hst/dbus: validate interface strings

This is relocated to hst to validate early.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/dbus_test.go

@@ -0,0 +1,109 @@
+package hst_test
+
+import (
+	"reflect"
+	"slices"
+	"testing"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+func TestBadInterfaceError(t *testing.T) {
+	testCases := []struct {
+		name string
+		err  error
+		want string
+	}{
+		{"nil", (*hst.BadInterfaceError)(nil), "<nil>"},
+		{"session", &hst.BadInterfaceError{Interface: "\x00", Segment: "session"},
+			`bad interface string "\x00" in session bus configuration`},
+		{"system", &hst.BadInterfaceError{Interface: "\x01", Segment: "system"},
+			`bad interface string "\x01" in system bus configuration`},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			if gotError := tc.err.Error(); gotError != tc.want {
+				t.Errorf("Error: %s, want %s", gotError, tc.want)
+			}
+			if gotMessage, ok := container.GetErrorMessage(tc.err); !ok {
+				t.Error("GetErrorMessage: ok = false")
+			} else if gotMessage != tc.want {
+				t.Errorf("GetErrorMessage: %s, want %s", gotMessage, tc.want)
+			}
+		})
+	}
+}
+
+func TestBusConfigInterfaces(t *testing.T) {
+	testCases := []struct {
+		name   string
+		c      *hst.BusConfig
+		cutoff int
+		want   []string
+	}{
+		{"nil", nil, 0, nil},
+		{"all", &hst.BusConfig{
+			See: []string{"see"}, Talk: []string{"talk"}, Own: []string{"own"},
+			Call:      map[string]string{"call": "unreachable"},
+			Broadcast: map[string]string{"broadcast": "unreachable"},
+		}, 0, []string{"see", "talk", "own", "call", "broadcast"}},
+
+		{"all cutoff", &hst.BusConfig{
+			See: []string{"see"}, Talk: []string{"talk"}, Own: []string{"own"},
+			Call:      map[string]string{"call": "unreachable"},
+			Broadcast: map[string]string{"broadcast": "unreachable"},
+		}, 3, []string{"see", "talk", "own"}},
+
+		{"cutoff see", &hst.BusConfig{See: []string{"see"}}, 1, []string{"see"}},
+		{"cutoff talk", &hst.BusConfig{Talk: []string{"talk"}}, 1, []string{"talk"}},
+		{"cutoff own", &hst.BusConfig{Own: []string{"own"}}, 1, []string{"own"}},
+		{"cutoff call", &hst.BusConfig{Call: map[string]string{"call": "unreachable"}}, 1, []string{"call"}},
+		{"cutoff broadcast", &hst.BusConfig{Broadcast: map[string]string{"broadcast": "unreachable"}}, 1, []string{"broadcast"}},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var got []string
+			if tc.cutoff > 0 {
+				var i int
+				got = make([]string, 0, tc.cutoff)
+				for v := range tc.c.Interfaces {
+					i++
+					got = append(got, v)
+					if i == tc.cutoff {
+						break
+					}
+				}
+			} else {
+				got = slices.Collect(tc.c.Interfaces)
+			}
+
+			if !slices.Equal(got, tc.want) {
+				t.Errorf("Interfaces: %q, want %q", got, tc.want)
+			}
+		})
+	}
+}
+
+func TestBusConfigCheckInterfaces(t *testing.T) {
+	testCases := []struct {
+		name string
+		c    *hst.BusConfig
+		err  error
+	}{
+		{"nil", nil, nil},
+		{"zero", &hst.BusConfig{See: []string{""}},
+			&hst.BadInterfaceError{Interface: "", Segment: "zero"}},
+		{"suffix", &hst.BusConfig{See: []string{".*"}},
+			&hst.BadInterfaceError{Interface: ".*", Segment: "suffix"}},
+		{"valid suffix", &hst.BusConfig{See: []string{"..*"}}, nil},
+		{"valid", &hst.BusConfig{See: []string{"."}}, nil},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			if err := tc.c.CheckInterfaces(tc.name); !reflect.DeepEqual(err, tc.err) {
+				t.Errorf("CheckInterfaces: error = %#v, want %#v", err, tc.err)
+			}
+		})
+	}
+}