Paul Nothaft
37 lines
953 B
JavaScript
37 lines
953 B
JavaScript
/**
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* Resolve the originating client IP address, accounting for reverse proxies.
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* Returns the first entry from X-Forwarded-For when available, otherwise falls back
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* to Express/Node connection properties.
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* @param {import('express').Request} req
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* @returns {string}
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*/
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function getClientIp(req) {
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if (!req) {
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return '';
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}
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const forwardedFor = req.headers['x-forwarded-for'];
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if (typeof forwardedFor === 'string' && forwardedFor.length > 0) {
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const [firstIp] = forwardedFor.split(',').map(part => part.trim()).filter(Boolean);
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if (firstIp) {
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return firstIp;
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}
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} else if (Array.isArray(forwardedFor) && forwardedFor.length > 0) {
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const [firstIp] = forwardedFor;
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if (firstIp) {
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return firstIp.trim();
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}
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}
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return (
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req.ip ||
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req.connection?.remoteAddress ||
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req.socket?.remoteAddress ||
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req.connection?.socket?.remoteAddress ||
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''
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);
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}
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module.exports = { getClientIp };
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