96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package service
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import (
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"context"
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"log/slog"
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"net/http"
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"net/http/cookiejar"
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"net/url"
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"time"
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"schedule_converter/auth"
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"schedule_converter/captcha"
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"schedule_converter/client"
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"schedule_converter/config"
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apperr "schedule_converter/pkg/errors"
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)
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const (
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maxLoginRetries = 3
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loginRetryInterval = 3 * time.Second
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)
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// Service 封装教务系统的登录与数据抓取编排逻辑。
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type Service struct{}
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// NewService 创建 service。
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func NewService() *Service {
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return &Service{}
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}
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// newAuthenticatedClient 创建带 cookie jar 的 HTTP 客户端，设置 TWFID cookie 并完成登录。
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func (s *Service) newAuthenticatedClient(ctx context.Context, username, password, twfid string) (*http.Client, error) {
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jar, err := cookiejar.New(nil)
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if err != nil {
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return nil, apperr.New("create_jar", err, "创建 cookie jar 失败")
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}
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httpClient := &http.Client{Jar: jar}
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if twfid == "" {
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twfid = config.Get().TWFID
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}
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s.setTWFIDCookie(httpClient, config.Get().BaseURL, twfid)
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if err := s.login(ctx, httpClient, username, password); err != nil {
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return nil, err
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}
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return httpClient, nil
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}
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func (s *Service) setTWFIDCookie(httpClient *http.Client, baseURL, twfid string) {
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u, err := url.Parse(baseURL)
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if err != nil {
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slog.Warn("解析 baseURL 失败，无法设置 TWFID cookie", "base_url", baseURL, "error", err)
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return
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}
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httpClient.Jar.SetCookies(u, []*http.Cookie{
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{Name: "TWFID", Value: twfid},
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})
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}
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// login 执行登录流程，验证码固定使用占位值 "...."。
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func (s *Service) login(ctx context.Context, httpClient *http.Client, username, password string) error {
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log := slog.With("username", username)
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if err := client.GetInitialCookiesWithClient(httpClient); err != nil {
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return apperr.New("get_cookies", err, "获取初始 Cookie 失败")
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}
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for attempt := 1; attempt <= maxLoginRetries; attempt++ {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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log.Info("尝试登录", "attempt", attempt, "max_retries", maxLoginRetries)
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captchaCode := captcha.GetCaptchaCode()
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success, err := auth.LoginWithClient(ctx, httpClient, captchaCode, username, password)
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if err != nil {
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log.Warn("登录请求失败", "error", err, "attempt", attempt)
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time.Sleep(loginRetryInterval)
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continue
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}
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if success {
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return nil
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}
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log.Warn("登录验证失败", "attempt", attempt)
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time.Sleep(loginRetryInterval)
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}
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return apperr.ErrLoginFailed
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}
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