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forked-synapse/synapse/config/repository.py
David Robertson 313581e4e9
Use importlib.metadata to read requirements (#12088) 
* Pull runtime dep checks into their own module
* Reimplement `check_requirements` using `importlib`

I've tried to make this clearer. We start by working out which of
Synapse's requirements we need to be installed here and now. I was
surprised that there wasn't an easier way to see which packages were
installed by a given extra.

I've pulled out the error messages into functions that deal with "is
this for an extra or not". And I've rearranged the loop over two
different sets of requirements into one loop with a "must be instaled"
flag.

I hope you agree that this is clearer.

* Test cases
2022-03-01 17:44:41 +00:00

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# Copyright 2014, 2015 OpenMarket Ltd
#
# 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.
import logging
import os
from typing import Dict, List, Tuple
from urllib.request import getproxies_environment # type: ignore
import attr
from synapse.config.server import DEFAULT_IP_RANGE_BLACKLIST, generate_ip_set
from synapse.types import JsonDict
from synapse.util.check_dependencies import DependencyException, check_requirements
from synapse.util.module_loader import load_module
from ._base import Config, ConfigError
logger = logging.getLogger(__name__)
DEFAULT_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"},
]
THUMBNAIL_SIZE_YAML = """\
# - width: %(width)i
# height: %(height)i
# method: %(method)s
"""
HTTP_PROXY_SET_WARNING = """\
The Synapse config url_preview_ip_range_blacklist will be ignored as an HTTP(s) proxy is configured."""
@attr.s(frozen=True, slots=True, auto_attribs=True)
class ThumbnailRequirement:
width: int
height: int
method: str
media_type: str
@attr.s(frozen=True, slots=True, auto_attribs=True)
class MediaStorageProviderConfig:
store_local: bool # Whether to store newly uploaded local files
store_remote: bool # Whether to store newly downloaded remote files
store_synchronous: bool # Whether to wait for successful storage for local uploads
def parse_thumbnail_requirements(
thumbnail_sizes: List[JsonDict],
) -> Dict[str, Tuple[ThumbnailRequirement, ...]]:
"""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 of dicts with "width", "height", and "method" keys
Returns:
Dictionary mapping from media type string to list of ThumbnailRequirement.
"""
requirements: Dict[str, List[ThumbnailRequirement]] = {}
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/jpg", []).append(jpeg_thumbnail)
requirements.setdefault("image/webp", []).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):
section = "media"
def read_config(self, config, **kwargs):
# Only enable the media repo if either the media repo is enabled or the
# current worker app is the media repo.
if (
self.root.server.enable_media_repo is False
and config.get("worker_app") != "synapse.app.media_repository"
):
self.can_load_media_repo = False
return
else:
self.can_load_media_repo = True
# Whether this instance should be the one to run the background jobs to
# e.g clean up old URL previews.
self.media_instance_running_background_jobs = config.get(
"media_instance_running_background_jobs",
)
self.max_upload_size = self.parse_size(config.get("max_upload_size", "50M"))
self.max_image_pixels = self.parse_size(config.get("max_image_pixels", "32M"))
self.max_spider_size = self.parse_size(config.get("max_spider_size", "10M"))
self.media_store_path = self.ensure_directory(
config.get("media_store_path", "media_store")
)
backup_media_store_path = config.get("backup_media_store_path")
synchronous_backup_media_store = config.get(
"synchronous_backup_media_store", False
)
storage_providers = config.get("media_storage_providers", [])
if backup_media_store_path:
if storage_providers:
raise ConfigError(
"Cannot use both 'backup_media_store_path' and 'storage_providers'"
)
storage_providers = [
{
"module": "file_system",
"store_local": True,
"store_synchronous": synchronous_backup_media_store,
"store_remote": True,
"config": {"directory": backup_media_store_path},
}
]
# This is a list of config that can be used to create the storage
# providers. The entries are tuples of (Class, class_config,
# MediaStorageProviderConfig), where Class is the class of the provider,
# the class_config the config to pass to it, and
# MediaStorageProviderConfig are options for StorageProviderWrapper.
#
# We don't create the storage providers here as not all workers need
# them to be started.
self.media_storage_providers: List[tuple] = []
for i, provider_config in enumerate(storage_providers):
# We special case the module "file_system" so as not to need to
# expose FileStorageProviderBackend
if provider_config["module"] == "file_system":
provider_config["module"] = (
