https://gpblocks.org/run/FileSaver.js

1/* FileSaver.js
2 * A saveAs() FileSaver implementation.
3 * 1.1.20151003
4 *
5 * By Eli Grey, http://eligrey.com
6 * License: MIT
7 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
8 */
9
10/*global self */
11/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
12
13/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
14
15var saveAs = saveAs || (function(view) {
16	"use strict";
17	// IE <10 is explicitly unsupported
18	if (typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
19		return;
20	}
21	var
22		  doc = view.document
23		  // only get URL when necessary in case Blob.js hasn't overridden it yet
24		, get_URL = function() {
25			return view.URL || view.webkitURL || view;
26		}
27		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
28		, can_use_save_link = "download" in save_link
29		, click = function(node) {
30			var event = new MouseEvent("click");
31			node.dispatchEvent(event);
32		}
33		, is_safari = /Version\/[\d\.]+.*Safari/.test(navigator.userAgent)
34		, webkit_req_fs = view.webkitRequestFileSystem
35		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
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		, fs_min_size = 0
43		// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
44		// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
45		// for the reasoning behind the timeout and revocation flow
46		, arbitrary_revoke_timeout = 500 // in ms
47		, revoke = function(file) {
48			var revoker = function() {
49				if (typeof file === "string") { // file is an object URL
50					get_URL().revokeObjectURL(file);
51				} else { // file is a File
52					file.remove();
53				}
54			};
55			if (view.chrome) {
56				revoker();
57			} else {
58				setTimeout(revoker, arbitrary_revoke_timeout);
59			}
60		}
61		, dispatch = function(filesaver, event_types, event) {
62			event_types = [].concat(event_types);
63			var i = event_types.length;
64			while (i--) {
65				var listener = filesaver["on" + event_types[i]];
66				if (typeof listener === "function") {
67					try {
68						listener.call(filesaver, event || filesaver);
69					} catch (ex) {
70						throw_outside(ex);
71					}
72				}
73			}
74		}
75		, auto_bom = function(blob) {
76			// prepend BOM for UTF-8 XML and text/* types (including HTML)
77			if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
78				return new Blob(["\ufeff", blob], {type: blob.type});
79			}
80			return blob;
81		}
82		, FileSaver = function(blob, name, no_auto_bom) {
83			if (!no_auto_bom) {
84				blob = auto_bom(blob);
85			}
86			// First try a.download, then web filesystem, then object URLs
87			var
88				  filesaver = this
89				, type = blob.type
90				, blob_changed = false
91				, object_url
92				, target_view
93				, dispatch_all = function() {
94					dispatch(filesaver, "writestart progress write writeend".split(" "));
95				}
96				// on any filesys errors revert to saving with object URLs
97				, fs_error = function() {
98					if (target_view && is_safari && typeof FileReader !== "undefined") {
99						// Safari doesn't allow downloading of blob urls
100						var reader = new FileReader();
101						reader.onloadend = function() {
102							var base64Data = reader.result;
103							target_view.location.href = "data:attachment/file" + base64Data.slice(base64Data.search(/[,;]/));
104							filesaver.readyState = filesaver.DONE;
105							dispatch_all();
106						};
107						reader.readAsDataURL(blob);
108						filesaver.readyState = filesaver.INIT;
109						return;
110					}
111					// don't create more object URLs than needed
112					if (blob_changed || !object_url) {
113						object_url = get_URL().createObjectURL(blob);
114					}
115					if (target_view) {
116						target_view.location.href = object_url;
117					} else {
118						var new_tab = view.open(object_url, "_blank");
119						if (new_tab == undefined && is_safari) {
120							//Apple do not allow window.open, see http://bit.ly/1kZffRI
121							view.location.href = object_url
122						}
123					}
124					filesaver.readyState = filesaver.DONE;
125					dispatch_all();
126					revoke(object_url);
127				}
128				, abortable = function(func) {
129					return function() {
130						if (filesaver.readyState !== filesaver.DONE) {
131							return func.apply(this, arguments);
132						}
133					};
134				}
135				, create_if_not_found = {create: true, exclusive: false}
136				, slice
137			;
138			filesaver.readyState = filesaver.INIT;
139			if (!name) {
140				name = "download";
141			}
142			if (can_use_save_link) {
143				object_url = get_URL().createObjectURL(blob);
144				setTimeout(function() {
145					save_link.href = object_url;

146					save_link.download = name;
147					click(save_link);
148					dispatch_all();
149					revoke(object_url);
150					filesaver.readyState = filesaver.DONE;
151				});
152				return;
153			}
154			// Object and web filesystem URLs have a problem saving in Google Chrome when
155			// viewed in a tab, so I force save with application/octet-stream
156			// http://code.google.com/p/chromium/issues/detail?id=91158
157			// Update: Google errantly closed 91158, I submitted it again:
158			// https://code.google.com/p/chromium/issues/detail?id=389642
159			if (view.chrome && type && type !== force_saveable_type) {
160				slice = blob.slice || blob.webkitSlice;
161				blob = slice.call(blob, 0, blob.size, force_saveable_type);
162				blob_changed = true;
163			}
164			// Since I can't be sure that the guessed media type will trigger a download
165			// in WebKit, I append .download to the filename.
