snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

zerver/views/compatibility.py

@@ -0,0 +1,30 @@
+from django.http import HttpRequest, HttpResponse
+from django.utils.translation import gettext as _
+
+from zerver.lib.compatibility import find_mobile_os, version_lt
+from zerver.lib.exceptions import JsonableError
+from zerver.lib.response import json_success
+from zerver.lib.user_agent import parse_user_agent
+
+# Zulip Mobile release 16.2.96 was made 2018-08-22.  It fixed a
+# bug in our Android code that causes spammy, obviously-broken
+# notifications once the "remove_push_notification" feature is
+# enabled on the user's Zulip server.
+android_min_app_version = "16.2.96"
+
+
+def check_global_compatibility(request: HttpRequest) -> HttpResponse:
+    if "User-Agent" not in request.headers:
+        raise JsonableError(_("User-Agent header missing from request"))
+
+    # This string should not be tagged for translation, since old
+    # clients are checking for an extra string.
+    legacy_compatibility_error_message = "Client is too old"
+    user_agent = parse_user_agent(request.headers["User-Agent"])
+    if user_agent["name"] == "ZulipInvalid":
+        raise JsonableError(legacy_compatibility_error_message)
+    if user_agent["name"] == "ZulipMobile":
+        user_os = find_mobile_os(request.headers["User-Agent"])
+        if user_os == "android" and version_lt(user_agent["version"], android_min_app_version):
+            raise JsonableError(legacy_compatibility_error_message)
+    return json_success(request)