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| 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.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 | + save_link.href = object_url; |
| 120 | + save_link.download = name; |
| 121 | + click(save_link); |
| 122 | + filesaver.readyState = filesaver.DONE; |
| 123 | + dispatch_all(); |
| 124 | + return; |
| 125 | + } |
| 126 | + // Object and web filesystem URLs have a problem saving in Google Chrome when |
| 127 | + // viewed in a tab, so I force save with application/octet-stream |
| 128 | + // http://code.google.com/p/chromium/issues/detail?id=91158 |
| 129 | + if (view.chrome && type && type !== force_saveable_type) { |
| 130 | + slice = blob.slice || blob.webkitSlice; |
| 131 | + blob = slice.call(blob, 0, blob.size, force_saveable_type); |
| 132 | + blob_changed = true; |
| 133 | + } |
| 134 | + // Since I can't be sure that the guessed media type will trigger a download |
| 135 | + // in WebKit, I append .download to the filename. |
| 136 | + // https://bugs.webkit.org/show_bug.cgi?id=65440 |
| 137 | + if (webkit_req_fs && name !== "download") { |
| 138 | + name += ".download"; |
| 139 | + } |
| 140 | + if (type === force_saveable_type || webkit_req_fs) { |
| 141 | + target_view = view; |
| 142 | + } |
| 143 | + if (!req_fs) { |
| 144 | + fs_error(); |
| 145 | + return; |
| 146 | + } |
| 147 | + fs_min_size += blob.size; |
| 148 | + req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) { |
| 149 | + fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) { |
| 150 | + var save = function() { |
| 151 | + dir.getFile(name, create_if_not_found, abortable(function(file) { |
| 152 | + file.createWriter(abortable(function(writer) { |
| 153 | + writer.onwriteend = function(event) { |
| 154 | + target_view.location.href = file.toURL(); |
| 155 | + deletion_queue.push(file); |
| 156 | + filesaver.readyState = filesaver.DONE; |
| 157 | + dispatch(filesaver, "writeend", event); |
| 158 | + }; |
| 159 | + writer.onerror = function() { |
| 160 | + var error = writer.error; |
| 161 | + if (error.code !== error.ABORT_ERR) { |
| 162 | + fs_error(); |
| 163 | + } |
| 164 | + }; |
| 165 | + "writestart progress write abort".split(" ").forEach(function(event) { |
| 166 | + writer["on" + event] = filesaver["on" + event]; |
| 167 | + }); |
| 168 | + writer.write(blob); |
| 169 | + filesaver.abort = function() { |
| 170 | + writer.abort(); |
| 171 | + filesaver.readyState = filesaver.DONE; |
| 172 | + }; |
| 173 | + filesaver.readyState = filesaver.WRITING; |
| 174 | + }), fs_error); |
| 175 | + }), fs_error); |
| 176 | + }; |
| 177 | + dir.getFile(name, {create: false}, abortable(function(file) { |
| 178 | + // delete file if it already exists |
| 179 | + file.remove(); |
| 180 | + save(); |
| 181 | + }), abortable(function(ex) { |
| 182 | + if (ex.code === ex.NOT_FOUND_ERR) { |
| 183 | + save(); |
| 184 | + } else { |
| 185 | + fs_error(); |
| 186 | + } |
| 187 | + })); |
| 188 | + }), fs_error); |
| 189 | + }), fs_error); |
| 190 | + } |
| 191 | + , FS_proto = FileSaver.prototype |
| 192 | + , saveAs = function(blob, name) { |
| 193 | + return new FileSaver(blob, name); |
| 194 | + } |
| 195 | + ; |
| 196 | + FS_proto.abort = function() { |
| 197 | + var filesaver = this; |
| 198 | + filesaver.readyState = filesaver.DONE; |
| 199 | + dispatch(filesaver, "abort"); |
| 200 | + }; |
| 201 | + FS_proto.readyState = FS_proto.INIT = 0; |
| 202 | + FS_proto.WRITING = 1; |
| 203 | + FS_proto.DONE = 2; |
| 204 | + |
| 205 | + FS_proto.error = |
| 206 | + FS_proto.onwritestart = |
| 207 | + FS_proto.onprogress = |
| 208 | + FS_proto.onwrite = |
| 209 | + FS_proto.onabort = |
| 210 | + FS_proto.onerror = |
| 211 | + FS_proto.onwriteend = |
| 212 | + null; |
| 213 | + |
| 214 | + view.addEventListener("unload", process_deletion_queue, false); |
| 215 | + return saveAs; |
| 216 | +}(self)); |
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