feat: add project and email service

api/src/email.rs

@@ -0,0 +1,61 @@
+use lettre::message::Mailbox;
+use lettre::transport::smtp::client::Tls;
+use lettre::{Message, SmtpTransport, Transport};
+
+pub fn send_notification(
+    id: i64,
+    question: &str,
+    notify_email: &str,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let truncated = if question.len() > 50 {
+        format!("{}...", &question[..50])
+    } else {
+        question.to_string()
+    };
+
+    let from: Mailbox = "Q&A <qa@extremist.software>".parse()?;
+    let reply_to: Mailbox = format!("qa+{id}@extremist.software").parse()?;
+    let to: Mailbox = notify_email.parse()?;
+
+    let email = Message::builder()
+        .from(from)
+        .reply_to(reply_to)
+        .to(to)
+        .subject(format!("Q&A #{id}: {truncated}"))
+        .body(question.to_string())?;
+
+    let mailer = SmtpTransport::builder_dangerous("localhost")
+        .tls(Tls::None)
+        .build();
+    mailer.send(&email)?;
+
+    Ok(())
+}
+
+pub fn strip_quoted_text(body: &str) -> String {
+    let mut result = Vec::new();
+    for line in body.lines() {
+        if line.starts_with('>') {
+            continue;
+        }
+        if line.starts_with("On ") && line.ends_with("wrote:") {
+            break;
+        }
+        result.push(line);
+    }
+    result.join("\n").trim().to_string()
+}
+
+pub fn extract_id_from_address(to: &str) -> Result<i64, Box<dyn std::error::Error>> {
+    let addr = to.trim();
+    let addr = if let Some(start) = addr.find('<') {
+        &addr[start + 1..addr.find('>').unwrap_or(addr.len())]
+    } else {
+        addr
+    };
+    let local = addr.split('@').next().unwrap_or("");
+    let id_str = local
+        .strip_prefix("qa+")
+        .ok_or("No qa+ prefix in address")?;
+    Ok(id_str.parse()?)
+}