Isaiah Odhner
parent
dace1f59b7
commit
96ad657bf9
425
lib/FileSaver.js
425
lib/FileSaver.js
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@ -1,253 +1,188 @@
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/* FileSaver.js
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* A saveAs() FileSaver implementation.
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* 2015-05-07.2
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*
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* By Eli Grey, http://eligrey.com
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* License: X11/MIT
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* See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
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*/
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(function (global, factory) {
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if (typeof define === "function" && define.amd) {
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define([], factory);
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} else if (typeof exports !== "undefined") {
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factory();
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} else {
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var mod = {
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exports: {}
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};
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factory();
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global.FileSaver = mod.exports;
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}
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})(this, function () {
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"use strict";
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/*global self */
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/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
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/*
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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 environments
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// https://stackoverflow.com/q/3277182/1008999
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var _global = typeof window === 'object' && window.window === window ? window : typeof self === 'object' && self.self === self ? self : typeof global === 'object' && global.global === global ? global : void 0;
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/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
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function bom(blob, opts) {
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if (typeof opts === 'undefined') opts = {
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autoBom: false
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};else if (typeof opts !== 'object') {
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console.warn('Deprecated: Expected third argument to be a object');
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opts = {
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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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var saveAs = saveAs || (function(view) {
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"use strict";
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// IE <10 is explicitly unsupported
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if (typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
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return;
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}
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var
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doc = view.document
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// only get URL when necessary in case Blob.js hasn't overridden it yet
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, get_URL = function() {
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return view.URL || view.webkitURL || view;
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}
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, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
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, can_use_save_link = "download" in save_link
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, click = function(node) {
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var event = doc.createEvent("MouseEvents");
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event.initMouseEvent(
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"click", true, false, view, 0, 0, 0, 0, 0
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, false, false, false, false, 0, null
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);
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node.dispatchEvent(event);
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}
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, webkit_req_fs = view.webkitRequestFileSystem
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, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
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, throw_outside = function(ex) {
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(view.setImmediate || view.setTimeout)(function() {
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throw ex;
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}, 0);
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}
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, force_saveable_type = "application/octet-stream"
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, fs_min_size = 0
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// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
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// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
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// for the reasoning behind the timeout and revocation flow
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, arbitrary_revoke_timeout = 500 // in ms
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, revoke = function(file) {
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var revoker = function() {
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if (typeof file === "string") { // file is an object URL
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get_URL().revokeObjectURL(file);
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} else { // file is a File
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file.remove();
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}
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};
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if (view.chrome) {
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revoker();
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} else {
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setTimeout(revoker, arbitrary_revoke_timeout);
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}
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}
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, dispatch = function(filesaver, event_types, event) {
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event_types = [].concat(event_types);
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var i = event_types.length;
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while (i--) {
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var listener = filesaver["on" + event_types[i]];
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if (typeof listener === "function") {
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try {
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listener.call(filesaver, event || filesaver);
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} catch (ex) {
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throw_outside(ex);
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}
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}
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}
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}
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, auto_bom = function(blob) {
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// prepend BOM for UTF-8 XML and text/* types (including HTML)
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if (/^\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(["\ufeff", blob], {type: blob.type});
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}
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return blob;
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}
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, FileSaver = function(blob, name) {
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blob = auto_bom(blob);
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// First try a.download, then web filesystem, then object URLs
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var
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filesaver = this
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, type = blob.type
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, blob_changed = false
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, object_url
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, target_view
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, dispatch_all = function() {
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dispatch(filesaver, "writestart progress write writeend".split(" "));
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}
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// on any filesys errors revert to saving with object URLs
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, fs_error = function() {
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// don't create more object URLs than needed
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if (blob_changed || !object_url) {
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object_url = get_URL().createObjectURL(blob);
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}
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if (target_view) {
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target_view.location.href = object_url;
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} else {
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var new_tab = view.open(object_url, "_blank");
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if (new_tab == undefined && typeof safari !== "undefined") {
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//Apple do not allow window.open, see http://bit.ly/1kZffRI
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view.location.href = object_url
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}
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}
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filesaver.readyState = filesaver.DONE;
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dispatch_all();
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revoke(object_url);
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}
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, abortable = function(func) {
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return function() {
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if (filesaver.readyState !== filesaver.DONE) {
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return func.apply(this, arguments);
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}
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};
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}
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, create_if_not_found = {create: true, exclusive: false}
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, slice
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;
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filesaver.readyState = filesaver.INIT;
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if (!name) {
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name = "download";
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}
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if (can_use_save_link) {
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object_url = get_URL().createObjectURL(blob);
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save_link.href = object_url;
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save_link.download = name;
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click(save_link);
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filesaver.readyState = filesaver.DONE;
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dispatch_all();
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revoke(object_url);
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return;
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}
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// Object and web filesystem URLs have a problem saving in Google Chrome when
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// viewed in a tab, so I force save with application/octet-stream
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// http://code.google.com/p/chromium/issues/detail?id=91158
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// Update: Google errantly closed 91158, I submitted it again:
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// https://code.google.com/p/chromium/issues/detail?id=389642
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if (view.chrome && type && type !== force_saveable_type) {
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slice = blob.slice || blob.webkitSlice;
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blob = slice.call(blob, 0, blob.size, force_saveable_type);
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blob_changed = true;
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}
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// Since I can't be sure that the guessed media type will trigger a download
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// in WebKit, I append .download to the filename.
