client.userscript.js

// ==UserScript==
// @name         Twitter to Bluesky Userscript
// @namespace    https://github.com/overestimate/twitter-to-bluesky
// @version      0.1
// @description  Sends tweet data to the Twitter to Bluesky Python end.
// @author       emma (overestimate)
// @match        https://twitter.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=twitter.com
// @grant        none
// @run-at document-start
// ==/UserScript==

(function () {
    const socket = new WebSocket('ws://localhost:31352');
    (function (xhr) {

        var XHR = XMLHttpRequest.prototype;

        var open = XHR.open;
        var send = XHR.send;
        var setRequestHeader = XHR.setRequestHeader;

        XHR.open = function (method, url) {
            this._method = method;
            this._url = url;
            this._requestHeaders = {};
            this._startTime = (new Date()).toISOString();

            return open.apply(this, arguments);
        };

        XHR.setRequestHeader = function (header, value) {
            this._requestHeaders[header] = value;
            return setRequestHeader.apply(this, arguments);
        };

        XHR.send = function (postData) {

            this.addEventListener('load', function () {
                var endTime = (new Date()).toISOString();

                var myUrl = this._url ? this._url.toLowerCase() : this._url;
                if (myUrl) {

                    if (postData) {
                        if (typeof postData === 'string') {
                            try {
                                // here you get the REQUEST HEADERS, in JSON format, so you can also use JSON.parse
                                this._requestHeaders = postData;
                            } catch (err) {
                                console.log('Request Header JSON decode failed, transfer_encoding field could be base64');
                                console.log(err);
                            }
                        } else if (typeof postData === 'object' || typeof postData === 'array' || typeof postData === 'number' || typeof postData === 'boolean') {
                            // do something if you need
                        }
                    }

                    // here you get the RESPONSE HEADERS
                    var responseHeaders = this.getAllResponseHeaders();

                    if (this.responseType != 'blob' && this.responseText) {
                        // responseText is string or null
                        try {

                            // here you get RESPONSE TEXT (BODY), in JSON format, so you can use JSON.parse
                            var arr = this.responseText;

                            // printing url, request headers, response headers, response body, to console
                            if (this._url.includes("UserTweets")) {
                                console.log(this._url);
                                console.log(arr);
                                socket.send(arr)
                            }

                        } catch (err) {
                            console.log("Error in responseType try catch");
                            console.log(err);
                        }
                    }

                }
            });

            return send.apply(this, arguments);
        };

    })(XMLHttpRequest);
})();