| 1 | import "package:cw_core/format_fixed.dart"; |
| 2 | |
| 3 | abstract class PaymentURI { |
| 4 | PaymentURI({required this.amount, required this.address}); |
| 5 | |
| 6 | final String amount; |
| 7 | final String address; |
| 8 | } |
| 9 | |
| 10 | class ExternalAddressURI extends PaymentURI { |
| 11 | ExternalAddressURI({required super.amount, required super.address}); |
| 12 | |
| 13 | @override |
| 14 | String toString() => address; |
| 15 | } |
| 16 | |
| 17 | class MoneroURI extends PaymentURI { |
| 18 | MoneroURI({required super.amount, required super.address}); |
| 19 | |
| 20 | @override |
| 21 | String toString() { |
| 22 | var base = "monero:$address"; |
| 23 | |
| 24 | if (amount.isNotEmpty) { |
| 25 | base += '?tx_amount=${amount.replaceAll(',', '.')}'; |
| 26 | } |
| 27 | |
| 28 | return base; |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | class HavenURI extends PaymentURI { |
| 33 | HavenURI({required super.amount, required super.address}); |
| 34 | |
| 35 | @override |
| 36 | String toString() { |
| 37 | var base = "haven:$address"; |
| 38 | |
| 39 | if (amount.isNotEmpty) { |
| 40 | base += '?tx_amount=${amount.replaceAll(',', '.')}'; |
| 41 | } |
| 42 | |
| 43 | return base; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | class BitcoinURI extends PaymentURI { |
| 48 | BitcoinURI({required super.amount, required super.address, this.pjUri = ""}); |
| 49 | |
| 50 | final String pjUri; |
| 51 | |
| 52 | @override |
| 53 | String toString() { |
| 54 | final qp = <String, String>{}; |
| 55 | |
| 56 | if (amount.isNotEmpty) { |
| 57 | qp["amount"] = amount.replaceAll(",", "."); |
| 58 | } |
| 59 | |
| 60 | if (pjUri.isNotEmpty && !address.startsWith("sp")) { |
| 61 | qp["pjos"] = "0"; |
| 62 | qp["pj"] = pjUri; |
| 63 | } |
| 64 | |
| 65 | return Uri(scheme: "bitcoin", path: address, queryParameters: qp).toString(); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | class LitecoinURI extends PaymentURI { |
| 70 | LitecoinURI({required super.amount, required super.address}); |
| 71 | |
| 72 | @override |
| 73 | String toString() { |
| 74 | var base = "litecoin:$address"; |
| 75 | |
| 76 | if (amount.isNotEmpty) { |
| 77 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 78 | } |
| 79 | |
| 80 | return base; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | class EthereumURI extends PaymentURI { |
| 85 | EthereumURI({required super.amount, required super.address}); |
| 86 | |
| 87 | @override |
| 88 | String toString() { |
| 89 | var base = "ethereum:$address"; |
| 90 | |
| 91 | if (amount.isNotEmpty) { |
| 92 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 93 | } |
| 94 | |
| 95 | return base; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | class BitcoinCashURI extends PaymentURI { |
| 100 | BitcoinCashURI({required super.amount, required super.address}); |
| 101 | |
| 102 | @override |
| 103 | String toString() { |
| 104 | var base = address; |
| 105 | |
| 106 | if (amount.isNotEmpty) { |
| 107 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 108 | } |
| 109 | |
| 110 | return base; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | class NanoURI extends PaymentURI { |
| 115 | NanoURI({required super.amount, required super.address}); |
| 116 | |
| 117 | @override |
| 118 | String toString() { |
| 119 | var base = "nano:$address"; |
| 120 | if (amount.isNotEmpty) { |
| 121 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 122 | } |
| 123 | |
| 124 | return base; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | class SolanaURI extends PaymentURI { |
| 129 | SolanaURI({required super.amount, required super.address, this.contractAddress}); |
| 130 | |
| 131 | final String? contractAddress; |
| 132 | |
| 133 | @override |
| 134 | String toString() { |
| 135 | var base = "solana:$address"; |
| 136 | final params = <String>[]; |
| 137 | |
| 138 | if (amount.isNotEmpty) { |
