Blind authentication (#675)

* auth server

* cleaning up

* auth ledger class

* class variables -> instance variables

* annotations

* add models and api route

* custom amount and api prefix

* add auth db

* blind auth token working

* jwt working

* clean up

* JWT works

* using openid connect server

* use oauth server with password flow

* new realm

* add keycloak docker

* hopefully not garbage

* auth works

* auth kinda working

* fix cli

* auth works for send and receive

* pass auth_db to Wallet

* auth in info

* refactor

* fix supported

* cache mint info

* fix settings and endpoints

* add description to .env.example

* track changes for openid connect client

* store mint in db

* store credentials

* clean up v1_api.py

* load mint info into auth wallet

* fix first login

* authenticate if refresh token fails

* clear auth also middleware

* use regex

* add cli command

* pw works

* persist keyset amounts

* add errors.py

* do not start auth server if disabled in config

* upadte poetry

* disvoery url

* fix test

* support device code flow

* adopt latest spec changes

* fix code flow

* mint max bat dynamic

* mypy ignore

* fix test

* do not serialize amount in authproof

* all auth flows working

* fix tests

* submodule

* refactor

* test

* dont sleep

* test

* add wallet auth tests

* test differently

* test only keycloak for now

* fix creds

* daemon

* fix test

* install everything

* install jinja

* delete wallet for every test

* auth: use global rate limiter

* test auth rate limit

* keycloak hostname

* move keycloak test data

* reactivate all tests

* add readme

* load proofs

* remove unused code

* remove unused code

* implement change suggestions by ok300

* add error codes

* test errors

cashu/core/db.py

@@ -339,11 +339,21 @@ class Database(Compat):
             raise Exception("Timestamp is None")
         return timestamp
 
-    def to_timestamp(self, timestamp_str: str) -> Union[str, datetime.datetime]:
-        if not timestamp_str:
-            timestamp_str = self.timestamp_now_str()
+    def to_timestamp(
+        self, timestamp: Union[str, datetime.datetime]
+    ) -> Union[str, datetime.datetime]:
+        if not timestamp:
+            timestamp = self.timestamp_now_str()
         if self.type in {POSTGRES, COCKROACH}:
-            return datetime.datetime.strptime(timestamp_str, "%Y-%m-%d %H:%M:%S")
+            # return datetime.datetime
+            if isinstance(timestamp, datetime.datetime):
+                return timestamp
+            elif isinstance(timestamp, str):
+                return datetime.datetime.strptime(timestamp, "%Y-%m-%d %H:%M:%S")
         elif self.type == SQLITE:
-            return timestamp_str
+            # return str
+            if isinstance(timestamp, datetime.datetime):
+                return timestamp.strftime("%Y-%m-%d %H:%M:%S")
+            elif isinstance(timestamp, str):
+                return timestamp
         return "<nothing>"