Fix parsing of old format contact field in wallet (#589)

* wallet parse contact field if its old format

* default checks for contacts

cashu/core/models.py

@@ -1,6 +1,6 @@
 from typing import Any, Dict, List, Optional, Union
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, root_validator
 
 from .base import (
     BlindedMessage,
@@ -43,6 +43,21 @@ class GetInfoResponse(BaseModel):
     def supports(self, nut: int) -> Optional[bool]:
         return nut in self.nuts if self.nuts else None
 
+    # BEGIN DEPRECATED: NUT-06 contact field change
+    # NUT-06 PR: https://github.com/cashubtc/nuts/pull/117
+    @root_validator(pre=True)
+    def preprocess_deprecated_contact_field(cls, values):
+        if "contact" in values and values["contact"]:
+            if isinstance(values["contact"][0], list):
+                values["contact"] = [
+                    MintInfoContact(method=method, info=info)
+                    for method, info in values["contact"]
+                    if method and info
+                ]
+        return values
+
+    # END DEPRECATED: NUT-06 contact field change
+
 
 class Nut15MppSupport(BaseModel):
     method: str

cashu/core/settings.py

@@ -142,7 +142,7 @@ class MintInformation(CashuSettings):
     mint_info_name: str = Field(default="Cashu mint")
     mint_info_description: str = Field(default=None)
     mint_info_description_long: str = Field(default=None)
-    mint_info_contact: List[List[str]] = Field(default=[["", ""]])
+    mint_info_contact: List[List[str]] = Field(default=[])
     mint_info_motd: str = Field(default=None)
 
 

cashu/mint/router.py

@@ -43,7 +43,9 @@ async def info() -> GetInfoResponse:
     logger.trace("> GET /v1/info")
     mint_features = ledger.mint_features()
     contact_info = [
-        MintInfoContact(method=m, info=i) for m, i in settings.mint_info_contact
+        MintInfoContact(method=m, info=i)
+        for m, i in settings.mint_info_contact
+        if m and i
     ]
     return GetInfoResponse(
         name=settings.mint_info_name,