73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package limiter
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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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)
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var (
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// DefaultIPv4Mask defines the default IPv4 mask used to obtain user IP.
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DefaultIPv4Mask = net.CIDRMask(32, 32)
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// DefaultIPv6Mask defines the default IPv6 mask used to obtain user IP.
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DefaultIPv6Mask = net.CIDRMask(128, 128)
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)
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// GetIP returns IP address from request.
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func (limiter *Limiter) GetIP(r *http.Request) net.IP {
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return GetIP(r, limiter.Options)
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}
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// GetIPWithMask returns IP address from request by applying a mask.
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func (limiter *Limiter) GetIPWithMask(r *http.Request) net.IP {
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return GetIPWithMask(r, limiter.Options)
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}
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// GetIPKey extracts IP from request and returns hashed IP to use as store key.
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func (limiter *Limiter) GetIPKey(r *http.Request) string {
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return limiter.GetIPWithMask(r).String()
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}
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// GetIP returns IP address from request.
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// If options is defined and TrustForwardHeader is true, it will lookup IP in
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// X-Forwarded-For and X-Real-IP headers.
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func GetIP(r *http.Request, options ...Options) net.IP {
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if len(options) >= 1 && options[0].TrustForwardHeader {
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ip := r.Header.Get("X-Forwarded-For")
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if ip != "" {
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parts := strings.SplitN(ip, ",", 2)
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part := strings.TrimSpace(parts[0])
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return net.ParseIP(part)
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}
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ip = strings.TrimSpace(r.Header.Get("X-Real-IP"))
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if ip != "" {
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return net.ParseIP(ip)
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}
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}
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remoteAddr := strings.TrimSpace(r.RemoteAddr)
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host, _, err := net.SplitHostPort(remoteAddr)
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if err != nil {
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return net.ParseIP(remoteAddr)
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}
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return net.ParseIP(host)
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}
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// GetIPWithMask returns IP address from request by applying a mask.
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func GetIPWithMask(r *http.Request, options ...Options) net.IP {
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if len(options) == 0 {
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return GetIP(r)
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}
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ip := GetIP(r, options[0])
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if ip.To4() != nil {
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return ip.Mask(options[0].IPv4Mask)
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}
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if ip.To16() != nil {
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return ip.Mask(options[0].IPv6Mask)
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}
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return ip
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}
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