搭建私有代理节点

私有代理节点部署在各种 serverless 环境，可以加速资源的下载进度。但由于目前节点代码并没有进行身份验证，所以请避免部署后的代理地址遭到泄露。如若发现节点流量异常，请销毁节点重新进行搭建(即更换代理地址)。

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const UA =
    "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.0.0 Safari/537.36";

const PRESETS = {
    mp: {
        Referer: "https://mp.weixin.qq.com",
    },
};


function error(msg, status = 400) {
    return new Response(msg, {
        status: status,
    });
}


/**
 * 解析请求
 */
async function parseRequest(req) {
    const origin = req.headers.get("origin") || '*';

    // 代理目标的请求参数
    let targetURL = '';
    let targetMethod = "GET";
    let targetBody = '';
    let targetHeaders = {};
    let preset = '';

    const method = req.method.toLowerCase();
    if (method === "get") {
        // GET
        // ?url=${encodeURIComponent(https://example.com?a=b)}&method=GET&headers=${encodeURIComponent(JSON.stringify(headers))}
        const {searchParams} = new URL(req.url);
        if (searchParams.has("url")) {
            targetURL = decodeURIComponent(searchParams.get("url"));
        }
        if (searchParams.has("method")) {
            targetMethod = searchParams.get("method");
        }
        if (searchParams.has("body")) {
            targetBody = decodeURIComponent(searchParams.get("body"));
        }
        if (searchParams.has("headers")) {
            try {
                targetHeaders = JSON.parse(
                    decodeURIComponent(searchParams.get("headers")),
                );
            } catch (_) {
                throw new Error("headers not valid");
            }
        }
        if (searchParams.has("preset")) {
            preset = decodeURIComponent(searchParams.get("preset"));
        }
    } else if (method === "post") {
        // POST
        /**
         * payload(json):
         * {
         *   url: 'https://example.com',
         *   method: 'PUT',
         *   body: 'a=1&b=2',
         *   headers: {
         *     Cookie: 'name=root'
         *   },
         *   preset: '',
         * }
         */
        const payload = await req.json();
        if (payload.url) {
            targetURL = payload.url;
        }
        if (payload.method) {
            targetMethod = payload.method;
        }
        if (payload.body) {
            targetBody = payload.body;
        }
        if (payload.headers) {
            targetHeaders = payload.headers;
        }
        if (payload.preset) {
            preset = payload.preset;
        }
    } else {
        throw new Error("Method not implemented");
    }

    if (!targetURL) {
        throw new Error("URL not found");
    }
    if (!/^https?:\/\//.test(targetURL)) {
        throw new Error("URL not valid");
    }
    if (targetMethod === "GET" && targetBody) {
        throw new Error("GET method can't has body");
    }
    if (Object.prototype.toString.call(targetHeaders) !== "[object Object]") {
        throw new Error("Headers not valid");
    }
    if (!targetHeaders["User-Agent"]) {
        targetHeaders["User-Agent"] = UA;
    }

    // 增加预设
    if (preset in PRESETS) {
        Object.assign(targetHeaders, PRESETS[preset]);
    }

    return {
        origin,
        targetURL,
        targetMethod,
        targetBody,
        targetHeaders,
    };
}

/**
 * 代理请求
 */
function wfetch(url, method, body, headers = {}) {
    return fetch(url, {
        method: method,
        body: body || undefined,
        headers: {
            ...headers,
        },
    });
}

export default {
    async fetch(request) {
        try {
            // 处理预检请求
            if (request.method === "OPTIONS") {
                return new Response(null, {
                    headers: {
                        "Access-Control-Allow-Origin": "*",
                        "Access-Control-Allow-Methods": "GET, POST",
                        "Access-Control-Allow-Headers": "Content-Type",
                        "Access-Control-Max-Age": "86400",
                    }
                });
            }

            const {
                origin,
                targetURL,
                targetMethod,
                targetBody,
                targetHeaders,
            } = await parseRequest(request);

            // 代理请求
            const response = await wfetch(
                targetURL,
                targetMethod,
                targetBody,
                targetHeaders,
            );

            return new Response(response.body, {
                headers: {
                    "Access-Control-Allow-Origin": origin,
                    "Content-Type": response.headers.get("Content-Type"),
                },
            });
        } catch (err) {
            return error(err.message);
        }
    }
}

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目前该节点代码可部署在以下平台：