communication-systems

تایید شده

Email, notifications, and messaging system patterns

@majiayu000v1.0.0MIT۱۴۰۴/۱۲/۳

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مهارت‌ها کدهای شخص ثالث از مخازن عمومی GitHub هستند. SkillHub الگوهای مخرب شناخته‌شده را اسکن می‌کند اما نمی‌تواند امنیت را تضمین کند. قبل از نصب، کد منبع را بررسی کنید.

نصب با CLI

نصب سراسری (سطح کاربر):

npx skillhub install majiayu000/claude-skill-registry/communication-systems

نصب در پروژه فعلی:

npx skillhub install majiayu000/claude-skill-registry/communication-systems --project

مسیر پیشنهادی: ~/.claude/skills/communication-systems/

محتوای SKILL.md

---
name: communication-systems
description: Email, notifications, and messaging system patterns
domain: domain-applications
version: 1.0.0
tags: [email, notifications, push, webhooks, messaging]
---

# Communication Systems

## Overview

Building email systems, push notifications, in-app messaging, and webhook integrations.

---

## Email Systems

### Transactional Email

```typescript
import { Resend } from 'resend';

const resend = new Resend(process.env.RESEND_API_KEY);

interface EmailOptions {
  to: string | string[];
  subject: string;
  html?: string;
  text?: string;
  template?: string;
  data?: Record<string, any>;
  attachments?: Array<{
    filename: string;
    content: Buffer | string;
  }>;
}

async function sendEmail(options: EmailOptions) {
  let html = options.html;

  // Use template if specified
  if (options.template) {
    html = await renderTemplate(options.template, options.data);
  }

  const { data, error } = await resend.emails.send({
    from: '[email protected]',
    to: options.to,
    subject: options.subject,
    html,
    text: options.text,
    attachments: options.attachments,
  });

  if (error) {
    console.error('Email send failed:', error);
    throw error;
  }

  // Log for tracking
  await prisma.emailLog.create({
    data: {
      messageId: data.id,
      to: Array.isArray(options.to) ? options.to.join(',') : options.to,
      subject: options.subject,
      template: options.template,
      status: 'sent',
    },
  });

  return data;
}

// Email templates with React Email
import { render } from '@react-email/render';
import { WelcomeEmail } from './templates/WelcomeEmail';
import { PasswordResetEmail } from './templates/PasswordResetEmail';

const templates = {
  welcome: WelcomeEmail,
  passwordReset: PasswordResetEmail,
};

async function renderTemplate(name: string, data: Record<string, any>) {
  const Template = templates[name];
  if (!Template) throw new Error(`Template ${name} not found`);

  return render(<Template {...data} />);
}

// React Email template
import {
  Html, Head, Body, Container, Text, Button, Img,
} from '@react-email/components';

function WelcomeEmail({ name, actionUrl }: { name: string; actionUrl: string }) {
  return (
    <Html>
      <Head />
      <Body style={{ fontFamily: 'Arial, sans-serif' }}>
        <Container>
          <Img src="https://example.com/logo.png" width="120" height="40" alt="Logo" />
          <Text>Hi {name},</Text>
          <Text>Welcome to our platform! Get started by setting up your account.</Text>
          <Button
            href={actionUrl}
            style={{ background: '#007bff', color: '#fff', padding: '12px 24px' }}
          >
            Get Started
          </Button>
        </Container>
      </Body>
    </Html>
  );
}
```

### Email Queue

```typescript
import Bull from 'bull';

const emailQueue = new Bull('email', process.env.REDIS_URL);

// Add to queue
async function queueEmail(options: EmailOptions, delay?: number) {
  return emailQueue.add('send', options, {
    delay,
    attempts: 3,
    backoff: { type: 'exponential', delay: 60000 },
  });
}

// Process queue
emailQueue.process('send', async (job) => {
  await sendEmail(job.data);
});

// Handle failures
emailQueue.on('failed', async (job, error) => {
  console.error(`Email job ${job.id} failed:`, error);

  await prisma.emailLog.update({
    where: { jobId: job.id },
    data: { status: 'failed', error: error.message },
  });
});

// Bulk email with rate limiting
async function sendBulkEmail(recipients: string[], template: string, data: Record<string, any>) {
  const jobs = recipients.map((to, index) => ({
    name: 'send',
    data: { to, template, data },
    opts: { delay: index * 100 }, // Stagger sends
  }));

  await emailQueue.addBulk(jobs);
}
```

