Draft: E-Mail templates
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@ -128,6 +128,7 @@
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logMessages.Add("No Email provider configured.");
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}
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builder.Services.AddSingleton<EmailTemplateService>();
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builder.Services.AddHostedService<EmailBackgroundWorker>();
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#endregion
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@ -9,12 +9,13 @@
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namespace Wave.Services;
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public class EmailBackgroundWorker(ILogger<EmailBackgroundWorker> logger, IDbContextFactory<ApplicationDbContext> contextFactory, IOptions<SmtpConfiguration> config, IOptions<Customization> customizations, IOptions<Features> features) : IHostedService, IDisposable {
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public class EmailBackgroundWorker(ILogger<EmailBackgroundWorker> logger, IDbContextFactory<ApplicationDbContext> contextFactory, IOptions<SmtpConfiguration> config, IOptions<Customization> customizations, IOptions<Features> features, EmailTemplateService templateService) : IHostedService, IDisposable {
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private ILogger<EmailBackgroundWorker> Logger { get; } = logger;
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private IDbContextFactory<ApplicationDbContext> ContextFactory { get; } = contextFactory;
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private SmtpConfiguration Configuration { get; } = config.Value;
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private Customization Customizations { get; } = customizations.Value;
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private Features Features { get; } = features.Value;
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private EmailTemplateService TemplateService { get; } = templateService;
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private Timer? Timer { get; set; }
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@ -84,22 +85,19 @@ public class EmailBackgroundWorker(ILogger<EmailBackgroundWorker> logger, IDbCon
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string articleLink = ArticleUtilities.GenerateArticleLink(
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newsletter.Article, new Uri(Customizations.AppUrl, UriKind.Absolute));
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string unsubscribeLink = new Uri(new Uri(Customizations.AppUrl, UriKind.Absolute), "/unsubscribe").AbsoluteUri;
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string template = $"""
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<mjml><mj-body><mj-section><mj-column>
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<mj-text align="center"><a href="{articleLink}">Read in Browser</a></mj-text>
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<mj-image width="200px" src="https://blog.winter-software.com/img/logo.png"></mj-image>
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<mj-divider border-width="1px"></mj-divider>
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<mj-text>{newsletter.Article.BodyHtml}</mj-text>
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<mj-divider border-width="1px"></mj-divider>
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<mj-text align="center"><a href="{unsubscribeLink}">Unsubscribe</a></mj-text>
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</mj-column></mj-section></mj-body></mjml>
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""";
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string template = TemplateService.Process("newsletter", new Dictionary<EmailTemplateService.Constants, object?>{
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{EmailTemplateService.Constants.BrowserLink, articleLink},
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{EmailTemplateService.Constants.ContentLogo, "https://blog.winter-software.com/img/logo.png"},
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{EmailTemplateService.Constants.ContentTitle, newsletter.Article.Title},
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{EmailTemplateService.Constants.ContentBody, newsletter.Article.BodyHtml},
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{EmailTemplateService.Constants.EmailUnsubscribeLink, unsubscribeLink}
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});
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var message = new MimeMessage {
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From = { sender },
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To = { },
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Subject = newsletter.Article.Title
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};
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var builder = new BodyBuilder() {
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var builder = new BodyBuilder {
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HtmlBody = mjmlRenderer.Render(template, options).Html
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};
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message.Body = builder.ToMessageBody();
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96
Wave/Services/EmailTemplateService.cs
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96
Wave/Services/EmailTemplateService.cs
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@ -0,0 +1,96 @@
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using System.Text.RegularExpressions;
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using Mjml.Net;
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namespace Wave.Services;
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public partial class EmailTemplateService(ILogger<EmailTemplateService> logger) {
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public enum Constants {
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BrowserLink, HomeLink, ContentLogo, ContentTitle, ContentBody, EmailUnsubscribeLink
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}
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private ILogger<EmailTemplateService> Logger { get; } = logger;
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private IMjmlRenderer Renderer { get; } = new MjmlRenderer();
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private Regex TokenMatcher { get; } = MyRegex();
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public string Default(string url, string logoLink, string title, string body) {
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return Process("default", new Dictionary<Constants, object?> {
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{Constants.HomeLink, url},
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{Constants.ContentLogo, logoLink},
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{Constants.ContentTitle, title},
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{Constants.ContentBody, body}
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});
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}
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public string Process(string templateName, Dictionary<Constants, object?> data) {
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var options = new MjmlOptions {
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Beautify = false
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};
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string template = $"""
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<mjml>
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<mj-head>
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<mj-preview/>
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</mj-head>
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<mj-body>
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<mj-section>
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<mj-column>
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<mj-text align="center" font-size="13px" font-family="Ubuntu,Verdana">
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<a href="[[{Constants.BrowserLink}]]">Read in Browser</a></mj-text>
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</mj-column>
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</mj-section>
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<mj-section direction="rtl" padding-bottom="15px" padding-left="0px" padding-right="0px" padding-top="15px" padding="15px 0px 15px 0px">
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<mj-column vertical-align="middle" width="33%">
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<mj-image align="center" alt="" border-radius="0" border="none" container-background-color="transparent" height="auto" padding-bottom="5px" padding-left="5px" padding-right="5px" padding-top="5px" padding="5px 5px 5px 5px" href="[[{Constants.HomeLink}]]" src="[[{Constants.ContentLogo}]]"></mj-image>
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</mj-column>
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<mj-column vertical-align="middle" width="67%">
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<mj-text font-size="13px" font-family="Ubuntu,Verdana">
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<h1>[[{Constants.ContentTitle}]]</h1>
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</mj-text>
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</mj-column>
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</mj-section>
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<mj-section>
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<mj-column>
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<mj-divider border-width="1px"></mj-divider>
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</mj-column>
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</mj-section>
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<mj-section>
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<mj-column>
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<mj-text color="#55575d" font-size="13px" font-family="Ubuntu,Verdana">[[{Constants.ContentBody}]]</mj-text>
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</mj-column>
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</mj-section>
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<mj-section>
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<mj-column>
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<mj-divider border-width="1px"></mj-divider>
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</mj-column>
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</mj-section>
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<mj-section>
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<mj-column>
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<mj-text align="center" font-size="13px" font-family="Ubuntu,Verdana">
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<a href="[[{Constants.EmailUnsubscribeLink}]]">Unsubscribe</a>
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</mj-text>
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</mj-column>
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</mj-section>
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</mj-body>
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</mjml>
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""";
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template = TokenMatcher.Replace(template, t =>
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data.TryGetValue(Enum.Parse<Constants>(t.Value[2..^2], true), out object? v) ?
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v?.ToString() ?? "" :
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"");
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(string html, var errors) = Renderer.Render(template, options);
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foreach (var error in errors) {
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Logger.LogWarning("Validation error in template {template}: [{position}] [{type}] {error}",
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templateName, error.Position, error.Type, error.Error);
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}
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return html;
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}
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[GeneratedRegex(@"(\[\[.*?\]\])",
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RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.CultureInvariant)]
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private static partial Regex MyRegex();
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}
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