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synapse/tests/rest/media/v1/test_url_preview.py
Patrick Cloke 682151a464
Do not fail completely if oEmbed autodiscovery fails. (#15092) 
Previously if an autodiscovered oEmbed request failed (e.g. the
oEmbed endpoint is down or does not exist) then the entire URL
preview would fail. Instead we now return everything we can, even
if this additional request fails.
2023-02-23 16:08:53 -05:00

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Python
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# Copyright 2018 New Vector Ltd
# 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.
import base64
import json
import os
import re
from typing import Any, Dict, Optional, Sequence, Tuple, Type
from urllib.parse import quote, urlencode
from twisted.internet._resolver import HostResolution
from twisted.internet.address import IPv4Address, IPv6Address
from twisted.internet.error import DNSLookupError
from twisted.internet.interfaces import IAddress, IResolutionReceiver
from twisted.test.proto_helpers import AccumulatingProtocol, MemoryReactor
from synapse.config.oembed import OEmbedEndpointConfig
from synapse.rest.media.v1.media_repository import MediaRepositoryResource
from synapse.rest.media.v1.preview_url_resource import IMAGE_CACHE_EXPIRY_MS
from synapse.server import HomeServer
from synapse.types import JsonDict
from synapse.util import Clock
from synapse.util.stringutils import parse_and_validate_mxc_uri
from tests import unittest
from tests.server import FakeTransport
from tests.test_utils import SMALL_PNG
from tests.utils import MockClock
try:
import lxml
except ImportError:
lxml = None
class URLPreviewTests(unittest.HomeserverTestCase):
if not lxml:
skip = "url preview feature requires lxml"
hijack_auth = True
user_id = "@test:user"
end_content = (
b"<html><head>"
b'<meta property="og:title" content="~matrix~" />'
b'<meta property="og:description" content="hi" />'
b"</head></html>"
)
def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
config = self.default_config()
config["url_preview_enabled"] = True
config["max_spider_size"] = 9999999
config["url_preview_ip_range_blacklist"] = (
"192.168.1.1",
"1.0.0.0/8",
"3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
"2001:800::/21",
)
config["url_preview_ip_range_whitelist"] = ("1.1.1.1",)
config["url_preview_accept_language"] = [
"en-UK",
"en-US;q=0.9",
"fr;q=0.8",
"*;q=0.7",
]
self.storage_path = self.mktemp()
self.media_store_path = self.mktemp()
os.mkdir(self.storage_path)
os.mkdir(self.media_store_path)
config["media_store_path"] = self.media_store_path
provider_config = {
"module": "synapse.rest.media.v1.storage_provider.FileStorageProviderBackend",
"store_local": True,
"store_synchronous": False,
"store_remote": True,
"config": {"directory": self.storage_path},
}
config["media_storage_providers"] = [provider_config]
hs = self.setup_test_homeserver(config=config)
# After the hs is created, modify the parsed oEmbed config (to avoid
# messing with files).
#
# Note that HTTP URLs are used to avoid having to deal with TLS in tests.
hs.config.oembed.oembed_patterns = [
OEmbedEndpointConfig(
api_endpoint="http://publish.twitter.com/oembed",
url_patterns=[
re.compile(r"http://twitter\.com/.+/status/.+"),
],
formats=None,
),
OEmbedEndpointConfig(
api_endpoint="http://www.hulu.com/api/oembed.{format}",
url_patterns=[
re.compile(r"http://www\.hulu\.com/watch/.+"),
],
formats=["json"],
),
]
return hs
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
self.media_repo = hs.get_media_repository_resource()
self.preview_url = self.media_repo.children[b"preview_url"]
self.lookups: Dict[str, Any] = {}
class Resolver:
def resolveHostName(
_self,
resolutionReceiver: IResolutionReceiver,
hostName: str,
portNumber: int = 0,
addressTypes: Optional[Sequence[Type[IAddress]]] = None,
transportSemantics: str = "TCP",
) -> IResolutionReceiver:
resolution = HostResolution(hostName)
resolutionReceiver.resolutionBegan(resolution)
if hostName not in self.lookups:
raise DNSLookupError("OH NO")
for i in self.lookups[hostName]:
resolutionReceiver.addressResolved(i[0]("TCP", i[1], portNumber))
resolutionReceiver.resolutionComplete()
return resolutionReceiver
self.reactor.nameResolver = Resolver() # type: ignore[assignment]
def create_test_resource(self) -> MediaRepositoryResource:
return self.hs.get_media_repository_resource()
def _assert_small_png(self, json_body: JsonDict) -> None:
"""Assert properties from the SMALL_PNG test image."""
