Cw 1539 lightning enhancements (#3400)

* feat: add Lightning transaction URL support in transaction details view model

* fix: update currency selection logic in WalletAddressListViewModel and ReceivePage

* feat: integrate computed transaction amount and fee getters in TransactionDetailsViewModel, refactor CopyWrapper logic in TransactionDetailsModal

* refactor: apply lint rules

* refactor: apply lint rules and improve LNURL handling with new methods for withdrawal requests and error checks

* auto-reformat

* fix: receive_page regression

* fix: Withdraw lightning to other btc wallet gives LN address

* chore: update .lock files [skip ci]

---------

Co-authored-by: Robert Malikowski <malikowskirobert@gmail.com>
Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_core/lib/lnurl.dart

@@ -1,19 +1,20 @@
-import 'dart:convert';
+import "dart:convert";
 
-import 'package:bech32/bech32.dart';
-import 'package:cw_core/amount/money.dart';
-import 'package:cw_core/crypto_currency.dart';
-import 'package:cw_core/utils/proxy_wrapper.dart';
+import "package:bech32/bech32.dart";
+import "package:cw_core/amount/money.dart";
+import "package:cw_core/crypto_currency.dart";
+import "package:cw_core/utils/proxy_wrapper.dart";
 
 const _BOLT_PREFIXES = ["lnbcrt", "lntbs", "lnbc", "lntb"];
-const _LUD17_PREFIXES = ['lnurlw', 'lnurlc', 'lnurlp', 'keyauth'];
+const _LUD17_PREFIXES = ["lnurlw", "lnurlc", "lnurlp", "keyauth"];
 
 bool isBolt11ZeroInvoice(String invoice) {
   try {
-    final request = Bech32Codec().decode(invoice.replaceFirst("lightning:", ""), invoice.length);
+    final request =
+        const Bech32Codec().decode(invoice.replaceFirst("lightning:", ""), invoice.length);
 
     final prefix =
-        _BOLT_PREFIXES.firstWhere((prefix) => request.hrp.startsWith(prefix), orElse: () => "");
+        _BOLT_PREFIXES.firstWhere(request.hrp.startsWith, orElse: () => "");
 
     return request.hrp.length == prefix.length;
   } catch (e) {
@@ -23,48 +24,56 @@ bool isBolt11ZeroInvoice(String invoice) {
 
 /// Get the amount of a Bolt 11 Invoice in
 int? _getAmountBolt11Msat(String invoice) {
-  final request = Bech32Codec().decode(invoice.replaceFirst("lightning:", ""), invoice.length);
+  final request =
+      const Bech32Codec().decode(invoice.replaceFirst("lightning:", ""), invoice.length);
 
   final prefix = _BOLT_PREFIXES.firstWhere(
-    (prefix) => request.hrp.startsWith(prefix),
-    orElse: () => throw FormatException('Invalid BOLT11 invoice: unknown HRP prefix.'),
+    request.hrp.startsWith,
+    orElse: () => throw const FormatException("Invalid BOLT11 invoice: unknown HRP prefix."),
   );
 
   final amountPart = request.hrp.substring(prefix.length);
-  if (amountPart.isEmpty) return null; // zero-amount invoice
+  if (amountPart.isEmpty) {
+    return null; // zero-amount invoice
+  }
 
-  final hasMultiplier = RegExp(r'[munp]$').hasMatch(amountPart);
-  final multiplier = hasMultiplier ? amountPart[amountPart.length - 1] : '';
+  final hasMultiplier = RegExp(r"[munp]$").hasMatch(amountPart);
+  final multiplier = hasMultiplier ? amountPart[amountPart.length - 1] : "";
   final numberStr = hasMultiplier ? amountPart.substring(0, amountPart.length - 1) : amountPart;
 
