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-rw-r--r--synapse/config/experimental.py3
-rw-r--r--synapse/handlers/register.py9
-rw-r--r--synapse/handlers/saml.py4
-rw-r--r--synapse/handlers/sso.py6
-rw-r--r--synapse/types/__init__.py22
5 files changed, 11 insertions, 33 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index 8e0f5356b4..0970f22a75 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -382,9 +382,6 @@ class ExperimentalConfig(Config):
         # Check that none of the other config options conflict with MSC3861 when enabled
         self.msc3861.check_config_conflicts(self.root)
 
-        # MSC4009: E.164 Matrix IDs
-        self.msc4009_e164_mxids = experimental.get("msc4009_e164_mxids", False)
-
         # MSC4010: Do not allow setting m.push_rules account data.
         self.msc4010_push_rules_account_data = experimental.get(
             "msc4010_push_rules_account_data", False
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index a2d3f03061..3a55056df5 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -143,15 +143,10 @@ class RegistrationHandler:
         assigned_user_id: Optional[str] = None,
         inhibit_user_in_use_error: bool = False,
     ) -> None:
-        if types.contains_invalid_mxid_characters(
-            localpart, self.hs.config.experimental.msc4009_e164_mxids
-        ):
-            extra_chars = (
-                "=_-./+" if self.hs.config.experimental.msc4009_e164_mxids else "=_-./"
-            )
+        if types.contains_invalid_mxid_characters(localpart):
             raise SynapseError(
                 400,
-                f"User ID can only contain characters a-z, 0-9, or '{extra_chars}'",
+                "User ID can only contain characters a-z, 0-9, or '=_-./+'",
                 Codes.INVALID_USERNAME,
             )
 
diff --git a/synapse/handlers/saml.py b/synapse/handlers/saml.py
index 874860d461..6083c9f4b5 100644
--- a/synapse/handlers/saml.py
+++ b/synapse/handlers/saml.py
@@ -27,9 +27,9 @@ from synapse.http.servlet import parse_string
 from synapse.http.site import SynapseRequest
 from synapse.module_api import ModuleApi
 from synapse.types import (
+    MXID_LOCALPART_ALLOWED_CHARACTERS,
     UserID,
     map_username_to_mxid_localpart,
-    mxid_localpart_allowed_characters,
 )
 from synapse.util.iterutils import chunk_seq
 
@@ -371,7 +371,7 @@ class SamlHandler:
 
 
 DOT_REPLACE_PATTERN = re.compile(
-    "[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),)
+    "[^%s]" % (re.escape("".join(MXID_LOCALPART_ALLOWED_CHARACTERS)),)
 )
 
 
diff --git a/synapse/handlers/sso.py b/synapse/handlers/sso.py
index c3a51722bd..4d29328a74 100644
--- a/synapse/handlers/sso.py
+++ b/synapse/handlers/sso.py
@@ -225,8 +225,6 @@ class SsoHandler:
 
         self._consent_at_registration = hs.config.consent.user_consent_at_registration
 
-        self._e164_mxids = hs.config.experimental.msc4009_e164_mxids
-
     def register_identity_provider(self, p: SsoIdentityProvider) -> None:
         p_id = p.idp_id
         assert p_id not in self._identity_providers
@@ -713,7 +711,7 @@ class SsoHandler:
         # Since the localpart is provided via a potentially untrusted module,
         # ensure the MXID is valid before registering.
         if not attributes.localpart or contains_invalid_mxid_characters(
-            attributes.localpart, self._e164_mxids
+            attributes.localpart
         ):
             raise MappingException("localpart is invalid: %s" % (attributes.localpart,))
 
@@ -946,7 +944,7 @@ class SsoHandler:
             localpart,
         )
 
-        if contains_invalid_mxid_characters(localpart, self._e164_mxids):
+        if contains_invalid_mxid_characters(localpart):
             raise SynapseError(400, "localpart is invalid: %s" % (localpart,))
         user_id = UserID(localpart, self._server_name).to_string()
         user_infos = await self._store.get_users_by_id_case_insensitive(user_id)
diff --git a/synapse/types/__init__.py b/synapse/types/__init__.py
index 095be070e0..fdfd465c8d 100644
--- a/synapse/types/__init__.py
+++ b/synapse/types/__init__.py
@@ -348,22 +348,15 @@ class EventID(DomainSpecificString):
     SIGIL = "$"
 
 
-mxid_localpart_allowed_characters = set(
-    "_-./=" + string.ascii_lowercase + string.digits
+MXID_LOCALPART_ALLOWED_CHARACTERS = set(
+    "_-./=+" + string.ascii_lowercase + string.digits
 )
-# MSC4007 adds the + to the allowed characters.
-#
-# TODO If this was accepted, update the SSO code to support this, see the callers
-#      of map_username_to_mxid_localpart.
-extended_mxid_localpart_allowed_characters = mxid_localpart_allowed_characters | {"+"}
 
 # Guest user IDs are purely numeric.
 GUEST_USER_ID_PATTERN = re.compile(r"^\d+$")
 
 
-def contains_invalid_mxid_characters(
-    localpart: str, use_extended_character_set: bool
-) -> bool:
+def contains_invalid_mxid_characters(localpart: str) -> bool:
     """Check for characters not allowed in an mxid or groupid localpart
 
     Args:
@@ -374,12 +367,7 @@ def contains_invalid_mxid_characters(
     Returns:
         True if there are any naughty characters
     """
-    allowed_characters = (
-        extended_mxid_localpart_allowed_characters
-        if use_extended_character_set
-        else mxid_localpart_allowed_characters
-    )
-    return any(c not in allowed_characters for c in localpart)
+    return any(c not in MXID_LOCALPART_ALLOWED_CHARACTERS for c in localpart)
 
 
 UPPER_CASE_PATTERN = re.compile(b"[A-Z_]")
@@ -396,7 +384,7 @@ UPPER_CASE_PATTERN = re.compile(b"[A-Z_]")
 #    bytes rather than strings
 #
 NON_MXID_CHARACTER_PATTERN = re.compile(
-    ("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters - {"="})),)).encode(
+    ("[^%s]" % (re.escape("".join(MXID_LOCALPART_ALLOWED_CHARACTERS - {"="})),)).encode(
         "ascii"
     )
 )