mirror of
https://github.com/streetwriters/notesnook-sync-server.git
synced 2026-05-16 04:29:02 +02:00
Abdullah Atta
20eec79cef
while this is not a perfect way to prevent abuse of service, we do want to avoid getting spammed with fake accounts. Creating a valid email account is significantly more cumbersome than using a disposable email address. Currently the list of blacklisted domains is extracted from https://github.com/disposable/disposable and it is refreshed after every 24 hours.
36 lines
1.3 KiB
C#
36 lines
1.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Net.Http;
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using System.Threading.Tasks;
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using Streetwriters.Common;
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namespace Streetwriters.Identity.Services
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{
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public class EmailAddressValidator
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{
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private static DateTimeOffset LAST_FETCH_TIME = DateTimeOffset.MinValue;
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private static HashSet<string> BLACKLISTED_DOMAINS = new HashSet<string>();
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public static async Task<bool> IsEmailAddressValidAsync(string email)
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{
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var domain = email.ToLowerInvariant().Split("@")[1];
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try
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{
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if (LAST_FETCH_TIME.AddDays(1) < DateTimeOffset.UtcNow)
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{
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var httpClient = new HttpClient();
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var domainsList = await httpClient.GetStringAsync("https://disposable.github.io/disposable-email-domains/domains.txt");
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BLACKLISTED_DOMAINS = new HashSet<string>(domainsList.Split('\n'));
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LAST_FETCH_TIME = DateTimeOffset.UtcNow;
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}
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return !BLACKLISTED_DOMAINS.Contains(domain);
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}
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catch (Exception ex)
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{
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await Slogger<EmailAddressValidator>.Error("IsEmailAddressValidAsync", ex.ToString());
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return BLACKLISTED_DOMAINS.Count > 0 ? !BLACKLISTED_DOMAINS.Contains(domain) : true;
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}
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}
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}
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} |