feat(service): 实现 Gemini OAuth 和 Token 管理服务
- 实现 OAuth 授权流程服务 - 添加 Token 提供者和自动刷新机制 - 实现 Gemini Messages API 兼容层 - 更新服务容器注册
This commit is contained in:
ianshaw
305
backend/internal/service/gemini_oauth_service.go
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305
backend/internal/service/gemini_oauth_service.go
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@@ -0,0 +1,305 @@
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package service
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import (
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"context"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/config"
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"github.com/Wei-Shaw/sub2api/internal/model"
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"github.com/Wei-Shaw/sub2api/internal/pkg/geminicli"
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"github.com/Wei-Shaw/sub2api/internal/service/ports"
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)
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type GeminiOAuthService struct {
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sessionStore *geminicli.SessionStore
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proxyRepo ports.ProxyRepository
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oauthClient ports.GeminiOAuthClient
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codeAssist ports.GeminiCliCodeAssistClient
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cfg *config.Config
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}
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func NewGeminiOAuthService(
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proxyRepo ports.ProxyRepository,
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oauthClient ports.GeminiOAuthClient,
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codeAssist ports.GeminiCliCodeAssistClient,
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cfg *config.Config,
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) *GeminiOAuthService {
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return &GeminiOAuthService{
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sessionStore: geminicli.NewSessionStore(),
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proxyRepo: proxyRepo,
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oauthClient: oauthClient,
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codeAssist: codeAssist,
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cfg: cfg,
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}
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}
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type GeminiAuthURLResult struct {
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AuthURL string `json:"auth_url"`
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SessionID string `json:"session_id"`
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State string `json:"state"`
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}
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func (s *GeminiOAuthService) GenerateAuthURL(ctx context.Context, proxyID *int64, redirectURI string) (*GeminiAuthURLResult, error) {
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state, err := geminicli.GenerateState()
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if err != nil {
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return nil, fmt.Errorf("failed to generate state: %w", err)
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}
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codeVerifier, err := geminicli.GenerateCodeVerifier()
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if err != nil {
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return nil, fmt.Errorf("failed to generate code verifier: %w", err)
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}
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codeChallenge := geminicli.GenerateCodeChallenge(codeVerifier)
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sessionID, err := geminicli.GenerateSessionID()
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if err != nil {
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return nil, fmt.Errorf("failed to generate session ID: %w", err)
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}
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var proxyURL string
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if proxyID != nil {
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proxy, err := s.proxyRepo.GetByID(ctx, *proxyID)
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if err == nil && proxy != nil {
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proxyURL = proxy.URL()
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}
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}
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session := &geminicli.OAuthSession{
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State: state,
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CodeVerifier: codeVerifier,
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ProxyURL: proxyURL,
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RedirectURI: redirectURI,
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CreatedAt: time.Now(),
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}
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s.sessionStore.Set(sessionID, session)
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oauthCfg := geminicli.OAuthConfig{
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ClientID: s.cfg.Gemini.OAuth.ClientID,
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ClientSecret: s.cfg.Gemini.OAuth.ClientSecret,
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Scopes: s.cfg.Gemini.OAuth.Scopes,
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}
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authURL, err := geminicli.BuildAuthorizationURL(oauthCfg, state, codeChallenge, redirectURI)
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if err != nil {
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return nil, err
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}
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return &GeminiAuthURLResult{
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AuthURL: authURL,
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SessionID: sessionID,
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State: state,
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}, nil
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}
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type GeminiExchangeCodeInput struct {
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SessionID string
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State string
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Code string
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RedirectURI string
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ProxyID *int64
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}
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type GeminiTokenInfo struct {
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AccessToken string `json:"access_token"`
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RefreshToken string `json:"refresh_token"`
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ExpiresIn int64 `json:"expires_in"`
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ExpiresAt int64 `json:"expires_at"`
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TokenType string `json:"token_type"`
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Scope string `json:"scope,omitempty"`
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ProjectID string `json:"project_id,omitempty"`
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}
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func (s *GeminiOAuthService) ExchangeCode(ctx context.Context, input *GeminiExchangeCodeInput) (*GeminiTokenInfo, error) {
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session, ok := s.sessionStore.Get(input.SessionID)
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if !ok {
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return nil, fmt.Errorf("session not found or expired")
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}
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if strings.TrimSpace(input.State) == "" || input.State != session.State {
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return nil, fmt.Errorf("invalid state")
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}
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proxyURL := session.ProxyURL
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if input.ProxyID != nil {
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proxy, err := s.proxyRepo.GetByID(ctx, *input.ProxyID)
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if err == nil && proxy != nil {
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proxyURL = proxy.URL()
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}
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}
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redirectURI := session.RedirectURI
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if strings.TrimSpace(input.RedirectURI) != "" {
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redirectURI = input.RedirectURI
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}
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tokenResp, err := s.oauthClient.ExchangeCode(ctx, input.Code, session.CodeVerifier, redirectURI, proxyURL)
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if err != nil {
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return nil, fmt.Errorf("failed to exchange code: %w", err)
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}
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s.sessionStore.Delete(input.SessionID)
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expiresAt := time.Now().Unix() + tokenResp.ExpiresIn
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projectID, _ := s.fetchProjectID(ctx, tokenResp.AccessToken, proxyURL)
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return &GeminiTokenInfo{
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AccessToken: tokenResp.AccessToken,
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RefreshToken: tokenResp.RefreshToken,
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TokenType: tokenResp.TokenType,
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ExpiresIn: tokenResp.ExpiresIn,
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ExpiresAt: expiresAt,
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Scope: tokenResp.Scope,
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ProjectID: projectID,
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}, nil
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}
