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4167494c90
There's some prelimiary work here to pull out the construction of a jinja environment to a separate function. I wanted to load the template at display time rather than load time, so that it's easy to update on the fly. Honestly, I think we should do this with all our templates: the risk of ending up with malformed templates is far outweighed by the improved turnaround time for an admin trying to update them.
107 lines
3.4 KiB
Python
107 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2021 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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"""Utilities for dealing with jinja2 templates"""
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import time
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import urllib.parse
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from typing import TYPE_CHECKING, Callable, Iterable, Union
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import jinja2
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if TYPE_CHECKING:
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from synapse.config.homeserver import HomeServerConfig
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def build_jinja_env(
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template_search_directories: Iterable[str],
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config: "HomeServerConfig",
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autoescape: Union[bool, Callable[[str], bool], None] = None,
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) -> jinja2.Environment:
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"""Set up a Jinja2 environment to load templates from the given search path
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The returned environment defines the following filters:
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- format_ts: formats timestamps as strings in the server's local timezone
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(XXX: why is that useful??)
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- mxc_to_http: converts mxc: uris to http URIs. Args are:
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(uri, width, height, resize_method="crop")
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and the following global variables:
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- server_name: matrix server name
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Args:
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template_search_directories: directories to search for templates
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config: homeserver config, for things like `server_name` and `public_baseurl`
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autoescape: whether template variables should be autoescaped. bool, or
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a function mapping from template name to bool. Defaults to escaping templates
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whose names end in .html, .xml or .htm.
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Returns:
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jinja environment
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"""
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if autoescape is None:
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autoescape = jinja2.select_autoescape()
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loader = jinja2.FileSystemLoader(template_search_directories)
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env = jinja2.Environment(loader=loader, autoescape=autoescape)
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# Update the environment with our custom filters
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env.filters.update(
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{
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"format_ts": _format_ts_filter,
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"mxc_to_http": _create_mxc_to_http_filter(config.public_baseurl),
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}
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)
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# common variables for all templates
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env.globals.update({"server_name": config.server_name})
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return env
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def _create_mxc_to_http_filter(public_baseurl: str) -> Callable:
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"""Create and return a jinja2 filter that converts MXC urls to HTTP
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Args:
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public_baseurl: The public, accessible base URL of the homeserver
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"""
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def mxc_to_http_filter(value, width, height, resize_method="crop"):
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if value[0:6] != "mxc://":
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return ""
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server_and_media_id = value[6:]
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fragment = None
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if "#" in server_and_media_id:
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server_and_media_id, fragment = server_and_media_id.split("#", 1)
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fragment = "#" + fragment
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params = {"width": width, "height": height, "method": resize_method}
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return "%s_matrix/media/v1/thumbnail/%s?%s%s" % (
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public_baseurl,
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server_and_media_id,
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urllib.parse.urlencode(params),
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fragment or "",
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)
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return mxc_to_http_filter
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def _format_ts_filter(value: int, format: str):
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return time.strftime(format, time.localtime(value / 1000))
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