oauth - Google API OAuth2，服务帐户， "error": "invalid_grant"

Question

我正在尝试使用服务帐户将日历从 Dynamics CRM 软件同步到 Google。
在此期间，我面临缺乏关于 .net 的 google API 的文档，尤其是关于授权的文档。由于使用了过时的库和类，大多数 Google 示例甚至无法编译。

所以我在实习生中找到了一些例子并收到错误。 有人可以看看我的样本并告诉我我做错了什么吗？

准备步骤:

我在我的私有(private) Google 帐户中创建了一个项目。

在项目开发者控制台中，在 APIS & AUTH -> Credentials 下，我生成了服务帐户。然后单击“生成 P12 key ”并下载 .p12 文件。

在 APIS & AUTH -> APIs 下，打开“日历 API”

然后创建控制台应用程序并设法安装 OAuth 和日历 nuget 包。有:

Google API 身份验证客户端库，Google.Apis.Auth 1.8.1

Google API 客户端库，Google.Apis 1.8.1

Google API 核心客户端库，ID:Google.Apis.Core 1.8.1

Google.APIs.Calendar.v3 客户端库，Google.Apis.Calendar.V3 1.8.1.860

找到并适应了我的需要的代码:

using System;
using System.Security.Cryptography.X509Certificates;
using Google.Apis.Calendar.v3;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;

namespace CrmToGoogleCalendar
{
    class Program
    {

        static void Connect()
        {
            var certificate = new X509Certificate2("My Project-ee7facaa2bb1.p12", "notasecret", X509KeyStorageFlags.Exportable);


            var serviceAccountEmail = "506310960175-q2k8hjl141bml57ikufinsh6n8qiu93b@developer.gserviceaccount.com";
            var userAccountEmail = "<my email>@gmail.com";
            var credential = new ServiceAccountCredential(new ServiceAccountCredential.Initializer(serviceAccountEmail) 
                {
                    User = userAccountEmail,
                    Scopes = new[] { CalendarService.Scope.Calendar }
                }
                .FromCertificate(certificate));

            var service = new CalendarService(new BaseClientService.Initializer()
            {
                ApplicationName = "Test calendar sync app",
                HttpClientInitializer = credential

            });

            var calList = service.CalendarList.List().Execute().Items;


            foreach (var cal in calList)
            {
                Console.WriteLine(cal.Id);
            }
        }


        static void Main(string[] args)
        {
            Connect();
        }
    }
}

我在应用程序和 Fiddler 中看到的与 Google API 的通信是:

要求 :

Host: HTTPS accounts.google.com, URL: /o/oauth2/token
Assertion: long binary string
grant_type: urn:ietf:params:oauth:grant-type:jwt-bearer

回复:

HTTP/1.1 400 Bad Request Content-Type: application/json Cache-Control: no-cache, no-store, max-age=0, must-revalidate Pragma: no-cache Expires: Fri, 01 Jan 1990 00:00:00 GMT Date: Thu, 24 Jul 2014 06:12:18 GMT X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN X-XSS-Protection: 1; mode=block Server: GSE Alternate-Protocol: 443:quic Transfer-Encoding: chunked

1f { "error" : "invalid_grant" } 0

请提前帮助和感谢!

Answer 1

经过一些调查，我发现 Google API 无法与您的个人帐户 @gmail.com 正常工作。您应该在 Google 中拥有格式为 you@your_organisation_domain 的组织域帐户

然后，同样令人困惑的是，Google Drive API page 上有文档。 , 与 “将域范围的权限委派给您的服务帐户”日历 API 页面上未提及的部分。
该部分有 7 个步骤，必须完成。

顺便说一句，个人帐户管理网站 admin.google.com 甚至不可用。因此，使用@gmail.com 帐户执行这 7 个步骤是不可能的。

然后，当客户端在 Google Apps 管理控制台 > 安全 > 高级设置 > 管理 OAuth 客户端访问中获得授权时，代码开始工作。

有一个代码对我有用:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;

namespace CrmToGoogleCalendar
{
    class Program
    {

        static void Connect()
        {
            Console.WriteLine("Calendar via OAuth2 Service Account Sample");

            var certificate = new X509Certificate2("My MC Project-3f38defdf4e4.p12", "notasecret", X509KeyStorageFlags.Exportable);
            var serviceAccountEmail = "795039984093-c6ab1mknpediih2eo9cb70mc9jpu9h03@developer.gserviceaccount.com";
            var userAccountEmail = "me@testdomain.com"; 
            var credential = new ServiceAccountCredential(new ServiceAccountCredential.Initializer(serviceAccountEmail) 
                {
                    User = userAccountEmail,
                    Scopes = new[] { CalendarService.Scope.Calendar }
                }
                .FromCertificate(certificate));

            var service = new CalendarService(new BaseClientService.Initializer()
            {
                ApplicationName = "Test calendar sync app",
                HttpClientInitializer = credential

            });

            /* Get list of calendars */
            var calList = service.CalendarList.List().Execute().Items;
            var myCalendar = calList.First(@c => @c.Id == userAccountEmail);

