279 lines
8 KiB
C++
279 lines
8 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "stripe/stripe_card_validator.h"
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#include <QtCore/QDate>
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namespace Stripe {
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namespace {
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constexpr auto kMinCvcLength = 3;
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struct BinRange {
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QString low;
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QString high;
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int length = 0;
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CardBrand brand = CardBrand::Unknown;
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};
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[[nodiscard]] const std::vector<BinRange> &AllRanges() {
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static auto kResult = std::vector<BinRange>{
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// Unknown
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{ "", "", 19, CardBrand::Unknown },
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// American Express
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{ "34", "34", 15, CardBrand::Amex },
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{ "37", "37", 15, CardBrand::Amex },
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// Diners Club
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{ "30", "30", 16, CardBrand::DinersClub },
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{ "36", "36", 14, CardBrand::DinersClub },
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{ "38", "39", 16, CardBrand::DinersClub },
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// Discover
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{ "60", "60", 16, CardBrand::Discover },
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{ "64", "65", 16, CardBrand::Discover },
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// JCB
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{ "35", "35", 16, CardBrand::JCB },
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// Mastercard
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{ "50", "59", 16, CardBrand::MasterCard },
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{ "22", "27", 16, CardBrand::MasterCard },
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{ "67", "67", 16, CardBrand::MasterCard }, // Maestro
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// UnionPay
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{ "62", "62", 16, CardBrand::UnionPay },
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{ "81", "81", 16, CardBrand::UnionPay },
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// Visa
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{ "40", "49", 16, CardBrand::Visa },
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{ "413600", "413600", 13, CardBrand::Visa },
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{ "444509", "444509", 13, CardBrand::Visa },
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{ "444509", "444509", 13, CardBrand::Visa },
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{ "444550", "444550", 13, CardBrand::Visa },
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{ "450603", "450603", 13, CardBrand::Visa },
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{ "450617", "450617", 13, CardBrand::Visa },
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{ "450628", "450629", 13, CardBrand::Visa },
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{ "450636", "450636", 13, CardBrand::Visa },
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{ "450640", "450641", 13, CardBrand::Visa },
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{ "450662", "450662", 13, CardBrand::Visa },
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{ "463100", "463100", 13, CardBrand::Visa },
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{ "476142", "476142", 13, CardBrand::Visa },
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{ "476143", "476143", 13, CardBrand::Visa },
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{ "492901", "492902", 13, CardBrand::Visa },
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{ "492920", "492920", 13, CardBrand::Visa },
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{ "492923", "492923", 13, CardBrand::Visa },
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{ "492928", "492930", 13, CardBrand::Visa },
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{ "492937", "492937", 13, CardBrand::Visa },
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{ "492939", "492939", 13, CardBrand::Visa },
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{ "492960", "492960", 13, CardBrand::Visa },
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};
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return kResult;
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}
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[[nodiscard]] bool BinRangeMatchesNumber(
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const BinRange &range,
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const QString &sanitized) {
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const auto minWithLow = std::min(sanitized.size(), range.low.size());
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if (sanitized.midRef(0, minWithLow).toInt()
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< range.low.midRef(0, minWithLow).toInt()) {
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return false;
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}
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const auto minWithHigh = std::min(sanitized.size(), range.high.size());
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if (sanitized.midRef(0, minWithHigh).toInt()
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> range.high.midRef(0, minWithHigh).toInt()) {
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return false;
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}
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return true;
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}
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[[nodiscard]] bool IsNumeric(const QString &value) {
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return QRegularExpression("^[0-9]*$").match(value).hasMatch();
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}
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[[nodiscard]] QString RemoveWhitespaces(QString value) {
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return value.replace(QRegularExpression("\\s"), QString());
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}
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[[nodiscard]] std::vector<BinRange> BinRangesForNumber(
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const QString &sanitized) {
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const auto &all = AllRanges();
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auto result = std::vector<BinRange>();
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result.reserve(all.size());
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for (const auto &range : all) {
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if (BinRangeMatchesNumber(range, sanitized)) {
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result.push_back(range);
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}
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}
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return result;
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}
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[[nodiscard]] BinRange MostSpecificBinRangeForNumber(
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const QString &sanitized) {
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auto possible = BinRangesForNumber(sanitized);
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const auto compare = [&](const BinRange &a, const BinRange &b) {
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if (sanitized.isEmpty()) {
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const auto aUnknown = (a.brand == CardBrand::Unknown);
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const auto bUnknown = (b.brand == CardBrand::Unknown);
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if (aUnknown && !bUnknown) {
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return true;
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} else if (!aUnknown && bUnknown) {
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return false;
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}
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}
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return a.low.size() < b.low.size();
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};
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std::sort(begin(possible), end(possible), compare);
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return possible.back();
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}
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[[nodiscard]] int MaxCvcLengthForBranch(CardBrand brand) {
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switch (brand) {
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case CardBrand::Amex:
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case CardBrand::Unknown:
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return 4;
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default:
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return 3;
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}
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}
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[[nodiscard]] std::vector<CardBrand> PossibleBrandsForNumber(
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const QString &sanitized) {
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const auto ranges = BinRangesForNumber(sanitized);
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auto result = std::vector<CardBrand>();
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for (const auto &range : ranges) {
