Question

我正在尝试刷新AWS Cognito中用户的访问令牌。我收到错误消息：您在期望流的位置提供了“ undefined”。您可以在第一次调用refreshSession方法之后立即提供Observable，Promise，Array或Iterable 。我在Angular 7中使用HttpInterceptor。下面是我的代码：

public intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // process the request
    return next.handle(request).pipe(
        catchError((httpError: any) => {
            // check if the error is a permission issue
            if (httpError instanceof HttpErrorResponse && httpError.status === 401 {
                const poolData = {
                    UserPoolId: <userPoolId>,
                    ClientId: <clientId>
                };
                const userPool = new AmazonCognitoIdentity.CognitoUserPool(poolData);
                const cognitoUser = userPool.getCurrentUser();
                if (cognitoUser != null) {
                    cognitoUser.getSession((error, session) => {
                        if (error) {
                            cognitoUser.signOut();
                            this.router.navigate(['/login']);
                        }
                        cognitoUser.refreshSession(session.refreshToken, (refreshError, refreshSession) => {
                            if (refreshError) {
                                cognitoUser.signOut();
                                this.router.navigate(['/login']);
                            }
                            // set the cognito credentials
                            AWS.config.credentials = new AWS.CognitoIdentityCredentials({
                                IdentityPoolId: this.identityPoolId,
                                Logins: { [`cognito-idp.${<region>}.amazonaws.com/${<userPoolId>}`]: refreshSession.getIdToken().getJwtToken() }
                            });
                            (AWS.config.credentials as AWS.Credentials).refresh(err => {
                                if (err) {
                                    cognitoUser.signOut();
                                    this.router.navigate(['/login']);
                                }
                            });
                        });
                    });
                }
            } else {
                return of(httpError);
            }
        })
    );
}

Answer 1

在您的catchError内，该函数仅在of(httpError)子句中返回可观察的（else）。如果错误是401，则没有返回值（即 undefined ）。即使您不在乎返回值（在这种情况下，of(null)或EMPTY应该可以。）

错误您在期望流的位置提供了“未定义”。您可以在Cognito中提供一个Observable，Promise，Array或Iterable调用refreshSession

1 个答案: