How would one implement a login method for Linkedin, so people can just click a button and use their Linkedin account to login, just like on Facebook or Twitter? Both use OAuth, but I found specified libraries for them which are dead simple to use. For Linkedin I only found some sample code in DotNetOpenAuth but I can't make any sense out of it.
Are there any libraries I can use to facilitate a login function for Linkedin? Or any tutorials on how to do that in ASP.NET MVC with DotNetOpenAuth 4?
Here's what looks to be a pretty solid sample
http://mrsarker.wordpress.com/2011/08/20/linkedin-rest-api-in-asp-net-mvc/
[HandleError]
public class LinkedInController : Controller
{
public ActionResult index()
{
return AuthenticateToLinkedIn();
}
static string token_secret = "";
public ActionResult AuthenticateToLinkedIn()
{
var credentials = new OAuthCredentials
{
CallbackUrl = "http://localhost/home/callback",
ConsumerKey = ConfigurationManager.AppSettings["ConsumerKey"],
ConsumerSecret = ConfigurationManager.AppSettings["ConsumerSecret"],
Verifier = "123456",
Type = OAuthType.RequestToken
};
var client = new RestClient { Authority = "https://api.linkedin.com/uas/oauth", Credentials = credentials };
var request = new RestRequest { Path = "requestToken" };
RestResponse response = client.Request(request);
token = response.Content.Split('&').Where(s => s.StartsWith("oauth_token=")).Single().Split('=')[1];
token_secret = response.Content.Split('&').Where(s => s.StartsWith("oauth_token_secret=")).Single().Split('=')[1];
Response.Redirect("https://api.linkedin.com/uas/oauth/authorize?oauth_token=" + token);
return null;
}
string token = "";
string verifier = "";
public ActionResult Callback()
{
token = Request["oauth_token"];
verifier = Request["oauth_verifier"];
var credentials = new OAuthCredentials
{
ConsumerKey = ConfigurationManager.AppSettings["ConsumerKey"],
ConsumerSecret = ConfigurationManager.AppSettings["ConsumerSecret"],
Token = token,
TokenSecret = token_secret,
Verifier = verifier,
Type = OAuthType.AccessToken,
ParameterHandling = OAuthParameterHandling.HttpAuthorizationHeader,
SignatureMethod = OAuthSignatureMethod.HmacSha1,
Version = "1.0"
};
var client = new RestClient { Authority = "https://api.linkedin.com/uas/oauth", Credentials = credentials, Method = WebMethod.Post };
var request = new RestRequest { Path = "accessToken" };
RestResponse response = client.Request(request);
string content = response.Content;
string accessToken = response.Content.Split('&').Where(s => s.StartsWith("oauth_token=")).Single().Split('=')[1];
string accessTokenSecret = response.Content.Split('&').Where(s => s.StartsWith("oauth_token_secret=")).Single().Split('=')[1];
var company = new LinkedInService(accessToken, accessTokenSecret).GetCompany(162479);
// Some commented call to API
//company = new LinkedInService(accessToken, accessTokenSecret).GetCompanyByUniversalName("linkedin");
// var companies = new LinkedInService(accessToken, accessTokenSecret).GetCompaniesByEmailDomain("apple.com");
// var companies1 = new LinkedInService(accessToken, accessTokenSecret).GetCompaniesByEmailDomain("linkedin.com");
// var companies2= new LinkedInService(accessToken, accessTokenSecret).GetCompaniesByIdAnduniversalName("162479", "linkedin");
//var people = new LinkedInService(accessToken, accessTokenSecret).GetPersonById("f7cp5sKscd");
//var people = new LinkedInService(accessToken, accessTokenSecret).GetCurrentUser();
//string url = Url.Encode("http://bd.linkedin.com/pub/rakibul-islam/37/522/653");
//var people = new LinkedInService(accessToken, accessTokenSecret).GetPeoPleByPublicProfileUrl(url);
//var peopleSearchresult = new LinkedInService(accessToken, accessTokenSecret).SearchPeopleByKeyWord("Princes");
var peopleSearchresult = new LinkedInService(accessToken, accessTokenSecret).GetPeopleByFirstName("Mizan");
String companyName = company.Name;
return Content(companyName);
}
}
public class LinkedInService
{
private const string URL_BASE = "http://api.linkedin.com/v1";
public static string ConsumerKey { get { return ConfigurationManager.AppSettings["ConsumerKey"]; } }
public static string ConsumerKeySecret { get { return ConfigurationManager.AppSettings["ConsumerSecret"]; } }
public string AccessToken { get; set; }
public string AccessTokenSecret { get; set; }
public LinkedInService(string accessToken, string accessTokenSecret)
{
this.AccessToken = accessToken;
this.AccessTokenSecret = accessTokenSecret;
}
private OAuthCredentials AccessCredentials
{
get
{
return new OAuthCredentials
{
Type = OAuthType.AccessToken,
SignatureMethod = OAuthSignatureMethod.HmacSha1,
ParameterHandling = OAuthParameterHandling.HttpAuthorizationHeader,
ConsumerKey = ConsumerKey,
ConsumerSecret = ConsumerKeySecret,
Token = AccessToken,
TokenSecret = AccessTokenSecret
};
}
}
#region Helper
private RestResponse GetResponse(string path)
{
var client = new RestClient()
{
Authority = URL_BASE,
Credentials = AccessCredentials,
Method = WebMethod.Get
};
var request = new RestRequest { Path = path };
return client.Request(request);
}
private T Deserialize(string xmlContent)
{
MemoryStream memoryStream = new MemoryStream(Encoding.ASCII.GetBytes(xmlContent));
XmlSerializer deserializer = new XmlSerializer(typeof(T));
return (T)deserializer.Deserialize(new StringReader(xmlContent));
}
#endregion
// methods removed for brevity. check the original link for full source
}
If you don't want to code it yourself, you can always look into a third-party solution like Janrain's RPX solution: http://developers.janrain.com/. It will give you LinkedIn sign-in plus many more.
