bool TransactionFrame::checkSignature(AccountFrame& account, int32_t neededWeight) { vector<Signer> keyWeights; if (account.getAccount().thresholds[0]) keyWeights.push_back( Signer(account.getID(), account.getAccount().thresholds[0])); keyWeights.insert(keyWeights.end(), account.getAccount().signers.begin(), account.getAccount().signers.end()); Hash const& contentsHash = getContentsHash(); // calculate the weight of the signatures int totalWeight = 0; for (size_t i = 0; i < getEnvelope().signatures.size(); i++) { auto const& sig = getEnvelope().signatures[i]; for (auto it = keyWeights.begin(); it != keyWeights.end(); it++) { if ((std::memcmp(sig.hint.data(), (*it).pubKey.data(), sizeof(sig.hint)) == 0) && PublicKey::verifySig((*it).pubKey, sig.signature, contentsHash)) { mUsedSignatures[i] = true; totalWeight += (*it).weight; if (totalWeight >= neededWeight) return true; keyWeights.erase(it); // can't sign twice break; } } } return false; }
// work backward to determine how much they need to send to get the // specified amount of currency to the recipient bool PaymentOpFrame::sendNoCreate(AccountFrame& destination, LedgerDelta& delta, LedgerManager& ledgerManager) { Database& db = ledgerManager.getDatabase(); bool multi_mode = mPayment.path.size() != 0; if (multi_mode) { innerResult().code(PAYMENT_SUCCESS_MULTI); } else { innerResult().code(PAYMENT_SUCCESS); } // tracks the last amount that was traded int64_t curBReceived = mPayment.amount; Currency curB = mPayment.currency; // update balances, walks backwards // update last balance in the chain { if (curB.type() == CURRENCY_TYPE_NATIVE) { destination.getAccount().balance += curBReceived; destination.storeChange(delta, db); } else { TrustFrame destLine; if (!TrustFrame::loadTrustLine(destination.getID(), curB, destLine, db)) { innerResult().code(PAYMENT_NO_TRUST); return false; } if (!destLine.isAuthorized()) { innerResult().code(PAYMENT_NOT_AUTHORIZED); return false; } if (!destLine.addBalance(curBReceived)) { innerResult().code(PAYMENT_LINE_FULL); return false; } destLine.storeChange(delta, db); } if (multi_mode) { innerResult().multi().last = SimplePaymentResult(destination.getID(), curB, curBReceived); } } if (multi_mode) { // now, walk the path backwards for (int i = (int)mPayment.path.size() - 1; i >= 0; i--) { int64_t curASent, actualCurBReceived; Currency const& curA = mPayment.path[i]; OfferExchange oe(delta, ledgerManager); // curA -> curB OfferExchange::ConvertResult r = oe.convertWithOffers(curA, INT64_MAX, curASent, curB, curBReceived, actualCurBReceived, nullptr); switch (r) { case OfferExchange::eFilterStop: assert(false); // no filter -> should not happen break; case OfferExchange::eOK: if (curBReceived == actualCurBReceived) { break; } // fall through case OfferExchange::ePartial: innerResult().code(PAYMENT_TOO_FEW_OFFERS); return false; } assert(curBReceived == actualCurBReceived); curBReceived = curASent; // next round, we need to send enough curB = curA; // add offers that got taken on the way // insert in front to match the path's order auto& offers = innerResult().multi().offers; offers.insert(offers.begin(), oe.getOfferTrail().begin(), oe.getOfferTrail().end()); } } // last step: we've reached the first account in the chain, update its // balance int64_t curBSent; curBSent = curBReceived; if (curBSent > mPayment.sendMax) { // make sure not over the max innerResult().code(PAYMENT_OVER_SENDMAX); return false; } if (curB.type() == CURRENCY_TYPE_NATIVE) { int64_t minBalance = mSourceAccount->getMinimumBalance(ledgerManager); if (mSourceAccount->getAccount().balance < (minBalance + curBSent)) { // they don't have enough to send innerResult().code(PAYMENT_UNDERFUNDED); return false; } mSourceAccount->getAccount().balance -= curBSent; mSourceAccount->storeChange(delta, db); } else { AccountFrame issuer; if (!AccountFrame::loadAccount(curB.alphaNum().issuer, issuer, db)) { throw std::runtime_error("sendCredit Issuer not found"); } TrustFrame sourceLineFrame; if (!TrustFrame::loadTrustLine(getSourceID(), curB, sourceLineFrame, db)) { innerResult().code(PAYMENT_UNDERFUNDED); return false; } if (!sourceLineFrame.addBalance(-curBSent)) { innerResult().code(PAYMENT_UNDERFUNDED); return false; } sourceLineFrame.storeChange(delta, db); } return true; }