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index.js
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index.js
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'use strict'
const {
chain,
eq,
flow,
get,
includes,
invoke,
isArray,
isEmpty,
isNumber,
isBoolean,
isString,
isDate,
lte,
replace,
size,
toLower,
toString
} = require('lodash')
const memoizeOne = require('memoize-one').default || require('memoize-one')
const urlRegex = require('url-regex-safe')({ exact: true, parens: true })
const condenseWhitespace = require('condense-whitespace')
const capitalize = require('microsoft-capitalize')
const { JSDOM, VirtualConsole } = require('jsdom')
const isRelativeUrl = require('is-relative-url')
const fileExtension = require('file-extension')
const _normalizeUrl = require('normalize-url')
const smartquotes = require('smartquotes')
const { decodeHTML } = require('entities')
const iso6393 = require('iso-639-3/to-1')
const mimeTypes = require('mime-types')
const hasValues = require('has-values')
const chrono = require('chrono-node')
const truncate = require('truncate')
const isIso = require('isostring')
const isUri = require('is-uri')
const { URL } = require('url')
const iso6393Values = Object.values(iso6393)
const toTitle = str =>
capitalize(str, [
'CLI',
'API',
'HTTP',
'HTTPS',
'JSX',
'DNS',
'URL',
'CI',
'CDN',
'package.json',
'GitHub',
'GitLab',
'CSS',
'JS',
'JavaScript',
'TypeScript',
'HTML',
'WordPress',
'JavaScript',
'Node.js'
])
const VIDEO = 'video'
const AUDIO = 'audio'
const IMAGE = 'image'
const imageExtensions = chain(require('image-extensions'))
.reduce((acc, ext) => ({ ...acc, [ext]: IMAGE }), {})
.value()
const audioExtensions = chain(require('audio-extensions'))
.concat(['mpga'])
.difference(['mp4'])
.reduce((acc, ext) => ({ ...acc, [ext]: AUDIO }), {})
.value()
const videoExtensions = chain(require('video-extensions'))
.reduce((acc, ext) => ({ ...acc, [ext]: VIDEO }), {})
.value()
const EXTENSIONS = {
...imageExtensions,
...audioExtensions,
...videoExtensions
}
const REGEX_BY = /^[\s\n]*by[\s\n]+|@[\s\n]*/i
const REGEX_LOCATION = /^[A-Z\s]+\s+[-—–]\s+/
const REGEX_TITLE_SEPARATOR = /^[^|\-/•—]+/
const TRUNCATE_MAX_LENGTH = 300
const AUTHOR_MAX_LENGTH = 128
const removeLocation = value => replace(value, REGEX_LOCATION, '')
const isUrl = (url, { relative = false } = {}) =>
relative ? isRelativeUrl(url) : urlRegex.test(url)
const urlObject = (...args) => {
try {
return new URL(...args)
} catch (_) {
return { toString: () => '' }
}
}
const absoluteUrl = (baseUrl, relativePath) => {
if (isEmpty(relativePath)) return urlObject(baseUrl).toString()
return urlObject(relativePath, baseUrl).toString()
}
const sanetizeUrl = (url, opts) =>
_normalizeUrl(url, {
stripWWW: false,
sortQueryParameters: false,
removeTrailingSlash: false,
...opts
})
const normalizeUrl = (baseUrl, relativePath, opts) => {
try {
return sanetizeUrl(absoluteUrl(baseUrl, relativePath), opts)
} catch (_) {}
}
const removeBy = flow([
value => value.replace(REGEX_BY, ''),
condenseWhitespace
])
const removeSeparator = title =>
condenseWhitespace((REGEX_TITLE_SEPARATOR.exec(title) || [])[0] || title)
const createTitle = flow([condenseWhitespace, smartquotes])
const titleize = (src, opts = {}) => {
let title = createTitle(src)
if (opts.removeBy) title = removeBy(title)
if (opts.removeSeparator) title = removeSeparator(title)
if (opts.capitalize) title = toTitle(title)
return title
}