| 139 | params.add('amount=${amount.replaceAll(',', '.')}'); |
| 140 | } |
| 141 | if (contractAddress != null && contractAddress!.isNotEmpty) { |
| 142 | params.add("spl-token=$contractAddress"); |
| 143 | } |
| 144 | if (params.isNotEmpty) { |
| 145 | base += '?${params.join('&')}'; |
| 146 | } |
| 147 | |
| 148 | return base; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | class TronURI extends PaymentURI { |
| 153 | TronURI({required super.amount, required super.address, this.contractAddress}); |
| 154 | |
| 155 | final String? contractAddress; |
| 156 | |
| 157 | @override |
| 158 | String toString() { |
| 159 | var base = "tron:$address"; |
| 160 | final params = <String>[]; |
| 161 | |
| 162 | if (amount.isNotEmpty) { |
| 163 | params.add('amount=${amount.replaceAll(',', '.')}'); |
| 164 | } |
| 165 | if (contractAddress != null && contractAddress!.isNotEmpty) { |
| 166 | params.add("token=$contractAddress"); |
| 167 | } |
| 168 | if (params.isNotEmpty) { |
| 169 | base += '?${params.join('&')}'; |
| 170 | } |
| 171 | |
| 172 | return base; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | class WowneroURI extends PaymentURI { |
| 177 | WowneroURI({required super.amount, required super.address}); |
| 178 | |
| 179 | @override |
| 180 | String toString() { |
| 181 | var base = "wownero:$address"; |
| 182 | |
| 183 | if (amount.isNotEmpty) { |
| 184 | base += '?tx_amount=${amount.replaceAll(',', '.')}'; |
| 185 | } |
| 186 | |
| 187 | return base; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | class ZanoURI extends PaymentURI { |
| 192 | ZanoURI({required super.amount, required super.address}); |
| 193 | |
| 194 | @override |
| 195 | String toString() { |
| 196 | var base = "zano:$address"; |
| 197 | |
| 198 | if (amount.isNotEmpty) { |
| 199 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 200 | } |
| 201 | |
| 202 | return base; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | class DecredURI extends PaymentURI { |
| 207 | DecredURI({required super.amount, required super.address}); |
| 208 | |
| 209 | @override |
| 210 | String toString() { |
| 211 | var base = "decred:$address"; |
| 212 | |
| 213 | if (amount.isNotEmpty) { |
| 214 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 215 | } |
| 216 | |
| 217 | return base; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | class DogeURI extends PaymentURI { |
| 222 | DogeURI({required super.amount, required super.address}); |
| 223 | |
| 224 | @override |
| 225 | String toString() { |
| 226 | var base = "doge:$address"; |
| 227 | |
| 228 | if (amount.isNotEmpty) { |
| 229 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 230 | } |
| 231 | |
| 232 | return base; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | class ZcashURI extends PaymentURI { |
| 237 | ZcashURI({required super.amount, required super.address}); |
| 238 | |
| 239 | @override |
| 240 | String toString() { |
| 241 | var base = "zcash:$address"; |
| 242 | |
| 243 | if (amount.isNotEmpty) { |
| 244 | base += '?amount=${amount.replaceAll(',', '.')}'; |
| 245 | } |
| 246 | |
| 247 | return base; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | class ERC681URI extends PaymentURI { |
| 252 | ERC681URI({ |
| 253 | required this.chainId, |
| 254 | required super.address, |
| 255 | required super.amount, |
| 256 | required this.contractAddress, |
| 257 | this.tokenDecimals = 18, |
| 258 | this.rawTokenAmount, |
| 259 | }); |
| 260 | |
| 261 | factory ERC681URI.fromUri(Uri uri) { |
| 262 | final (isContract, targetAddress) = _getTargetAddress(uri.path); |
| 263 | final chainId = _getChainID(uri.path); |
| 264 | |
| 265 | final address = isContract ? uri.queryParameters["address"] ?? "" : targetAddress; |
| 266 | |
| 267 | var formatedAmount = ""; |
| 268 | String? rawTokenAmount; |
| 269 | |
| 270 | if (isContract) { |
