Merge tag 'v0.34.1rc1' into matrix-org-hotfixes

Synapse 0.34.1rc1 (2019-01-08)
==============================

Features
--------

- Special-case a support user for use in verifying behaviour of a given server. The support user does not appear in user directory or monthly active user counts. ([\#4141](https://github.com/matrix-org/synapse/issues/4141), [\#4344](https://github.com/matrix-org/synapse/issues/4344))
- Support for serving .well-known files ([\#4262](https://github.com/matrix-org/synapse/issues/4262))
- Rework SAML2 authentication ([\#4265](https://github.com/matrix-org/synapse/issues/4265), [\#4267](https://github.com/matrix-org/synapse/issues/4267))
- SAML2 authentication: Initialise user display name from SAML2 data ([\#4272](https://github.com/matrix-org/synapse/issues/4272))
- Synapse can now have its conditional/extra dependencies installed by pip. This functionality can be used by using `pip install matrix-synapse[feature]`, where feature is a comma separated list with the possible values `email.enable_notifs`, `matrix-synapse-ldap3`, `postgres`, `resources.consent`, `saml2`, `url_preview`, and `test`. If you want to install all optional dependencies, you can use "all" instead. ([\#4298](https://github.com/matrix-org/synapse/issues/4298), [\#4325](https://github.com/matrix-org/synapse/issues/4325), [\#4327](https://github.com/matrix-org/synapse/issues/4327))
- Add routes for reading account data. ([\#4303](https://github.com/matrix-org/synapse/issues/4303))
- Add opt-in support for v2 rooms ([\#4307](https://github.com/matrix-org/synapse/issues/4307))
- Add a script to generate a clean config file ([\#4315](https://github.com/matrix-org/synapse/issues/4315))
- Return server data in /login response ([\#4319](https://github.com/matrix-org/synapse/issues/4319))

Bugfixes
--------

- Fix contains_url check to be consistent with other instances in code-base and check that value is an instance of string. ([\#3405](https://github.com/matrix-org/synapse/issues/3405))
- Fix CAS login when username is not valid in an MXID ([\#4264](https://github.com/matrix-org/synapse/issues/4264))
- Send CORS headers for /media/config ([\#4279](https://github.com/matrix-org/synapse/issues/4279))
- Add 'sandbox' to CSP for media reprository ([\#4284](https://github.com/matrix-org/synapse/issues/4284))
- Make the new landing page prettier. ([\#4294](https://github.com/matrix-org/synapse/issues/4294))
- Fix deleting E2E room keys when using old SQLite versions. ([\#4295](https://github.com/matrix-org/synapse/issues/4295))
- The metric synapse_admin_mau:current previously did not update when config.mau_stats_only was set to True ([\#4305](https://github.com/matrix-org/synapse/issues/4305))
- Fixed per-room account data filters ([\#4309](https://github.com/matrix-org/synapse/issues/4309))
- Fix indentation in default config ([\#4313](https://github.com/matrix-org/synapse/issues/4313))
- Fix synapse:latest docker upload ([\#4316](https://github.com/matrix-org/synapse/issues/4316))
- Fix test_metric.py compatibility with prometheus_client 0.5. Contributed by Maarten de Vries <maarten@de-vri.es>. ([\#4317](https://github.com/matrix-org/synapse/issues/4317))
- Avoid packaging _trial_temp directory in -py3 debian packages ([\#4326](https://github.com/matrix-org/synapse/issues/4326))
- Check jinja version for consent resource ([\#4327](https://github.com/matrix-org/synapse/issues/4327))
- fix NPE in /messages by checking if all events were filtered out ([\#4330](https://github.com/matrix-org/synapse/issues/4330))
- Fix `python -m synapse.config` on Python 3. ([\#4356](https://github.com/matrix-org/synapse/issues/4356))

Deprecations and Removals
-------------------------

- Remove the deprecated v1/register API on Python 2. It was never ported to Python 3. ([\#4334](https://github.com/matrix-org/synapse/issues/4334))

