Next.js 多域名站点地图生成策略：整合静态与动态内容

// next-sitemap.config.js
module.exports = {
  siteUrl: "http://localhost:3000", // 这是一个占位符，实际应为主要域名
  exclude: ['/server-sitemap.xml'], // 排除由SSR生成的sitemap
  generateRobotsTxt: true,
  robotsTxtOptions: {
    additionalSitemaps: [`http://localhost:3000/server-sitemap.xml`], // 指向SSR生成的sitemap
  },
  transform: async (_, path) => {
    return {
      loc: path,
      lastmod: new Date().toISOString(),
    }
  }
};

// pages/server-sitemap.xml.tsx
import { GetServerSideProps } from 'next';
import { getServerSideSitemap, ISitemapField } from 'next-sitemap';

// 假设这些类型和常量已定义
// type PageEntity = { generatedUrl: string; updatedAt: string; localizations?: { generatedUrl: string; locale: string }[] };
// const STRAPI_ENDPOINTS = { PAGES: 'pages' };
// const fetchAPI = async <T>(endpoint: string, options?: any) => { /* ... */ return [] as T; };
// const i18n = { locales: ['en', 'cs', 'de', 'ua', 'pl', 'de-AT'] }; // 你的所有语言环境
// const languageToDomains: Record<string, string> = {
//   'en': 'example.com',
//   'cs': 'example.cz',
//   'de': 'example.de',
//   'ua': 'example.ua',
//   'pl': 'example.pl',
//   'de-AT': 'example.at',
// };

// 辅助函数：根据语言环境和路径构建完整的URL
const buildLocalizedUrl = (locale: string, path: string) =>
  `https://${languageToDomains[locale]}${path}`;

export const getServerSideProps: GetServerSideProps = async (ctx) => {
  const allFields: ISitemapField[] = [];

  // 1. 定义和生成静态路由的Sitemap字段
  // 这些是存在于 /pages 目录下的，但需要多域名/多语言处理的页面
  const staticPageDefinitions = [
    {
      basePath: '/about', // 页面在所有语言中的概念性路径
      localizedPaths: {
        'en': '/about',
        'cs': '/o-nas',
        'de': '/ueber-uns',
        // ... 其他语言的路径
      },
      lastmod: new Date().toISOString(), // 静态页面的最后修改时间，可根据实际情况调整
    },
    {
      basePath: '/contact',
      localizedPaths: {
        'en': '/contact',
        'cs': '/kontakt',
        'de': '/kontakt',
        // ...
      },
      lastmod: new Date().toISOString(),
    },
    // ... 更多静态页面定义
  ];

  for (const pageDef of staticPageDefinitions) {
    for (const locale of i18n.locales) {
      const currentPath = pageDef.localizedPaths[locale];
      if (currentPath) {
        const alternateRefs = i18n.locales
          .filter(altLocale => altLocale !== locale && pageDef.localizedPaths[altLocale])
          .map(altLocale => ({
            href: buildLocalizedUrl(altLocale, pageDef.localizedPaths[altLocale]!),
            hreflang: altLocale,
          }));

        allFields.push({
          loc: buildLocalizedUrl(locale, currentPath),
          lastmod: pageDef.lastmod,
          alternateRefs: alternateRefs.length > 0 ? alternateRefs : undefined,
        });
      }
    }
  }

  // 2. 从CMS获取动态路由的Sitemap字段
  for (const locale of i18n.locales) {
    // 假设 fetchAPI 返回的 PageEntity 包含 generatedUrl 和 localizations
    const urls = await fetchAPI<PageEntity[]>(`/${STRAPI_ENDPOINTS.PAGES}`, { params: { locale, populate: "localizations" } });

    urls?.forEach(
      ({ generatedUrl, updatedAt, localizations }) => {
        const alternateRefs = localizations
          ?.filter(alt => alt.locale !== locale) // 排除当前语言
          .map(({ generatedUrl: altUrl, locale: altLocale }) => ({
            href: buildLocalizedUrl(altLocale, altUrl),
            hreflang: altLocale,
          }));

        allFields.push({
          loc: buildLocalizedUrl(locale, generatedUrl),
          lastmod: updatedAt,
          alternateRefs: alternateRefs?.length > 0 ? alternateRefs : undefined,
        });
      }
    );
  }

  // 3. 返回合并后的所有Sitemap字段
  return getServerSideSitemap(ctx, allFields);
};

// 默认导出以防止Next.js报错
export default () => {};

// 示例：languageToDomains.ts
export const languageToDomains: Record<string, string> = {
  'en': 'www.example.com',
  'cs': 'www.example.cz',
  'de': 'www.example.de',
  'ua': 'www.example.ua',
  'pl': 'www.example.pl',
  'de-AT': 'www.example.at',
  // ...根据你的实际情况添加
};