@multiformats/multiaddr/dist/src/filter/multiaddr-filter.js

multiaddr implementation (binary + string representation of network addresses)

import { convertToIpNet } from '../convert.js';
import { multiaddr } from '../index.js';
/**
 * A utility class to determine if a Multiaddr contains another
 * multiaddr.
 *
 * This can be used with ipcidr ranges to determine if a given
 * multiaddr is in a ipcidr range.
 *
 * @example
 *
 * ```js
 * import { multiaddr, MultiaddrFilter } from '@multiformats/multiaddr'
 *
 * const range = multiaddr('/ip4/192.168.10.10/ipcidr/24')
 * const filter = new MultiaddrFilter(range)
 *
 * const input = multiaddr('/ip4/192.168.10.2/udp/60')
 * console.info(filter.contains(input)) // true
 * ```
 */
export class MultiaddrFilter {
    multiaddr;
    netmask;
    constructor(input) {
        this.multiaddr = multiaddr(input);
        this.netmask = convertToIpNet(this.multiaddr);
    }
    contains(input) {
        if (input == null) {
            return false;
        }
        const m = multiaddr(input);
        let ip;
        for (const [code, value] of m.stringTuples()) {
            if (code === 4 || code === 41) {
                ip = value;
                break;
            }
        }
        if (ip === undefined) {
            return false;
        }
        return this.netmask.contains(ip);
    }
}
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