我正在尝试从我的c＃asp.net应用程序连接到gotowebinar REST服务，这需要oauth2。不幸的是我不能使用dotnetopenauth。有没有人有关于如何对gotowebinar进行身份验证的简单c＃代码示例？
我已经看到了其他一些oauth2 API，但大多数似乎都没有记录。
答案 0 :(得分：4)
我建议使用dotnetopenauth。
遗憾的是，由于项目限制，我无法使用它，所以这里是我工作代码的一个片段。我删除了一些专有代码，试图让它更容易阅读和使用。如果有人有任何疑问，请告诉我，我会看看能否提供帮助。
/// <summary>
/// Summary description for GoToWebinarProvider
/// </summary>
public class GoToWebinarProvider
{
#region properties
private GoToWebinarAccessToken _accessToken;
private readonly string _apiKey = "apikey";
/// <summary>
/// Use for debugging purposes
/// </summary>
private const bool EnableCaching = true;
private const string G2WApiDateTimeFormat = "yyyy-MM-ddTHH:mm:ssZ";
#endregion properties
#region token management
private void OAuthenticate()
{
GoToWebinarAccessToken localToken = null;
//try to get access token from cache
if (EnableCaching)
{
localToken = GetTokenFromDb();
//cache it here
}
else
{
_accessToken = GetTokenFromDb();
}
//if the token hasn't expired yet, we have an access token, so instantiation is complete
if (_accessToken != null && _accessToken.ExpirationDate > DateTime.Now)
{
return;
}
//else get new token
var responseKey = GetResponseKey();
if (responseKey != null)
{
_accessToken = GetAccessToken(responseKey);
if (_accessToken != null)
{
StoreTokenInDb(_accessToken);
}
else
{
throw new Exception("Could not acquire access token from GoToWebinar");
}
}
else
{
throw new Exception("Could not acquire response key from GoToWebinar");
}
}
private GoToWebinarAccessToken GetAccessToken(string responseKey)
{
var url =
String.Format(
"https://api.citrixonline.com/oauth/access_token?grant_type=authorization_code&code={0}&client_id={1}",
responseKey, _apiKey);
const string applicationJSON = "application/json; charset=UTF-8";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ProtocolVersion = HttpVersion.Version11;
httpWebRequest.Method = "GET";
httpWebRequest.Accept = applicationJSON;
try
{
var response = httpWebRequest.GetResponse();
//will throw error if not 200 response
using (var dataStream = response.GetResponseStream())
{
var responseText = dataStream != null ? new StreamReader(dataStream).ReadToEnd() : String.Empty;
var jsSerializer = new JavaScriptSerializer();
var accessToken = jsSerializer.Deserialize(responseText, typeof(GoToWebinarAccessToken)) as GoToWebinarAccessToken;
//pad it by a minute. took time to calculate it, and each request will have latency in getting to gotowebinar
accessToken.ExpirationDate = DateTime.Now.AddSeconds(Convert.ToDouble(accessToken.Expires_In)).AddMinutes(-1);
return accessToken;
}
}
catch (Exception ex)
{
return null;
}
}
private string GetResponseKey()
{
var redirectURL = HttpContext.Current.Server.UrlEncode("http://mysite.net/Welcome.aspx");
var requestURL =
String.Format("https://api.citrixonline.com/oauth/authorize?client_id={0}&redirect_uri={1}", _apiKey,
redirectURL);
var request = CreateWebRequest(requestURL, "GET");
try
{
//first request
var response = request.GetResponse();
//will throw error if not 200 response
using (var dataStream = response.GetResponseStream())
{
var responseText = dataStream != null ? new StreamReader(dataStream).ReadToEnd() : String.Empty;
return Login(redirectURL);
}
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
/// Should only be called by GetResponseKey
/// </summary>
/// <param name="urlEncodedRedirect"></param>
private string Login(string urlEncodedRedirect)
{
var elp = new EventLogProvider();
var userName = HttpContext.Current.Server.UrlEncode(SettingsKeyProvider.GetSettingsKeyInfo("GoToWebinarUserEmail").KeyValue);
var password = HttpContext.Current.Server.UrlEncode(SettingsKeyProvider.GetSettingsKeyInfo("GoToWebinarUserPassword").KeyValue);
var postData = String.Format(
"emailAddress={0}&password={1}&client_id={2}&access_type=G2W&app_name=MyApp&redirect_url={3}&submitted=form_submitted&submit=Log+In",
userName, password, _apiKey, urlEncodedRedirect);
var request = CreateWebRequest("https://developer.citrixonline.com/oauth/g2w/authorize.php", "POST",
postData, "application/x-www-form-urlencoded");
request.AllowAutoRedirect = false;
var response = request.GetResponse();
using (var dataStream = response.GetResponseStream())
{
var responseText = dataStream != null ? new StreamReader(dataStream).ReadToEnd() : String.Empty;
