基于 EdgeOne Pages 函数构建免费的地理位置 API

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export function onRequest(context) {
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   const { request } = context;
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   // 提取 EdgeOne 提供的元数据
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   const eo = request.eo || {};
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   const geo = eo.geo || {};
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   // 根据调试信息，IP 存储在 eo.clientIp 中
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   const ip = eo.clientIp ||
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              request.headers.get('eo-client-ip') ||
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              request.headers.get('x-real-ip') ||
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              request.headers.get('cf-connecting-ip') ||
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              request.headers.get('x-forwarded-for')?.split(',')[0].trim() ||
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              '127.0.0.1';
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   const responseData = {
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     ip: ip,
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     asn: geo.asn || null,
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     countryName: geo.countryName || 'unknown',
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     countryCodeAlpha2: geo.countryCodeAlpha2 || 'unknown',
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     countryCodeAlpha3: geo.countryCodeAlpha3 || 'unknown',
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     countryCodeNumeric: geo.countryCodeNumeric || 'unknown',
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     regionName: geo.regionName || 'unknown',
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     regionCode: geo.regionCode || 'unknown',
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     cityName: geo.cityName || 'unknown',
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     latitude: geo.latitude || null,
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     longitude: geo.longitude || null,
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     cisp: geo.cisp || 'unknown'
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   };
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   // 处理 OPTIONS 请求（CORS 预检）
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   if (request.method === 'OPTIONS') {
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     return new Response(null, {
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       status: 204,
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       headers: {
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         'Access-Control-Allow-Origin': '*',
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         'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
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         'Access-Control-Allow-Headers': 'Content-Type, Authorization',
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         'Access-Control-Max-Age': '86400',
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       },
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     });
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   }
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   // 返回地理位置信息并设置 CORS 头部
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   return new Response(JSON.stringify(responseData), {
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     headers: {
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       'Content-Type': 'application/json;charset=UTF-8',
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       'Access-Control-Allow-Origin': '*',
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       'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
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       'Access-Control-Allow-Headers': 'Content-Type, Authorization',
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     },
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   });
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 }