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const auto brand = range.brand;
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if (brand == CardBrand::Unknown
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|| (std::find(begin(result), end(result), brand)
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!= end(result))) {
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continue;
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}
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result.push_back(brand);
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}
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return result;
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}
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[[nodiscard]] CardBrand BrandForNumber(const QString &number) {
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const auto sanitized = RemoveWhitespaces(number);
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if (!IsNumeric(sanitized)) {
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return CardBrand::Unknown;
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}
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const auto possible = PossibleBrandsForNumber(sanitized);
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return (possible.size() == 1) ? possible.front() : CardBrand::Unknown;
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}
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[[nodiscard]] bool IsValidLuhn(const QString &sanitized) {
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auto odd = true;
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auto sum = 0;
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for (auto i = sanitized.end(); i != sanitized.begin();) {
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--i;
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auto digit = int(i->unicode() - '0');
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odd = !odd;
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if (odd) {
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digit *= 2;
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}
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if (digit > 9) {
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digit -= 9;
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}
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sum += digit;
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}
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return (sum % 10) == 0;
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}
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} // namespace
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CardValidationResult ValidateCard(const QString &number) {
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const auto sanitized = RemoveWhitespaces(number);
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if (!IsNumeric(sanitized)) {
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return { .state = ValidationState::Invalid };
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} else if (sanitized.isEmpty()) {
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return { .state = ValidationState::Incomplete };
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}
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const auto range = MostSpecificBinRangeForNumber(sanitized);
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const auto brand = range.brand;
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if (sanitized.size() > range.length) {
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return { .state = ValidationState::Invalid, .brand = brand };
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} else if (sanitized.size() < range.length) {
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return { .state = ValidationState::Incomplete, .brand = brand };
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} else if (!IsValidLuhn(sanitized)) {
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return { .state = ValidationState::Invalid, .brand = brand };
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}
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return {
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.state = ValidationState::Valid,
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.brand = brand,
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.finished = true,
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};
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}
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ExpireDateValidationResult ValidateExpireDate(const QString &date) {
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const auto sanitized = RemoveWhitespaces(date).replace('/', QString());
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if (!IsNumeric(sanitized)) {
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return { ValidationState::Invalid };
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} else if (sanitized.size() < 2) {
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return { ValidationState::Incomplete };
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}
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const auto normalized = (sanitized[0] > '1' ? "0" : "") + sanitized;
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const auto month = normalized.mid(0, 2).toInt();
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if (month < 1 || month > 12) {
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return { ValidationState::Invalid };
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} else if (normalized.size() < 4) {
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return { ValidationState::Incomplete };
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} else if (normalized.size() > 4) {
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return { ValidationState::Invalid };
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}
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const auto year = 2000 + normalized.mid(2).toInt();
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const auto currentDate = QDate::currentDate();
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const auto currentMonth = currentDate.month();
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const auto currentYear = currentDate.year();
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if (year < currentYear) {
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return { ValidationState::Invalid };
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} else if (year == currentYear && month < currentMonth) {
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return { ValidationState::Invalid };
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}
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return { ValidationState::Valid, true };
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}
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ValidationState ValidateParsedExpireDate(
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quint32 month,
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quint32 year) {
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if ((year / 100) != 20) {
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return ValidationState::Invalid;
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}
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return ValidateExpireDate(
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QString("%1%2"
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).arg(month, 2, 10, QChar('0')
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).arg(year % 100, 2, 10, QChar('0'))
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).state;
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}
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CvcValidationResult ValidateCvc(
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const QString &number,
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const QString &cvc) {
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if (!IsNumeric(cvc)) {
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return { ValidationState::Invalid };
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} else if (cvc.size() < kMinCvcLength) {
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return { ValidationState::Incomplete };
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}
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const auto maxLength = MaxCvcLengthForBranch(BrandForNumber(number));
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if (cvc.size() > maxLength) {
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return { ValidationState::Invalid };
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}
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return { ValidationState::Valid, (cvc.size() == maxLength) };
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}
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std::vector<int> CardNumberFormat(const QString &number) {
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static const auto kDefault = std::vector{ 4, 4, 4, 4 };
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const auto sanitized = RemoveWhitespaces(number);
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if (!IsNumeric(sanitized)) {
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return kDefault;
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}
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const auto range = MostSpecificBinRangeForNumber(sanitized);
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if (range.brand == CardBrand::DinersClub && range.length == 14) {
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return { 4, 6, 4 };
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} else if (range.brand == CardBrand::Amex) {
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return { 4, 6, 5 };
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}
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return kDefault;
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}
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} // namespace Stripe
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