Detect and send message to your program on Duolingo challenge completed

README.md

• open chrome://extensions/ and turn on "Developer Mode" on the top right
• install tampermonkey: https://chromewebstore.google.com/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo
• click on the extension, then click "create a new script"
• in the editor, copy the userscript.js file contents
• install python, flask, and run server.py

server.py

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/data', methods=['POST'])
def receive_data():
    # Get the JSON data sent from Tampermonkey
    data = request.get_json()
    print(f"Received data: {data}")
    
    # Do something with the data, e.g., save it, process it, etc.

    # Return a response back to Tampermonkey
    return jsonify({"message": "Data received successfully", "received": data})

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)

userscript.js

// ==UserScript==
// @name         Duolingo Lesson Completion Detection
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Detect Duolingo lesson completion by intercepting requests and checking body content
// @author       Daniel Guenther
// @match        https://www.duolingo.com/learn
// @grant        GM_xmlhttpRequest
// @connect      localhost
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    console.log('lesson completed detector running...');

    // Save the original XMLHttpRequest open and send methods
    const originalXhrOpen = window.XMLHttpRequest.prototype.open;
    const originalXhrSend = window.XMLHttpRequest.prototype.send;

    // Override the open method to inspect request details
    window.XMLHttpRequest.prototype.open = function(method, url) {
        this._url = url; // Save the request URL for later use
        originalXhrOpen.apply(this, arguments); // Call the original open method
    };

    // Override the send method to inspect the request body
    window.XMLHttpRequest.prototype.send = function(body) {
        if (this._url.includes('https://excess.duolingo.com/challenge_response/batch')) { // Check if this is the challenge response request
            console.log("Intercepted XHR request to Duolingo challenge_response API!");

            // Parse the request body (assuming it's JSON format)
            const requestBody = JSON.parse(body);

            // Check for the conditions `correct: true` and `skipped: false`
            const challengeCompleted = requestBody.some(entry => entry.correct === true && entry.skipped === false);

            if (challengeCompleted) {
                console.log("Duolingo challenge completed successfully! Sending signal to server...");
                sendChallengeCompleted();
            }
        }

        // Call the original send method
        originalXhrSend.apply(this, arguments);
    };

    // Function to send data to the server when a lesson is completed
    function sendChallengeCompleted() {
        GM_xmlhttpRequest({
            method: "POST",
            url: "http://localhost:5000/data", // Your server endpoint
            data: JSON.stringify({
                message: "Challeneg completed!",
                timestamp: new Date().toISOString()
            }),
            headers: {
                "Content-Type": "application/json"
            },
            onload: function(response) {
                console.log("Response from server:", response.responseText);
            },
            onerror: function(error) {
                console.error("Error:", error);
            }
        });
    }

})();

Partly generated with chatGPT, tested locally on 2024-10-18