Implement RedirectException (#6687)

Allow REST endpoint implemnentations to raise a RedirectException, which will
redirect the user's browser to a given location.
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Richard van der Hoff 2020-01-15 15:58:55 +00:00 committed by GitHub
parent 28c98e51ff
commit 8f5d7302ac
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4 changed files with 113 additions and 7 deletions

1
changelog.d/6687.misc Normal file
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@ -0,0 +1 @@
Allow REST endpoint implementations to raise a RedirectException, which will redirect the user's browser to a given location.

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@ -17,13 +17,15 @@
"""Contains exceptions and error codes."""
import logging
from typing import Dict
from typing import Dict, List
from six import iteritems
from six.moves import http_client
from canonicaljson import json
from twisted.web import http
logger = logging.getLogger(__name__)
@ -80,6 +82,29 @@ class CodeMessageException(RuntimeError):
self.msg = msg
class RedirectException(CodeMessageException):
"""A pseudo-error indicating that we want to redirect the client to a different
location
Attributes:
cookies: a list of set-cookies values to add to the response. For example:
b"sessionId=a3fWa; Expires=Wed, 21 Oct 2015 07:28:00 GMT"
"""
def __init__(self, location: bytes, http_code: int = http.FOUND):
"""
Args:
location: the URI to redirect to
http_code: the HTTP response code
"""
msg = "Redirect to %s" % (location.decode("utf-8"),)
super().__init__(code=http_code, msg=msg)
self.location = location
self.cookies = [] # type: List[bytes]
class SynapseError(CodeMessageException):
"""A base exception type for matrix errors which have an errcode and error
message (as well as an HTTP status code).

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@ -14,8 +14,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import cgi
import collections
import html
import http.client
import logging
import types
@ -36,6 +36,7 @@ import synapse.metrics
from synapse.api.errors import (
CodeMessageException,
Codes,
RedirectException,
SynapseError,
UnrecognizedRequestError,
)
@ -153,14 +154,18 @@ def _return_html_error(f, request):
Args:
f (twisted.python.failure.Failure):
request (twisted.web.iweb.IRequest):
request (twisted.web.server.Request):
"""
if f.check(CodeMessageException):
cme = f.value
code = cme.code
msg = cme.msg
if isinstance(cme, SynapseError):
if isinstance(cme, RedirectException):
logger.info("%s redirect to %s", request, cme.location)
request.setHeader(b"location", cme.location)
request.cookies.extend(cme.cookies)
elif isinstance(cme, SynapseError):
logger.info("%s SynapseError: %s - %s", request, code, msg)
else:
logger.error(
@ -178,7 +183,7 @@ def _return_html_error(f, request):
exc_info=(f.type, f.value, f.getTracebackObject()),
)
body = HTML_ERROR_TEMPLATE.format(code=code, msg=cgi.escape(msg)).encode("utf-8")
body = HTML_ERROR_TEMPLATE.format(code=code, msg=html.escape(msg)).encode("utf-8")
request.setResponseCode(code)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%i" % (len(body),))

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@ -23,8 +23,12 @@ from twisted.test.proto_helpers import AccumulatingProtocol
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.api.errors import Codes, SynapseError
from synapse.http.server import JsonResource
from synapse.api.errors import Codes, RedirectException, SynapseError
from synapse.http.server import (
DirectServeResource,
JsonResource,
wrap_html_request_handler,
)
from synapse.http.site import SynapseSite, logger
from synapse.logging.context import make_deferred_yieldable
from synapse.util import Clock
@ -164,6 +168,77 @@ class JsonResourceTests(unittest.TestCase):
self.assertEqual(channel.json_body["errcode"], "M_UNRECOGNIZED")
class WrapHtmlRequestHandlerTests(unittest.TestCase):
class TestResource(DirectServeResource):
callback = None
@wrap_html_request_handler
async def _async_render_GET(self, request):
return await self.callback(request)
def setUp(self):
self.reactor = ThreadedMemoryReactorClock()
def test_good_response(self):
def callback(request):
request.write(b"response")
request.finish()
res = WrapHtmlRequestHandlerTests.TestResource()
res.callback = callback
request, channel = make_request(self.reactor, b"GET", b"/path")
render(request, res, self.reactor)
self.assertEqual(channel.result["code"], b"200")
body = channel.result["body"]
self.assertEqual(body, b"response")
def test_redirect_exception(self):
"""
If the callback raises a RedirectException, it is turned into a 30x
with the right location.
"""
def callback(request, **kwargs):
raise RedirectException(b"/look/an/eagle", 301)
res = WrapHtmlRequestHandlerTests.TestResource()
res.callback = callback
request, channel = make_request(self.reactor, b"GET", b"/path")
render(request, res, self.reactor)
self.assertEqual(channel.result["code"], b"301")
headers = channel.result["headers"]
location_headers = [v for k, v in headers if k == b"Location"]
self.assertEqual(location_headers, [b"/look/an/eagle"])
def test_redirect_exception_with_cookie(self):
"""
If the callback raises a RedirectException which sets a cookie, that is
returned too
"""
def callback(request, **kwargs):
e = RedirectException(b"/no/over/there", 304)
e.cookies.append(b"session=yespls")
raise e
res = WrapHtmlRequestHandlerTests.TestResource()
res.callback = callback
request, channel = make_request(self.reactor, b"GET", b"/path")
render(request, res, self.reactor)
self.assertEqual(channel.result["code"], b"304")
headers = channel.result["headers"]
location_headers = [v for k, v in headers if k == b"Location"]
self.assertEqual(location_headers, [b"/no/over/there"])
cookies_headers = [v for k, v in headers if k == b"Set-Cookie"]
self.assertEqual(cookies_headers, [b"session=yespls"])
class SiteTestCase(unittest.HomeserverTestCase):
def test_lose_connection(self):
"""