62c1ded598
Implement multi-channel notification system with: - Core notification service with email, push, and in-app channels - Email templates for all notification types (welcome, plant registered, transport alerts, farm alerts, harvest ready, demand matches, weekly digest) - Push notification support with VAPID authentication - In-app notification management with read/unread tracking - Notification scheduler for recurring and scheduled notifications - API endpoints for notifications CRUD, preferences, and subscriptions - UI components (NotificationBell, NotificationList, NotificationItem, PreferencesForm) - Full notifications page with preferences management - Service worker for push notification handling
358 lines
13 KiB
TypeScript
358 lines
13 KiB
TypeScript
/**
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* Email Notification Channel
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* Handles sending email notifications via SMTP or SendGrid
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*/
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import { EmailNotificationData, NotificationPayload, NotificationType } from '../types';
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interface EmailConfig {
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provider: 'sendgrid' | 'nodemailer' | 'smtp';
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apiKey?: string;
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from: string;
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replyTo?: string;
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smtp?: {
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host: string;
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port: number;
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secure: boolean;
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user: string;
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pass: string;
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};
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}
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export class EmailChannel {
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private config: EmailConfig;
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constructor(config: EmailConfig) {
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this.config = config;
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}
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/**
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* Send an email notification
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*/
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async send(data: EmailNotificationData): Promise<void> {
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const emailData = {
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...data,
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from: data.from || this.config.from,
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replyTo: data.replyTo || this.config.replyTo
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};
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switch (this.config.provider) {
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case 'sendgrid':
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await this.sendViaSendGrid(emailData);
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break;
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case 'smtp':
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case 'nodemailer':
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await this.sendViaSMTP(emailData);
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break;
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default:
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// Development mode - log email
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console.log('[EmailChannel] Development mode - Email would be sent:', {
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to: emailData.to,
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subject: emailData.subject,
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preview: emailData.text?.substring(0, 100)
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});
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}
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}
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/**
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* Send via SendGrid API
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*/
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private async sendViaSendGrid(data: EmailNotificationData): Promise<void> {
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if (!this.config.apiKey) {
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throw new Error('SendGrid API key not configured');
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}
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const response = await fetch('https://api.sendgrid.com/v3/mail/send', {
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method: 'POST',
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headers: {
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'Authorization': `Bearer ${this.config.apiKey}`,
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'Content-Type': 'application/json'
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},
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body: JSON.stringify({
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personalizations: [{ to: [{ email: data.to }] }],
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from: { email: data.from },
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reply_to: data.replyTo ? { email: data.replyTo } : undefined,
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subject: data.subject,
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content: [
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{ type: 'text/plain', value: data.text || data.html.replace(/<[^>]*>/g, '') },
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{ type: 'text/html', value: data.html }
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]
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})
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});
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if (!response.ok) {
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const error = await response.text();
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throw new Error(`SendGrid error: ${error}`);
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}
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}
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/**
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* Send via SMTP (using nodemailer-like approach)
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*/
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private async sendViaSMTP(data: EmailNotificationData): Promise<void> {
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// In production, this would use nodemailer
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// For now, we'll simulate the SMTP send
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if (!this.config.smtp?.host) {
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console.log('[EmailChannel] SMTP not configured - simulating send');
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return;
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}
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// Simulate SMTP connection and send
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console.log(`[EmailChannel] Sending email via SMTP to ${data.to}`);
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// In production implementation:
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// const nodemailer = require('nodemailer');
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// const transporter = nodemailer.createTransport({
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// host: this.config.smtp.host,
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// port: this.config.smtp.port,
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// secure: this.config.smtp.secure,
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// auth: {
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// user: this.config.smtp.user,