self.assertTrue(json_body["og:image"].startswith("mxc://"))
self.assertEqual(json_body["og:image:height"], 1)
self.assertEqual(json_body["og:image:width"], 1)
self.assertEqual(json_body["og:image:type"], "image/png")
self.assertEqual(json_body["matrix:image:size"], 67)
def test_cache_returns_correct_type(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
# Check the cache returns the correct response
channel = self.make_request(
"GET", "preview_url?url=http://matrix.org", shorthand=False
)
# Check the cache response has the same content
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
# Clear the in-memory cache
self.assertIn("http://matrix.org", self.preview_url._cache)
self.preview_url._cache.pop("http://matrix.org")
self.assertNotIn("http://matrix.org", self.preview_url._cache)
# Check the database cache returns the correct response
channel = self.make_request(
"GET", "preview_url?url=http://matrix.org", shorthand=False
)
# Check the cache response has the same content
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
def test_non_ascii_preview_httpequiv(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = (
b"<html><head>"
b'<meta http-equiv="Content-Type" content="text/html; charset=windows-1251"/>'
b'<meta property="og:title" content="\xe4\xea\xe0" />'
b'<meta property="og:description" content="hi" />'
b"</head></html>"
)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(channel.json_body["og:title"], "\u0434\u043a\u0430")
def test_video_rejected(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = b"anything"
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: video/mp4\r\n\r\n"
)
% (len(end_content))
+ end_content
)
self.pump()
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "Requested file's content type not allowed for this operation: video/mp4",
},
)
def test_audio_rejected(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = b"anything"
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: audio/aac\r\n\r\n"
)
% (len(end_content))
+ end_content
)
self.pump()
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "Requested file's content type not allowed for this operation: audio/aac",
},
)
def test_non_ascii_preview_content_type(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = (
b"<html><head>"
b'<meta property="og:title" content="\xe4\xea\xe0" />'
b'<meta property="og:description" content="hi" />'
b"</head></html>"
)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="windows-1251"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(channel.json_body["og:title"], "\u0434\u043a\u0430")
def test_overlong_title(self) -> None:
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = (
b"<html><head>"
b"<title>" + b"x" * 2000 + b"</title>"
b'<meta property="og:description" content="hi" />'
b"</head></html>"
)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="windows-1251"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
res = channel.json_body
# We should only see the `og:description` field, as `title` is too long and should be stripped out
self.assertCountEqual(["og:description"], res.keys())
def test_ipaddr(self) -> None:
"""
IP addresses can be previewed directly.
"""
self.lookups["example.com"] = [(IPv4Address, "10.1.2.3")]
channel = self.make_request(
"GET",
"preview_url?url=http://example.com",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
def test_blacklisted_ip_specific(self) -> None:
"""
Blacklisted IP addresses, found via DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "192.168.1.1")]
channel = self.make_request(
"GET", "preview_url?url=http://example.com", shorthand=False
)
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "DNS resolution failure during URL preview generation",
},
)
def test_blacklisted_ip_range(self) -> None:
"""
Blacklisted IP ranges, IPs found over DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "1.1.1.2")]
channel = self.make_request(
"GET", "preview_url?url=http://example.com", shorthand=False
)
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "DNS resolution failure during URL preview generation",
},
)
def test_blacklisted_ip_specific_direct(self) -> None:
"""
Blacklisted IP addresses, accessed directly, are not spidered.
