rewrite number whatever to .net and blazor.
This commit is contained in:
Blake Ridgway
98
Services/EmailService.cs
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98
Services/EmailService.cs
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using System.Net.Security;
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using MailKit.Net.Smtp;
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using MailKit.Security;
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using MimeKit;
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namespace landing.Services;
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public class EmailService
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{
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private readonly IConfiguration _config;
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private readonly ILogger<EmailService> _logger;
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public EmailService(IConfiguration config, ILogger<EmailService> logger)
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{
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_config = config;
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_logger = logger;
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}
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public async Task SendConfirmationEmailAsync(string email, string unsubscribeLink)
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{
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var subject = "Thanks for subscribing!";
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var htmlBody = $@"
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<html>
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<body>
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<h1>Welcome to RideAware!</h1>
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<p>Thank you for subscribing to our newsletter.</p>
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<p><a href=""{System.Net.WebUtility.HtmlEncode(unsubscribeLink)}"">Unsubscribe</a></p>
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</body>
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</html>";
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await SendEmailAsync(email, subject, htmlBody);
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}
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public async Task SendContactConfirmationAsync(string email, string name)
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{
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var subject = "We received your message - RideAware";
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var escapedName = System.Net.WebUtility.HtmlEncode(name);
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var htmlBody = $@"
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<html>
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<body>
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<h2>Thank you for reaching out, {escapedName}!</h2>
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<p>We've received your message and will get back to you as soon as possible.</p>
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<p>In the meantime, feel free to check out more about RideAware on our website.</p>
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<p>Best regards,<br>The RideAware Team</p>
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</body>
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</html>";
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await SendEmailAsync(email, subject, htmlBody);
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}
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public async Task SendContactNotificationAsync(string adminEmail, string name, string email, string contactSubject, string message)
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{
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var emailSubject = $"New contact message from {name}";
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var escapedName = System.Net.WebUtility.HtmlEncode(name);
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var escapedEmail = System.Net.WebUtility.HtmlEncode(email);
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var escapedSubject = System.Net.WebUtility.HtmlEncode(contactSubject);
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var escapedMessage = System.Net.WebUtility.HtmlEncode(message).Replace("\n", "<br>");
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var htmlBody = $@"
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<html>
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<body>
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<h3>New Contact Message</h3>
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<p><strong>From:</strong> {escapedName} ({escapedEmail})</p>
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<p><strong>Subject:</strong> {escapedSubject}</p>
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<h4>Message:</h4>
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<p>{escapedMessage}</p>
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</body>
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</html>";
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await SendEmailAsync(adminEmail, emailSubject, htmlBody);
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}
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private async Task SendEmailAsync(string toEmail, string subject, string htmlBody)
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{
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var smtpHost = _config["SMTP_SERVER"] ?? throw new InvalidOperationException("SMTP_SERVER not configured");
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var smtpPort = int.Parse(_config["SMTP_PORT"] ?? "465");
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var smtpUser = _config["SMTP_USER"] ?? throw new InvalidOperationException("SMTP_USER not configured");
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var smtpPass = _config["SMTP_PASSWORD"] ?? throw new InvalidOperationException("SMTP_PASSWORD not configured");
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var message = new MimeMessage();
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message.From.Add(MailboxAddress.Parse(smtpUser));
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message.To.Add(MailboxAddress.Parse(toEmail));
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message.Subject = subject;
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message.Body = new TextPart("html") { Text = htmlBody };
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using var client = new SmtpClient();
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// Accept the server's certificate (matching Go's TLS behavior)
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client.ServerCertificateValidationCallback = (sender, certificate, chain, errors) =>
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errors == SslPolicyErrors.None || errors == SslPolicyErrors.RemoteCertificateChainErrors;
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// Port 465 uses direct SSL/TLS (SslOnConnect)
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await client.ConnectAsync(smtpHost, smtpPort, SecureSocketOptions.SslOnConnect);
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await client.AuthenticateAsync(smtpUser, smtpPass);
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await client.SendAsync(message);
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await client.DisconnectAsync(true);
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}
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}
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221
Services/SpamDetectionService.cs
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221
Services/SpamDetectionService.cs
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using System.Text.RegularExpressions;
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namespace landing.Services;
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public class SpamDetectionService
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{
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private static readonly string[] SpamPatterns =
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{
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"viagra", "cialis", "casino", "lottery", "prize",
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"click here", "buy now", "limited time",
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"congratulations", "you have won", "claim your",
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"bitcoin", "crypto", "forex", "trading bot",
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"free money", "make money fast", "work from home",
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"nigerian", "inheritance", "transfer funds",
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"<!--", "javascript:", "onclick=", "<script",
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"sveiki", "ciao", "hola", "\u043f\u0440\u0438\u0432\u0435\u0442",
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"harga", "karna", "anda", "dari",
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"toughalia", "comfythings",
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"robertgok"
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};
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private static readonly string[] EnglishWords =
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{
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"the", "and", "is", "to", "of", "for", "that", "with", "this", "have",
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"from", "be", "are", "was", "were", "been", "i", "you", "he", "she",
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"we", "they", "my", "your", "his", "her", "it", "what", "which", "who",
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"when", "where", "why", "how", "can", "will", "would", "should", "could",
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"do", "does", "did", "get", "got", "go", "going", "make", "made", "know",
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"think", "want", "need", "like", "help", "work", "use", "ask", "say", "tell",
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"give", "find", "tell", "become", "leave", "feel", "try", "ask", "need",
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"meet", "include", "continue", "set", "learn", "change", "lead", "understand"
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};
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private static readonly HashSet<string> CommonPairs = new()
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{
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"th", "he", "in", "er", "an",
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"ed", "nd", "to", "en", "ti",
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"es", "or", "te", "ar", "ou",
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"it", "ha", "is", "co", "me",
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"we", "be", "se", "as", "de",
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"so", "re", "st", "up", "at",
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"ai", "al", "il", "le", "li"
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};
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private static readonly HashSet<string> ValidSubjects = new()
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{
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"general", "support", "partnership", "feedback", "other"
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};
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private static readonly Regex UrlRegex = new(@"https?://", RegexOptions.Compiled);
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private static readonly Regex EmailRegex = new(@"[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}", RegexOptions.Compiled);
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private static readonly Regex PhoneRegex = new(@"\+?[0-9]{7,}", RegexOptions.Compiled);
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public bool IsValidName(string name)
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{
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if (name.Length < 2 || name.Length > 100)
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return false;
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int numberCount = name.Count(char.IsDigit);
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if (numberCount > 0 && (double)numberCount / name.Length > 0.33)
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return false;
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if (name.Contains("http") || name.Contains("://"))
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return false;
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return true;
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}
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public bool IsValidEmail(string email)
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{
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if (!email.Contains('@') || !email.Contains('.'))