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// pass: this.config.smtp.pass
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// }
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// });
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// await transporter.sendMail(data);
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}
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/**
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* Render email template based on notification type
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*/
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async renderTemplate(payload: NotificationPayload): Promise<string> {
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const templates = {
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welcome: this.getWelcomeTemplate,
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plant_registered: this.getPlantRegisteredTemplate,
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plant_reminder: this.getPlantReminderTemplate,
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transport_alert: this.getTransportAlertTemplate,
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farm_alert: this.getFarmAlertTemplate,
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harvest_ready: this.getHarvestReadyTemplate,
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demand_match: this.getDemandMatchTemplate,
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weekly_digest: this.getWeeklyDigestTemplate,
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system_alert: this.getSystemAlertTemplate
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};
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const templateFn = templates[payload.type] || this.getDefaultTemplate;
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return templateFn.call(this, payload);
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}
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/**
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* Base email layout
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*/
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private getBaseLayout(content: string, payload: NotificationPayload): string {
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return `
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>${payload.title}</title>
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<style>
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body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f5f5f5; }
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.container { max-width: 600px; margin: 0 auto; padding: 20px; }
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.header { background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%); color: white; padding: 30px; text-align: center; border-radius: 8px 8px 0 0; }
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.header h1 { margin: 0; font-size: 24px; }
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.logo { font-size: 32px; margin-bottom: 10px; }
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.content { background: white; padding: 30px; border-radius: 0 0 8px 8px; }
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.button { display: inline-block; background: #22c55e; color: white; padding: 12px 24px; text-decoration: none; border-radius: 6px; margin: 20px 0; }
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.button:hover { background: #16a34a; }
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.footer { text-align: center; padding: 20px; color: #666; font-size: 12px; }
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.alert-info { background: #dbeafe; border-left: 4px solid #3b82f6; padding: 15px; margin: 15px 0; }
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.alert-warning { background: #fef3c7; border-left: 4px solid #f59e0b; padding: 15px; margin: 15px 0; }
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.alert-success { background: #d1fae5; border-left: 4px solid #22c55e; padding: 15px; margin: 15px 0; }
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.stats { display: flex; justify-content: space-around; margin: 20px 0; }
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.stat-item { text-align: center; padding: 15px; }
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.stat-value { font-size: 24px; font-weight: bold; color: #22c55e; }
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.stat-label { font-size: 12px; color: #666; }
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</style>
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</head>
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<body>
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<div class="container">
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<div class="header">
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<div class="logo">🌱</div>
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<h1>LocalGreenChain</h1>
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</div>
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<div class="content">
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${content}
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</div>
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<div class="footer">
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<p>LocalGreenChain - Transparent Seed-to-Seed Tracking</p>
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<p>
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<a href="{{unsubscribe_url}}">Manage notification preferences</a>
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</p>
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</div>
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</div>
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</body>
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</html>`;
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}
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private getWelcomeTemplate(payload: NotificationPayload): string {
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const content = `
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<h2>Welcome to LocalGreenChain! 🌿</h2>
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<p>Thank you for joining our community of sustainable growers and conscious consumers.</p>
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<p>With LocalGreenChain, you can:</p>
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<ul>
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<li>Track your plants from seed to seed</li>
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<li>Monitor transport and carbon footprint</li>
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<li>Connect with local growers and consumers</li>
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<li>Manage vertical farms with precision</li>
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</ul>
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">Get Started</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getPlantRegisteredTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Plant Registered Successfully 🌱</h2>
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<p>Your plant has been registered on the blockchain.</p>
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<div class="alert-success">
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<strong>Plant ID:</strong> ${data.plantId || 'N/A'}<br>
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<strong>Species:</strong> ${data.species || 'N/A'}<br>
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<strong>Variety:</strong> ${data.variety || 'N/A'}
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</div>
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<p>You can now track this plant throughout its entire lifecycle.</p>
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Plant Details</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getPlantReminderTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Plant Care Reminder 🌿</h2>
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<div class="alert-info">
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<strong>${payload.title}</strong><br>
