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s3-helpers.js
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s3-helpers.js
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//@ts-check
const copy = exports.copy = function copy(s3, bucket, source, target) {
return new Promise((resolve, reject) => {
const params = {
Bucket: bucket,
CopySource: `/${bucket}/${source}`,
Key: target,
}
s3.copyObject(params, (err, data) => {
if (err) return reject(err)
resolve(data)
})
})
}
exports.delete = async function deleteObject(s3, bucket, key) {
await copy(s3, bucket, key, 'deleted/' + key)
const params = {
Bucket: bucket,
Key: key
}
return new Promise((resolve, reject) => {
s3.deleteObject(params, (err, data) => {
if (err) return reject(err)
resolve(data)
})
})
}
exports.exists = function exists(s3, bucket, key) {
return new Promise((resolve, reject) => {
var params = {
Bucket: bucket,
Key: key
}
s3.headObject(params, function cb(err, data) {
if (err) {
switch (err.statusCode) {
case 404:
return resolve(false)
default:
return reject(err)
}
}
return !data ? resolve(false) : resolve(true)
})
})
}
exports.get = function get(s3, bucket, key) {
return new Promise((resolve, reject) => {
var params = {
Bucket: bucket,
Key: key
}
s3.getObject(params, (err, data) => {
if (err) return reject(err)
return resolve(data.Body)
})
})
}
exports.head = function head(s3, bucket, key) {
return new Promise((resolve, reject) => {
var params = {
Bucket: bucket,
Key: key
}
s3.headObject(params, (err, data) => {
if (err) {
switch (err.code) {
case 'NotFound':
return resolve(null)
default:
return reject(err)
}
}
return resolve(data)
})
})
}
exports.list = function list(s3, bucket, prefix, options = {}) {
return new Promise((resolve, reject) => {
var params = Object.assign({
Bucket: bucket,
Prefix: prefix
}, options)
return s3.listObjectsV2(params, (err, data) => {
if (err) return reject(err)
var { ContinuationToken, KeyCount, IsTruncated, MaxKeys, NextContinuationToken } = data
if (IsTruncated) {
var nextParams = Object.assign({}, params, {
ContinuationToken: NextContinuationToken
})
}
var res = {
keys: data.Contents.map(Content => Content.Key),
data: {
ContinuationToken,
KeyCount, MaxKeys
},
keyCount: KeyCount,
isTruncated: IsTruncated,
nextParams
}
resolve(res)
})
})
}
exports.stream = function stream(s3, bucket, key) {
var params = {
Bucket: bucket,
Key: key
}
return s3.getObject(params).createReadStream()
}
exports.upload = function upload(s3, bucket, key, file, options = {}) {
const mime = require('mime-types')
return new Promise((resolve, reject) => {
const opts = {}
if (mime.lookup(key)) {
opts.ContentType = mime.lookup(key)
}
const params = Object.assign({
Bucket: bucket,
Key: key,
Body: file,
ACL: 'authenticated-read',
ContentDisposition: 'inline'
}, opts, options)
return s3.upload(params, function (err, data) {
if (err) return reject(err)
return resolve(data)
})
})
}