24 lines
735 B
Python
24 lines
735 B
Python
 
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"""Keyset cursor helpers for thread listings (SPEC §9.1: cursor = last_message_at,id)."""
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from __future__ import annotations
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import base64
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import datetime as dt
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import uuid
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def encode_cursor(last_message_at: dt.datetime, thread_id: uuid.UUID) -> str:
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raw = f"{last_message_at.isoformat()}|{thread_id}"
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return base64.urlsafe_b64encode(raw.encode()).decode()
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def decode_cursor(cursor: str | None) -> tuple[dt.datetime, uuid.UUID] | None:
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if not cursor:
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return None
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try:
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raw = base64.urlsafe_b64decode(cursor.encode()).decode()
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date_str, id_str = raw.split("|", 1)
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return dt.datetime.fromisoformat(date_str), uuid.UUID(id_str)
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except (ValueError, TypeError):
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return None
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