first commit

backend/internal/service/gemini_token_refresher.go

@@ -0,0 +1,45 @@
+package service
+
+import (
+	"context"
+	"time"
+)
+
+type GeminiTokenRefresher struct {
+	geminiOAuthService *GeminiOAuthService
+}
+
+func NewGeminiTokenRefresher(geminiOAuthService *GeminiOAuthService) *GeminiTokenRefresher {
+	return &GeminiTokenRefresher{geminiOAuthService: geminiOAuthService}
+}
+
+func (r *GeminiTokenRefresher) CanRefresh(account *Account) bool {
+	return account.Platform == PlatformGemini && account.Type == AccountTypeOAuth
+}
+
+func (r *GeminiTokenRefresher) NeedsRefresh(account *Account, refreshWindow time.Duration) bool {
+	if !r.CanRefresh(account) {
+		return false
+	}
+	expiresAt := account.GetCredentialAsTime("expires_at")
+	if expiresAt == nil {
+		return false
+	}
+	return time.Until(*expiresAt) < refreshWindow
+}
+
+func (r *GeminiTokenRefresher) Refresh(ctx context.Context, account *Account) (map[string]any, error) {
+	tokenInfo, err := r.geminiOAuthService.RefreshAccountToken(ctx, account)
+	if err != nil {
+		return nil, err
+	}
+
+	newCredentials := r.geminiOAuthService.BuildAccountCredentials(tokenInfo)
+	for k, v := range account.Credentials {
+		if _, exists := newCredentials[k]; !exists {
+			newCredentials[k] = v
+		}
+	}
+
+	return newCredentials, nil
+}