How to Solve reCAPTCHA v2 with Rust

Well, as you surely know, reCAPTCHA, which we see everywhere, has a very supportive roll in cybersecurity, and it's an important tool for protecting websites from many automated attacks. Developers, however, sometimes need to automate these challenges in order to legally access, say, publicly available data, so some help is needed. That's where this article comes in, and will guide you through the automated resolution of reCAPTCHA v2 using Rust and the CapSolver API to give you an idea of what you need to automate!

What is Rust

Rust is a modern systems programming language known for its performance and safety. It was designed to provide memory safety without a garbage collector, making it an excellent choice for high-performance applications. Rust ensures memory safety through its unique ownership model, preventing common bugs such as null pointer dereferences and data races.

Why Use Rust in Web Scraping

Rust is an excellent choice for web scraping due to its combination of performance, safety, and concurrency. It offers the speed of C/C++, which is essential for efficiently handling large volumes of data. Rust's strong type system and memory safety features prevent crashes and bugs, ensuring that your scraping application runs reliably. Additionally, Rust's concurrency model allows for writing safe and efficient multi-threaded code, significantly speeding up the scraping process. The language also boasts a growing ecosystem with libraries like reqwest for HTTP requests and serde for JSON parsing, making it easier to build robust web scraping tools.

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⚙️ Prerequisites

Before getting started, ensure you have the following:

• Proxy (Optional): While not mandatory, a proxy can help in certain situations to manage requests more effectively.
• Rust: Make sure Rust is installed on your system to compile and run the code.
• CapSolver API Key: Obtain an API key from CapSolver to interact with their service.

Step 1: Install Necessary Dependencies

To begin, ensure your Cargo.toml file includes the necessary dependencies. These libraries will help manage HTTP requests, handle JSON data, and support asynchronous operations in Rust:

[dependencies]
reqwest = { version = "0.11", features = ["json"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
tokio = { version = "1", features = ["full"] }

👨‍💻 Step 2: Rust Code for Solving reCaptcha v2 Without Proxy

Here's a detailed Rust program to solve reCaptcha v2. This code leverages asynchronous programming to efficiently handle network requests and responses.

use reqwest::Client;
use serde_json::json;
use std::error::Error;
use tokio::time::{sleep, Duration};

const PAGE_URL: &str = "YourWebsiteURL"; // Replace with your Website URL
const SITE_KEY: &str = "YourSiteKey"; // Replace with your Site Key
const CLIENT_KEY: &str = "YourCapsolverAPIKey"; // Replace with your CapSolver API Key

// Create a task using the CapSolver API
async fn create_task(payload: serde_json::Value) -> Result<serde_json::Value, Box<dyn Error>> {
    let client = Client::new();
    let res = client
        .post("https://api.capsolver.com/createTask")
        .json(&json!({
            "clientKey": CLIENT_KEY,
            "task": payload
        }))
        .send()
        .await?;

    let data = res.json::<serde_json::Value>().await?;
    Ok(data)
}

// Get the task result for the provided task ID
async fn get_task_result(task_id: &str) -> Result<serde_json::Value, Box<dyn Error>> {
    let client = Client::new();
    loop {
        sleep(Duration::from_secs(1)).await;
        println!("Getting task result for task ID: {}", task_id);

        let res = client
            .post("https://api.capsolver.com/getTaskResult")
            .json(&json!({
                "clientKey": CLIENT_KEY,
                "taskId": task_id
            }))
            .send()
            .await?;

        let data = res.json::<serde_json::Value>().await?;
        if data["status"] == "ready" {
            return Ok(data);
        }
    }
}

// Solves reCaptcha by creating a task and retrieving the result
async fn solve_recaptcha(page_url: &str, site_key: &str) -> Result<serde_json::Value, Box<dyn Error>> {
    let task_payload = json!({
        "type": "ReCaptchaV2TaskProxyless",
        "websiteURL": page_url,
        "websiteKey": site_key
    });

    let task_data = create_task(task_payload).await?;
    get_task_result(task_data["taskId"].as_str().unwrap()).await
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let response = solve_recaptcha(PAGE_URL, SITE_KEY).await?;
    
    if let Some(token) = response["solution"]["gRecaptchaResponse"].as_str() {
        println!("Received token: {}", token);
    } else {
        println!("Failed to retrieve token.");
    }

    Ok(())
}

Explanation

• create_task: This function sends a request to CapSolver to create a reCaptcha solving task. It sends the task payload as JSON and returns the response containing the task ID.

• get_task_result: This function continuously polls the CapSolver API every second to retrieve the result of the created task. It waits until the task is marked as "ready" and then returns the task solution.

• solve_recaptcha: This function integrates both the task creation and result retrieval processes to solve the reCaptcha.

• main: This function calls solve_recaptcha and prints out the reCaptcha response token once it is available.

👀 More Information

For more insights and advanced techniques, consider exploring the following resources:

• How to solve reCaptcha v3 and get a score 0.7-0.9 like a human
• Solve all types of reCaptcha v2 / v2 invisible / v2 enterprise / v3 / v3 enterprise
• Identify what reCaptcha is being used

By following these steps and ng the provided code, you can effectively automate the process of solving reCAPTCHA v2 challenges using Rust and CapSolver, enhancing your application's efficiency and user experience.