http-wokou/pkg/controller.go

package httpserver

import (
	"log"
	"net/http"
	"net/http/cookiejar"
	"net/url"
	"strings"

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

// TODO: does tihs need to be a configuration thing? How would i handle doing rewrite rules?
var staticRoutes = [...]string{
	"/siteaudit/i18n/messages_en",
	"/siteaudit/index/",
	"/siteaudit/review/",
	"/seo-dashboard/release/",
	"/competitive-list-widget/",
	"/backlink-audit/landing/",
	"/link-building-tool/landing/",
	"/keyword-overview/",
	"/keyword-gap/",
	"/oti/prod/organic_traffic_insights/",
	"/oti/prod/organic-traffic-insights",
	"/ajst/",
	"/listing-management/landings/",
	"/listing-management/landing-reviews/",
	"/messaging/apps/",
	"/domain-overview/",
	"/traffic-analytics/",
	"/organic-research/",
	"/keyword-magic/kmt_",
	"/keyword-manager-assets/",
	"/position-tracking/landing/",
}

var apiRoutes = [...]string{
	"/projects/api/",
	"/siteaudit/api/",
}

// 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
	Client  *http.Client
	SiteUrl *url.URL
}

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) *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)

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

/*
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")
	for idx := range staticRoutes {
		if strings.Contains(incomingPath, staticRoutes[idx]) {
			data, ctype, rcode, err := c.RetrieveStaticResource(incomingPath, ctx)
			if err != nil {
				log.Fatal(err, "reroute to the static domain")
			}
			ctx.Data(rcode, ctype, data)
			return
		}
	}
	for idx := range apiRoutes {
		if strings.Contains(incomingPath, apiRoutes[idx]) {
			data, ctype, 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(200, ctype, data)
			return
		}
	}

	data, ctype, rcode, err := c.SemrushGeneric(ctx.Request.Method, incomingPath, ctx.Request.Body, 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, "static.semrush.com", c.Config.ProxyAddr)
	ctx.Data(rcode, ctype, []byte(newBody))
}