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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | 1x 1x 1x 1x 1x 1x | import { Value } from '@node-dlc/bitcoin';
import { BufferReader, BufferWriter } from '@node-dlc/bufio';
import { MessageType } from '../MessageType';
import { readTlvs } from '../serialize/readTlvs';
import { IWireMessage } from './IWireMessage';
/**
* AcceptChannelMessage represents the accept_channel message defined in
* BOLT #2 of the Lightning Specification. This message is sent by the
* receiving node in reply to an open_channel message. This message
* signals agreement to open a channel with the using the values both
* message. After this message is received by the initiating peer, the
* initiating peer will create a funding transaction and send the
* funding_created message.
*/
export class AcceptChannelMessage implements IWireMessage {
public static type = MessageType.AcceptChannel;
/**
* Deserializes an accept_channel message
* @param buf
*/
public static deserialize(buf: Buffer): AcceptChannelMessage {
const instance = new AcceptChannelMessage();
const reader = new BufferReader(buf);
reader.readUInt16BE(); // read type
instance.temporaryChannelId = reader.readBytes(32);
instance.dustLimitSatoshis = Value.fromSats(reader.readUInt64BE());
instance.maxHtlcValueInFlightMsat = Value.fromMilliSats(
reader.readUInt64BE(),
);
instance.channelReserveSatoshis = Value.fromSats(reader.readUInt64BE());
instance.htlcMinimumMsat = Value.fromMilliSats(reader.readUInt64BE());
instance.minimumDepth = reader.readUInt32BE();
instance.toSelfDelay = reader.readUInt16BE();
instance.maxAcceptedHtlcs = reader.readUInt16BE();
instance.fundingPubKey = reader.readBytes(33);
instance.revocationBasePoint = reader.readBytes(33);
instance.paymentBasePoint = reader.readBytes(33);
instance.delayedPaymentBasePoint = reader.readBytes(33);
instance.htlcBasePoint = reader.readBytes(33);
instance.firstPerCommitmentPoint = reader.readBytes(33);
// Parse the TLVs
readTlvs(reader, (type: bigint, valueReader: BufferReader) => {
switch (type) {
case BigInt(0): {
instance.upfrontShutdownScript = valueReader.readBytes();
return true;
}
default:
return false;
}
});
return instance;
}
/**
* The type for accept_channel message. accept_channel = 33
*/
public type = AcceptChannelMessage.type;
/**
* A unique and temporary identifier used during the channel creation
* process. This value is a placeholder for the channel_id that is
* created from the funding transaction that can be used after the
* funding_created message creates this transaction and the
* counterparty uses the channel_id in the funding_signed message.
*/
public temporaryChannelId: Buffer;
/**
* Indicates the value in satoshis under which outputs should not
* be created for this node's commitment transaction or HTLC
* transactions. This setting indicates the reality that small
* transaction outputs are considered non-standard by the network and
* will not be propagated.
*/
public dustLimitSatoshis: Value;
/**
* Indicates the minimum amount that the counterparty is supposed to
* keep as direct payment. This value must be equal or greater than
* dust_limit_satoshis and SHOULD be 1% of the total value of the
* channel. This value ensures that there is always value at stake
* for a node to lose if it broadcasts an outdated commitment
* transaction. Initially this value may not be met but as a channel
* is used and the value is met, the reserve must be maintained.
*/
public channelReserveSatoshis: Value;
/**
* Specifies the number of blocks the accepting party considers
* reasonable to avoid double-spending of the funding transaction.
* Once the funding transaction has reached this depth,
* funding_locked messages will be sent by each peer to activate the
* channel.
*/
public minimumDepth: number;
/**
* Indicates the number of blocks the remote node must use to delay
* retrieval of its to_local outputs. This value is used as input
* to OP_CSV to create a relative timelock on RSMCs used in the
* to_local output of the commitment transaction and the HTLC
* transaction outputs. This allows us to use a penalty transaction
* is there is a breach.
*/
public toSelfDelay: number;
/**
* The minimum value in millisatoshi of an HTLC that we are willing
* to accept.
*/
public htlcMinimumMsat: Value;
/**
* The maximum value in millisatoshi of outstanding HTLCs we will
* allow. This value allows us to limit our overall exposure to
* HTLCs.
*/
public maxHtlcValueInFlightMsat: Value;
/**
* The maximum number of outstanding HTLCs that we will allow. This
* limits our exposure to a finite amount of HTLCs. This value must
* be less than 483 as more than this will cause issues with the
* commitment_signed message.
*/
public maxAcceptedHtlcs: number;
/**
* The public key used in the 2-of-2 multisig script of the funding
* transaction output. This value must a 33-byte compressed SEC
* encoded public key for secp256k1.
*/
public fundingPubKey: Buffer;
/**
* The revocation basepoint is used to derive a blinded
* per-commitment revocation public key. Revocation public keys
* are used in a remote node's version of the commitment
* transactions and HTLC transactions and allow us the ability to
* sweep funds if they broadcast a prior state transaction.
*/
public revocationBasePoint: Buffer;
/**
* The payment basepoint is used to derive a per-commitment payment
* public key.
*/
public paymentBasePoint: Buffer;
/**
* The delayed payment basepoint is used to derive a per-commitment
* payment public key that is sequence delayed. It is used in
* in our local commitment transaction as well as the outputs of
* HTLC transactions.
*/
public delayedPaymentBasePoint: Buffer;
/**
* The HTLC basepoint is used to derive a per-commitment
* public key used in HTLC outputs of the commitment transaction.
*/
public htlcBasePoint: Buffer;
/**
* This is the first per-commitment point to be used for the first
* commitment transaction. This point will be used by the remote
* node to construct the public keys used when constructing and
* signing our version of the commitment transaction. This point
* will eventually be revoked and a we will send a new
* commitment point.
*/
public firstPerCommitmentPoint: Buffer;
/**
* When option_upfront_shutdown_script is negotiated during init
* message exchange, this property will commit to using the provided
* scriptPubKey during a mutual close. This value will be used
* instead of the scriptPubKey provided during shutdown which
* ensures that this scriptPubKey is used on close even if our node
* is compromised.
*/
public upfrontShutdownScript: Buffer;
/**
* Serializes the accept_channel message into a Buffer
*/
public serialize(): Buffer {
const writer = new BufferWriter();
writer.writeUInt16BE(this.type);
writer.writeBytes(this.temporaryChannelId);
writer.writeUInt64BE(this.dustLimitSatoshis.sats);
writer.writeUInt64BE(this.maxHtlcValueInFlightMsat.msats);
writer.writeUInt64BE(this.channelReserveSatoshis.sats);
writer.writeUInt64BE(this.htlcMinimumMsat.msats);
writer.writeUInt32BE(this.minimumDepth);
writer.writeUInt16BE(this.toSelfDelay);
writer.writeUInt16BE(this.maxAcceptedHtlcs);
writer.writeBytes(this.fundingPubKey);
writer.writeBytes(this.revocationBasePoint);
writer.writeBytes(this.paymentBasePoint);
writer.writeBytes(this.delayedPaymentBasePoint);
writer.writeBytes(this.htlcBasePoint);
writer.writeBytes(this.firstPerCommitmentPoint);
// upfront_shutdown_script TLV
if (this.upfrontShutdownScript) {
writer.writeBigSize(0);
writer.writeBigSize(this.upfrontShutdownScript.length);
writer.writeBytes(this.upfrontShutdownScript);
}
return writer.toBuffer();
}
}
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