http-wokou/pkg/controller.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 (
	"log"
	"net/http"
	"net/http/cookiejar"
	"net/url"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/patrickmn/go-cache"
	"golang.org/x/net/publicsuffix"
)

// Implementing a 'set'
var NonmutableHeaders = map[string]struct{}{
	"Cookie":          struct{}{},
	"User-Agent":      struct{}{},
	"Accept-Encoding": struct{}{},
	"Referer":         struct{}{},
	"X-Proxy-Url":     struct{}{},
	"Host":            struct{}{},
}

type Controller struct {
	Config    *HttpServerConfig
	RouteMaps map[string]*RouteMapping
	Client    *http.Client
	SiteUrl   *url.URL
	cache     *cache.Cache
}

type ProxyCookies struct {
	ck map[*url.URL][]*http.Cookie
}

/*
Returns a new Controller struct to register routes to the gin router

	:param cfg: A pointer to an HttpServerConfig struct
*/
func NewController(cfg *HttpServerConfig, routeMapping map[string]*RouteMapping) *Controller {

	jar, err := cookiejar.New(&cookiejar.Options{PublicSuffixList: publicsuffix.List})
	if err != nil {
		log.Fatal(err)
	}

	sessCookies := cfg.CookieJar
	domain, err := url.Parse(cfg.FullDomain)
	if err != nil {
		log.Fatal(err)
	}
	jar.SetCookies(domain, sessCookies)
	cache := cache.New(24*time.Hour, 10*time.Minute)

	return &Controller{Config: cfg, Client: &http.Client{Jar: jar}, SiteUrl: domain, cache: cache, RouteMaps: routeMapping}
}

/*
This handler will be responsible for proxying out the GET requests that the server recieves
*/
func (c *Controller) Get(ctx *gin.Context) {
	incomingPath := ctx.Param("ProxiedPath")
	routeSplit := strings.Split(incomingPath, "/")
	if len(routeSplit) > 1 {
		baseRoute := strings.Join(routeSplit[:len(routeSplit)-1], "/")

		_, ok := c.RouteMaps[c.Config.AltAllowedDomain].RouteSet[baseRoute]
		if ok {
			data, ctype, rcode, err := c.RetrieveStaticResource(ctx.Request.Method, incomingPath, ctx)
			if err != nil {
				log.Fatal(err, " failed to reroute to the static domain")
			}
			ctx.Data(rcode, ctype, data)
			return
		}
	}
	_, ok := c.RouteMaps[c.Config.AltAllowedDomain].RouteSet[incomingPath]
	if ok {
		data, ctype, rcode, err := c.RetrieveStaticResource(ctx.Request.Method, incomingPath, ctx)
		if err != nil {
			log.Fatal(err, " failed to reroute to the static domain")
		}
		ctx.Data(rcode, ctype, data)
		return
	}
	_, ok = c.RouteMaps[c.Config.AllowedDomain].RouteSet[incomingPath]
	if ok {
		data, ctype, rcode, err := c.SiteauditApiCall(ctx.Request.Method, incomingPath, ctx.Request.URL.RawQuery, ctx.Request.Body, ctx)
		if err != nil {
			log.Fatal(err, " failed to route to the root domain")
		}
		ctx.Data(rcode, ctype, data)
		return
	}
	data, ctype, rcode, err := c.SemrushGeneric(ctx)
	if err != nil {
		ctx.JSON(rcode, map[string]string{
			"Error": err.Error(),
		})
		return
	}

	if incomingPath == "/" {
		ctx.Header("Location", "https://sem.bunnytools.shop/analytics/overview/")
	}
	if incomingPath == "/_compatibility/traffic/overview/" {
		ctx.Header("Location", "https://sem.bunnytools.shop/analytics/traffic/overview/ebay.com")
	}

	// TODO: this should also honestly be a configuration thing, so that i can extend page modifications
	newBody := strings.ReplaceAll(string(data), "\"srf-browser-unhappy\"", "\"srf-browser-unhappy\" style=\"display:none;\"")
	newBody = strings.ReplaceAll(newBody, "\"srf-navbar__right\"", "\"srf-navbar__right\" style=\"display:none;\"")
	newBody = strings.ReplaceAll(newBody, "<footer", "<footer style=\"display:none;\"")
	newBody = strings.ReplaceAll(newBody, "\"srf-report-sidebar-extras\"", "\"srf-report-sidebar-extra\" style=\"display:none;\"")
	newBody = strings.ReplaceAll(newBody, c.Config.AllowedDomain, c.Config.ProxyAddr)
	newBody = strings.ReplaceAll(newBody, c.Config.AltAllowedDomain, c.Config.ProxyAddr)
	ctx.Data(rcode, ctype, []byte(newBody))
}