Github user mike-jumper commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-client/pull/24#discussion_r68859917
--- Diff:
guacamole/src/main/webapp/app/clipboard/services/clipboardService.js ---
@@ -0,0 +1,409 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * A service for accessing local clipboard data.
+ */
+angular.module('clipboard').factory('clipboardService', ['$injector',
+ function clipboardService($injector) {
+
+ // Get required services
+ var $q = $injector.get('$q');
+ var $window = $injector.get('$window');
+
+ // Required types
+ var ClipboardData = $injector.get('ClipboardData');
+
+ var service = {};
+
+ /**
+ * Reference to the window.document object.
+ *
+ * @private
+ * @type HTMLDocument
+ */
+ var document = $window.document;
+
+ /**
+ * The textarea that will be used to hold the local clipboard contents.
+ *
+ * @type Element
+ */
+ var clipboardContent = document.createElement('div');
+
+ // Ensure clipboard target is selectable but not visible
+ clipboardContent.setAttribute('contenteditable', 'true');
+ clipboardContent.className = 'clipboard-service-target';
+
+ // Add clipboard target to DOM
+ document.body.appendChild(clipboardContent);
+
+ /**
+ * Stops the propogation of the given event through the DOM tree. This
is
+ * identical to invoking stopPropogation() on the event directly,
except
+ * that this function is usable as an event handler itself.
+ *
+ * @param {Event} e
+ * The event whose propogation through the DOM tree should be
stopped.
+ */
+ var stopEventPropagation = function stopEventPropagation(e) {
+ e.stopPropagation();
+ };
+
+ // Prevent events generated due to execCommand() from disturbing
external things
+ clipboardContent.addEventListener('copy', stopEventPropagation);
+ clipboardContent.addEventListener('paste', stopEventPropagation);
+
+ /**
+ * A stack of past node selection ranges. A range convering the nodes
+ * currently selected within the document can be pushed onto this stack
+ * with pushSelection(), and the most recently pushed selection can be
+ * popped off the stack (and thus re-selected) with popSelection().
+ *
+ * @type Range[]
+ */
+ var selectionStack = [];
+
+ /**
+ * Pushes the current selection range to the selection stack such that
it
+ * can later be restored with popSelection().
+ */
+ var pushSelection = function pushSelection() {
+
+ // Add a range representing the current selection to the stack
+ var selection = $window.getSelection();
+ if (selection.getRangeAt && selection.rangeCount)
+ selectionStack.push(selection.getRangeAt(0));
+
+ };
+
+ /**
+ * Pops a selection range off the selection stack restoring the
document's
+ * previous selection state. The selection range will be the most
recent
+ * selection range pushed by pushSelection(). If there are no selection
+ * ranges currently on the stack, this function has no effect.
+ */
+ var popSelection = function popSelection() {
+
+ // Pull one selection range from the stack
+ var range = selectionStack.pop();
+ if (!range)
+ return;
+
+ // Replace any current selection with the retrieved selection
+ var selection = $window.getSelection();
+ selection.removeAllRanges();
+ selection.addRange(range);
+
+ };
+
+ /**
+ * Selects all nodes within the given element. This will replace the
+ * current selection with a new selection range that covers the
element's
+ * contents. If the original selection should be preserved, use
+ * pushSelection() and popSelection().
+ *
+ * @param {Element} element
+ * The element whose contents should be selected.
+ */
+ var selectAll = function selectAll(element) {
+
+ // Generate a range which selects all nodes within the given
element
+ var range = document.createRange();
+ range.selectNodeContents(element);
+
+ // Replace any current selection with the generated range
+ var selection = $window.getSelection();
+ selection.removeAllRanges();
+ selection.addRange(range);
+
+ };
+
+ /**
+ * Modifies the contents of the given element such that it contains
only
+ * plain text. All non-text child elements will be stripped and
replaced
+ * with their text equivalents. As this function performs the
conversion
+ * through incremental changes only, cursor position within the given
+ * element is preserved.
