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utils.go
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/
utils.go
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package limiter
import (
"math/rand"
"net"
"net/http"
"strings"
"time"
)
// GetIP returns IP address from request.
func GetIP(r *http.Request, trustForwardHeader ...bool) net.IP {
if len(trustForwardHeader) >= 1 && trustForwardHeader[0] {
ip := r.Header.Get("X-Forwarded-For")
if ip != "" {
parts := strings.SplitN(ip, ",", 2)
part := strings.TrimSpace(parts[0])
return net.ParseIP(part)
}
ip = strings.TrimSpace(r.Header.Get("X-Real-IP"))
if ip != "" {
return net.ParseIP(ip)
}
}
remoteAddr := strings.TrimSpace(r.RemoteAddr)
host, _, err := net.SplitHostPort(remoteAddr)
if err != nil {
return net.ParseIP(remoteAddr)
}
return net.ParseIP(host)
}
// GetIPKey extracts IP from request and returns hashed IP to use as store key.
func GetIPKey(r *http.Request, trustForwardHeader ...bool) string {
return GetIP(r, trustForwardHeader...).String()
}
// Random return a random integer between min and max.
func Random(min, max int) int {
rand.Seed(time.Now().Unix())
return rand.Intn(max-min) + min
}