From 62d219a0fac54b94cd4f230e7bfc55aa3f8dcfa4 Mon Sep 17 00:00:00 2001
From: Eli Grey <~@eligrey.com>
Date: Mon, 28 Mar 2016 16:07:08 -0400
Subject: [PATCH] Semi-workaround for #205

This solution still isn't technically correct because it could take more
than 40 seconds to download a file. I could simply not revoke any files,
but then users would run into issues once they have saved a cumulative
total of over 500MB (
https://bugs.chromium.org/p/chromium/issues/detail?id=375297 )

Complain to @sicking and @arunranga for creating and standardizing an
incomplete revocation API.
---
 FileSaver.js     | 28 +++++++++++++++++++---------
 FileSaver.min.js |  2 +-
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/FileSaver.js b/FileSaver.js
index b76f8fb..fd5927d 100644
--- a/FileSaver.js
+++ b/FileSaver.js
@@ -1,6 +1,6 @@
 /* FileSaver.js
  * A saveAs() FileSaver implementation.
- * 1.1.20160319
+ * 1.1.20160328
  *
  * By Eli Grey, http://eligrey.com
  * License: MIT
@@ -40,10 +40,8 @@ var saveAs = saveAs || (function(view) {
 		}
 		, force_saveable_type = "application/octet-stream"
 		, fs_min_size = 0
-		// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
-		// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
-		// for the reasoning behind the timeout and revocation flow
-		, arbitrary_revoke_timeout = 500 // in ms
+		// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
+		, arbitrary_revoke_timeout = 1000 * 40 // in ms
 		, revoke = function(file) {
 			var revoker = function() {
 				if (typeof file === "string") { // file is an object URL
@@ -52,11 +50,23 @@ var saveAs = saveAs || (function(view) {
 					file.remove();
 				}
 			};
-			if (view.chrome) {
-				revoker();
-			} else {
-				setTimeout(revoker, arbitrary_revoke_timeout);
+			/* // Take note W3C:
+			var
+			  uri = typeof file === "string" ? file : file.toURL()
+			, revoker = function(evt) {
+				// idealy DownloadFinishedEvent.data would be the URL requested
+				if (evt.data === uri) {
+					if (typeof file === "string") { // file is an object URL
+						get_URL().revokeObjectURL(file);
+					} else { // file is a File
+						file.remove();
+					}
+				}
 			}
+			;
+			view.addEventListener("downloadfinished", revoker);
+			*/
+			setTimeout(revoker, arbitrary_revoke_timeout);
 		}
 		, dispatch = function(filesaver, event_types, event) {
 			event_types = [].concat(event_types);
diff --git a/FileSaver.min.js b/FileSaver.min.js
index eb062f2..6268ec9 100644
--- a/FileSaver.min.js
+++ b/FileSaver.min.js
@@ -1,2 +1,2 @@
 /*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
-var saveAs=saveAs||function(view){"use strict";if(typeof navigator!=="undefined"&&/MSIE [1-9]\./.test(navigator.userAgent)){return}var doc=view.document,get_URL=function(){return view.URL||view.webkitURL||view},save_link=doc.createElementNS("http://www.w3.org/1999/xhtml","a"),can_use_save_link="download"in save_link,click=function(node){var event=new MouseEvent("click");node.dispatchEvent(event)},is_safari=/Version\/[\d\.]+.*Safari/.test(navigator.userAgent),webkit_req_fs=view.webkitRequestFileSystem,req_fs=view.requestFileSystem||webkit_req_fs||view.mozRequestFileSystem,throw_outside=function(ex){(view.setImmediate||view.setTimeout)(function(){throw ex},0)},force_saveable_type="application/octet-stream",fs_min_size=0,arbitrary_revoke_timeout=500,revoke=function(file){var revoker=function(){if(typeof file==="string"){get_URL().revokeObjectURL(file)}else{file.remove()}};if(view.chrome){revoker()}else{setTimeout(revoker,arbitrary_revoke_timeout)}},dispatch=function(filesaver,event_types,event){event_types=[].concat(event_types);var