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-rw-r--r--synapse/util/threepids.py13
1 files changed, 12 insertions, 1 deletions
diff --git a/synapse/util/threepids.py b/synapse/util/threepids.py
index 389adf00f6..1e9c2faa64 100644
--- a/synapse/util/threepids.py
+++ b/synapse/util/threepids.py
@@ -32,7 +32,12 @@ logger = logging.getLogger(__name__)
 MAX_EMAIL_ADDRESS_LENGTH = 500
 
 
-def check_3pid_allowed(hs: "HomeServer", medium: str, address: str) -> bool:
+async def check_3pid_allowed(
+    hs: "HomeServer",
+    medium: str,
+    address: str,
+    registration: bool = False,
+) -> bool:
     """Checks whether a given format of 3PID is allowed to be used on this HS
 
     Args:
@@ -40,9 +45,15 @@ def check_3pid_allowed(hs: "HomeServer", medium: str, address: str) -> bool:
         medium: 3pid medium - e.g. email, msisdn
         address: address within that medium (e.g. "wotan@matrix.org")
             msisdns need to first have been canonicalised
+        registration: whether we want to bind the 3PID as part of registering a new user.
+
     Returns:
         bool: whether the 3PID medium/address is allowed to be added to this HS
     """
+    if not await hs.get_password_auth_provider().is_3pid_allowed(
+        medium, address, registration
+    ):
+        return False
 
     if hs.config.registration.allowed_local_3pids:
         for constraint in hs.config.registration.allowed_local_3pids: