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23740eaa3d
During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
96 lines
3.0 KiB
Python
96 lines
3.0 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import logging
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from typing import Optional
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import attr
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from synapse.api.constants import Direction
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from synapse.api.errors import SynapseError
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from synapse.http.servlet import parse_enum, parse_integer, parse_string
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from synapse.http.site import SynapseRequest
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from synapse.storage.databases.main import DataStore
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from synapse.types import StreamToken
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logger = logging.getLogger(__name__)
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MAX_LIMIT = 1000
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@attr.s(slots=True, auto_attribs=True)
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class PaginationConfig:
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"""A configuration object which stores pagination parameters."""
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from_token: Optional[StreamToken]
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to_token: Optional[StreamToken]
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direction: Direction
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limit: int
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@classmethod
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async def from_request(
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cls,
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store: "DataStore",
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request: SynapseRequest,
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default_limit: int,
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default_dir: Direction = Direction.FORWARDS,
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) -> "PaginationConfig":
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direction = parse_enum(request, "dir", Direction, default=default_dir)
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from_tok_str = parse_string(request, "from")
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to_tok_str = parse_string(request, "to")
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try:
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from_tok = None
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if from_tok_str == "END":
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from_tok = None # For backwards compat.
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elif from_tok_str:
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from_tok = await StreamToken.from_string(store, from_tok_str)
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except Exception:
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raise SynapseError(400, "'from' parameter is invalid")
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try:
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to_tok = None
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if to_tok_str:
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to_tok = await StreamToken.from_string(store, to_tok_str)
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except Exception:
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raise SynapseError(400, "'to' parameter is invalid")
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limit = parse_integer(request, "limit", default=default_limit)
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if limit < 0:
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raise SynapseError(400, "Limit must be 0 or above")
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limit = min(limit, MAX_LIMIT)
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try:
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return PaginationConfig(from_tok, to_tok, direction, limit)
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except Exception:
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logger.exception("Failed to create pagination config")
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raise SynapseError(400, "Invalid request.")
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def __repr__(self) -> str:
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return "PaginationConfig(from_tok=%r, to_tok=%r, direction=%r, limit=%r)" % (
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self.from_token,
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self.to_token,
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self.direction,
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self.limit,
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)
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