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175 lines
5.2 KiB
175 lines
5.2 KiB
/*
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* FileSaver.js
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* A saveAs() FileSaver implementation.
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*
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* By Eli Grey, http://eligrey.com
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*
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* License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
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* source : http://purl.eligrey.com/github/FileSaver.js
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*/
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// The one and only way of getting global scope in all enviorment
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// https://stackoverflow.com/q/3277182/1008999
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var _global = (function () {
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// some use content security policy to disable eval
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try {
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return Function('return this')() || (42, eval)('this')
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} catch (e) {
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// every global should have circular reference
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// used for checking if someone writes var window = {}; var self = {}
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return typeof window === 'object' && window.window === window ? window
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: typeof self === 'object' && self.self === self ? self
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: typeof global === 'object' && global.global === global ? global : this
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}
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})()
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function bom (blob, opts) {
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if (typeof opts === 'undefined') opts = { autoBom: false }
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else if (typeof opts !== 'object') {
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console.warn('Depricated: Expected third argument to be a object')
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opts = { autoBom: !opts }
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}
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// prepend BOM for UTF-8 XML and text/* types (including HTML)
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// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
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if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
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return new Blob([String.fromCharCode(0xFEFF), blob], { type: blob.type })
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}
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return blob
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}
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function download (url, name, opts) {
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var xhr = new XMLHttpRequest()
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xhr.open('GET', url)
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xhr.responseType = 'blob'
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xhr.onload = function () {
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saveAs(xhr.response, name, opts)
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}
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xhr.onerror = function () {
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console.error('could not download file')
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}
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xhr.send()
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}
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function corsEnabled (url) {
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var xhr = new XMLHttpRequest()
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// use sync to avoid popup blocker
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xhr.open('HEAD', url, false)
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xhr.send()
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return xhr.status >= 200 && xhr.status <= 299
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}
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// `a.click()` don't work for all browsers (#465)
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function click(node) {
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try {
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node.dispatchEvent(new MouseEvent('click'))
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} catch (e) {
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var evt = document.createEvent('MouseEvents')
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evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80,
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20, false, false, false, false, 0, null)
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node.dispatchEvent(evt)
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}
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}
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var saveAs = _global.saveAs ||
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// probably in some web worker
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(typeof window !== 'object' || window !== _global)
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? function saveAs () { /* noop */ }
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// Use download attribute first if possible (#193 Lumia mobile)
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: 'download' in HTMLAnchorElement.prototype
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? function saveAs (blob, name, opts) {
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var URL = _global.URL || _global.webkitURL
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var a = document.createElement('a')
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name = name || blob.name || 'download'
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a.download = name
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a.rel = 'noopener' // tabnabbing
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// TODO: detect chrome extensions & packaged apps
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// a.target = '_blank'
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if (typeof blob === 'string') {
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// Support regular links
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a.href = blob
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if (a.origin !== location.origin) {
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corsEnabled(a.href)
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? download(blob, name, opts)
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: click(a, a.target = '_blank')
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} else {
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click(a)
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}
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} else {
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// Support blobs
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a.href = URL.createObjectURL(blob)
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setTimeout(function () { URL.revokeObjectURL(a.href) }, 4E4) // 40s
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setTimeout(function () { click(a) }, 0)
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}
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}
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// Use msSaveOrOpenBlob as a second approch
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: 'msSaveOrOpenBlob' in navigator
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? function saveAs (blob, name, opts) {
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name = name || blob.name || 'download'
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if (typeof blob === 'string') {
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if (corsEnabled(blob)) {
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download(blob, name, opts)
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} else {
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var a = document.createElement('a')
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a.href = blob
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a.target = '_blank'
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setTimeout(function () { click(a) })
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}
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} else {
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navigator.msSaveOrOpenBlob(bom(blob, opts), name)
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}
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}
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// Fallback to using FileReader and a popup
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: function saveAs (blob, name, opts, popup) {
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// Open a popup immediately do go around popup blocker
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// Mostly only avalible on user interaction and the fileReader is async so...
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popup = popup || open('', '_blank')
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if (popup) {
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popup.document.title =
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popup.document.body.innerText = 'downloading...'
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}
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if (typeof blob === 'string') return download(blob, name, opts)
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var force = blob.type === 'application/octet-stream'
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var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari
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var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent)
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if ((isChromeIOS || (force && isSafari)) && typeof FileReader === 'object') {
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// Safari doesn't allow downloading of blob urls
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var reader = new FileReader()
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reader.onloadend = function () {
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var url = reader.result
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url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, 'data:attachment/file;')
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if (popup) popup.location.href = url
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else location = url
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popup = null // reverse-tabnabbing #460
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}
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reader.readAsDataURL(blob)
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} else {
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var URL = _global.URL || _global.webkitURL
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var url = URL.createObjectURL(blob)
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if (popup) popup.location = url
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else location.href = url
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popup = null // reverse-tabnabbing #460
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setTimeout(function () { URL.revokeObjectURL(url) }, 4E4) // 40s
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}
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}
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//module.exports = _global.saveAs = saveAs.saveAs = saveAs
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define(function () {
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var FileSaver = {};
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FileSaver.saveAs = saveAs;
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return FileSaver;
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});
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