+ *
+ * @param {Element} element
+ * The elements whose contents should be converted to plain text.
+ */
+ var convertToText = function convertToText(element) {
+
+ // For each child of the given element
+ var current = element.firstChild;
+ while (current) {
+
+ // Preserve the next child in the list, in case the current
+ // node is replaced
+ var next = current.nextSibling;
+
+ // If the child is not already a text node, replace it with its
+ // own text contents
+ if (current.nodeType !== Node.TEXT_NODE) {
+ var textNode =
document.createTextNode(current.textContent);
+ current.parentElement.replaceChild(textNode, current);
+ }
+
+ // Advance to next child
+ current = next;
+
+ }
+
+ };
+
+ /**
+ * Sets the local clipboard, if possible, to the given text.
+ *
+ * @param {ClipboardData} data
+ * The data to assign to the local clipboard should be set.
+ *
+ * @return {Promise}
+ * A promise that will resolve if setting the clipboard was
successful,
+ * and will reject if it failed.
+ */
+ service.setLocalClipboard = function setLocalClipboard(data) {
+
+ var deferred = $q.defer();
+
+ // Track the originally-focused element prior to changing focus
+ var originalElement = document.activeElement;
+ pushSelection();
+
+ // Copy the given value into the clipboard DOM element
+ if (typeof data.data === 'string')
+ clipboardContent.textContent = data.data;
+ else {
+ clipboardContent.innerHTML = '';
+ var img = document.createElement('img');
+ img.src = URL.createObjectURL(data.data);
+ clipboardContent.appendChild(img);
+ }
+
+ // Select all data within the clipboard target
+ selectAll(clipboardContent);
+
+ // Attempt to copy data from clipboard element into local clipboard
+ if (document.execCommand('copy'))
+ deferred.resolve();
+ else
+ deferred.reject();
+
+ // Unfocus the clipboard DOM event to avoid mobile keyboard
opening,
+ // restoring whichever element was originally focused
+ clipboardContent.blur();
+ originalElement.focus();
+ popSelection();
+
+ return deferred.promise;
+ };
+
+ /**
+ * Parses the given data URL, returning its decoded contents as a new
Blob.
+ * If the URL is not a valid data URL, null will be returned instead.
+ *
+ * @param {String} url
+ * The data URL to parse.
+ *
+ * @returns {Blob}
+ * A new Blob containing the decoded contents of the data URL, or
null
+ * if the URL is not a valid data URL.
+ */
+ service.parseDataURL = function parseDataURL(url) {
+
+ // Parse given string as a data URL
+ var result =
/^data:([^;]*);base64,([a-zA-Z0-9+/]*[=]*)$/.exec(url);
+ if (!result)
+ return null;
+
+ // Pull the mimetype and base64 contents of the data URL
+ var type = result[1];
+ var data = $window.atob(result[2]);
+
+ // Convert the decoded binary string into a typed array
+ var buffer = new Uint8Array(data.length);
+ for (var i = 0; i < data.length; i++)
+ buffer[i] = data.charCodeAt(i);
+
+ // Produce a proper blob containing the data and type provided in
+ // the data URL
+ return new Blob([buffer], { type : type });
+
+ };
+
+ /**
+ * Replaces the current text content of the given element with the
given
+ * text. To avoid affecting the position of the cursor within an
editable
+ * element, or firing unnecessary DOM modification events, the
underlying
+ * <code>textContent</code> property of the element is only touched if
+ * doing so would actually change the text.
+ *
+ * @param {Element} element
+ * The element whose text content should be changed.
+ *
+ * @param {String} text
+ * The text content to assign to the given element.
+ */
+ service.setTextContent = function setTextContent(element, text) {
+
+ // Strip out any non-text content while preserving cursor position
+ convertToText(element);
+
+ // Reset text content only if doing so will actually change the
content
+ if (element.textContent !== text)
+ element.textContent = text;
+
+ };
+
+ /**
+ * Returns the URL of the single image within the given element, if the
+ * element truly contains only one child and that child is an image.
