geekai/server/server.go

package server

import (
	"embed"
	"encoding/json"
	"fmt"
	"github.com/gin-contrib/sessions"
	"github.com/gin-contrib/sessions/cookie"
	"github.com/gin-gonic/gin"
	"io/fs"
	"log"
	"net/http"
	"net/url"
	logger2 "openai/logger"
	"openai/types"
	"openai/utils"
	"os"
	"path/filepath"
	"strings"
)

var logger = logger2.GetLogger()

type StaticFile struct {
	embedFS embed.FS
	path    string
}

func (s StaticFile) Open(name string) (fs.File, error) {
	filename := filepath.Join(s.path, strings.TrimLeft(name, "/"))
	file, err := s.embedFS.Open(filename)
	return file, err
}

type Server struct {
	Config     *types.Config
	ConfigPath string
	Client     *http.Client
	History    map[string][]types.Message

	WsSession map[string]string // 关闭 Websocket 会话
}

func NewServer(configPath string) (*Server, error) {
	// load service configs
	config, err := types.LoadConfig(configPath)
	if err != nil {
		return nil, err
	}

	uri := url.URL{}
	proxy, _ := uri.Parse(config.ProxyURL)
	client := &http.Client{
		Transport: &http.Transport{
			Proxy: http.ProxyURL(proxy),
		},
	}
	return &Server{
		Config:     config,
		Client:     client,
		ConfigPath: configPath,
		History:    make(map[string][]types.Message, 16),
		WsSession:  make(map[string]string),
	}, nil
}

func (s *Server) Run(webRoot embed.FS, path string) {
	gin.SetMode(gin.DebugMode)
	engine := gin.Default()
	engine.Use(sessionMiddleware(s.Config))
	engine.Use(corsMiddleware())
	engine.Use(AuthorizeMiddleware(s))

	engine.GET("/hello", Hello)
	engine.POST("/api/session/get", s.GetSessionHandle)
	engine.POST("/api/login", s.LoginHandle)
	engine.Any("/api/chat", s.ChatHandle)
	engine.POST("/api/config/set", s.ConfigSetHandle)

	// process front-end web static files
	engine.StaticFS("/chat", http.FS(StaticFile{
		embedFS: webRoot,
		path:    path,
	}))

	logger.Infof("http://%s", s.Config.Listen)
	err := engine.Run(s.Config.Listen)

	if err != nil {
		logger.Error("Fail to start server:", err.Error())
		os.Exit(1)
	}

}

func sessionMiddleware(config *types.Config) gin.HandlerFunc {
	// encrypt the cookie
	store := cookie.NewStore([]byte(config.Session.SecretKey))
	store.Options(sessions.Options{
		Path:     config.Session.Path,
		Domain:   config.Session.Domain,
		MaxAge:   config.Session.MaxAge,
		Secure:   config.Session.Secure,
		HttpOnly: config.Session.HttpOnly,
		SameSite: config.Session.SameSite,
	})
	return sessions.Sessions(config.Session.Name, store)
}

// 跨域中间件设置
func corsMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method
		origin := c.Request.Header.Get("Origin")
		if origin != "" {
			// 设置允许的请求源
			c.Writer.Header().Set("Access-Control-Allow-Origin", origin)
			c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
			//允许跨域设置可以返回其他子段，可以自定义字段
			c.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, Content-Type, ChatGPT-Token")
			// 允许浏览器（客户端）可以解析的头部 （重要）
			c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers")
			//设置缓存时间
			c.Header("Access-Control-Max-Age", "172800")
			//允许客户端传递校验信息比如 cookie (重要)
			c.Header("Access-Control-Allow-Credentials", "true")
		}

		if method == http.MethodOptions {
			c.JSON(http.StatusOK, "ok!")
		}

		defer func() {
			if err := recover(); err != nil {
				log.Printf("Panic info is: %v", err)
			}
		}()

		c.Next()
	}
}

// AuthorizeMiddleware 用户授权验证
func AuthorizeMiddleware(s *Server) gin.HandlerFunc {
	return func(c *gin.Context) {
		if !s.Config.EnableAuth || c.Request.URL.Path == "/api/login" || c.Request.URL.Path == "/api/config/set" {
			c.Next()
			return
		}

		tokenName := c.Query("token")
		if tokenName == "" {
			tokenName = c.GetHeader(types.TokenName)
		}
		// TODO: 会话过期设置
		if addr, ok := s.WsSession[tokenName]; ok && addr == c.ClientIP() {
			session := sessions.Default(c)
			user := session.Get(tokenName)
			if user != nil {
				c.Set(types.SessionKey, user)
			}
			c.Next()
		} else {
			c.Abort()
			c.JSON(http.StatusOK, types.BizVo{
				Code:    types.NotAuthorized,
				Message: "Not Authorized",
			})
		}
	}
}

func (s *Server) GetSessionHandle(c *gin.Context) {
	session := sessions.Default(c)
	c.JSON(http.StatusOK, types.BizVo{Code: types.Success, Data: session.Get(types.TokenName)})
}

func (s *Server) LoginHandle(c *gin.Context) {
	var data map[string]string
	err := json.NewDecoder(c.Request.Body).Decode(&data)
	if err != nil {
		c.JSON(http.StatusOK, types.BizVo{Code: types.Failed, Message: types.ErrorMsg})
		return
	}
	token := data["token"]
	if !utils.ContainsItem(s.Config.Tokens, token) {
		c.JSON(http.StatusOK, types.BizVo{Code: types.Failed, Message: "Invalid token"})
		return
	}

	sessionId := utils.RandString(42)
	session := sessions.Default(c)
	session.Set(sessionId, token)
	err = session.Save()
	if err != nil {
		logger.Error("Error for save session: ", err)
	}
	// 记录客户端 IP 地址
	s.WsSession[sessionId] = c.ClientIP()
	c.JSON(http.StatusOK, types.BizVo{Code: types.Success, Data: sessionId})
}

func Hello(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{"code": 0, "message": fmt.Sprintf("HELLO, ChatGPT !!!")})
}