File size: 3,925 Bytes
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const isIPv4Loopback = (host) => {
const parts = host.split('.');
if (parts.length !== 4) return false;
if (parts[0] !== '127') return false;
return parts.every((p) => /^\d+$/.test(p) && Number(p) >= 0 && Number(p) <= 255);
};
const isIPv6Loopback = (host) => {
// Collapse all-zero groups: any form of ::1 / 0:0:...:0:1
// First, strip any leading "::" by normalising with Set lookup of common forms,
// then fall back to structural check.
if (host === '::1') return true;
// Check IPv4-mapped IPv6 loopback: ::ffff:<v4-loopback> or ::ffff:<hex-v4-loopback>
// Node's URL parser normalises ::ffff:127.0.0.1 → ::ffff:7f00:1
const v4MappedDotted = host.match(/^::ffff:(\d+\.\d+\.\d+\.\d+)$/i);
if (v4MappedDotted) return isIPv4Loopback(v4MappedDotted[1]);
const v4MappedHex = host.match(/^::ffff:([0-9a-f]{1,4}):([0-9a-f]{1,4})$/i);
if (v4MappedHex) {
const high = parseInt(v4MappedHex[1], 16);
// High 16 bits must start with 127 (0x7f) — i.e. 0x7f00..0x7fff
return high >= 0x7f00 && high <= 0x7fff;
}
// Full-form ::1 variants: any number of zero groups followed by trailing 1
// e.g. 0:0:0:0:0:0:0:1, 0000:...:0001
const groups = host.split(':');
if (groups.length === 8) {
for (let i = 0; i < 7; i++) {
if (!/^0+$/.test(groups[i])) return false;
}
return /^0*1$/.test(groups[7]);
}
return false;
};
const isLoopback = (host) => {
if (!host) return false;
if (LOOPBACK_HOSTNAMES.has(host)) return true;
if (isIPv4Loopback(host)) return true;
return isIPv6Loopback(host);
};
const DEFAULT_PORTS = {
http: 80,
https: 443,
ws: 80,
wss: 443,
ftp: 21,
};
const parseNoProxyEntry = (entry) => {
let entryHost = entry;
let entryPort = 0;
if (entryHost.charAt(0) === '[') {
const bracketIndex = entryHost.indexOf(']');
if (bracketIndex !== -1) {
const host = entryHost.slice(1, bracketIndex);
const rest = entryHost.slice(bracketIndex + 1);
if (rest.charAt(0) === ':' && /^\d+$/.test(rest.slice(1))) {
entryPort = Number.parseInt(rest.slice(1), 10);
}
return [host, entryPort];
}
}
const firstColon = entryHost.indexOf(':');
const lastColon = entryHost.lastIndexOf(':');
if (
firstColon !== -1 &&
firstColon === lastColon &&
/^\d+$/.test(entryHost.slice(lastColon + 1))
) {
entryPort = Number.parseInt(entryHost.slice(lastColon + 1), 10);
entryHost = entryHost.slice(0, lastColon);
}
return [entryHost, entryPort];
};
const normalizeNoProxyHost = (hostname) => {
if (!hostname) {
return hostname;
}
if (hostname.charAt(0) === '[' && hostname.charAt(hostname.length - 1) === ']') {
hostname = hostname.slice(1, -1);
}
return hostname.replace(/\.+$/, '');
};
export default function shouldBypassProxy(location) {
let parsed;
try {
parsed = new URL(location);
} catch (_err) {
return false;
}
const noProxy = (process.env.no_proxy || process.env.NO_PROXY || '').toLowerCase();
if (!noProxy) {
return false;
}
if (noProxy === '*') {
return true;
}
const port =
Number.parseInt(parsed.port, 10) || DEFAULT_PORTS[parsed.protocol.split(':', 1)[0]] || 0;
const hostname = normalizeNoProxyHost(parsed.hostname.toLowerCase());
return noProxy.split(/[\s,]+/).some((entry) => {
if (!entry) {
return false;
}
let [entryHost, entryPort] = parseNoProxyEntry(entry);
entryHost = normalizeNoProxyHost(entryHost);
if (!entryHost) {
return false;
}
if (entryPort && entryPort !== port) {
return false;
}
if (entryHost.charAt(0) === '*') {
entryHost = entryHost.slice(1);
}
if (entryHost.charAt(0) === '.') {
return hostname.endsWith(entryHost);
}
return hostname === entryHost || (isLoopback(hostname) && isLoopback(entryHost));
});
}
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