feat: xmrrpc (and wowrpc) uri parsing + tests

lib/utilities/node_uri_util.dart

@@ -0,0 +1,132 @@
+abstract interface class NodeQrData {
+  final String host;
+  final int port;
+  final String? label;
+
+  NodeQrData({required this.host, required this.port, this.label});
+
+  String encode();
+  String get scheme;
+}
+
+abstract class LibMoneroNodeQrData extends NodeQrData {
+  final String user;
+  final String password;
+
+  LibMoneroNodeQrData({
+    required super.host,
+    required super.port,
+    super.label,
+    required this.user,
+    required this.password,
+  });
+
+  @override
+  String encode() {
+    String? userInfo;
+    if (user.isNotEmpty) {
+      userInfo = user;
+      if (password.isNotEmpty) {
+        userInfo += ":$password";
+      }
+    }
+
+    final uri = Uri(
+      scheme: scheme,
+      userInfo: userInfo,
+      port: port,
+      host: host,
+      queryParameters: {"label": label},
+    );
+
+    return uri.toString();
+  }
+
+  @override
+  String toString() {
+    return "$runtimeType {"
+        "scheme: $scheme, "
+        "host: $host, "
+        "port: $port, "
+        "user: $user, "
+        "password: $password, "
+        "label: $label"
+        "}";
+  }
+}
+
+class MoneroNodeQrData extends LibMoneroNodeQrData {
+  MoneroNodeQrData({
+    required super.host,
+    required super.port,
+    required super.user,
+    required super.password,
+    super.label,
+  });
+
+  @override
+  String get scheme => "xmrrpc";
+}
+
+class WowneroNodeQrData extends LibMoneroNodeQrData {
+  WowneroNodeQrData({
+    required super.host,
+    required super.port,
+    required super.user,
+    required super.password,
+    super.label,
+  });
+
+  @override
+  String get scheme => "wowrpc";
+}
+
+abstract final class NodeQrUtil {
+  static ({String? user, String? password}) _parseUserInfo(String? userInfo) {
+    if (userInfo == null || userInfo.isEmpty) {
+      return (user: null, password: null);
+    }
+
+    final splitIndex = userInfo.indexOf(":");
+    if (splitIndex == -1) {
+      return (user: userInfo, password: null);
+    }
+
+    return (
+      user: userInfo.substring(0, splitIndex),
+      password: userInfo.substring(splitIndex + 1),
+    );
+  }
+
+  static NodeQrData decodeUri(String uriString) {
+    final uri = Uri.tryParse(uriString);
+    if (uri == null) throw Exception("Invalid uri string.");
+    if (!uri.hasAuthority) throw Exception("Uri has no authority.");
+
+    final userInfo = _parseUserInfo(uri.userInfo);
+
+    final query = uri.queryParameters;
+
+    switch (uri.scheme) {
+      case "xmrrpc":
+        return MoneroNodeQrData(
+          host: uri.host,
+          port: uri.port,
+          user: userInfo.user ?? "",
+          password: userInfo.password ?? "",
+          label: query["label"],
+        );
+      case "wowrpc":
+        return WowneroNodeQrData(
+          host: uri.host,
+          port: uri.port,
+          user: userInfo.user ?? "",
+          password: userInfo.password ?? "",
+          label: query["label"],
+        );
+
+      default:
+        throw Exception("Unknown node uri scheme \"${uri.scheme}\" found.");
+    }
+  }
+}

test/utilities/node_uri_util_test.dart

@@ -0,0 +1,104 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:stackwallet/utilities/node_uri_util.dart';
+
+void main() {
+  test("Valid xmrrpc scheme node uri", () {
+    expect(
+      NodeQrUtil.decodeUri(
+        "xmrrpc://nodo:password@bob.onion:18083?label=Nodo Tor Node",
+      ),
+      isA<MoneroNodeQrData>(),
+    );
+  });
+
+  test("Valid wowrpc scheme node uri", () {
+    expect(
+      NodeQrUtil.decodeUri(
+        "wowrpc://nodo:password@10.0.0.10:18083",
+      ),
+      isA<WowneroNodeQrData>(),
+    );
+  });
+
+  test("Invalid authority node uri", () {
+    String? message;
+    try {
+      NodeQrUtil.decodeUri(
+        "nodo:password@bob.onion:18083?label=Nodo Tor Node",
+      );
+    } catch (e) {
+      message = e.toString();
+    }
+    expect(message, "Exception: Uri has no authority.");
+  });
+
+  test("Empty uri string", () {
+    String? message;
+    try {
+      NodeQrUtil.decodeUri("");
+    } catch (e) {
+      message = e.toString();
+    }
+    expect(message, "Exception: Uri has no authority.");
+  });
+
+  test("Invalid uri string", () {
+    String? message;
+    try {
+      NodeQrUtil.decodeUri("::invalid@@@.ok");
+    } catch (e) {
+      message = e.toString();
+    }
+    expect(message, "Exception: Invalid uri string.");
+  });
+
+  test("Unknown uri string", () {
+    String? message;
+    try {
+      NodeQrUtil.decodeUri("http://u:p@host.com:80/lol?hmm=42");
+    } catch (e) {
+      message = e.toString();
+    }
+    expect(message, "Exception: Unknown node uri scheme \"http\" found.");
+  });
+
+  test("decoding to model", () {
+    final data = NodeQrUtil.decodeUri(
+      "xmrrpc://nodo:password@bob.onion:18083?label=Nodo+Tor+Node",
+    );
+    expect(data.scheme, "xmrrpc");
+    expect(data.host, "bob.onion");
+    expect(data.port, 18083);
+    expect(data.label, "Nodo Tor Node");
+    expect((data as MoneroNodeQrData?)?.user, "nodo");
+    expect((data as MoneroNodeQrData?)?.password, "password");
+  });
+
+  test("encoding to string", () {
+    const validString =
+        "xmrrpc://nodo:password@bob.onion:18083?label=Nodo+Tor+Node";
+    final data = NodeQrUtil.decodeUri(
+      validString,
+    );
+    expect(data.encode(), validString);
+  });
+
+  test("normal to string", () {
+    const validString =
+        "xmrrpc://nodo:password@bob.onion:18083?label=Nodo+Tor+Node";
+    final data = NodeQrUtil.decodeUri(
+      validString,
+    );
+    expect(
+      data.toString(),
+      "MoneroNodeQrData {"
+      "scheme: xmrrpc, "
+      "host: bob.onion, "
+      "port: 18083, "
+      "user: nodo, "
+      "password: password, "
+      "label: Nodo Tor Node"
+      "}",
+    );
+  });
+}