如何通过Microsoft Graph API检索itemAttachment的内容

Question

我目前正在开发一种解决方案，该解决方案通过Microsoft Graph API检索电子邮件。在2015年11月，Microsoft宣布已准备好投入生产，我在另一篇论坛文章中读到，如果您现在开始使用Microsoft API进行开发，则应该使用Graph API，因为这是未来。

除了一件事情，一切都进行得很好，那就是接下来的事情。

我必须检索电子邮件。这些电子邮件中当然有附件。这些附件有些不同。fileAttachment（图像，文档等），referenceAttachments和itemAttachments（outlook-item）。这里的问题与itemAttachments有关。itemAttachment可以是从约会到其他消息的任何内容。这里的问题是，我无法以某种适用于fileAttachments的方式获取和检索contentBytes。与itemAttachment相关的对象是outlookItem。还有一个页面对此OutlookItem进行了描述，但是缺少示例和详细信息。用户权限设置为Mail.Read和Mail.ReadWrite。

链接：概述：http : //graph.microsoft.io/docs/overview/overview获取outlookItem（空？）：

我得到的示例呼叫和响应。请注意附件的类型。 https://graph.microsoft.com/v1.0 / users / / messages / / attachments

{
  "@odata.context": "link",
  "value": [
    {
      "@odata.type": "#microsoft.graph.fileAttachment",
      "id": "AAMkAGU2NmIwMTcxLTljYzUtNGRiMi1hZjczLTllNzhiZDRiNWZlZABGAAAAPAD_Lx_gimDGRqSr98J_O_e6BwDcWyYHlO7rS5_XpLHCx6NSAAIMC0V-AADcWyYHlO7rS5_XpLHCx6NSAAIMC6RgAAABEgAQAGhN_vm1RlBPt7V4N9a89UY=",
      "lastModifiedDateTime": "2016-01-13T14:25:33Z",
      "name": "image001.png",
      "contentType": "image/png",
      "size": 5077,
      "isInline": true,
      "contentId": "image001.png@01D14E16.A3A32480",
      "contentLocation": null,
      "contentBytes": "iVBORw0KGgoAAAANSUhEUgAAAKAAAACCCAIAAABOyVRHAAAAAXNSR0IArs4c6QAAEndJREFUeF7tXQ1QFFe2bkbU... (truncated)"
    },
    {
      "@odata.type": "#microsoft.graph.fileAttachment",
      "id": "AAMkAGU2NmIwMTcxLTljYzUtNGRiMi1hZjczLTllNzhiZDRiNWZlZABGAAAAPAD_Lx_gimDGRqSr98J_O_e6BwDcWyYHlO7rS5_XpLHCx6NSAAIMC0V-AADcWyYHlO7rS5_XpLHCx6NSAAIMC6RgAAABEgAQAFnSLgIC5wZOosmLtBWK8gE=",
      "lastModifiedDateTime": "2016-01-13T14:25:34Z",
      "name": "image002.png",
      "contentType": "image/png",
      "size": 3722,
      "isInline": true,
      "contentId": "image002.png@01D14E16.A3A32480",
      "contentLocation": null,
      "contentBytes": "iVBORw0KGgoAAAANSUhEUgAAAPoAAABSCAYAAAB9o8m+AAAAGXRFWHRTb... (truncated)"
    },
    {
      "@odata.type": "#microsoft.graph.fileAttachment",
      "id": "AAMkAGU2NmIwMTcxLTljYzUtNGRiMi1hZjczLTllNzhiZDRiNWZlZABGAAAAPAD_Lx_gimDGRqSr98J_O_e6BwDcWyYHlO7rS5_XpLHCx6NSAAIMC0V-AADcWyYHlO7rS5_XpLHCx6NSAAIMC6RgAAABEgAQANOuw7m8sW1Ot3MivYQ5OYU=",
      "lastModifiedDateTime": "2016-01-13T14:25:24Z",
      "name": "Knipsel.PNG",
      "contentType": null,
      "size": 7641,
      "isInline": false,
      "contentId": null,
      "contentLocation": null,
      "contentBytes": "iVBORw0KGgoAAAANSUhEUgAAAKAAAACCCAYAAADBq8MQAAA... (truncated)"
    },
    {
      "@odata.type": "#microsoft.graph.itemAttachment",
      "id": "AAMkAGU2NmIwMTcxLTljYzUtNGRiMi1hZjczLTllNzhiZDRiNWZlZABGAAAAPAD_Lx_gimDGRqSr98J_O_e6BwDcWyYHlO7rS5_XpLHCx6NSAAIMC0V-AADcWyYHlO7rS5_XpLHCx6NSAAIMC6RgAAABEgAQAPEUC740tjtAlNTe8NpopUI=",
      "lastModifiedDateTime": "2016-01-14T15:55:07Z",
      "name": "RE: Test met plaatje",
      "contentType": null,
      "size": 36972,
      "isInline": false
    }
  ]
}

