Automatically download PDFs from network and extract filename from response headers on the Hitit Unviersity homework pop-up.

hitit_ubys_homework_fix.user.js

// ==UserScript==
// @name         Hitit University UBYS Firefox Homework Download Fix
// @namespace    mailto:ahmetardakavakci@gmail.com
// @version      1.2
// @description  Automatically download PDFs from network and extract filename from response headers on the Hitit Unviersity homework pop-up.
// @author       Ahmet Arda Kavakcı
// @match        *://ubys.hitit.edu.tr/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Hook into XMLHttpRequest to detect POST requests
    (function(open) {
        XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
            this.addEventListener('load', function() {
                // Check if the URL contains "DownloadHomeworkFile"
                if (url.includes('DownloadHomeworkFile')) {
                    // Extract filename from response headers
                    let filename = 'default.pdf'; // Fallback filename
                    const disposition = this.getResponseHeader('Content-Disposition');
                    if (disposition && disposition.includes('filename=')) {
                        const matches = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/.exec(disposition);
                        if (matches != null && matches[1]) {
                            filename = matches[1].replace(/['"]/g, ''); // Clean quotes
                        }
                    }

                    // Create a blob from the response
                    const blob = new Blob([this.response], { type: 'application/pdf' });
                    const link = document.createElement('a');
                    const urlBlob = window.URL.createObjectURL(blob);
                    link.href = urlBlob;
                    link.download = filename; // Use extracted filename
                    document.body.appendChild(link);
                    link.click();
                    document.body.removeChild(link);
                    window.URL.revokeObjectURL(urlBlob);
                }
            });

            // Call the original open method
            open.call(this, method, url, async, user, pass);
        };
    })(XMLHttpRequest.prototype.open);

    // Hook into Fetch API for modern requests
    const originalFetch = window.fetch;
    window.fetch = async function(...args) {
        const response = await originalFetch(...args);

        // Check if the request URL contains 'DownloadHomeworkFile'
        if (args[0].includes('DownloadHomeworkFile')) {
            const contentDisposition = response.headers.get('Content-Disposition');
            let filename = 'default.pdf'; // Fallback filename

            // Extract filename from Content-Disposition header
            if (contentDisposition && contentDisposition.includes('filename=')) {
                const matches = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/.exec(contentDisposition);
                if (matches != null && matches[1]) {
                    filename = matches[1].replace(/['"]/g, ''); // Clean quotes
                }
            }

            response.clone().blob().then(function(blob) {
                const url = window.URL.createObjectURL(blob);
                const link = document.createElement('a');
                link.href = url;
                link.download = filename; // Use extracted filename
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                window.URL.revokeObjectURL(url);
            });
        }

        return response;
    };
})();