1 /*! FileSaver.js

     2  *  A saveAs() FileSaver implementation.

     3  *  2014-01-24

     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, 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 

    15 var saveAs = saveAs

    16   // IE 10+ (native saveAs)

    17   || (typeof navigator !== "undefined" &&

    18       navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))

    19   // Everyone else

    20   || (function(view) {

    21 	"use strict";

    22 	// IE <10 is explicitly unsupported

    23 	if (typeof navigator !== "undefined" &&

    24 	    /MSIE [1-9]\./.test(navigator.userAgent)) {

    25 		return;

    26 	}

    27 	var

    28 		  doc = view.document

    29 		  // only get URL when necessary in case BlobBuilder.js hasn't overridden it yet

    30 		, get_URL = function() {

    31 			return view.URL || view.webkitURL || view;

    32 		}

    33 		, URL = view.URL || view.webkitURL || view

    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 					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 				// FF for Android has a nasty garbage collection mechanism

   127 				// that turns all objects that are not pure javascript into 'deadObject'

   128 				// this means `doc` and `save_link` are unusable and need to be recreated

   129 				// `view` is usable though:

   130 				doc = view.document;

   131 				save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a");

   132 				save_link.href = object_url;

   133 				save_link.download = name;

   134 				var event = doc.createEvent("MouseEvents");

   135 				event.initMouseEvent(

   136 					"click", true, false, view, 0, 0, 0, 0, 0

   137 					, false, false, false, false, 0, null

   138 				);

   139 				save_link.dispatchEvent(event);

   140 				filesaver.readyState = filesaver.DONE;

   141 				dispatch_all();

   142 				return;

   143 			}

   144 			// Object and web filesystem URLs have a problem saving in Google Chrome when

   145 			// viewed in a tab, so I force save with application/octet-stream

   146 			// http://code.google.com/p/chromium/issues/detail?id=91158

   147 			if (view.chrome && type && type !== force_saveable_type) {

   148 				slice = blob.slice || blob.webkitSlice;

   149 				blob = slice.call(blob, 0, blob.size, force_saveable_type);

   150 				blob_changed = true;

   151 			}

   152 			// Since I can't be sure that the guessed media type will trigger a download

   153 			// in WebKit, I append .download to the filename.

   154 			// https://bugs.webkit.org/show_bug.cgi?id=65440

   155 			if (webkit_req_fs && name !== "download") {

   156 				name += ".download";

   157 			}

   158 			if (type === force_saveable_type || webkit_req_fs) {

   159 				target_view = view;

   160 			}

   161 			if (!req_fs) {

   162 				fs_error();

   163 				return;

   164 			}

   165 			fs_min_size += blob.size;

   166 			req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {

   167 				fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {

   168 					var save = function() {

   169 						dir.getFile(name, create_if_not_found, abortable(function(file) {

   170 							file.createWriter(abortable(function(writer) {

   171 								writer.onwriteend = function(event) {

   172 									target_view.location.href = file.toURL();

   173 									deletion_queue.push(file);

   174 									filesaver.readyState = filesaver.DONE;

   175 									dispatch(filesaver, "writeend", event);

   176 								};

   177 								writer.onerror = function() {

   178 									var error = writer.error;

   179 									if (error.code !== error.ABORT_ERR) {

   180 										fs_error();

   181 									}

   182 								};

   183 								"writestart progress write abort".split(" ").forEach(function(event) {

   184 									writer["on" + event] = filesaver["on" + event];

   185 								});

   186 								writer.write(blob);

   187 								filesaver.abort = function() {

   188 									writer.abort();

   189 									filesaver.readyState = filesaver.DONE;

   190 								};

   191 								filesaver.readyState = filesaver.WRITING;

   192 							}), fs_error);

   193 						}), fs_error);

   194 					};

   195 					dir.getFile(name, {create: false}, abortable(function(file) {

   196 						// delete file if it already exists

   197 						file.remove();

   198 						save();

   199 					}), abortable(function(ex) {

   200 						if (ex.code === ex.NOT_FOUND_ERR) {

   201 							save();

   202 						} else {

   203 							fs_error();

   204 						}

   205 					}));

   206 				}), fs_error);

   207 			}), fs_error);

   208 		}

   209 		, FS_proto = FileSaver.prototype

   210 		, saveAs = function(blob, name) {

   211 			return new FileSaver(blob, name);

   212 		}

   213 	;

   214 	FS_proto.abort = function() {

   215 		var filesaver = this;

   216 		filesaver.readyState = filesaver.DONE;

   217 		dispatch(filesaver, "abort");

   218 	};

   219 	FS_proto.readyState = FS_proto.INIT = 0;

   220 	FS_proto.WRITING = 1;

   221 	FS_proto.DONE = 2;

   222 

   223 	FS_proto.error =

   224 	FS_proto.onwritestart =

   225 	FS_proto.onprogress =

   226 	FS_proto.onwrite =

   227 	FS_proto.onabort =

   228 	FS_proto.onerror =

   229 	FS_proto.onwriteend =

   230 		null;

   231 

   232 	view.addEventListener("unload", process_deletion_queue, false);

   233 	saveAs.unload = function() {

   234 		process_deletion_queue();

   235 		view.removeEventListener("unload", process_deletion_queue, false);

   236 	};

   237 	return saveAs;

   238 }(

   239 	   typeof self !== "undefined" && self

   240 	|| typeof window !== "undefined" && window

   241 	|| this.content

   242 ));

   243 // `self` is undefined in Firefox for Android content script context

   244 // while `this` is nsIContentFrameMessageManager

   245 // with an attribute `content` that corresponds to the window

   246 

   247 if (typeof module !== "undefined" && module !== null) {

   248   module.exports = saveAs;

   249 } else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {

   250   define([], function() {

   251     return saveAs;

   252   });

   253 }