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const uptimerobot_id = 'your uptimerobot_id'
const upstream = 'stats.uptimerobot.com'
const upstream_path = '/' + uptimerobot_id
const replace_dict = {
'$upstream': '$custom_domain',
// default 10s
'counter.innerText = "59";': 'counter.innerText = "10";',
[uptimerobot_id]: '-h-',
}
addEventListener('fetch', event => {
event.respondWith(fetchAndApply(event.request));
})
async function fetchAndApply(request) {
const region = request.headers.get('cf-ipcountry').toUpperCase();
const ip_address = request.headers.get('cf-connecting-ip');
let response = null;
let url = new URL(request.url);
let url_hostname = url.hostname;
url.protocol = 'https:';
let upstream_domain = upstream
url.host = upstream_domain;
if (url.pathname == '/') {
url.pathname = upstream_path
} else if (!isNaN(parseInt(url.pathname.split('/')[1]))) {
url.pathname = upstream_path + url.pathname;
} else {
}
url.pathname = url.pathname.replace('-h-',uptimerobot_id)
let method = request.method;
let request_headers = request.headers;
let new_request_headers = new Headers(request_headers);
new_request_headers.set('Host', upstream_domain);
new_request_headers.set('Referer', url.protocol + '//' + url_hostname);
let original_response = await fetch(url.href, {
method: method,
headers: new_request_headers
})
let original_response_clone = original_response.clone();
let original_text = null;
let response_headers = original_response.headers;
let new_response_headers = new Headers(response_headers);
let status = original_response.status;
// new_response_headers.delete('access-control-allow-origin', '*');
// new_response_headers.delete('access-control-allow-credentials', true);
new_response_headers.delete('content-security-policy');
new_response_headers.delete('content-security-policy-report-only');
new_response_headers.delete('clear-site-data');
const content_type = new_response_headers.get('content-type');
if (content_type != null && content_type.includes('text/html') && content_type.includes('UTF-8')) {
original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname);
} else {
original_text = original_response_clone.body
}
response = new Response(original_text, {
status,
headers: new_response_headers
})
return response;
}
async function replace_response_text(response, upstream_domain, host_name) {
let text = await response.text()
var i, j;
for (i in replace_dict) {
j = replace_dict[i]
if (i == '$upstream') {
i = upstream_domain
} else if (i == '$custom_domain') {
i = host_name
}
if (j == '$upstream') {
j = upstream_domain
} else if (j == '$custom_domain') {
j = host_name
}
let re = new RegExp(i, 'g')
text = text.replace(re, j);
}
// remove tracker
return text.replace(text.substr(text.indexOf('var _rollbarConfig')).split('</head>')[0], '</script>').replaceAll('/-h-"','"')
}
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