Add plaintext version of email (#66)

samshadwell · web-flow · commit f3a818eac33f · 2026-01-24T16:08:21.000-05:00
diff --git a/src/digest_mailer.rs b/src/digest_mailer.rs
@@ -23,7 +23,8 @@ impl DigestMailer {
     pub async fn send_mail(
         &self,
         subject: &str,
-        content: &str,
+        html_content: &str,
+        text_content: &str,
         recipient: &str,
         unsubscribe_url: &str,
     ) -> Result<()> {
@@ -40,9 +41,16 @@ impl DigestMailer {
 
         // Build email content
         let subject_content = Content::builder().data(subject).charset("UTF-8").build()?;
-        let body_content = Content::builder().data(content).charset("UTF-8").build()?;
+        let html_body = Content::builder()
+            .data(html_content)
+            .charset("UTF-8")
+            .build()?;
+        let text_body = Content::builder()
+            .data(text_content)
+            .charset("UTF-8")
+            .build()?;
 
-        let body = Body::builder().html(body_content).build();
+        let body = Body::builder().html(html_body).text(text_body).build();
         let message = Message::builder()
             .subject(subject_content)
             .body(body)
diff --git a/src/main.rs b/src/main.rs
@@ -1,3 +1,4 @@
+use anyhow::Context;
 use askama::Template;
 use aws_config::BehaviorVersion;
 use chrono::{DateTime, NaiveTime, Utc};
@@ -13,13 +14,20 @@ use serde_json::Value;
 use std::collections::HashMap;
 use std::env;
 use std::sync::Arc;
-use tracing::{error, info, warn};
+use tracing::{error, info};
 
 const MAX_CONCURRENT_EMAILS: usize = 10;
 
 #[derive(Template)]
 #[template(path = "digest.html")]
-struct DigestTemplate<'a> {
+struct DigestHtmlTemplate<'a> {
+    posts: &'a [Post],
+    unsubscribe_url: &'a str,
+}
+
+#[derive(Template)]
+#[template(path = "digest.txt")]
+struct DigestTextTemplate<'a> {
     posts: &'a [Post],
     unsubscribe_url: &'a str,
 }
@@ -150,24 +158,28 @@ async fn handler(_event: LambdaEvent<Value>) -> Result<(), Error> {
                     base_url, subscriber.unsubscribe_token
                 );
 
-                let tmpl = DigestTemplate {
+                let html_content = DigestHtmlTemplate {
                     posts,
                     unsubscribe_url: &unsubscribe_url,
-                };
-                let content = match tmpl.render() {
-                    Ok(c) => c,
-                    Err(e) => {
-                        warn!(
-                            email = subscriber.email,
-                            error = %e,
-                            "Failed to render template"
-                        );
-                        return Err(anyhow::anyhow!("Template render failed: {}", e));
-                    }
-                };
+                }
+                .render()
+                .context("Failed to render HTML template")?;
+
+                let text_content = DigestTextTemplate {
+                    posts,
+                    unsubscribe_url: &unsubscribe_url,
+                }
+                .render()
+                .context("Failed to render text template")?;
 
                 mailer
-                    .send_mail(subject, &content, &subscriber.email, &unsubscribe_url)
+                    .send_mail(
+                        subject,
+                        &html_content,
+                        &text_content,
+                        &subscriber.email,
+                        &unsubscribe_url,
+                    )
                     .await
             }
         })
diff --git a/templates/digest.html b/templates/digest.html
@@ -1,3 +1,9 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+</head>
+<body>
 Your daily Hacker News digest:
 <br />
 {% for post in posts %}
@@ -15,3 +21,5 @@
 <p style="font-size: 12px; color: #666;">
     <a href="{{ unsubscribe_url }}" style="color: #666;">Unsubscribe</a> from this digest.
 </p>
+</body>
+</html>
diff --git a/templates/digest.txt b/templates/digest.txt
@@ -0,0 +1,11 @@
+Your daily Hacker News digest:
+
+{% for post in posts %}
+{{ post.title }}
+{{ post.points }} points
+{% if let Some(url) = post.url %}Link: {{ url }}
+{% endif %}Comments: https://news.ycombinator.com/item?id={{ post.object_id }}
+
+{% endfor %}
+---
+Unsubscribe: {{ unsubscribe_url }}
