https://smartrack.live/lib/file-saver/FileSaver.js

1/* FileSaver.js
2 * A saveAs() FileSaver implementation.
3 * 1.3.2
4 * 2016-06-16 18:25:19
5 *
6 * By Eli Grey, http://eligrey.com
7 * License: MIT
8 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
9 */
10
11/*global self */
12/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
13
14/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
15
16var saveAs = saveAs || (function(view) {
17	"use strict";
18	// IE <10 is explicitly unsupported
19	if (typeof view === "undefined" || typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
20		return;
21	}
22	var
23		  doc = view.document
24		  // only get URL when necessary in case Blob.js hasn't overridden it yet
25		, get_URL = function() {
26			return view.URL || view.webkitURL || view;
27		}
28		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
29		, can_use_save_link = "download" in save_link
30		, click = function(node) {
31			var event = new MouseEvent("click");
32			node.dispatchEvent(event);
33		}
34		, is_safari = /constructor/i.test(view.HTMLElement) || view.safari
35		, is_chrome_ios =/CriOS\/[\d]+/.test(navigator.userAgent)
36		, throw_outside = function(ex) {
37			(view.setImmediate || view.setTimeout)(function() {
38				throw ex;
39			}, 0);
40		}
41		, force_saveable_type = "application/octet-stream"
42		// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
43		, arbitrary_revoke_timeout = 1000 * 40 // in ms
44		, revoke = function(file) {
45			var revoker = function() {
46				if (typeof file === "string") { // file is an object URL
47					get_URL().revokeObjectURL(file);
48				} else { // file is a File
49					file.remove();
50				}
51			};
52			setTimeout(revoker, arbitrary_revoke_timeout);
53		}
54		, dispatch = function(filesaver, event_types, event) {
55			event_types = [].concat(event_types);
56			var i = event_types.length;
57			while (i--) {
58				var listener = filesaver["on" + event_types[i]];
59				if (typeof listener === "function") {
60					try {
61						listener.call(filesaver, event || filesaver);
62					} catch (ex) {
63						throw_outside(ex);
64					}
65				}
66			}
67		}
68		, auto_bom = function(blob) {
69			// prepend BOM for UTF-8 XML and text/* types (including HTML)
70			// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
71			if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
72				return new Blob([String.fromCharCode(0xFEFF), blob], {type: blob.type});
73			}
74			return blob;
75		}
76		, FileSaver = function(blob, name, no_auto_bom) {
77			if (!no_auto_bom) {
78				blob = auto_bom(blob);
79			}
80			// First try a.download, then web filesystem, then object URLs
81			var
82				  filesaver = this
83				, type = blob.type
84				, force = type === force_saveable_type
85				, object_url
86				, dispatch_all = function() {
87					dispatch(filesaver, "writestart progress write writeend".split(" "));
88				}
89				// on any filesys errors revert to saving with object URLs
90				, fs_error = function() {
91					if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {
92						// Safari doesn't allow downloading of blob urls
93						var reader = new FileReader();
94						reader.onloadend = function() {
95							var url = is_chrome_ios ? reader.result : reader.result.replace(/^data:[^;]*;/, 'data:attachment/file;');
96							var popup = view.open(url, '_blank');
97							if(!popup) view.location.href = url;
98							url=undefined; // release reference before dispatching
99							filesaver.readyState = filesaver.DONE;
100							dispatch_all();
101						};
102						reader.readAsDataURL(blob);
103						filesaver.readyState = filesaver.INIT;
104						return;
105					}
106					// don't create more object URLs than needed
107					if (!object_url) {
108						object_url = get_URL().createObjectURL(blob);
109					}
110					if (force) {
111						view.location.href = object_url;
112					} else {
113						var opened = view.open(object_url, "_blank");
114						if (!opened) {
115							// Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
116							view.location.href = object_url;
117						}
118					}
119					filesaver.readyState = filesaver.DONE;
120					dispatch_all();
121					revoke(object_url);
122				}
123			;
124			filesaver.readyState = filesaver.INIT;
125
126			if (can_use_save_link) {
127				object_url = get_URL().createObjectURL(blob);
128				setTimeout(function() {
129					save_link.href = object_url;