52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package requestutil
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import (
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"net"
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"net/http"
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"strings"
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log "github.com/sirupsen/logrus"
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)
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func parseIP(ipStr string) net.IP {
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ip := net.ParseIP(ipStr)
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if ip == nil {
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log.Warnf("invalid remote IP address: %q", ipStr)
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}
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return ip
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}
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// RemoteAddr extracts the remote address of the request, taking into
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// account proxy headers.
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func RemoteAddr(r *http.Request) string {
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if prior := r.Header.Get("X-Forwarded-For"); prior != "" {
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remoteAddr, _, _ := strings.Cut(prior, ",")
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remoteAddr = strings.Trim(remoteAddr, " ")
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if parseIP(remoteAddr) != nil {
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return remoteAddr
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}
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}
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// X-Real-Ip is less supported, but worth checking in the
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// absence of X-Forwarded-For
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if realIP := r.Header.Get("X-Real-Ip"); realIP != "" {
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if parseIP(realIP) != nil {
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return realIP
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}
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}
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return r.RemoteAddr
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}
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// RemoteIP extracts the remote IP of the request, taking into
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// account proxy headers.
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func RemoteIP(r *http.Request) string {
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addr := RemoteAddr(r)
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// Try parsing it as "IP:port"
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if ip, _, err := net.SplitHostPort(addr); err == nil {
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return ip
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}
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return addr
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}
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