DocSpace-client/common/ASC.Api.Core/Security/DocSpaceLinksHelper.cs

// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
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using ValidationResult = ASC.Security.Cryptography.EmailValidationKeyProvider.ValidationResult;

namespace ASC.Api.Core.Security;

[Scope]
public class DocSpaceLinkHelper
{
    private readonly IDbContextFactory<MessagesContext> _dbContextFactory;
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly MessageService _messageService;
    private readonly MessageTarget _messageTarget;
    private readonly Signature _signature;
    private readonly EmailValidationKeyProvider _emailValidationKeyProvider;
    private readonly UserManager _userManager;
    private readonly AuthManager _authManager;

    public TimeSpan ExpirationInterval => _emailValidationKeyProvider.ValidEmailKeyInterval;
    public TimeSpan ExpirationVisitInterval => _emailValidationKeyProvider.ValidVisitLinkInterval;

    public DocSpaceLinkHelper(
        IHttpContextAccessor httpContextAccessor,
        MessageTarget messageTarget,
        MessageService messageService,
        Signature signature,
        IDbContextFactory<MessagesContext> dbContextFactory,
        EmailValidationKeyProvider emailValidationKeyProvider,
        UserManager userManager,
        AuthManager authManager)
    {
        _httpContextAccessor = httpContextAccessor;
        _messageTarget = messageTarget;
        _messageService = messageService;
        _dbContextFactory = dbContextFactory;
        _signature = signature;
        _emailValidationKeyProvider = emailValidationKeyProvider;
        _userManager = userManager;
        _authManager = authManager;
    }

    public string MakeKey(Guid linkId)
    {
        return _signature.Create(linkId);
    }

    public string MakeKey(string email, EmployeeType employeeType)
    {
        return email + ConfirmType.LinkInvite.ToStringFast() + employeeType.ToStringFast();
    }

    public Guid Parse(string key)
    {
        return _signature.Read<Guid>(key);
    }

    public ValidationResult Validate(string key, string email, EmployeeType employeeType)
    {
        return string.IsNullOrEmpty(email) ? ValidateRoomExternalLink(key) : ValidateEmailLink(email, key, employeeType);
    }

    public ValidationResult ValidateEmailLink(string email, string key, EmployeeType employeeType)
    {
        var result = _emailValidationKeyProvider.ValidateEmailKey(MakeKey(email, employeeType), key, ExpirationInterval);

        if (result == ValidationResult.Ok)
        {
            var user = _userManager.GetUserByEmail(email);

            if (user == ASC.Core.Users.Constants.LostUser || _authManager.GetUserPasswordStamp(user.Id) != DateTime.MinValue)
            {
                return ValidationResult.Invalid;
            }

            if (!CanUsed(email, key, ExpirationVisitInterval))
            {
                return ValidationResult.Expired;
            }
        }

        return result;
    }

    public ValidationResult ValidateRoomExternalLink(string key)
    {
        var payload = Parse(key);

        return payload == default ? ValidationResult.Invalid : ValidationResult.Ok;
    }

    public ValidationResult ValidateExtarnalLink(string key, EmployeeType employeeType)
    {
        return _emailValidationKeyProvider.ValidateEmailKey(ConfirmType.LinkInvite.ToStringFast() + (int)employeeType, key);
    }

    private bool CanUsed(string email, string key, TimeSpan interval)
    {
        var message = GetLinkInfo(email, key);

        if (message == null)
        {
            SaveVisitLinkInfo(email, key);

            return true;
        }

        return message.Date + interval > DateTime.UtcNow;
    }

    private AuditEvent GetLinkInfo(string email, string key)
    {
        using var context = _dbContextFactory.CreateDbContext();
        var target = _messageTarget.Create(email);
        var description = JsonConvert.SerializeObject(new[] { key },
            new JsonSerializerSettings
            {
                DateTimeZoneHandling = DateTimeZoneHandling.Utc
            });

        var message = context.AuditEvents.Where(a => a.Target == target.ToString() &&
            a.DescriptionRaw == description).FirstOrDefault();

        return message;
    }

    private void SaveVisitLinkInfo(string email, string key)
    {
        var headers = _httpContextAccessor?.HttpContext?.Request?.Headers;
        var target = _messageTarget.Create(email);

        _messageService.Send(headers, MessageAction.RoomInviteLinkUsed, target, key);
    }
}