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func (s *GeminiOAuthService) RefreshToken(ctx context.Context, refreshToken, proxyURL string) (*GeminiTokenInfo, error) {
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var lastErr error
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for attempt := 0; attempt <= 3; attempt++ {
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if attempt > 0 {
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backoff := time.Duration(1<<uint(attempt-1)) * time.Second
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if backoff > 30*time.Second {
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backoff = 30 * time.Second
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}
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time.Sleep(backoff)
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}
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tokenResp, err := s.oauthClient.RefreshToken(ctx, refreshToken, proxyURL)
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if err == nil {
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expiresAt := time.Now().Unix() + tokenResp.ExpiresIn
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return &GeminiTokenInfo{
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AccessToken: tokenResp.AccessToken,
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RefreshToken: tokenResp.RefreshToken,
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TokenType: tokenResp.TokenType,
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ExpiresIn: tokenResp.ExpiresIn,
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ExpiresAt: expiresAt,
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Scope: tokenResp.Scope,
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}, nil
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}
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if isNonRetryableGeminiOAuthError(err) {
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return nil, err
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}
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lastErr = err
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}
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return nil, fmt.Errorf("token refresh failed after retries: %w", lastErr)
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}
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func isNonRetryableGeminiOAuthError(err error) bool {
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msg := err.Error()
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nonRetryable := []string{
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"invalid_grant",
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"invalid_client",
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"unauthorized_client",
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"access_denied",
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}
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for _, needle := range nonRetryable {
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if strings.Contains(msg, needle) {
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return true
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}
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}
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return false
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}
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func (s *GeminiOAuthService) RefreshAccountToken(ctx context.Context, account *model.Account) (*GeminiTokenInfo, error) {
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if account.Platform != model.PlatformGemini || account.Type != model.AccountTypeOAuth {
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return nil, fmt.Errorf("account is not a Gemini OAuth account")
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}
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refreshToken := account.GetCredential("refresh_token")
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if strings.TrimSpace(refreshToken) == "" {
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return nil, fmt.Errorf("no refresh token available")
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}
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var proxyURL string
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if account.ProxyID != nil {
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proxy, err := s.proxyRepo.GetByID(ctx, *account.ProxyID)
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if err == nil && proxy != nil {
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proxyURL = proxy.URL()
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}
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}
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return s.RefreshToken(ctx, refreshToken, proxyURL)
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}
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func (s *GeminiOAuthService) BuildAccountCredentials(tokenInfo *GeminiTokenInfo) map[string]any {
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creds := map[string]any{
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"access_token": tokenInfo.AccessToken,
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"expires_at": strconv.FormatInt(tokenInfo.ExpiresAt, 10),
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}
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if tokenInfo.RefreshToken != "" {
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creds["refresh_token"] = tokenInfo.RefreshToken
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}
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if tokenInfo.TokenType != "" {
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creds["token_type"] = tokenInfo.TokenType
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}
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if tokenInfo.Scope != "" {
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creds["scope"] = tokenInfo.Scope
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}
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if tokenInfo.ProjectID != "" {
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creds["project_id"] = tokenInfo.ProjectID
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}
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return creds
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}
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func (s *GeminiOAuthService) Stop() {
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s.sessionStore.Stop()
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}
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func (s *GeminiOAuthService) fetchProjectID(ctx context.Context, accessToken, proxyURL string) (string, error) {
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if s.codeAssist == nil {
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return "", errors.New("code assist client not configured")
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}
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loadResp, err := s.codeAssist.LoadCodeAssist(ctx, accessToken, proxyURL, nil)
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if err == nil && strings.TrimSpace(loadResp.CurrentTier) != "" && strings.TrimSpace(loadResp.CloudAICompanionProject) != "" {
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return strings.TrimSpace(loadResp.CloudAICompanionProject), nil
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}
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// pick default tier from allowedTiers, fallback to LEGACY.
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tierID := "LEGACY"
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if loadResp != nil {
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for _, tier := range loadResp.AllowedTiers {
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if tier.IsDefault && strings.TrimSpace(tier.ID) != "" {
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tierID = tier.ID
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break
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}
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}
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}
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req := &geminicli.OnboardUserRequest{
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TierID: tierID,
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Metadata: geminicli.LoadCodeAssistMetadata{
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IDEType: "ANTIGRAVITY",
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Platform: "PLATFORM_UNSPECIFIED",
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PluginType: "GEMINI",
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},
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}
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maxAttempts := 5
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for attempt := 1; attempt <= maxAttempts; attempt++ {
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resp, err := s.codeAssist.OnboardUser(ctx, accessToken, proxyURL, req)
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if err != nil {
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return "", err
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}
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if resp.Done {
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if resp.Response == nil || resp.Response.CloudAICompanionProject == nil {
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return "", errors.New("onboardUser completed but no project_id returned")
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}
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switch v := resp.Response.CloudAICompanionProject.(type) {
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case string:
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return strings.TrimSpace(v), nil
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case map[string]any:
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if id, ok := v["id"].(string); ok {
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return strings.TrimSpace(id), nil
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}
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}
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return "", errors.New("onboardUser returned unsupported project_id format")
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}
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time.Sleep(2 * time.Second)
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}
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return "", fmt.Errorf("onboardUser timeout after %d attempts", maxAttempts)
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}
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Reference in New Issue
Block a user