import nodemailer from "nodemailer";
import { readFileSync } from "fs";
import dkim from "nodemailer-dkim";
const SMTP_HOST = process.env.SMTP_HOST;
const SMTP_PORT = process.env.SMTP_PORT
? parseInt(process.env.SMTP_PORT)
: undefined;
const SMTP_USER = process.env.SMTP_USER;
const SMTP_PASS = process.env.SMTP_PASS;
const SMTP_FROM = process.env.SMTP_FROM;
const BASE_URL = process.env.BASE_URL || "http://localhost:3000";
// DKIM Configuration (optional)
const DKIM_SELECTOR = process.env.DKIM_SELECTOR;
const DKIM_DOMAIN = process.env.DKIM_DOMAIN;
const DKIM_PRIVATE_KEY_FILE = process.env.DKIM_PRIVATE_KEY_FILE;
class Mailer {
private transporter: any;
private enabled: boolean;
constructor() {
// Check if SMTP is configured
if (!SMTP_HOST || !SMTP_PORT || !SMTP_USER || !SMTP_PASS || !SMTP_FROM) {
console.warn("SMTP not configured - email functionality disabled");
this.enabled = false;
return;
}
this.enabled = true;
// Create SMTP transporter
this.transporter = nodemailer.createTransport({
host: SMTP_HOST,
port: SMTP_PORT,
secure: false, // Use STARTTLS
auth: {
user: SMTP_USER,
pass: SMTP_PASS,
},
});
// Add DKIM signing if configured
if (DKIM_SELECTOR && DKIM_DOMAIN && DKIM_PRIVATE_KEY_FILE) {
try {
const dkimPrivateKey = readFileSync(DKIM_PRIVATE_KEY_FILE, "utf-8");
this.transporter.use(
"stream",
dkim.signer({
domainName: DKIM_DOMAIN,
keySelector: DKIM_SELECTOR,
privateKey: dkimPrivateKey,
headerFieldNames: "from:to:subject:date:message-id",
}),
);
console.log("DKIM signing enabled");
} catch (error) {
console.warn("DKIM private key not found, emails will not be signed");
}
}
}
private async sendMail(
to: string,
subject: string,
html: string,
text: string,
): Promise<void> {
if (!this.enabled) {
throw new Error("Email is not configured");
}
await this.transporter.sendMail({
from: SMTP_FROM,
to,
subject,
text,
html,
headers: {
"X-Mailer": "Canvas MCP",
},
});
}
async sendMagicLink(email: string, token: string): Promise<void> {
const magicLink = `${BASE_URL}/auth/verify?token=${token}`;
const html = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
img { max-width: 100%; height: auto; }
</style>
</head>
<body style="font-family: system-ui, -apple-system, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 40px auto; padding: 20px;">
<div>
<h1 style="margin-bottom: 20px;">Sign in to Canvas MCP</h1>
<p>Click this link to sign in:</p>
<p><a href="${magicLink}" style="color: #0066cc;">${magicLink}</a></p>
<hr style="margin: 30px 0; border: none; border-top: 1px solid #ddd;">
<p style="font-size: 12px; color: #999;">This link expires in 15 minutes. If you didn't request this, ignore it.</p>
</div>
</body>
</html>`;
const text = `Sign in to Canvas MCP
Click this link to sign in:
${magicLink}
This link expires in 15 minutes.
If you didn't request this, you can safely ignore it.`;
await this.sendMail(email, "Sign in to Canvas MCP", html, text);
}
async sendOAuthConfirmation(
email: string,
canvasDomain: string,
): Promise<void> {
const html = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
img { max-width: 100%; height: auto; }
</style>
</head>
<body style="font-family: system-ui, -apple-system, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 40px auto; padding: 20px;">
<div>
<h1 style="margin-bottom: 20px;">Canvas Account Connected</h1>
<div style="background: #d4edda; color: #0a6640; padding: 16px; border-radius: 4px; margin: 20px 0;">
Your Canvas account has been successfully connected!
</div>
<p><strong>Canvas Domain:</strong> <code style="background: #f5f5f5; padding: 2px 6px; border-radius: 3px;">${canvasDomain}</code></p>
<p><a href="${BASE_URL}/dashboard" style="color: #0066cc;">View Dashboard →</a></p>
<hr style="margin: 30px 0; border: none; border-top: 1px solid #ddd;">
<h2 style="font-size: 18px;">Next Steps</h2>
<ol style="padding-left: 20px;">
<li>Configure Claude Desktop with the MCP server URL</li>
<li>Authorize Claude to access your Canvas data</li>
<li>Start asking questions about your courses!</li>
</ol>
</div>
</body>
</html>`;
const text = `Canvas Account Connected!
Your Canvas account (${canvasDomain}) has been successfully connected.
Visit your dashboard: ${BASE_URL}/dashboard
Next Steps:
1. Configure Claude Desktop with the MCP server URL
2. Authorize Claude to access your Canvas data
3. Start asking questions about your courses!`;
await this.sendMail(
email,
"Canvas Account Connected - Canvas MCP",
html,
text,
);
}
}
export default new Mailer();