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${payload.message}
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</div>
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${data.plantName ? `<p><strong>Plant:</strong> ${data.plantName}</p>` : ''}
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${data.action ? `<p><strong>Recommended Action:</strong> ${data.action}</p>` : ''}
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Plant</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getTransportAlertTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Transport Update 🚚</h2>
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<div class="alert-info">
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${payload.message}
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</div>
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${data.distance ? `
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<div class="stats">
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<div class="stat-item">
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<div class="stat-value">${data.distance} km</div>
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<div class="stat-label">Distance</div>
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</div>
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<div class="stat-item">
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<div class="stat-value">${data.carbonKg || '0'} kg</div>
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<div class="stat-label">Carbon Footprint</div>
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</div>
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</div>
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` : ''}
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Journey</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getFarmAlertTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const alertClass = data.severity === 'warning' ? 'alert-warning' : 'alert-info';
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const content = `
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<h2>Farm Alert ${data.severity === 'warning' ? '⚠️' : 'ℹ️'}</h2>
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<div class="${alertClass}">
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<strong>${payload.title}</strong><br>
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${payload.message}
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</div>
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${data.zone ? `<p><strong>Zone:</strong> ${data.zone}</p>` : ''}
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${data.recommendation ? `<p><strong>Recommendation:</strong> ${data.recommendation}</p>` : ''}
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Farm Dashboard</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getHarvestReadyTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Harvest Ready! 🎉</h2>
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<div class="alert-success">
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<strong>Great news!</strong> Your crop is ready for harvest.
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</div>
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${data.batchId ? `<p><strong>Batch:</strong> ${data.batchId}</p>` : ''}
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${data.cropType ? `<p><strong>Crop:</strong> ${data.cropType}</p>` : ''}
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${data.estimatedYield ? `<p><strong>Estimated Yield:</strong> ${data.estimatedYield}</p>` : ''}
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<p>Log the harvest to update your blockchain records.</p>
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">Log Harvest</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getDemandMatchTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Demand Match Found! 🤝</h2>
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<p>We've found a match between supply and demand.</p>
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<div class="alert-success">
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${payload.message}
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</div>
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${data.matchDetails ? `
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<p><strong>Crop:</strong> ${data.matchDetails.crop}</p>
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<p><strong>Quantity:</strong> ${data.matchDetails.quantity}</p>
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<p><strong>Region:</strong> ${data.matchDetails.region}</p>
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` : ''}
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Match Details</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getWeeklyDigestTemplate(payload: NotificationPayload): string {
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const data = payload.data || {};
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const content = `
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<h2>Your Weekly Summary 📊</h2>
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<p>Here's what happened this week on LocalGreenChain:</p>
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<div class="stats">
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<div class="stat-item">
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<div class="stat-value">${data.plantsRegistered || 0}</div>
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<div class="stat-label">Plants Registered</div>
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</div>
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<div class="stat-item">
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<div class="stat-value">${data.carbonSaved || 0} kg</div>
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<div class="stat-label">Carbon Saved</div>
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</div>
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<div class="stat-item">
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<div class="stat-value">${data.localMiles || 0}</div>
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<div class="stat-label">Local Food Miles</div>
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</div>
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</div>
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${data.highlights ? `
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<h3>Highlights</h3>
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<ul>
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${data.highlights.map((h: string) => `<li>${h}</li>`).join('')}
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</ul>
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` : ''}
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Full Report</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getSystemAlertTemplate(payload: NotificationPayload): string {
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const content = `
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<h2>System Notification ⚙️</h2>
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<div class="alert-info">
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<strong>${payload.title}</strong><br>
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${payload.message}
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</div>
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">Learn More</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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private getDefaultTemplate(payload: NotificationPayload): string {
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const content = `
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<h2>${payload.title}</h2>
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<p>${payload.message}</p>
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${payload.actionUrl ? `<a href="${payload.actionUrl}" class="button">View Details</a>` : ''}
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`;
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return this.getBaseLayout(content, payload);
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}
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}
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