| 271 | formatedAmount = uri.queryParameters["amount"] ?? ""; |
| 272 | final uint256Param = uri.queryParameters["uint256"]; |
| 273 | if (uint256Param != null) { |
| 274 | final raw = uint256Param.replaceAll(",", ".").trim(); |
| 275 | if (!_scientificPattern.hasMatch(raw) && raw.contains(".")) { |
| 276 | if (formatedAmount.isEmpty) { |
| 277 | formatedAmount = raw; |
| 278 | } |
| 279 | } else { |
| 280 | rawTokenAmount = _normalizeToIntegerWei(raw); |
| 281 | } |
| 282 | } |
| 283 | } else { |
| 284 | final valueParam = uri.queryParameters["value"]; |
| 285 | if (valueParam != null) { |
| 286 | final normalized = BigInt.tryParse(_normalizeToIntegerWei(valueParam)); |
| 287 | formatedAmount = normalized != null ? formatFixed(normalized, 18) : ""; |
| 288 | } else { |
| 289 | formatedAmount = uri.queryParameters["amount"] ?? ""; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | return ERC681URI( |
| 294 | chainId: chainId, |
| 295 | address: address, |
| 296 | amount: formatedAmount, |
| 297 | contractAddress: isContract ? targetAddress : null, |
| 298 | rawTokenAmount: rawTokenAmount, |
| 299 | ); |
| 300 | } |
| 301 | |
| 302 | final int chainId; |
| 303 | final String? contractAddress; |
| 304 | final int tokenDecimals; |
| 305 | final String? rawTokenAmount; |
| 306 | |
| 307 | static final RegExp _scientificPattern = RegExp(r"^[+-]?(\d+\.?\d*|\d*\.?\d+)[eE][+-]?\d+$"); |
| 308 | |
| 309 | @override |
| 310 | String toString() { |
| 311 | var uri = "ethereum:"; |
| 312 | |
| 313 | final targetAddress = contractAddress ?? address; |
| 314 | uri += targetAddress; |
| 315 | |
| 316 | uri += "@$chainId"; |
| 317 | |
| 318 | if (contractAddress != null) { |
| 319 | uri += "/transfer"; |
| 320 | } |
| 321 | |
| 322 | final params = <String, String>{}; |
| 323 | |
| 324 | if (contractAddress != null) { |
| 325 | params["address"] = address; |
| 326 | // only emit an atomic uint256 when it is unambiguous, either stored raw or 18 decimals, |
| 327 | // old app versions divide any uint256 by 1e18 so other tokens rely on the amount param |
| 328 | final uint256 = rawTokenAmount ?? |
| 329 | (tokenDecimals == 18 && amount.isNotEmpty |
| 330 | ? _expandDecimal(amount.replaceAll(",", "."), 18) |
| 331 | : null); |
| 332 | if (uint256 != null && uint256.isNotEmpty) { |
| 333 | params["uint256"] = uint256; |
| 334 | } |
| 335 | if (amount.isNotEmpty) { |
| 336 | params["amount"] = amount.replaceAll(",", "."); |
| 337 | } |
| 338 | } else { |
| 339 | if (amount.isNotEmpty) { |
| 340 | params["value"] = _formatAmountForNative(amount); |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | if (params.isNotEmpty) { |
| 345 | uri += "?${params.entries.map((e) => "${e.key}=${e.value}").join("&")}"; |
| 346 | } |
| 347 | |
| 348 | return uri; |
| 349 | } |
| 350 | |
| 351 | /// Formats amount for native ETH payments (in wei using scientific notation) |
| 352 | String _formatAmountForNative(String amount) { |
| 353 | try { |
| 354 | // Convert decimal amount to double for scientific notation |
| 355 | final amountDouble = double.parse(amount.replaceAll(",", ".")); |
| 356 | |
| 357 | // Use scientific notation as recommended by ERC-681 |
| 358 | return "${amountDouble}e18"; |
| 359 | } catch (e) { |
| 360 | // Fallback to original amount if parsing fails |
| 361 | return amount.replaceAll(",", "."); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | static int _getChainID(String path) => |
| 366 | int.tryParse( |
| 367 | RegExp(r"@\d*").firstMatch(path)?.group(0)?.replaceAll("@", "") ?? "1", |
| 368 | ) ?? |
| 369 | 1; |
| 370 | |
| 371 | static (bool, String) _getTargetAddress(String path) { |
| 372 | // I saw in the schema (thanks Konsti) that EIP-681 allows an optional "pay-" prefix before the target address, so adding a check for it here |
| 373 | final cleaned = path.startsWith("pay-") ? path.substring(4) : path; |
