overleaf/services/filestore/app/js/FileConverter.js

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const metrics = require('@overleaf/metrics')
const Settings = require('settings-sharelatex')
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const { callbackify } = require('util')
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const safeExec = require('./SafeExec').promises
const { ConversionError } = require('./Errors')
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const APPROVED_FORMATS = ['png']
const FOURTY_SECONDS = 40 * 1000
const KILL_SIGNAL = 'SIGTERM'
module.exports = {
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convert: callbackify(convert),
thumbnail: callbackify(thumbnail),
preview: callbackify(preview),
promises: {
convert,
thumbnail,
preview
}
}
async function convert(sourcePath, requestedFormat) {
const width = '600x'
return _convert(sourcePath, requestedFormat, [
'convert',
'-define',
`pdf:fit-page=${width}`,
'-flatten',
'-density',
'300',
`${sourcePath}[0]`
])
}
async function thumbnail(sourcePath) {
const width = '260x'
return convert(sourcePath, 'png', [
'convert',
'-flatten',
'-background',
'white',
'-density',
'300',
'-define',
`pdf:fit-page=${width}`,
`${sourcePath}[0]`,
'-resize',
width
])
}
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async function preview(sourcePath) {
const width = '548x'
return convert(sourcePath, 'png', [
'convert',
'-flatten',
'-background',
'white',
'-density',
'300',
'-define',
`pdf:fit-page=${width}`,
`${sourcePath}[0]`,
'-resize',
width
])
}
async function _convert(sourcePath, requestedFormat, command) {
if (!APPROVED_FORMATS.includes(requestedFormat)) {
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throw new ConversionError('invalid format requested', {
format: requestedFormat
})
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}
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const timer = new metrics.Timer('imageConvert')
const destPath = `${sourcePath}.${requestedFormat}`
command.push(destPath)
command = Settings.commands.convertCommandPrefix.concat(command)
try {
await safeExec(command, {
killSignal: KILL_SIGNAL,
timeout: FOURTY_SECONDS
})
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} catch (err) {
throw new ConversionError(
'something went wrong converting file',
{ stderr: err.stderr, sourcePath, requestedFormat, destPath },
err
)
}
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timer.done()
return destPath
}