overleaf/services/filestore/app/js/FileHandler.js

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const { promisify } = require('util')
const fs = require('fs')
const PersistorManager = require('./PersistorManager')
const LocalFileWriter = require('./LocalFileWriter')
const logger = require('logger-sharelatex')
const FileConverter = require('./FileConverter')
const KeyBuilder = require('./KeyBuilder')
const async = require('async')
const ImageOptimiser = require('./ImageOptimiser')
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const {
WriteError,
ReadError,
ConversionError,
NotFoundError
} = require('./Errors')
module.exports = {
insertFile,
deleteFile,
getFile,
getFileSize,
getDirectorySize,
promises: {
getFile: promisify(getFile),
insertFile: promisify(insertFile),
deleteFile: promisify(deleteFile),
getFileSize: promisify(getFileSize),
getDirectorySize: promisify(getDirectorySize)
}
}
function insertFile(bucket, key, stream, callback) {
const convertedKey = KeyBuilder.getConvertedFolderKey(key)
PersistorManager.deleteDirectory(bucket, convertedKey, function(error) {
if (error) {
return callback(new WriteError('error inserting file').withCause(error))
}
PersistorManager.sendStream(bucket, key, stream, callback)
})
}
function deleteFile(bucket, key, callback) {
const convertedKey = KeyBuilder.getConvertedFolderKey(key)
async.parallel(
[
done => PersistorManager.deleteFile(bucket, key, done),
done => PersistorManager.deleteDirectory(bucket, convertedKey, done)
],
callback
)
}
function getFile(bucket, key, opts, callback) {
// In this call, opts can contain credentials
if (!opts) {
opts = {}
}
logger.log({ bucket, key, opts: _scrubSecrets(opts) }, 'getting file')
if (!opts.format && !opts.style) {
_getStandardFile(bucket, key, opts, callback)
} else {
_getConvertedFile(bucket, key, opts, callback)
}
}
function getFileSize(bucket, key, callback) {
PersistorManager.getFileSize(bucket, key, callback)
}
function getDirectorySize(bucket, projectId, callback) {
logger.log({ bucket, project_id: projectId }, 'getting project size')
PersistorManager.directorySize(bucket, projectId, function(err, size) {
if (err) {
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return callback(
new ReadError('error getting project size').withCause(err)
)
}
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callback(null, size)
})
}
function _getStandardFile(bucket, key, opts, callback) {
PersistorManager.getFileStream(bucket, key, opts, function(err, fileStream) {
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if (err && !(err instanceof NotFoundError)) {
logger.err(
{ bucket, key, opts: _scrubSecrets(opts) },
'error getting fileStream'
)
}
callback(err, fileStream)
})
}
function _getConvertedFile(bucket, key, opts, callback) {
const convertedKey = KeyBuilder.addCachingToKey(key, opts)
PersistorManager.checkIfFileExists(bucket, convertedKey, (err, exists) => {
if (err) {
return callback(err)
}
if (exists) {
PersistorManager.getFileStream(bucket, convertedKey, opts, callback)
} else {
_getConvertedFileAndCache(bucket, key, convertedKey, opts, callback)
}
})
}
function _getConvertedFileAndCache(bucket, key, convertedKey, opts, callback) {
let convertedFsPath
async.series(
[
cb => {
_convertFile(bucket, key, opts, function(err, fileSystemPath) {
convertedFsPath = fileSystemPath
cb(err)
})
},
cb => ImageOptimiser.compressPng(convertedFsPath, cb),
cb => PersistorManager.sendFile(bucket, convertedKey, convertedFsPath, cb)
],
function(err) {
if (err) {
LocalFileWriter.deleteFile(convertedFsPath, function() {})
return callback(
new ConversionError('failed to convert file').withCause(err)
)
}
// Send back the converted file from the local copy to avoid problems
// with the file not being present in S3 yet. As described in the
// documentation below, we have already made a 'HEAD' request in
// checkIfFileExists so we only have "eventual consistency" if we try
// to stream it from S3 here. This was a cause of many 403 errors.
//
// "Amazon S3 provides read-after-write consistency for PUTS of new
// objects in your S3 bucket in all regions with one caveat. The
// caveat is that if you make a HEAD or GET request to the key name
// (to find if the object exists) before creating the object, Amazon
// S3 provides eventual consistency for read-after-write.""
// https://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html#ConsistencyModel
const readStream = fs.createReadStream(convertedFsPath)
readStream.on('end', function() {
LocalFileWriter.deleteFile(convertedFsPath, function() {})
})
callback(null, readStream)
}
)
}
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function _convertFile(bucket, originalKey, opts, callback) {
_writeFileToDisk(bucket, originalKey, opts, function(err, originalFsPath) {
if (err) {
return callback(
new ConversionError('unable to write file to disk').withCause(err)
)
}
const done = function(err, destPath) {
if (err) {
logger.err(
{ err, bucket, originalKey, opts: _scrubSecrets(opts) },
'error converting file'
)
return callback(
new ConversionError('error converting file').withCause(err)
)
}
LocalFileWriter.deleteFile(originalFsPath, function() {})
callback(err, destPath)
}
logger.log({ opts }, 'converting file depending on opts')
if (opts.format) {
FileConverter.convert(originalFsPath, opts.format, done)
} else if (opts.style === 'thumbnail') {
FileConverter.thumbnail(originalFsPath, done)
} else if (opts.style === 'preview') {
FileConverter.preview(originalFsPath, done)
} else {
callback(
new ConversionError(
`should have specified opts to convert file with ${JSON.stringify(
opts
)}`
)
)
}
})
}
function _writeFileToDisk(bucket, key, opts, callback) {
PersistorManager.getFileStream(bucket, key, opts, function(err, fileStream) {
if (err) {
return callback(
new ReadError('unable to get read stream for file').withCause(err)
)
}
LocalFileWriter.writeStream(fileStream, key, callback)
})
}
function _scrubSecrets(opts) {
const safe = Object.assign({}, opts)
delete safe.credentials
return safe
}