const $filter = ($, domNodes, fn = $filter.fn) => {
const el = domNodes.filter((i, el) => fn($(el))).first()
return fn(el)
}
$filter.fn = el => condenseWhitespace(el.text())
const isAuthor = (str, opts = { relative: false }) =>
!isUrl(str, opts) &&
!isEmpty(str) &&
isString(str) &&
lte(size(str), AUTHOR_MAX_LENGTH)
const getAuthor = (str, { removeBy = true, ...opts } = {}) =>
titleize(str, { removeBy, ...opts })
const protocol = url => {
const { protocol = '' } = urlObject(url)
return protocol.replace(':', '')
}
const isMediaTypeUrl = (url, type, { ext, ...opts } = {}) =>
isUrl(url, opts) && isMediaTypeExtension(url, type, ext)
const isMediaTypeExtension = (url, type, ext) =>
eq(type, get(EXTENSIONS, ext || extension(url)))
const isMediaUrl = (url, opts) =>
isImageUrl(url, opts) || isVideoUrl(url, opts) || isAudioUrl(url, opts)
const isVideoUrl = (url, opts) => isMediaTypeUrl(url, VIDEO, opts)
const isAudioUrl = (url, opts) => isMediaTypeUrl(url, AUDIO, opts)
const isImageUrl = (url, opts) => isMediaTypeUrl(url, IMAGE, opts)
const isMediaExtension = url =>
isImageExtension(url) || isVideoExtension(url) || isAudioExtension(url)
const isVideoExtension = url => isMediaTypeExtension(url, VIDEO)
const isAudioExtension = url => isMediaTypeExtension(url, AUDIO)
const isImageExtension = url => isMediaTypeExtension(url, IMAGE)
const extension = (str = '') => {
const url = urlObject(
str,
isRelativeUrl(str) ? 'http://localhost' : undefined
)
url.hash = ''
url.search = ''
return fileExtension(url.toString())
}
const description = (value, opts) =>
isString(value) ? getDescription(value, opts) : undefined
const getDescription = (
str,
{ truncateLength = TRUNCATE_MAX_LENGTH, ...opts } = {}
) => {
const description = removeLocation(truncate(str, truncateLength))
return titleize(description, opts)
}
const publisher = value =>
isString(value) ? condenseWhitespace(value) : undefined
const author = (value, opts) =>
isAuthor(value) ? getAuthor(value, opts) : undefined
const url = (value, { url = '' } = {}) => {
if (isEmpty(value)) return undefined
try {
const absoluteUrl = normalizeUrl(url, value)
if (isUrl(absoluteUrl)) return absoluteUrl
} catch (_) {}
return isUri(value) ? value : undefined
}
const getISODate = date =>
date && !Number.isNaN(date.getTime()) ? date.toISOString() : undefined
const date = value => {
if (isDate(value)) return value.toISOString()
if (!(isString(value) || isNumber(value))) return undefined
// remove whitespace for easier parsing
if (isString(value)) value = condenseWhitespace(value)
// convert isodates to restringify, because sometimes they are truncated
if (isIso(value)) return new Date(value).toISOString()
if (/^\d{4}$/.test(value)) return new Date(toString(value)).toISOString()
let isoDate
if (isString(value)) {
for (const item of value.split('\n').filter(Boolean)) {
const parsed = chrono.parseDate(item)
isoDate = getISODate(parsed)
if (isoDate) break
}
} else {
if (value >= 1e16 || value <= -1e16) {
// nanoseconds
value = Math.floor(value / 1000000)
} else if (value >= 1e14 || value <= -1e14) {
// microseconds
value = Math.floor(value / 1000)
} else if (!(value >= 1e11) || value <= -3e10) {
// seconds
value = value * 1000
}
isoDate = getISODate(new Date(value))
}
return isoDate
}
const lang = input => {
if (isEmpty(input) || !isString(input)) return undefined
const key = toLower(condenseWhitespace(input))
if (input.length === 3) return iso6393[key]
