345 lines
10 KiB
JavaScript
345 lines
10 KiB
JavaScript
const express = require("express");
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const FormData = require("form-data");
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const docx = require("docx");
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const { v4: uuidv4 } = require("uuid");
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const { ProxyAgent } = require("proxy-agent");
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const agent = new ProxyAgent();
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const app = express();
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const axios = require("axios");
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const port = process.env.PORT || 8080;
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const validApiKey = process.env.PASSWORD;
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// import config.js
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try {
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var config = require("./config.js");
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} catch (e) {
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console.error(e);
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console.error("config.js missing or corrupted, create it from config.example.js and fill in the values.");
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process.exit(1);
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}
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// handle preflight request
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app.options("/v1/messages", (req, res) => {
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res.setHeader("Access-Control-Allow-Origin", "*");
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res.setHeader("Access-Control-Allow-Methods", "*");
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res.setHeader("Access-Control-Allow-Headers", "*");
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res.setHeader("Access-Control-Max-Age", "86400");
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res.status(200).end();
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});
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app.post("/v1/messages", apiKeyAuth, (req, res) => {
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req.rawBody = "";
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req.setEncoding("utf8");
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req.on("data", function (chunk) {
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req.rawBody += chunk;
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});
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req.on("end", async () => {
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res.setHeader("Content-Type", "text/event-stream;charset=utf-8");
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res.setHeader("Access-Control-Allow-Origin", "*");
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try {
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let jsonBody = JSON.parse(req.rawBody);
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if (jsonBody.stream == false) {
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res.send(
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JSON.stringify({
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id: uuidv4(),
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content: [
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{
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text: "Please turn on streaming.",
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},
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{
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id: "string",
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name: "string",
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input: {},
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},
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],
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model: "string",
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stop_reason: "end_turn",
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stop_sequence: "string",
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usage: {
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input_tokens: 0,
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output_tokens: 0,
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},
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})
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);
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} else if (jsonBody.stream == true) {
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// 计算用户消息长度
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let userMessage = [{ question: "", answer: "" }];
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let userQuery = "";
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let lastUpdate = true;
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if (jsonBody.system) {
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// 把系统消息加入messages的首条
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jsonBody.messages.unshift({ role: "system", content: jsonBody.system });
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}
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console.log("message length:" + jsonBody.messages.length);
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jsonBody.messages.forEach((msg) => {
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if (msg.role == "system" || msg.role == "user") {
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if (lastUpdate) {
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userMessage[userMessage.length - 1].question += msg.content + "\n";
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} else if (userMessage[userMessage.length - 1].question == "") {
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userMessage[userMessage.length - 1].question += msg.content + "\n";
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} else {
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userMessage.push({ question: msg.content + "\n", answer: "" });
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}
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lastUpdate = true;
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} else if (msg.role == "assistant") {
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if (!lastUpdate) {
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userMessage[userMessage.length - 1].answer += msg.content + "\n";
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} else if (userMessage[userMessage.length - 1].answer == "") {
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userMessage[userMessage.length - 1].answer += msg.content + "\n";
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} else {
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userMessage.push({ question: "", answer: msg.content + "\n" });
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}
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lastUpdate = false;
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}
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});
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userQuery = userMessage[userMessage.length - 1].question;
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var traceId=uuidv4();
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// decide which session to use randomly
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let sessionIndex = Math.floor(Math.random() * config.sessions.length);
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var session = config.sessions[sessionIndex];
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console.log("using session " + sessionIndex);
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var instance = axios.create({
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headers: {
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"User-Agent": session.user_agent,
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"Cookie": session.cookie,
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},
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httpsAgent: agent,
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});
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// 试算用户消息长度
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if(encodeURIComponent(JSON.stringify(userMessage)).length + encodeURIComponent(userQuery).length > 32000) {
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//太长了，需要上传
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// user message to plaintext
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let previousMessages = jsonBody.messages
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.map((msg) => {
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return msg.content
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})
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.join("\n\n");
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// 试算最新一条human消息长度
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if(encodeURIComponent(userQuery).length > 30000) userQuery = "Please view the document and reply.";
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userMessage = [];
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// GET https://you.com/api/get_nonce to get nonce
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let nonce = await instance("https://you.com/api/get_nonce").then((res) => res.data);
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if (!nonce) throw new Error("Failed to get nonce");
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// POST https://you.com/api/upload to upload user message
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const form_data = new FormData();
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var messageBuffer = await createDocx(previousMessages);
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form_data.append("file", messageBuffer, { filename: "messages.docx", contentType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document" });
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var uploadedFile = await instance
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.post("https://you.com/api/upload", form_data, {
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headers: {
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...form_data.getHeaders(),
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"X-Upload-Nonce": nonce,
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},
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})
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.then((res) => res.data.filename);
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if (!uploadedFile) throw new Error("Failed to upload messages");
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}
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let msgid = uuidv4();
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// send message start
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res.write(
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createEvent("message_start", {
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type: "message_start",
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message: {
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id: `${traceId}`,
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type: "message",
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role: "assistant",
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content: [],
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model: "claude-3-opus-20240229",
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stop_reason: null,
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stop_sequence: null,
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usage: { input_tokens: 8, output_tokens: 1 },
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},
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})
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);
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res.write(createEvent("content_block_start", { type: "content_block_start", index: 0, content_block: { type: "text", text: "" } }));
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res.write(createEvent("ping", { type: "ping" }));
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// proxy response
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var proxyReq = await instance
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.get("https://you.com/api/streamingSearch", {
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params: {
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page: "1",
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count: "10",
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safeSearch: "Off",
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q: userQuery.trim(),
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incognito: "true",
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chatId: traceId,
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traceId: `${traceId}|${msgid}|${new Date().toISOString()}`,
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conversationTurnId: msgid,
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selectedAiModel: process.env.AI_MODEL || "claude_3_opus",
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selectedChatMode: "custom",
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pastChatLength: userMessage.length,
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queryTraceId: traceId,
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use_personalization_extraction: "false",
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domain: "youchat",
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responseFilter: "WebPages,TimeZone,Computation,RelatedSearches",
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mkt: "zh-CN",
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userFiles: uploadedFile
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? JSON.stringify([
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{
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user_filename: "messages.docx",
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filename: uploadedFile,
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size: messageBuffer.length,
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},
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])
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: "",
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chat: JSON.stringify(userMessage),
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},
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headers: {
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accept: "text/event-stream",
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referer: "https://you.com/search?q=&fromSearchBar=true&tbm=youchat&chatMode=custom"
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},
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responseType: "stream",
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})
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.catch((e) => {
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if(e?.response?.data) {
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// print data
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e.response.data.on("data", (chunk) => {
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console.log(chunk.toString());
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}
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);
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}else{
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throw e;
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}
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});
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let cachedLine = "";
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const stream = proxyReq.data;
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stream.on("data", (chunk) => {
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// try to parse eventstream chunk
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chunk = chunk.toString();
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if (cachedLine) {
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chunk = cachedLine + chunk;
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cachedLine = "";
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}
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if (!chunk.endsWith("\n")) {
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const lines = chunk.split("\n");
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cachedLine = lines.pop();
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chunk = lines.join("\n");
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}
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try {
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if (chunk.indexOf("event: youChatToken\n") != -1) {
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chunk.split("\n").forEach((line) => {
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if (line.startsWith(`data: {"youChatToken"`)) {
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let data = line.substring(6);
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let json = JSON.parse(data);
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process.stdout.write(json.youChatToken);
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chunkJSON = JSON.stringify({
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type: "content_block_delta",
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index: 0,
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delta: { type: "text_delta", text: json.youChatToken },
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});
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res.write(createEvent("content_block_delta", chunkJSON));
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}
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});
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}else{
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console.log(chunk);
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}
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} catch (e) {
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console.log(e);
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}
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});
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res.on("close", function () {
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console.log(" > [Client closed]");
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if (stream && typeof stream.destroy === 'function') {
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stream.destroy();
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}
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});
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stream.on("end", () => {
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// send ending
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res.write(createEvent("content_block_stop", { type: "content_block_stop", index: 0 }));
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res.write(
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createEvent("message_delta", {
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type: "message_delta",
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delta: { stop_reason: "end_turn", stop_sequence: null },
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usage: { output_tokens: 12 },
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})
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);
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res.write(createEvent("message_stop", { type: "message_stop" }));
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res.end();
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});
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} else {
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throw new Error("Invalid request");
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}
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} catch (e) {
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console.log(e);
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res.write(JSON.stringify({ error: e.message }));
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res.end();
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return;
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}
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});
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});
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// handle other
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app.use((req, res, next) => {
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res.status(404).send("Not Found");
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});
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app.listen(port, () => {
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console.log(`YouChat proxy listening on port ${port}`);
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if (!validApiKey) {
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console.log(`Proxy is currently running with no authentication`)
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}
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});
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function apiKeyAuth(req, res, next) {
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const reqApiKey = req.header('x-api-key');
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if (validApiKey && (reqApiKey !== validApiKey)) {
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// If Environment variable PASSWORD is set AND x-api-key header is not equal to it, return 401
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const clientIpAddress = req.headers['x-forwarded-for'] || req.ip;
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console.log(`Receviced Request from IP ${clientIpAddress} but got invalid password.`);
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return res.status(401).json({error: 'Invalid Password'});
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}
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next();
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}
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// eventStream util
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function createEvent(event, data) {
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// if data is object, stringify it
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if (typeof data === "object") {
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data = JSON.stringify(data);
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}
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return `event: ${event}\ndata: ${data}\n\n`;
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}
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function createDocx(content) {
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var paragraphs = [];
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content.split("\n").forEach((line) => {
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paragraphs.push(new docx.Paragraph({
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children: [
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new docx.TextRun(line),
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],
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}));
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});
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var doc = new docx.Document({
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sections: [
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{
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properties: {},
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children:
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paragraphs
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,
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},
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],
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});
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return docx.Packer.toBuffer(doc).then((buffer) => buffer);
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}
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