mirror of
https://github.com/LLM-Red-Team/kimi-free-api.git
synced 2025-04-20 13:19:16 +08:00
622 lines
19 KiB
TypeScript
622 lines
19 KiB
TypeScript
import { PassThrough } from "stream";
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import path from 'path';
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import _ from 'lodash';
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import mime from 'mime';
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import axios, { AxiosResponse } from 'axios';
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import APIException from "@/lib/exceptions/APIException.ts";
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import EX from "@/api/consts/exceptions.ts";
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import { createParser } from 'eventsource-parser'
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import logger from '@/lib/logger.ts';
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import util from '@/lib/util.ts';
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// 模型名称
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const MODEL_NAME = 'kimi';
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// access_token有效期
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const ACCESS_TOKEN_EXPIRES = 300;
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// 伪装headers
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const FAKE_HEADERS = {
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'Accept': '*/*',
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'Accept-Encoding': 'gzip, deflate, br, zstd',
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'Accept-Language': 'zh-CN,zh;q=0.9',
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'Origin': 'https://kimi.moonshot.cn',
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'Cookie': util.generateCookie(),
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'R-Timezone': 'Asia/Shanghai',
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'Sec-Ch-Ua': '"Chromium";v="122", "Not(A:Brand";v="24", "Google Chrome";v="122"',
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'Sec-Ch-Ua-Mobile': '?0',
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'Sec-Ch-Ua-Platform': '"Windows"',
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'Sec-Fetch-Dest': 'empty',
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'Sec-Fetch-Mode': 'cors',
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'Sec-Fetch-Site': 'same-origin',
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'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36'
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};
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// 文件最大大小
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const FILE_MAX_SIZE = 100 * 1024 * 1024;
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// access_token映射
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const accessTokenMap = new Map();
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// access_token请求队列映射
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const accessTokenRequestQueueMap: Record<string, Function[]> = {};
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/**
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* 请求access_token
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*
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* 使用refresh_token去刷新获得access_token
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*
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function requestToken(refreshToken: string) {
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if (accessTokenRequestQueueMap[refreshToken])
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return new Promise(resolve => accessTokenRequestQueueMap[refreshToken].push(resolve));
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accessTokenRequestQueueMap[refreshToken] = [];
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logger.info(`Refresh token: ${refreshToken}`);
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const result = await (async () => {
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const result = await axios.get('https://kimi.moonshot.cn/api/auth/token/refresh', {
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headers: {
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Authorization: `Bearer ${refreshToken}`,
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Referer: 'https://kimi.moonshot.cn',
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...FAKE_HEADERS
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},
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timeout: 15000,
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validateStatus: () => true
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});
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const {
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access_token,
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refresh_token
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} = checkResult(result, refreshToken);
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return {
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accessToken: access_token,
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refreshToken: refresh_token,
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refreshTime: util.unixTimestamp() + ACCESS_TOKEN_EXPIRES
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}
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})()
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.then(result => {
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if(accessTokenRequestQueueMap[refreshToken]) {
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accessTokenRequestQueueMap[refreshToken].forEach(resolve => resolve(result));
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delete accessTokenRequestQueueMap[refreshToken];
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}
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logger.success(`Refresh successful`);
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return result;
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})
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.catch(err => {
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if(accessTokenRequestQueueMap[refreshToken]) {
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accessTokenRequestQueueMap[refreshToken].forEach(resolve => resolve(err));
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delete accessTokenRequestQueueMap[refreshToken];
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}
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return err;
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});
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if(_.isError(result))
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throw result;
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return result;
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}
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/**
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* 获取缓存中的access_token
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*
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* 避免短时间大量刷新token，未加锁，如果有并发要求还需加锁
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*
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function acquireToken(refreshToken: string): Promise<string> {