"synapse.rest.media.v1.storage_provider"
".FileStorageProviderBackend"
)
provider_class, parsed_config = load_module(
provider_config, ("media_storage_providers", "<item %i>" % i)
)
wrapper_config = MediaStorageProviderConfig(
provider_config.get("store_local", False),
provider_config.get("store_remote", False),
provider_config.get("store_synchronous", False),
)
self.media_storage_providers.append(
(provider_class, parsed_config, wrapper_config)
)
self.dynamic_thumbnails = config.get("dynamic_thumbnails", False)
self.thumbnail_requirements = parse_thumbnail_requirements(
config.get("thumbnail_sizes", DEFAULT_THUMBNAIL_SIZES)
)
self.url_preview_enabled = config.get("url_preview_enabled", False)
if self.url_preview_enabled:
try:
check_requirements("url_preview")
except DependencyException as e:
raise ConfigError(
e.message # noqa: B306, DependencyException.message is a property
)
proxy_env = getproxies_environment()
if "url_preview_ip_range_blacklist" not in config:
if "http" not in proxy_env or "https" not in proxy_env:
raise ConfigError(
"For security, you must specify an explicit target IP address "
"blacklist in url_preview_ip_range_blacklist for url previewing "
"to work"
)
else:
if "http" in proxy_env or "https" in proxy_env:
logger.warning("".join(HTTP_PROXY_SET_WARNING))
# we always blacklist '0.0.0.0' and '::', which are supposed to be
# unroutable addresses.
self.url_preview_ip_range_blacklist = generate_ip_set(
config["url_preview_ip_range_blacklist"],
["0.0.0.0", "::"],
config_path=("url_preview_ip_range_blacklist",),
)
self.url_preview_ip_range_whitelist = generate_ip_set(
config.get("url_preview_ip_range_whitelist", ()),
config_path=("url_preview_ip_range_whitelist",),
)
self.url_preview_url_blacklist = config.get("url_preview_url_blacklist", ())
self.url_preview_accept_language = config.get(
"url_preview_accept_language"
) or ["en"]
def generate_config_section(self, data_dir_path, **kwargs):
media_store = os.path.join(data_dir_path, "media_store")
formatted_thumbnail_sizes = "".join(
THUMBNAIL_SIZE_YAML % s for s in DEFAULT_THUMBNAIL_SIZES
)
# strip final NL
formatted_thumbnail_sizes = formatted_thumbnail_sizes[:-1]
ip_range_blacklist = "\n".join(
" # - '%s'" % ip for ip in DEFAULT_IP_RANGE_BLACKLIST
)
return (
r"""
## Media Store ##
# Enable the media store service in the Synapse master. Uncomment the
# following if you are using a separate media store worker.
#
#enable_media_repo: false
# Directory where uploaded images and attachments are stored.
#
media_store_path: "%(media_store)s"
# Media storage providers allow media to be stored in different
# locations.
#
#media_storage_providers:
# - module: file_system
# # Whether to store newly uploaded local files
# store_local: false
# # Whether to store newly downloaded remote files
# store_remote: false
# # Whether to wait for successful storage for local uploads
# store_synchronous: false
# config:
# directory: /mnt/some/other/directory
# The largest allowed upload size in bytes
#
# If you are using a reverse proxy you may also need to set this value in
# your reverse proxy's config. Notably Nginx has a small max body size by default.
# See https://matrix-org.github.io/synapse/latest/reverse_proxy.html.
#
#max_upload_size: 50M
# 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 thumbnails to precalculate when an image is uploaded.
#
#thumbnail_sizes:
%(formatted_thumbnail_sizes)s
# Is the preview URL API enabled?
#
# 'false' by default: uncomment the following to enable it (and specify a
# url_preview_ip_range_blacklist blacklist).
#
#url_preview_enabled: true
# 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.
#
# (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
# listed here, since they correspond to unroutable addresses.)
#
# This must be specified if url_preview_enabled is set. It is recommended that
# you uncomment the following list as a starting point.
#
# Note: The value is ignored when an HTTP proxy is in use
#
#url_preview_ip_range_blacklist:
%(ip_range_blacklist)s
# 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
# A list of values for the Accept-Language HTTP header used when
# downloading webpages during URL preview generation. This allows
# Synapse to specify the preferred languages that URL previews should
# be in when communicating with remote servers.
#
# Each value is a IETF language tag; a 2-3 letter identifier for a
# language, optionally followed by subtags separated by '-', specifying
# a country or region variant.
#
# Multiple values can be provided, and a weight can be added to each by
# using quality value syntax (;q=). '*' translates to any language.
#
# Defaults to "en".
#
# Example:
#
# url_preview_accept_language:
# - en-UK
# - en-US;q=0.9
# - fr;q=0.8
# - *;q=0.7
#
url_preview_accept_language:
# - en
"""
% locals()
)
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