102 lines
2.4 KiB
TypeScript
102 lines
2.4 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import {isIPv4, isIPv6} from 'node:net';
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export type IpAddressFamily = 'ipv4' | 'ipv6';
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export interface ParsedIpAddress {
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raw: string;
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normalized: string;
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family: IpAddressFamily;
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}
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function stripIpv6Brackets(value: string): string {
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if (value.startsWith('[') && value.endsWith(']')) {
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return value.slice(1, -1);
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}
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return value;
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}
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function stripIpv6ZoneIdentifier(value: string): string {
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const zoneIndex = value.indexOf('%');
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if (zoneIndex === -1) {
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return value;
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}
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const addressPart = value.slice(0, zoneIndex);
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if (!addressPart.includes(':')) {
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return value;
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}
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return addressPart;
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}
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function normalizeIpv6(value: string): string {
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if (!isIPv6(value)) {
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return value;
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}
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try {
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const hostname = new URL(`http://[${value}]`).hostname;
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if (hostname.startsWith('[') && hostname.endsWith(']')) {
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return hostname.slice(1, -1);
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}
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return hostname;
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} catch {
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return value;
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}
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}
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function getAddressFamily(value: string): IpAddressFamily | null {
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if (isIPv4(value)) {
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return 'ipv4';
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}
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if (isIPv6(value)) {
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return 'ipv6';
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}
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return null;
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}
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export function normalizeIpString(value: string): string {
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const trimmed = value.trim();
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const withoutBrackets = stripIpv6Brackets(trimmed);
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const withoutZone = stripIpv6ZoneIdentifier(withoutBrackets);
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return normalizeIpv6(withoutZone);
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}
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export function parseIpAddress(value: string): ParsedIpAddress | null {
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const normalized = normalizeIpString(value);
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const family = getAddressFamily(normalized);
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if (!family) {
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return null;
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}
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return {
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raw: value,
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normalized,
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family,
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};
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}
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export function isValidIp(value: string): boolean {
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return parseIpAddress(value) !== null;
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}
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