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// https://bugs.webkit.org/show_bug.cgi?id=65440
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if (webkit_req_fs && name !== "download") {
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name += ".download";
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}
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if (type === force_saveable_type || webkit_req_fs) {
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target_view = view;
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}
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if (!req_fs) {
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fs_error();
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return;
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}
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fs_min_size += blob.size;
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req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
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fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
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var save = function() {
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dir.getFile(name, create_if_not_found, abortable(function(file) {
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file.createWriter(abortable(function(writer) {
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writer.onwriteend = function(event) {
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target_view.location.href = file.toURL();
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filesaver.readyState = filesaver.DONE;
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dispatch(filesaver, "writeend", event);
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revoke(file);
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};
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writer.onerror = function() {
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var error = writer.error;
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if (error.code !== error.ABORT_ERR) {
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fs_error();
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}
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};
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"writestart progress write abort".split(" ").forEach(function(event) {
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writer["on" + event] = filesaver["on" + event];
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});
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writer.write(blob);
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filesaver.abort = function() {
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writer.abort();
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filesaver.readyState = filesaver.DONE;
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};
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filesaver.readyState = filesaver.WRITING;
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}), fs_error);
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}), fs_error);
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};
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dir.getFile(name, {create: false}, abortable(function(file) {
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// delete file if it already exists
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file.remove();
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save();
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}), abortable(function(ex) {
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if (ex.code === ex.NOT_FOUND_ERR) {
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save();
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} else {
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fs_error();
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}
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}));
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}), fs_error);
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}), fs_error);
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}
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, FS_proto = FileSaver.prototype
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, saveAs = function(blob, name) {
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return new FileSaver(blob, name);
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}
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;
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// IE 10+ (native saveAs)
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if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
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return function(blob, name) {
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return navigator.msSaveOrOpenBlob(auto_bom(blob), name);
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};
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}
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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], {
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type: blob.type
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});
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}
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FS_proto.abort = function() {
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var filesaver = this;
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filesaver.readyState = filesaver.DONE;
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dispatch(filesaver, "abort");
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};
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FS_proto.readyState = FS_proto.INIT = 0;
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FS_proto.WRITING = 1;
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FS_proto.DONE = 2;
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return blob;
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}
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FS_proto.error =
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FS_proto.onwritestart =
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FS_proto.onprogress =
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FS_proto.onwrite =
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FS_proto.onabort =
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FS_proto.onerror =
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FS_proto.onwriteend =
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null;
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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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return saveAs;
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}(
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typeof self !== "undefined" && self
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|| typeof window !== "undefined" && window
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|| this.content
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));
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// `self` is undefined in Firefox for Android content script context
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// while `this` is nsIContentFrameMessageManager
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// with an attribute `content` that corresponds to the window
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xhr.onload = function () {
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saveAs(xhr.response, name, opts);
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};
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if (typeof module !== "undefined" && module.exports) {
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module.exports.saveAs = saveAs;
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} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
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define([], function() {
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return saveAs;
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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(); // use sync to avoid popup blocker
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xhr.open('HEAD', url, false);
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try {
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xhr.send();
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} catch (e) {}
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return xhr.status >= 200 && xhr.status <= 299;
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} // `a.click()` doesn'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, 20, false, false, false, false, 0, null);
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node.dispatchEvent(evt);
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}
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} // Detect WebView inside a native macOS app by ruling out all browsers
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// We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
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// https://www.whatismybrowser.com/guides/the-latest-user-agent/macos
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var isMacOSWebView = /Macintosh/.test(navigator.userAgent) && /AppleWebKit/.test(navigator.userAgent) && !/Safari/.test(navigator.userAgent);
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var saveAs = _global.saveAs || ( // probably in some web worker
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typeof window !== 'object' || window !== _global ? function saveAs() {}
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/* noop */
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// Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
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: 'download' in HTMLAnchorElement.prototype && !isMacOSWebView ? 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) ? download(blob, name, opts) : 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 () {
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URL.revokeObjectURL(a.href);
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}, 4E4); // 40s
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setTimeout(function () {
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click(a);
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}, 0);
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}
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} // Use msSaveOrOpenBlob as a second approach
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: 'msSaveOrOpenBlob' in navigator ? 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 () {
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click(a);
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});
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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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} // 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 available 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 = 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 || isMacOSWebView) && typeof FileReader !== 'undefined') {
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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;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;else location.href = url;
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popup = null; // reverse-tabnabbing #460
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setTimeout(function () {
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URL.revokeObjectURL(url);
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}, 4E4); // 40s
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}
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});
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}
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_global.saveAs = saveAs.saveAs = saveAs;
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if (typeof module !== 'undefined') {
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module.exports = saveAs;
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}
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});
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