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go/pkg/zerotier/blob.go

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c)2019 ZeroTier, Inc.
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file in the project's root directory.
+ *
+ * Change Date: 2023-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2.0 of the Apache License.
+ */
+/****/
+
+package zerotier
+
+// This is copied from the LF code base to make JSON blob encoding uniform
+
+import (
+	"encoding/json"
+	"unicode/utf8"
+)
+
+// Blob is a byte array that serializes to a string or a base62 string prefixed by \b (binary)
+type Blob []byte
+
+// MarshalJSON returns this blob marshaled as a string using \b<base62> for non-UTF8 binary data.
+func (b Blob) MarshalJSON() ([]byte, error) {
+	if utf8.Valid(b) {
+		return json.Marshal(string(b))
+	}
+	return []byte("\"\\b" + Base62Encode(b) + "\""), nil
+}
+
+// UnmarshalJSON unmarshals this blob from a string or byte array.
+func (b *Blob) UnmarshalJSON(j []byte) error {
+	var s string
+	err := json.Unmarshal(j, &s)
+	if err == nil {
+		if len(s) == 0 {
+			*b = nil
+		} else if s[0] == '\b' {
+			*b = Base62Decode(s[1:])
+			return nil
+		}
+		*b = []byte(s)
+		return nil
+	}
+
+	// Byte arrays are also accepted
+	var bb []byte
+	if json.Unmarshal(j, &bb) != nil {
+		return err
+	}
+	*b = bb
+	return nil
+}