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moon assets js uploaders s3.js
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assets/js/uploaders/s3.js

export default function(entries, onViewError){
entries.forEach(entry => {
let formData = new FormData()
let {url, fields} = entry.meta
Object.entries(fields).forEach(([key, val]) => formData.append(key, val))
formData.append("file", entry.file)
let xhr = new XMLHttpRequest()
onViewError(() => xhr.abort())
xhr.onload = () => xhr.status === 204 ? entry.progress(100) : entry.error()
xhr.onerror = () => entry.error()
xhr.upload.addEventListener("progress", (event) => {
if(event.lengthComputable){
let percent = Math.round((event.loaded / event.total) * 100)
if(percent < 100){ entry.progress(percent) }
}
})
xhr.open("POST", url, true)
xhr.send(formData)
})
}