feat: notify keys

lib/notifications.dart

@@ -1,6 +1,9 @@
+import 'dart:convert';
 import 'dart:developer' as developer;
 import 'dart:io';
 
+import 'package:convert/convert.dart';
+import 'package:crypto/crypto.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter_dotenv/flutter_dotenv.dart';
@@ -19,10 +22,60 @@ class Notepush {
     final pubkey = signer.getPublicKey();
     final url =
         "$base/user-info/$pubkey/${Uri.encodeComponent(token)}?backend=fcm";
-    developer.log(url);
+    final rsp = await _sendPutRequest(url);
-    final auth = await _makeAuth("PUT", url);
+    return rsp.body;
+  }
+
+  Future<List<String>> getWatchedKeys() async {
+    final pubkey = signer.getPublicKey();
+    final url = "$base/user-info/$pubkey/notify";
+    final rsp = await _sendGetRequest(url);
+    final List<dynamic> obj = JsonCodec().decode(rsp.body);
+    return List<String>.from(obj);
+  }
+
+  Future<void> watchPubkey(String target, List<int> kinds) async {
+    final pubkey = signer.getPublicKey();
+    final url = "$base/user-info/$pubkey/notify/$target";
+    await _sendPutRequest(url, body: {"kinds": kinds});
+  }
+
+  Future<void> removeWatchPubkey(String target) async {
+    final pubkey = signer.getPublicKey();
+    final url = "$base/user-info/$pubkey/notify/$target";
+    await _sendDeleteRequest(url);
+  }
+
+  Future<void> setNotificationSettings(String token, List<int> kinds) async {
+    final pubkey = signer.getPublicKey();
+    final url =
+        "$base/user-info/$pubkey/${Uri.encodeComponent(token)}/preference";
+    await _sendPutRequest(url, body: {"kinds": kinds});
+  }
+
+  Future<http.Response> _sendPutRequest(String url, {Object? body}) async {
+    final jsonBody = body != null ? JsonCodec().encode(body) : null;
+    final auth = await _makeAuth("PUT", url, body: jsonBody);
     final rsp = await http
         .put(
+          Uri.parse(url),
+          body: jsonBody,
+          headers: {
+            "authorization": "Nostr $auth",
+            "accept": "application/json",
+            "content-type": "application/json",
+          },
+        )
+        .timeout(Duration(seconds: 10));
+    developer.log(rsp.body);
+    return rsp;
+  }
+
+  Future<http.Response> _sendGetRequest(String url, {Object? body}) async {
+    final jsonBody = body != null ? JsonCodec().encode(body) : null;
+    final auth = await _makeAuth("GET", url, body: jsonBody);
+    final rsp = await http
+        .get(
           Uri.parse(url),
           headers: {
             "authorization": "Nostr $auth",
@@ -32,18 +85,40 @@ class Notepush {
         )
         .timeout(Duration(seconds: 10));
     developer.log(rsp.body);
-    return rsp.body;
+    return rsp;
   }
 
-  Future<String> _makeAuth(String method, String url) async {
+  Future<http.Response> _sendDeleteRequest(String url, {Object? body}) async {
+    final jsonBody = body != null ? JsonCodec().encode(body) : null;
+    final auth = await _makeAuth("DELETE", url, body: jsonBody);
+    final rsp = await http
+        .delete(
+          Uri.parse(url),
+          headers: {
+            "authorization": "Nostr $auth",
+            "accept": "application/json",
+            "content-type": "application/json",
+          },
+        )
+        .timeout(Duration(seconds: 10));
+    developer.log(rsp.body);
+    return rsp;
+  }
+
+  Future<String> _makeAuth(String method, String url, {String? body}) async {
     final pubkey = signer.getPublicKey();
+    var tags = [
+      ["u", url],
+      ["method", method],
+    ];
+    if (body != null) {
+      final hash = hex.encode(sha256.convert(utf8.encode(body)).bytes);
+      tags.add(["payload", hash]);
+    }
     final authEvent = Nip01Event(
       pubKey: pubkey,
       kind: 27235,
-      tags: [
+      tags: tags,
-        ["u", url],
-        ["method", "PUT"],
-      ],
       content: "",
     );
     await signer.sign(authEvent);
@@ -51,6 +126,13 @@ class Notepush {
   }
 }
 
