mirror of
https://github.com/overleaf/overleaf.git
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103 lines
3.2 KiB
JavaScript
103 lines
3.2 KiB
JavaScript
/* eslint-disable
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handle-callback-err,
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no-return-assign,
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no-undef,
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no-unused-vars,
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node/no-deprecated-api,
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*/
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// TODO: This file was created by bulk-decaffeinate.
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// Fix any style issues and re-enable lint.
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/*
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* decaffeinate suggestions:
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* DS102: Remove unnecessary code created because of implicit returns
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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let OutputFileOptimiser
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const fs = require('fs')
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const Path = require('path')
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const { spawn } = require('child_process')
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const logger = require('logger-sharelatex')
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const Metrics = require('./Metrics')
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const _ = require('lodash')
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module.exports = OutputFileOptimiser = {
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optimiseFile(src, dst, callback) {
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// check output file (src) and see if we can optimise it, storing
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// the result in the build directory (dst)
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if (callback == null) {
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callback = function(error) {}
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}
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if (src.match(/\/output\.pdf$/)) {
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return OutputFileOptimiser.checkIfPDFIsOptimised(src, function(
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err,
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isOptimised
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) {
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if (err != null || isOptimised) {
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return callback(null)
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}
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return OutputFileOptimiser.optimisePDF(src, dst, callback)
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})
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} else {
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return callback(null)
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}
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},
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checkIfPDFIsOptimised(file, callback) {
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const SIZE = 16 * 1024 // check the header of the pdf
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const result = Buffer.alloc(SIZE) // fills with zeroes by default
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return fs.open(file, 'r', function(err, fd) {
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if (err != null) {
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return callback(err)
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}
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return fs.read(fd, result, 0, SIZE, 0, (errRead, bytesRead, buffer) =>
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fs.close(fd, function(errClose) {
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if (errRead != null) {
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return callback(errRead)
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}
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if (typeof errReadClose !== 'undefined' && errReadClose !== null) {
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return callback(errClose)
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}
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const isOptimised =
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buffer.toString('ascii').indexOf('/Linearized 1') >= 0
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return callback(null, isOptimised)
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})
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)
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})
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},
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optimisePDF(src, dst, callback) {
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if (callback == null) {
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callback = function(error) {}
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}
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const tmpOutput = dst + '.opt'
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const args = ['--linearize', src, tmpOutput]
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logger.log({ args }, 'running qpdf command')
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const timer = new Metrics.Timer('qpdf')
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const proc = spawn('qpdf', args)
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let stdout = ''
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proc.stdout.setEncoding('utf8').on('data', chunk => (stdout += chunk))
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callback = _.once(callback) // avoid double call back for error and close event
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proc.on('error', function(err) {
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logger.warn({ err, args }, 'qpdf failed')
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return callback(null)
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}) // ignore the error
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return proc.on('close', function(code) {
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timer.done()
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if (code !== 0) {
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logger.warn({ code, args }, 'qpdf returned error')
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return callback(null) // ignore the error
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}
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return fs.rename(tmpOutput, dst, function(err) {
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if (err != null) {
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logger.warn(
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{ tmpOutput, dst },
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'failed to rename output of qpdf command'
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)
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}
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return callback(null)
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})
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})
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} // ignore the error
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}
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