frontend: add filtering by protocol type to summary tables (#40)

* frontend: add option to filter by protocol type

Closes #33.

* frontend: use case insensitive comparisons for protocol filter

frontend/render_test.go

@@ -77,3 +77,36 @@ func TestSummaryTableXSS(t *testing.T) {
 		t.Errorf("XSS injection succeeded: %s", result)
 	}
 }
+
+func TestSummaryTableProtocolFilter(t *testing.T) {
+	initSettings()
+	setting.protocolFilter = []string{"Static", "Direct", "Babel"}
+	data := `BIRD 2.0.8 ready.
+Name       Proto      Table      State  Since         Info
+static1    Static     master4    up     2021-08-27
+static2    Static     master6    up     2021-08-27
+device1    Device     ---        up     2021-08-27
+kernel1    Kernel     master6    up     2021-08-27
+kernel2    Kernel     master4    up     2021-08-27
+direct1    Direct     ---        up     2021-08-27
+int_babel  Babel      ---        up     2021-08-27    `
+
+	result := summaryTable(data, "testserver")
+	expectedInclude := []string{"static1", "static2", "int_babel", "direct1"}
+	expectedExclude := []string{"device1", "kernel1", "kernel2"}
+
+	for _, item := range expectedInclude {
+		if !strings.Contains(result, item) {
+			t.Errorf("Did not find expected %s in summary table output", result)
+		}
+	}
+	for _, item := range expectedExclude {
+		if strings.Contains(result, item) {
+			t.Errorf("Found unexpected %s in summary table output", result)
+		}
+	}
+
+	t.Cleanup(func() {
+		setting.protocolFilter = []string{}
+	})
+}