All files / src/app/api/email/unsubscribe route.ts

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/**
 * Email Unsubscribe API
 *
 * Handles one-click unsubscribe from marketing emails.
 * Redirects to success or error page after processing.
 */

import { NextRequest, NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';
import { verifyUnsubscribeToken, isValidUnsubscribeType } from '@/lib/email/tokens';
import { logger } from '@/lib/logging';

// Prevent static generation
export const dynamic = 'force-dynamic';

/**
 * GET /api/email/unsubscribe?token=xxx&type=all
 *
 * Process unsubscribe request from email link
 */
export async function GET(request: NextRequest): Promise<NextResponse> {
  const { searchParams } = new URL(request.url);
  const token = searchParams.get('token');
  const typeParam = searchParams.get('type');
  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || process.env.NEXTAUTH_URL || 'http://localhost:3000';

  // Validate token is present
  if (!token) {
    logger.warn('Unsubscribe attempt without token', { category: 'EMAIL' });
    return NextResponse.redirect(`${baseUrl}/unsubscribe-error?reason=missing-token`);
  }

  // Verify and decode token
  const payload = verifyUnsubscribeToken(token);

  if (!payload) {
    logger.warn('Invalid or expired unsubscribe token', { category: 'EMAIL' });
    return NextResponse.redirect(`${baseUrl}/unsubscribe-error?reason=invalid-token`);
  }

  // Use type from query param if valid, otherwise use type from token
  const unsubscribeType = (typeParam && isValidUnsubscribeType(typeParam))
    ? typeParam
    : payload.type;

  try {
    // Build update data based on type
    const updateData: Record<string, boolean> = {};

    switch (unsubscribeType) {
      case 'all':
        updateData.unsubscribeAll = true;
        updateData.promotions = false;
        updateData.newsletters = false;
        updateData.productAlerts = false;
        break;
      case 'promotions':
        updateData.promotions = false;
        break;
      case 'newsletters':
        updateData.newsletters = false;
        break;
      case 'productAlerts':
        updateData.productAlerts = false;
        break;
    }

    // Update or create email preferences
    await prisma.emailPreference.upsert({
      where: { userId: payload.userId },
      create: {
        userId: payload.userId,
        ...updateData
      },
      update: updateData
    });

    logger.info(`User ${payload.userId} unsubscribed from ${unsubscribeType} emails`, { category: 'EMAIL' });

    // Redirect to success page
    return NextResponse.redirect(
      `${baseUrl}/unsubscribe-success?type=${unsubscribeType}`
    );
  } catch (error) {
    logger.error('Unsubscribe failed', error instanceof Error ? error : new Error(String(error)), { category: 'EMAIL' });
    return NextResponse.redirect(`${baseUrl}/unsubscribe-error?reason=server-error`);
  }
}

/**
 * POST /api/email/unsubscribe
 *
 * Alternative method for unsubscribe (for forms)
 */
export async function POST(request: NextRequest): Promise<NextResponse> {
  try {
    const body = await request.json();
    const { token, type } = body;

    if (!token) {
      return NextResponse.json(
        { error: 'Missing token' },
        { status: 400 }
      );
    }

    const payload = verifyUnsubscribeToken(token);

    if (!payload) {
      return NextResponse.json(
        { error: 'Invalid or expired token' },
        { status: 400 }
      );
    }

    const unsubscribeType = (type && isValidUnsubscribeType(type))
      ? type
      : payload.type;

    // Build update data
    const updateData: Record<string, boolean> = {};

    switch (unsubscribeType) {
      case 'all':
        updateData.unsubscribeAll = true;
        updateData.promotions = false;
        updateData.newsletters = false;
        updateData.productAlerts = false;
        break;
      case 'promotions':
        updateData.promotions = false;
        break;
      case 'newsletters':
        updateData.newsletters = false;
        break;
      case 'productAlerts':
        updateData.productAlerts = false;
        break;
    }

    await prisma.emailPreference.upsert({
      where: { userId: payload.userId },
      create: {
        userId: payload.userId,
        ...updateData
      },
      update: updateData
    });

    logger.info(`User ${payload.userId} unsubscribed from ${unsubscribeType} emails (POST)`, { category: 'EMAIL' });

    return NextResponse.json({
      success: true,
      message: `Successfully unsubscribed from ${unsubscribeType} emails`
    });
  } catch (error) {
    logger.error('Unsubscribe POST failed', error instanceof Error ? error : new Error(String(error)), { category: 'EMAIL' });
    return NextResponse.json(
      { error: 'Failed to process unsubscribe request' },
      { status: 500 }
    );
  }
}