# -*- 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. Install by running: pip install lxml Requires libxslt1-dev system package. """ ) 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( "For security, you must specify an explicit target IP address " "blacklist in url_preview_ip_range_blacklist for url previewing " "to work" ) if "url_preview_ip_range_whitelist" in config: self.url_preview_ip_range_whitelist = IPSet( config["url_preview_ip_range_whitelist"] ) 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' # # List of IP address CIDR ranges that the URL preview spider is allowed # to access even if they are specified in url_preview_ip_range_blacklist. # This is useful for specifying exceptions to wide-ranging blacklisted # target IP ranges - e.g. for enabling URL previews for a specific private # website only visible in your network. # # url_preview_ip_range_whitelist: # - '192.168.1.1' # 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()