"""
channel = self.make_request(
"GET", "preview_url?url=http://192.168.1.1", shorthand=False
)
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "IP address blocked by IP blacklist entry",
},
)
self.assertEqual(channel.code, 403)
def test_blacklisted_ip_range_direct(self) -> None:
"""
Blacklisted IP ranges, accessed directly, are not spidered.
"""
channel = self.make_request(
"GET", "preview_url?url=http://1.1.1.2", shorthand=False
)
self.assertEqual(channel.code, 403)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "IP address blocked by IP blacklist entry",
},
)
def test_blacklisted_ip_range_whitelisted_ip(self) -> None:
"""
Blacklisted but then subsequently whitelisted IP addresses can be
spidered.
"""
self.lookups["example.com"] = [(IPv4Address, "1.1.1.1")]
channel = self.make_request(
"GET",
"preview_url?url=http://example.com",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
def test_blacklisted_ip_with_external_ip(self) -> None:
"""
If a hostname resolves a blacklisted IP, even if there's a
non-blacklisted one, it will be rejected.
"""
# Hardcode the URL resolving to the IP we want.
self.lookups["example.com"] = [
(IPv4Address, "1.1.1.2"),
(IPv4Address, "10.1.2.3"),
]
channel = self.make_request(
"GET", "preview_url?url=http://example.com", shorthand=False
)
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "DNS resolution failure during URL preview generation",
},
)
def test_blacklisted_ipv6_specific(self) -> None:
"""
Blacklisted IP addresses, found via DNS, are not spidered.
"""
self.lookups["example.com"] = [
(IPv6Address, "3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
]
channel = self.make_request(
"GET", "preview_url?url=http://example.com", shorthand=False
)
# No requests made.
self.assertEqual(len(self.reactor.tcpClients), 0)
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "DNS resolution failure during URL preview generation",
},
)
def test_blacklisted_ipv6_range(self) -> None:
"""
Blacklisted IP ranges, IPs found over DNS, are not spidered.
"""
self.lookups["example.com"] = [(IPv6Address, "2001:800::1")]
channel = self.make_request(
"GET", "preview_url?url=http://example.com", shorthand=False
)
self.assertEqual(channel.code, 502)
self.assertEqual(
channel.json_body,
{
"errcode": "M_UNKNOWN",
"error": "DNS resolution failure during URL preview generation",
},
)
def test_OPTIONS(self) -> None:
"""
OPTIONS returns the OPTIONS.
"""
channel = self.make_request(
"OPTIONS", "preview_url?url=http://example.com", shorthand=False
)
self.assertEqual(channel.code, 200)
self.assertEqual(channel.json_body, {})
def test_accept_language_config_option(self) -> None:
"""
Accept-Language header is sent to the remote server
"""
self.lookups["example.com"] = [(IPv4Address, "10.1.2.3")]
# Build and make a request to the server
channel = self.make_request(
"GET",
"preview_url?url=http://example.com",
shorthand=False,
await_result=False,
)
self.pump()
# Extract Synapse's tcp client
client = self.reactor.tcpClients[0][2].buildProtocol(None)
# Build a fake remote server to reply with
server = AccumulatingProtocol()
# Connect the two together
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
# Tell Synapse that it has received some data from the remote server
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
# Move the reactor along until we get a response on our original channel
self.pump()
self.assertEqual(channel.code, 200)
self.assertEqual(
channel.json_body, {"og:title": "~matrix~", "og:description": "hi"}
)
# Check that the server received the Accept-Language header as part
# of the request from Synapse
self.assertIn(
(
b"Accept-Language: en-UK\r\n"
b"Accept-Language: en-US;q=0.9\r\n"
b"Accept-Language: fr;q=0.8\r\n"
b"Accept-Language: *;q=0.7"
),
server.data,
)
def test_nonexistent_image(self) -> None:
"""If the preview image doesn't exist, ensure some data is returned."""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
result = (
b"""<html><body><img src="http://cdn.matrix.org/foo.jpg"></body></html>"""
)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(result),)
+ result
)
self.pump()
self.assertEqual(channel.code, 200)
