1 files changed, 101 insertions, 0 deletions
diff --git a/code/api/src/Services/PasswordResetService.cs b/code/api/src/Services/PasswordResetService.cs
new file mode 100644
index 0000000..4c00b81
--- /dev/null
+++ b/code/api/src/Services/PasswordResetService.cs
@@ -0,0 +1,101 @@
+namespace IOL.GreatOffice.Api.Services;
+
+public class PasswordResetService
+{
+    private readonly MainAppDatabase _database;
+    private readonly MailService _mailService;
+    private readonly AppConfiguration _configuration;
+    private readonly ILogger<PasswordResetService> _logger;
+    private readonly IStringLocalizer<SharedResources> _localizer;
+
+    public PasswordResetService(
+        MainAppDatabase database,
+        VaultService vaultService,
+        ILogger<PasswordResetService> logger,
+        MailService mailService, IStringLocalizer<SharedResources> localizer) {
+        _database = database;
+        _configuration = vaultService.GetCurrentAppConfiguration();
+        _logger = logger;
+        _mailService = mailService;
+        _localizer = localizer;
+    }
+
+    public async Task<PasswordResetRequest> GetRequestAsync(Guid id, CancellationToken cancellationToken = default) {
+        var request = await _database.PasswordResetRequests
+            .Include(c => c.User)
+            .SingleOrDefaultAsync(c => c.Id == id, cancellationToken);
+        if (request == default) {
+            return default;
+        }
+
+        _logger.LogInformation($"Found password reset request for user: {request.User.Username}, expires at {request.ExpirationDate} (in {request.ExpirationDate.Subtract(AppDateTime.UtcNow).Minutes} minutes).");
+        return request;
+    }
+
+    public async Task<FulfillPasswordResetRequestResult> FulfillRequestAsync(Guid id, string newPassword, CancellationToken cancellationToken = default) {
+        var request = await GetRequestAsync(id, cancellationToken);
+        if (request == default) return FulfillPasswordResetRequestResult.REQUEST_NOT_FOUND;
+        var user = _database.Users.FirstOrDefault(c => c.Id == request.User.Id);
+        if (user == default) return FulfillPasswordResetRequestResult.USER_NOT_FOUND;
+        user.HashAndSetPassword(newPassword);
+        _database.Users.Update(user);
+        await _database.SaveChangesAsync(cancellationToken);
+        _logger.LogInformation($"Fullfilled password reset request for user: {request.User.Username}");
+        await DeleteRequestsForUserAsync(user.Id, cancellationToken);
+        return FulfillPasswordResetRequestResult.FULFILLED;
+    }
+
+    public async Task AddRequestAsync(User user, TimeZoneInfo requestTz, CancellationToken cancellationToken = default) {
+        await DeleteRequestsForUserAsync(user.Id, cancellationToken);
+        var request = new PasswordResetRequest(user);
+        _database.PasswordResetRequests.Add(request);
+        await _database.SaveChangesAsync(cancellationToken);
+        var zonedExpirationDate = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(request.ExpirationDate, requestTz.Id);
+        var message = new MailService.PostmarkEmail() {
+            To = request.User.Username,
+            Subject = _localizer["Reset password - Greatoffice"],
+            TextBody = _localizer["""
+Hi {0},
+
+Go to the following link to set a new password.
+
+{1}/reset-password/{2}
+
+The link expires at {3}.
+If you did not request a password reset, no action is required.
+""", user.DisplayName(true), _configuration.CANONICAL_FRONTEND_URL, request.Id, zonedExpirationDate.ToString("yyyy-MM-dd hh:mm")]
+        };
+
+#pragma warning disable 4014
+        Task.Run(() => {
+#pragma warning restore 4014
+                _mailService.SendMailAsync(message);
+                _logger.LogInformation($"Added password reset request for user: {request.User.Username}, expires in {request.ExpirationDate.Subtract(AppDateTime.UtcNow)}.");
+            },
+            cancellationToken);
+    }
+
+    public async Task DeleteRequestsForUserAsync(Guid userId, CancellationToken cancellationToken = default) {
+        var requestsToRemove = _database.PasswordResetRequests.Where(c => c.UserId == userId).ToList();
+        if (!requestsToRemove.Any()) return;
+        _database.PasswordResetRequests.RemoveRange(requestsToRemove);
+        await _database.SaveChangesAsync(cancellationToken);
+        _logger.LogInformation($"Deleted {requestsToRemove.Count} password reset requests for user: {userId}.");
+    }
+
+    public async Task DeleteStaleRequestsAsync(CancellationToken cancellationToken = default) {
+        var deleteCount = 0;
+        foreach (var request in _database.PasswordResetRequests.Where(c => c.IsExpired)) {
+            if (!request.IsExpired) {
+                continue;
+            }
+
+            _database.PasswordResetRequests.Remove(request);
+            deleteCount++;
+            _logger.LogInformation($"Marking password reset request with id: {request.Id} for deletion, expiration date was {request.ExpirationDate}.");
+        }
+
+        await _database.SaveChangesAsync(cancellationToken);
+        _logger.LogInformation($"Deleted {deleteCount} stale password reset requests.");
+    }
+}
+\ No newline at end of file