Applications filter: ignore app name case

This lets messages with inconsistently cased app names match the
appropriate filters.

Fixes: #854

Signed-off-by: Nils Philippsen <nils@redhat.com>

fmn/rules/filter.py

@@ -24,10 +24,15 @@ def matches(self, message: message.Message):
 class Applications(Filter):
     name = "applications"
 
+    def __init__(self, requester: Requester, params, username):
+        if params:
+            params = [app_name.lower() for app_name in params]
+        super().__init__(requester=requester, params=params, username=username)
+
     def matches(self, message):
         if not self.params:
             return True
-        return message.app_name in self.params
+        return message.app_name.lower() in self.params
 
 
 class Severities(Filter):

tests/rules/test_filter.py

@@ -17,7 +17,12 @@ def requester():
 
 @pytest.mark.parametrize(
     "received,filtered,expected",
-    [("app1", ["app1", "app2"], True), ("app3", ["app1", "app2"], False), ("app1", None, True)],
+    [
+        ("app1", ["app1", "app2"], True),
+        ("app3", ["app1", "app2"], False),
+        ("app1", None, True),
+        ("App1", ["aPP1"], True),
+    ],
 )
 def test_applications(requester, make_mocked_message, received, filtered, expected):
     msg = make_mocked_message(topic="dummy", body={"app": received})