# The image should not be in the result.
self.assertNotIn("og:image", channel.json_body)
def test_oembed_failure(self) -> None:
"""If the autodiscovered oEmbed URL fails, ensure some data is returned."""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
result = b"""
<title>oEmbed Autodiscovery Fail</title>
<link rel="alternate" type="application/json+oembed"
href="http://example.com/oembed?url=http%3A%2F%2Fmatrix.org&format=json"
title="matrixdotorg" />
"""
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(result),)
+ result
)
self.pump()
self.assertEqual(channel.code, 200)
# The image should not be in the result.
self.assertEqual(channel.json_body["og:title"], "oEmbed Autodiscovery Fail")
def test_data_url(self) -> None:
"""
Requesting to preview a data URL is not supported.
"""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
data = base64.b64encode(SMALL_PNG).decode()
query_params = urlencode(
{
"url": f'<html><head><img src="data:image/png;base64,{data}" /></head></html>'
}
)
channel = self.make_request(
"GET",
f"preview_url?{query_params}",
shorthand=False,
)
self.pump()
self.assertEqual(channel.code, 500)
def test_inline_data_url(self) -> None:
"""
An inline image (as a data URL) should be parsed properly.
"""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
data = base64.b64encode(SMALL_PNG)
end_content = (
b"<html><head>" b'<img src="data:image/png;base64,%s" />' b"</head></html>"
) % (data,)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
self._assert_small_png(channel.json_body)
def test_oembed_photo(self) -> None:
"""Test an oEmbed endpoint which returns a 'photo' type which redirects the preview to a new URL."""
self.lookups["publish.twitter.com"] = [(IPv4Address, "10.1.2.3")]
self.lookups["cdn.twitter.com"] = [(IPv4Address, "10.1.2.3")]
result = {
"version": "1.0",
"type": "photo",
"url": "http://cdn.twitter.com/matrixdotorg",
}
oembed_content = json.dumps(result).encode("utf-8")
channel = self.make_request(
"GET",
"preview_url?url=http://twitter.com/matrixdotorg/status/12345",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: application/json; charset="utf8"\r\n\r\n'
)
% (len(oembed_content),)
+ oembed_content
)
self.pump()
# Ensure a second request is made to the photo URL.
client = self.reactor.tcpClients[1][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: image/png\r\n\r\n"
)
% (len(SMALL_PNG),)
+ SMALL_PNG
)
self.pump()
# Ensure the URL is what was requested.
self.assertIn(b"/matrixdotorg", server.data)
self.assertEqual(channel.code, 200)
body = channel.json_body
self.assertEqual(body["og:url"], "http://twitter.com/matrixdotorg/status/12345")
self._assert_small_png(body)
def test_oembed_rich(self) -> None:
"""Test an oEmbed endpoint which returns HTML content via the 'rich' type."""
self.lookups["publish.twitter.com"] = [(IPv4Address, "10.1.2.3")]
result = {
"version": "1.0",
"type": "rich",
# Note that this provides the author, not the title.
"author_name": "Alice",
"html": "<div>Content Preview</div>",
}
end_content = json.dumps(result).encode("utf-8")
channel = self.make_request(
"GET",
"preview_url?url=http://twitter.com/matrixdotorg/status/12345",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: application/json; charset="utf8"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
body = channel.json_body
self.assertEqual(
body,
{
"og:url": "http://twitter.com/matrixdotorg/status/12345",
"og:title": "Alice",
"og:description": "Content Preview",
},
)
def test_oembed_format(self) -> None:
"""Test an oEmbed endpoint which requires the format in the URL."""
