code.vegaprotocol.io/vega@v0.79.0/libs/http/remoteaddr.go (about)

     1  // Copyright (C) 2023 Gobalsky Labs Limited
     2  //
     3  // This program is free software: you can redistribute it and/or modify
     4  // it under the terms of the GNU Affero General Public License as
     5  // published by the Free Software Foundation, either version 3 of the
     6  // License, or (at your option) any later version.
     7  //
     8  // This program is distributed in the hope that it will be useful,
     9  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    10  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    11  // GNU Affero General Public License for more details.
    12  //
    13  // You should have received a copy of the GNU Affero General Public License
    14  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    15  
    16  package http
    17  
    18  import (
    19  	"fmt"
    20  	"net"
    21  	"net/http"
    22  )
    23  
    24  // RemoteAddr collects possible remote addresses from a request.
    25  func RemoteAddr(r *http.Request) (string, error) {
    26  	// Only defined when site is accessed via non-anonymous proxy
    27  	// and takes precedence over RemoteAddr
    28  	remote := r.Header.Get("X-Forwarded-For")
    29  	if remote != "" {
    30  		return remote, nil
    31  	}
    32  
    33  	ip, _, err := net.SplitHostPort(r.RemoteAddr)
    34  	if err != nil {
    35  		return "", fmt.Errorf("unable to get remote address (failed to split host:port) from \"%s\": %v", r.RemoteAddr, err)
    36  	}
    37  
    38  	return ip, nil
    39  }