fix allowlist case-insensitive lookup (#642)

Author: winhowes

app/allowlist.go

@@ -113,7 +113,7 @@ func SetAllowlist(name string, callers []CallerConfig) error {
 // GetAllowlist retrieves the allowlist for an integration.
 func GetAllowlist(name string) []CallerConfig {
 	allowlists.RLock()
-	m := allowlists.m[name]
+	m := allowlists.m[strings.ToLower(name)]
 	res := make([]CallerConfig, 0, len(m))
 	for _, c := range m {
 		res = append(res, c)

app/allowlist_test.go

@@ -193,6 +193,21 @@ func TestSetAllowlistIndexing(t *testing.T) {
 	}
 }
 
+func TestGetAllowlistCaseInsensitive(t *testing.T) {
+	allowlists.Lock()
+	allowlists.m = make(map[string]map[string]CallerConfig)
+	allowlists.Unlock()
+
+	if err := SetAllowlist("MiXeD", []CallerConfig{{ID: "caller"}}); err != nil {
+		t.Fatalf("failed to set allowlist: %v", err)
+	}
+
+	got := GetAllowlist("MIXED")
+	if len(got) != 1 || got[0].ID != "caller" {
+		t.Fatalf("expected case-insensitive allowlist lookup, got %#v", got)
+	}
+}
+
 func TestFindConstraintWildcard(t *testing.T) {
 	allowlists.Lock()
 	allowlists.m = make(map[string]map[string]CallerConfig)