Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 1x 1x 1x 1x 1x 1x 1x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 495x 253x 253x 253x 253x 510x 510x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x 254x | import { BufferReader, BufferWriter } from "@node-lightning/bufio";
import { BitField } from "@node-lightning/core";
import * as crypto from "@node-lightning/crypto";
import { deserializeAddress } from "../deserialize/address/deserializeAddress";
import { Address } from "../domain/Address";
import { NodeFeatureFlags } from "../flags/NodeFeatureFlags";
import { MessageType } from "../MessageType";
import { serializeAddress } from "../serialize/address/serializeAddress";
import { IWireMessage } from "./IWireMessage";
/**
* This gossip message allows a node to indicate extra data associated with it,
* in addition to its public key. To avoid trivial denial of service attacks,
* nodes not associated with an already known channel are ignored.
*/
export class NodeAnnouncementMessage implements IWireMessage {
public static deserialize(payload: Buffer) {
const instance = new NodeAnnouncementMessage();
const reader = new BufferReader(payload);
reader.readUInt16BE(); // read off type
instance.signature = reader.readBytes(64);
const flen = reader.readUInt16BE();
instance.features = BitField.fromBuffer(reader.readBytes(flen));
instance.timestamp = reader.readUInt32BE();
instance.nodeId = reader.readBytes(33);
instance.rgbColor = reader.readBytes(3);
instance.alias = reader.readBytes(32);
instance.addresses = [];
const addrlen = reader.readUInt16BE(); // number of bytes
const startPos = reader.position;
while (reader.position < startPos + addrlen) {
const type = reader.readUInt8();
const address = deserializeAddress(type, reader);
instance.addresses.push(address);
}
return instance;
}
/**
* Message hashing is after the first 66 bytes of the message
* and excludes the type and signature. It performs a double
* sha-256 hash of the remaining bytes.
*/
public static hash(msg: NodeAnnouncementMessage): Buffer {
const bytes = msg.serialize().slice(66); // type + signature
return crypto.hash256(bytes);
}
/**
* Verifies the message signature
*/
public static verifySignatures(msg: NodeAnnouncementMessage): boolean {
const hash = NodeAnnouncementMessage.hash(msg);
return crypto.verifySig(hash, msg.signature, msg.nodeId);
}
/**
* Type 257
*/
public type: MessageType = MessageType.NodeAnnouncement;
/**
* Signature of the announcement message by the node's public key
* returned as a 64-byte Buffer.
*/
public signature: Buffer;
public features: BitField<NodeFeatureFlags>;
public timestamp: number;
/**
* Compressed public key of the node that is a 33-byte
* buffer.
*/
public nodeId: Buffer;
/**
* Color of the node returned as a 3-byte Buffer.
*/
public rgbColor: Buffer;
/**
* Alias of the node returned as a 32-byte Buffer.
*/
public alias: Buffer;
/**
* Addresses that the node allow public network connections
* on. The type indicates how the address is encoded. Addresses
* are in order of connectivity preference. Currently
* supported addresses formats are IPv4, IPv6, Tor2 and Tor3
*/
public addresses: Address[] = [];
public serialize() {
const featuresBuffer = this.features.toBuffer();
const featuresLen = featuresBuffer.length;
// serialize addresses into buffers so we can obtain the length
const addressBuffers = [];
for (const address of this.addresses) {
addressBuffers.push(serializeAddress(address));
}
// obtain total address length
// eslint-disable-next-line
const addressBytes: number = addressBuffers.map(b => b.length).reduce((sum, val) => sum + val, 0); // prettier-ignore
const len =
2 + // type
64 + // signature
2 + // flen
featuresLen + // features length
4 + // timestamp
33 + // node_id
3 + // rgb_color
32 + // alias
2 + // addresses
addressBytes; // cumulative addr bytes
const writer = new BufferWriter(Buffer.alloc(len));
writer.writeUInt16BE(this.type);
writer.writeBytes(this.signature);
writer.writeUInt16BE(featuresLen);
Iif (featuresLen > 0) writer.writeBytes(featuresBuffer);
writer.writeUInt32BE(this.timestamp);
writer.writeBytes(this.nodeId);
writer.writeBytes(this.rgbColor);
writer.writeBytes(this.alias);
writer.writeUInt16BE(addressBytes);
for (const addressBuffer of addressBuffers) {
writer.writeBytes(addressBuffer);
}
return writer.toBuffer();
}
}
|