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'use strict'
const BB = require('bluebird')
const contentPath = require('./path')
const figgyPudding = require('figgy-pudding')
const fs = require('graceful-fs')
const PassThrough = require('stream').PassThrough
const pipe = BB.promisify(require('mississippi').pipe)
const ssri = require('ssri')
const Y = require('../util/y.js')
const lstatAsync = BB.promisify(fs.lstat)
const readFileAsync = BB.promisify(fs.readFile)
const ReadOpts = figgyPudding({
size: {}
})
module.exports = read
function read (cache, integrity, opts) {
opts = ReadOpts(opts)
return withContentSri(cache, integrity, (cpath, sri) => {
return readFileAsync(cpath, null).then(data => {
if (typeof opts.size === 'number' && opts.size !== data.length) {
throw sizeError(opts.size, data.length)
} else if (ssri.checkData(data, sri)) {
return data
} else {
throw integrityError(sri, cpath)
}
})
})
}
module.exports.sync = readSync
function readSync (cache, integrity, opts) {
opts = ReadOpts(opts)
return withContentSriSync(cache, integrity, (cpath, sri) => {
const data = fs.readFileSync(cpath)
if (typeof opts.size === 'number' && opts.size !== data.length) {
throw sizeError(opts.size, data.length)
} else if (ssri.checkData(data, sri)) {
return data
} else {
throw integrityError(sri, cpath)
}
})
}
module.exports.stream = readStream
module.exports.readStream = readStream
function readStream (cache, integrity, opts) {
opts = ReadOpts(opts)
const stream = new PassThrough()
withContentSri(cache, integrity, (cpath, sri) => {
return lstatAsync(cpath).then(stat => ({cpath, sri, stat}))
}).then(({cpath, sri, stat}) => {
return pipe(
fs.createReadStream(cpath),
ssri.integrityStream({
integrity: sri,
size: opts.size
}),
stream
)
}).catch(err => {
stream.emit('error', err)
})
return stream
}
let copyFileAsync
if (fs.copyFile) {
module.exports.copy = copy
module.exports.copy.sync = copySync
copyFileAsync = BB.promisify(fs.copyFile)
}
function copy (cache, integrity, dest, opts) {
opts = ReadOpts(opts)
return withContentSri(cache, integrity, (cpath, sri) => {
return copyFileAsync(cpath, dest)
})
}
function copySync (cache, integrity, dest, opts) {
opts = ReadOpts(opts)
return withContentSriSync(cache, integrity, (cpath, sri) => {
return fs.copyFileSync(cpath, dest)
})
}
module.exports.hasContent = hasContent
function hasContent (cache, integrity) {
if (!integrity) { return BB.resolve(false) }
return withContentSri(cache, integrity, (cpath, sri) => {
return lstatAsync(cpath).then(stat => ({size: stat.size, sri, stat}))
}).catch(err => {
if (err.code === 'ENOENT') { return false }
if (err.code === 'EPERM') {
if (process.platform !== 'win32') {
throw err
} else {
return false
}
}
})
}
module.exports.hasContent.sync = hasContentSync
function hasContentSync (cache, integrity) {
if (!integrity) { return false }
return withContentSriSync(cache, integrity, (cpath, sri) => {
try {
const stat = fs.lstatSync(cpath)
return {size: stat.size, sri, stat}
} catch (err) {
if (err.code === 'ENOENT') { return false }
if (err.code === 'EPERM') {
if (process.platform !== 'win32') {
throw err
} else {
return false
}
}
}
})
}
function withContentSri (cache, integrity, fn) {
return BB.try(() => {
const sri = ssri.parse(integrity)
// If `integrity` has multiple entries, pick the first digest
// with available local data.
const algo = sri.pickAlgorithm()
const digests = sri[algo]
if (digests.length <= 1) {
const cpath = contentPath(cache, digests[0])
return fn(cpath, digests[0])
} else {
return BB.any(sri[sri.pickAlgorithm()].map(meta => {
return withContentSri(cache, meta, fn)
}, {concurrency: 1}))
.catch(err => {
if ([].some.call(err, e => e.code === 'ENOENT')) {
throw Object.assign(
new Error('No matching content found for ' + sri.toString()),
{code: 'ENOENT'}
)
} else {
throw err[0]
}
})
}
})
}
function withContentSriSync (cache, integrity, fn) {
const sri = ssri.parse(integrity)
// If `integrity` has multiple entries, pick the first digest
// with available local data.
const algo = sri.pickAlgorithm()
const digests = sri[algo]
if (digests.length <= 1) {
const cpath = contentPath(cache, digests[0])
return fn(cpath, digests[0])
} else {
let lastErr = null
for (const meta of sri[sri.pickAlgorithm()]) {
try {
return withContentSriSync(cache, meta, fn)
} catch (err) {
lastErr = err
}
}
if (lastErr) { throw lastErr }
}
}
function sizeError (expected, found) {
var err = new Error(Y`Bad data size: expected inserted data to be ${expected} bytes, but got ${found} instead`)
err.expected = expected
err.found = found
err.code = 'EBADSIZE'
return err
}
function integrityError (sri, path) {
var err = new Error(Y`Integrity verification failed for ${sri} (${path})`)
err.code = 'EINTEGRITY'
err.sri = sri
err.path = path
return err
}
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