const lang = toLower(key.substring(0, 2))
return includes(iso6393Values, lang) ? lang : undefined
}
const title = (value, { removeSeparator = false, ...opts } = {}) =>
isString(value) ? titleize(value, { removeSeparator, ...opts }) : undefined
const isMime = (contentType, type) => {
const ext = mimeTypes.extension(contentType)
return eq(type, get(EXTENSIONS, ext))
}
memoizeOne.EqualityUrlAndHtmlDom = (newArgs, oldArgs) =>
newArgs[0] === oldArgs[0] && newArgs[1].html() === oldArgs[1].html()
const jsonld = memoizeOne(
$ =>
$('script[type="application/ld+json"]')
.map((i, e) => {
try {
return JSON.parse(
$(e)
.contents()
.text()
)
} catch (_) {
return undefined
}
})
.get()
.filter(Boolean),
(newArgs, oldArgs) => newArgs[0].html() === oldArgs[0].html()
)
const $jsonld = propName => $ => {
const collection = jsonld($)
let value
collection.find(item => {
value = get(item, propName)
return !isEmpty(value) || isNumber(value) || isBoolean(value)
})
return isString(value) ? decodeHTML(value) : value
}
const image = (value, opts) => {
const urlValue = url(value, opts)
return !isAudioUrl(urlValue, opts) && !isVideoUrl(urlValue, opts)
? urlValue
: undefined
}
const logo = image
const video = (value, opts) => {
const urlValue = url(value, opts)
return isVideoUrl(urlValue, opts) ? urlValue : undefined
}
const audio = (value, opts) => {
const urlValue = url(value, opts)
return isAudioUrl(urlValue, opts) ? urlValue : undefined
}
const validator = {
audio,
author,
date,
description,
image,
lang,
logo,
publisher,
title,
url,
video
}
const truthyTest = () => true
const findRule = async (rules, args) => {
let index = 0
let value
do {
const rule = rules[index++]
const test = rule.test || truthyTest
if (test(args)) value = await rule(args)
} while (!has(value) && index < rules.length)
return value
}
const toRule = (mapper, opts) => rule => async ({ htmlDom, url }) => {
const value = await rule(htmlDom, url)
return mapper(value, { url, ...opts })
}
const composeRule = rule => ({ from, to = from, ...opts }) => async ({
htmlDom,
url
}) => {
const data = await rule(htmlDom, url)
const value = get(data, from)
return invoke(validator, to, value, { url, ...opts })
}
const has = value =>
value !== undefined && !Number.isNaN(value) && hasValues(value)
const domLoaded = dom =>
new Promise(resolve =>
dom.window.document.readyState === 'interactive' ||
dom.window.document.readyState === 'complete'
? resolve()
: dom.window.document.addEventListener('DOMContentLoaded', resolve)
)
const loadIframe = (url, html) =>
new Promise(resolve => {
const dom = new JSDOM(html, {
url,
virtualConsole: new VirtualConsole(),
runScripts: 'dangerously',
resources: 'usable'
})
const getIframe = () => dom.window.document.querySelector('iframe')
const load = iframe =>
iframe
? iframe.addEventListener('load', () => resolve(iframe.contentWindow))
: resolve()
const iframe = getIframe()
if (iframe) return load(iframe)
domLoaded(dom).then(() => load(getIframe()))
})
module.exports = {
$filter,
$jsonld,
absoluteUrl,
audio,
audioExtensions,
author,
composeRule,
date,
description,
extension,
findRule,
has,
image,
imageExtensions,
isArray,
isAudioExtension,
isAudioUrl,
isAuthor,
isImageExtension,
isImageUrl,
isMediaExtension,
isMediaUrl,
isMime,
isString,
isUrl,
isVideoExtension,
isVideoUrl,
jsonld,
lang,
loadIframe,
logo,
memoizeOne,
normalizeUrl,
protocol,
publisher,
sanetizeUrl,
title,
titleize,
toRule,
url,
validator,
video,
videoExtensions
}