klz-cables.com/app/errors/api/relay/route.ts

import { NextRequest, NextResponse } from 'next/server';
import { getServerAppServices } from '@/lib/services/create-services.server';
import { config } from '@/lib/config';

/**
 * Smart Proxy / Relay for Sentry/GlitchTip events.
 *
 * This Route Handler receives Sentry envelopes from the client,
 * injects the correct DSN if needed, and forwards them to the
 * internal GlitchTip/Sentry instance.
 *
 * This hides the real DSN from the client and bypasses ad-blockers
 * that target Sentry's default ingest endpoints.
 */
export async function POST(request: NextRequest) {
  const services = getServerAppServices();
  const logger = services.logger.child({ component: 'sentry-relay' });

  try {
    // Prevent 403 Forbidden console noise in local dev
    if (process.env.NODE_ENV === 'development') {
      return NextResponse.json({ status: 'ignored_in_dev' }, { status: 200 });
    }

    const envelope = await request.text();

    // Sentry envelopes can contain multiple parts separated by newlines
    const lines = envelope.split('\n');
    if (lines.length < 1) {
      return NextResponse.json({ error: 'Empty envelope' }, { status: 400 });
    }

    JSON.parse(lines[0]);
    const realDsn = config.errors.glitchtip.dsn;

    if (!realDsn) {
      logger.warn('Sentry relay received but no SENTRY_DSN configured on server');
      return NextResponse.json({ status: 'ignored' }, { status: 200 });
    }

    const dsnUrl = new URL(realDsn);
    const projectId = dsnUrl.pathname.replace('/', '');
    const sentryKey = dsnUrl.username;
    const relayUrl = `${dsnUrl.protocol}//${dsnUrl.host}/api/${projectId}/envelope/?sentry_key=${sentryKey}`;

    logger.debug('Relaying Sentry envelope', {
      projectId,
      host: dsnUrl.host,
    });

    const response = await fetch(relayUrl, {
      method: 'POST',
      body: envelope,
      headers: {
        'Content-Type': 'application/x-sentry-envelope',
      },
    });

    if (!response.ok) {
      const errorText = await response.text();
      logger.error('Sentry/GlitchTip API responded with error', {
        status: response.status,
        error: errorText.slice(0, 100),
      });
      return new NextResponse(errorText, { status: response.status });
    }

    return NextResponse.json({ status: 'ok' });
  } catch (error) {
    logger.error('Failed to relay Sentry request', {
      error: (error as Error).message,
    });
    return NextResponse.json({ error: 'Internal Server Error' }, { status: 500 });
  }
}