@node-lightning/wire/dist/serialize/address/ipv6StringToBuffer.js

Lightning Network Wire Protocol

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ipv6StringToBuffer = void 0;
const bufio_1 = require("@node-lightning/bufio");
/**
 * Converts an IPv6 address in string notation to the
 * byte representation.
 */
function ipv6StringToBuffer(host) {
    // replace start or end expansion with single part to retain correct
    // number of parts (8) that are used in the remainder of the logic.
    // ie: ::1:2:3:4:5:6:7 would split to ['','',1,2,3,4,5,6,7] and
    // result in overflows
    if (host.startsWith("::"))
        host = host.substr(1);
    else if (host.endsWith("::"))
        host = host.substr(0, host.length - 1);
    const parts = host.split(":");
    const writer = new bufio_1.BufferWriter(Buffer.alloc(16));
    const expandBy = 8 - parts.length;
    let needsExpansion = expandBy > 0;
    for (const part of parts) {
        if (needsExpansion && part === "") {
            const b = Buffer.alloc((expandBy + 1) * 2);
            writer.writeBytes(b);
            needsExpansion = false;
        }
        else {
            const b = Buffer.from(expandZeros(part), "hex");
            writer.writeBytes(b);
        }
    }
    return writer.toBuffer();
}
exports.ipv6StringToBuffer = ipv6StringToBuffer;
function expandZeros(part) {
    return part.padStart(4, "0");
}
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