packages/runtime/src/network/proxy-env.ts

import { buildProxyUrl, bracketIfIpv6 } from './proxy-parser.js';
import type { ProxySettings } from '@maka/core';

export function getEnvWithProxy(base: NodeJS.ProcessEnv, proxy: ProxySettings): NodeJS.ProcessEnv {
  const out: NodeJS.ProcessEnv = { ...base };
  if (!proxy.enabled || !proxy.host || !proxy.port) return out;

  const url = proxy.type === 'socks5' ? buildSocks5Url(proxy) : buildProxyUrl(proxy);
  setIfAbsent(out, 'HTTP_PROXY', url);
  setIfAbsent(out, 'HTTPS_PROXY', url);
  setIfAbsent(out, 'http_proxy', url);
  setIfAbsent(out, 'https_proxy', url);

  const noProxy = buildNoProxy(proxy.bypassList);
  if (noProxy) {
    setIfAbsent(out, 'NO_PROXY', noProxy);
    setIfAbsent(out, 'no_proxy', noProxy);
  }
  return out;
}

export function buildNoProxy(bypassList: readonly string[]): string {
  return bypassList
    .map((entry) => entry.trim().toLowerCase())
    .filter(Boolean)
    .join(',');
}

function buildSocks5Url(proxy: ProxySettings): string {
  const auth = proxy.username
    ? `${encodeURIComponent(proxy.username)}${
        proxy.password ? `:${encodeURIComponent(proxy.password)}` : ''
      }@`
    : '';
  return `socks5://${auth}${bracketIfIpv6(proxy.host)}:${proxy.port}`;
}

function setIfAbsent(env: NodeJS.ProcessEnv, key: string, value: string): void {
  if (env[key] === undefined || env[key] === '') env[key] = value;
}