js-file-downloader
Version:
Small lib for a cool download experience
552 lines (534 loc) • 39.5 kB
JavaScript
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/***/ "./src/exception.js":
/*!**************************!*\
!*** ./src/exception.js ***!
\**************************/
/*! exports provided: DownloadException, downloadException */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
;
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "DownloadException", function() { return DownloadException; });
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "downloadException", function() { return downloadException; });
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var DownloadException = /*#__PURE__*/function (_Error) {
_inherits(DownloadException, _Error);
var _super = _createSuper(DownloadException);
function DownloadException(message, request) {
var _this;
_classCallCheck(this, DownloadException);
_this = _super.call(this, "Downloader error: ".concat(message));
_this.request = request;
_this.name = 'DownloadException';
return _this;
}
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;
/**
* @deprecated use DownloadException instead, it will be removed in next releases!
*/
var downloadException = DownloadException;
/***/ }),
/***/ "./src/index.js":
/*!**********************!*\
!*** ./src/index.js ***!
\**********************/
/*! exports provided: default */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
;
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _exception__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./exception */ "./src/exception.js");
/* harmony import */ var _signatures__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./signatures */ "./src/signatures.js");
/*!
* JS File Downloader v 1.1.25
* https://github.com/AleeeKoi/js-file-downloader
*
* Copyright Alessandro Pellizzari
* Released under the MIT license
* http://opensource.org/licenses/MIT
*/
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function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
var DEFAULT_PARAMS = {
timeout: 40000,
headers: [],
forceDesktopMode: false,
autoStart: true,
withCredentials: false,
method: 'GET',
nameCallback: function nameCallback(name) {
return name;
},
contentType: 'application/x-www-form-urlencoded',
body: null,
nativeFallbackOnError: false,
contentTypeDetermination: false
};
var JsFileDownloader = /*#__PURE__*/function () {
/**
* Create a new JsFileDownloader instance
* You need to define a {String} "url" params and other
* @param {Object} customParams
*/
function JsFileDownloader() {
var customParams = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
_classCallCheck(this, JsFileDownloader);
this.params = Object.assign({}, DEFAULT_PARAMS, customParams);
this.link = this.createLink();
this.request = null;
this.downloadedFile = null;
this.abortController = undefined;
if (this.params.autoStart) return this.downloadFile();
return this;
}
_createClass(JsFileDownloader, [{
key: "start",
value: function start() {
return this.downloadFile();
}
}, {
key: "abort",
value: function abort(reason) {
if (!this.abortController) {
return;
}
this.abortController.abort(reason || 'Download cancelled');
}
}, {
key: "downloadFile",
value: function downloadFile() {
var _this = this;
return new Promise(function (resolve, reject) {
_this.initDownload(resolve, reject);
});
}
}, {
key: "setAbortListner",
value: function setAbortListner(abortListener) {
if (!this.abortController) {
return;
}
this.abortController.signal.addEventListener('abort', abortListener);
}
}, {
key: "unsetAbortListner",
value: function unsetAbortListner(abortListener) {
if (!this.abortController) {
return;
}
this.abortController.signal.removeEventListener('abort', abortListener);
}
}, {
key: "initDownload",
value: function initDownload(resolve, reject) {
var _this2 = this;
var fallback = function fallback() {
_this2.link.target = '_blank';
_this2.link.href = _this2.params.url;
_this2.clickLink();
};
// fallback for old browsers
if (!('download' in this.link) || this.isMobile()) {
fallback();
return resolve();
}
this.request = this.createRequest();
this.abortController = 'AbortController' in window ? new AbortController() : null;
var abortListener = function abortListener(_ref) {
var target = _ref.target;
_this2.unsetAbortListner(abortListener);
!!_this2.request && _this2.request.abort();
reject(target.reason);
