39 lines
1.4 KiB
C#
39 lines
1.4 KiB
C#
using MimeKit;
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using ScadaLink.Commons.Entities.Notifications;
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namespace ScadaLink.NotificationService;
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/// <summary>
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/// NS-008: Validates the sender and recipient email addresses before an SMTP
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/// delivery is attempted, so a malformed address surfaces as a clean error
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/// string rather than a <c>ParseException</c> escaping the delivery path.
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/// <para>
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/// Public so the central Notification Outbox's <c>EmailNotificationDeliveryAdapter</c>
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/// can share this exact pre-send validation rather than carry a divergent copy.
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/// </para>
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/// </summary>
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public static class EmailAddressValidator
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{
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/// <summary>
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/// Validates the sender and recipient email addresses, returning a
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/// human-readable error string if any is malformed, or null if all parse.
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/// </summary>
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public static string? ValidateAddresses(
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string fromAddress, IReadOnlyList<NotificationRecipient> recipients)
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{
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if (!MailboxAddress.TryParse(fromAddress, out _))
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{
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return $"Invalid sender (from) email address: '{fromAddress}'";
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}
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var invalid = recipients
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.Where(r => !MailboxAddress.TryParse(r.EmailAddress, out _))
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.Select(r => r.EmailAddress)
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.ToList();
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return invalid.Count > 0
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? $"Invalid recipient email address(es): {string.Join(", ", invalid)}"
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: null;
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}
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}
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