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addEventListener("install", function (evt) {
evt.waitUntil(self.skipWaiting());
});
/**
* Given a multipart/form-data encoded string that we know to have only a single
* part, return the contents of the part. (MIME multipart encoding is too
* exciting to delve into.)
*/
function extractBlobFromMultipartFormData(text) {
const lines = text.split(/\r\n/g);
const firstBlank = lines.indexOf("");
const foo = lines.slice(firstBlank + 1, -2).join("\n");
return foo;
}
self.addEventListener("fetch", event => {
const url = new URL(event.request.url);
const mode = url.searchParams.get("mode");
if (mode === "synthetic") {
event.respondWith(
(async () => {
// This works even if there wasn't a body explicitly associated with the
// request. We just get a zero-length string in that case.
const requestBodyContents = await event.request.text();
const blobContents =
extractBlobFromMultipartFormData(requestBodyContents);
return new Response(
`<!DOCTYPE HTML><head><meta charset="utf-8"/></head><body>
<h1 id="url">${event.request.url}</h1>
<div id="source">ServiceWorker</div>
<div id="blob">${blobContents}</div>
</body>`,
{ headers: { "Content-Type": "text/html" } }
);
})()
);
} else if (mode === "fetch") {
event.respondWith(fetch(event.request));
} else if (mode === "clone") {
// In order for the act of cloning to be interesting, we want the original
// request to remain alive so that any pipes end up having to buffer.
self.originalRequest = event.request;
event.respondWith(fetch(event.request.clone()));
} else {
event.respondWith(
new Response(
`<!DOCTYPE HTML><head><meta charset="utf-8"/></head><body>
<h1 id="error">Bad mode: ${mode}</h1>
<div id="source">ServiceWorker::Error</div>
<div id="blob">No, this is an error.</div>
</body>`,
{ headers: { "Content-Type": "text/html" }, status: 400 }
)
);
}
});