mirror of
https://github.com/overleaf/overleaf.git
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121 lines
3.3 KiB
JavaScript
121 lines
3.3 KiB
JavaScript
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const crypto = require('crypto')
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const fs = require('fs')
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const Path = require('path')
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const cheerio = require('cheerio')
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const prettier = require('prettier')
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const sanitizeHtml = require('sanitize-html')
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const {
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sanitizeOptions,
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} = require('../../../modules/learn/app/src/sanitizeOptions')
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const EXTRACT_STYLE = process.env.EXTRACT_STYLES === 'true'
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const OMIT_STYLE = process.env.OMIT_STYLE !== 'false'
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const DUMP_CSS_IN = Path.join(
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Path.dirname(Path.dirname(Path.dirname(__dirname))),
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'data',
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'dumpFolder'
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)
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function hash(blob) {
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return crypto.createHash('sha1').update(blob).digest('hex')
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}
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function normalize(blob, title) {
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// styles are dropped in web and kept in wiki pages for previewing there.
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blob = blob.replace(/<style>(.+?)<\/style>/gs, (_, match) => {
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if (EXTRACT_STYLE) {
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// normalize css with prettier
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const css = prettier.format(match, { parser: 'css' })
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fs.writeFileSync(
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Path.join(DUMP_CSS_IN, `${hash(css)}-${encodeURIComponent(title)}.css`),
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`/* title: ${title} */\n\n${css}`
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)
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}
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if (OMIT_STYLE) {
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return ''
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}
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return match
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})
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// strip comments:
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// - comment at the bottom of each page
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blob = blob.replace(/<!-- \nNewPP limit report.+/s, '')
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// - annotation of math characters
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blob = blob.replace(/<!-- . -->/g, '')
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// wrap for consistent rendering
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if (blob.indexOf('<html><head>') !== 0) {
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blob = `<html><head>${blob}</head></html>`
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}
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// normalize inline style:
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// - drop trailing ;
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blob = blob.replace(/style="([^"]+);"/g, (_, style) => `style="${style}"`)
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// - normalize whitespace
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blob = blob.replace(
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/style="([^"]+)"/g,
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(_, style) => `style="${style.trim().replace(/([:;])\s+/g, '$1')}"`
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)
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// let cherrio do another pass
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return cheerio.load(blob).html()
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}
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function toText(blob) {
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return cheerio.load(blob).text()
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}
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const zoomOut = 50
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function peak(content, offset) {
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// show some more content before/after the mismatch
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if (offset > zoomOut) {
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offset -= zoomOut
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}
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// wrap in JSON to escape new line characters
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return JSON.stringify(content.slice(offset, offset + chunkSize + 2 * zoomOut))
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}
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const chunkSize = 100
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function findFirstMismatch(a, b) {
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if (a === b) return a.length
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let i = 0
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while (
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a.length > chunkSize &&
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b.length > chunkSize &&
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a.slice(0, chunkSize) === b.slice(0, chunkSize)
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) {
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i++
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a = a.slice(chunkSize)
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b = b.slice(chunkSize)
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}
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return i * chunkSize
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}
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function checkSanitizeOptions(page, title, text) {
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text = normalize(text, title)
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const sanitized = normalize(sanitizeHtml(text, sanitizeOptions))
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if (text === sanitized) return
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const offset = findFirstMismatch(text, sanitized)
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const textToText = toText(text)
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const sanitizedToText = toText(sanitized)
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const offsetText = findFirstMismatch(textToText, sanitizedToText)
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console.error('---')
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console.error('page :', page)
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console.error('title :', title)
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console.error('match :', text === sanitized)
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console.error('toText :', toText(text) === toText(sanitized))
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console.error('text :', peak(text, offset))
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console.error('sanitized :', peak(sanitized, offset))
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console.error('textToText :', peak(textToText, offsetText))
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console.error('sanitizedToText:', peak(sanitizedToText, offsetText))
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}
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module.exports = {
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checkSanitizeOptions,
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}
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