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160 lines
5.8 KiB
Plaintext
160 lines
5.8 KiB
Plaintext
11 months ago
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//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage
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// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
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// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
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// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.
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// v4 adds AMD/UMD, commonJS, and plain browser support
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// v4.1 adds url download capability via solo URL argument (same domain/CORS only)
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// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
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// https://github.com/rndme/download
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define([], factory);
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} else if (typeof exports === 'object') {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory();
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} else {
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// Browser globals (root is window)
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root.download = factory();
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}
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}(this, function () {
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return function download(data, strFileName, strMimeType) {
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var self = window, // this script is only for browsers anyway...
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defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
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mimeType = strMimeType || defaultMime,
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payload = DealText(data),
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url = !strFileName && !strMimeType && payload,
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anchor = document.createElement("a"),
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toString = function (a) { return String(a); },
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myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
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fileName = strFileName || "download",
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blob,
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reader;
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myBlob = myBlob.call ? myBlob.bind(self) : Blob;
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if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
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payload = [payload, mimeType];
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mimeType = payload[0];
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payload = payload[1];
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}
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//if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument
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// fileName = url.split("/").pop().split("?")[0];
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// anchor.href = url; // assign href prop to temp anchor
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// if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it's a potentially valid url path:
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// var ajax = new XMLHttpRequest();
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// ajax.open("GET",DealText( url), true);
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// ajax.responseType = 'blob';
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// ajax.onload = function (e) {
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// download(e.target.response, fileName, defaultMime);
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// };
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// setTimeout(function () { ajax.send(); }, 0); // allows setting custom ajax headers using the return:
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// return ajax;
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// } // end if valid url?
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//} // end if url?
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//go ahead and download dataURLs right away
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if (/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)) {
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if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {
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payload = dataUrlToBlob(payload);
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mimeType = payload.type || defaultMime;
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} else {
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return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
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navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
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saver(payload); // everyone else can save dataURLs un-processed
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}
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}//end if dataURL passed?
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blob = new myBlob([payload], { type: mimeType });
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function dataUrlToBlob(strUrl) {
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var parts = strUrl.split(/[:;,]/),
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type = parts[1],
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decoder = parts[2] == "base64" ? atob : decodeURIComponent,
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binData = decoder(parts.pop()),
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mx = binData.length,
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i = 0,
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uiArr = new Uint8Array(mx);
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for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);
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return new myBlob([uiArr], { type: type });
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}
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function saver(url, winMode) {
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if ('download' in anchor) { //html5 A[download]
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anchor.href = url;
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anchor.setAttribute("download", fileName);
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anchor.className = "download-js-link";
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anchor.innerHTML = "downloading...";
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anchor.style.display = "none";
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document.body.appendChild(anchor);
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setTimeout(function () {
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anchor.click();
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document.body.removeChild(anchor);
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if (winMode === true) { setTimeout(function () { self.URL.revokeObjectURL(anchor.href); }, 250); }
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}, 66);
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return true;
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}
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// handle non-a[download] safari as best we can:
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//if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
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// url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
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// if (!window.open(url)) { // popup blocked, offer direct download:
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// if (confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")) { location.href = url; }
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// }
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// return true;
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//}
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////do iframe dataURL download (old ch+FF):
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//var f = document.createElement("iframe");
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//document.body.appendChild(f);
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//if (!winMode) { // force a mime that will download:
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// url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
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//}
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//f.src = url;
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//setTimeout(function () { document.body.removeChild(f); }, 333);
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}//end saver
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if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
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return navigator.msSaveBlob(blob, fileName);
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}
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if (self.URL) { // simple fast and modern way using Blob and URL:
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saver(self.URL.createObjectURL(blob), true);
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} else {
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// handle non-Blob()+non-URL browsers:
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//if (typeof blob === "string" || blob.constructor === toString) {
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// try {
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// return saver("data:" + mimeType + ";base64," + self.btoa(blob));
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// } catch (y) {
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// return saver("data:" + mimeType + "," + encodeURIComponent(blob));
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// }
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//}
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//// Blob but not URL support:
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//reader = new FileReader();
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//reader.onload = function (e) {
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// saver(this.result);
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//};
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//reader.readAsDataURL(blob);
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}
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return true;
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}; /* end download() */
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}));
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