diff --git a/synapse/util/caches/ttlcache.py b/synapse/util/caches/ttlcache.py
index 2af8ca43b1..99646c7cf0 100644
--- a/synapse/util/caches/ttlcache.py
+++ b/synapse/util/caches/ttlcache.py
@@ -55,7 +55,7 @@ class TTLCache(object):
if e != SENTINEL:
self._expiry_list.remove(e)
- entry = _CacheEntry(expiry_time=expiry, key=key, value=value)
+ entry = _CacheEntry(expiry_time=expiry, ttl=ttl, key=key, value=value)
self._data[key] = entry
self._expiry_list.add(entry)
@@ -87,7 +87,8 @@ class TTLCache(object):
key: key to look up
Returns:
- Tuple[Any, float]: the value from the cache, and the expiry time
+ Tuple[Any, float, float]: the value from the cache, the expiry time
+ and the TTL
Raises:
KeyError if the entry is not found
@@ -99,7 +100,7 @@ class TTLCache(object):
self._metrics.inc_misses()
raise
self._metrics.inc_hits()
- return e.value, e.expiry_time
+ return e.value, e.expiry_time, e.ttl
def pop(self, key, default=SENTINEL):
"""Remove a value from the cache
@@ -158,5 +159,6 @@ class _CacheEntry(object):
# expiry_time is the first attribute, so that entries are sorted by expiry.
expiry_time = attr.ib()
+ ttl = attr.ib()
key = attr.ib()
value = attr.ib()
diff --git a/synapse/util/hash.py b/synapse/util/hash.py
new file mode 100644
index 0000000000..359168704e
--- /dev/null
+++ b/synapse/util/hash.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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.
+
+import hashlib
+
+import unpaddedbase64
+
+
+def sha256_and_url_safe_base64(input_text):
+ """SHA256 hash an input string, encode the digest as url-safe base64, and
+ return
+
+ :param input_text: string to hash
+ :type input_text: str
+
+ :returns a sha256 hashed and url-safe base64 encoded digest
+ :rtype: str
+ """
+ digest = hashlib.sha256(input_text.encode()).digest()
+ return unpaddedbase64.encode_base64(digest, urlsafe=True)
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