Chungus 2.0

server/private/lib/resend.ts

@@ -0,0 +1,124 @@
+/*
+ * This file is part of a proprietary work.
+ *
+ * Copyright (c) 2025 Fossorial, Inc.
+ * All rights reserved.
+ *
+ * This file is licensed under the Fossorial Commercial License.
+ * You may not use this file except in compliance with the License.
+ * Unauthorized use, copying, modification, or distribution is strictly prohibited.
+ *
+ * This file is not licensed under the AGPLv3.
+ */
+
+import { Resend } from "resend";
+import privateConfig from "#private/lib/config";
+import logger from "@server/logger";
+
+export enum AudienceIds {
+    General = "5cfbf99b-c592-40a9-9b8a-577a4681c158",
+    Subscribed = "870b43fd-387f-44de-8fc1-707335f30b20",
+    Churned = "f3ae92bd-2fdb-4d77-8746-2118afd62549"
+}
+
+const resend = new Resend(
+    privateConfig.getRawPrivateConfig().server.resend_api_key || "missing"
+);
+
+export default resend;
+
+export async function moveEmailToAudience(
+    email: string,
+    audienceId: AudienceIds
+) {
+    if (process.env.ENVIRONMENT !== "prod") {
+        logger.debug(`Skipping moving email ${email} to audience ${audienceId} in non-prod environment`);
+        return;
+    }
+    const { error, data } = await retryWithBackoff(async () => {
+        const { data, error } = await resend.contacts.create({
+            email,
+            unsubscribed: false,
+            audienceId
+        });
+        if (error) {
+            throw new Error(
+                `Error adding email ${email} to audience ${audienceId}: ${error}`
+            );
+        }
+        return { error, data };
+    });
+
+    if (error) {
+        logger.error(
+            `Error adding email ${email} to audience ${audienceId}: ${error}`
+        );
+        return;
+    }
+
+    if (data) {
+        logger.debug(
+            `Added email ${email} to audience ${audienceId} with contact ID ${data.id}`
+        );
+    }
+
+    const otherAudiences = Object.values(AudienceIds).filter(
+        (id) => id !== audienceId
+    );
+
+    for (const otherAudienceId of otherAudiences) {
+        const { error, data } = await retryWithBackoff(async () => {
+            const { data, error } = await resend.contacts.remove({
+                email,
+                audienceId: otherAudienceId
+            });
+            if (error) {
+                throw new Error(
+                    `Error removing email ${email} from audience ${otherAudienceId}: ${error}`
+                );
+            }
+            return { error, data };
+        });
+
+        if (error) {
+            logger.error(
+                `Error removing email ${email} from audience ${otherAudienceId}: ${error}`
+            );
+        }
+
+        if (data) {
+            logger.info(
+                `Removed email ${email} from audience ${otherAudienceId}`
+            );
+        }
+    }
+}
+
+type RetryOptions = {
+    retries?: number;
+    initialDelayMs?: number;
+    factor?: number;
+};
+
+export async function retryWithBackoff<T>(
+    fn: () => Promise<T>,
+    options: RetryOptions = {}
+): Promise<T> {
+    const { retries = 5, initialDelayMs = 500, factor = 2 } = options;
+
+    let attempt = 0;
+    let delay = initialDelayMs;
+
+    while (true) {
+        try {
+            return await fn();
+        } catch (err) {
+            attempt++;
+
+            if (attempt > retries) throw err;
+
+            await new Promise((resolve) => setTimeout(resolve, delay));
+            delay *= factor;
+        }
+    }
+}