Synnefo

/* FileSaver.js

 * A saveAs() FileSaver implementation.

 * 2013-10-21

 *

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

 * License: X11/MIT

 *   See LICENSE.md

 */

/*global self */

/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,

  plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs = saveAs

  || (typeof navigator !== 'undefined' && navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))

  || (function(view) {

        "use strict";

        var

                  doc = view.document

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

                , get_URL = function() {

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

                }

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

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

                , can_use_save_link =  !view.externalHost && "download" in save_link

                , click = function(node) {

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

                        event.initMouseEvent(

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

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

                        );

                        node.dispatchEvent(event);

                }

                , webkit_req_fs = view.webkitRequestFileSystem

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

                , throw_outside = function (ex) {

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

                                throw ex;

                        }, 0);

                }

                , force_saveable_type = "application/octet-stream"

                , fs_min_size = 0

                , deletion_queue = []

                , process_deletion_queue = function() {

                        var i = deletion_queue.length;

                        while (i--) {

                                var file = deletion_queue[i];

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

                                        URL.revokeObjectURL(file);

                                } else { // file is a File

                                        file.remove();

                                }

                        }

                        deletion_queue.length = 0; // clear queue

                }

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

                        event_types = [].concat(event_types);

                        var i = event_types.length;

                        while (i--) {

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

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

                                        try {

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

                                        } catch (ex) {

                                                throw_outside(ex);

                                        }

                                }

                        }

                }

                , FileSaver = function(blob, name) {

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

                        var

                                  filesaver = this

                                , type = blob.type

                                , blob_changed = false

                                , object_url

                                , target_view

                                , get_object_url = function() {

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

                                        deletion_queue.push(object_url);

                                        return object_url;

                                }

                                , dispatch_all = function() {

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

                                }

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

                                , fs_error = function() {

                                        // don't create more object URLs than needed

                                        if (blob_changed || !object_url) {

                                                object_url = get_object_url(blob);

                                        }

                                        if (target_view) {

                                                target_view.location.href = object_url;

                                        } else {

                        window.open(object_url, "_blank");

                    }

                                        filesaver.readyState = filesaver.DONE;

                                        dispatch_all();

                                }

                                , abortable = function(func) {

                                        return function() {

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

                                                        return func.apply(this, arguments);

                                                }

                                        };

                                }

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

                                , slice

                        ;

                        filesaver.readyState = filesaver.INIT;

                        if (!name) {

                                name = "download";

                        }

                        if (can_use_save_link) {

                                object_url = get_object_url(blob);

                                // FF for Android has a nasty garbage collection mechanism

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

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

                                // `view` is usable though:

                                doc = view.document;

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

                                save_link.href = object_url;

                                save_link.download = name;

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

                                event.initMouseEvent(

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

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

                                );

                                save_link.dispatchEvent(event);

                                filesaver.readyState = filesaver.DONE;

                                dispatch_all();

                                return;

                        }

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

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

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

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

                                slice = blob.slice || blob.webkitSlice;

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

                                blob_changed = true;

                        }

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

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

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

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

                                name += ".download";

                        }

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

                                target_view = view;

                        }

                        if (!req_fs) {

                                fs_error();

                                return;

                        }

                        fs_min_size += blob.size;

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

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

                                        var save = function() {

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

                                                        file.createWriter(abortable(function(writer) {

                                                                writer.onwriteend = function(event) {

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

                                                                        deletion_queue.push(file);

                                                                        filesaver.readyState = filesaver.DONE;

                                                                        dispatch(filesaver, "writeend", event);

                                                                };

                                                                writer.onerror = function() {

                                                                        var error = writer.error;

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

                                                                                fs_error();

                                                                        }

                                                                };

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

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

                                                                });

                                                                writer.write(blob);

                                                                filesaver.abort = function() {

                                                                        writer.abort();

                                                                        filesaver.readyState = filesaver.DONE;

                                                                };

                                                                filesaver.readyState = filesaver.WRITING;

                                                        }), fs_error);

                                                }), fs_error);

                                        };

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

                                                // delete file if it already exists

                                                file.remove();

                                                save();

                                        }), abortable(function(ex) {

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

                                                        save();

                                                } else {

                                                        fs_error();

                                                }

                                        }));

                                }), fs_error);

                        }), fs_error);

                }

                , FS_proto = FileSaver.prototype

                , saveAs = function(blob, name) {

                        return new FileSaver(blob, name);

                }

        ;

        FS_proto.abort = function() {

                var filesaver = this;

                filesaver.readyState = filesaver.DONE;

                dispatch(filesaver, "abort");

        };

        FS_proto.readyState = FS_proto.INIT = 0;

        FS_proto.WRITING = 1;

        FS_proto.DONE = 2;

        FS_proto.error =

        FS_proto.onwritestart =

        FS_proto.onprogress =

        FS_proto.onwrite =

        FS_proto.onabort =

        FS_proto.onerror =

        FS_proto.onwriteend =

                null;

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

        return saveAs;

}(this.self || this.window || this.content));

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

// while `this` is nsIContentFrameMessageManager

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

if (typeof module !== 'undefined') module.exports = saveAs;