diff options
Diffstat (limited to 'synapse/rest')
| -rw-r--r-- | synapse/rest/media/v1/preview_url_resource.py | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py index ba3ab1d37d..acf87709f2 100644 --- a/synapse/rest/media/v1/preview_url_resource.py +++ b/synapse/rest/media/v1/preview_url_resource.py @@ -31,6 +31,7 @@ from six.moves import urllib_parse as urlparse from canonicaljson import json from twisted.internet import defer +from twisted.internet.error import DNSLookupError from twisted.web.resource import Resource from twisted.web.server import NOT_DONE_YET @@ -328,9 +329,18 @@ class PreviewUrlResource(Resource): # handler will return a SynapseError to the client instead of # blank data or a 500. raise + except DNSLookupError: + # DNS lookup returned no results + # Note: This will also be the case if one of the resolved IP + # addresses is blacklisted + raise SynapseError( + 502, "DNS resolution failure during URL preview generation", + Codes.UNKNOWN + ) except Exception as e: # FIXME: pass through 404s and other error messages nicely logger.warn("Error downloading %s: %r", url, e) + raise SynapseError( 500, "Failed to download content: %s" % ( traceback.format_exception_only(sys.exc_info()[0], e), |