const Settings = require('@overleaf/settings') const { callbackify } = require('util') const fs = require('fs') const PersistorManager = require('./PersistorManager') const LocalFileWriter = require('./LocalFileWriter') const FileConverter = require('./FileConverter') const KeyBuilder = require('./KeyBuilder') const ImageOptimiser = require('./ImageOptimiser') const { ConversionError, InvalidParametersError } = require('./Errors') const metrics = require('@overleaf/metrics') module.exports = { insertFile: callbackify(insertFile), deleteFile: callbackify(deleteFile), deleteProject: callbackify(deleteProject), getFile: callbackify(getFile), getRedirectUrl: callbackify(getRedirectUrl), getFileSize: callbackify(getFileSize), getDirectorySize: callbackify(getDirectorySize), promises: { getFile, getRedirectUrl, insertFile, deleteFile, deleteProject, getFileSize, getDirectorySize, }, } async function insertFile(bucket, key, stream) { const convertedKey = KeyBuilder.getConvertedFolderKey(key) if (!convertedKey.match(/^[0-9a-f]{24}\/([0-9a-f]{24}|v\/[0-9]+\/[a-z]+)/i)) { throw new InvalidParametersError('key does not match validation regex', { bucket, key, convertedKey, }) } if (Settings.enableConversions) { await PersistorManager.deleteDirectory(bucket, convertedKey) } await PersistorManager.sendStream(bucket, key, stream) } async function deleteFile(bucket, key) { const convertedKey = KeyBuilder.getConvertedFolderKey(key) if (!convertedKey.match(/^[0-9a-f]{24}\/([0-9a-f]{24}|v\/[0-9]+\/[a-z]+)/i)) { throw new InvalidParametersError('key does not match validation regex', { bucket, key, convertedKey, }) } const jobs = [PersistorManager.deleteObject(bucket, key)] if (Settings.enableConversions) { jobs.push(PersistorManager.deleteDirectory(bucket, convertedKey)) } await Promise.all(jobs) } async function deleteProject(bucket, key) { if (!key.match(/^[0-9a-f]{24}\//i)) { throw new InvalidParametersError('key does not match validation regex', { bucket, key, }) } await PersistorManager.deleteDirectory(bucket, key) } async function getFile(bucket, key, opts) { opts = opts || {} if (!opts.format && !opts.style) { return await PersistorManager.getObjectStream(bucket, key, opts) } else { return await _getConvertedFile(bucket, key, opts) } } let ACTIVE_SIGNED_URL_CALLS = 0 async function getRedirectUrl(bucket, key, opts) { // if we're doing anything unusual with options, or the request isn't for // one of the default buckets, return null so that we proxy the file opts = opts || {} if ( !opts.start && !opts.end && !opts.format && !opts.style && Object.values(Settings.filestore.stores).includes(bucket) && Settings.filestore.allowRedirects ) { // record the number of in-flight calls to generate signed URLs metrics.gauge('active_signed_url_calls', ++ACTIVE_SIGNED_URL_CALLS, { path: bucket, }) try { const timer = new metrics.Timer('signed_url_call_time', { path: bucket, }) const redirectUrl = await PersistorManager.getRedirectUrl(bucket, key) timer.done() return redirectUrl } finally { metrics.gauge('active_signed_url_calls', --ACTIVE_SIGNED_URL_CALLS, { path: bucket, }) } } return null } async function getFileSize(bucket, key) { return await PersistorManager.getObjectSize(bucket, key) } async function getDirectorySize(bucket, projectId) { return PersistorManager.directorySize(bucket, projectId) } async function _getConvertedFile(bucket, key, opts) { const convertedKey = KeyBuilder.addCachingToKey(key, opts) const exists = await PersistorManager.checkIfObjectExists( bucket, convertedKey ) if (exists) { return await PersistorManager.getObjectStream(bucket, convertedKey, opts) } else { return await _getConvertedFileAndCache(bucket, key, convertedKey, opts) } } async function _getConvertedFileAndCache(bucket, key, convertedKey, opts) { let convertedFsPath try { convertedFsPath = await _convertFile(bucket, key, opts) await ImageOptimiser.promises.compressPng(convertedFsPath) await PersistorManager.sendFile(bucket, convertedKey, convertedFsPath) } catch (err) { LocalFileWriter.deleteFile(convertedFsPath, () => {}) throw new ConversionError( 'failed to convert file', { opts, bucket, key, convertedKey }, 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('error', function () { LocalFileWriter.deleteFile(convertedFsPath, function () {}) }) readStream.on('end', function () { LocalFileWriter.deleteFile(convertedFsPath, function () {}) }) return readStream } async function _convertFile(bucket, originalKey, opts) { let originalFsPath try { originalFsPath = await _writeFileToDisk(bucket, originalKey, opts) } catch (err) { throw new ConversionError( 'unable to write file to disk', { bucket, originalKey, opts }, err ) } let promise if (opts.format) { promise = FileConverter.promises.convert(originalFsPath, opts.format) } else if (opts.style === 'thumbnail') { promise = FileConverter.promises.thumbnail(originalFsPath) } else if (opts.style === 'preview') { promise = FileConverter.promises.preview(originalFsPath) } else { throw new ConversionError('invalid file conversion options', { bucket, originalKey, opts, }) } let destPath try { destPath = await promise } catch (err) { throw new ConversionError( 'error converting file', { bucket, originalKey, opts }, err ) } LocalFileWriter.deleteFile(originalFsPath, function () {}) return destPath } async function _writeFileToDisk(bucket, key, opts) { const fileStream = await PersistorManager.getObjectStream(bucket, key, opts) return await LocalFileWriter.promises.writeStream(fileStream, key) }