如何在sharepoint 2013中获取oauth访问令牌？

POST /_api/SP.OAuth.Token/Acquire?realm=<realm> HTTP/1.1
Host: <your_sharepoint_site>
Content-Type: application/x-www-form-urlencoded
Content-Length:<content_length>

grant_type=client_credentials&client_id=<client_id>&client_secret=<client_secret>&resource=<resource>

HTTP/1.1 200 OK
Content-Type: application/json;odata=verbose;charset=utf-8

{
  "odata.metadata":"https://<your_sharepoint_site>/_api/$metadata#SP.OAuth.TokenResponse",
  "value":{
    "access_token":"<access_token>",
    "expires_in":"3600",
    "scope":"All",
    "token_type":"Bearer"
  }
}

GET /_api/web/lists HTTP/1.1
Host: <your_sharepoint_site>
Authorization: Bearer<access_token>