| 374 | final match = RegExp(r"^(0x)?[0-9a-f]{40}", caseSensitive: false).firstMatch(cleaned); |
| 375 | final targetAddress = match?.group(0) ?? cleaned.split("@").first.split("/").first; |
| 376 | return (cleaned.contains("/"), targetAddress); |
| 377 | } |
| 378 | |
| 379 | /// Normalize an input amount into an integer wei string. |
| 380 | /// |
| 381 | /// Accepts the following forms: |
| 382 | /// - Integer string: "123000000000000000" → unchanged |
| 383 | /// - Scientific notation: "0.123e18", "1e6" → expanded to integer |
| 384 | /// - Decimal ETH: "0.123456" → shifted by 18 decimals |
| 385 | static String _normalizeToIntegerWei(String input) { |
| 386 | final raw = input.replaceAll(",", ".").trim(); |
| 387 | |
| 388 | // First we check if it's already a plain integer (basically just a number with no dot, no exponent) |
| 389 | try { |
| 390 | final isPlainInteger = RegExp(r"^[+-]?\d+$").hasMatch(raw) && |
| 391 | !raw.contains(".") && |
| 392 | !raw.toLowerCase().contains("e"); |
| 393 | if (isPlainInteger) { |
| 394 | return raw.replaceFirst(RegExp(r"^\+"), ""); |
| 395 | } |
| 396 | |
| 397 | // Then we check if it's a scientific notation |
| 398 | if (_scientificPattern.hasMatch(raw)) { |
| 399 | final mantissaStr = raw.toLowerCase().split("e")[0]; |
| 400 | final exp = int.parse(raw.toLowerCase().split("e")[1]); |
| 401 | return _expandDecimal(mantissaStr, exp); |
| 402 | } |
| 403 | |
| 404 | // Lastly, we check if it's a fixed decimal ETH amount, here we shift by 18 to get wei for the amount |
| 405 | if (raw.contains(".")) { |
| 406 | return _expandDecimal(raw, 18); |
| 407 | } |
| 408 | return raw; |
| 409 | } catch (e) { |
| 410 | return raw; |
| 411 | } |
| 412 | |
| 413 | // If none of these checks work, we return the raw input |
| 414 | } |
| 415 | |
| 416 | /// Expands a decimal string by shifting the decimal point `expShift` places |
| 417 | /// to the right and returns an integer string (digits only, optional leading minus). |
| 418 | /// Examples: |
| 419 | /// _expandDecimal('0.123456', 18) -> '123456000000000000' |
| 420 | /// _expandDecimal('1.2', 3) -> '1200' |
| 421 | static String _expandDecimal(String decimalStr, int expShift) { |
| 422 | var s = decimalStr.trim(); |
| 423 | var sign = ""; |
| 424 | if (s.startsWith("-") || s.startsWith("+")) { |
| 425 | sign = s[0] == "-" ? "-" : ""; |
| 426 | s = s.substring(1); |
| 427 | } |
| 428 | |
| 429 | // First we split the integer and fractional parts |
| 430 | final parts = s.split("."); |
| 431 | final intPart = parts[0].isEmpty ? "0" : parts[0]; |
| 432 | final fracPart = parts.length > 1 ? parts[1] : ""; |
| 433 | final digits = (intPart + fracPart).replaceFirst(RegExp(r"^0+"), ""); |
| 434 | final fracLen = fracPart.length; |
| 435 | |
| 436 | // Then we calculate the effective shift = desired shift minus existing fractional digits |
| 437 | final shift = expShift - fracLen; |
| 438 | if (shift >= 0) { |
| 439 | final head = digits.isEmpty ? "0" : digits; |
| 440 | final zeros = List.filled(shift, "0").join(); |
| 441 | final res = head + zeros; |
| 442 | return sign + (res.isEmpty ? "0" : res); |
| 443 | } else { |
| 444 | // Need to insert a decimal point within digits; return integer by truncating |
| 445 | final cut = digits.length + shift; |
| 446 | if (cut <= 0) { |
| 447 | return "0"; |
| 448 | } |
| 449 | final res = digits.substring(0, cut); |
| 450 | return sign + (res.isEmpty ? "0" : res); |
| 451 | } |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | class LightningPaymentRequest extends PaymentURI { |
| 456 | LightningPaymentRequest({ |
| 457 | required super.address, |
| 458 | required super.amount, |
| 459 | required this.lnURL, |
| 460 | this.bolt11Invoice, |
| 461 | }); |
| 462 | |
| 463 | final String lnURL; |
| 464 | final String? bolt11Invoice; |
| 465 | |
| 466 | @override |
| 467 | String toString() => bolt11Invoice ?? "lightning:$lnURL"; |
| 468 | } |