mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-09-08 06:41:57 +00:00
73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014 matrix.org
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
from synapse.api.errors import SynapseError
|
|
from synapse.types import StreamToken
|
|
|
|
import logging
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class PaginationConfig(object):
|
|
|
|
"""A configuration object which stores pagination parameters."""
|
|
|
|
def __init__(self, from_tok=None, to_tok=None, direction='f', limit=0):
|
|
self.from_token = StreamToken.from_string(from_tok) if from_tok else None
|
|
self.to_token = StreamToken.from_string(to_tok) if to_tok else None
|
|
self.direction = 'f' if direction == 'f' else 'b'
|
|
self.limit = int(limit)
|
|
|
|
@classmethod
|
|
def from_request(cls, request, raise_invalid_params=True):
|
|
params = {
|
|
"direction": 'f',
|
|
}
|
|
|
|
query_param_mappings = [ # 3-tuple of qp_key, attribute, rules
|
|
("from", "from_tok", lambda x: type(x) == str),
|
|
("to", "to_tok", lambda x: type(x) == str),
|
|
("limit", "limit", lambda x: x.isdigit()),
|
|
("dir", "direction", lambda x: x == 'f' or x == 'b'),
|
|
]
|
|
|
|
for qp, attr, is_valid in query_param_mappings:
|
|
if qp in request.args:
|
|
if is_valid(request.args[qp][0]):
|
|
params[attr] = request.args[qp][0]
|
|
elif raise_invalid_params:
|
|
raise SynapseError(400, "%s parameter is invalid." % qp)
|
|
|
|
if "from_tok" in params and params["from_tok"] == "END":
|
|
# TODO (erikj): This is for compatibility only.
|
|
del params["from_tok"]
|
|
|
|
try:
|
|
return PaginationConfig(**params)
|
|
except:
|
|
logger.exception("Failed to create pagination config")
|
|
raise SynapseError(400, "Invalid request.")
|
|
|
|
def __str__(self):
|
|
return (
|
|
"<PaginationConfig from_tok=%s, to_tok=%s, "
|
|
"direction=%s, limit=%s>"
|
|
) % (self.from_tok, self.to_tok, self.direction, self.limit)
|
|
|
|
|
|
|