1 files changed, 61 insertions, 0 deletions
diff --git a/swayback/templates/sw.js b/swayback/templates/sw.js
new file mode 100644
index 0000000..ea653a9
--- /dev/null
+++ b/swayback/templates/sw.js
@@ -0,0 +1,61 @@
+/* script config, dynamically generated */
+const baseHost = "{{ baseHost }}";
+const baseDomain = baseHost.split (':', 1)[0];
+
+self.addEventListener('install', function(event) {
+	console.log ('installed service worker', event);
+	self.skipWaiting();
+});
+/* load stuff through service worker immediately? XXX: only debugging? */
+self.addEventListener('activate', async function() {
+    if (self.registration.navigationPreload) {
+      // Enable navigation preloads!
+      await self.registration.navigationPreload.enable();
+    } /*event => {
+  event.waitUntil(clients.claim());*/
+});
+
+self.addEventListener('fetch', function(event) {
+	let origreq = event.request;
+	console.log ('fetch event', origreq.url, event);
+	let url = new URL (origreq.url);
+	url.protocol = 'https:';
+	url.port = 443;
+	url.hash = '';
+	if (url.hostname.endsWith ('.' + baseDomain)) {
+		url.hostname = url.hostname.slice (0, url.hostname.length-('.'+baseDomain).length);
+	}
+	console.log ('orig url', url);
+	/* should contain everything we cannot use in the actual request (i.e. url and method) */
+	let body = {
+		'url': url.href,
+		'method': origreq.method,
+		};
+	let headers = {
+		'Content-Type': 'application/json',
+		};
+	/* add a few well-known request headers */
+	let origheaders = origreq.headers;
+	if (origheaders.has ('accept')) {
+		headers['Accept'] = origreq.headers.get ('accept');
+	}
+	console.log ('sending', body, headers);
+	let req = new Request ('http://' + baseHost + '/raw',
+			{method: 'POST', body: JSON.stringify (body), headers: headers,
+			mode: 'cors'});
+
+	event.respondWith (
+		fetch(req)
+		.then(function (response) {
+			// response may be used only once
+			// we need to save clone to put one copy in cache
+			// and serve second one
+			let responseClone = response.clone();
+			console.log ('got resp', responseClone);
+			return response;
+		})
+		.catch (function () {
+			console.log ('nope');
+		})
+	);
+});