i=event_types.length;while(i--){var listener=filesaver["on"+event_types[i]];if(typeof listener==="function"){try{listener.call(filesaver,event||filesaver)}catch(ex){throw_outside(ex)}}}},auto_bom=function(blob){if(/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)){return new Blob(["\ufeff",blob],{type:blob.type})}return blob},FileSaver=function(blob,name,no_auto_bom){if(!no_auto_bom){blob=auto_bom(blob)}var filesaver=this,type=blob.type,blob_changed=false,object_url,target_view,dispatch_all=function(){dispatch(filesaver,"writestart progress write writeend".split(" "))},fs_error=function(){if(target_view&&is_safari&&typeof FileReader!=="undefined"){var reader=new FileReader;reader.onloadend=function(){var base64Data=reader.result;target_view.location.href="data:attachment/file"+base64Data.slice(base64Data.search(/[,;]/));filesaver.readyState=filesaver.DONE;dispatch_all()};reader.readAsDataURL(blob);filesaver.readyState=filesaver.INIT;return}if(blob_changed||!object_url){object_url=get_URL().createObjectURL(blob)}if(target_view){target_view.location.href=object_url}else{var new_tab=view.open(object_url,"_blank");if(new_tab==undefined&&is_safari){view.location.href=object_url}}filesaver.readyState=filesaver.DONE;dispatch_all();revoke(object_url)},abortable=function(func){return function(){if(filesaver.readyState!==filesaver.DONE){return func.apply(this,arguments)}}},create_if_not_found={create:true,exclusive:false},slice;filesaver.readyState=filesaver.INIT;if(!name){name="download"}if(can_use_save_link){object_url=get_URL().createObjectURL(blob);setTimeout(function(){save_link.href=object_url;save_link.download=name;click(save_link);dispatch_all();revoke(object_url);filesaver.readyState=filesaver.DONE});return}if(view.chrome&&type&&type!==force_saveable_type){slice=blob.slice||blob.webkitSlice;blob=slice.call(blob,0,blob.size,force_saveable_type);blob_changed=true}if(webkit_req_fs&&name!=="download"){name+=".download"}if(type===force_saveable_type||webkit_req_fs){target_view=view}if(!req_fs){fs_error();return}fs_min_size+=blob.size;req_fs(view.TEMPORARY,fs_min_size,abortable(function(fs){fs.root.getDirectory("saved",create_if_not_found,abortable(function(dir){var save=function(){dir.getFile(name,create_if_not_found,abortable(function(file){file.createWriter(abortable(function(writer){writer.onwriteend=function(event){target_view.location.href=file.toURL();filesaver.readyState=filesaver.DONE;dispatch(filesaver,"writeend",event);revoke(file)};writer.onerror=function(){var error=writer.error;if(error.code!==error.ABORT_ERR){fs_error()}};"writestart progress write abort".split(" ").forEach(function(event){writer["on"+event]=filesaver["on"+event]});writer.write(blob);filesaver.abort=function(){writer.abort();filesaver.readyState=filesaver.DONE};filesaver.readyState=filesaver.WRITING}),fs_error)}),fs_error)};dir.getFile(name,{create:false},abortable(function(file){file.remove();save()}),abortable(function(ex){if(ex.code===ex.NOT_FOUND_ERR){save()}else{fs_error()}}))}),fs_error)}),fs_error)},FS_proto=FileSaver.prototype,saveAs=function(blob,name,no_auto_bom){return new FileSaver(blob,name,no_auto_bom)};if(typeof navigator!=="undefined"&&navigator.msSaveOrOpenBlob){return function(blob,name,no_auto_bom){if(!no_auto_bom){blob=auto_bom(blob)}return navigator.msSaveOrOpenBlob(blob,name||"download")}}FS_proto.abort=function(){var filesaver=this;filesaver.readyState=filesaver.DONE;dispatch(filesaver,"abort")};FS_proto.readyState=FS_proto.INIT=0;FS_proto.WRITING=1;FS_proto.DONE=2;FS_proto.error=FS_proto.onwritestart=FS_proto.onprogress=FS_proto.onwrite=FS_proto.onabort=FS_proto.onerror=FS_proto.onwriteend=null;return saveAs}(typeof self!=="undefined"&&self||typeof window!=="undefined"&&window||this.content);if(typeof module!=="undefined"&&module.exports){module.exports.saveAs=saveAs}else if(typeof define!=="undefined"&&define!==null&&define.amd!=null){define([],function(){return saveAs})}
