wallet can now handle PostMeltResponse_deprecated from v1 api (#642)

cashu/wallet/v1_api.py

@@ -7,6 +7,7 @@ import bolt11
 import httpx
 from httpx import Response
 from loguru import logger
+from pydantic import ValidationError
 
 from ..core.base import (
     BlindedMessage,
@@ -467,6 +468,11 @@ class LedgerAPI(LedgerAPIDeprecated):
             json=payload.dict(include=_meltrequest_include_fields(proofs, outputs)),  # type: ignore
             timeout=None,
         )
+        try:
+            self.raise_on_error_request(resp)
+            return_dict = resp.json()
+            return PostMeltQuoteResponse.parse_obj(return_dict)
+        except Exception as e:
             # BEGIN backwards compatibility < 0.15.0
             # assume the mint has not upgraded yet if we get a 404
             if resp.status_code == 404:
@@ -475,6 +481,13 @@ class LedgerAPI(LedgerAPIDeprecated):
                 ret: PostMeltResponse_deprecated = await self.melt_deprecated(
                     proofs=proofs, outputs=outputs, invoice=invoice.bolt11
                 )
+            elif isinstance(e, ValidationError):
+                # BEGIN backwards compatibility < 0.16.0
+                # before 0.16.0, mints return PostMeltResponse_deprecated
+                ret = PostMeltResponse_deprecated.parse_obj(return_dict)
+                # END backwards compatibility < 0.16.0
+            else:
+                raise e
             return PostMeltQuoteResponse(
                 quote=quote,
                 amount=0,
@@ -490,9 +503,6 @@ class LedgerAPI(LedgerAPIDeprecated):
                 expiry=None,
             )
             # END backwards compatibility < 0.15.0
-        self.raise_on_error_request(resp)
-        return_dict = resp.json()
-        return PostMeltQuoteResponse.parse_obj(return_dict)
 
     @async_set_httpx_client
     @async_ensure_mint_loaded