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let result = accessTokenMap.get(refreshToken);
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if (!result) {
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result = await requestToken(refreshToken);
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accessTokenMap.set(refreshToken, result);
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}
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if (util.unixTimestamp() > result.refreshTime)
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result = await requestToken(refreshToken);
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return result.accessToken;
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}
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/**
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* 创建会话
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*
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* 创建临时的会话用于对话补全
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*
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function createConversation(name: string, refreshToken: string) {
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const token = await acquireToken(refreshToken);
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const result = await axios.post('https://kimi.moonshot.cn/api/chat', {
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name,
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is_example: false
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}, {
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: 'https://kimi.moonshot.cn',
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...FAKE_HEADERS
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},
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timeout: 15000,
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validateStatus: () => true
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});
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const {
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id: convId
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} = checkResult(result, refreshToken);
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return convId;
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}
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/**
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* 移除会话
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*
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* 在对话流传输完毕后移除会话，避免创建的会话出现在用户的对话列表中
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*
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function removeConversation(convId: string, refreshToken: string) {
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const token = await acquireToken(refreshToken);
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const result = await axios.delete(`https://kimi.moonshot.cn/api/chat/${convId}`, {
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn/chat/${convId}`,
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...FAKE_HEADERS
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},
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timeout: 15000,
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validateStatus: () => true
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});
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checkResult(result, refreshToken);
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}
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/**
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* 同步对话补全
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*
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* @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
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* @param refreshToken 用于刷新access_token的refresh_token
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* @param useSearch 是否开启联网搜索
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*/
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async function createCompletion(messages: any[], refreshToken: string, useSearch = true) {
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logger.info(messages);
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// 提取引用文件URL并上传kimi获得引用的文件ID列表
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const refFileUrls = extractRefFileUrls(messages);
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const refs = refFileUrls.length ? await Promise.all(refFileUrls.map(fileUrl => uploadFile(fileUrl, refreshToken))) : [];
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// 创建会话
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const convId = await createConversation(`cmpl-${util.uuid(false)}`, refreshToken);
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// 请求流
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const token = await acquireToken(refreshToken);
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const result = await axios.post(`https://kimi.moonshot.cn/api/chat/${convId}/completion/stream`, {
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messages: messagesPrepare(messages),
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refs,
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use_search: useSearch
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}, {
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn/chat/${convId}`,
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...FAKE_HEADERS
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},
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// 120秒超时
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timeout: 120000,
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validateStatus: () => true,
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responseType: 'stream'
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});
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// 接收流为输出文本
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const answer = await receiveStream(convId, result.data);
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// 异步移除会话，如果消息不合规，此操作可能会抛出数据库错误异常，请忽略
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removeConversation(convId, refreshToken)
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.catch(err => console.error(err));
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return answer;
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}
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/**
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* 流式对话补全
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*
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* @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
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* @param refreshToken 用于刷新access_token的refresh_token
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* @param useSearch 是否开启联网搜索
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*/
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async function createCompletionStream(messages: any[], refreshToken: string, useSearch = true) {
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logger.info(messages);
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// 提取引用文件URL并上传kimi获得引用的文件ID列表
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const refFileUrls = extractRefFileUrls(messages);
