added importing and exporting of assets (images, pdfs, etc) to collection importer/exporter

1 files changed, 142 insertions, 0 deletions

diff --git a/src/JSZipUtils.js b/src/JSZipUtils.js
new file mode 100644
index 000000000..5ce1bd471
--- /dev/null
+++ b/src/JSZipUtils.js
@@ -0,0 +1,142 @@
+var JSZipUtils = {};
+// just use the responseText with xhr1, response with xhr2.
+// The transformation doesn't throw away high-order byte (with responseText)
+// because JSZip handles that case. If not used with JSZip, you may need to
+// do it, see https://developer.mozilla.org/En/Using_XMLHttpRequest#Handling_binary_data
+JSZipUtils._getBinaryFromXHR = function (xhr) {
+    // for xhr.responseText, the 0xFF mask is applied by JSZip
+    return xhr.response || xhr.responseText;
+};
+
+// taken from jQuery
+function createStandardXHR() {
+    try {
+        return new window.XMLHttpRequest();
+    } catch (e) {}
+}
+
+function createActiveXHR() {
+    try {
+        return new window.ActiveXObject('Microsoft.XMLHTTP');
+    } catch (e) {}
+}
+
+// Create the request object
+var createXHR =
+    typeof window !== 'undefined' && window.ActiveXObject
+        ? /* Microsoft failed to properly
+           * implement the XMLHttpRequest in IE7 (can't request local files),
+           * so we use the ActiveXObject when it is available
+           * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
+           * we need a fallback.
+           */
+          function () {
+              return createStandardXHR() || createActiveXHR();
+          }
+        : // For all other browsers, use the standard XMLHttpRequest object
+          createStandardXHR;
+
+/**
+ * @param  {string} path    The path to the resource to GET.
+ * @param  {function|{callback: function, progress: function}} options
+ * @return {Promise|undefined} If no callback is passed then a promise is returned
+ */
+JSZipUtils.getBinaryContent = function (path, options) {
+    var promise, resolve, reject;
+    var callback;
+
+    if (!options) {
+        options = {};
+    }
+
+    // backward compatible callback
+    if (typeof options === 'function') {
+        callback = options;
+        options = {};
+    } else if (typeof options.callback === 'function') {
+        // callback inside options object
+        callback = options.callback;
+    }
+
+    if (!callback && typeof Promise !== 'undefined') {
+        promise = new Promise(function (_resolve, _reject) {
+            resolve = _resolve;
+            reject = _reject;
+        });
+    } else {
+        resolve = function (data) {
+            callback(null, data);
+        };
+        reject = function (err) {
+            callback(err, null);
+        };
+    }
+
+    /*
+     * Here is the tricky part : getting the data.
+     * In firefox/chrome/opera/... setting the mimeType to 'text/plain; charset=x-user-defined'
+     * is enough, the result is in the standard xhr.responseText.
+     * cf https://developer.mozilla.org/En/XMLHttpRequest/Using_XMLHttpRequest#Receiving_binary_data_in_older_browsers
+     * In IE <= 9, we must use (the IE only) attribute responseBody
+     * (for binary data, its content is different from responseText).
+     * In IE 10, the 'charset=x-user-defined' trick doesn't work, only the
+     * responseType will work :
+     * http://msdn.microsoft.com/en-us/library/ie/hh673569%28v=vs.85%29.aspx#Binary_Object_upload_and_download
+     *
+     * I'd like to use jQuery to avoid this XHR madness, but it doesn't support
+     * the responseType attribute : http://bugs.jquery.com/ticket/11461
+     */
+    try {
+        var xhr = createXHR();
+
+        xhr.open('GET', path, true);
+
+        // recent browsers
+        if ('responseType' in xhr) {
+            xhr.responseType = 'arraybuffer';
+        }
+
+        // older browser
+        if (xhr.overrideMimeType) {
+            xhr.overrideMimeType('text/plain; charset=x-user-defined');
+        }
+
+        xhr.onreadystatechange = function (event) {
+            // use `xhr` and not `this`... thanks IE
+            if (xhr.readyState === 4) {
+                if (xhr.status === 200 || xhr.status === 0) {
+                    try {
+                        resolve(JSZipUtils._getBinaryFromXHR(xhr));
+                    } catch (err) {
+                        reject(new Error(err));
+                    }
+                } else {
+                    reject(new Error('Ajax error for ' + path + ' : ' + this.status + ' ' + this.statusText));
+                }
+            }
+        };
+
+        if (options.progress) {
+            xhr.onprogress = function (e) {
+                options.progress({
+                    path: path,
+                    originalEvent: e,
+                    percent: (e.loaded / e.total) * 100,
+                    loaded: e.loaded,
+                    total: e.total,
+                });
+            };
+        }
+
+        xhr.send();
+    } catch (e) {
+        reject(new Error(e), null);
+    }
+
+    // returns a promise or undefined depending on whether a callback was
+    // provided
+    return promise;
+};
+
+// export
+module.exports = JSZipUtils;