feat(policy): case-insensitive address and domain matching

internal/policy/address_test.go

@@ -0,0 +1,30 @@
+package policy
+
+import "testing"
+
+func TestMatchAddress(t *testing.T) {
+	wl := []string{"bob@example.com", "@trusted.com"}
+	cases := []struct {
+		addr string
+		want bool
+	}{
+		{"bob@example.com", true},
+		{"BOB@Example.com", true},
+		{`"Bob" <bob@example.com>`, true},
+		{"alice@trusted.com", true},
+		{"alice@untrusted.com", false},
+		{"eve@example.com", false},
+		{"", false},
+	}
+	for _, c := range cases {
+		if got := MatchAddress(wl, c.addr); got != c.want {
+			t.Fatalf("MatchAddress(%q)=%v want %v", c.addr, got, c.want)
+		}
+	}
+}
+
+func TestNormalizeAddr(t *testing.T) {
+	if got := NormalizeAddr(`"Bob Smith" <Bob@Example.COM>`); got != "bob@example.com" {
+		t.Fatalf("got %q", got)
+	}
+}