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const refs = refFileUrls.length ? await Promise.all(refFileUrls.map(fileUrl => uploadFile(fileUrl, refreshToken))) : [];
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// 创建会话
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const convId = await createConversation(`cmpl-${util.uuid(false)}`, refreshToken);
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// 请求流
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const token = await acquireToken(refreshToken);
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const result = await axios.post(`https://kimi.moonshot.cn/api/chat/${convId}/completion/stream`, {
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messages: messagesPrepare(messages),
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refs,
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use_search: useSearch
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}, {
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// 120秒超时
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timeout: 120000,
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn/chat/${convId}`,
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...FAKE_HEADERS
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},
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validateStatus: () => true,
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responseType: 'stream'
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});
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// 创建转换流将消息格式转换为gpt兼容格式
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return createTransStream(convId, result.data, () => {
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// 流传输结束后异步移除会话，如果消息不合规，此操作可能会抛出数据库错误异常，请忽略
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removeConversation(convId, refreshToken)
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.catch(err => console.error(err));
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});
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}
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/**
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* 提取消息中引用的文件URL
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*
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* @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
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*/
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function extractRefFileUrls(messages: any[]) {
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return messages.reduce((urls, message) => {
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if (_.isArray(message.content)) {
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message.content.forEach(v => {
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if (!_.isObject(v) || !['file', 'image_url'].includes(v['type']))
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return;
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// kimi-free-api支持格式
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if (v['type'] == 'file' && _.isObject(v['file_url']) && _.isString(v['file_url']['url']))
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urls.push(v['file_url']['url']);
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// 兼容gpt-4-vision-preview API格式
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else if (v['type'] == 'image_url' && _.isObject(v['image_url']) && _.isString(v['image_url']['url']))
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urls.push(v['image_url']['url']);
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});
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}
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return urls;
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}, []);
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}
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/**
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* 消息预处理
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*
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* 由于接口只取第一条消息，此处会将多条消息合并为一条，实现多轮对话效果
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* user:旧消息1
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* assistant:旧消息2
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* user:新消息
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*
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* @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
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*/
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function messagesPrepare(messages: any[]) {
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const content = messages.reduce((content, message) => {
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if (_.isArray(message.content)) {
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return message.content.reduce((_content, v) => {
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if (!_.isObject(v) || v['type'] != 'text')
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return _content;
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return _content + (v['text'] || '');
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}, content);
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}
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return content += `${message.role || 'user'}:${wrapUrlsToTags(message.content)}\n`;
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}, '');
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return [
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{ role: 'user', content }
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]
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}
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/**
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* 将消息中的URL包装为HTML标签
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*
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* kimi网页版中会自动将url包装为url标签用于处理状态，此处也得模仿处理，否则无法成功解析
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*
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* @param content 消息内容
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*/
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function wrapUrlsToTags(content: string) {
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return content.replace(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/gi, url => `<url id="" type="url" status="" title="" wc="">${url}</url>`);
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}
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/**
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* 获取预签名的文件URL
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*
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* @param filename 文件名称
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function preSignUrl(filename: string, refreshToken: string) {
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const token = await acquireToken(refreshToken);
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const result = await axios.post('https://kimi.moonshot.cn/api/pre-sign-url', {
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action: 'file',
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name: filename
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}, {
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timeout: 15000,
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn`,
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...FAKE_HEADERS
