1 files changed, 18 insertions, 0 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 6d235262c8..dc3e265bcd 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -391,6 +391,13 @@ class RegisterRestServlet(RestServlet):
# the user-facing checks will probably already have happened in
# /register/email/requestToken when we requested a 3pid, but that's not
# guaranteed.
+ #
+ # Also check that we're not trying to register a 3pid that's already
+ # been registered.
+ #
+ # This has probably happened in /register/email/requestToken as well,
+ # but if a user hits this endpoint twice then clicks on each link from
+ # the two activation emails, they would register the same 3pid twice.
if auth_result:
for login_type in [LoginType.EMAIL_IDENTITY, LoginType.MSISDN]:
@@ -406,6 +413,17 @@ class RegisterRestServlet(RestServlet):
Codes.THREEPID_DENIED,
)
+ existingUid = yield self.store.get_user_id_by_threepid(
+ medium, address,
+ )
+
+ if existingUid is not None:
+ raise SynapseError(
+ 400,
+ "%s is already in use" % medium,
+ Codes.THREEPID_IN_USE,
+ )
+
if registered_user_id is not None:
logger.info(
"Already registered user ID %r for this session",
|