            /* CREATE EVENT */
            var event1 = new Event()
                {
                    Kind = "calendar#event",
                    Summary = "Calendar event via API",
                    Description = "Programmatically created",
                    Status = "confirmed",
                    Organizer = new Event.OrganizerData() {
                        Email = userAccountEmail
                    },
                    Start = new EventDateTime()
                        {
                            DateTime = DateTime.Now.AddDays(1)
                        },
                    End = new EventDateTime()
                    {
                        DateTime = DateTime.Now.AddDays(1).AddHours(1)
                    },
                    ColorId = "6",
                    Reminders = new Event.RemindersData()
                        {
                            UseDefault = false,
                            Overrides = new List<EventReminder>(
                                new [] {
                                    new EventReminder()
                                        {
                                            Method = "popup",
                                            Minutes = 60
                                        }
                                })
                        }
                };

            event1 = service.Events.Insert(event1, myCalendar.Id).Execute();
            Console.WriteLine("Created event Id: {0}", event1.Id);


            /* ENLIST EVENTS */
            Console.WriteLine("calendar id={0}", myCalendar.Id);
            var events = service.Events.List(myCalendar.Id).Execute();
            foreach (var @event in events.Items)
            {
                Console.WriteLine("Event ID: {0}, ICalUID: {1}", @event.Id, @event.ICalUID);
                Console.WriteLine("  Name: {0}", @event.Summary);
                Console.WriteLine("  Description: {0}", @event.Description);
                Console.WriteLine("  Status: {0}", @event.Status);
                Console.WriteLine("  Color: {0}", @event.ColorId);
                Console.WriteLine("  Attendees: {0}", @event.Attendees == null ? "" : @event.Attendees.Select(a => a.Email).ToString());
                Console.WriteLine("  Kind: {0}", @event.Kind);
                Console.WriteLine("  Location: {0}", @event.Location);
                Console.WriteLine("  Organizer: {0}", @event.Organizer.Email);
                Console.WriteLine("  Recurrence: {0}", @event.Recurrence == null ? "no recurrence" : String.Join(",", @event.Recurrence));
                Console.WriteLine("  Start: {0}", @event.Start.DateTime == null ? @event.Start.Date : @event.Start.DateTime.ToString());
                Console.WriteLine("  End: {0}", @event.End.DateTime == null ? @event.End.Date : @event.End.DateTime.ToString());
                Console.WriteLine("  Reminders: {0}", @event.Reminders.UseDefault.Value ? "Default" : "Not defailt, " + 
                    (@event.Reminders.Overrides == null ? "no overrides" : String.Join(",", @event.Reminders.Overrides.Select(reminder => reminder.Method + ":" + reminder.Minutes)))
                    );
                Console.WriteLine("=====================");
            }

            Console.ReadKey();
        }


        static void Main(string[] args)
        {
            Connect();
        }
    }
}

产生的输出看起来是这样的:

Calendar via OAuth2 Service Account Sample
Created event Id: jkits4dnpq6oflf99mfqf1kdo0
calendar id=me@testdomain.com
Event ID: 1logvocs77jierahutgv962sus, ICalUID: 1logvocs77jierahutgv962sus@google.com
  Name: test event
  Description: test description2
  Status: confirmed
  Color: 
  Attendees: 
  Kind: calendar#event
  Location: location2
  Organizer: me@testdomain.com
  Recurrence: RRULE:FREQ=WEEKLY;BYDAY=TH
  Start: 2014-07-31
  End: 2014-08-01
  Reminders: Not defailt, email:10,popup:10
=====================
Event ID: 1logvocs77jierahutgv962sus_20140814, ICalUID: 1logvocs77jierahutgv962sus@google.com
  Name: test event updated
  Description: test description2
  Status: confirmed
  Color: 
  Attendees: 
  Kind: calendar#event
  Location: location2
  Organizer: me@testdomain.com
  Recurrence: no recurrence
  Start: 2014-08-14
  End: 2014-08-15
  Reminders: Not defailt, email:10
=====================
Event ID: 974hqdhh8jhv5sdobkggmdvvd8, ICalUID: 974hqdhh8jhv5sdobkggmdvvd8@google.com
  Name: One hour event
  Description: test description
  Status: confirmed
  Color: 7
  Attendees: 
  Kind: calendar#event
  Location: Meeting Room Hire, Broadway, 255 The Bdwy, Broadway, NSW 2007, Australia
  Organizer: me@testdomain.com
  Recurrence: no recurrence
  Start: 1/08/2014 10:00:00 AM
  End: 1/08/2014 11:00:00 AM
  Reminders: Default
=====================
Event ID: jkits4dnpq6oflf99mfqf1kdo0, ICalUID: jkits4dnpq6oflf99mfqf1kdo0@google.com
  Name: Calendar event via API
  Description: Programmatically created
  Status: confirmed
  Color: 6
  Attendees: 
  Kind: calendar#event
  Location: 
  Organizer: me@testdomain.com
  Recurrence: no recurrence
  Start: 2/08/2014 12:30:50 PM
  End: 2/08/2014 1:30:50 PM
  Reminders: Not defailt, popup:60
=====================

第一个事件是每周一次的全天事件系列。
第二个是更新第一个事件的单个事件(具有相同的 UID)。
第三是一小时的单项事件。
最后一个是由上面的代码创建的。

希望这将有助于其他人节省时间。