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},
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validateStatus: () => true
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});
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return checkResult(result, refreshToken);
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}
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/**
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* 预检查文件URL有效性
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*
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* @param fileUrl 文件URL
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*/
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async function checkFileUrl(fileUrl: string) {
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if (util.isBASE64Data(fileUrl))
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return;
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const result = await axios.head(fileUrl, {
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timeout: 15000,
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validateStatus: () => true
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});
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if (result.status >= 400)
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throw new APIException(EX.API_FILE_URL_INVALID, `File ${fileUrl} is not valid: [${result.status}] ${result.statusText}`);
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// 检查文件大小
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if (result.headers && result.headers['content-length']) {
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const fileSize = parseInt(result.headers['content-length'], 10);
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if (fileSize > FILE_MAX_SIZE)
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throw new APIException(EX.API_FILE_EXECEEDS_SIZE, `File ${fileUrl} is not valid`);
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}
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}
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/**
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* 上传文件
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*
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* @param fileUrl 文件URL
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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async function uploadFile(fileUrl: string, refreshToken: string) {
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// 预检查远程文件URL可用性
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await checkFileUrl(fileUrl);
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let filename, fileData, mimeType;
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// 如果是BASE64数据则直接转换为Buffer
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if (util.isBASE64Data(fileUrl)) {
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mimeType = util.extractBASE64DataFormat(fileUrl);
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const ext = mime.getExtension(mimeType);
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filename = `${util.uuid()}.${ext}`;
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fileData = Buffer.from(util.removeBASE64DataHeader(fileUrl), 'base64');
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}
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// 下载文件到内存，如果您的服务器内存很小，建议考虑改造为流直传到下一个接口上，避免停留占用内存
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else {
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filename = path.basename(fileUrl);
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({ data: fileData } = await axios.get(fileUrl, {
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responseType: 'arraybuffer',
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// 100M限制
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maxContentLength: FILE_MAX_SIZE,
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// 60秒超时
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timeout: 60000
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}));
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}
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// 获取预签名文件URL
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const {
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url: uploadUrl,
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object_name: objectName
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} = await preSignUrl(filename, refreshToken);
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// 获取文件的MIME类型
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mimeType = mimeType || mime.getType(filename);
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// 上传文件到目标OSS
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const token = await acquireToken(refreshToken);
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let result = await axios.request({
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method: 'PUT',
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url: uploadUrl,
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data: fileData,
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// 100M限制
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maxBodyLength: FILE_MAX_SIZE,
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// 60秒超时
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timeout: 60000,
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headers: {
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'Content-Type': mimeType,
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn`,
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...FAKE_HEADERS
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},
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validateStatus: () => true
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});
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checkResult(result, refreshToken);
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// 获取文件上传结果
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result = await axios.post('https://kimi.moonshot.cn/api/file', {
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type: 'file',
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name: filename,
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object_name: objectName,
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timeout: 15000
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}, {
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn`,
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...FAKE_HEADERS
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}
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});
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const { id: fileId } = checkResult(result, refreshToken);
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// 处理文件转换
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result = await axios.post('https://kimi.moonshot.cn/api/file/parse_process', {
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ids: [fileId],
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timeout: 120000
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}, {
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headers: {
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Authorization: `Bearer ${token}`,
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Referer: `https://kimi.moonshot.cn`,
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...FAKE_HEADERS
