| 1 |
/* FileSaver.js |
| 2 |
* A saveAs() FileSaver implementation. |
| 3 |
* 2013-01-23 |
| 4 |
* |
| 5 |
* By Eli Grey, http://eligrey.com |
| 6 |
* License: X11/MIT |
| 7 |
* See LICENSE.md |
| 8 |
*/ |
| 9 |
|
| 10 |
/*global self */ |
| 11 |
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, |
| 12 |
plusplus: true */ |
| 13 |
|
| 14 |
/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */ |
| 15 |
|
| 16 |
var saveAs = saveAs |
| 17 |
|| (navigator.msSaveBlob && navigator.msSaveBlob.bind(navigator)) |
| 18 |
|| (function(view) { |
| 19 |
"use strict"; |
| 20 |
var |
| 21 |
doc = view.document |
| 22 |
// only get URL when necessary in case BlobBuilder.js hasn't overridden it yet |
| 23 |
, get_URL = function() { |
| 24 |
return view.URL || view.webkitURL || view; |
| 25 |
} |
| 26 |
, URL = view.URL || view.webkitURL || view |
| 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 = doc.createEvent("MouseEvents"); |
| 31 |
event.initMouseEvent( |
| 32 |
"click", true, false, view, 0, 0, 0, 0, 0 |
| 33 |
, false, false, false, false, 0, null |
| 34 |
); |
| 35 |
return node.dispatchEvent(event); // false if event was cancelled |
| 36 |
} |
| 37 |
, webkit_req_fs = view.webkitRequestFileSystem |
| 38 |
, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem |
| 39 |
, throw_outside = function (ex) { |
| 40 |
(view.setImmediate || view.setTimeout)(function() { |
| 41 |
throw ex; |
| 42 |
}, 0); |
| 43 |
} |
| 44 |
, force_saveable_type = "application/octet-stream" |
| 45 |
, fs_min_size = 0 |
| 46 |
, deletion_queue = [] |
| 47 |
, process_deletion_queue = function() { |
| 48 |
var i = deletion_queue.length; |
| 49 |
while (i--) { |
| 50 |
var file = deletion_queue[i]; |
| 51 |
if (typeof file === "string") { // file is an object URL |
| 52 |
URL.revokeObjectURL(file); |
| 53 |
} else { // file is a File |
| 54 |
file.remove(); |
| 55 |
} |
| 56 |
} |
| 57 |
deletion_queue.length = 0; // clear queue |
| 58 |
} |
| 59 |
, dispatch = function(filesaver, event_types, event) { |
| 60 |
event_types = [].concat(event_types); |
| 61 |
var i = event_types.length; |
| 62 |
while (i--) { |
| 63 |
var listener = filesaver["on" + event_types[i]]; |
| 64 |
if (typeof listener === "function") { |
| 65 |
try { |
| 66 |
listener.call(filesaver, event || filesaver); |
| 67 |
} catch (ex) { |
| 68 |
throw_outside(ex); |
| 69 |
} |
| 70 |
} |
| 71 |
} |
| 72 |
} |
| 73 |
, FileSaver = function(blob, name) { |
| 74 |
// First try a.download, then web filesystem, then object URLs |
| 75 |
var |
| 76 |
filesaver = this |
| 77 |
, type = blob.type |
| 78 |
, blob_changed = false |
| 79 |
, object_url |
| 80 |
, target_view |
| 81 |
, get_object_url = function() { |
| 82 |
var object_url = get_URL().createObjectURL(blob); |
| 83 |
deletion_queue.push(object_url); |
| 84 |
return object_url; |
| 85 |
} |
| 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 |
// don't create more object URLs than needed |
| 92 |
if (blob_changed || !object_url) { |
| 93 |
object_url = get_object_url(blob); |
| 94 |
} |
| 95 |
if (target_view) { |
| 96 |
target_view.location.href = object_url; |
| 97 |
} |
| 98 |
filesaver.readyState = filesaver.DONE; |
| 99 |
dispatch_all(); |
| 100 |
} |
| 101 |
, abortable = function(func) { |
| 102 |
return function() { |
| 103 |
if (filesaver.readyState !== filesaver.DONE) { |
| 104 |
return func.apply(this, arguments); |
| 105 |
} |
| 106 |
}; |
| 107 |
} |
| 108 |
, create_if_not_found = {create: true, exclusive: false} |
| 109 |
, slice |
| 110 |
; |
| 111 |
filesaver.readyState = filesaver.INIT; |
| 112 |
if (!name) { |
| 113 |
name = "download"; |
| 114 |
} |
| 115 |
if (can_use_save_link) { |
