mirror of https://gitlab.com/curben/blog
142 lines
3.8 KiB
JavaScript
142 lines
3.8 KiB
JavaScript
'use strict'
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/* global hexo */
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/*
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* Modified from the hexo version,
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* https://github.com/hexojs/hexo/blob/master/lib/plugins/helper/open_graph.js
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* to include https://github.com/hexojs/hexo/pull/3674
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* and use WHATWG URL API
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* https://nodejs.org/api/url.html#url_the_whatwg_url_api
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*/
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'use strict'
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const moment = require('moment')
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const { encodeURL, htmlTag, stripHTML } = require('hexo-util')
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function meta (name, content) {
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return `${htmlTag('meta', {
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name,
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content
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})}\n`
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}
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function og (name, content) {
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return `${htmlTag('meta', {
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property: name,
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content
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})}\n`
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}
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function openGraphHelper (options = {}) {
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const { config, page, theme } = this
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const { content } = page
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let images = page.photos || []
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let description = page.excerpt || theme.description
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const keywords = page.keywords || (page.tags && page.tags.length ? page.tags : undefined) || config.keywords
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const title = page.title || theme.nickname
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const type = (this.is_post() ? 'article' : 'website')
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const url = encodeURL(this.url)
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const siteName = theme.nickname
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const twitterCard = options.twitter_card || 'summary'
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const published = page.date || false
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const updated = page.lastUpdated || false
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const language = options.language || page.lang || page.language || config.language
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let result = ''
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if (!Array.isArray(images)) images = [images]
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if (description) {
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description = stripHTML(description).substring(0, 200)
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.trim() // Remove prefixing/trailing spaces
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/&/g, '&')
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.replace(/"/g, '"')
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.replace(/'/g, ''')
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.replace(/\n/g, ' ') // Replace new lines by spaces
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}
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if (!images.length && content && content.includes('<img')) {
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images = images.slice()
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let img
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const imgPattern = /<img [^>]*src=['"]([^'"]+)([^>]*>)/gi
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while ((img = imgPattern.exec(content)) !== null) {
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images.push(img[1])
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}
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}
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if (description) {
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result += meta('description', description)
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}
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if (keywords) {
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if (typeof keywords === 'string') {
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result += meta('keywords', keywords)
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} else if (keywords.length) {
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result += meta('keywords', keywords.map(tag => {
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return tag.name ? tag.name : tag
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}).filter(keyword => !!keyword).join())
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}
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}
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result += og('og:type', type)
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result += og('og:title', title)
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result += og('og:url', url)
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result += og('og:site_name', siteName)
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if (description) {
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result += og('og:description', description)
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}
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if (language) {
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result += og('og:locale', language)
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}
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images = images.map(path => {
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let url
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// resolve `path`'s absolute path relative to current page's url
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// `path` can be both absolute (starts with `/`) or relative.
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try {
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url = new URL(path).href
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} catch (e) {
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url = new URL(path, config.url).href
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return url
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}
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return url
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})
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images.forEach(path => {
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result += og('og:image', path)
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})
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if (published) {
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if ((moment.isMoment(published) || moment.isDate(published)) && !isNaN(published.valueOf()) &&
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this.is_post()) {
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// Skip timezone conversion
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result += og('article:published_time', moment(published).format('YYYY-MM-DD[T00:00:00.000Z]'))
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}
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}
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if (updated) {
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if ((moment.isMoment(updated) || moment.isDate(updated)) && !isNaN(updated.valueOf())) {
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result += og('og:updated_time', moment(updated).format('YYYY-MM-DD[T00:00:00.000Z]'))
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if (this.is_post()) {
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result += og('article:modified_time', moment(updated).format('YYYY-MM-DD[T00:00:00.000Z]'))
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}
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}
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}
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result += meta('twitter:card', twitterCard)
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if (images.length) {
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result += meta('twitter:image', images[0])
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}
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return result.trim()
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}
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hexo.extend.helper.register('openGraph', openGraphHelper)
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