1 /* FileSaver.js

     2  * A saveAs() FileSaver implementation.

     3  * 1.1.20150716

     4  *

     5  * By Eli Grey, http://eligrey.com

     6  * License: X11/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 

    15 var 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 		, webkit_req_fs = view.webkitRequestFileSystem

    34 		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem

    35 		, throw_outside = function(ex) {

    36 			(view.setImmediate || view.setTimeout)(function() {

    37 				throw ex;

    38 			}, 0);

    39 		}

    40 		, force_saveable_type = "application/octet-stream"

    41 		, fs_min_size = 0

    42 		// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and

    43 		// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047

    44 		// for the reasoning behind the timeout and revocation flow

    45 		, arbitrary_revoke_timeout = 500 // in ms

    46 		, revoke = function(file) {

    47 			var revoker = function() {

    48 				if (typeof file === "string") { // file is an object URL

    49 					get_URL().revokeObjectURL(file);

    50 				} else { // file is a File

    51 					file.remove();

    52 				}

    53 			};

    54 			if (view.chrome) {

    55 				revoker();

    56 			} else {

    57 				setTimeout(revoker, arbitrary_revoke_timeout);

    58 			}

    59 		}

    60 		, dispatch = function(filesaver, event_types, event) {

    61 			event_types = [].concat(event_types);

    62 			var i = event_types.length;

    63 			while (i--) {

    64 				var listener = filesaver["on" + event_types[i]];

    65 				if (typeof listener === "function") {

    66 					try {

    67 						listener.call(filesaver, event || filesaver);

    68 					} catch (ex) {

    69 						throw_outside(ex);

    70 					}

    71 				}

    72 			}

    73 		}

    74 		, auto_bom = function(blob) {

    75 			// prepend BOM for UTF-8 XML and text/* types (including HTML)

    76 			if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {

    77 				return new Blob(["\ufeff", blob], {type: blob.type});

    78 			}

    79 			return blob;

    80 		}

    81 		, FileSaver = function(blob, name, no_auto_bom) {

    82 			if (!no_auto_bom) {

    83 				blob = auto_bom(blob);

    84 			}

    85 			// First try a.download, then web filesystem, then object URLs

    86 			var

    87 				  filesaver = this

    88 				, type = blob.type

    89 				, blob_changed = false

    90 				, object_url

    91 				, target_view

    92 				, dispatch_all = function() {

    93 					dispatch(filesaver, "writestart progress write writeend".split(" "));

    94 				}

    95 				// on any filesys errors revert to saving with object URLs

    96 				, fs_error = function() {

    97 					// don't create more object URLs than needed

    98 					if (blob_changed || !object_url) {

    99 						object_url = get_URL().createObjectURL(blob);

   100 					}

   101 					if (target_view) {

   102 						target_view.location.href = object_url;

   103 					} else {

   104 						var new_tab = view.open(object_url, "_blank");

   105 						if (new_tab == undefined && typeof safari !== "undefined") {

   106 							//Apple do not allow window.open, see http://bit.ly/1kZffRI

   107 							view.location.href = object_url

   108 						}

   109 					}

   110 					filesaver.readyState = filesaver.DONE;

   111 					dispatch_all();

   112 					revoke(object_url);

   113 				}

   114 				, abortable = function(func) {

   115 					return function() {

   116 						if (filesaver.readyState !== filesaver.DONE) {

   117 							return func.apply(this, arguments);

   118 						}

   119 					};

   120 				}

   121 				, create_if_not_found = {create: true, exclusive: false}

   122 				, slice

   123 			;

   124 			filesaver.readyState = filesaver.INIT;

   125 			if (!name) {

   126 				name = "download";

   127 			}

   128 			if (can_use_save_link) {

   129 				object_url = get_URL().createObjectURL(blob);

   130 				save_link.href = object_url;

   131 				save_link.download = name;

   132 				setTimeout(function() {

   133 					click(save_link);

   134 					dispatch_all();

   135 					revoke(object_url);

   136 					filesaver.readyState = filesaver.DONE;

   137 				});

   138 				return;

   139 			}

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

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

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

   143 			// Update: Google errantly closed 91158, I submitted it again:

   144 			// https://code.google.com/p/chromium/issues/detail?id=389642

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

   146 				slice = blob.slice || blob.webkitSlice;

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

   148 				blob_changed = true;

   149 			}

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

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

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

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

   154 				name += ".download";

   155 			}

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

   157 				target_view = view;

   158 			}

   159 			if (!req_fs) {

   160 				fs_error();

   161 				return;

   162 			}

   163 			fs_min_size += blob.size;

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

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

   166 					var save = function() {

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

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

   169 								writer.onwriteend = function(event) {

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

   171 									filesaver.readyState = filesaver.DONE;

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

   173 									revoke(file);

   174 								};

   175 								writer.onerror = function() {

   176 									var error = writer.error;

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

   178 										fs_error();

   179 									}

   180 								};

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

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

   183 								});

   184 								writer.write(blob);

   185 								filesaver.abort = function() {

   186 									writer.abort();

   187 									filesaver.readyState = filesaver.DONE;

   188 								};

   189 								filesaver.readyState = filesaver.WRITING;

   190 							}), fs_error);

   191 						}), fs_error);

   192 					};

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

   194 						// delete file if it already exists

   195 						file.remove();

   196 						save();

   197 					}), abortable(function(ex) {

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

   199 							save();

   200 						} else {

   201 							fs_error();

   202 						}

   203 					}));

   204 				}), fs_error);

   205 			}), fs_error);

   206 		}

   207 		, FS_proto = FileSaver.prototype

   208 		, saveAs = function(blob, name, no_auto_bom) {

   209 			return new FileSaver(blob, name, no_auto_bom);

   210 		}

   211 	;

   212 	// IE 10+ (native saveAs)

   213 	if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {

   214 		return function(blob, name, no_auto_bom) {

   215 			if (!no_auto_bom) {

   216 				blob = auto_bom(blob);

   217 			}

   218 			return navigator.msSaveOrOpenBlob(blob, name || "download");

   219 		};

   220 	}

   221 

   222 	FS_proto.abort = function() {

   223 		var filesaver = this;

   224 		filesaver.readyState = filesaver.DONE;

   225 		dispatch(filesaver, "abort");

   226 	};

   227 	FS_proto.readyState = FS_proto.INIT = 0;

   228 	FS_proto.WRITING = 1;

   229 	FS_proto.DONE = 2;

   230 

   231 	FS_proto.error =

   232 	FS_proto.onwritestart =

   233 	FS_proto.onprogress =

   234 	FS_proto.onwrite =

   235 	FS_proto.onabort =

   236 	FS_proto.onerror =

   237 	FS_proto.onwriteend =

   238 		null;

   239 

   240 	return saveAs;

   241 }(

   242 	   typeof self !== "undefined" && self

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

   244 	|| this.content

   245 ));

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

   247 // while `this` is nsIContentFrameMessageManager

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

   249 

   250 if (typeof module !== "undefined" && module.exports) {

   251   module.exports.saveAs = saveAs;

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

   253   define([], function() {

   254     return saveAs;

   255   });

   256 }