self.lookups["www.hulu.com"] = [(IPv4Address, "10.1.2.3")]
result = {
"version": "1.0",
"type": "rich",
"html": "<div>Content Preview</div>",
}
end_content = json.dumps(result).encode("utf-8")
channel = self.make_request(
"GET",
"preview_url?url=http://www.hulu.com/watch/12345",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: application/json; charset="utf8"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
# The {format} should have been turned into json.
self.assertIn(b"/api/oembed.json", server.data)
# A URL parameter of format=json should be provided.
self.assertIn(b"format=json", server.data)
self.assertEqual(channel.code, 200)
body = channel.json_body
self.assertEqual(
body,
{
"og:url": "http://www.hulu.com/watch/12345",
"og:description": "Content Preview",
},
)
def test_oembed_autodiscovery(self) -> None:
"""
Autodiscovery works by finding the link in the HTML response and then requesting an oEmbed URL.
1. Request a preview of a URL which is not known to the oEmbed code.
2. It returns HTML including a link to an oEmbed preview.
3. The oEmbed preview is requested and returns a URL for an image.
4. The image is requested for thumbnailing.
"""
# This is a little cheesy in that we use the www subdomain (which isn't the
# list of oEmbed patterns) to get "raw" HTML response.
self.lookups["www.twitter.com"] = [(IPv4Address, "10.1.2.3")]
self.lookups["publish.twitter.com"] = [(IPv4Address, "10.1.2.3")]
self.lookups["cdn.twitter.com"] = [(IPv4Address, "10.1.2.3")]
result = b"""
<link rel="alternate" type="application/json+oembed"
href="http://publish.twitter.com/oembed?url=http%3A%2F%2Fcdn.twitter.com%2Fmatrixdotorg%2Fstatus%2F12345&format=json"
title="matrixdotorg" />
"""
channel = self.make_request(
"GET",
"preview_url?url=http://www.twitter.com/matrixdotorg/status/12345",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(result),)
+ result
)
self.pump()
# The oEmbed response.
result2 = {
"version": "1.0",
"type": "photo",
"url": "http://cdn.twitter.com/matrixdotorg",
}
oembed_content = json.dumps(result2).encode("utf-8")
# Ensure a second request is made to the oEmbed URL.
client = self.reactor.tcpClients[1][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: application/json; charset="utf8"\r\n\r\n'
)
% (len(oembed_content),)
+ oembed_content
)
self.pump()
# Ensure the URL is what was requested.
self.assertIn(b"/oembed?", server.data)
# Ensure a third request is made to the photo URL.
client = self.reactor.tcpClients[2][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b"Content-Type: image/png\r\n\r\n"
)
% (len(SMALL_PNG),)
+ SMALL_PNG
)
self.pump()
# Ensure the URL is what was requested.
self.assertIn(b"/matrixdotorg", server.data)
self.assertEqual(channel.code, 200)
body = channel.json_body
self.assertEqual(
body["og:url"], "http://www.twitter.com/matrixdotorg/status/12345"
)
self._assert_small_png(body)
def _download_image(self) -> Tuple[str, str]:
"""Downloads an image into the URL cache.
Returns:
A (host, media_id) tuple representing the MXC URI of the image.
"""
self.lookups["cdn.twitter.com"] = [(IPv4Address, "10.1.2.3")]
channel = self.make_request(
"GET",
"preview_url?url=http://cdn.twitter.com/matrixdotorg",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: image/png\r\n\r\n"
% (len(SMALL_PNG),)
+ SMALL_PNG
)
self.pump()
self.assertEqual(channel.code, 200)
body = channel.json_body
mxc_uri = body["og:image"]
host, _port, media_id = parse_and_validate_mxc_uri(mxc_uri)
self.assertIsNone(_port)
return host, media_id
def test_storage_providers_exclude_files(self) -> None:
"""Test that files are not stored in or fetched from storage providers."""
