koha-tmpl/intranet-tmpl/lib/filesaver.js

   1 /* FileSaver.js
   2  * A saveAs() FileSaver implementation.
   3  * 2013-10-21
   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   || (typeof navigator !== 'undefined' && navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.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 =  !view.externalHost && "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                         node.dispatchEvent(event);
  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                                         } else {
  98                         window.open(object_url, "_blank");
  99                     }
 100                                         filesaver.readyState = filesaver.DONE;
 101                                         dispatch_all();
 102                                 }
 103                                 , abortable = function(func) {
 104                                         return function() {
 105                                                 if (filesaver.readyState !== filesaver.DONE) {
 106                                                         return func.apply(this, arguments);
 107                                                 }
 108                                         };
 109                                 }
 110                                 , create_if_not_found = {create: true, exclusive: false}
 111                                 , slice
 112                         ;
 113                         filesaver.readyState = filesaver.INIT;
 114                         if (!name) {
 115                                 name = "download";
 116                         }
 117                         if (can_use_save_link) {
 118                                 object_url = get_object_url(blob);
 119                                 // FF for Android has a nasty garbage collection mechanism
 120                                 // that turns all objects that are not pure javascript into 'deadObject'
 121                                 // this means `doc` and `save_link` are unusable and need to be recreated
 122                                 // `view` is usable though:
 123                                 doc = view.document;
 124                                 save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a");
 125                                 save_link.href = object_url;
 126                                 save_link.download = name;
 127                                 var event = doc.createEvent("MouseEvents");
 128                                 event.initMouseEvent(
 129                                         "click", true, false, view, 0, 0, 0, 0, 0
 130                                         , false, false, false, false, 0, null
 131                                 );
 132                                 save_link.dispatchEvent(event);
 133                                 filesaver.readyState = filesaver.DONE;
 134                                 dispatch_all();
 135                                 return;
 136                         }
 137                         // Object and web filesystem URLs have a problem saving in Google Chrome when
 138                         // viewed in a tab, so I force save with application/octet-stream
 139                         // http://code.google.com/p/chromium/issues/detail?id=91158
 140                         if (view.chrome && type && type !== force_saveable_type) {
 141                                 slice = blob.slice || blob.webkitSlice;
 142                                 blob = slice.call(blob, 0, blob.size, force_saveable_type);
 143                                 blob_changed = true;
 144                         }
 145                         // Since I can't be sure that the guessed media type will trigger a download
 146                         // in WebKit, I append .download to the filename.
 147                         // https://bugs.webkit.org/show_bug.cgi?id=65440
 148                         if (webkit_req_fs && name !== "download") {
 149                                 name += ".download";
 150                         }
 151                         if (type === force_saveable_type || webkit_req_fs) {
 152                                 target_view = view;
 153                         }
 154                         if (!req_fs) {
 155                                 fs_error();
 156                                 return;
 157                         }
 158                         fs_min_size += blob.size;
 159                         req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
 160                                 fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
 161                                         var save = function() {
 162                                                 dir.getFile(name, create_if_not_found, abortable(function(file) {
 163                                                         file.createWriter(abortable(function(writer) {
 164                                                                 writer.onwriteend = function(event) {
 165                                                                         target_view.location.href = file.toURL();
 166                                                                         deletion_queue.push(file);
 167                                                                         filesaver.readyState = filesaver.DONE;
 168                                                                         dispatch(filesaver, "writeend", event);
 169                                                                 };
 170                                                                 writer.onerror = function() {
 171                                                                         var error = writer.error;
 172                                                                         if (error.code !== error.ABORT_ERR) {
 173                                                                                 fs_error();
 174                                                                         }
 175                                                                 };
 176                                                                 "writestart progress write abort".split(" ").forEach(function(event) {
 177                                                                         writer["on" + event] = filesaver["on" + event];
 178                                                                 });
 179                                                                 writer.write(blob);
 180                                                                 filesaver.abort = function() {
 181                                                                         writer.abort();
 182                                                                         filesaver.readyState = filesaver.DONE;
 183                                                                 };
 184                                                                 filesaver.readyState = filesaver.WRITING;
 185                                                         }), fs_error);
 186                                                 }), fs_error);
 187                                         };
 188                                         dir.getFile(name, {create: false}, abortable(function(file) {
 189                                                 // delete file if it already exists
 190                                                 file.remove();
 191                                                 save();
 192                                         }), abortable(function(ex) {
 193                                                 if (ex.code === ex.NOT_FOUND_ERR) {
 194                                                         save();
 195                                                 } else {
 196                                                         fs_error();
 197                                                 }
 198                                         }));
 199                                 }), fs_error);
 200                         }), fs_error);
 201                 }
 202                 , FS_proto = FileSaver.prototype
 203                 , saveAs = function(blob, name) {
 204                         return new FileSaver(blob, name);
 205                 }
 206         ;
 207         FS_proto.abort = function() {
 208                 var filesaver = this;
 209                 filesaver.readyState = filesaver.DONE;
 210                 dispatch(filesaver, "abort");
 211         };
 212         FS_proto.readyState = FS_proto.INIT = 0;
 213         FS_proto.WRITING = 1;
 214         FS_proto.DONE = 2;
 215
 216         FS_proto.error =
 217         FS_proto.onwritestart =
 218         FS_proto.onprogress =
 219         FS_proto.onwrite =
 220         FS_proto.onabort =
 221         FS_proto.onerror =
 222         FS_proto.onwriteend =
 223                 null;
 224
 225         view.addEventListener("unload", process_deletion_queue, false);
 226         return saveAs;
 227 }(this.self || this.window || this.content));
 228 // `self` is undefined in Firefox for Android content script context
 229 // while `this` is nsIContentFrameMessageManager
 230 // with an attribute `content` that corresponds to the window
 231
 232 if (typeof module !== 'undefined') module.exports = saveAs;