_Add(t *testing.T) {
+	t.Parallel()
+
+	type Unsupported struct{}
+
+	t.Run("error if not primative or Node", func(t *testing.T) {
+		t.Parallel()
+
+		err := (&meta.Meta{}).Add("invalid", &Unsupported{})
+		require.ErrorIs(t, err, meta.ErrUnsupported)
+		assert.ErrorContains(t, err, "*github.com/ucan-wg/go-ucan/pkg/meta_test.Unsupported")
+	})
+}