};
this.setAbortListner(abortListener);
if (!this.params.url) {
return reject(new _exception__WEBPACK_IMPORTED_MODULE_0__["DownloadException"]('url param not defined!', this.request));
}
this.request.onload = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee() {
return _regeneratorRuntime().wrap(function _callee$(_context) {
while (1) switch (_context.prev = _context.next) {
case 0:
_this2.unsetAbortListner(abortListener);
if (!(parseInt(_this2.request.status, 10) !== 200)) {
_context.next = 3;
break;
}
return _context.abrupt("return", reject(new _exception__WEBPACK_IMPORTED_MODULE_0__["DownloadException"]("status code [".concat(_this2.request.status, "]"), _this2.request)));
case 3:
_context.next = 5;
return _this2.startDownload();
case 5:
return _context.abrupt("return", resolve(_this2));
case 6:
case "end":
return _context.stop();
}
}, _callee);
}));
this.request.ontimeout = function () {
_this2.unsetAbortListner(abortListener);
reject(new _exception__WEBPACK_IMPORTED_MODULE_0__["DownloadException"]('request timeout', _this2.request));
};
this.request.onerror = function () {
_this2.unsetAbortListner(abortListener);
if (_this2.params.nativeFallbackOnError) {
fallback();
resolve(_this2);
} else {
reject(new _exception__WEBPACK_IMPORTED_MODULE_0__["DownloadException"]('network error', _this2.request));
}
};
this.request.send(this.params.body);
return this;
}
}, {
key: "isMobile",
value: function isMobile() {
return !this.params.forceDesktopMode && /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
}
}, {
key: "createRequest",
value: function createRequest() {
var request = new XMLHttpRequest();
request.open(this.params.method, this.params.url, true);
if (this.params.contentType !== false) {
request.setRequestHeader('Content-type', this.params.contentType);
}
this.params.headers.forEach(function (header) {
request.setRequestHeader(header.name, header.value);
});
request.responseType = 'arraybuffer';
if (this.params.process && typeof this.params.process === 'function') {
request.addEventListener('progress', this.params.process);
}
if (this.params.onloadstart && typeof this.params.onloadstart === 'function') {
request.onloadstart = this.params.onloadstart;
}
request.timeout = this.params.timeout;
request.withCredentials = !!this.params.withCredentials || !!this.params.includeCredentials;
return request;
}
}, {
key: "getFileName",
value: function getFileName() {
// Forcing file name
if (typeof this.params.filename === 'string') {
return this.params.filename;
}
// Trying to get file name from response header
var content = this.request.getResponseHeader('Content-Disposition');
var contentParts = [];
if (content) {
contentParts = content.replace(/["']/g, '').match(/filename\*?=([^;]+)/);
}
var extractedName = contentParts && contentParts.length >= 1 ? contentParts[1] : this.params.url.split('/').pop().split('?')[0];
return this.params.nameCallback(extractedName);
}
}, {
key: "getContentTypeFromFileSignature",
value: function getContentTypeFromFileSignature(file) {
var signatures = Object.assign({}, _signatures__WEBPACK_IMPORTED_MODULE_1__["fileSignatures"], this.params.customFileSignatures);
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var first4BytesOfFile = file.slice(0, 4);
reader.onloadend = function (evt) {
if (evt.target.readyState !== FileReader.DONE) {
reject();
return;
}
// Since an array buffer is just a generic way to represent a binary buffer
// we need to create a TypedArray, in this case an Uint8Array
var uint = new Uint8Array(evt.target.result);
var bytes = [];
uint.forEach(function (byte) {
// transform every byte to hexadecimal
bytes.push(byte.toString(16));
});
var hex = bytes.join('').toUpperCase();
resolve(signatures[hex]);
};
reader.onerror = reject;
// read first 4 bytes of sliced file as an array buffer
reader.readAsArrayBuffer(first4BytesOfFile);
});
}
}, {
key: "getContentTypeFromResponseHeader",
value: function getContentTypeFromResponseHeader() {
return this.request.getResponseHeader('content-type');
}
}, {
key: "getContentType",
value: function getContentType(response) {
var _this3 = this;
return new Promise( /*#__PURE__*/function () {
var _ref3 = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee2(resolve) {
var contentTypeDetermination, defaultContentType, headerContentType, signatureContentType, _headerContentType, _signatureContentType, _ref4, _signatureContentType2;
