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172 lines
5.3 KiB
C#
172 lines
5.3 KiB
C#
// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System.Diagnostics;
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using osu.Framework.IO.Network;
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namespace osu.Game.Online.API
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{
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internal class OAuth
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{
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private readonly string clientId;
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private readonly string clientSecret;
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private readonly string endpoint;
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public OAuthToken Token;
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internal OAuth(string clientId, string clientSecret, string endpoint)
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{
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Debug.Assert(clientId != null);
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Debug.Assert(clientSecret != null);
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Debug.Assert(endpoint != null);
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this.clientId = clientId;
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this.clientSecret = clientSecret;
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this.endpoint = endpoint;
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}
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internal bool AuthenticateWithLogin(string username, string password)
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{
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using (var req = new AccessTokenRequestPassword(username, password)
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{
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Url = $@"{endpoint}/oauth/token",
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Method = HttpMethod.POST,
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ClientId = clientId,
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ClientSecret = clientSecret
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})
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{
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try
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{
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req.BlockingPerform();
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}
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catch
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{
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return false;
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}
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Token = req.ResponseObject;
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return true;
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}
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}
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internal bool AuthenticateWithRefresh(string refresh)
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{
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try
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{
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using (var req = new AccessTokenRequestRefresh(refresh)
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{
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Url = $@"{endpoint}/oauth/token",
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Method = HttpMethod.POST,
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ClientId = clientId,
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ClientSecret = clientSecret
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})
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{
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req.BlockingPerform();
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Token = req.ResponseObject;
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return true;
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}
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}
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catch
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{
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//todo: potentially only kill the refresh token on certain exception types.
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Token = null;
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return false;
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}
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}
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private static readonly object access_token_retrieval_lock = new object();
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/// <summary>
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/// Should be run before any API request to make sure we have a valid key.
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/// </summary>
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private bool ensureAccessToken()
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{
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// if we already have a valid access token, let's use it.
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if (accessTokenValid) return true;
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// we want to ensure only a single authentication update is happening at once.
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lock (access_token_retrieval_lock)
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{
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// re-check if valid, in case another request completed and revalidated our access.
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if (accessTokenValid) return true;
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// if not, let's try using our refresh token to request a new access token.
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if (!string.IsNullOrEmpty(Token?.RefreshToken))
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AuthenticateWithRefresh(Token.RefreshToken);
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return accessTokenValid;
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}
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}
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private bool accessTokenValid => Token?.IsValid ?? false;
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internal bool HasValidAccessToken => RequestAccessToken() != null;
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internal string RequestAccessToken()
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{
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if (!ensureAccessToken()) return null;
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return Token.AccessToken;
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}
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internal void Clear()
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{
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Token = null;
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}
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private class AccessTokenRequestRefresh : AccessTokenRequest
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{
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internal readonly string RefreshToken;
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internal AccessTokenRequestRefresh(string refreshToken)
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{
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RefreshToken = refreshToken;
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GrantType = @"refresh_token";
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}
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protected override void PrePerform()
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{
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Parameters[@"refresh_token"] = RefreshToken;
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base.PrePerform();
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}
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}
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private class AccessTokenRequestPassword : AccessTokenRequest
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{
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internal readonly string Username;
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internal readonly string Password;
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internal AccessTokenRequestPassword(string username, string password)
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{
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Username = username;
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Password = password;
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GrantType = @"password";
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}
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protected override void PrePerform()
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{
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Parameters[@"username"] = Username;
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Parameters[@"password"] = Password;
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base.PrePerform();
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}
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}
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private class AccessTokenRequest : JsonWebRequest<OAuthToken>
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{
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protected string GrantType;
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internal string ClientId;
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internal string ClientSecret;
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protected override void PrePerform()
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{
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Parameters[@"grant_type"] = GrantType;
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Parameters[@"client_id"] = ClientId;
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Parameters[@"client_secret"] = ClientSecret;
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base.PrePerform();
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}
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}
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}
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}
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