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304 lines
8.3 KiB
304 lines
8.3 KiB
package auth
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import (
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"context"
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"crypto/rand"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/youruser/base/internal/svc"
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"github.com/youruser/base/internal/util/jwt"
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"github.com/youruser/base/model"
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"github.com/zeromicro/go-zero/core/logx"
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)
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// casdoorHttpClient 用于与 Casdoor 通信的 HTTP 客户端（带超时）
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var casdoorHttpClient = &http.Client{Timeout: 10 * time.Second}
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type SSOLogic struct {
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logx.Logger
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ctx context.Context
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svcCtx *svc.ServiceContext
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}
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func NewSSOLogic(ctx context.Context, svcCtx *svc.ServiceContext) *SSOLogic {
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return &SSOLogic{
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Logger: logx.WithContext(ctx),
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ctx: ctx,
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svcCtx: svcCtx,
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}
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}
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// GetLoginUrl 生成 Casdoor SSO 登录链接
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func (l *SSOLogic) GetLoginUrl() (map[string]string, error) {
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c := l.svcCtx.Config.Casdoor
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state, err := generateState()
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if err != nil {
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return nil, fmt.Errorf("生成 state 失败: %v", err)
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}
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loginUrl := fmt.Sprintf("%s/login/oauth/authorize?client_id=%s&response_type=code&redirect_uri=%s&scope=read&state=%s",
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c.Endpoint,
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url.QueryEscape(c.ClientId),
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url.QueryEscape(c.RedirectUrl),
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url.QueryEscape(state),
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)
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return map[string]string{
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"login_url": loginUrl,
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}, nil
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}
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// casdoorTokenResponse Casdoor token 响应
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type casdoorTokenResponse struct {
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AccessToken string `json:"access_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int `json:"expires_in"`
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Scope string `json:"scope"`
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}
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// casdoorUserInfo Casdoor 用户信息
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type casdoorUserInfo struct {
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Sub string `json:"sub"`
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Name string `json:"name"`
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PreferredUsername string `json:"preferred_username"`
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Email string `json:"email"`
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Phone string `json:"phone"`
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Avatar string `json:"avatar"`
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}
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// HandleCallback 处理 SSO 回调
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func (l *SSOLogic) HandleCallback(code, state string) (string, error) {
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if code == "" {
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return "", fmt.Errorf("缺少授权码")
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}
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c := l.svcCtx.Config.Casdoor
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// 1. 用 code 换取 access_token
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accessToken, err := l.exchangeToken(code)
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if err != nil {
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l.Errorf("SSO token 交换失败: %v", err)
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return "", fmt.Errorf("token 交换失败: %v", err)
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}
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// 2. 获取用户信息
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userInfo, err := l.getUserInfo(accessToken)
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if err != nil {
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l.Errorf("SSO 获取用户信息失败: %v", err)
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return "", fmt.Errorf("获取用户信息失败: %v", err)
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}
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// 3. 查找或创建本地用户
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casdoorId := userInfo.Sub
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if casdoorId == "" {
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casdoorId = userInfo.Name
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}
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// 从 Casdoor 信息中提取用户名和邮箱
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username := userInfo.PreferredUsername
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if username == "" {
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username = userInfo.Name
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}
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email := userInfo.Email
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if email == "" {
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email = username + "@sso.local"
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}
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localUser, err := model.FindOneByCasdoorId(l.ctx, l.svcCtx.DB, casdoorId)
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if err != nil {
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if err == model.ErrNotFound {
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// 用户不存在，尝试通过邮箱关联已有本地用户
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existingUser, findErr := model.FindOneByEmail(l.ctx, l.svcCtx.DB, email)
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if findErr == nil {
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existingUser.CasdoorId = casdoorId
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existingUser.UserType = "casdoor"
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if updateErr := model.Update(l.ctx, l.svcCtx.DB, existingUser); updateErr != nil {
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return "", fmt.Errorf("关联用户失败: %v", updateErr)
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}
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localUser = existingUser
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l.Infof("SSO 关联已有用户: userId=%d, casdoorId=%s", existingUser.Id, casdoorId)
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} else {
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// 创建新用户
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newUser := &model.User{
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Username: username,
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Email: email,
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Password: "SSO_NO_PASSWORD", // SSO 用户不使用密码登录
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Phone: userInfo.Phone,
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CasdoorId: casdoorId,
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UserType: "casdoor",
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Role: model.RoleUser,
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Source: model.SourceCasdoor,
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Status: 1,
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}
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_, insertErr := model.Insert(l.ctx, l.svcCtx.DB, newUser)
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if insertErr != nil {
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l.Errorf("SSO 创建用户失败: %v", insertErr)
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return "", fmt.Errorf("创建用户失败: %v", insertErr)
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}
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localUser = newUser
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l.Infof("SSO 新用户创建成功: username=%s, casdoorId=%s", username, casdoorId)
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}
