fix: 修复Oauth账号自动刷新token失败的bug

backend/internal/service/token_refresher.go

@@ -0,0 +1,90 @@
+package service
+
+import (
+	"context"
+	"strconv"
+	"time"
+
+	"sub2api/internal/model"
+)
+
+// TokenRefresher 定义平台特定的token刷新策略接口
+// 通过此接口可以扩展支持不同平台（Anthropic/OpenAI/Gemini）
+type TokenRefresher interface {
+	// CanRefresh 检查此刷新器是否能处理指定账号
+	CanRefresh(account *model.Account) bool
+
+	// NeedsRefresh 检查账号的token是否需要刷新
+	NeedsRefresh(account *model.Account, refreshWindow time.Duration) bool
+
+	// Refresh 执行token刷新，返回更新后的credentials
+	// 注意：返回的map应该保留原有credentials中的所有字段，只更新token相关字段
+	Refresh(ctx context.Context, account *model.Account) (map[string]interface{}, error)
+}
+
+// ClaudeTokenRefresher 处理Anthropic/Claude OAuth token刷新
+type ClaudeTokenRefresher struct {
+	oauthService *OAuthService
+}
+
+// NewClaudeTokenRefresher 创建Claude token刷新器
+func NewClaudeTokenRefresher(oauthService *OAuthService) *ClaudeTokenRefresher {
+	return &ClaudeTokenRefresher{
+		oauthService: oauthService,
+	}
+}
+
+// CanRefresh 检查是否能处理此账号
+// 只处理 anthropic 平台的 oauth 类型账号
+// setup-token 虽然也是OAuth，但有效期1年，不需要频繁刷新
+func (r *ClaudeTokenRefresher) CanRefresh(account *model.Account) bool {
+	return account.Platform == model.PlatformAnthropic &&
+		account.Type == model.AccountTypeOAuth
+}
+
+// NeedsRefresh 检查token是否需要刷新
+// 基于 expires_at 字段判断是否在刷新窗口内
+func (r *ClaudeTokenRefresher) NeedsRefresh(account *model.Account, refreshWindow time.Duration) bool {
+	expiresAtStr := account.GetCredential("expires_at")
+	if expiresAtStr == "" {
+		return false
+	}
+
+	expiresAt, err := strconv.ParseInt(expiresAtStr, 10, 64)
+	if err != nil {
+		return false
+	}
+
+	expiryTime := time.Unix(expiresAt, 0)
+	return time.Until(expiryTime) < refreshWindow
+}
+
+// Refresh 执行token刷新
+// 保留原有credentials中的所有字段，只更新token相关字段
+func (r *ClaudeTokenRefresher) Refresh(ctx context.Context, account *model.Account) (map[string]interface{}, error) {
+	tokenInfo, err := r.oauthService.RefreshAccountToken(ctx, account)
+	if err != nil {
+		return nil, err
+	}
+
+	// 保留现有credentials中的所有字段
+	newCredentials := make(map[string]interface{})
+	for k, v := range account.Credentials {
+		newCredentials[k] = v
+	}
+
+	// 只更新token相关字段
+	// 注意：expires_at 和 expires_in 必须存为字符串，因为 GetCredential 只返回 string 类型
+	newCredentials["access_token"] = tokenInfo.AccessToken
+	newCredentials["token_type"] = tokenInfo.TokenType
+	newCredentials["expires_in"] = strconv.FormatInt(tokenInfo.ExpiresIn, 10)
+	newCredentials["expires_at"] = strconv.FormatInt(tokenInfo.ExpiresAt, 10)
+	if tokenInfo.RefreshToken != "" {
+		newCredentials["refresh_token"] = tokenInfo.RefreshToken
+	}
+	if tokenInfo.Scope != "" {
+		newCredentials["scope"] = tokenInfo.Scope
+	}
+
+	return newCredentials, nil
+}