166			// https://bugs.webkit.org/show_bug.cgi?id=65440
167			if (webkit_req_fs && name !== "download") {
168				name += ".download";
169			}
170			if (type === force_saveable_type || webkit_req_fs) {
171				target_view = view;
172			}
173			if (!req_fs) {
174				fs_error();
175				return;
176			}
177			fs_min_size += blob.size;
178			req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
179				fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
180					var save = function() {
181						dir.getFile(name, create_if_not_found, abortable(function(file) {
182							file.createWriter(abortable(function(writer) {
183								writer.onwriteend = function(event) {
184									target_view.location.href = file.toURL();
185									filesaver.readyState = filesaver.DONE;
186									dispatch(filesaver, "writeend", event);
187									revoke(file);
188								};
189								writer.onerror = function() {
190									var error = writer.error;
191									if (error.code !== error.ABORT_ERR) {
192										fs_error();
193									}
194								};
195								"writestart progress write abort".split(" ").forEach(function(event) {
196									writer["on" + event] = filesaver["on" + event];
197								});
198								writer.write(blob);
199								filesaver.abort = function() {
200									writer.abort();
201									filesaver.readyState = filesaver.DONE;
202								};
203								filesaver.readyState = filesaver.WRITING;
204							}), fs_error);
205						}), fs_error);
206					};
207					dir.getFile(name, {create: false}, abortable(function(file) {
208						// delete file if it already exists
209						file.remove();
210						save();
211					}), abortable(function(ex) {
212						if (ex.code === ex.NOT_FOUND_ERR) {
213							save();
214						} else {
215							fs_error();
216						}
217					}));
218				}), fs_error);
219			}), fs_error);
220		}
221		, FS_proto = FileSaver.prototype
222		, saveAs = function(blob, name, no_auto_bom) {
223			return new FileSaver(blob, name, no_auto_bom);
224		}
225	;
226	// IE 10+ (native saveAs)
227	if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
228		return function(blob, name, no_auto_bom) {
229			if (!no_auto_bom) {
230				blob = auto_bom(blob);
231			}
232			return navigator.msSaveOrOpenBlob(blob, name || "download");
233		};
234	}
235
236	FS_proto.abort = function() {
237		var filesaver = this;
238		filesaver.readyState = filesaver.DONE;
239		dispatch(filesaver, "abort");
240	};
241	FS_proto.readyState = FS_proto.INIT = 0;
242	FS_proto.WRITING = 1;
243	FS_proto.DONE = 2;
244
245	FS_proto.error =
246	FS_proto.onwritestart =
247	FS_proto.onprogress =
248	FS_proto.onwrite =
249	FS_proto.onabort =
250	FS_proto.onerror =
251	FS_proto.onwriteend =
252		null;
253
254	return saveAs;
255}(
256	   typeof self !== "undefined" && self
257	|| typeof window !== "undefined" && window
258	|| this.content
259));
260// `self` is undefined in Firefox for Android content script context
261// while `this` is nsIContentFrameMessageManager
262// with an attribute `content` that corresponds to the window
263
264if (typeof module !== "undefined" && module.exports) {
265  module.exports.saveAs = saveAs;
266} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
267  define([], function() {
268    return saveAs;
269  });
270}