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const urlUtil = require('url')
const extension = require('extensionizer')
const resolveEnsToIpfsContentId = require('./resolver.js')
const supportedTopLevelDomains = ['eth']
module.exports = setupEnsIpfsResolver
function setupEnsIpfsResolver({ provider }) {
// install listener
const urlPatterns = supportedTopLevelDomains.map(tld => `*://*.${tld}/*`)
extension.webRequest.onErrorOccurred.addListener(webRequestDidFail, { urls: urlPatterns })
// return api object
return {
// uninstall listener
remove () {
extension.webRequest.onErrorOccurred.removeListener(webRequestDidFail)
},
}
async function webRequestDidFail (details) {
const { tabId, url } = details
// ignore requests that are not associated with tabs
if (tabId === -1) return
// parse ens name
const urlData = urlUtil.parse(url)
const { hostname: name, path, search } = urlData
const domainParts = name.split('.')
const topLevelDomain = domainParts[domainParts.length - 1]
// if unsupported TLD, abort
if (!supportedTopLevelDomains.includes(topLevelDomain)) return
// otherwise attempt resolve
attemptResolve({ tabId, name, path, search })
}
async function attemptResolve({ tabId, name, path, search }) {
extension.tabs.update(tabId, { url: `loading.html` })
try {
const ipfsContentId = await resolveEnsToIpfsContentId({ provider, name })
let url = `https://gateway.ipfs.io/ipfs/${ipfsContentId}${path}${search || ''}`
try {
// check if ipfs gateway has result
const response = await fetch(url, { method: 'HEAD' })
// if failure, redirect to 404 page
if (response.status !== 200) {
extension.tabs.update(tabId, { url: '404.html' })
return
}
// otherwise redirect to the correct page
extension.tabs.update(tabId, { url })
} catch (err) {
console.warn(err)
// if HEAD fetch failed, redirect so user can see relevant error page
extension.tabs.update(tabId, { url })
}
} catch (err) {
console.warn(err)
extension.tabs.update(tabId, { url: `error.html?name=${name}` })
}
}
}
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