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Reject device display names that are too long (#6882)
* Reject device display names that are too long. Too long is currently defined as 100 characters in length. * Add a regression test for rejecting a too long device display name.
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changelog.d/6882.misc
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1
changelog.d/6882.misc
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@ -0,0 +1 @@
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Reject device display names over 100 characters in length.
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@ -26,6 +26,7 @@ from synapse.api.errors import (
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FederationDeniedError,
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HttpResponseException,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.logging.opentracing import log_kv, set_tag, trace
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from synapse.types import RoomStreamToken, get_domain_from_id
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@ -39,6 +40,8 @@ from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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MAX_DEVICE_DISPLAY_NAME_LEN = 100
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class DeviceWorkerHandler(BaseHandler):
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def __init__(self, hs):
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@ -404,9 +407,18 @@ class DeviceHandler(DeviceWorkerHandler):
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defer.Deferred:
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"""
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# Reject a new displayname which is too long.
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new_display_name = content.get("display_name")
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if new_display_name and len(new_display_name) > MAX_DEVICE_DISPLAY_NAME_LEN:
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raise SynapseError(
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400,
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"Device display name is too long (max %i)"
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% (MAX_DEVICE_DISPLAY_NAME_LEN,),
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)
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try:
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yield self.store.update_device(
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user_id, device_id, new_display_name=content.get("display_name")
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user_id, device_id, new_display_name=new_display_name
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)
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yield self.notify_device_update(user_id, [device_id])
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except errors.StoreError as e:
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@ -160,6 +160,24 @@ class DeviceTestCase(unittest.HomeserverTestCase):
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res = self.get_success(self.handler.get_device(user1, "abc"))
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self.assertEqual(res["display_name"], "new display")
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def test_update_device_too_long_display_name(self):
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"""Update a device with a display name that is invalid (too long)."""
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self._record_users()
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# Request to update a device display name with a new value that is longer than allowed.
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update = {
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"display_name": "a"
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* (synapse.handlers.device.MAX_DEVICE_DISPLAY_NAME_LEN + 1)
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}
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self.get_failure(
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self.handler.update_device(user1, "abc", update),
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synapse.api.errors.SynapseError,
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)
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# Ensure the display name was not updated.
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res = self.get_success(self.handler.get_device(user1, "abc"))
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self.assertEqual(res["display_name"], "display 2")
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def test_update_unknown_device(self):
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update = {"display_name": "new_display"}
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res = self.handler.update_device("user_id", "unknown_device_id", update)
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