88 lines
3.2 KiB
Python
88 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 OpenMarket Ltd
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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, Codes
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class EventValidator(object):
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def __init__(self, hs):
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pass
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def validate(self, event):
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"""Checks the given JSON content abides by the rules of the template.
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Args:
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content : A JSON object to check.
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raises: True to raise a SynapseError if the check fails.
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Returns:
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True if the content passes the template. Returns False if the check
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fails and raises=False.
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Raises:
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SynapseError if the check fails and raises=True.
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"""
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# recursively call to inspect each layer
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err_msg = self._check_json_template(
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event.content,
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event.get_content_template()
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)
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if err_msg:
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raise SynapseError(400, err_msg, Codes.BAD_JSON)
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else:
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return True
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def _check_json_template(self, content, template):
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"""Check content and template matches.
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If the template is a dict, each key in the dict will be validated with
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the content, else it will just compare the types of content and
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template. This basic type check is required because this function will
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be recursively called and could be called with just strs or ints.
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Args:
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content: The content to validate.
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template: The validation template.
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Returns:
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str: An error message if the validation fails, else None.
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"""
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if type(content) != type(template):
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return "Mismatched types: %s" % template
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if type(template) == dict:
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for key in template:
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if key not in content:
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return "Missing %s key" % key
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if type(content[key]) != type(template[key]):
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return "Key %s is of the wrong type (got %s, want %s)" % (
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key, type(content[key]), type(template[key]))
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if type(content[key]) == dict:
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# we must go deeper
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msg = self._check_json_template(
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content[key],
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template[key]
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)
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if msg:
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return msg
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elif type(content[key]) == list:
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# make sure each item type in content matches the template
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for entry in content[key]:
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msg = self._check_json_template(
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entry,
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template[key][0]
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)
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if msg:
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return msg
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