@lipagas/ember-core/addon/utils/download.js

Provides all the core services, decorators and utilities for building a Fleetbase extension for the Console.

import { later } from '@ember/runloop';

export default 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);
            };
            later(
                this,
                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
        }
    } else {
        //not data url, is it a string with special needs?
        if (/([\x80-\xff])/.test(payload)) {
            var i = 0,
                tempUiArr = new Uint8Array(payload.length),
                mx = tempUiArr.length;
            for (i; i < mx; ++i) tempUiArr[i] = payload.charCodeAt(i);
            payload = new myBlob([tempUiArr], { type: mimeType });
        }
    }
    blob = payload instanceof myBlob ? payload : new myBlob([payload], { type: mimeType });

    function dataUrlToBlob(strUrl) {
        var parts = strUrl.split(/[:;,]/),
            type = parts[1],
            indexDecoder = strUrl.indexOf('charset') > 0 ? 3 : 2,
            decoder = parts[indexDecoder] == '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';
            function handleClick(e) {
                e.stopPropagation();
                anchor.removeEventListener('click', handleClick);
            }
            anchor.addEventListener('click', handleClick);
            document.body.appendChild(anchor);
            later(
                this,
                function () {
                    anchor.click();
                    document.body.removeChild(anchor);
                    if (winMode === true) {
                        later(
                            this,
                            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)) {
            if (/^data:/.test(url)) url = 'data:' + 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 && /^data:/.test(url)) {
            // force a mime that will download:
            url = 'data:' + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
        }
        f.src = url;
        later(
            this,
            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 () {
            saver(this.result);
        };
        reader.readAsDataURL(blob);
    }
    return true;
}