-  if (numberStr.isEmpty || !RegExp(r'^\d+$').hasMatch(numberStr)) {
-    throw FormatException('Invalid BOLT11 invoice: invalid amount number in HRP.');
+  if (numberStr.isEmpty || !RegExp(r"^\d+$").hasMatch(numberStr)) {
+    throw const FormatException("Invalid BOLT11 invoice: invalid amount number in HRP.");
   }
 
   final amount = int.parse(numberStr);
 
   switch (multiplier) {
-    case '': // bitcoin
+    case "": // bitcoin
       return amount * 100000000000;
-    case 'm': // milli-bitcoin
+    case "m": // milli-bitcoin
       return amount * 100000000;
-    case 'u': // micro-bitcoin
+    case "u": // micro-bitcoin
       return amount * 100000;
-    case 'n': // nano-bitcoin
+    case "n": // nano-bitcoin
       return amount * 100;
-    case 'p':
+    case "p":
       if (amount % 10 != 0) {
-        throw FormatException('Invalid BOLT11 invoice: amount not representable in whole msat.');
+        throw const FormatException(
+          "Invalid BOLT11 invoice: amount not representable in whole msat.",
+        );
       }
       return amount ~/ 10;
     default:
-      throw FormatException('Invalid BOLT11 invoice: unknown amount multiplier.');
+      throw const FormatException("Invalid BOLT11 invoice: unknown amount multiplier.");
   }
 }
 
 Money? getBolt11Amount(String invoice) {
   final msat = _getAmountBolt11Msat(invoice);
-  if (msat == null || msat % 1000 != 0) return null;
+  if (msat == null || msat % 1000 != 0) {
+    return null;
+  }
+
   return Money.fromInt(msat ~/ 1000, CryptoCurrency.btcln);
 }
 
@@ -73,30 +82,99 @@ class LNURL {
     final url = decode(lnurl);
     final response = await ProxyWrapper().get(clearnetUri: url);
 
-    if (response.statusCode != 200) return null;
+    if (response.statusCode != 200) {
+      return null;
+    }
 
     try {
       final body = jsonDecode(response.body) as Map;
       final tag = body["tag"] as String?;
 
-      if (tag != "payRequest") return null;
+      if (tag != "payRequest") {
+        return null;
+      }
 
       final msat = body["minSendable"] as int?;
       final maxSendable = body["maxSendable"] as int?;
 
       // if minSendable and maxSendable are the same we assume a specific payment request
-      if (msat != maxSendable) return null;
+      if (msat != maxSendable) {
+        return null;
+      }
 
-      if (msat == null || msat % 1000 != 0) return null;
+      if (msat == null || msat % 1000 != 0) {
+        return null;
+      }
       return Money.fromInt(msat ~/ 1000, CryptoCurrency.btcln);
     } catch (_) {
       return null;
     }
   }
 
+  static Future<LNURLWithdrawRequest?> getWithdrawRequest(String lnurl) async {
+    final url = decode(lnurl);
+    final response = await ProxyWrapper().get(clearnetUri: url);
+
+    if (response.statusCode != 200) {
+      return null;
+    }
+
+    try {
+      final body = jsonDecode(response.body) as Map;
+      final tag = body["tag"] as String?;
+
+      if (tag != "withdrawRequest") {
+        return null;
+      }
+
+      final minWithdrawable = body["minWithdrawable"] as int?;
+      final maxWithdrawable = body["maxWithdrawable"] as int?;
+
+      if ((minWithdrawable == null || minWithdrawable % 1000 != 0) ||
+          (maxWithdrawable == null || maxWithdrawable % 1000 != 0)) {
+        return null;
+      }
+
+      return LNURLWithdrawRequest(
+        callback: body["callback"] as String,
+        k1: body["k1"] as String,
+        description: body["defaultDescription"] as String,
+        minAmount: Money.fromInt(minWithdrawable ~/ 1000, CryptoCurrency.btcln),
+        maxAmount: Money.fromInt(maxWithdrawable ~/ 1000, CryptoCurrency.btcln),
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Future<bool> commitWithdrawRequest(LNURLWithdrawRequest request, String invoice) async {
+    try {
+      final url = Uri.parse(request.callback);
+      url.queryParameters["k1"] = request.k1;
+      url.queryParameters["pr"] = invoice;
+
+      final response = await ProxyWrapper().get(clearnetUri: url);
+
+      if (response.statusCode != 200) {
+        return false;
+      }
+
+      final body = jsonDecode(response.body) as Map;
+      final status = body["status"] as String?;
+
+      if (status == "OK") {
+        return true;
+      }
+
+      return false;
+    } catch (_) {
+      return false;
+    }
+  }
+
   static String encode(String url) {
     final raw = _convert(utf8.encode(url), 8, 5, true);
-    return const Bech32Codec().encode(Bech32('lnurl', raw), 999);
+    return const Bech32Codec().encode(Bech32("lnurl", raw), 999);
   }
 
