1/* FileSaver.js 2 * A saveAs() & saveTextAs() FileSaver implementation. 3 * 2014-06-24 4 * 5 * Modify by Brian Chen 6 * Author: Eli Grey, http://eligrey.com 7 * License: X11/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 17 // IE 10+ (native saveAs) 18 || (typeof navigator !== "undefined" && 19 navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator)) 20 // Everyone else 21 || (function (view) { 22 "use strict"; 23 // IE <10 is explicitly unsupported 24 if (typeof navigator !== "undefined" && 25 /MSIE [1-9]\./.test(navigator.userAgent)) { 26 return; 27 } 28 var 29 doc = view.document 30 // only get URL when necessary in case Blob.js hasn't overridden it yet 31 , get_URL = function () { 32 return view.URL || view.webkitURL || view; 33 } 34 , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a") 35 , can_use_save_link = !view.externalHost && "download" in save_link 36 , click = function (node) { 37 var event = doc.createEvent("MouseEvents"); 38 event.initMouseEvent( 39 "click", true, false, view, 0, 0, 0, 0, 0 40 , false, false, false, false, 0, null 41 ); 42 node.dispatchEvent(event); 43 } 44 , webkit_req_fs = view.webkitRequestFileSystem 45 , req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem 46 , throw_outside = function (ex) { 47 (view.setImmediate || view.setTimeout)(function () { 48 throw ex; 49 }, 0); 50 } 51 , force_saveable_type = "application/octet-stream" 52 , fs_min_size = 0 53 , deletion_queue = [] 54 , process_deletion_queue = function () { 55 var i = deletion_queue.length; 56 while (i--) { 57 var file = deletion_queue[i]; 58 if (typeof file === "string") { // file is an object URL 59 get_URL().revokeObjectURL(file); 60 } else { // file is a File 61 file.remove(); 62 } 63 }
64 deletion_queue.length = 0; // clear queue 65 } 66 , dispatch = function (filesaver, event_types, event) { 67 event_types = [].concat(event_types); 68 var i = event_types.length; 69 while (i--) { 70 var listener = filesaver["on" + event_types[i]]; 71 if (typeof listener === "function") { 72 try { 73 listener.call(filesaver, event || filesaver); 74 } catch (ex) { 75 throw_outside(ex); 76 } 77 } 78 } 79 } 80 , FileSaver = function (blob, name) { 81 // First try a.download, then web filesystem, then object URLs 82 var 83 filesaver = this 84 , type = blob.type 85 , blob_changed = false 86 , object_url 87 , target_view 88 , get_object_url = function () { 89 var object_url = get_URL().createObjectURL(blob);
90 deletion_queue.push(object_url); 91 return object_url; 92 } 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 // don't create more object URLs than needed 99 if (blob_changed || !object_url) { 100 object_url = get_object_url(blob); 101 } 102 if (target_view) { 103 target_view.location.href = object_url; 104 } else { 105 window.open(object_url, "_blank"); 106 } 107 filesaver.readyState = filesaver.DONE; 108 dispatch_all(); 109 } 110 , abortable = function (func) { 111 return function () { 112 if (filesaver.readyState !== filesaver.DONE) { 113 return func.apply(this, arguments); 114 } 115 }; 116 } 117 , create_if_not_found = { create: true, exclusive: false } 118 , slice 119 ; 120 filesaver.readyState = filesaver.INIT; 121 if (!name) { 122 name = "download"; 123 } 124 if (can_use_save_link) { 125 object_url = get_object_url(blob); 126 save_link.href = object_url;
127 save_link.download = name; 128 click(save_link); 129 filesaver.readyState = filesaver.DONE; 130 dispatch_all(); 131 return; 132 } 133 // Object and web filesystem URLs have a problem saving in Google Chrome when 134 // viewed in a tab, so I force save with application/octet-stream 135 // http://code.google.com/p/chromium/issues/detail?id=91158 136 if (view.chrome && type && type !== force_saveable_type) { 137 slice = blob.slice || blob.webkitSlice; 138 blob = slice.call(blob, 0, blob.size, force_saveable_type); 139 blob_changed = true; 140 } 141 // Since I can't be sure that the guessed media type will trigger a download 142 // in WebKit, I append .download to the filename. 143 // https://bugs.webkit.org/show_bug.cgi?id=65440 144 if (webkit_req_fs && name !== "download") { 145 name += ".download"; 146 } 147 if (type === force_saveable_type || webkit_req_fs) { 148 target_view = view; 149 } 150 if (!req_fs) { 151 fs_error(); 152 return; 153 } 154 fs_min_size += blob.size; 155 req_fs(view.TEMPORARY, fs_min_size, abortable(function (fs) { 156 fs.root.getDirectory("saved", create_if_not_found, abortable(function (dir) { 157 var save = function () { 158 dir.getFile(name, create_if_not_found, abortable(function (file) { 159 file.createWriter(abortable(function (writer) { 160 writer.onwriteend = function (event) { 161 target_view.location.href = file.toURL();
