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POAuthorizing with stored credentials. Google Drive API for .NET
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  1. POAuthorizing with stored credentials. Google Drive API for .NET
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    copied!<p>I'm trying to create desktop application which will allow to list files and folders on google drive account. On this momment I'm able to do it but there is a one issue. I have to re-login each time I want to open google drive account from my application. Is it possible to use stored locally AccessToken/Refresh tokens in order to avoid re-authorization each time?</p> <p>Here method which is used to get authorization. </p> <pre><code>private IAuthorizationState GetAuthorization(NativeApplicationClient arg) { IAuthorizationState state = new AuthorizationState(new[] { "https://www.googleapis.com/auth/drive.file", "https://www.googleapis.com/auth/drive", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile" }); // Get the auth URL: state.Callback = new Uri("urn:ietf:wg:oauth:2.0:oob"); UriBuilder builder = new UriBuilder(arg.RequestUserAuthorization(state)); NameValueCollection queryParameters = HttpUtility.ParseQueryString(builder.Query); queryParameters.Set("access_type", "offline"); queryParameters.Set("approval_prompt", "force"); queryParameters.Set("user_id", email); builder.Query = queryParameters.ToString(); //Dialog window wich returns authcode GoogleWebBrowserAuthenticator a = new GooogleWebBrowserAuthenticator(builder.Uri.ToString()); a.ShowDialog(); //Request authorization from the user (by opening a browser window): string authCode = a.authCode; // Retrieve the access token by using the authorization code: return arg.ProcessUserAuthorization(authCode, state); } </code></pre> <p><strong>SOLVED:</strong></p> <p>In order to invoke methods from Google Drive sdk first you need to instance of service:</p> <pre><code> var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description, GoogleDriveHelper.CLIENT_ID, GoogleDriveHelper.CLIENT_SECRET); var auth = new OAuth2Authenticator&lt;NativeApplicationClient&gt;(provider, GetAuthorization); Service = new DriveService(auth); </code></pre> <p>Those CLIENT_ID and CLIENT_SECRET you will have after you sign up for application in Google API console.</p> <p>Then you need to define GetAuthorization routine, which might look as following:</p> <pre><code>private IAuthorizationState GetAuthorization(NativeApplicationClient arg) { IAuthorizationState state = new AuthorizationState(new[] { "https://www.googleapis.com/auth/drive.file", "https://www.googleapis.com/auth/drive", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile" }); state.Callback = new Uri("urn:ietf:wg:oauth:2.0:oob"); state.RefreshToken = AccountInfo.RefreshToken; state.AccessToken = AccountInfo.AccessToken; arg.RefreshToken(state); return state; } </code></pre> <p>It will works if you already have Refresh and Access tokens (at least Refresh). So you need to authorize for some user account first.</p> <p>Then you can use that Service instance to invoke sdk methods. Hope it will help someone.</p>
 

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