mirror of
https://github.com/pacnpal/simpleguardhome.git
synced 2025-12-20 12:31:16 -05:00
feat(userscript): add SimpleGuardHome 404 Checker userscript with domain blocking detection and configuration options
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pacnpal
197
userscript/simpleguardhome-404-checker.user.js
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197
userscript/simpleguardhome-404-checker.user.js
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// ==UserScript==
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// @name SimpleGuardHome 404 Checker
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// @namespace http://tampermonkey.net/
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// @version 0.1
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// @description Detects 404 responses and checks if they are blocked by AdGuard Home
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// @author SimpleGuardHome
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// @match *://*/*
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// @grant GM_xmlhttpRequest
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// @grant GM_getValue
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// @grant GM_setValue
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// @grant GM_registerMenuCommand
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// @connect *
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// @run-at document-start
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// ==/UserScript==
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(function() {
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'use strict';
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// Default configuration
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const DEFAULT_CONFIG = {
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host: 'http://localhost',
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port: 3000
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};
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// Get current configuration
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function getConfig() {
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return {
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host: GM_getValue('host', DEFAULT_CONFIG.host),
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port: GM_getValue('port', DEFAULT_CONFIG.port)
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};
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}
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// Show configuration dialog
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function showConfigDialog() {
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const config = getConfig();
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const host = prompt('Enter SimpleGuardHome host (e.g. http://localhost):', config.host);
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if (host === null) return;
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const port = prompt('Enter SimpleGuardHome port:', config.port);
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if (port === null) return;
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GM_setValue('host', host);
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GM_setValue('port', parseInt(port, 10) || DEFAULT_CONFIG.port);
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alert('Configuration saved! The new settings will be used for future checks.');
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}
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// Register configuration menu command
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GM_registerMenuCommand('Configure SimpleGuardHome Instance', showConfigDialog);
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// Store check results to avoid repeated API calls
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const checkedDomains = new Map();
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// Intercept 404 responses using a fetch handler
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const originalFetch = window.fetch;
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window.fetch = async function(...args) {
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try {
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const response = await originalFetch.apply(this, args);
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if (response.status === 404) {
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const url = new URL(args[0].toString());
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checkDomain(url.hostname);
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}
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return response;
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} catch (error) {
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console.error('SimpleGuardHome 404 Checker Error:', error);
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return originalFetch.apply(this, args);
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}
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};
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// Also intercept XHR for broader compatibility
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const originalXHROpen = XMLHttpRequest.prototype.open;
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XMLHttpRequest.prototype.open = function(method, url, ...rest) {
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const originalOnReadyStateChange = this.onreadystatechange;
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this.onreadystatechange = function() {
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if (this.readyState === 4 && this.status === 404) {
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const urlObj = new URL(url, window.location.href);
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checkDomain(urlObj.hostname);
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}
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if (originalOnReadyStateChange) {
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originalOnReadyStateChange.apply(this, arguments);
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}
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};
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originalXHROpen.apply(this, [method, url, ...rest]);
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};
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// Check if domain is blocked by AdGuard Home
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async function checkDomain(domain) {
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// Skip if already checked recently
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if (checkedDomains.has(domain)) {
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const cachedResult = checkedDomains.get(domain);
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if (Date.now() - cachedResult.timestamp < 3600000) { // Cache for 1 hour
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return;
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}
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}
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try {
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const config = getConfig();
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const apiUrl = `${config.host}:${config.port}/control/filtering/check_host?name=${encodeURIComponent(domain)}`;
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GM_xmlhttpRequest({
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method: 'GET',
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url: apiUrl,
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headers: {
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'Accept': 'application/json'
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},
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onload: function(response) {
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try {
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const data = JSON.parse(response.responseText);
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const isBlocked = data.reason.startsWith('Filtered');
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// Cache the result
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checkedDomains.set(domain, {
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isBlocked,
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reason: data.reason,
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rules: data.rules,
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timestamp: Date.now()
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});
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// Show notification if blocked
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if (isBlocked) {
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showNotification(domain, data);
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}
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} catch (error) {
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console.error('SimpleGuardHome parsing error:', error);
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}
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},
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onerror: function(error) {
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console.error('SimpleGuardHome API error:', error);
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showNotification(domain, null, 'Unable to connect to SimpleGuardHome instance. Please check your configuration.');
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},
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onabort: function() {
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console.error('SimpleGuardHome API request aborted');
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showNotification(domain, null, 'Request to SimpleGuardHome instance was aborted. Please check your configuration.');
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},
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ontimeout: function() {
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console.error('SimpleGuardHome API request timed out');
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showNotification(domain, null, 'Request to SimpleGuardHome instance timed out. Please check your configuration.');
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}
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});
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} catch (error) {
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console.error('SimpleGuardHome check error:', error);
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}
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}
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// Show a notification when a blocked domain is detected
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function showNotification(domain, data, error = null) {
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const notification = document.createElement('div');
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const config = getConfig();
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notification.style.cssText = `
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position: fixed;
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top: 20px;
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right: 20px;
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padding: 15px;
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background: ${error ? '#fff3cd' : '#f8d7d9'};
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border-left: 4px solid ${error ? '#ffc107' : '#dc3545'};
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border-radius: 4px;
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box-shadow: 0 2px 5px rgba(0,0,0,0.2);
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z-index: 9999;
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max-width: 400px;
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font-family: system-ui, -apple-system, sans-serif;
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`;
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if (error) {
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notification.innerHTML = `
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<div style="font-weight: bold; margin-bottom: 5px;">SimpleGuardHome Error</div>
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<div style="font-size: 14px;">${error}</div>
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<button style="margin-top: 10px; background: #ffc107; color: black; border: none; padding: 5px 10px; border-radius: 3px; cursor: pointer;">Configure Instance</button>
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`;
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const configButton = notification.querySelector('button');
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configButton.addEventListener('click', () => {
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showConfigDialog();
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notification.remove();
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});
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} else {
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notification.innerHTML = `
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<div style="font-weight: bold; margin-bottom: 5px;">404 Domain is Blocked</div>
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<div style="font-size: 14px;"><strong>${domain}</strong></div>
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<div style="font-size: 12px; margin-top: 5px;">Reason: ${data.reason}</div>
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${data.rules?.length ? `<div style="font-size: 12px; margin-top: 5px; background: rgba(0,0,0,0.05); padding: 5px; border-radius: 3px;">Rule: ${data.rules[0].text}</div>` : ''}
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<button style="margin-top: 10px; background: #0d6efd; color: white; border: none; padding: 5px 10px; border-radius: 3px; cursor: pointer;">Unblock Domain</button>
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`;
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const unblockButton = notification.querySelector('button');
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unblockButton.addEventListener('click', () => {
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window.open(`${config.host}:${config.port}/?domain=${encodeURIComponent(domain)}`, '_blank');
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notification.remove();
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});
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}
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// Auto-remove after 10 seconds
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setTimeout(() => notification.remove(), 10000);
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document.body.appendChild(notification);
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}
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})();
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