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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 matrix.org
#
# 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 ._base import Config, ConfigError
from collections import namedtuple
MISSING_NETADDR = (
"Missing netaddr library. This is required for URL preview API."
)
MISSING_LXML = (
"Missing lxml library. This is required for URL preview API."
)
ThumbnailRequirement = namedtuple(
"ThumbnailRequirement", ["width", "height", "method", "media_type"]
)
def parse_thumbnail_requirements(thumbnail_sizes):
""" Takes a list of dictionaries with "width", "height", and "method" keys
and creates a map from image media types to the thumbnail size, thumbnailing
method, and thumbnail media type to precalculate
Args:
thumbnail_sizes(list): List of dicts with "width", "height", and
"method" keys
Returns:
Dictionary mapping from media type string to list of
ThumbnailRequirement tuples.
"""
requirements = {}
for size in thumbnail_sizes:
width = size["width"]
height = size["height"]
method = size["method"]
jpeg_thumbnail = ThumbnailRequirement(width, height, method, "image/jpeg")
png_thumbnail = ThumbnailRequirement(width, height, method, "image/png")
requirements.setdefault("image/jpeg", []).append(jpeg_thumbnail)
requirements.setdefault("image/gif", []).append(png_thumbnail)
requirements.setdefault("image/png", []).append(png_thumbnail)
return {
media_type: tuple(thumbnails)
for media_type, thumbnails in requirements.items()
}
class ContentRepositoryConfig(Config):
def read_config(self, config):
self.max_upload_size = self.parse_size(config["max_upload_size"])
self.max_image_pixels = self.parse_size(config["max_image_pixels"])
self.max_spider_size = self.parse_size(config["max_spider_size"])
self.media_store_path = self.ensure_directory(config["media_store_path"])
self.uploads_path = self.ensure_directory(config["uploads_path"])
self.dynamic_thumbnails = config["dynamic_thumbnails"]
self.thumbnail_requirements = parse_thumbnail_requirements(
config["thumbnail_sizes"]
)
self.url_preview_enabled = config.get("url_preview_enabled", False)
if self.url_preview_enabled:
try:
import lxml
lxml # To stop unused lint.
except ImportError:
raise ConfigError(MISSING_LXML)
try:
from netaddr import IPSet
except ImportError:
raise ConfigError(MISSING_NETADDR)
if "url_preview_ip_range_blacklist" in config:
self.url_preview_ip_range_blacklist = IPSet(
config["url_preview_ip_range_blacklist"]
)
else:
raise ConfigError("url_preview_url_blacklist is required")
if "url_preview_url_blacklist" in config:
self.url_preview_url_blacklist = config["url_preview_url_blacklist"]
def default_config(self, **kwargs):
media_store = self.default_path("media_store")
uploads_path = self.default_path("uploads")
return """
# Directory where uploaded images and attachments are stored.
media_store_path: "%(media_store)s"
# Directory where in-progress uploads are stored.
uploads_path: "%(uploads_path)s"
# The largest allowed upload size in bytes
max_upload_size: "10M"
# Maximum number of pixels that will be thumbnailed
max_image_pixels: "32M"
# Whether to generate new thumbnails on the fly to precisely match
# the resolution requested by the client. If true then whenever
# a new resolution is requested by the client the server will
# generate a new thumbnail. If false the server will pick a thumbnail
# from a precalculated list.
dynamic_thumbnails: false
# List of thumbnail to precalculate when an image is uploaded.
thumbnail_sizes:
- width: 32
height: 32
method: crop
- width: 96
height: 96
method: crop
- width: 320
height: 240
method: scale
- width: 640
height: 480
method: scale
- width: 800
height: 600
method: scale
# Is the preview URL API enabled? If enabled, you *must* specify
# an explicit url_preview_ip_range_blacklist of IPs that the spider is
# denied from accessing.
url_preview_enabled: False
# List of IP address CIDR ranges that the URL preview spider is denied
# from accessing. There are no defaults: you must explicitly
# specify a list for URL previewing to work. You should specify any
# internal services in your network that you do not want synapse to try
# to connect to, otherwise anyone in any Matrix room could cause your
# synapse to issue arbitrary GET requests to your internal services,
# causing serious security issues.
#
# url_preview_ip_range_blacklist:
# - '127.0.0.0/8'
# - '10.0.0.0/8'
# - '172.16.0.0/12'
# - '192.168.0.0/16'
# Optional list of URL matches that the URL preview spider is
# denied from accessing. You should use url_preview_ip_range_blacklist
# in preference to this, otherwise someone could define a public DNS
# entry that points to a private IP address and circumvent the blacklist.
# This is more useful if you know there is an entire shape of URL that
# you know that will never want synapse to try to spider.
#
# Each list entry is a dictionary of url component attributes as returned
# by urlparse.urlsplit as applied to the absolute form of the URL. See
# https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit
# The values of the dictionary are treated as an filename match pattern
# applied to that component of URLs, unless they start with a ^ in which
# case they are treated as a regular expression match. If all the
# specified component matches for a given list item succeed, the URL is
# blacklisted.
#
# url_preview_url_blacklist:
# # blacklist any URL with a username in its URI
# - username: '*'
#
# # blacklist all *.google.com URLs
# - netloc: 'google.com'
# - netloc: '*.google.com'
#
# # blacklist all plain HTTP URLs
# - scheme: 'http'
#
# # blacklist http(s)://www.acme.com/foo
# - netloc: 'www.acme.com'
# path: '/foo'
#
# # blacklist any URL with a literal IPv4 address
# - netloc: '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$'
# The largest allowed URL preview spidering size in bytes
max_spider_size: "10M"
""" % locals()
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