---

## Push Notifications

### Web Push

```typescript
import webpush from 'web-push';

webpush.setVapidDetails(
  'mailto:[email protected]',
  process.env.VAPID_PUBLIC_KEY!,
  process.env.VAPID_PRIVATE_KEY!
);

interface PushSubscription {
  endpoint: string;
  keys: {
    p256dh: string;
    auth: string;
  };
}

// Store subscription
async function saveSubscription(userId: string, subscription: PushSubscription) {
  await prisma.pushSubscription.upsert({
    where: { endpoint: subscription.endpoint },
    update: { keys: subscription.keys },
    create: {
      userId,
      endpoint: subscription.endpoint,
      keys: subscription.keys,
    },
  });
}

// Send push notification
async function sendPush(userId: string, payload: {
  title: string;
  body: string;
  icon?: string;
  url?: string;
  data?: Record<string, any>;
}) {
  const subscriptions = await prisma.pushSubscription.findMany({
    where: { userId },
  });

  const results = await Promise.allSettled(
    subscriptions.map(async (sub) => {
      try {
        await webpush.sendNotification(
          { endpoint: sub.endpoint, keys: sub.keys },
          JSON.stringify(payload)
        );
      } catch (error) {
        if (error.statusCode === 410) {
          // Subscription expired, remove it
          await prisma.pushSubscription.delete({ where: { id: sub.id } });
        }
        throw error;
      }
    })
  );

  return results;
}

// Service worker handler
// public/sw.js
self.addEventListener('push', (event) => {
  const data = event.data.json();

  event.waitUntil(
    self.registration.showNotification(data.title, {
      body: data.body,
      icon: data.icon || '/icon-192.png',
      data: data,
    })
  );
});

self.addEventListener('notificationclick', (event) => {
  event.notification.close();

  if (event.notification.data.url) {
    event.waitUntil(clients.openWindow(event.notification.data.url));
  }
});
```

### Mobile Push (FCM)

```typescript
import admin from 'firebase-admin';

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
});

interface MobileNotification {
  title: string;
  body: string;
  imageUrl?: string;
  data?: Record<string, string>;
}

async function sendMobilePush(
  tokens: string[],
  notification: MobileNotification
) {
  const message: admin.messaging.MulticastMessage = {
    tokens,
    notification: {
      title: notification.title,
      body: notification.body,
      imageUrl: notification.imageUrl,
    },
    data: notification.data,
    android: {
      priority: 'high',
      notification: {
        sound: 'default',
        clickAction: 'OPEN_ACTIVITY',
      },
    },
    apns: {
      payload: {
        aps: {
          sound: 'default',
          badge: 1,
        },
      },
    },
  };

  const response = await admin.messaging().sendEachForMulticast(message);

  // Handle failures
  response.responses.forEach((resp, idx) => {
    if (!resp.success) {
      const errorCode = resp.error?.code;
      if (
        errorCode === 'messaging/invalid-registration-token' ||
        errorCode === 'messaging/registration-token-not-registered'
      ) {
        // Remove invalid token
        removeDeviceToken(tokens[idx]);
      }
    }
  });

  return response;
}
```

