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import { NextResponse } from 'next/server';
import { logger } from '@/lib/logging';
import { prisma } from '@/lib/prisma';
import crypto from 'crypto';
/**
* Client Log Entry from browser
*/
interface ClientLogEntry {
level: 'debug' | 'info' | 'warn' | 'error';
message: string;
data?: Record<string, unknown>;
timestamp: string;
url: string;
userAgent: string;
sessionId?: string;
error?: {
name: string;
message: string;
stack?: string;
};
}
/**
* Request body schema
*/
interface ClientLogsRequest {
entries: ClientLogEntry[];
}
/**
* Validate client log entry
*/
function isValidLogEntry(entry: unknown): entry is ClientLogEntry {
if (!entry || typeof entry !== 'object') return false;
const e = entry as Record<string, unknown>;
return (
typeof e.level === 'string' &&
['debug', 'info', 'warn', 'error'].includes(e.level) &&
typeof e.message === 'string' &&
typeof e.timestamp === 'string' &&
typeof e.url === 'string' &&
typeof e.userAgent === 'string'
);
}
/**
* Generate fingerprint for log grouping
*/
function generateFingerprint(entry: ClientLogEntry): string {
const content = `${entry.level}:${entry.message}:${entry.error?.name || ''}`;
return crypto.createHash('md5').update(content).digest('hex');
}
/**
* Extract client IP from request headers
*/
function getClientIp(request: Request): string | undefined {
return (
request.headers.get('x-forwarded-for')?.split(',')[0]?.trim() ||
request.headers.get('x-real-ip') ||
undefined
);
}
/**
* POST /api/monitoring/client-logs
*
* Receives batched client-side logs for server-side aggregation and storage.
*
* Rate limited to prevent abuse.
*/
export async function POST(request: Request) {
// Skip in mock mode (E2E tests) - just return success
if (process.env.USE_MOCK_DATA === 'true') {
return NextResponse.json({ success: true, stored: 0 });
}
const requestLogger = logger.withContext({
path: '/api/monitoring/client-logs',
method: 'POST',
});
try {
// Parse request body
const body = (await request.json()) as ClientLogsRequest;
// Validate entries array
if (!body.entries || !Array.isArray(body.entries)) {
return NextResponse.json(
{ error: 'Invalid request body: entries array required' },
{ status: 400 }
);
}
// Limit batch size to prevent abuse
const MAX_BATCH_SIZE = 50;
const entries = body.entries.slice(0, MAX_BATCH_SIZE);
// Filter valid entries
const validEntries = entries.filter(isValidLogEntry);
if (validEntries.length === 0) {
return NextResponse.json(
{ error: 'No valid log entries provided' },
{ status: 400 }
);
}
const clientIp = getClientIp(request);
let processedCount = 0;
let errorCount = 0;
// Process each entry
for (const entry of validEntries) {
try {
// Log to server-side logger
const logData = {
type: 'client_log',
clientSessionId: entry.sessionId,
clientUrl: entry.url,
clientUserAgent: entry.userAgent,
clientIp,
clientTimestamp: entry.timestamp,
...entry.data,
};
switch (entry.level) {
case 'debug':
requestLogger.debug(`[Client] ${entry.message}`, logData);
break;
case 'info':
requestLogger.info(`[Client] ${entry.message}`, logData);
break;
case 'warn':
requestLogger.warn(`[Client] ${entry.message}`, logData);
break;
case 'error':
requestLogger.error(`[Client] ${entry.message}`, entry.error ? new Error(entry.error.message) : undefined, logData);
break;
}
// Store errors and warnings in database for monitoring
if (entry.level === 'error' || entry.level === 'warn') {
const fingerprint = generateFingerprint(entry);
await prisma.errorLog.create({
data: {
fingerprint,
level: entry.level,
category: 'CLIENT',
message: entry.message.substring(0, 1000),
stack: entry.error?.stack?.substring(0, 5000),
url: entry.url.substring(0, 500),
userAgent: entry.userAgent.substring(0, 500),
ip: clientIp?.substring(0, 45),
requestId: entry.sessionId?.substring(0, 100),
metadata: {
clientTimestamp: entry.timestamp,
errorName: entry.error?.name,
...entry.data,
},
},
});
// Update error statistics
await prisma.errorStatistic.upsert({
where: { fingerprint },
update: {
count: { increment: 1 },
lastSeen: new Date(),
},
create: {
fingerprint,
category: 'CLIENT',
message: entry.message.substring(0, 500),
count: 1,
firstSeen: new Date(),
lastSeen: new Date(),
},
});
}
processedCount++;
} catch (err) {
errorCount++;
requestLogger.error('Failed to process client log entry', err as Error, {
entryMessage: entry.message,
});
}
}
requestLogger.info('Client logs processed', {
receivedCount: validEntries.length,
processedCount,
errorCount,
});
return NextResponse.json({
success: true,
processed: processedCount,
errors: errorCount,
});
} catch (error) {
requestLogger.error('Failed to process client logs', error as Error);
return NextResponse.json(
{ error: 'Failed to process logs' },
{ status: 500 }
);
}
}
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