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copied!<p>Yahoo does use OAuth 1.0, so I figured out how to do it manually:</p> <p>First, I try to use the token I have saved in my database. If I get a 401 Unauthorized error, I call my RefreshYahooAccessToken() method, and try again.</p> <p>Note: I have my own implementation of a TokenManager that stores my access tokens in a database, as well as any extra data associated with the token (YahooGUID, and oauth_session_handle) which is given to me in Yahoo's get_token Response Parameters, but you can easily modify it to work with a different TokenManager implementation.</p> <p>Here's my working version:</p> <pre><code>try { request = yahoo.PrepareAuthorizedRequest(YahooContactsAPIEndpoint, TokenManager.currentToken.Token, extraData); response = yahoo.Channel.WebRequestHandler.GetResponse(request); body = response.GetResponseReader().ReadToEnd(); } catch (DotNetOpenAuth.Messaging.ProtocolException ex) { //is token expired? if (ex.InnerException is WebException && ((WebException)ex.InnerException).Response is HttpWebResponse && ((HttpWebResponse)((WebException)ex.InnerException).Response).StatusCode == HttpStatusCode.Unauthorized) { RefreshYahooAccessToken(); request = yahoo.PrepareAuthorizedRequest(YahooContactsAPIEndpoint, TokenManager.currentToken.Token, extraData); response = yahoo.Channel.WebRequestHandler.GetResponse(request); body = response.GetResponseReader().ReadToEnd(); } } private static void RefreshYahooAccessToken() { var request = (HttpWebRequest)WebRequest .Create("https://api.login.yahoo.com/oauth/v2/get_token" + "?oauth_consumer_key=" + TokenManager.ConsumerKey + "&oauth_nonce=" + (new Random()).Next(123400, 9999999).ToString() + "&oauth_session_handle=" + TokenManager.GetExtraData("oauth_session_handle") //this value is given to you in the get_token Response Parameters + "&oauth_signature=" + TokenManager.ConsumerSecret + "%26" + TokenManager.currentToken.Secret + "&oauth_signature_method=PLAINTEXT" + "&oauth_timestamp=" + (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0)).TotalSeconds.ToString().Split(new char[] { '.' })[0] + "&oauth_token=" + TokenManager.currentToken.Token + "&oauth_version=1.0"); try { var response = (HttpWebResponse)request.GetResponse(); var returnStr = new System.IO.StreamReader(response.GetResponseStream()).ReadToEnd(); var returnData = System.Web.HttpUtility.ParseQueryString(returnStr ?? string.Empty); TokenManager.ExpireRequestTokenAndStoreNewAccessToken(null, null, returnData["oauth_token"], returnData["oauth_token_secret"]); } catch (Exception) { //User probably revoked token. Clear the current token, and request authorization again } } </code></pre>

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