+var saveAs=saveAs||function(e){"use strict";if("undefined"==typeof navigator||!/MSIE [1-9]\./.test(navigator.userAgent)){var t=e.document,n=function(){return e.URL||e.webkitURL||e},o=t.createElementNS("http://www.w3.org/1999/xhtml","a"),r="download"in o,i=function(e){var t=new MouseEvent("click");e.dispatchEvent(t)},a=/Version\/[\d\.]+.*Safari/.test(navigator.userAgent),c=e.webkitRequestFileSystem,f=e.requestFileSystem||c||e.mozRequestFileSystem,u=function(t){(e.setImmediate||e.setTimeout)(function(){throw t},0)},d="application/octet-stream",s=0,l=4e4,v=function(e){var t=function(){"string"==typeof e?n().revokeObjectURL(e):e.remove()};setTimeout(t,l)},p=function(e,t,n){t=[].concat(t);for(var o=t.length;o--;){var r=e["on"+t[o]];if("function"==typeof r)try{r.call(e,n||e)}catch(i){u(i)}}},w=function(e){return/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(e.type)?new Blob(["\ufeff",e],{type:e.type}):e},y=function(t,u,l){l||(t=w(t));var y,m,S,h=this,R=t.type,O=!1,g=function(){p(h,"writestart progress write writeend".split(" "))},b=function(){if(m&&a&&"undefined"!=typeof FileReader){var o=new FileReader;return o.onloadend=function(){var e=o.result;m.location.href="data:attachment/file"+e.slice(e.search(/[,;]/)),h.readyState=h.DONE,g()},o.readAsDataURL(t),void(h.readyState=h.INIT)}if((O||!y)&&(y=n().createObjectURL(t)),m)m.location.href=y;else{var r=e.open(y,"_blank");void 0===r&&a&&(e.location.href=y)}h.readyState=h.DONE,g(),v(y)},E=function(e){return function(){return h.readyState!==h.DONE?e.apply(this,arguments):void 0}},N={create:!0,exclusive:!1};return h.readyState=h.INIT,u||(u="download"),r?(y=n().createObjectURL(t),void setTimeout(function(){o.href=y,o.download=u,i(o),g(),v(y),h.readyState=h.DONE})):(e.chrome&&R&&R!==d&&(S=t.slice||t.webkitSlice,t=S.call(t,0,t.size,d),O=!0),c&&"download"!==u&&(u+=".download"),(R===d||c)&&(m=e),f?(s+=t.size,void f(e.TEMPORARY,s,E(function(e){e.root.getDirectory("saved",N,E(function(e){var n=function(){e.getFile(u,N,E(function(e){e.createWriter(E(function(n){n.onwriteend=function(t){m.location.href=e.toURL(),h.readyState=h.DONE,p(h,"writeend",t),v(e)},n.onerror=function(){var e=n.error;e.code!==e.ABORT_ERR&&b()},"writestart progress write abort".split(" ").forEach(function(e){n["on"+e]=h["on"+e]}),n.write(t),h.abort=function(){n.abort(),h.readyState=h.DONE},h.readyState=h.WRITING}),b)}),b)};e.getFile(u,{create:!1},E(function(e){e.remove(),n()}),E(function(e){e.code===e.NOT_FOUND_ERR?n():b()}))}),b)}),b)):void b())},m=y.prototype,S=function(e,t,n){return new y(e,t,n)};return"undefined"!=typeof navigator&&navigator.msSaveOrOpenBlob?function(e,t,n){return n||(e=w(e)),navigator.msSaveOrOpenBlob(e,t||"download")}:(m.abort=function(){var e=this;e.readyState=e.DONE,p(e,"abort")},m.readyState=m.INIT=0,m.WRITING=1,m.DONE=2,m.error=m.onwritestart=m.onprogress=m.onwrite=m.onabort=m.onerror=m.onwriteend=null,S)}}("undefined"!=typeof self&&self||"undefined"!=typeof window&&window||this.content);"undefined"!=typeof module&&module.exports?module.exports.saveAs=saveAs:"undefined"!=typeof define&&null!==define&&null!==define.amd&&define([],function(){return saveAs});
\ No newline at end of file