host, media_id = self._download_image()
rel_file_path = self.preview_url.filepaths.url_cache_filepath_rel(media_id)
media_store_path = os.path.join(self.media_store_path, rel_file_path)
storage_provider_path = os.path.join(self.storage_path, rel_file_path)
# Check storage
self.assertTrue(os.path.isfile(media_store_path))
self.assertFalse(
os.path.isfile(storage_provider_path),
"URL cache file was unexpectedly stored in a storage provider",
)
# Check fetching
channel = self.make_request(
"GET",
f"download/{host}/{media_id}",
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(channel.code, 200)
# Move cached file into the storage provider
os.makedirs(os.path.dirname(storage_provider_path), exist_ok=True)
os.rename(media_store_path, storage_provider_path)
channel = self.make_request(
"GET",
f"download/{host}/{media_id}",
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(
channel.code,
404,
"URL cache file was unexpectedly retrieved from a storage provider",
)
def test_storage_providers_exclude_thumbnails(self) -> None:
"""Test that thumbnails are not stored in or fetched from storage providers."""
host, media_id = self._download_image()
rel_thumbnail_path = (
self.preview_url.filepaths.url_cache_thumbnail_directory_rel(media_id)
)
media_store_thumbnail_path = os.path.join(
self.media_store_path, rel_thumbnail_path
)
storage_provider_thumbnail_path = os.path.join(
self.storage_path, rel_thumbnail_path
)
# Check storage
self.assertTrue(os.path.isdir(media_store_thumbnail_path))
self.assertFalse(
os.path.isdir(storage_provider_thumbnail_path),
"URL cache thumbnails were unexpectedly stored in a storage provider",
)
# Check fetching
channel = self.make_request(
"GET",
f"thumbnail/{host}/{media_id}?width=32&height=32&method=scale",
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(channel.code, 200)
# Remove the original, otherwise thumbnails will regenerate
rel_file_path = self.preview_url.filepaths.url_cache_filepath_rel(media_id)
media_store_path = os.path.join(self.media_store_path, rel_file_path)
os.remove(media_store_path)
# Move cached thumbnails into the storage provider
os.makedirs(os.path.dirname(storage_provider_thumbnail_path), exist_ok=True)
os.rename(media_store_thumbnail_path, storage_provider_thumbnail_path)
channel = self.make_request(
"GET",
f"thumbnail/{host}/{media_id}?width=32&height=32&method=scale",
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(
channel.code,
404,
"URL cache thumbnail was unexpectedly retrieved from a storage provider",
)
def test_cache_expiry(self) -> None:
"""Test that URL cache files and thumbnails are cleaned up properly on expiry."""
self.preview_url.clock = MockClock()
_host, media_id = self._download_image()
file_path = self.preview_url.filepaths.url_cache_filepath(media_id)
file_dirs = self.preview_url.filepaths.url_cache_filepath_dirs_to_delete(
media_id
)
thumbnail_dir = self.preview_url.filepaths.url_cache_thumbnail_directory(
media_id
)
thumbnail_dirs = self.preview_url.filepaths.url_cache_thumbnail_dirs_to_delete(
media_id
)
self.assertTrue(os.path.isfile(file_path))
self.assertTrue(os.path.isdir(thumbnail_dir))
self.preview_url.clock.advance_time_msec(IMAGE_CACHE_EXPIRY_MS + 1)
self.get_success(self.preview_url._expire_url_cache_data())
for path in [file_path] + file_dirs + [thumbnail_dir] + thumbnail_dirs:
self.assertFalse(
os.path.exists(path),
f"{os.path.relpath(path, self.media_store_path)} was not deleted",
)
@unittest.override_config({"url_preview_url_blacklist": [{"port": "*"}]})
def test_blacklist_port(self) -> None:
"""Tests that blacklisting URLs with a port makes previewing such URLs
fail with a 403 error and doesn't impact other previews.
"""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
bad_url = quote("http://matrix.org:8888/foo")
good_url = quote("http://matrix.org/foo")
channel = self.make_request(
"GET",
"preview_url?url=" + bad_url,
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(channel.code, 403, channel.result)
channel = self.make_request(
"GET",
"preview_url?url=" + good_url,
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\nContent-Type: text/html\r\n\r\n"
% (len(self.end_content),)
+ self.end_content
)
self.pump()
self.assertEqual(channel.code, 200)
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