refactor: decompose backend services and routes for maintainability

backend/src/services/notifications/delivery.ts

@@ -0,0 +1,123 @@
+import nodemailer from "nodemailer";
+import { sendShoutrrrNotification } from "../../routes/settings.js";
+
+type MailDeliveryInfo = {
+	accepted?: unknown;
+	rejected?: unknown;
+	response?: unknown;
+};
+
+function normalizeRecipients(value: unknown): string[] {
+	if (!Array.isArray(value)) return [];
+	return value
+		.map((entry) => (typeof entry === "string" ? entry : String(entry ?? "")))
+		.map((entry) => entry.trim())
+		.filter(Boolean);
+}
+
+function getDeliveryError(info: MailDeliveryInfo): string | null {
+	const accepted = normalizeRecipients(info.accepted);
+	const rejected = normalizeRecipients(info.rejected);
+
+	if (accepted.length > 0) return null;
+	if (rejected.length > 0) {
+		return `SMTP rejected all recipients: ${rejected.join(", ")}`;
+	}
+
+	if (typeof info.response === "string" && info.response.trim()) {
+		return `SMTP did not confirm accepted recipients. Response: ${info.response}`;
+	}
+
+	return "SMTP did not confirm accepted recipients.";
+}
+
+export type EmailDeliveryRequest = {
+	to: string;
+	subject: string;
+	text: string;
+	html: string;
+	from?: string;
+};
+
+export type EmailDeliveryResult = {
+	success: boolean;
+	error?: string;
+	messageId?: string;
+	smtpResponse?: string;
+};
+
+export function getSmtpConfig(): {
+	host?: string;
+	user?: string;
+	pass?: string;
+	port: number;
+	secure: boolean;
+	from?: string;
+} {
+	const host = process.env.SMTP_HOST;
+	const user = process.env.SMTP_USER;
+	const pass = process.env.SMTP_TOKEN || process.env.SMTP_PASS;
+	const port = parseInt(process.env.SMTP_PORT ?? "587", 10);
+	const secure = process.env.SMTP_SECURE === "true";
+	const from = process.env.SMTP_FROM ?? user;
+
+	return { host, user, pass, port, secure, from };
+}
+
+export async function sendEmailNotification(input: EmailDeliveryRequest): Promise<EmailDeliveryResult> {
+	const smtp = getSmtpConfig();
+	if (!smtp.host || !smtp.user) {
+		return { success: false, error: "SMTP not configured" };
+	}
+
+	try {
+		const transporter = nodemailer.createTransport({
+			host: smtp.host,
+			port: smtp.port,
+			secure: smtp.secure,
+			auth: {
+				user: smtp.user,
+				pass: smtp.pass ?? "",
+			},
+		});
+
+		const mailResult = await transporter.sendMail({
+			from: input.from ?? smtp.from,
+			to: input.to,
+			subject: input.subject,
+			text: input.text,
+			html: input.html,
+		});
+
+		const deliveryError = getDeliveryError(mailResult);
+		if (deliveryError) {
+			return { success: false, error: deliveryError };
+		}
+
+		return {
+			success: true,
+			messageId: mailResult.messageId,
+			smtpResponse: typeof mailResult.response === "string" ? mailResult.response : undefined,
+		};
+	} catch (error) {
+		const errorMessage = error instanceof Error ? error.message : "Unknown error";
+		return { success: false, error: errorMessage };
+	}
+}
+
+export async function sendPushNotification(
+	url: string,
+	title: string,
+	message: string
+): Promise<{ success: boolean; error?: string }> {
+	try {
+		const result = await sendShoutrrrNotification(url, title, message);
+		if (!result.success) {
+			return { success: false, error: result.error };
+		}
+		return { success: true };
+	} catch (error) {
+		const errorMessage = error instanceof Error ? error.message : "Unknown error";
+		return { success: false, error: errorMessage };
+	}
+}