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} else {
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return "", fmt.Errorf("查询用户失败: %v", err)
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}
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} else {
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// 已有用户，同步更新 Casdoor 端的最新信息
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updated := false
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if username != "" && localUser.Username != username {
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localUser.Username = username
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updated = true
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}
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if email != "" && localUser.Email != email {
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localUser.Email = email
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updated = true
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}
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if userInfo.Phone != "" && localUser.Phone != userInfo.Phone {
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localUser.Phone = userInfo.Phone
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updated = true
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}
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if updated {
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if updateErr := model.Update(l.ctx, l.svcCtx.DB, localUser); updateErr != nil {
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l.Errorf("SSO 同步用户信息失败: %v", updateErr)
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}
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}
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}
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// 4. 生成本地 JWT Token
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token, err := jwt.GenerateToken(localUser.Id, localUser.Username, localUser.Role)
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if err != nil {
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return "", fmt.Errorf("生成 Token 失败: %v", err)
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}
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l.Infof("SSO 登录成功: userId=%d, username=%s", localUser.Id, localUser.Username)
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// 5. 构建前端回调 URL
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redirectUrl := fmt.Sprintf("%s/sso/callback?token=%s",
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c.FrontendUrl,
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url.QueryEscape(token),
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)
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return redirectUrl, nil
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}
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// exchangeToken 用授权码换取 access_token
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func (l *SSOLogic) exchangeToken(code string) (string, error) {
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c := l.svcCtx.Config.Casdoor
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tokenUrl := fmt.Sprintf("%s/api/login/oauth/access_token", c.Endpoint)
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data := url.Values{}
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data.Set("grant_type", "authorization_code")
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data.Set("client_id", c.ClientId)
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data.Set("client_secret", c.ClientSecret)
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data.Set("code", code)
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data.Set("redirect_uri", c.RedirectUrl)
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req, err := http.NewRequestWithContext(l.ctx, http.MethodPost, tokenUrl,
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strings.NewReader(data.Encode()))
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if err != nil {
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return "", fmt.Errorf("创建请求失败: %v", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := casdoorHttpClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("请求 token 失败: %v", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return "", fmt.Errorf("读取响应失败: %v", err)
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}
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("token 请求返回 %d: %s", resp.StatusCode, string(body))
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}
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var tokenResp casdoorTokenResponse
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if err := json.Unmarshal(body, &tokenResp); err != nil {
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return "", fmt.Errorf("解析 token 响应失败: %v", err)
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}
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if tokenResp.AccessToken == "" {
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return "", fmt.Errorf("未获取到 access_token, 响应: %s", string(body))
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}
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return tokenResp.AccessToken, nil
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}
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// getUserInfo 从 access_token JWT 中解析用户信息
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// Casdoor 的 access_token 本身是一个 JWT，包含完整的用户 claims
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func (l *SSOLogic) getUserInfo(accessToken string) (*casdoorUserInfo, error) {
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// 解析 JWT payload（不验证签名，因为 token 刚从 Casdoor 获取）
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parts := strings.Split(accessToken, ".")
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if len(parts) != 3 {
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return nil, fmt.Errorf("access_token 不是有效的 JWT 格式")
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}
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// Base64 解码 payload
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payload := parts[1]
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// 补齐 base64 padding
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switch len(payload) % 4 {
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case 2:
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payload += "=="
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case 3:
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payload += "="
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}
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decoded, err := base64.URLEncoding.DecodeString(payload)
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if err != nil {
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return nil, fmt.Errorf("解码 JWT payload 失败: %v", err)
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}
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// 解析 JWT claims
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var claims map[string]interface{}
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if err := json.Unmarshal(decoded, &claims); err != nil {
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return nil, fmt.Errorf("解析 JWT claims 失败: %v", err)
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}
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// 从 claims 中提取用户信息（Casdoor JWT 字段名）
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userInfo := &casdoorUserInfo{
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Sub: getStringClaim(claims, "sub"),
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}
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// Casdoor JWT 中用户名可能在 name 或 preferred_username 字段
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userInfo.Name = getStringClaim(claims, "name")
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userInfo.PreferredUsername = getStringClaim(claims, "preferred_username")
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userInfo.Email = getStringClaim(claims, "email")
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userInfo.Phone = getStringClaim(claims, "phone")
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userInfo.Avatar = getStringClaim(claims, "avatar")
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return userInfo, nil
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}
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// getStringClaim 从 claims map 中安全获取字符串值
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func getStringClaim(claims map[string]interface{}, key string) string {
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if v, ok := claims[key]; ok {
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if s, ok := v.(string); ok {
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return s
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}
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}
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return ""
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}
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// generateState 生成随机 state 参数（CSRF 防护）
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func generateState() (string, error) {
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b := make([]byte, 16)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return hex.EncodeToString(b), nil
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}
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