jsd-solver-go

jsd-solver-go

Install

go get github.com/fxnatic/jsd-solver-go

Usage (full auto)

This flow:

• requests the target URL to extract __CF$cv$params (r and t)
• downloads the JSD script and deobfuscates it to extract the needed data
• posts the oneshot payload and returns cookies/body/status

package main

import (
	"fmt"
	"log"

	"github.com/fxnatic/jsd-solver-go/solver"
)

func main() {
	s, err := solver.NewSolver("https://www.example.com", false)
	if err != nil {
		log.Fatal(err)
	}

	res, err := s.Solve()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("status:", res.StatusCode)
	fmt.Println("success:", res.Success)
	fmt.Println("cf_clearance:", res.CfClearance)
}

Usage (skip homepage fetch; provide r and t)

If you don’t want this library to do the initial homepage fetch, you can provide the r and t values yourself.

You must supply:

• R and T (from the challenged page’s __CF$cv$params)
• optionally ScriptURL (otherwise the default .../jsd/main.js is used)
• optionally Cookies

data := solver.SolveData{
	R:         "…",
	T:         "…",
	ScriptURL: "https://example.com/cdn-cgi/challenge-platform/scripts/jsd/main.js", // optional
	Cookies:   cookiesFromYourOwnFetch,                                            // optional
}

res, err := s.SolveFromData(data)

Compatibility

Cloudflare changes the JSD script over time and may serve different variants per site. Because of that:

• this cannot be guaranteed to work for all sites
• when it breaks, it’s usually due to script changes requiring updates to the deobfuscation/extraction logic