return _regeneratorRuntime().wrap(function _callee2$(_context2) {
while (1) switch (_context2.prev = _context2.next) {
case 0:
contentTypeDetermination = _this3.params.contentTypeDetermination;
defaultContentType = 'application/octet-stream';
if (contentTypeDetermination === 'header' || contentTypeDetermination === 'full') {
headerContentType = _this3.getContentTypeFromResponseHeader();
}
if (!(contentTypeDetermination === 'signature' || contentTypeDetermination === 'full')) {
_context2.next = 7;
break;
}
_context2.next = 6;
return _this3.getContentTypeFromFileSignature(new Blob([response]));
case 6:
signatureContentType = _context2.sent;
case 7:
if (contentTypeDetermination === 'header') {
resolve((_headerContentType = headerContentType) !== null && _headerContentType !== void 0 ? _headerContentType : defaultContentType);
} else if (contentTypeDetermination === 'signature') {
resolve((_signatureContentType = signatureContentType) !== null && _signatureContentType !== void 0 ? _signatureContentType : defaultContentType);
} else if (contentTypeDetermination === 'full') {
resolve((_ref4 = (_signatureContentType2 = signatureContentType) !== null && _signatureContentType2 !== void 0 ? _signatureContentType2 : headerContentType) !== null && _ref4 !== void 0 ? _ref4 : defaultContentType);
} else {
resolve(defaultContentType);
}
case 8:
case "end":
return _context2.stop();
}
}, _callee2);
}));
return function (_x) {
return _ref3.apply(this, arguments);
};
}());
}
}, {
key: "createLink",
value: function createLink() {
var link = document.createElement('a');
link.style.display = 'none';
return link;
}
}, {
key: "clickLink",
value: function clickLink() {
var event;
try {
event = new MouseEvent('click');
} catch (e) {
event = document.createEvent('MouseEvent');
event.initMouseEvent('click', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
}
this.link.dispatchEvent(event);
}
}, {
key: "getFile",
value: function () {
var _getFile = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee3(response, fileName) {
var type, file, options;
return _regeneratorRuntime().wrap(function _callee3$(_context3) {
while (1) switch (_context3.prev = _context3.next) {
case 0:
_context3.next = 2;
return this.getContentType(response);
case 2:
type = _context3.sent;
options = {
type: type
};
try {
file = new File([response], fileName, options);
} catch (e) {
file = new Blob([response], options);
file.name = fileName;
file.lastModifiedDate = new Date();
}
return _context3.abrupt("return", file);
case 6:
case "end":
return _context3.stop();
}
}, _callee3, this);
}));
function getFile(_x2, _x3) {
return _getFile.apply(this, arguments);
}
return getFile;
}()
}, {
key: "startDownload",
value: function () {
var _startDownload = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee4() {
var fileName, objectUrl;
return _regeneratorRuntime().wrap(function _callee4$(_context4) {
while (1) switch (_context4.prev = _context4.next) {
case 0:
fileName = this.getFileName();
_context4.next = 3;
return this.getFile(this.request.response, fileName);
case 3:
this.downloadedFile = _context4.sent;
if (!('msSaveOrOpenBlob' in window.navigator)) {
_context4.next = 6;
break;
}
return _context4.abrupt("return", window.navigator.msSaveOrOpenBlob(this.downloadedFile, fileName));
case 6:
objectUrl = window.URL.createObjectURL(this.downloadedFile);
this.link.href = objectUrl;
this.link.download = fileName;
this.clickLink();
setTimeout(function () {
(window.URL || window.webkitURL || window).revokeObjectURL(objectUrl);
}, 1000 * 40);
return _context4.abrupt("return", this.downloadedFile);
case 12:
case "end":
return _context4.stop();
}
}, _callee4, this);
}));
function startDownload() {
return _startDownload.apply(this, arguments);
}
return startDownload;
}()
}]);
return JsFileDownloader;
}();
/* harmony default export */ __webpack_exports__["default"] = (JsFileDownloader);
/***/ }),
/***/ "./src/signatures.js":
/*!***************************!*\
!*** ./src/signatures.js ***!
\***************************/
/*! exports provided: fileSignatures */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
;
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "fileSignatures", function() { return fileSignatures; });
var fileSignatures = {
'89504E47': 'image/png',
'25504446': 'application/pdf'
};
/***/ })
/******/ })["default"];
});
//# sourceMappingURL=js-file-downloader.js.map