http-wokou/pkg/client.go

/*
		GNU GENERAL PUBLIC LICENSE
                 Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

 http-wokou, An HTTP Proxying framework for bypassing DNS Security
 Copyright (C) 2024 Russell Hrubesky, ChiralWorks Software LLC

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/

package httpserver

import (
	"bytes"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"
	"sync"
)

type ResponseCarrier struct {
	Data       []byte
	Headers    http.Header
	StatusCode int
	Error      error
}

/*
Generic site call to an upstream server
*/
func (c *Controller) RequestGeneric(method string, host string, path string, hdrs *http.Header, body io.Reader) ResponseCarrier {
	reqUrl := fmt.Sprintf("%s://%s%s", "http", host, path)
	req, err := http.NewRequest(method, reqUrl, body)
	if err != nil {
		return ResponseCarrier{Data: nil, Headers: nil, StatusCode: 500, Error: err}
	}
	resp, err := c.Client.Do(req)
	if err != nil {
		return ResponseCarrier{Data: nil, Headers: nil, StatusCode: 500, Error: err}
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return ResponseCarrier{Data: nil, Headers: resp.Header, StatusCode: resp.StatusCode, Error: err}
	}
	bytes.ReplaceAll(b, []byte(c.Config.TargetDomain), []byte(c.Config.ProxyDomain))

	if c.Config.Caching {
		if !strings.Contains(path, "?") {
			if resp.StatusCode == 200 {
				if method == "GET" {
					c.CacheResource(path, NewCachedResource(b, &resp.Header, resp.StatusCode))
				}
			}
		}
	}
	return ResponseCarrier{Data: b, Headers: resp.Header, StatusCode: resp.StatusCode, Error: nil}

}

func (c *Controller) TryHosts(method string, path string, hdrs *http.Header, body io.Reader, hosts []string) {
	var wg sync.WaitGroup
	for idx := range hosts {
		wg.Add(1)
		go func(method string, host string, path string, hdrs *http.Header, body io.Reader) {
			defer wg.Done()
			resp := c.RequestGeneric(method, host, path, hdrs, body)
			if resp.Error != nil {
				log.Fatal("Fatal Error creating request in a RequestGeneric method: ", resp.Error)
			}
			if resp.StatusCode == 200 {
				basePath := strings.Split(path, "?")[0]
				c.RouteMaps.MapUriToDomain(basePath, host)
			}
		}(method, hosts[idx], path, hdrs, body)
	}
	wg.Wait()

}

/*
Sets the request headers to whatever is defined in this private method

	:param req: a pointer to an HTTP request
*/
func (c *Controller) setHeaders(req *http.Request, hdrs *http.Header) {

	//req.AddCookie(c.Config.PhpSession)
	//req.Header.Set("User-Agent", c.Config.UserAgent)
	//req.Header.Set("Referer", c.Config.FullDomain)
	//req.Header.Set("Origin", c.Config.FullDomain)
	for k, v := range *hdrs {
		_, ok := NonmutableHeaders[k]
		if !ok {
			req.Header.Add(k, v[0])
		}
	}

}