Google联系人API：如何重复使用授权码？

Question

我使用以下代码成功获取联系人：

Dim parameters = New OAuth2Parameters()
parameters.ClientId = "XXX.apps.googleusercontent.com"
parameters.ClientSecret = "XXXX"
parameters.RedirectUri = "urn:ietf:wg:oauth:2.0:oob"
parameters.Scope = "https://www.google.com/m8/feeds"

Dim authorizationUrl As String = OAuthUtil.CreateOAuth2AuthorizationUrl(parameters)
Process.Start(authorizationUrl)
Dim authCode As String = InputBox("Authorisation code", "Authorisation Code", "")
parameters.AccessCode = authCode

OAuthUtil.GetAccessToken(parameters)
Dim accessToken = parameters.AccessToken

Dim settings = New RequestSettings("my app name")
Dim cr  = New ContactsRequest(settings)
Dim contcts = cr.GetContacts()

我的问题是：

我怎样才能以某种方式保持跨会话的授权，这样我就不需要每隔几个小时就要求用户授权访问他的联系人列表？

Answer 1

我们可以使用旧的 Access-Token 和 Refresh-Token（第一次获得）

 Dim parameters = New OAuth2Parameters()
 parameters.ClientId = "XXXXX.apps.googleusercontent.com"
 parameters.ClientSecret = "XXXXXX"
 parameters.RedirectUri = "urn:ietf:wg:oauth:2.0:oob"
 parameters.Scope = "https://www.google.com/m8/feeds"
 parameters.ResponseType = "code"
 parameters.AccessToken = "",  /* use the value returned from the old call to GetAccessToken here */
 parameters.RefreshToken = "", /* use the value returned from the old call to GetAccessToken here */

OAuthUtil.RefreshAccessToken(parameters)

Google联系人API：如何重复使用授权码？

Google Contacts API: how to reuse authorization code?

.net

oauth-2.0

gdata

google-contacts-api