Phraseanet/resources/www/common/js/components/download.js

//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage
// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
// 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.
// v4 adds AMD/UMD, commonJS, and plain browser support
// v4.1 adds url download capability via solo URL argument (same domain/CORS only)
// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
// https://github.com/rndme/download

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define([], factory);
    } else if (typeof exports === 'object') {
        // Node. Does not work with strict CommonJS, but
        // only CommonJS-like environments that support module.exports,
        // like Node.
        module.exports = factory();
    } else {
        // Browser globals (root is window)
        root.download = factory();
    }
}(this, function () {

    return function download(data, strFileName, strMimeType) {

        var self = window, // this script is only for browsers anyway...
            defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
            mimeType = strMimeType || defaultMime,
            payload = data,
            url = !strFileName && !strMimeType && payload,
            anchor = document.createElement("a"),
            toString = function (a) {
                return String(a);
            },
            myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
            fileName = strFileName || "download",
            blob,
            reader;
        myBlob = myBlob.call ? myBlob.bind(self) : Blob;

        if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
            payload = [payload, mimeType];
            mimeType = payload[0];
            payload = payload[1];
        }


        if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument
            fileName = url.split("/").pop().split("?")[0];
            anchor.href = url; // assign href prop to temp anchor
            if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it's a potentially valid url path:
                var ajax = new XMLHttpRequest();
                ajax.open("GET", url, true);
                ajax.responseType = 'blob';
                ajax.onload = function (e) {
                    download(e.target.response, fileName, defaultMime);
                };
                setTimeout(function () {
                    ajax.send();
                }, 0); // allows setting custom ajax headers using the return:
                return ajax;
            } // end if valid url?
        } // end if url?


        //go ahead and download dataURLs right away
        if (/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)) {

            if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {
                payload = dataUrlToBlob(payload);
                mimeType = payload.type || defaultMime;
            } else {
                return navigator.msSaveBlob ?  // IE10 can't do a[download], only Blobs:
                    navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
                    saver(payload); // everyone else can save dataURLs un-processed
            }

        }//end if dataURL passed?

        blob = payload instanceof myBlob ?
            payload :
            new myBlob([payload], {type: mimeType});


        function dataUrlToBlob(strUrl) {
            var parts = strUrl.split(/[:;,]/),
                type = parts[1],
                decoder = parts[2] == "base64" ? atob : decodeURIComponent,
                binData = decoder(parts.pop()),
                mx = binData.length,
                i = 0,
                uiArr = new Uint8Array(mx);

            for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);

            return new myBlob([uiArr], {type: type});
        }

        function saver(url, winMode) {

            if ('download' in anchor) { //html5 A[download]
                anchor.href = url;
                anchor.setAttribute("download", fileName);
                anchor.className = "download-js-link";
                anchor.innerHTML = "downloading...";
                anchor.style.display = "none";
                document.body.appendChild(anchor);
                setTimeout(function () {
                    anchor.click();
                    document.body.removeChild(anchor);
                    if (winMode === true) {
                        setTimeout(function () {
                            self.URL.revokeObjectURL(anchor.href);
                        }, 250);
                    }
                }, 66);
                return true;
            }

            // handle non-a[download] safari as best we can:
            if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
                url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
                if (!window.open(url)) { // popup blocked, offer direct download:
                    if (confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")) {
                        location.href = url;
                    }
                }
                return true;
            }

            //do iframe dataURL download (old ch+FF):
            var f = document.createElement("iframe");
            document.body.appendChild(f);

            if (!winMode) { // force a mime that will download:
                url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
            }
            f.src = url;
            setTimeout(function () {
                document.body.removeChild(f);
            }, 333);

        }//end saver


        if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
            return navigator.msSaveBlob(blob, fileName);
        }

        if (self.URL) { // simple fast and modern way using Blob and URL:
            saver(self.URL.createObjectURL(blob), true);
        } else {
            // handle non-Blob()+non-URL browsers:
            if (typeof blob === "string" || blob.constructor === toString) {
                try {
                    return saver("data:" + mimeType + ";base64," + self.btoa(blob));
                } catch (y) {
                    return saver("data:" + mimeType + "," + encodeURIComponent(blob));
                }
            }

            // Blob but not URL support:
            reader = new FileReader();
            reader.onload = function (e) {
                saver(this.result);
            };
            reader.readAsDataURL(blob);
        }
        return true;
    };
    /* end download() */
}));