162 deletion_queue.push(file); 163 filesaver.readyState = filesaver.DONE; 164 dispatch(filesaver, "writeend", event); 165 }; 166 writer.onerror = function () { 167 var error = writer.error; 168 if (error.code !== error.ABORT_ERR) { 169 fs_error(); 170 } 171 }; 172 "writestart progress write abort".split(" ").forEach(function (event) { 173 writer["on" + event] = filesaver["on" + event]; 174 }); 175 writer.write(blob); 176 filesaver.abort = function () { 177 writer.abort(); 178 filesaver.readyState = filesaver.DONE; 179 }; 180 filesaver.readyState = filesaver.WRITING; 181 }), fs_error); 182 }), fs_error); 183 }; 184 dir.getFile(name, { create: false }, abortable(function (file) { 185 // delete file if it already exists 186 file.remove(); 187 save(); 188 }), abortable(function (ex) { 189 if (ex.code === ex.NOT_FOUND_ERR) { 190 save(); 191 } else { 192 fs_error(); 193 } 194 })); 195 }), fs_error); 196 }), fs_error); 197 } 198 , FS_proto = FileSaver.prototype 199 , saveAs = function (blob, name) { 200 return new FileSaver(blob, name); 201 } 202 ; 203 FS_proto.abort = function () { 204 var filesaver = this; 205 filesaver.readyState = filesaver.DONE; 206 dispatch(filesaver, "abort"); 207 }; 208 FS_proto.readyState = FS_proto.INIT = 0; 209 FS_proto.WRITING = 1; 210 FS_proto.DONE = 2; 211 212 FS_proto.error = 213 FS_proto.onwritestart = 214 FS_proto.onprogress = 215 FS_proto.onwrite = 216 FS_proto.onabort = 217 FS_proto.onerror = 218 FS_proto.onwriteend = 219 null; 220 221 view.addEventListener("unload", process_deletion_queue, false); 222 saveAs.unload = function () { 223 process_deletion_queue(); 224 view.removeEventListener("unload", process_deletion_queue, false); 225 }; 226 return saveAs; 227 }( 228 typeof self !== "undefined" && self 229 || typeof window !== "undefined" && window 230 || this.content 231)); 232// `self` is undefined in Firefox for Android content script context 233// while `this` is nsIContentFrameMessageManager 234// with an attribute `content` that corresponds to the window 235 236if (typeof module !== "undefined" && module !== null) { 237 module.exports = saveAs; 238} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) { 239 define([], function () { 240 return saveAs; 241 }); 242} 243 244String.prototype.endsWithAny = function () { 245 var strArray = Array.prototype.slice.call(arguments), 246 $this = this.toLowerCase().toString(); 247 for (var i = 0; i < strArray.length; i++) { 248 if ($this.indexOf(strArray[i], $this.length - strArray[i].length) !== -1) return true; 249 } 250 return false; 251}; 252 253var saveTextAs = saveTextAs 254|| (function (textContent, fileName, charset) { 255 fileName = fileName || 'download.txt'; 256 charset = charset || 'utf-8'; 257 textContent = (textContent || '').replace(/\r?\n/g, "\r\n"); 258 if (saveAs && Blob) { 259 var blob = new Blob([textContent], { type: "text/plain;charset=" + charset }); 260 saveAs(blob, fileName); 261 return true; 262 } else {//IE9- 263 var saveTxtWindow = window.frames.saveTxtWindow; 264 if (!saveTxtWindow) { 265 saveTxtWindow = document.createElement('iframe'); 266 saveTxtWindow.id = 'saveTxtWindow'; 267 saveTxtWindow.style.display = 'none'; 268 document.body.insertBefore(saveTxtWindow, null); 269 saveTxtWindow = window.frames.saveTxtWindow; 270 if (!saveTxtWindow) { 271 saveTxtWindow = window.open('', '_temp', 'width=100,height=100'); 272 if (!saveTxtWindow) { 273 window.alert('Sorry, download file could not be created.'); 274 return false;
275 } 276 } 277 } 278 279 var doc = saveTxtWindow.document; 280 doc.open('text/html', 'replace'); 281 doc.charset = charset; 282 if (fileName.endsWithAny('.htm', '.html')) { 283 doc.close(); 284 doc.body.innerHTML = '\r\n' + textContent + '\r\n'; 285 } else { 286 if (!fileName.endsWithAny('.txt')) fileName += '.txt'; 287 doc.write(textContent); 288 doc.close(); 289 } 290 291 var retValue = doc.execCommand('SaveAs', null, fileName); 292 saveTxtWindow.close(); 293 return retValue; 294 } 295})
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