client: Implement Remote Push

pkg/connector/client.go

@@ -48,6 +48,7 @@ var (
 	_ bridgev2.NetworkAPI                    = (*TwitterClient)(nil)
 	_ bridgev2.ReactionHandlingNetworkAPI    = (*TwitterClient)(nil)
 	_ bridgev2.ReadReceiptHandlingNetworkAPI = (*TwitterClient)(nil)
+	_ bridgev2.PushableNetworkAPI            = (*TwitterClient)(nil)
 )
 
 func NewTwitterClient(ctx context.Context, tc *TwitterConnector, login *bridgev2.UserLogin) *TwitterClient {
@@ -72,6 +73,39 @@ func NewTwitterClient(ctx context.Context, tc *TwitterConnector, login *bridgev2
 	return twitClient
 }
 
+var pushCfg = &bridgev2.PushConfig{
+	Web: &bridgev2.WebPushConfig{VapidKey: "BF5oEo0xDUpgylKDTlsd8pZmxQA1leYINiY-rSscWYK_3tWAkz4VMbtf1MLE_Yyd6iII6o-e3Q9TCN5vZMzVMEs"},
+}
+
+func (tc *TwitterClient) GetPushConfigs() *bridgev2.PushConfig {
+	return pushCfg
+}
+
+func (tc *TwitterClient) RegisterPushNotifications(ctx context.Context, pushType bridgev2.PushType, token string) error {
+	if tc.client == nil {
+		return bridgev2.ErrNotLoggedIn
+	}
+	switch pushType {
+	case bridgev2.PushTypeWeb:
+		meta := tc.userLogin.Metadata.(*UserLoginMetadata)
+		if meta.PushKeys == nil {
+			meta.GeneratePushKeys()
+			err := tc.userLogin.Save(ctx)
+			if err != nil {
+				return fmt.Errorf("failed to save push key: %w", err)
+			}
+		}
+		pc := twittermeow.WebPushConfig{
+			Endpoint: token,
+			Auth:     meta.PushKeys.Auth,
+			P256DH:   meta.PushKeys.P256DH,
+		}
+		return tc.client.SetPushNotificationConfig(twittermeow.REGISTER, pc)
+	default:
+		return fmt.Errorf("unsupported push type: %v", pushType)
+	}
+}
+
 func (tc *TwitterClient) Connect(ctx context.Context) error {
 	if tc.client == nil {
 		tc.userLogin.BridgeState.Send(status.BridgeState{

pkg/connector/connector.go

@@ -71,10 +71,6 @@ func (tc *TwitterConnector) GetCapabilities() *bridgev2.NetworkGeneralCapabiliti
 	return &bridgev2.NetworkGeneralCapabilities{}
 }
 
-type UserLoginMetadata struct {
-	Cookies string
-}
-
 func (tc *TwitterConnector) LoadUserLogin(ctx context.Context, login *bridgev2.UserLogin) error {
 	twitClient := NewTwitterClient(ctx, tc, login)
 

pkg/connector/dbmeta.go

@@ -0,0 +1,29 @@
+package connector
+
+import (
+	"crypto/ecdh"
+	"crypto/rand"
+
+	"go.mau.fi/util/exerrors"
+	"go.mau.fi/util/random"
+)
+
+type UserLoginMetadata struct {
+	Cookies  string
+	PushKeys *PushKeys `json:"push_keys,omitempty"`
+}
+
+type PushKeys struct {
+	P256DH  []byte `json:"p256dh"`
+	Auth    []byte `json:"auth"`
+	Private []byte `json:"private"`
+}
+
+func (m *UserLoginMetadata) GeneratePushKeys() {
+	privateKey := exerrors.Must(ecdh.P256().GenerateKey(rand.Reader))
+	m.PushKeys = &PushKeys{
+		P256DH:  privateKey.Public().(*ecdh.PublicKey).Bytes(),
+		Auth:    random.Bytes(16),
+		Private: privateKey.Bytes(),
+	}
+}