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importScripts('/common/get-host-info.sub.js');
importScripts('test-helpers.sub.js');
const HOST_INFO = get_host_info();
const REMOTE_ORIGIN = HOST_INFO.HTTPS_REMOTE_ORIGIN;
const BASE_PATH = base_path();
const CSS_FILE = 'fetch-request-css-cross-origin-mime-check-cross.css';
const HTML_FILE = 'fetch-request-css-cross-origin-mime-check-cross.html';
function add_pipe_header(url_str, header) {
if (url_str.indexOf('?pipe=') == -1) {
url_str += '?pipe=';
} else {
url_str += '|';
}
url_str += `header${header}`;
return url_str;
}
self.addEventListener('fetch', function(event) {
const url = new URL(event.request.url);
const use_mime =
(url.searchParams.get('mime') != 'no');
const mime_header = '(Content-Type, text/css)';
const use_cors =
(url.searchParams.has('cors'));
const cors_header = '(Access-Control-Allow-Origin, *)';
const file = url.pathname.substring(url.pathname.lastIndexOf('/') + 1);
// Respond with a cross-origin CSS resource, using CORS if desired.
if (file == 'cross-origin-css.css') {
let fetch_url = REMOTE_ORIGIN + BASE_PATH + CSS_FILE;
if (use_mime)
fetch_url = add_pipe_header(fetch_url, mime_header);
if (use_cors)
fetch_url = add_pipe_header(fetch_url, cors_header);
const mode = use_cors ? 'cors' : 'no-cors';
event.respondWith(fetch(fetch_url, {'mode': mode}));
return;
}
// Respond with a cross-origin CSS resource with an HTML name. This is only
// used in the MIME sniffing test, so MIME is never added.
if (file == 'cross-origin-html.css') {
const fetch_url = REMOTE_ORIGIN + BASE_PATH + HTML_FILE;
event.respondWith(fetch(fetch_url, {mode: 'no-cors'}));
return;
}
// Respond with synthetic CSS.
if (file == 'synthetic.css') {
let headers = {};
if (use_mime) {
headers['Content-Type'] = 'text/css';
}
event.respondWith(new Response("#synthetic { color: blue; }", {headers}));
return;
}
// Otherwise, fallback to network.
});
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