BookStack/resources/js/services/drawio.js

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JavaScript
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let iFrame = null;
let lastApprovedOrigin;
let onInit, onSave;
/**
* Show the draw.io editor.
* @param {String} drawioUrl
* @param {Function} onInitCallback - Must return a promise with the xml to load for the editor.
* @param {Function} onSaveCallback - Is called with the drawing data on save.
*/
function show(drawioUrl, onInitCallback, onSaveCallback) {
onInit = onInitCallback;
onSave = onSaveCallback;
iFrame = document.createElement('iframe');
iFrame.setAttribute('frameborder', '0');
window.addEventListener('message', drawReceive);
iFrame.setAttribute('src', drawioUrl);
iFrame.setAttribute('class', 'fullscreen');
iFrame.style.backgroundColor = '#FFFFFF';
document.body.appendChild(iFrame);
lastApprovedOrigin = (new URL(drawioUrl)).origin;
}
function close() {
drawEventClose();
}
/**
* Receive and handle a message event from the draw.io window.
* @param {MessageEvent} event
*/
function drawReceive(event) {
if (!event.data || event.data.length < 1) return;
if (event.origin !== lastApprovedOrigin) return;
const message = JSON.parse(event.data);
if (message.event === 'init') {
drawEventInit();
} else if (message.event === 'exit') {
drawEventClose();
} else if (message.event === 'save') {
drawEventSave(message);
} else if (message.event === 'export') {
drawEventExport(message);
}
}
function drawEventExport(message) {
if (onSave) {
onSave(message.data);
}
}
function drawEventSave(message) {
drawPostMessage({action: 'export', format: 'xmlpng', xml: message.xml, spin: 'Updating drawing'});
}
function drawEventInit() {
if (!onInit) return;
onInit().then(xml => {
drawPostMessage({action: 'load', autosave: 1, xml: xml});
});
}
function drawEventClose() {
window.removeEventListener('message', drawReceive);
if (iFrame) document.body.removeChild(iFrame);
}
function drawPostMessage(data) {
iFrame.contentWindow.postMessage(JSON.stringify(data), lastApprovedOrigin);
}
async function upload(imageData, pageUploadedToId) {
let data = {
image: imageData,
uploaded_to: pageUploadedToId,
};
const resp = await window.$http.post(window.baseUrl(`/images/drawio`), data);
return resp.data;
}
/**
* Load an existing image, by fetching it as Base64 from the system.
* @param drawingId
* @returns {Promise<string>}
*/
async function load(drawingId) {
const resp = await window.$http.get(window.baseUrl(`/images/drawio/base64/${drawingId}`));
return `data:image/png;base64,${resp.data.content}`;
}
export default {show, close, upload, load};