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// Copyright 2018 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package request
import (
"fmt"
"net"
"net/http"
"strconv"
"strings"
"github.com/gorilla/mux"
)
// Cookie returns the cookie value.
func Cookie(r *http.Request, name string) string {
cookie, err := r.Cookie(name)
if err == http.ErrNoCookie {
return ""
}
return cookie.Value
}
// FormInt64Value returns a form value as integer.
func FormInt64Value(r *http.Request, param string) int64 {
value := r.FormValue(param)
integer, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return 0
}
return integer
}
// IntParam returns an URL route parameter as integer.
func IntParam(r *http.Request, param string) (int64, error) {
vars := mux.Vars(r)
value, err := strconv.Atoi(vars[param])
if err != nil {
return 0, fmt.Errorf("request: %s parameter is not an integer", param)
}
if value < 0 {
return 0, nil
}
return int64(value), nil
}
// Param returns an URL route parameter as string.
func Param(r *http.Request, param, defaultValue string) string {
vars := mux.Vars(r)
value := vars[param]
if value == "" {
value = defaultValue
}
return value
}
// QueryParam returns a querystring parameter as string.
func QueryParam(r *http.Request, param, defaultValue string) string {
value := r.URL.Query().Get(param)
if value == "" {
value = defaultValue
}
return value
}
// QueryIntParam returns a querystring parameter as integer.
func QueryIntParam(r *http.Request, param string, defaultValue int) int {
return int(QueryInt64Param(r, param, int64(defaultValue)))
}
// QueryInt64Param returns a querystring parameter as int64.
func QueryInt64Param(r *http.Request, param string, defaultValue int64) int64 {
value := r.URL.Query().Get(param)
if value == "" {
return defaultValue
}
val, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return defaultValue
}
if val < 0 {
return defaultValue
}
return val
}
// HasQueryParam checks if the query string contains the given parameter.
func HasQueryParam(r *http.Request, param string) bool {
values := r.URL.Query()
_, ok := values[param]
return ok
}
// RealIP returns client's real IP address.
func RealIP(r *http.Request) string {
headers := []string{"X-Forwarded-For", "X-Real-Ip"}
for _, header := range headers {
value := r.Header.Get(header)
if value != "" {
addresses := strings.Split(value, ",")
address := strings.TrimSpace(addresses[0])
if net.ParseIP(address) != nil {
return address
}
}
}
// Fallback to TCP/IP source IP address.
var remoteIP string
if strings.ContainsRune(r.RemoteAddr, ':') {
remoteIP, _, _ = net.SplitHostPort(r.RemoteAddr)
} else {
remoteIP = r.RemoteAddr
}
return remoteIP
}
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