add compat

cashu/wallet/compat.py

@@ -0,0 +1,49 @@
+import base64
+
+from loguru import logger
+
+from ..core.crypto.keys import derive_keyset_id
+from ..core.db import Database
+from ..core.settings import settings
+from .crud import (
+    get_keysets,
+    update_keyset,
+)
+from .protocols import SupportsDb, SupportsMintURL
+
+
+class WalletCompat(SupportsDb, SupportsMintURL):
+    db: Database
+
+    async def inactivate_base64_keysets(self, force_old_keysets: bool) -> None:
+        # BEGIN backwards compatibility: phase out keysets with base64 ID by treating them as inactive
+        if settings.wallet_inactivate_base64_keysets and not force_old_keysets:
+            keysets_in_db = await get_keysets(mint_url=self.url, db=self.db)
+            for keyset in keysets_in_db:
+                if not keyset.active:
+                    continue
+                # test if the keyset id is a hex string, if not it's base64
+                try:
+                    int(keyset.id, 16)
+                except ValueError:
+                    # verify that it's base64
+                    try:
+                        _ = base64.b64decode(keyset.id)
+                    except ValueError:
+                        logger.error("Unexpected: keyset id is neither hex nor base64.")
+                        continue
+
+                    # verify that we have a hex version of the same keyset by comparing public keys
+                    hex_keyset_id = derive_keyset_id(keys=keyset.public_keys)
+                    if hex_keyset_id not in [k.id for k in keysets_in_db]:
+                        logger.warning(
+                            f"Keyset {keyset.id} is base64 but we don't have a hex version. Ignoring."
+                        )
+                        continue
+
+                    logger.warning(
+                        f"Keyset {keyset.id} is base64 and has a hex counterpart, setting inactive."
+                    )
+                    keyset.active = False
+                    await update_keyset(keyset=keyset, db=self.db)
+        # END backwards compatibility