If the
+ * content of the element is mixed or not an image, null is returned.
+ *
+ * @param {Element} element
+ * The element whose image content should be retrieved.
+ *
+ * @returns {String}
+ * The URL of the image contained within the given element, if that
+ * element contains only a single child element which happens to
be an
+ * image, or null if the content of the element is not purely an
image.
+ */
+ service.getImageContent = function getImageContent(element) {
+
+ // Return the source of the single child element, if it is an image
+ var firstChild = element.firstChild;
+ if (firstChild && firstChild.nodeName === 'IMG' &&
!firstChild.nextSibling)
+ return firstChild.getAttribute('src');
+
+ // Otherwise, the content of this element is not simply an image
+ return null;
+
+ };
+
+ /**
+ * Replaces the current contents of the given element with a single
image
+ * having the given URL. To avoid affecting the position of the cursor
+ * within an editable element, or firing unnecessary DOM modification
+ * events, the content of the element is only touched if doing so would
+ * actually change content.
+ *
+ * @param {Element} element
+ * The element whose image content should be changed.
+ *
+ * @param {String} url
+ * The URL of the image which should be assigned as the contents
of the
+ * given element.
+ */
+ service.setImageContent = function setImageContent(element, url) {
+
+ // Retrieve the URL of the current image contents, if any
+ var currentImage = service.getImageContent(element);
+
+ // If the current contents are not the given image (or not an image
+ // at all), reassign the contents
+ if (currentImage !== url) {
+
+ // Clear current contents
+ element.innerHTML = '';
+
+ // Add a new image as the sole contents of the element
+ var img = document.createElement('img');
+ img.src = url;
+ element.appendChild(img);
+
+ }
+
+ };
+
+ /**
+ * Get the current value of the local clipboard.
+ *
+ * @return {Promise.<ClipboardData>}
+ * A promise that will resolve with the contents of the local
clipboard
+ * if getting the clipboard was successful, and will reject if it
+ * failed.
+ */
+ service.getLocalClipboard = function getLocalClipboard() {
+
+ var deferred = $q.defer();
+
+ // Wait for the next event queue run before attempting to read
+ // clipboard data (in case the copy/cut has not yet completed)
+ $window.setTimeout(function deferredClipboardRead() {
+
+ // Track the originally-focused element prior to changing focus
+ var originalElement = document.activeElement;
+ pushSelection();
+
+ // Clear and select the clipboard DOM element
+ clipboardContent.innerHTML = '';
+ clipboardContent.focus();
+ selectAll(clipboardContent);
+
+ // Attempt paste local clipboard into clipboard DOM element
+ if (document.activeElement === clipboardContent &&
document.execCommand('paste')) {
+
+ // If the pasted data is a single image, resolve with a
blob
+ // containing that image
+ var currentImage =
service.getImageContent(clipboardContent);
+ if (currentImage) {
+
+ // Convert the image's data URL into a blob
+ var blob = service.parseDataURL(currentImage);
+ if (blob) {
+ deferred.resolve(new ClipboardData({
+ type : blob.type,
+ data : blob
+ }));
+ }
+
+ // Reject if conversion fails
+ else
+ deferred.reject();
+
+ } // end if clipboard is an image
+
+ // Otherwise, assume the clipboard contains plain text
+ else
+ deferred.resolve(new ClipboardData({
+ type : 'text/plain',
+ data : clipboardContent.textContent
+ }));
+
+ }
+
+ // Otherwise, reading from the clipboard has failed
+ else
+ deferred.reject();
+
+ // Unfocus the clipboard DOM event to avoid mobile keyboard
opening,
+ // restoring whichever element was originally focused
+ clipboardContent.blur();
+ originalElement.focus();
+ popSelection();
+
+ }, 100);
--- End diff --
OK.
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