Allow backslashes in event field filters

Fixes a bug introduced in https://github.com/matrix-org/synapse/pull/1783 which
meant that single backslashes were not allowed in event field filters.

The intention here is to allow single-backslashes, but disallow
double-backslashes.
This commit is contained in:
Richard van der Hoff 2018-10-24 10:41:45 +01:00
parent e0b9d5f0af
commit 7e07d25ed6
3 changed files with 16 additions and 2 deletions

1
changelog.d/4083.bugfix Normal file
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@ -0,0 +1 @@
Fix bug which prevented backslashes being used in event field filters

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@ -172,7 +172,10 @@ USER_FILTER_SCHEMA = {
# events a lot easier as we can then use a negative lookbehind
# assertion to split '\.' If we allowed \\ then it would
# incorrectly split '\\.' See synapse.events.utils.serialize_event
"pattern": "^((?!\\\).)*$"
#
# Note that because this is a regular expression, we have to escape
# each backslash in the pattern.
"pattern": r"^((?!\\\\).)*$"
}
}
},

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@ -60,7 +60,7 @@ class FilteringTestCase(unittest.TestCase):
invalid_filters = [
{"boom": {}},
{"account_data": "Hello World"},
{"event_fields": ["\\foo"]},
{"event_fields": [r"\\foo"]},
{"room": {"timeline": {"limit": 0}, "state": {"not_bars": ["*"]}}},
{"event_format": "other"},
{"room": {"not_rooms": ["#foo:pik-test"]}},
@ -109,6 +109,16 @@ class FilteringTestCase(unittest.TestCase):
"event_format": "client",
"event_fields": ["type", "content", "sender"],
},
# a single backslash should be permitted (though it is debatable whether
# it should be permitted before anything other than `.`, and what that
# actually means)
#
# (note that event_fields is implemented in
# synapse.events.utils.serialize_event, and so whether this actually works
# is tested elsewhere. We just want to check that it is allowed through the
# filter validation)
{"event_fields": [r"foo\.bar"]},
]
for filter in valid_filters:
try: