53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
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/**
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* Request utility functions
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* Helpers for extracting information from Express requests
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*/
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/**
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* Extract client IP address from request
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* Considers proxy headers (X-Forwarded-For, X-Real-IP)
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*
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* @param {Object} req - Express request object
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* @returns {string|null} - Client IP address or null
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*/
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function getClientIP(req) {
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try {
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// Check X-Forwarded-For header (used by proxies/load balancers)
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const forwardedFor = req.headers['x-forwarded-for'];
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if (forwardedFor) {
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// X-Forwarded-For can contain multiple IPs, take the first one (client IP)
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const ips = forwardedFor.split(',').map(ip => ip.trim());
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if (ips.length > 0 && ips[0]) {
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return ips[0];
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}
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}
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// Check X-Real-IP header (used by some proxies)
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const realIP = req.headers['x-real-ip'];
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if (realIP) {
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return realIP;
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}
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// Fallback to req.ip (Express built-in)
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if (req.ip) {
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// Express sometimes returns IPv6-mapped IPv4 (::ffff:192.168.1.1)
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// Convert to standard IPv4 format
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return req.ip.replace(/^::ffff:/, '');
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}
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// Fallback to socket remote address
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if (req.connection && req.connection.remoteAddress) {
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return req.connection.remoteAddress.replace(/^::ffff:/, '');
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}
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return null;
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} catch (error) {
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console.error('Error extracting client IP:', error);
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return null;
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}
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}
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module.exports = {
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getClientIP,
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};
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