mab update, !short command, last_access fix

- Updated mab to v0.5.0
- Added `!short` command to add named tokens
- Fixed `last_access_at` field not being updated

database.py

@@ -252,11 +252,17 @@ class Database:
             return None
 
 
-    async def token_create(self) -> ObjectToken:
+    async def token_create(self, code: str | None = None) -> ObjectToken:
         """Create a token."""
         if self._connection is None:
             raise RuntimeError("Not connected to the database")
-        code = get_hash(str(time.time()).encode() + os.urandom(64))
+        if code is None:
+            code = get_hash(str(time.time()).encode() + os.urandom(64))
+        else:
+            if len(code) < 2 or len(code) > 16:
+                raise RuntimeError("Token must be 2-16 symbols long")
+            if not all(ord(c) < 128 and (c.islower() or c.isdigit()) for c in code):
+                raise RuntimeError("Only digits and ASCII lowercase letters are allowed")
         create_time = time.time()
         statement = """
         INSERT INTO tokens (code, name, created_at, last_access_at)
@@ -329,6 +335,17 @@ class Database:
         except:
             self._logger.error(traceback.format_exc())
 
+    async def token_set_last_access(self, code: str, timestamp: float) -> None:
+        """Set last_access_at for the token."""
+        if self._connection is None:
+            raise RuntimeError("Not connected to the database")
+        try:
+            statement = "UPDATE tokens SET last_access_at=? WHERE code=?"
+            await self._connection.execute(statement, (timestamp, code))
+            await self._connection.commit()
+        except:
+            self._logger.error(traceback.format_exc())
+
 
     async def ban_create(self, ip: str, expires_at: float, reason: str) -> None:
         """Save information about banned IP address. Replaces existing IPs."""