const string locationHeader = "location";
if (!String.IsNullOrWhiteSpace(response.Headers.Get(locationHeader)))
{
//get redirect to login page
var locationRedirect = response.Headers.Get(locationHeader);
elp.LogEvent("I", DateTime.Now, GetType().Name, "GoToWebinar",
HttpContext.Current.Request.Url.ToString(), locationRedirect);
const string comparator = "code=";
var index = locationRedirect.IndexOf(comparator, StringComparison.OrdinalIgnoreCase);
if (index != -1)
{
return locationRedirect.Substring(index + comparator.Length);
}
throw new Exception("Could not parse response code: " + locationRedirect);
}
throw new Exception("Did not receive redirect: ", new Exception(responseText));
}
}
private static GoToWebinarAccessToken GetTokenFromDb()
{
//return token
}
private static void StoreTokenInDb(GoToWebinarAccessToken accessToken)
{
//store token
}
#endregion token management
#region api calls
public IList<GoToWebinarWebinar> GetWebinars()
{
if (_accessToken == null || _accessToken.ExpirationDate < DateTime.Now)
{
OAuthenticate();
}
var serviceEndPoint = String.Format("https://api.citrixonline.com/G2W/rest/organizers/{0}/webinars", _accessToken.Organizer_Key);
try
{
var httpWebRequest = CreateJSONRequest(serviceEndPoint, "GET", null);
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var httpResponseStream = httpResponse.GetResponseStream())
{
if (httpResponseStream != null)
{
using (var streamReader = new StreamReader(httpResponseStream))
{
var responseText = streamReader.ReadToEnd();
var jsSerializer = new JavaScriptSerializer();
var gotoWebinarList = jsSerializer.Deserialize<IList<GoToWebinarWebinar>>(responseText);
return gotoWebinarList;
}
}
}
}
catch (Exception ex)
{
//log it
}
return null;
}
#endregion api calls
#region web requests
private HttpWebRequest CreateJSONRequest(string serviceEndPoint, string httpMethod, string postData)
{
const string applicationJSON = "application/json";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(serviceEndPoint);
httpWebRequest.ProtocolVersion = HttpVersion.Version11;
httpWebRequest.Method = httpMethod;
httpWebRequest.Accept = String.Format("{0}, application/vnd.citrix.g2wapi-v1.1+json", applicationJSON);
httpWebRequest.ContentType = applicationJSON;
httpWebRequest.Headers.Add(HttpRequestHeader.Authorization, _accessToken.Access_Token);
if (httpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
{
var encoding = new ASCIIEncoding();
var body = encoding.GetBytes(postData);
httpWebRequest.ContentLength = body.Length;
using (var newStream = httpWebRequest.GetRequestStream())
{
newStream.Write(body, 0, body.Length);
newStream.Close();
}
}
return httpWebRequest;
}
private static HttpWebRequest CreateWebRequest(string serviceEndPoint, string httpMethod)
{
//const string applicationJSON = "application/json";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(serviceEndPoint);
httpWebRequest.ProtocolVersion = HttpVersion.Version11;
httpWebRequest.Method = httpMethod;
//httpWebRequest.Accept = String.Format("{0}, application/vnd.citrix.g2wapi-v1.1+json", applicationJSON);
//httpWebRequest.ContentType = applicationJSON;
//httpWebRequest.Headers.Add(HttpRequestHeader.Authorization, _accessToken);
return httpWebRequest;
}
private static HttpWebRequest CreateWebRequest(string serviceEndPoint, string httpMethod, string postData, string contentType)
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(serviceEndPoint);
httpWebRequest.ProtocolVersion = HttpVersion.Version11;
httpWebRequest.Method = httpMethod;
if (contentType != null)
{
httpWebRequest.ContentType = contentType;
}
if (httpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
{
var encoding = new ASCIIEncoding();
var body = encoding.GetBytes(postData);
httpWebRequest.ContentLength = body.Length;
using (var newStream = httpWebRequest.GetRequestStream())
{
newStream.Write(body, 0, body.Length);
newStream.Close();
}
}
return httpWebRequest;
}
#endregion web requests
private void LogRequest(string methodName, string dataToLog)
{
//log it
}
/// <summary>
/// Syntax matches JSON response
/// </summary>
private class GoToWebinarAccessToken
{
public string Access_Token;
public string Refresh_Token;
public string Organizer_Key;
public string Account_Key;
public double? Expires_In;
public DateTime ExpirationDate;
}
}