Created
May 1, 2017 03:28
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OGP with cheerio on Node.js (Sample)
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| const fetch = require('node-fetch'); | |
| const cheerio = require('cheerio'); | |
| urls = [] | |
| urls.push('http://qiita.com/horike37/items/b295a91908fcfd4033a2') | |
| urls.push('http://qiita.com/ryo0301/items/7f9fd8024987526cbc30') | |
| urls.push('http://inokara.hateblo.jp/entry/2017/04/30/092304') | |
| urls.push('https://togetter.com/li/1105672') | |
| urls.push('https://allabout.co.jp/gm/gc/469010/') | |
| urls.push('http://anond.hatelabo.jp/20170429110724') | |
| urls.push('http://internet.watch.impress.co.jp/docs/news/1055983.html') | |
| urls.push('http://qiita.com/chanibarin/items/48d5f5946b1e6c97e379') | |
| urls.push('http://gigazine.net/news/20170410-pix-dt350n/') | |
| urls.push('http://www.coconoodollblog.net/entry/2017/04/17/%E3%80%8C%E3%81%A7%E3%81%8D%E3%81%9F%EF%BC%81_%E3%83%AD%E3%83%95%E3%83%88%E3%82%92%E4%BD%9C%E3%82%8A%E3%81%BE%E3%81%97%E3%81%9F%E3%80%82%E2%91%A1%E3%80%8D%E6%97%A5%E6%9B%9C%E5%A4%A7%E5%B7%A5%E5%A5%B3') | |
| urls.push('http://www.dtmstation.com/archives/51994323.html') | |
| urls.push('http://www.itmedia.co.jp/news/articles/1704/07/news058.html') | |
| urls.forEach((url) => { | |
| const info = getPageInfo(url) | |
| info.then(data => { | |
| console.log('=============================') | |
| console.log(data) | |
| }) | |
| }) | |
| async function getPageInfo(url) { | |
| const metaProps = await getMetaProps(url) | |
| const site_name = resolveSiteName(metaProps) | |
| const title = resolveTitle(metaProps) | |
| const description = resolveDesc(metaProps) | |
| const image = resolveImageUrl(metaProps) | |
| return { site_name, title, description, image } | |
| } | |
| function resolveSiteName(metaProps) { | |
| const ogSiteName = getMetaPropContent(metaProps, 'og:site_name') | |
| if (ogSiteName) return ogSiteName | |
| return '(No SiteName)' | |
| } | |
| function resolveTitle(metaProps) { | |
| const ogTitle = getMetaPropContent(metaProps, 'og:title') | |
| if (ogTitle) return ogTitle | |
| return '(No Title)' | |
| } | |
| function resolveDesc(metaProps) { | |
| const ogDesc = getMetaPropContent(metaProps, 'og:description') | |
| if (ogDesc) return ogDesc | |
| return '' | |
| } | |
| function resolveImageUrl(metaProps) { | |
| const ogImage = getMetaPropContent(metaProps, 'og:image') | |
| if (ogImage) return ogImage | |
| return '' | |
| } | |
| function getMetaPropContent(metaProps, propKey) { | |
| const mpObj = metaProps.find((d, i, arr) => { | |
| return d[propKey] | |
| }) | |
| if (mpObj) return mpObj[propKey] | |
| return '' | |
| } | |
| async function getMetaProps(url) { | |
| const result = await fetch(url).then(res => { | |
| if (res.ok) { return res.text() } | |
| }).then(html => { | |
| const metaProps = extractMetaProps(html) | |
| return metaProps | |
| }).catch(e => { | |
| throw e | |
| }) | |
| return result | |
| } | |
| function extractMetaProps(html) { | |
| const $ = cheerio.load(html) | |
| let results = [] | |
| $('head meta').each((i, el) => { | |
| const property = $(el).attr('property') | |
| const content = $(el).attr('content') | |
| if (property && content) { | |
| results.push({ [property]: content }) | |
| } | |
| }) | |
| results.sort((a,b) => { | |
| if (Object.keys(a)[0] < Object.keys(b)[0]) return -1 | |
| if (Object.keys(a)[0] > Object.keys(b)[0]) return 1 | |
| return 0 | |
| }) | |
| return results | |
| } |
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