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const formidable = require('formidable')
const uuidv1 = require('uuid/v1')
const config = require('config')
const { PassThrough } = require('stream')
const minioClient = require('./minio-client.js')
const utils = require('./utils')
const logger = (config && config.logger) || console
const Ops = Object.freeze({
post: 1,
list: 2,
get: 3,
getStream: 4,
delete: 5,
postStream: 6
})
const extractFileExtension = filename => {
return filename.split('.').pop()
}
const validityCheck = (req, options) => {
if (!options) {
const error = 'Options not provided'
req.minio = { error }
return false
}
let supported = false
Object.keys(Ops).forEach(key => {
if (Ops[key] === options.op) {
supported = true
}
})
if (!supported) {
const error = 'Operation not supported'
req.minio = { error }
return false
}
return true
}
const getFileMetaData = stat => {
Eif (stat && stat.metaData) {
return {
filename: Buffer.from(stat.metaData['file-name'], 'base64').toString(
'utf8'
),
contentType: stat.metaData['content-type']
}
}
return {}
}
const handlePost = (req, next, fields, files) => {
let filename = uuidv1()
Eif (files.file && files.file.name) {
const extension = extractFileExtension(files.file.name)
Eif (extension) {
filename += `.${extension}`
}
}
minioClient.uploadFile(
filename,
(files.file && files.file.name) || '',
(files.file && files.file.type) || '',
(files.file && files.file.path) || '',
(error, etag) => {
Iif (error) {
req.minio = { error }
} else {
req.minio = { post: { filename: `${filename}`, etag } }
}
next()
}
)
}
const handlePostStream = async (req, next, files, fileStream) => {
let filename = uuidv1()
Eif (files.file && files.file.name) {
const extension = extractFileExtension(files.file.name)
Eif (extension) {
filename += `.${extension}`
}
}
try {
const etag = await minioClient.uploadFileSteam(
filename,
(files.file && files.file.name) || '',
(files.file && files.file.type) || '',
fileStream
)
req.minio = { post: { filename: `${filename}`, etag } }
} catch (error) {
console.log('error: ', error)
req.minio = { error }
}
next()
}
const handleList = (req, next) => {
minioClient.listFiles((error, list) => {
Iif (error) {
req.minio = { error }
} else {
req.minio = { list }
}
next()
})
}
const handleGet = async (req, next) => {
let stat
try {
stat = await minioClient.getFileStat(req.params.filename)
} catch (error) {
req.minio = { error }
next()
return
}
const tmpFile = utils.getTempPath(req.params.filename)
minioClient.getFile(req.params.filename, tmpFile, error => {
Iif (error) {
req.minio = { error }
} else {
let { filename, contentType } = getFileMetaData(stat)
Iif (!filename) {
filename = req.params.filename
}
req.minio = {
get: {
path: tmpFile,
originalName: filename,
contentType,
contentLength: stat.size
}
}
}
next()
})
}
const handleGetStream = async (req, next) => {
let stat
try {
stat = await minioClient.getFileStat(req.params.filename)
} catch (error) {
logger.error('minio handleGetSteam error: ', error)
req.minio = { error }
next()
return
}
minioClient.getFileStream(req.params.filename, (error, stream) => {
Iif (error) {
req.minio = { error }
} else {
let { filename, contentType } = getFileMetaData(stat)
Iif (!filename) {
filename = req.params.filename
}
req.minio = {
get: {
stream,
originalName: filename,
contentLength: stream.headers['content-length'],
contentType
}
}
}
next()
})
}
const handleDelete = async (req, next) => {
Iif (!req.params.filename || req.params.filename === 'undefined') {
req.minio = { error: 'File name not specified' }
next()
return
}
const error = await minioClient.deleteFile(req.params.filename)
Iif (error) {
req.minio = { error }
} else {
req.minio = { delete: 'Success' }
}
next()
}
const handleRequests = (req, next, options) => {
if (!validityCheck(req, options)) {
next()
return
}
if (options.op === Ops.post) {
const form = new formidable.IncomingForm()
form.parse(req, (err, fields, files) => {
Iif (err) {
req.minio = { error: err }
next()
} else if (!files.file) {
req.minio = { error: 'No file attached to post' }
next()
} else {
handlePost(req, next, fields, files)
}
})
} else if (options.op === Ops.postStream) {
const form = new formidable.IncomingForm()
const pass = new PassThrough()
const files = { file: {} }
form.onPart = part => {
Iif (!part.filename) {
form.handlePart(part)
return
}
files.file.name = part.filename
files.file.type = part.mime
part.on('data', function (buffer) {
pass.write(buffer)
})
part.on('end', function () {
pass.end()
})
}
form.parse(req, err => {
Iif (err) {
req.minio = { error: err }
next()
} else {
handlePostStream(req, next, files, pass)
}
})
} else if (options.op === Ops.list) {
handleList(req, next)
} else if (options.op === Ops.get) {
handleGet(req, next)
} else if (options.op === Ops.getStream) {
handleGetStream(req, next)
} else Eif (options.op === Ops.delete) {
handleDelete(req, next)
}
}
module.exports = {
Ops,
utils,
minioClient,
middleware () {
return options => (req, res, next) => {
handleRequests(req, next, options)
}
}
}
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