Question

我正在尝试创建一个可以预订会议的机器人。为了做到这一点，我需要访问员工的日历以获得FreeBusy信息以最终预订会议。我试图避免硬编码电子邮件和密码，为此我想使用Azure AD中的访问令牌来调用EWS。我设置了

的属性

public static ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);

使用此方法：

       public static async System.Threading.Tasks.Task UseExchangeService(IDialogContext context, string userEmailAddress, SecureString     userPassword)
         {
        string authority = ConfigurationManager.AppSettings["authority"];
        string clientID = ConfigurationManager.AppSettings["clientID"];
         string resource = ConfigurationManager.AppSettings["resource"];
        string appKey = ConfigurationManager.AppSettings["appkey"];

        AuthenticationContext authenticationContext = new AuthenticationContext(authority, false);
        ClientCredential clientCred = new ClientCredential(clientID, appKey);
        AuthenticationResult authenticationResult = await authenticationContext.AcquireTokenAsync(resource, clientCred);
        service.Url = new Uri(ConfigurationManager.AppSettings["serverName"] + "/ews/exchange.asmx");
        service.TraceEnabled = true;
        service.TraceFlags = TraceFlags.All;
        service.Credentials = new OAuthCredentials(authenticationResult.AccessToken);


        // USING THIS LINE IT WORKS FINE!
        // service.Credentials = new NetworkCredential(userEmailAddress, userPassword); // VIRKER

    }

我从Azure AD获取访问令牌，并且我已在Azure AD中授予该应用程序的权限。

我使用这种方法来提取freebusytimes，它包含其他更多的代码来显示时间作为herocard上的按钮，但这是对EWS的调用：

       List<AttendeeInfo> attendees = new List<AttendeeInfo>();
        attendees.Add(new AttendeeInfo()
        {
            SmtpAddress = "MyEMAIL",
            AttendeeType = MeetingAttendeeType.Organizer
        });

        attendees.Add(new AttendeeInfo()
        {
            SmtpAddress = BookersEmail,
            AttendeeType = MeetingAttendeeType.Required
        });
        //DateTime date1 = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day.Ad, 7, 0, 0)
        // Specify options to request free/busy information and suggested meeting times.
        AvailabilityOptions availabilityOptions = new AvailabilityOptions();
        availabilityOptions.GoodSuggestionThreshold = 49;
        availabilityOptions.MaximumNonWorkHoursSuggestionsPerDay = 0;
        availabilityOptions.MaximumSuggestionsPerDay = 20;
        // Note that 60 minutes is the default value for MeetingDuration, but setting it explicitly for demonstration purposes.
        availabilityOptions.MeetingDuration = 60;
        availabilityOptions.MinimumSuggestionQuality = SuggestionQuality.Excellent;

        //TimeWindow hej = new TimeWindow();
        DateTime StartDay = DateTime.Now.AddDays(1);
        TimeSpan ts = new TimeSpan(9, 0, 0);
        DateTime StartTime = StartDay.Date + ts;

        availabilityOptions.DetailedSuggestionsWindow = new TimeWindow(StartTime, DateTime.Now.AddDays(4));
        availabilityOptions.RequestedFreeBusyView = FreeBusyViewType.FreeBusy;
        // Return free/busy information and a set of suggested meeting times. 
        // This method results in a GetUserAvailabilityRequest call to EWS.
        GetUserAvailabilityResults results = service.GetUserAvailability(attendees,
                                                                         availabilityOptions.DetailedSuggestionsWindow,
                                                                         AvailabilityData.FreeBusyAndSuggestions,
                                                                         availabilityOptions);

我在Azure AD中创建了应用程序，并且我已授予以下权限： Office 365 Exchange Online：

使用对所有邮箱具有完全访问权限的Exchange Web服务

在所有邮箱中读写日历

读写用户和共享日历

通过Exchange Web服务以登录用户身份访问邮箱

我已尝试过在stackoverflow上找到的其他答案，但是他们并没有为我做这个伎俩。希望你能帮忙

Answer 1

我不熟悉EWS，但据我所知，Microsoft Graph还提供了类似的功能，可以使用下面的其余内容查找可用的会议时间（请参阅here）：

POST /me/findMeetingTimes

如果您希望将此REST用于Web应用程序，以便您的Web应用程序可以委派登录用户执行Exchange操作，我们可以使用 OAuth 2.0代码授权流程 。有关如何使用此流程与Microsoft Graph集成，您可以参考以下链接：

Get started with Microsoft Graph in an ASP.NET 4.6 MVC app

以下是此流程的详细信息：

Authorize access to web applications using OAuth 2.0 and Azure Active Directory

希望它有用。

EWS Oauth异常：请求失败。远程服务器返回错误：（401）未经授权

1 个答案: