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import { AppError, ErrorCode } from '../types/errors';
import { Logger } from '../utils/logger';
export const errorHandler = (
error: Error | AppError,
req: Request,
res: Response,
next: NextFunction
): void => {
const requestId = req.headers['x-request-id'] as string || 'unknown';
// If it's already an AppError, use it directly
if (error instanceof AppError) {
Logger.error('Application error occurred', {
requestId,
error: {
code: error.code,
message: error.message,
statusCode: error.statusCode,
details: error.details,
stack: error.stack
},
request: {
method: req.method,
url: req.url,
userAgent: req.get('User-Agent'),
ip: req.ip
}
});
res.status(error.statusCode).json(error.toJSON());
return;
}
// Handle known error types
if (error.name === 'ValidationError') {
const appError = new AppError(
ErrorCode.VALIDATION_ERROR,
'Erreur de validation',
400,
true,
undefined,
requestId
);
Logger.error('Validation error', {
requestId,
originalError: error.message,
stack: error.stack
});
res.status(400).json(appError.toJSON());
return;
}
if (error.name === 'UnauthorizedError') {
const appError = new AppError(
ErrorCode.UNAUTHORIZED,
'Non autorisé',
401,
true,
undefined,
requestId
);
Logger.error('Unauthorized access attempt', {
requestId,
error: error.message,
request: {
method: req.method,
url: req.url,
ip: req.ip
}
});
res.status(401).json(appError.toJSON());
return;
}
// Handle JSON parsing errors (body-parser SyntaxError)
if (
error.name === 'SyntaxError' ||
(typeof (error as any)?.type === 'string' && (error as any).type === 'entity.parse.failed')
) {
const appError = new AppError(
ErrorCode.VALIDATION_ERROR,
'JSON invalide',
400,
true,
undefined,
requestId
);
Logger.error('JSON parse error', {
requestId,
originalError: (error as any)?.message,
stack: (error as any)?.stack
});
res.status(400).json(appError.toJSON());
return;
}
// Handle database errors
if (error.message?.includes('database') || error.message?.includes('connection')) {
const appError = new AppError(
ErrorCode.DATABASE_ERROR,
'Erreur de base de données',
500,
true,
undefined,
requestId
);
Logger.error('Database error', {
requestId,
error: error.message,
stack: error.stack
});
res.status(500).json(appError.toJSON());
return;
}
// Generic server error
const appError = new AppError(
ErrorCode.INTERNAL_SERVER_ERROR,
'Erreur interne du serveur',
500,
false, // Non-operational error
undefined,
requestId
);
Logger.error('Unhandled error', {
requestId,
error: {
name: error.name,
message: error.message,
stack: error.stack
},
request: {
method: req.method,
url: req.url,
body: req.body,
userAgent: req.get('User-Agent'),
ip: req.ip
}
});
res.status(500).json(appError.toJSON());
};
// Middleware to catch async errors
export const asyncHandler = (fn: Function) => {
return (req: Request, res: Response, next: NextFunction) => {
Promise.resolve(fn(req, res, next)).catch(next);
};
};
// Request ID middleware
export const requestIdMiddleware = (req: Request, res: Response, next: NextFunction) => {
const requestId = req.headers['x-request-id'] as string ||
`req_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
req.headers['x-request-id'] = requestId;
res.setHeader('X-Request-ID', requestId);
next();
};
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