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}
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});
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checkResult(result, refreshToken);
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return fileId;
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}
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/**
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* 检查请求结果
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*
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* @param result 结果
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* @param refreshToken 用于刷新access_token的refresh_token
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*/
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function checkResult(result: AxiosResponse, refreshToken: string) {
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if (result.status == 401) {
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accessTokenMap.delete(refreshToken);
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throw new APIException(EX.API_REQUEST_FAILED);
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}
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if (!result.data)
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return null;
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const { error_type, message } = result.data;
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if (!_.isString(error_type))
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return result.data;
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if (error_type == 'auth.token.invalid')
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accessTokenMap.delete(refreshToken);
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throw new APIException(EX.API_REQUEST_FAILED, `[请求kimi失败]: ${message}`);
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}
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/**
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* 从流接收完整的消息内容
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*
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* @param convId 会话ID
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* @param stream 消息流
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*/
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async function receiveStream(convId: string, stream: any) {
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return new Promise((resolve, reject) => {
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// 第一条消息初始化
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const data = {
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id: convId,
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model: MODEL_NAME,
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object: 'chat.completion',
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choices: [
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{ index: 0, message: { role: 'assistant', content: '' }, finish_reason: 'stop' }
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],
|
||
usage: { prompt_tokens: 0, completion_tokens: 0, total_tokens: 0 },
|
||
created: util.unixTimestamp()
|
||
};
|
||
let refContent = '';
|
||
const parser = createParser(event => {
|
||
try {
|
||
if (event.type !== "event") return;
|
||
// 解析JSON
|
||
const result = _.attempt(() => JSON.parse(event.data));
|
||
if (_.isError(result))
|
||
throw new Error(`Stream response invalid: ${event.data}`);
|
||
// 处理消息
|
||
if (result.event == 'cmpl') {
|
||
data.choices[0].message.content += result.text;
|
||
}
|
||
// 处理结束或错误
|
||
else if (result.event == 'all_done' || result.event == 'error') {
|
||
data.choices[0].message.content += (result.event == 'error' ? '\n[内容由于不合规被停止生成，我们换个话题吧]' : '') + (refContent ? `\n\n搜索结果来自：\n${refContent}` : '');
|
||
refContent = '';
|
||
resolve(data);
|
||
}
|
||
// 处理联网搜索
|
||
else if (result.event == 'search_plus' && result.msg && result.msg.type == 'get_res')
|
||
refContent += `${result.msg.title}(${result.msg.url})\n`;
|
||
// else
|
||
// logger.warn(result.event, result);
|
||
}
|
||
catch (err) {
|
||
logger.error(err);
|
||
reject(err);
|
||
}
|
||
});
|
||
// 将流数据喂给SSE转换器
|
||
stream.on("data", buffer => parser.feed(buffer.toString()));
|
||
stream.once("error", err => reject(err));
|
||
stream.once("close", () => resolve(data));
|
||
});
|
||
}
|
||
|
||
/**
|
||
* 创建转换流
|
||
*
|
||
* 将流格式转换为gpt兼容流格式
|
||
*
|
||
* @param convId 会话ID
|
||
* @param stream 消息流
|
||
* @param endCallback 传输结束回调
|
||
*/
|
||
function createTransStream(convId: string, stream: any, endCallback?: Function) {
|
||
// 消息创建时间
|
||
const created = util.unixTimestamp();
|
||
// 创建转换流
|
||
const transStream = new PassThrough();
|
||
let searchFlag = false;
|
||
!transStream.closed && transStream.write(`data: ${JSON.stringify({
|
||
id: convId,
|
||
model: MODEL_NAME,
|
||
object: 'chat.completion.chunk',
|
||
choices: [
|
||
{ index: 0, delta: { role: 'assistant', content: '' }, finish_reason: null }
|
||
],
|
||
created
|
||
})}\n\n`);
|
||
const parser = createParser(event => {
|
||
try {
|
||
if (event.type !== "event") return;
|
||
// 解析JSON
|
||
const result = _.attempt(() => JSON.parse(event.data));
|
||
if (_.isError(result))
|
||
throw new Error(`Stream response invalid: ${event.data}`);
|
||
// 处理消息
|
||
if (result.event == 'cmpl') {
|
||
const data = `data: ${JSON.stringify({
|
||
id: convId,
|
||
model: MODEL_NAME,
|
||
object: 'chat.completion.chunk',
|
||
choices: [
|
||
{ index: 0, delta: { content: (searchFlag ? '\n' : '') + result.text }, finish_reason: null }
|
||
],
|
||
created
|
||
})}\n\n`;
|
||
if (searchFlag)
|
||
searchFlag = false;
|
||
!transStream.closed && transStream.write(data);
|
||
}
|
||
// 处理结束或错误
|
||
else if (result.event == 'all_done' || result.event == 'error') {
|
||
const data = `data: ${JSON.stringify({
|
||
id: convId,
|
||
model: MODEL_NAME,
|
||
object: 'chat.completion.chunk',
|
||
choices: [
|
||
{
|
||
index: 0, delta: result.event == 'error' ? {
|
||
content: '\n[内容由于不合规被停止生成，我们换个话题吧]'
|
||
} : {}, finish_reason: 'stop'
|
||
}
|
||
],
|
||
usage: { prompt_tokens: 0, completion_tokens: 0, total_tokens: 0 },
|
||
created
|
||
})}\n\n`;
|
||
!transStream.closed && transStream.write(data);
|
||
!transStream.closed && transStream.end('data: [DONE]\n\n');
|
||
endCallback && endCallback();
|
||
}
|
||
// 处理联网搜索
|
||
else if (result.event == 'search_plus' && result.msg && result.msg.type == 'get_res') {
|
||
if (!searchFlag)
|
||
searchFlag = true;
|
||
const data = `data: ${JSON.stringify({
|
||
id: convId,
|
||
model: MODEL_NAME,
|
||
object: 'chat.completion.chunk',
|
||
choices: [
|
||
{
|
||
index: 0, delta: {
|
||
content: `检索 ${result.msg.title}(${result.msg.url}) ...\n`
|
||
}, finish_reason: null
|
||
}
|
||
],
|
||
created
|
||
})}\n\n`;
|
||
!transStream.closed && transStream.write(data);
|
||
}
|
||
// else
|
||
// logger.warn(result.event, result);
|
||
}
|
||
catch (err) {
|
||
logger.error(err);
|
||
!transStream.closed && transStream.end('\n\n');
|
||
}
|
||
});
|
||
// 将流数据喂给SSE转换器
|
||
stream.on("data", buffer => parser.feed(buffer.toString()));
|
||
stream.once("error", () => !transStream.closed && transStream.end('data: [DONE]\n\n'));
|
||
stream.once("close", () => !transStream.closed && transStream.end('data: [DONE]\n\n'));
|
||
return transStream;
|
||
}
|
||
|
||
export default {
|
||
createConversation,
|
||
createCompletion,
|
||
createCompletionStream
|
||
};
|