// Forked from https://github.com/ipfs/ipfs-service-worker which does not work with recent versions
// of js-ipfs.
/* global self, Response */
'use strict'
const IPFS = require('ipfs')
let node
// https://redfin.engineering/how-to-fix-the-refresh-button-when-using-service-workers-a8e27af6df68
self.skipWaiting()
self.addEventListener('install', (event) => {
console.log('install step')
event.waitUntil(self.skipWaiting())
})
self.addEventListener('activate', (event) => {
console.log('activate step')
event.waitUntil(self.clients.claim())
})
function initialize_ipfs() {
return new Promise((resolve, reject) => {
node = new IPFS()
node.on('ready', () => {
console.log('js-ipfs node is ready')
resolve()
})
node.on('error', (err) => {
console.log('js-ipfs node errored', err)
reject(err)
})
})
}
let ipfs_initialized
function response(status_code, status_text, body, headers={}) {
// Return a promise for a response with the given HTTP status code, status text, and HTML body.
return new Promise((resolve, reject) => {
resolve(
new Response(
body,
{
status: status_code,
statusText: status_text,
headers: headers
}
)
)
})
}
self.addEventListener('fetch', (event) => {
if (!event.request.url.startsWith(self.location.origin + '/ipfs')) {
return console.log('Fetch not in scope:', event.request.url)
}
console.log('Handling fetch event:', event.request.url)
if (!ipfs_initialized) {
ipfs_initialized = initialize_ipfs()
}
event.respondWith(
ipfs_initialized.then(() => {
const url = new URL(event.request.url)
const multihash = url.pathname
return node.files.cat(multihash)
}).then((contents_buffer) => {
return response(200, 'OK', contents_buffer)
}).catch((error) => {
console.log(error)
return response(
404, 'Not Found',
Buffer.from('404 Not Found404 Not Found
Intergalactic'),
{'Content-Type': 'text/html; charset=utf-8'}
)
})
)
})