| 116 |
object_url = get_object_url(blob); |
| 117 |
save_link.href = object_url; |
| 118 |
save_link.download = name; |
| 119 |
if (click(save_link)) { |
| 120 |
filesaver.readyState = filesaver.DONE; |
| 121 |
dispatch_all(); |
| 122 |
return; |
| 123 |
} |
| 124 |
} |
| 125 |
// Object and web filesystem URLs have a problem saving in Google Chrome when |
| 126 |
// viewed in a tab, so I force save with application/octet-stream |
| 127 |
// http://code.google.com/p/chromium/issues/detail?id=91158 |
| 128 |
if (view.chrome && type && type !== force_saveable_type) { |
| 129 |
slice = blob.slice || blob.webkitSlice; |
| 130 |
blob = slice.call(blob, 0, blob.size, force_saveable_type); |
| 131 |
blob_changed = true; |
| 132 |
} |
| 133 |
// Since I can't be sure that the guessed media type will trigger a download |
| 134 |
// in WebKit, I append .download to the filename. |
| 135 |
// https://bugs.webkit.org/show_bug.cgi?id=65440 |
| 136 |
if (webkit_req_fs && name !== "download") { |
| 137 |
name += ".download"; |
| 138 |
} |
| 139 |
if (type === force_saveable_type || webkit_req_fs) { |
| 140 |
target_view = view; |
| 141 |
} else { |
| 142 |
target_view = view.open(); |
| 143 |
} |
| 144 |
if (!req_fs) { |
| 145 |
fs_error(); |
| 146 |
return; |
| 147 |
} |
| 148 |
fs_min_size += blob.size; |
| 149 |
req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) { |
| 150 |
fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) { |
| 151 |
var save = function() { |
| 152 |
dir.getFile(name, create_if_not_found, abortable(function(file) { |
| 153 |
file.createWriter(abortable(function(writer) { |
| 154 |
writer.onwriteend = function(event) { |
| 155 |
target_view.location.href = file.toURL(); |
| 156 |
deletion_queue.push(file); |
| 157 |
filesaver.readyState = filesaver.DONE; |
| 158 |
dispatch(filesaver, "writeend", event); |
| 159 |
}; |
| 160 |
writer.onerror = function() { |
| 161 |
var error = writer.error; |
| 162 |
if (error.code !== error.ABORT_ERR) { |
| 163 |
fs_error(); |
| 164 |
} |
| 165 |
}; |
| 166 |
"writestart progress write abort".split(" ").forEach(function(event) { |
| 167 |
writer["on" + event] = filesaver["on" + event]; |
| 168 |
}); |
| 169 |
writer.write(blob); |
| 170 |
filesaver.abort = function() { |
| 171 |
writer.abort(); |
| 172 |
filesaver.readyState = filesaver.DONE; |
| 173 |
}; |
| 174 |
filesaver.readyState = filesaver.WRITING; |
| 175 |
}), fs_error); |
| 176 |
}), fs_error); |
| 177 |
}; |
| 178 |
dir.getFile(name, {create: false}, abortable(function(file) { |
| 179 |
// delete file if it already exists |
| 180 |
file.remove(); |
| 181 |
save(); |
| 182 |
}), abortable(function(ex) { |
| 183 |
if (ex.code === ex.NOT_FOUND_ERR) { |
| 184 |
save(); |
| 185 |
} else { |
| 186 |
fs_error(); |
| 187 |
} |
| 188 |
})); |
| 189 |
}), fs_error); |
| 190 |
}), fs_error); |
| 191 |
} |
| 192 |
, FS_proto = FileSaver.prototype |
| 193 |
, saveAs = function(blob, name) { |
| 194 |
return new FileSaver(blob, name); |
| 195 |
} |
| 196 |
; |
| 197 |
FS_proto.abort = function() { |
| 198 |
var filesaver = this; |
| 199 |
filesaver.readyState = filesaver.DONE; |
| 200 |
dispatch(filesaver, "abort"); |
| 201 |
}; |
| 202 |
FS_proto.readyState = FS_proto.INIT = 0; |
| 203 |
FS_proto.WRITING = 1; |
| 204 |
FS_proto.DONE = 2; |
| 205 |
|
| 206 |
FS_proto.error = |
| 207 |
FS_proto.onwritestart = |
| 208 |
FS_proto.onprogress = |
| 209 |
FS_proto.onwrite = |
| 210 |
FS_proto.onabort = |
| 211 |
FS_proto.onerror = |
| 212 |
FS_proto.onwriteend = |
| 213 |
null; |
| 214 |
|
| 215 |
view.addEventListener("unload", process_deletion_queue, false); |
| 216 |
return saveAs; |
| 217 |
}(self)); |
| 218 |
|
