synapse-product/synapse/util/templates.py
Patrick Cloke 01c88a09cd
Use direct references for some configuration variables ()
Instead of proxying through the magic getter of the RootConfig
object. This should be more performant (and is more explicit).
2021-09-13 13:07:12 -04:00

115 lines
3.7 KiB
Python

# Copyright 2021 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.
"""Utilities for dealing with jinja2 templates"""
import time
import urllib.parse
from typing import TYPE_CHECKING, Callable, Optional, Sequence, Union
import jinja2
if TYPE_CHECKING:
from synapse.config.homeserver import HomeServerConfig
def build_jinja_env(
template_search_directories: Sequence[str],
config: "HomeServerConfig",
autoescape: Union[bool, Callable[[Optional[str]], bool], None] = None,
) -> jinja2.Environment:
"""Set up a Jinja2 environment to load templates from the given search path
The returned environment defines the following filters:
- format_ts: formats timestamps as strings in the server's local timezone
(XXX: why is that useful??)
- mxc_to_http: converts mxc: uris to http URIs. Args are:
(uri, width, height, resize_method="crop")
and the following global variables:
- server_name: matrix server name
Args:
template_search_directories: directories to search for templates
config: homeserver config, for things like `server_name` and `public_baseurl`
autoescape: whether template variables should be autoescaped. bool, or
a function mapping from template name to bool. Defaults to escaping templates
whose names end in .html, .xml or .htm.
Returns:
jinja environment
"""
if autoescape is None:
autoescape = jinja2.select_autoescape()
loader = jinja2.FileSystemLoader(template_search_directories)
env = jinja2.Environment(loader=loader, autoescape=autoescape)
# Update the environment with our custom filters
env.filters.update(
{
"format_ts": _format_ts_filter,
"mxc_to_http": _create_mxc_to_http_filter(config.server.public_baseurl),
}
)
# common variables for all templates
env.globals.update({"server_name": config.server.server_name})
return env
def _create_mxc_to_http_filter(
public_baseurl: Optional[str],
) -> Callable[[str, int, int, str], str]:
"""Create and return a jinja2 filter that converts MXC urls to HTTP
Args:
public_baseurl: The public, accessible base URL of the homeserver
"""
def mxc_to_http_filter(
value: str, width: int, height: int, resize_method: str = "crop"
) -> str:
if not public_baseurl:
raise RuntimeError(
"public_baseurl must be set in the homeserver config to convert MXC URLs to HTTP URLs."
)
if value[0:6] != "mxc://":
return ""
server_and_media_id = value[6:]
fragment = None
if "#" in server_and_media_id:
server_and_media_id, fragment = server_and_media_id.split("#", 1)
fragment = "#" + fragment
params = {"width": width, "height": height, "method": resize_method}
return "%s_matrix/media/v1/thumbnail/%s?%s%s" % (
public_baseurl,
server_and_media_id,
urllib.parse.urlencode(params),
fragment or "",
)
return mxc_to_http_filter
def _format_ts_filter(value: int, format: str) -> str:
return time.strftime(format, time.localtime(value / 1000))