Check if the URL has been accessed before and signaling to the user
Per
// ==UserScript==
// @name Chan SankakuComplex URL Verifier with IndexedDB
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Check if the URL has been accessed before and signaling to the user
// @author mtpontes
// @match *://chan.sankakucomplex.com/*
// @match *://idol.sankakucomplex.com/*
// @match *://legacy.sankakucomplex.com/*
// @grant none
// @icon data:image/png;base64,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
// @grant none
// @license MI
// ==/UserScript==
(function() {
console.log('Starting execution of the visited URLs persister...');
const dbName = 'VisitedDB';
function getDatabaseConnection() {
return new Promise((resolve, reject) => {
const request = indexedDB.open(dbName, 1);
// If the database structure needs to be created or updated
request.onupgradeneeded = (event) => {
const db = event.target.result;
if (!db.objectStoreNames.contains('visitedURLs')) {
db.createObjectStore('visitedURLs', { keyPath: 'url' });
}
};
request.onsuccess = (event) => resolve(event.target.result); // Returns the database as the result of the Promise
request.onerror = (event) => reject('Error opening the database');
});
}
function initiateDbReadTransaction(db) {
const transaction = db.transaction(['visitedURLs'], 'readonly');
return transaction.objectStore('visitedURLs');
}
function initiateDbWriteTransaction(db) {
const transaction = db.transaction(['visitedURLs'], 'readwrite');
return transaction.objectStore('visitedURLs');
}
async function checkVisitedPage(db, url) {
const store = initiateDbReadTransaction(db);
const getRequest = store.get(url);
return new Promise((resolve, reject) => {
getRequest.onsuccess = () => resolve(!!getRequest.result); // Operation succeeded
getRequest.onerror = () => reject('Error accessing the database'); // Runs if the operation above fails
});
}
async function addCurrentPage(db, url) {
const store = initiateDbWriteTransaction(db);
return new Promise((resolve, reject) => {
const request = store.add({ url });
request.onsuccess = () => resolve(); // If successful, resolve without any value
request.onerror = () => reject('Error adding the URL to the database'); // Runs if the operation above fails
});
}
function addWarning() {
const warningDiv = document.createElement('div');
warningDiv.style.position = 'fixed';
warningDiv.style.top = '10px';
warningDiv.style.left = '10px';
warningDiv.style.backgroundColor = 'rgba(255, 0, 0, 0.8)';
warningDiv.style.color = 'white';
warningDiv.style.padding = '10px';
warningDiv.style.zIndex = '9999';
warningDiv.innerText = 'You have already visited this page!';
document.body.appendChild(warningDiv);
console.log('Visited URL warning was added');
}
async function run() {
try {
const currentUrl = window.location.href;
const db = await getDatabaseConnection();
const isVisited = await checkVisitedPage(db, currentUrl);
if (isVisited) {
console.log('URL already visited');
addWarning();
return;
}
await addCurrentPage(db, currentUrl);
console.log('URL added to the database');
} catch (error) {
console.error('Error:', error);
}
}
run();
})();