Internal Changes
----------------

- Getting URL previews of IP addresses no longer fails on Python 3. ([\#4215](https://github.com/matrix-org/synapse/issues/4215))
- drop undocumented dependency on dateutil ([\#4266](https://github.com/matrix-org/synapse/issues/4266))
- Update the example systemd config to use a virtualenv ([\#4273](https://github.com/matrix-org/synapse/issues/4273))
- Update link to kernel DCO guide ([\#4274](https://github.com/matrix-org/synapse/issues/4274))
- Make isort tox check print diff when it fails ([\#4283](https://github.com/matrix-org/synapse/issues/4283))
- Log room_id in Unknown room errors ([\#4297](https://github.com/matrix-org/synapse/issues/4297))
- Documentation improvements for coturn setup. Contributed by Krithin Sitaram. ([\#4333](https://github.com/matrix-org/synapse/issues/4333))
- Update pull request template to use absolute links ([\#4341](https://github.com/matrix-org/synapse/issues/4341))
- Update README to not lie about required restart when updating TLS certificates ([\#4343](https://github.com/matrix-org/synapse/issues/4343))
- Update debian packaging for compatibility with transitional package ([\#4349](https://github.com/matrix-org/synapse/issues/4349))
- Fix command hint to generate a config file when trying to start without a config file ([\#4353](https://github.com/matrix-org/synapse/issues/4353))
- Add better logging for unexpected errors while sending transactions ([\#4358](https://github.com/matrix-org/synapse/issues/4358))

1 files changed, 66 insertions, 0 deletions

diff --git a/synapse/types.py b/synapse/types.py

index 41afb27a74..d8cb64addb 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -12,6 +12,7 @@
 # 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 re
 import string
 from collections import namedtuple
 
@@ -228,6 +229,71 @@ def contains_invalid_mxid_characters(localpart):
     return any(c not in mxid_localpart_allowed_characters for c in localpart)
 
 
+UPPER_CASE_PATTERN = re.compile(b"[A-Z_]")
+
+# the following is a pattern which matches '=', and bytes which are not allowed in a mxid
+# localpart.
+#
+# It works by:
+#  * building a string containing the allowed characters (excluding '=')
+#  * escaping every special character with a backslash (to stop '-' being interpreted as a
+#    range operator)
+#  * wrapping it in a '[^...]' regex
+#  * converting the whole lot to a 'bytes' sequence, so that we can use it to match
+#    bytes rather than strings
+#
+NON_MXID_CHARACTER_PATTERN = re.compile(
+    ("[^%s]" % (
+        re.escape("".join(mxid_localpart_allowed_characters - {"="}),),
+    )).encode("ascii"),
+)
+
+
+def map_username_to_mxid_localpart(username, case_sensitive=False):
+    """Map a username onto a string suitable for a MXID
+
+    This follows the algorithm laid out at
+    https://matrix.org/docs/spec/appendices.html#mapping-from-other-character-sets.
+
+    Args:
+        username (unicode|bytes): username to be mapped
+        case_sensitive (bool): true if TEST and test should be mapped
+            onto different mxids
+
+    Returns:
+        unicode: string suitable for a mxid localpart
+    """
+    if not isinstance(username, bytes):
+        username = username.encode('utf-8')
+
+    # first we sort out upper-case characters
+    if case_sensitive:
+        def f1(m):
+            return b"_" + m.group().lower()
+
+        username = UPPER_CASE_PATTERN.sub(f1, username)
+    else:
+        username = username.lower()
+
+    # then we sort out non-ascii characters
+    def f2(m):
+        g = m.group()[0]
+        if isinstance(g, str):
+            # on python 2, we need to do a ord(). On python 3, the
+            # byte itself will do.
+            g = ord(g)
+        return b"=%02x" % (g,)
+
+    username = NON_MXID_CHARACTER_PATTERN.sub(f2, username)
+
+    # we also do the =-escaping to mxids starting with an underscore.
+    username = re.sub(b'^_', b'=5f', username)
+
+    # we should now only have ascii bytes left, so can decode back to a
+    # unicode.
+    return username.decode('ascii')
+
+
 class StreamToken(
     namedtuple("Token", (
         "room_key",