invoices: make sure that OnchainInvoice .exp and .time are not None

related: #6284

electrum/invoices.py

@@ -113,9 +113,9 @@ class Invoice(StoredObject):
 @attr.s
 class OnchainInvoice(Invoice):
     message = attr.ib(type=str, kw_only=True)
-    amount_sat = attr.ib(kw_only=True)  # type: Union[None, int, str]  # in satoshis. can be '!'
-    exp = attr.ib(type=int, kw_only=True)
-    time = attr.ib(type=int, kw_only=True)
+    amount_sat = attr.ib(kw_only=True)  # type: Union[int, str]  # in satoshis. can be '!'
+    exp = attr.ib(type=int, kw_only=True, validator=attr.validators.instance_of(int))
+    time = attr.ib(type=int, kw_only=True, validator=attr.validators.instance_of(int))
     id = attr.ib(type=str, kw_only=True)
     outputs = attr.ib(kw_only=True, converter=_decode_outputs)  # type: List[PartialTxOutput]
     bip70 = attr.ib(type=str, kw_only=True)  # type: Optional[str]

electrum/wallet.py

@@ -691,14 +691,21 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
             amount = '!'
         else:
             amount = sum(x.value for x in outputs)
+        timestamp = None
+        exp = None
+        if URI:
+            timestamp = URI.get('time')
+            exp = URI.get('exp')
+        timestamp = timestamp or int(time.time())
+        exp = exp or 0
         invoice = OnchainInvoice(
             type=PR_TYPE_ONCHAIN,
             amount_sat=amount,
             outputs=outputs,
             message=message,
             id=bh2u(sha256(repr(outputs))[0:16]),
-            time=URI.get('time') if URI else int(time.time()),
-            exp=URI.get('exp') if URI else 0,
+            time=timestamp,
+            exp=exp,
             bip70=None,
             requestor=None,
         )
@@ -1776,6 +1783,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         amount_sat = amount_sat or 0
         timestamp = int(time.time())
         _id = bh2u(sha256d(address + "%d"%timestamp))[0:10]
+        expiration = expiration or 0
         return OnchainInvoice(
             type=PR_TYPE_ONCHAIN,
             outputs=[(TYPE_ADDRESS, address, amount_sat)],

electrum/wallet_db.py

@@ -52,7 +52,7 @@ if TYPE_CHECKING:
 
 OLD_SEED_VERSION = 4        # electrum versions < 2.0
 NEW_SEED_VERSION = 11       # electrum versions >= 2.0
-FINAL_SEED_VERSION = 30     # electrum >= 2.7 will set this to prevent
+FINAL_SEED_VERSION = 31     # electrum >= 2.7 will set this to prevent
                             # old versions from overwriting new format
 
 
@@ -178,6 +178,7 @@ class WalletDB(JsonDB):
         self._convert_version_28()
         self._convert_version_29()
         self._convert_version_30()
+        self._convert_version_31()
         self.put('seed_version', FINAL_SEED_VERSION)  # just to be sure
 
         self._after_upgrade_tasks()
@@ -667,6 +668,21 @@ class WalletDB(JsonDB):
                     raise Exception(f"unknown invoice type: {_type}")
         self.data['seed_version'] = 30
 
+    def _convert_version_31(self):
+        if not self._is_upgrade_method_needed(30, 30):
+            return
+
+        from .invoices import PR_TYPE_ONCHAIN
+        requests = self.data.get('payment_requests', {})
+        invoices = self.data.get('invoices', {})
+        for d in [invoices, requests]:
+            for key, item in list(d.items()):
+                if item['type'] == PR_TYPE_ONCHAIN:
+                    item['amount_sat'] = item['amount_sat'] or 0
+                    item['exp'] = item['exp'] or 0
+                    item['time'] = item['time'] or 0
+        self.data['seed_version'] = 31
+
     def _convert_imported(self):
         if not self._is_upgrade_method_needed(0, 13):
             return