github.com/psiphon-Labs/psiphon-tunnel-core@v2.0.28+incompatible/psiphon/common/quic/gquic-go/internal/utils/host.go (about)

     1  package utils
     2  
     3  import (
     4  	"net/url"
     5  	"strings"
     6  )
     7  
     8  // HostnameFromAddr determines the hostname in an address string
     9  func HostnameFromAddr(addr string) (string, error) {
    10  	p, err := url.Parse(addr)
    11  	if err != nil {
    12  		return "", err
    13  	}
    14  	h := p.Host
    15  
    16  	// copied from https://golang.org/src/net/http/transport.go
    17  	if hasPort(h) {
    18  		h = h[:strings.LastIndex(h, ":")]
    19  	}
    20  
    21  	return h, nil
    22  }
    23  
    24  // copied from https://golang.org/src/net/http/http.go
    25  func hasPort(s string) bool {
    26  	return strings.LastIndex(s, ":") > strings.LastIndex(s, "]")
    27  }