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// Copyright (c) 2018 Yamagishi Kazutoshi <ykzts@desire.sh>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package manael // import "manael.org/x/manael"
import (
"net/http"
"strings"
)
var client http.Client
func xff(r *http.Request) string {
var ips []string
if s := r.Header.Get("X-Forwarded-For"); s != "" {
for _, ip := range strings.Split(s, ",") {
ips = append(ips, strings.TrimSpace(ip))
}
}
ips = append(ips, r.RemoteAddr)
return strings.Join(ips[:], ",")
}
func request(url string, r *http.Request) (resp *http.Response, err error) {
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, err
}
req.Header.Add("User-Agent", r.Header.Get("User-Agent"))
req.Header.Add("X-Forwarded-For", xff(r))
for _, h := range []string{"X-Forwarded-Proto", "If-Modified-Since", "If-None-Match"} {
v := r.Header.Get(h)
if v != "" {
req.Header.Add(h, v)
}
}
resp, err = client.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}