我试图通过粘贴带有或不带有消息路径和扩展功能（仅深一层支持）的附件ID来更改GET语句，但是我似乎找不到解决方案。我发现的是这个问题，这个问题是相同的，但是它是针对office365统一API的。如何从Office 365 REST API检索ItemAttachment内容？。

所以，问题是：如何通过Microsoft Graph API检索outlookItem的内容？我怎么知道会发生什么呢？谁能帮助我克服这个障碍。

Answer 1

使用$expand选项：

GET https://graph.microsoft.com/v1.0/me/messages('AAMkADA1M-zAAA=')/attachments('AAMkADA1M-CJKtzmnlcqVgqI=')/?$expand=microsoft.graph.itemattachment/item 

回复：

HTTP/1.1 200 OK
Content-type: application/json

{
  "@odata.context":"https://graph.microsoft.com/v1.0/$metadata#users('d1a2fae9-db66-4cc9-8133-2184c77af1b8')/messages('AAMkADA1M-zAAA%3D')/attachments/$entity",
  "@odata.type":"#microsoft.graph.itemAttachment",
  "id":"AAMkADA1MCJKtzmnlcqVgqI=",
  "lastModifiedDateTime":"2017-07-21T00:20:34Z",
  "name":"Reminder - please bring laptop",
  "contentType":null,
  "size":32005,
  "isInline":false,
  "item@odata.context":"https://graph.microsoft.com/v1.0/$metadata#users('d1a2fae9-db66-4cc9-8133-2184c77af1b8')/messages('AAMkADA1M-zAAA%3D')/attachments('AAMkADA1M-CJKtzmnlcqVgqI%3D')/microsoft.graph.itemAttachment/item/$entity",
  "item":{
    "@odata.type":"#microsoft.graph.message",
    "id":"",
    "createdDateTime":"2017-07-21T00:20:41Z",
    "lastModifiedDateTime":"2017-07-21T00:20:34Z",
    "receivedDateTime":"2017-07-21T00:19:55Z",
    "sentDateTime":"2017-07-21T00:19:52Z",
    "hasAttachments":false,
    "internetMessageId":"<BY2PR15MB05189A084C01F466709E414F9CA40@BY2PR15MB0518.namprd15.prod.outlook.com>",
    "subject":"Reminder - please bring laptop",
    "importance":"normal",
    "conversationId":"AAQkADA1MzMyOGI4LTlkZDctNDkzYy05M2RiLTdiN2E1NDE3MTRkOQAQAMG_NSCMBqdKrLa2EmR-lO0=",
    "isDeliveryReceiptRequested":false,
    "isReadReceiptRequested":false,
    "isRead":false,
    "isDraft":false,
    "webLink":"https://outlook.office365.com/owa/?ItemID=AAMkADA1M3MTRkOQAAAA%3D%3D&exvsurl=1&viewmodel=ReadMessageItem",
    "body":{
      "contentType":"html",
      "content":"<html><head>\r\n</head>\r\n<body>\r\n</body>\r\n</html>"
    },
    "sender":{
      "emailAddress":{
        "name":"Adele Vance",
        "address":"AdeleV@contoso.onmicrosoft.com"
      }
    },
    "from":{
      "emailAddress":{
        "name":"Adele Vance",
        "address":"AdeleV@contoso.onmicrosoft.com"
      }
    },
    "toRecipients":[
      {
        "emailAddress":{
          "name":"Alex Wilbur",
          "address":"AlexW@contoso.onmicrosoft.com"
        }
      }
    ],
    "ccRecipients":[
      {
        "emailAddress":{
          "name":"Adele Vance",
          "address":"AdeleV@contoso.onmicrosoft.com"
        }
      }
    ]
  }
}

来源：https ://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/attachment_get#request-2