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+# Copyright 2023 The Matrix.org Foundation C.I.C.
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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 OpenSSL.SSL import Context
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+from twisted.internet import ssl
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+
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+from synapse.config.redis import RedisConfig
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+
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+
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+class ClientContextFactory(ssl.ClientContextFactory):
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+ def __init__(self, redis_config: RedisConfig):
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+ self.redis_config = redis_config
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+
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+ def getContext(self) -> Context:
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+ ctx = super().getContext()
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+ if self.redis_config.redis_certificate:
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+ ctx.use_certificate_file(self.redis_config.redis_certificate)
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+ if self.redis_config.redis_private_key:
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+ ctx.use_privatekey_file(self.redis_config.redis_private_key)
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+ if self.redis_config.redis_ca_file:
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+ ctx.load_verify_locations(cafile=self.redis_config.redis_ca_file)
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+ elif self.redis_config.redis_ca_path:
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+ ctx.load_verify_locations(capath=self.redis_config.redis_ca_path)
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+ return ctx
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