From 9ef099c2679047569aa2da0d688a919bf707e6c6 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Wed, 20 Nov 2019 12:41:41 +0100
Subject: Email module

---
 modules/email/.gitignore |  2 ++
 modules/email/email.js   | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 modules/email/.gitignore
 create mode 100644 modules/email/email.js

(limited to 'modules/email')

diff --git a/modules/email/.gitignore b/modules/email/.gitignore
new file mode 100644
index 0000000..df02057
--- /dev/null
+++ b/modules/email/.gitignore
@@ -0,0 +1,2 @@
+allowed_recipients.txt
+password.txt
diff --git a/modules/email/email.js b/modules/email/email.js
new file mode 100644
index 0000000..834a471
--- /dev/null
+++ b/modules/email/email.js
@@ -0,0 +1,68 @@
+var cmn = require("../$common.js"),
+    fs = require("fs"),
+    child_process = require("child_process"),
+    bodyParser = require("body-parser");
+
+var allowedRecipients = [];
+
+var ratelimitAllowed = (function() {
+	var numEvents = 20, period = 24 * 3600 * 1000;
+	var eventList = [];
+
+	return function ratelimitAllowed() {
+		var now = new Date();
+		while (now - eventList[0] > period) eventList.unshift();
+		if (eventList.length >= numEvents) return false;
+		eventList.push(now);
+		return true;
+	};
+})();
+
+function sendEmail(recip, text) {
+	var opts = {
+		stdio: ["pipe", "inherit", "inherit"]
+	};
+	var proc = child_process.spawn("sendmail", [recip], opts);
+
+	// Make sure it doesn't run indefinitely
+	var timeout = setTimeout(() => {proc.kill();}, 5000);
+	proc.on("exit", () => clearTimeout(timeout));
+	proc.on("error", err => {
+		console.log("email: Failed to start sendmail:", err);
+		clearTimeout(timeout);
+	});
+	proc.stdin.on("error", err => {
+		console.log("email: Failed to write to sendmail:", err);
+		clearTimeout(timeout);
+	});
+	proc.stdin.end(
+		"From: email-module@tomsmeding.com\n" +
+		"To: " + recip + "\n" +
+		"Subject: Mail from email module\n\n" +
+		text
+	);
+}
+
+module.exports = function(app, io, moddir) {
+	var allowedRecipients =
+		fs.readFileSync(moddir + "/allowed_recipients.txt").toString().trim().split("\n");
+
+	var password = fs.readFileSync(moddir + "/password.txt").toString().trim();
+
+	app.post("/email", bodyParser.json(), function(req, res) {
+		var body = req.body;
+		console.log(body);
+		if (typeof body != "object" ||
+				typeof body.password != "string" ||
+				typeof body.to != "string" ||
+				typeof body.text != "string" ||
+				body.password != password ||
+				allowedRecipients.indexOf(body.to) == -1) {
+			res.status(400).send("Invalid request");
+			return;
+		}
+		var text = body.text.slice(0, 1000000);  // 1 MB is enough
+		sendEmail(body.to, body.text);
+		res.end();
+	});
+};
-- 
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