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venv/lib/python3.9/site-packages/graphql_relay/utils/base64.py

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+from base64 import b64encode, b64decode
+import binascii
+
+__all__ = ["base64", "unbase64"]
+
+Base64String = str
+
+
+def base64(s: str) -> Base64String:
+    """Encode the string s using Base64."""
+    b: bytes = s.encode("utf-8") if isinstance(s, str) else s
+    return b64encode(b).decode("ascii")
+
+
+def unbase64(s: Base64String) -> str:
+    """Decode the string s using Base64."""
+    try:
+        b: bytes = s.encode("ascii") if isinstance(s, str) else s
+    except UnicodeEncodeError:
+        return ""
+    try:
+        return b64decode(b).decode("utf-8")
+    except (binascii.Error, UnicodeDecodeError):
+        return ""