Add a version 2 of the key server api

synapse/rest/key/v2/local_key_resource.py

@@ -0,0 +1,118 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014, 2015 OpenMarket Ltd
+#
+# 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 twisted.web.resource import Resource
+from synapse.http.server import respond_with_json_bytes
+from syutil.crypto.jsonsign import sign_json
+from syutil.base64util import encode_base64
+from syutil.jsonutil import encode_canonical_json
+from OpenSSL import crypto
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class LocalKey(Resource):
+    """HTTP resource containing encoding the TLS X.509 certificate and NACL
+    signature verification keys for this server::
+
+        GET /_matrix/key/v2/ HTTP/1.1
+
+        HTTP/1.1 200 OK
+        Content-Type: application/json
+        {
+            "expires": # integer posix timestamp when this result expires.
+            "server_name": "this.server.example.com"
+            "verify_keys": {
+                "algorithm:version": # base64 encoded NACL verification key.
+            },
+            "old_verify_keys": {
+                "algorithm:version": {
+                    "expired": # integer posix timestamp when the key expired.
+                    "key": # base64 encoded NACL verification key.
+                }
+            }
+            "tls_certificate": # base64 ASN.1 DER encoded X.509 tls cert.
+            "signatures": {
+                "this.server.example.com": {
+                   "algorithm:version": # NACL signature for this server
+                }
+            }
+        }
+    """
+
+    def __init__(self, hs):
+        self.version_string = hs.version_string
+        self.config = hs.config
+        self.clock = hs.clock
+        self.update_response_body(self.clock.time_msec())
+        Resource.__init__(self)
+
+    def update_response_body(self, time_now_msec):
+        refresh_interval = self.config.key_refresh_interval
+        self.expires = int(time_now_msec + refresh_interval)
+        self.response_body = encode_canonical_json(self.response_json_object())
+
+
+    def response_json_object(self):
+        verify_keys = {}
+        for key in self.config.signing_key:
+            verify_key_bytes = key.verify_key.encode()
+            key_id = "%s:%s" % (key.alg, key.version)
+            verify_keys[key_id] = encode_base64(verify_key_bytes)
+
+        old_verify_keys = {}
+        for key in self.config.old_signing_keys:
+            key_id = "%s:%s" % (key.alg, key.version)
+            verify_key_bytes = key.encode()
+            old_verify_keys[key_id] = {
+                u"key": encode_base64(verify_key_bytes),
+                u"expired": key.expired,
+            }
+
+        x509_certificate_bytes = crypto.dump_certificate(
+            crypto.FILETYPE_ASN1,
+            self.config.tls_certificate
+        )
+        json_object = {
+            u"expires": self.expires,
+            u"server_name": self.config.server_name,
+            u"verify_keys": verify_keys,
+            u"old_verify_keys": old_verify_keys,
+            u"tls_certificate": encode_base64(x509_certificate_bytes)
+        }
+        for key in self.config.signing_key:
+            json_object = sign_json(
+                json_object,
+                self.config.server_name,
+                key,
+            )
+        return json_object
+
+    def render_GET(self, request):
+        time_now = self.clock.time_msec()
+        # Update the expiry time if less than half the interval remains.
+        if time_now + self.config.key_refresh_interval / 2 > self.expires:
+            self.update_response_body()
+        return respond_with_json_bytes(
+            request, 200, self.response_body,
+            version_string=self.version_string
+        )
+
+    def getChild(self, name, request):
+        if name == '':
+            return self