Chris Chen
41 lines
1.8 KiB
C#
41 lines
1.8 KiB
C#
using System.Net;
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using WebPush;
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namespace ROLAC.API.Services.Notifications;
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/// <summary>
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/// Sends one encrypted Web Push message via the WebPush library, signing with the VAPID keys from
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/// the notification settings. Translates a "subscription gone" (404/410) response into
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/// <see cref="WebPushSendResult.IsExpired"/> so the caller prunes the dead subscription.
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/// </summary>
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public sealed class WebPushSender : IWebPushSender
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{
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private readonly INotificationSettingsService _settings;
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private readonly WebPushClient _client = new();
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public WebPushSender(INotificationSettingsService settings) => _settings = settings;
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public async Task<WebPushSendResult> SendAsync(
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WebPushTarget target, string payloadJson, CancellationToken ct = default)
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{
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var options = _settings.GetWebPush();
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if (string.IsNullOrWhiteSpace(options.PublicKey) || string.IsNullOrWhiteSpace(options.PrivateKey))
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return new WebPushSendResult(Success: false, IsExpired: false, Error: "Web Push is not configured (missing VAPID keys).");
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var subject = string.IsNullOrWhiteSpace(options.Subject) ? "mailto:admin@rolac.local" : options.Subject;
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var vapid = new VapidDetails(subject, options.PublicKey, options.PrivateKey);
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var subscription = new PushSubscription(target.Endpoint, target.P256dh, target.Auth);
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try
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{
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await _client.SendNotificationAsync(subscription, payloadJson, vapid, ct);
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return new WebPushSendResult(Success: true, IsExpired: false, Error: null);
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}
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catch (WebPushException ex)
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{
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var expired = ex.StatusCode is HttpStatusCode.NotFound or HttpStatusCode.Gone;
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return new WebPushSendResult(Success: false, IsExpired: expired, Error: ex.Message);
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}
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}
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}
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