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/**Welcome to Cloudflare Workers! This is your first worker. *
Run "npm run dev" in your terminal to start a development server
Open a browser tab at http://localhost:8787/ to see your worker in action
Run "npm run deploy" to publish your worker *Learn more at https://developers.cloudflare.com/workers/ */export default {async fetch(request, env) {// 处理预检请求if (request.method === 'OPTIONS') {return handleOptions(request);}const url = new URL(request.url);url.host = 'api.mistral.ai';let body;try {// 获取 body 数据并解析为 JSONbody = await request.json();} catch (error) {return new Response('Invalid JSON', { status: 400 });}// 定义支持字段列表const allowedFields = ['model', 'messages', 'temperature', 'topp', 'maxtokens', 'mintokens', 'stream', 'stop', 'randomseed','responseformat','tools','toolchoice','safe_prompt'];// 过滤 body 中不在支持字段列表中的字段const filteredBody = filterFields(body, allowedFields);const newBody = JSON.stringify(filteredBody);const modifiedRequest = new Request(url, {method: request.method,body: newBody,headers: request.headers});return fetch(modifiedRequest);}}// 过滤不支持参数function filterFields(obj, allowedFields) {let result = {};for (const key in obj) {if (allowedFields.includes(key)) {result[key] = obj[key];}}return result;}// 处理预检请求的函数function handleOptions(request) {const headers = {'Access-Control-Allow-Origin': '*', // 允许所有来源'Access-Control-Allow-Methods': 'GET, POST, OPTIONS', // 允许的方法'Access-Control-Allow-Headers': 'Content-Type, Authorization', // 允许的头部'Access-Control-Max-Age': '86400', // 预检请求的缓存时间（秒）};return new Response(null, {status: 204,headers: headers});}