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return false;
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var parts = email.Split('@');
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if (parts.Length != 2)
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return false;
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if (parts[0].Length < 1 || parts[0].Length > 64)
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return false;
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if (parts[1].Length < 3 || parts[1].Length > 255)
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return false;
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var domainParts = parts[1].Split('.');
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if (domainParts.Length < 2)
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return false;
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foreach (var label in domainParts)
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{
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if (label.Length < 1 || label.Length > 63)
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return false;
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}
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return true;
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}
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public bool IsValidSubject(string subject) => ValidSubjects.Contains(subject);
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public bool IsEnglishText(string text)
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{
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if (string.IsNullOrEmpty(text))
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return true;
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var lowerText = text.ToLowerInvariant();
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var words = lowerText.Split(
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new[] { ' ', '\t', '\n', '\r', '.', ',', '!', '?', ';', ':', '-', '(', ')', '[', ']', '{', '}', '"', '\'' },
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StringSplitOptions.RemoveEmptyEntries
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);
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int englishWordCount = 0;
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int totalWords = 0;
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foreach (var word in words)
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{
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if (word.Length == 0) continue;
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totalWords++;
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if (EnglishWords.Contains(word))
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englishWordCount++;
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}
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if (text.Length < 50)
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return englishWordCount >= 1;
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if (text.Length < 200)
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return englishWordCount >= 2;
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if (totalWords > 0)
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return (double)englishWordCount / totalWords >= 0.1;
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return true;
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}
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public bool IsSpamMessage(string message)
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{
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var lowerMsg = message.ToLowerInvariant();
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// Check spam keywords
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foreach (var pattern in SpamPatterns)
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{
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if (lowerMsg.Contains(pattern))
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return true;
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}
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// Check for excessive URLs
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if (UrlRegex.Matches(lowerMsg).Count > 1)
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return true;
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// Check for email addresses in message
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if (EmailRegex.IsMatch(lowerMsg))
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return true;
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// Check for phone numbers
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if (PhoneRegex.IsMatch(lowerMsg))
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return true;
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// Check for excessive exclamation marks
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if (lowerMsg.Count(c => c == '!') > 2)
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return true;
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// Check for repeated characters
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if (lowerMsg.Contains("!!!") || lowerMsg.Contains("???") || lowerMsg.Contains("..."))
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return true;
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// Check for all caps
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if (lowerMsg.Length > 20)
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{
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int letterCount = 0;
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int capsCount = 0;
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foreach (var c in message)
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{
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if (char.IsLetter(c))
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{
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letterCount++;
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if (char.IsUpper(c))
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capsCount++;
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}
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}
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if (letterCount > 0 && (double)capsCount / letterCount > 0.6)
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return true;
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}
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// Check for repeated words
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var words = lowerMsg.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (words.Length > 5)
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{
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var wordCount = new Dictionary<string, int>();
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foreach (var word in words)
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{
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wordCount.TryGetValue(word, out int count);
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wordCount[word] = count + 1;
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}
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if (wordCount.Values.Any(c => c > 3))
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return true;
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}
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// Check message length - very short messages are often spam
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if (message.Length < 15)
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return true;
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// Check for gibberish - high ratio of uncommon character transitions
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int uncommonCount = 0;
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for (int i = 0; i < lowerMsg.Length - 1; i++)
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{
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char c = lowerMsg[i];
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char next = lowerMsg[i + 1];
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if (c >= 'a' && c <= 'z' && next >= 'a' && next <= 'z')
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{
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var pair = new string(new[] { c, next });
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if (!CommonPairs.Contains(pair) && c != next)
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uncommonCount++;
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}
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}
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if (lowerMsg.Length > 30 && uncommonCount > lowerMsg.Length / 3)
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return true;
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return false;
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}
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}
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