move environment to src/environment add smtp env vars, move some other items

src/lib/validation/mailer.ts

@@ -0,0 +1,50 @@
+import { isValidEmail } from "./email";
+import { isValidHostname, isValidPort } from "./general";
+
+import type { MailerConfig } from "#types/config";
+
+function validateMailerConfig(config: MailerConfig): {
+	isValid: boolean;
+	errors: string[];
+} {
+	const errors: string[] = [];
+
+	const isValidSMTPAddress = isValidHostname(config.address);
+
+	if (!isValidSMTPAddress) {
+		errors.push(`Invalid SMTP address: ${config.address}`);
+	}
+
+	if (!isValidPort(config.port)) {
+		errors.push(
+			`Invalid SMTP port: ${config.port}. Port must be between 1 and 65535`,
+		);
+	}
+
+	if (!isValidEmail(config.from)) {
+		errors.push(`Invalid from email address: ${config.from}`);
+	}
+
+	if (!isValidEmail(config.username)) {
+		errors.push(`Invalid username email address: ${config.username}`);
+	}
+
+	if (!config.password || config.password.trim().length === 0) {
+		errors.push("SMTP password is required");
+	}
+
+	if (config.port === 465 && !config.secure) {
+		errors.push("Port 465 requires SMTP_SECURE=true");
+	}
+
+	if (config.port === 587 && config.secure) {
+		errors.push("Port 587 typically uses SMTP_SECURE=false with STARTTLS");
+	}
+
+	return {
+		isValid: errors.length === 0,
+		errors,
+	};
+}
+
+export { isValidPort, isValidEmail, validateMailerConfig };