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utils.go
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/
utils.go
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package api
import (
"encoding/json"
"errors"
"github.com/evilsocket/islazy/log"
"net/http"
"strconv"
"strings"
)
var (
ErrEmpty = errors.New("")
ErrUnauthorized = errors.New("unauthorized")
)
func clientIP(r *http.Request) string {
address := strings.Split(r.RemoteAddr, ":")[0]
if forwardedFor := r.Header.Get("X-Forwarded-For"); forwardedFor != "" {
address = forwardedFor
}
// https://support.cloudflare.com/hc/en-us/articles/206776727-What-is-True-Client-IP-
if trueClient := r.Header.Get("True-Client-IP"); trueClient != "" {
address = trueClient
}
// handle multiple IPs case
return strings.Trim(strings.Split(address, ",")[0], " ")
}
func reqToken(r *http.Request) string {
keys := r.URL.Query()
token := keys.Get("token")
if token != "" {
return token
}
bearerToken := r.Header.Get("Authorization")
if parts := strings.Split(bearerToken, " "); len(parts) == 2 {
return parts[1]
}
return ""
}
func pageNum(r *http.Request) (int, error) {
pageParam := r.URL.Query().Get("p")
if pageParam == "" {
pageParam = "1"
}
return strconv.Atoi(pageParam)
}
func JSON(w http.ResponseWriter, statusCode int, data interface{}) {
js, err := json.Marshal(data)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(statusCode)
if sent, err := w.Write(js); err != nil {
log.Error("error sending response: %v", err)
} else {
log.Debug("sent %d bytes of json response", sent)
}
}
func ERROR(w http.ResponseWriter, statusCode int, err error) {
if err != nil {
JSON(w, statusCode, struct {
Error string `json:"error"`
}{
Error: err.Error(),
})
return
}
JSON(w, http.StatusBadRequest, nil)
}