1 files changed, 71 insertions, 0 deletions
diff --git a/vendor/github.com/tomasen/realip/realip.go b/vendor/github.com/tomasen/realip/realip.go
new file mode 100644
index 0000000..09ed74d
--- /dev/null
+++ b/vendor/github.com/tomasen/realip/realip.go
@@ -0,0 +1,71 @@
+package realip
+
+import (
+	"log"
+	"net"
+	"net/http"
+	"strings"
+)
+
+var cidrs []*net.IPNet
+
+func init() {
+	lancidrs := []string{
+		"127.0.0.1/8", "10.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.168.0.0/16", "::1/128", "fc00::/7",
+	}
+
+	cidrs = make([]*net.IPNet, len(lancidrs))
+
+	for i, it := range lancidrs {
+		_, cidrnet, err := net.ParseCIDR(it)
+		if err != nil {
+			log.Fatalf("ParseCIDR error: %v", err) // assuming I did it right above
+		}
+
+		cidrs[i] = cidrnet
+	}
+}
+
+func isLocalAddress(addr string) bool {
+	for i := range cidrs {
+		myaddr := net.ParseIP(addr)
+		if cidrs[i].Contains(myaddr) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Request.RemoteAddress contains port, which we want to remove i.e.:
+// "[::1]:58292" => "[::1]"
+func ipAddrFromRemoteAddr(s string) string {
+	idx := strings.LastIndex(s, ":")
+	if idx == -1 {
+		return s
+	}
+	return s[:idx]
+}
+
+// RealIP return client's real public IP address
+// from http request headers.
+func RealIP(r *http.Request) string {
+	hdr := r.Header
+	hdrRealIP := hdr.Get("X-Real-Ip")
+	hdrForwardedFor := hdr.Get("X-Forwarded-For")
+
+	if len(hdrForwardedFor) == 0 && len(hdrRealIP) == 0 {
+		return ipAddrFromRemoteAddr(r.RemoteAddr)
+	}
+
+	// X-Forwarded-For is potentially a list of addresses separated with ","
+	for _, addr := range strings.Split(hdrForwardedFor, ",") {
+		// return first non-local address
+		addr = strings.TrimSpace(addr)
+		if len(addr) > 0 && !isLocalAddress(addr) {
+			return addr
+		}
+	}
+
+	return hdrRealIP
+}