c# - OpenID：尝试从 Google OP 获取电子邮件地址

Question

我正在使用 dotnetopenauth 3.2 来实现 Openid，但无法弄清楚如何让 Google 在声明响应中传递电子邮件地址。我知道谷歌不支持简单的注册，但我无法确定他们支持什么。

对这个问题的警告是，我刚开始学习 OpenID，我知道我对规范没有扎实的掌握，我认为这会导致我的困惑。

任何帮助，将不胜感激！

Answer 1

好的，想通了。我在Goolge 的 Federated Log API 组上发布了一个问题，并被告知使用Attribute exchange。

下面是DotNetOpenAuth的代码。

请不要在生产中使用此代码。这仅用于说明目的！

请求：

using (OpenIdRelyingParty openid = new OpenIdRelyingParty())
{
    IAuthenticationRequest request = openid.CreateRequest(openidurl);

    var fetch = new FetchRequest();
    fetch.Attributes.AddRequired(WellKnownAttributes.Contact.Email);
    request.AddExtension(fetch);

    // Send your visitor to their Provider for authentication.
    request.RedirectToProvider();
}

响应：

OpenIdRelyingParty openid = new OpenIdRelyingParty();
var response = openid.GetResponse();
if (response != null)
{
    switch (response.Status)
    {
        case AuthenticationStatus.Authenticated:
        {
            var fetch = response.GetExtension<FetchResponse>();
            string email = string.Empty();
            if (fetch != null)
            {
                email =  fetch.GetAttributeValue(
                    WellKnownAttributes.Contact.Email);
            }

            FormsAuthentication.RedirectFromLoginPage(
                response.ClaimedIdentifier, false);
            break;
        }
        ...
    }
}

Answer 2

当我尝试获取全名时，响应为空，请提供获取全名的解决方案，这篇文章真的很有帮助，谢谢。我的示例代码是这样的。

var fetch = new FetchRequest();
            fetch.Attributes.AddRequired(WellKnownAttributes.Contact.Email);
            fetch.Attributes.AddRequired(WellKnownAttributes.Name.FullName);
            fetch.Attributes.AddRequired(WellKnownAttributes.Company.CompanyName);
            //fetch.Attributes.AddRequired(WellKnownAttributes.Contact.Email);

            request.AddExtension(fetch);

和

if (fetch != null)
         {
             email = fetch.GetAttributeValue(WellKnownAttributes.Contact.Email);
             name = fetch.GetAttributeValue(WellKnownAttributes.Name.FullName);
             company = fetch.GetAttributeValue(WellKnownAttributes.Company.CompanyName);
         }