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'use strict'
const BB = require('bluebird')
const contentPath = require('./path')
const fixOwner = require('../util/fix-owner')
const fs = require('graceful-fs')
const moveFile = require('../util/move-file')
const PassThrough = require('stream').PassThrough
const path = require('path')
const pipe = BB.promisify(require('mississippi').pipe)
const rimraf = BB.promisify(require('rimraf'))
const ssri = require('ssri')
const to = require('mississippi').to
const uniqueFilename = require('unique-filename')
const writeFileAsync = BB.promisify(fs.writeFile)
module.exports = write
function write (cache, data, opts) {
opts = opts || {}
if (opts.algorithms && opts.algorithms.length > 1) {
throw new Error(
'opts.algorithms only supports a single algorithm for now'
)
}
if (typeof opts.size === 'number' && data.length !== opts.size) {
return BB.reject(sizeError(opts.size, data.length))
}
const sri = ssri.fromData(data, opts)
if (opts.integrity && !ssri.checkData(data, opts.integrity, opts)) {
return BB.reject(checksumError(opts.integrity, sri))
}
return BB.using(makeTmp(cache, opts), tmp => (
writeFileAsync(
tmp.target, data, {flag: 'wx'}
).then(() => (
moveToDestination(tmp, cache, sri, opts)
))
)).then(() => ({integrity: sri, size: data.length}))
}
module.exports.stream = writeStream
function writeStream (cache, opts) {
opts = opts || {}
const inputStream = new PassThrough()
let inputErr = false
function errCheck () {
if (inputErr) { throw inputErr }
}
let allDone
const ret = to((c, n, cb) => {
if (!allDone) {
allDone = handleContent(inputStream, cache, opts, errCheck)
}
inputStream.write(c, n, cb)
}, cb => {
inputStream.end(() => {
if (!allDone) {
const e = new Error('Input stream was empty')
e.code = 'ENODATA'
return ret.emit('error', e)
}
allDone.then(res => {
res.integrity && ret.emit('integrity', res.integrity)
res.size !== null && ret.emit('size', res.size)
cb()
}, e => {
ret.emit('error', e)
})
})
})
ret.once('error', e => {
inputErr = e
})
return ret
}
function handleContent (inputStream, cache, opts, errCheck) {
return BB.using(makeTmp(cache, opts), tmp => {
errCheck()
return pipeToTmp(
inputStream, cache, tmp.target, opts, errCheck
).then(res => {
return moveToDestination(
tmp, cache, res.integrity, opts, errCheck
).then(() => res)
})
})
}
function pipeToTmp (inputStream, cache, tmpTarget, opts, errCheck) {
return BB.resolve().then(() => {
let integrity
let size
const hashStream = ssri.integrityStream({
integrity: opts.integrity,
algorithms: opts.algorithms,
size: opts.size
}).on('integrity', s => {
integrity = s
}).on('size', s => {
size = s
})
const outStream = fs.createWriteStream(tmpTarget, {
flags: 'wx'
})
errCheck()
return pipe(inputStream, hashStream, outStream).then(() => {
return {integrity, size}
}, err => {
return rimraf(tmpTarget).then(() => { throw err })
})
})
}
function makeTmp (cache, opts) {
const tmpTarget = uniqueFilename(path.join(cache, 'tmp'), opts.tmpPrefix)
return fixOwner.mkdirfix(
path.dirname(tmpTarget), opts.uid, opts.gid
).then(() => ({
target: tmpTarget,
moved: false
})).disposer(tmp => (!tmp.moved && rimraf(tmp.target)))
}
function moveToDestination (tmp, cache, sri, opts, errCheck) {
errCheck && errCheck()
const destination = contentPath(cache, sri)
const destDir = path.dirname(destination)
return fixOwner.mkdirfix(
destDir, opts.uid, opts.gid
).then(() => {
errCheck && errCheck()
return moveFile(tmp.target, destination)
}).then(() => {
errCheck && errCheck()
tmp.moved = true
return fixOwner.chownr(destination, opts.uid, opts.gid)
})
}
function sizeError (expected, found) {
var err = new Error('stream data size mismatch')
err.expected = expected
err.found = found
err.code = 'EBADSIZE'
return err
}
function checksumError (expected, found) {
var err = new Error('checksum failed')
err.code = 'EINTEGRITY'
err.expected = expected
err.found = found
return err
}
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