blockbench/lib/FileSaver.js

(function (global, factory) {
	if (typeof define === "function" && define.amd) {
	  define([], factory);
	} else if (typeof exports !== "undefined") {
	  factory();
	} else {
	  var mod = {
		exports: {}
	  };
	  factory();
	  global.FileSaver = mod.exports;
	}
  })(this, function () {
	"use strict";
  
	/*
	* FileSaver.js
	* A saveAs() FileSaver implementation.
	*
	* By Eli Grey, http://eligrey.com
	*
	* License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
	* source  : http://purl.eligrey.com/github/FileSaver.js
	*/
	// The one and only way of getting global scope in all environments
	// https://stackoverflow.com/q/3277182/1008999
	var _global = typeof window === 'object' && window.window === window ? window : typeof self === 'object' && self.self === self ? self : typeof global === 'object' && global.global === global ? global : void 0;
  
	function bom(blob, opts) {
	  if (typeof opts === 'undefined') opts = {
		autoBom: false
	  };else if (typeof opts !== 'object') {
		console.warn('Deprecated: Expected third argument to be a object');
		opts = {
		  autoBom: !opts
		};
	  } // prepend BOM for UTF-8 XML and text/* types (including HTML)
	  // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
  
	  if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
		return new Blob([String.fromCharCode(0xFEFF), blob], {
		  type: blob.type
		});
	  }
  
	  return blob;
	}
  
	function download(url, name, opts) {
	  var xhr = new XMLHttpRequest();
	  xhr.open('GET', url);
	  xhr.responseType = 'blob';
  
	  xhr.onload = function () {
		saveAs(xhr.response, name, opts);
	  };
  
	  xhr.onerror = function () {
		console.error('could not download file');
	  };
  
	  xhr.send();
	}
  
	function corsEnabled(url) {
	  var xhr = new XMLHttpRequest(); // use sync to avoid popup blocker
  
	  xhr.open('HEAD', url, false);
  
	  try {
		xhr.send();
	  } catch (e) {}
  
	  return xhr.status >= 200 && xhr.status <= 299;
	} // `a.click()` doesn't work for all browsers (#465)
  
  
	function click(node) {
	  try {
		node.dispatchEvent(new MouseEvent('click'));
	  } catch (e) {
		var evt = document.createEvent('MouseEvents');
		evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80, 20, false, false, false, false, 0, null);
		node.dispatchEvent(evt);
	  }
	} // Detect WebView inside a native macOS app by ruling out all browsers
	// We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
	// https://www.whatismybrowser.com/guides/the-latest-user-agent/macos
  
  
	var isMacOSWebView = /Macintosh/.test(navigator.userAgent) && /AppleWebKit/.test(navigator.userAgent) && !/Safari/.test(navigator.userAgent);
	var saveAs = _global.saveAs || ( // probably in some web worker
	typeof window !== 'object' || window !== _global ? function saveAs() {}
	/* noop */
	// Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
	: 'download' in HTMLAnchorElement.prototype && !isMacOSWebView ? function saveAs(blob, name, opts) {
	  var URL = _global.URL || _global.webkitURL;
	  var a = document.createElement('a');
	  name = name || blob.name || 'download';
	  a.download = name;
	  a.rel = 'noopener'; // tabnabbing
	  // TODO: detect chrome extensions & packaged apps
	  // a.target = '_blank'
  
	  if (typeof blob === 'string') {
		// Support regular links
		a.href = blob;
  
		if (a.origin !== location.origin) {
		  corsEnabled(a.href) ? download(blob, name, opts) : click(a, a.target = '_blank');
		} else {
		  click(a);
		}
	  } else {
		// Support blobs
		a.href = URL.createObjectURL(blob);
		setTimeout(function () {
		  URL.revokeObjectURL(a.href);
		}, 4E4); // 40s
  
		setTimeout(function () {
		  click(a);
		}, 0);
	  }
	} // Use msSaveOrOpenBlob as a second approach
	: 'msSaveOrOpenBlob' in navigator ? function saveAs(blob, name, opts) {
	  name = name || blob.name || 'download';
  
	  if (typeof blob === 'string') {
		if (corsEnabled(blob)) {
		  download(blob, name, opts);
		} else {
		  var a = document.createElement('a');
		  a.href = blob;
		  a.target = '_blank';
		  setTimeout(function () {
			click(a);
		  });
		}
	  } else {
		navigator.msSaveOrOpenBlob(bom(blob, opts), name);
	  }
	} // Fallback to using FileReader and a popup
	: function saveAs(blob, name, opts, popup) {
	  // Open a popup immediately do go around popup blocker
	  // Mostly only available on user interaction and the fileReader is async so...
	  popup = popup || open('', '_blank');
  
	  if (popup) {
		popup.document.title = popup.document.body.innerText = 'downloading...';
	  }
  
	  if (typeof blob === 'string') return download(blob, name, opts);
	  var force = blob.type === 'application/octet-stream';
  
	  var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari;
  
	  var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent);
  
	  if ((isChromeIOS || force && isSafari || isMacOSWebView) && typeof FileReader !== 'undefined') {
		// Safari doesn't allow downloading of blob URLs
		var reader = new FileReader();
  
		reader.onloadend = function () {
		  var url = reader.result;
		  url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, 'data:attachment/file;');
		  if (popup) popup.location.href = url;else location = url;
		  popup = null; // reverse-tabnabbing #460
		};
  
		reader.readAsDataURL(blob);
	  } else {
		var URL = _global.URL || _global.webkitURL;
		var url = URL.createObjectURL(blob);
		if (popup) popup.location = url;else location.href = url;
		popup = null; // reverse-tabnabbing #460
  
		setTimeout(function () {
		  URL.revokeObjectURL(url);
		}, 4E4); // 40s
	  }
	});
	_global.saveAs = saveAs.saveAs = saveAs;
  
	if (typeof module !== 'undefined') {
	  module.exports = saveAs;
	}
  });