+Notepush? getNotificationService() {
+  final signer = ndk.accounts.getLoggedAccount()?.signer;
+  return signer != null
+      ? Notepush(dotenv.env["NOTEPUSH_URL"]!, signer: signer)
+      : null;
+}
+
 Future<void> setupNotifications() async {
   await Firebase.initializeApp();
 
@@ -62,7 +144,7 @@ Future<void> setupNotifications() async {
       developer.log(msg.notification?.body ?? "");
       final notification = msg.notification;
       if (notification != null && notification.android != null) {
-        /*FlutterLocalNotificationsPlugin().show(
+        FlutterLocalNotificationsPlugin().show(
           notification.hashCode,
           notification.title,
           notification.body,
@@ -72,8 +154,13 @@ Future<void> setupNotifications() async {
               "fcm",
             ),
           ),
-        );*/
+        );
-        // TODO: foreground notification
+      }
+    });
+    FirebaseMessaging.onMessageOpenedApp.listen((msg) {
+      final notification = msg.notification;
+      if (notification != null) {
+        // TODO: redirect to stream
       }
     });
     await fbase.setAutoInitEnabled(true);
@@ -92,6 +179,7 @@ Future<void> setupNotifications() async {
     fbase.onTokenRefresh.listen((token) async {
       developer.log("NEW TOKEN: $token");
       await pusher.register(token);
+      await pusher.setNotificationSettings(token, [30_311]);
     });
 
     if (Platform.isIOS) {
@@ -105,5 +193,6 @@ Future<void> setupNotifications() async {
       throw "Push token is null";
     }
     await pusher.register(fcmToken);
+    await pusher.setNotificationSettings(fcmToken, [30_311]);
   }
 }

lib/pages/stream.dart

@@ -13,6 +13,7 @@ import 'package:zap_stream_flutter/theme.dart';
 import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/button.dart';
 import 'package:zap_stream_flutter/widgets/chat.dart';
+import 'package:zap_stream_flutter/widgets/notifications_button.dart';
 import 'package:zap_stream_flutter/widgets/pill.dart';
 import 'package:zap_stream_flutter/widgets/profile.dart';
 import 'package:zap_stream_flutter/widgets/stream_info.dart';
@@ -157,6 +158,7 @@ class _StreamPage extends State<StreamPage> with RouteAware {
         ProfileWidget.pubkey(
           stream.info.host,
           children: [
+            NotificationsButtonWidget(stream: widget.stream),
             Spacer(),
             BasicButton(
               Row(

lib/widgets/notifications_button.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+import 'package:zap_stream_flutter/notifications.dart';
+import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
+
+class NotificationsButtonWidget extends StatefulWidget {
+  final StreamEvent stream;
+
+  const NotificationsButtonWidget({super.key, required this.stream});
+
+  @override
+  State<StatefulWidget> createState() => _NotificationsButtonWidget();
+}
+
+class _NotificationsButtonWidget extends State<NotificationsButtonWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+      future: () async {
+        final n = getNotificationService();
+        return await n?.getWatchedKeys();
+      }(),
+      builder: (context, state) {
+        if (state.data == null) {
+          return SizedBox.shrink();
+        } else {
+          final isNotified = (state.data ?? []).contains(
+            widget.stream.info.host,
+          );
+          return IconButton(
+            iconSize: 20,
+            onPressed: () async {
+              final n = getNotificationService();
+              if (n == null) return;
+
+              if (isNotified) {
+                await n.removeWatchPubkey(widget.stream.info.host);
+              } else {
+                await n.watchPubkey(widget.stream.info.host, [30311]);
+              }
+              setState(() {
+                // reload widget
+              });
+            },
+            style: ButtonStyle(
+              padding: WidgetStatePropertyAll(EdgeInsets.all(0)),
+              backgroundColor: WidgetStateColor.resolveWith((_) => LAYER_2),
+            ),
+            icon: Icon(
+              isNotified ? Icons.notifications_off : Icons.notification_add,
+            ),
+          );
+        }
+      },
+    );
+  }
+}