http-wokou/pkg/controller.go

package httpserver

import (
	"fmt"
	"io"
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
)

type Controller struct {
	Config *HttpServerConfig
}

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

	:param cfg: A pointer to an HttpServerConfig struct
*/
func NewController(cfg *HttpServerConfig) *Controller {
	return &Controller{Config: cfg}
}

/*
This handler will be responsible for proxying out the GET requests that the server recieves
*/
func (c *Controller) Get(ctx *gin.Context) {

	url := fmt.Sprintf("https://%s%s", c.Config.AllowedDomain, ctx.Param("ProxiedPath"))
	req, err := http.NewRequest(ctx.Request.Method, url, ctx.Request.Body)
	if err != nil {
		ctx.JSON(500, map[string]string{
			"Error": "Error creating the request.",
			"Msg:":  err.Error(),
		})
		return
	}
	req.URL.Path = ctx.Param("ProxiedPath")
	req.Header.Add("User-Agent", c.Config.UserAgent)
	req.Header.Set("Referer", c.Config.AllowedDomain)
	for idx := range c.Config.CookieJar {
		req.AddCookie(c.Config.CookieJar[idx])
	}
	if ctx.Param("ProxiedPath") == "/" {
		req.Header.Add("Location", "https://sem.bunnytools.shop/analytics/overview/")
	}
	if ctx.Param("ProxiedPath") == "/_compatibility/traffic/overview/" {
		req.Header.Add("Location", "https://sem.bunnytools.shop/analytics/traffic/overview/ebay.com")
	}
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		ctx.JSON(500, map[string]string{
			"Error": "Error creating the request.",
			"Msg:":  err.Error(),
		})
		return
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		ctx.JSON(500, map[string]string{
			"Error": "Error creating the request.",
			"Msg:":  err.Error(),
		})
		return
	}

	newBody := strings.ReplaceAll(string(b), "\"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, "www.semrush.com", "sem.bunnytools.shop")
	ctx.Data(resp.StatusCode, resp.Header.Get("Content-Type"), []byte(newBody))

}