DocSpace-client/common/ASC.FederatedLogin/LoginProviders/DocuSignLoginProvider.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

namespace ASC.FederatedLogin.LoginProviders;

[Scope]
public class DocuSignLoginProvider : Consumer, IOAuthProvider
{
    public static string DocuSignLoginProviderScopes => "signature";
    public string Scopes => DocuSignLoginProviderScopes;
    public string CodeUrl => DocuSignHost + "/oauth/auth";
    public string AccessTokenUrl => DocuSignHost + "/oauth/token";
    public string RedirectUri => this["docuSignRedirectUrl"];
    public string ClientID => this["docuSignClientId"];
    public string ClientSecret => this["docuSignClientSecret"];
    public string DocuSignHost => "https://" + this["docuSignHost"];
    public bool IsEnabled
    {
        get
        {
            return !string.IsNullOrEmpty(ClientID) &&
                   !string.IsNullOrEmpty(ClientSecret) &&
                   !string.IsNullOrEmpty(RedirectUri);
        }
    }
    private string AuthHeader
    {
        get
        {
            var codeAuth = $"{ClientID}:{ClientSecret}";
            var codeAuthBytes = Encoding.UTF8.GetBytes(codeAuth);
            var codeAuthBase64 = Convert.ToBase64String(codeAuthBytes);

            return "Basic " + codeAuthBase64;
        }
    }

    public DocuSignLoginProvider() { }

    public DocuSignLoginProvider(
        TenantManager tenantManager,
        CoreBaseSettings coreBaseSettings,
        CoreSettings coreSettings,
        IConfiguration configuration,
        ICacheNotify<ConsumerCacheItem> cache,
        ConsumerFactory consumerFactory,
        string name, int order, Dictionary<string, string> props, Dictionary<string, string> additional = null)
        : base(tenantManager, coreBaseSettings, coreSettings, configuration, cache, consumerFactory, name, order, props, additional)
    {
    }

    public OAuth20Token GetAccessToken(string authCode)
    {
        if (string.IsNullOrEmpty(authCode))
        {
            throw new ArgumentNullException(nameof(authCode));
        }

        if (string.IsNullOrEmpty(ClientID))
        {
            throw new ArgumentException(nameof(ClientID));
        }

        if (string.IsNullOrEmpty(ClientSecret))
        {
            throw new ArgumentException(nameof(ClientSecret));
        }

        var data = $"grant_type=authorization_code&code={authCode}";
        var headers = new Dictionary<string, string> { { "Authorization", AuthHeader } };

        var json = RequestHelper.PerformRequest(AccessTokenUrl, "application/x-www-form-urlencoded", "POST", data, headers);
        if (json == null)
        {
            throw new Exception("Can not get token");
        }

        if (!json.StartsWith('{'))
        {
            json = "{\"" + json.Replace("=", "\":\"").Replace("&", "\",\"") + "\"}";
        }

        var token = OAuth20Token.FromJson(json);
        if (token == null)
        {
            return null;
        }

        token.ClientID = ClientID;
        token.ClientSecret = ClientSecret;
        token.RedirectUri = RedirectUri;

        return token;
    }

    public OAuth20Token RefreshToken(string refreshToken)
    {
        if (string.IsNullOrEmpty(refreshToken) || string.IsNullOrEmpty(ClientID) || string.IsNullOrEmpty(ClientSecret))
        {
            throw new ArgumentException("Can not refresh given token");
        }

        var data = $"grant_type=refresh_token&refresh_token={refreshToken}";
        var headers = new Dictionary<string, string> { { "Authorization", AuthHeader } };

        var json = RequestHelper.PerformRequest(AccessTokenUrl, "application/x-www-form-urlencoded", "POST", data, headers);
        if (json == null)
        {
            throw new Exception("Can not get token");
        }

        var refreshed = OAuth20Token.FromJson(json);
        refreshed.ClientID = ClientID;
        refreshed.ClientSecret = ClientSecret;
        refreshed.RedirectUri = RedirectUri;
        refreshed.RefreshToken ??= refreshToken;

        return refreshed;
    }
}