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72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 matrix.org
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from synapse.api.errors import SynapseError
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from synapse.types import StreamToken
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import logging
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logger = logging.getLogger(__name__)
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class PaginationConfig(object):
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"""A configuration object which stores pagination parameters."""
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def __init__(self, from_tok=None, to_tok=None, direction='f', limit=0):
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self.from_token = (
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StreamToken.from_string(from_tok) if from_tok else None
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)
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self.to_token = StreamToken.from_string(to_tok) if to_tok else None
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self.direction = 'f' if direction == 'f' else 'b'
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self.limit = int(limit)
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@classmethod
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def from_request(cls, request, raise_invalid_params=True):
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params = {
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"direction": 'f',
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}
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query_param_mappings = [ # 3-tuple of qp_key, attribute, rules
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("from", "from_tok", lambda x: type(x) == str),
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("to", "to_tok", lambda x: type(x) == str),
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("limit", "limit", lambda x: x.isdigit()),
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("dir", "direction", lambda x: x == 'f' or x == 'b'),
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]
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for qp, attr, is_valid in query_param_mappings:
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if qp in request.args:
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if is_valid(request.args[qp][0]):
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params[attr] = request.args[qp][0]
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elif raise_invalid_params:
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raise SynapseError(400, "%s parameter is invalid." % qp)
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if "from_tok" in params and params["from_tok"] == "END":
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# TODO (erikj): This is for compatibility only.
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del params["from_tok"]
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try:
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return PaginationConfig(**params)
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except:
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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 __str__(self):
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return (
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"<PaginationConfig from_tok=%s, to_tok=%s, "
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"direction=%s, limit=%s>"
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) % (self.from_tok, self.to_tok, self.direction, self.limit)
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