package http
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import (
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"net/http"
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"strconv"
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"strings"
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"github.com/v2fly/v2ray-core/v5/common/net"
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)
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// ParseXForwardedFor parses X-Forwarded-For header in http headers, and return the IP list in it.
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func ParseXForwardedFor(header http.Header) []net.Address {
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xff := header.Get("X-Forwarded-For")
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if xff == "" {
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return nil
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}
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list := strings.Split(xff, ",")
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addrs := make([]net.Address, 0, len(list))
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for _, proxy := range list {
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addrs = append(addrs, net.ParseAddress(proxy))
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}
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return addrs
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}
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// RemoveHopByHopHeaders remove hop by hop headers in http header list.
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func RemoveHopByHopHeaders(header http.Header) {
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// Strip hop-by-hop header based on RFC:
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
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// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
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header.Del("Proxy-Connection")
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header.Del("Proxy-Authenticate")
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header.Del("Proxy-Authorization")
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header.Del("TE")
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header.Del("Trailers")
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header.Del("Transfer-Encoding")
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header.Del("Upgrade")
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connections := header.Get("Connection")
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header.Del("Connection")
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if connections == "" {
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return
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}
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for _, h := range strings.Split(connections, ",") {
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header.Del(strings.TrimSpace(h))
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}
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}
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// ParseHost splits host and port from a raw string. Default port is used when raw string doesn't contain port.
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func ParseHost(rawHost string, defaultPort net.Port) (net.Destination, error) {
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port := defaultPort
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host, rawPort, err := net.SplitHostPort(rawHost)
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if err != nil {
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if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
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host = rawHost
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} else {
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return net.Destination{}, err
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}
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} else if len(rawPort) > 0 {
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intPort, err := strconv.ParseUint(rawPort, 0, 16)
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if err != nil {
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return net.Destination{}, err
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}
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port = net.Port(intPort)
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}
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return net.TCPDestination(net.ParseAddress(host), port), nil
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}
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