---

## In-App Notifications

```typescript
interface Notification {
  id: string;
  userId: string;
  type: string;
  title: string;
  message: string;
  data?: Record<string, any>;
  read: boolean;
  createdAt: Date;
}

// Create notification
async function createNotification(params: {
  userId: string;
  type: string;
  title: string;
  message: string;
  data?: Record<string, any>;
}) {
  const notification = await prisma.notification.create({
    data: {
      ...params,
      read: false,
    },
  });

  // Send real-time update
  await pubsub.publish(`notifications:${params.userId}`, {
    type: 'NEW_NOTIFICATION',
    notification,
  });

  return notification;
}

// Get notifications with pagination
async function getNotifications(userId: string, options: {
  page?: number;
  limit?: number;
  unreadOnly?: boolean;
}) {
  const { page = 1, limit = 20, unreadOnly = false } = options;

  const where = {
    userId,
    ...(unreadOnly && { read: false }),
  };

  const [notifications, total, unreadCount] = await Promise.all([
    prisma.notification.findMany({
      where,
      orderBy: { createdAt: 'desc' },
      skip: (page - 1) * limit,
      take: limit,
    }),
    prisma.notification.count({ where }),
    prisma.notification.count({ where: { userId, read: false } }),
  ]);

  return { notifications, total, unreadCount };
}

// Mark as read
async function markAsRead(userId: string, notificationIds: string[]) {
  await prisma.notification.updateMany({
    where: {
      id: { in: notificationIds },
      userId,
    },
    data: { read: true },
  });
}

// React hook for notifications
function useNotifications() {
  const [notifications, setNotifications] = useState<Notification[]>([]);
  const [unreadCount, setUnreadCount] = useState(0);

  useEffect(() => {
    // Initial fetch
    fetchNotifications().then(({ notifications, unreadCount }) => {
      setNotifications(notifications);
      setUnreadCount(unreadCount);
    });

    // Subscribe to real-time updates
    const unsubscribe = subscribeToNotifications((notification) => {
      setNotifications((prev) => [notification, ...prev]);
      setUnreadCount((prev) => prev + 1);
    });

    return unsubscribe;
  }, []);

  return { notifications, unreadCount, markAsRead };
}
```

---

## Webhooks

```typescript
interface Webhook {
  id: string;
  url: string;
  secret: string;
  events: string[];
  active: boolean;
}

// Register webhook
async function registerWebhook(params: {
  url: string;
  events: string[];
}) {
  const secret = crypto.randomBytes(32).toString('hex');

  return prisma.webhook.create({
    data: {
      url: params.url,
      events: params.events,
      secret,
      active: true,
    },
  });
}

// Send webhook
async function sendWebhook(webhookId: string, event: string, payload: any) {
  const webhook = await prisma.webhook.findUnique({ where: { id: webhookId } });
  if (!webhook || !webhook.active) return;

  const timestamp = Date.now().toString();
  const body = JSON.stringify({ event, data: payload, timestamp });

  // Create signature
  const signature = crypto
    .createHmac('sha256', webhook.secret)
    .update(body)
    .digest('hex');

  try {
    const response = await fetch(webhook.url, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-Webhook-Signature': signature,
        'X-Webhook-Timestamp': timestamp,
      },
      body,
    });

    await prisma.webhookLog.create({
      data: {
        webhookId,
        event,
        payload,
        responseStatus: response.status,
        success: response.ok,
      },
    });

    // Disable after multiple failures
    if (!response.ok) {
      await handleWebhookFailure(webhookId);
    }
  } catch (error) {
    await prisma.webhookLog.create({
      data: {
        webhookId,
        event,
        payload,
        error: error.message,
        success: false,
      },
    });

    await handleWebhookFailure(webhookId);
  }
}

// Verify webhook signature (receiver side)
function verifyWebhookSignature(
  body: string,
  signature: string,
  secret: string
): boolean {
  const expected = crypto
    .createHmac('sha256', secret)
    .update(body)
    .digest('hex');

  return crypto.timingSafeEqual(
    Buffer.from(signature),
    Buffer.from(expected)
  );
}
```

---

## Related Skills

- [[realtime-systems]] - Real-time messaging
- [[backend]] - API development
- [[reliability-engineering]] - Delivery guarantees

نصب مهارت

مهارت‌ها کدهای شخص ثالث از مخازن عمومی GitHub هستند. SkillHub الگوهای مخرب شناخته‌شده را اسکن می‌کند اما نمی‌تواند امنیت را تضمین کند. قبل از نصب، کد منبع را بررسی کنید.

نصب با CLI

نصب سراسری (سطح کاربر):

npx skillhub install majiayu000/claude-skill-registry/communication-systems

نصب در پروژه فعلی:

npx skillhub install majiayu000/claude-skill-registry/communication-systems --project

مسیر پیشنهادی: ~/.claude/skills/communication-systems/