metasearch/index.js

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JavaScript
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const storageType = 'localStorage'
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let data = {}
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const infoEl = document.getElementById('info')
const formEl = document.getElementById('search')
const errors = {
missingQuery: new TypeError('Query is missing.'),
noFoundInstances: new TypeError('No instances were found.'),
}
function buildSearchURL (opts = {}) {
if (typeof opts.query !== 'string') throw errors.missingQuery
if (!('instances' in data)) throw errors.noFoundInstances
if (data.instances.length === 0) throw errors.noFoundInstances
// Random instance
const n = Math.floor(Math.random() * data.instances.length)
const instanceURL = data.instances[n]
// Build URL
const params = new URLSearchParams({
q: opts.query
})
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if (opts.category && opts.category !== 'all') {
params.append(`category_${opts.category}`, '')
}
const url = `${instanceURL}?${params.toString()}`
return url
}
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// Register event listeners
formEl.addEventListener('submit', (event) => {
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event.preventDefault()
location.assign(buildSearchURL({
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query: formEl.query.value,
category: formEl.category.value
}))
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})
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function locallyGetInstances () {
if (!(storageType in window)) return []
const item = window[storageType].getItem('instances')
try {
return JSON.parse(item)
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} catch (_err) {
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return []
}
}
function locallySetInstances () {
if (!(storageType in window)) return
if (!('instances' in data)) return
if (data.instances.length === 0) return
window[storageType].setItem(
'instances',
JSON.stringify(data.instances)
)
}
async function remotelyGetInstances () {
const instances = await fetch('https://searx.space/data/instances.json')
.then((req) => req.json())
.then((json) => Object.entries(json.instances))
.then((entries) => entries.filter(([_url, details]) => {
if (details.network_type !== 'normal') return
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if (details.uptime == null) return
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if (details.uptime.uptimeDay !== 100) return
return true
}))
.then((entries) => entries.map(([url]) => url))
.catch((err) => {
console.error(err)
return []
})
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window[storageType].setItem('timestamp', Date.now().toString())
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return instances
}
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// Get local instances
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data.instances = locallyGetInstances()
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// Fetch remote instances if necessary
const timestamp = +window[storageType].getItem('timestamp')
if (Date.now() > timestamp + 3_600_000 /* 1 hour */) {
const remoteInstances = await remotelyGetInstances()
if (remoteInstances.length > 0) {
data.instances = remoteInstances
locallySetInstances()
}
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}
// Auto-redirect in presence of search parameters
if (location.search.length > 0) {
const searchParams = new URLSearchParams(location.search.slice(1))
if (searchParams.has('q')) {
location.assign(buildSearchURL({
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query: searchParams.get('q'),
category: searchParams.get('in') ?? 'all'
}))
}
}
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infoEl.textContent = `${data.instances.length} instances`
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if (data.instances.length > 0) {
infoEl.classList.add('error')
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}