feat: live streaming

closes #43

lib/api.dart

@@ -0,0 +1,260 @@
+import 'dart:convert';
+import 'dart:developer' as developer;
+
+import 'package:convert/convert.dart';
+import 'package:crypto/crypto.dart';
+import 'package:http/http.dart' as http;
+import 'package:ndk/ndk.dart';
+import 'package:zap_stream_flutter/const.dart';
+
+class IngestEndpoint {
+  final String name;
+  final String url;
+  final String key;
+  final IngestCost cost;
+  final List<String> capabilities;
+
+  const IngestEndpoint({
+    required this.name,
+    required this.url,
+    required this.key,
+    required this.cost,
+    required this.capabilities,
+  });
+
+  static IngestEndpoint fromJson(Map<String, dynamic> json) {
+    return IngestEndpoint(
+      name: json["name"],
+      url: json["url"],
+      key: json["key"],
+      cost: IngestCost.fromJson(json["cost"]),
+      capabilities: List<String>.from(json["capabilities"]),
+    );
+  }
+
+  @override
+  int get hashCode => name.hashCode;
+
+  @override
+  bool operator ==(Object other) {
+    if (other is IngestEndpoint) {
+      return other.name == name;
+    }
+    return false;
+  }
+}
+
+class IngestCost {
+  final String unit;
+  final double rate;
+
+  const IngestCost({required this.unit, required this.rate});
+
+  static IngestCost fromJson(Map<String, dynamic> json) {
+    return IngestCost(unit: json["unit"], rate: json["rate"]);
+  }
+}
+
+class TosAccepted {
+  final bool accepted;
+  final String? link;
+
+  const TosAccepted({required this.accepted, required this.link});
+
+  static TosAccepted fromJson(Map<String, dynamic> json) {
+    return TosAccepted(accepted: json["accepted"], link: json["link"]);
+  }
+}
+
+class AccountInfo {
+  final double balance;
+  final List<IngestEndpoint> endpoints;
+  final TosAccepted tos;
+  final EventInfo? details;
+
+  const AccountInfo({
+    required this.balance,
+    required this.endpoints,
+    required this.tos,
+    this.details,
+  });
+
+  static AccountInfo fromJson(Map<String, dynamic> json) {
+    final balance = json["balance"] as int;
+    final endpoints = json["endpoints"] as Iterable<dynamic>;
+    return AccountInfo(
+      balance: balance.toDouble(),
+      endpoints: endpoints.map((e) => IngestEndpoint.fromJson(e)).toList(),
+      tos: TosAccepted.fromJson(json["tos"]),
+      details:
+          json.containsKey("details")
+              ? EventInfo.fromJson(json["details"])
+              : null,
+    );
+  }
+}
+
+class EventInfo {
+  final String? id;
+  final String? title;
+  final String? summary;
+  final String? image;
+  final String? contentWarning;
+  final String? goal;
+  final List<String>? tags;
+
+  EventInfo({
+    required this.id,
+    required this.title,
+    required this.summary,
+    required this.image,
+    required this.contentWarning,
+    required this.goal,
+    required this.tags,
+  });
+
+  static EventInfo fromJson(Map<String, dynamic> json) {
+    return EventInfo(
+      id: json["id"],
+      title: json["title"],
+      summary: json["summary"],
+      image: json["image"],
+      contentWarning: json["content_warning"],
+      goal: json["goal"],
+      tags: json.containsKey("tags") ? List<String>.from(json["tags"]) : null,
+    );
+  }
+}
+
+class ZapStreamApi {
+  final String base;
+  final EventSigner signer;
+
+  ZapStreamApi(this.base, this.signer);
+
+  static ZapStreamApi instance() {
+    return ZapStreamApi(apiUrl, ndk.accounts.getLoggedAccount()!.signer);
+  }
+
+  Future<AccountInfo> getAccountInfo() async {
+    final url = "$base/account";
+    final rsp = await _sendGetRequest(url);
+    return AccountInfo.fromJson(JsonCodec().decode(rsp.body));
+  }
+
+  Future<void> updateDefaultStreamInfo({
+    String? title,
+    String? summary,
+    String? image,
+    String? contentWarning,
+    String? goal,
+    List<String>? tags,
+  }) async {
+    final url = "$base/event";
+    await _sendPatchRequest(
+      url,
+      body: {
+        "title": title,
+        "summary": summary,
+        "image": image,
+        "content_warning": contentWarning,
+        "goal": goal,
+        "tags": tags,
+      },
+    );
+  }
+
+  Future<void> acceptTos() async {
+    await _sendPatchRequest("$base/account", body: {"accept_tos": true});
+  }
+
+  Future<http.Response> _sendPatchRequest(String url, {Object? body}) async {
+    final jsonBody = body != null ? JsonCodec().encode(body) : null;
+    final auth = await _makeAuth("PATCH", url, body: jsonBody);
+    final rsp = await http
+        .patch(
+          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> _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",
+            "accept": "application/json",
+            "content-type": "application/json",
+          },
+        )
+        .timeout(Duration(seconds: 10));
+    developer.log(rsp.body);
+    return rsp;
+  }
+
+  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,
+      content: "",
+    );
+    await signer.sign(authEvent);
+    return authEvent.toBase64();
+  }
+}