   static Uri decode(String encodedUrl) {
@@ -114,9 +192,10 @@ class LNURL {
     if (_LUD17_PREFIXES.contains(decodedUri.scheme)) {
       /// If the non-bech32 LNURL is a Tor address, the port has to be http instead of https for the clearnet LNURL so check if the host ends with '.onion' or '.onion.'
       decodedUri = decodedUri.replace(
-          scheme: decodedUri.host.endsWith('onion') || decodedUri.host.endsWith('onion.')
-              ? 'http'
-              : 'https');
+        scheme: decodedUri.host.endsWith("onion") || decodedUri.host.endsWith("onion.")
+            ? "http"
+            : "https",
+      );
     } else {
       /// Try to parse the input as a lnUrl. Will throw an error if it fails.
       final lnUrl = _findLnUrl(encodedUrl);
@@ -129,12 +208,30 @@ class LNURL {
   }
 }
 
+class LNURLWithdrawRequest {
+  const LNURLWithdrawRequest({
+    required this.callback,
+    required this.k1,
+    required this.description,
+    required this.minAmount,
+    required this.maxAmount,
+  });
+
+  final String callback;
+  final String k1;
+  final String description;
+  final Money minAmount;
+  final Money maxAmount;
+}
+
 /// Parse and return a given lnurl string if it's valid. Will remove
 /// `lightning:` from the beginning of it if present.
 String _findLnUrl(String input) {
-  final res = RegExp(r',*?((lnurl)([0-9]+[a-z0-9]+))').allMatches(input.toLowerCase());
+  final res = RegExp(r",*?((lnurl)([0-9]+[a-z0-9]+))").allMatches(input.toLowerCase());
 
-  if (res.length != 1) throw ArgumentError('Not a valid lnurl string');
+  if (res.length != 1) {
+    throw ArgumentError("Not a valid lnurl string");
+  }
   return res.first.group(0)!;
 }
 
@@ -156,10 +253,16 @@ List<int> _convert(List<int> data, int inBits, int outBits, bool pad) {
   }
 
   if (pad) {
-    if (bits > 0) result.add((value << (outBits - bits)) & maxV);
+    if (bits > 0) {
+      result.add((value << (outBits - bits)) & maxV);
+    }
   } else {
-    if (bits >= inBits) throw Exception('[BECH32] Excess padding');
-    if ((value << (outBits - bits)) & maxV > 0) throw Exception('[BECH32] Non-zero padding');
+    if (bits >= inBits) {
+      throw Exception("[BECH32] Excess padding");
+    }
+    if ((value << (outBits - bits)) & maxV > 0) {
+      throw Exception("[BECH32] Non-zero padding");
+    }
   }
 
   return result;

cw_core/pubspec.lock

@@ -394,10 +394,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.18.0"
+    version: "1.17.0"
   mime:
     dependency: transitive
     description:
@@ -738,10 +738,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
+      sha256: "8161c84903fd860b26bfdefb7963b3f0b68fee7adea0f59ef805ecca346f0c7a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.11"
+    version: "0.7.10"
   torch_dart:
     dependency: "direct main"
     description:
@@ -838,5 +838,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.10.0-0 <4.0.0"
+  dart: ">=3.9.0 <4.0.0"
   flutter: ">=3.27.0"