BookStack/resources/js/services/drawio.ts

159 lines
4.8 KiB
TypeScript
Raw Normal View History

// Docs: https://www.diagrams.net/doc/faq/embed-mode
import * as store from './store';
import {ConfirmDialog} from "../components";
2024-07-18 22:13:14 +08:00
import {HttpError} from "./http";
type DrawioExportEventResponse = {
action: 'export',
format: string,
message: string,
data: string,
xml: string,
};
type DrawioSaveEventResponse = {
action: 'save',
xml: string,
};
let iFrame: HTMLIFrameElement|null = null;
let lastApprovedOrigin: string;
let onInit: () => Promise<string>;
let onSave: (data: string) => Promise<any>;
const saveBackupKey = 'last-drawing-save';
function drawPostMessage(data: Record<any, any>): void {
iFrame?.contentWindow?.postMessage(JSON.stringify(data), lastApprovedOrigin);
}
function drawEventExport(message: DrawioExportEventResponse) {
store.set(saveBackupKey, message.data);
if (onSave) {
onSave(message.data).then(() => {
store.del(saveBackupKey);
});
}
}
function drawEventSave(message: DrawioSaveEventResponse) {
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});
});
}
function drawEventConfigure() {
const config = {};
if (iFrame) {
window.$events.emitPublic(iFrame, 'editor-drawio::configure', {config});
drawPostMessage({action: 'configure', config});
}
}
function drawEventClose() {
// eslint-disable-next-line no-use-before-define
window.removeEventListener('message', drawReceive);
if (iFrame) document.body.removeChild(iFrame);
}
/**
* Receive and handle a message event from the draw.io window.
*/
function drawReceive(event: MessageEvent) {
if (!event.data || event.data.length < 1) return;
if (event.origin !== lastApprovedOrigin) return;
const message = JSON.parse(event.data);
if (message.event === 'init') {
drawEventInit();
} else if (message.event === 'exit') {
drawEventClose();
} else if (message.event === 'save') {
drawEventSave(message as DrawioSaveEventResponse);
} else if (message.event === 'export') {
drawEventExport(message as DrawioExportEventResponse);
} else if (message.event === 'configure') {
drawEventConfigure();
}
}
/**
* Attempt to prompt and restore unsaved drawing content if existing.
* @returns {Promise<void>}
*/
async function attemptRestoreIfExists() {
const backupVal = await store.get(saveBackupKey);
const dialogEl = document.getElementById('unsaved-drawing-dialog');
if (!dialogEl) {
console.error('Missing expected unsaved-drawing dialog');
}
if (backupVal && dialogEl) {
const dialog = window.$components.firstOnElement(dialogEl, 'confirm-dialog') as ConfirmDialog;
const restore = await dialog.show();
if (restore) {
onInit = async () => backupVal;
}
}
}
/**
* Show the draw.io editor.
* onSaveCallback must return a promise that resolves on successful save and errors on failure.
* onInitCallback must return a promise with the xml to load for the editor.
* Will attempt to provide an option to restore unsaved changes if found to exist.
* onSaveCallback Is called with the drawing data on save.
*/
export async function show(drawioUrl: string, onInitCallback: () => Promise<string>, onSaveCallback: (data: string) => Promise<void>): Promise<void> {
onInit = onInitCallback;
onSave = onSaveCallback;
await attemptRestoreIfExists();
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;
}
export async function upload(imageData: string, pageUploadedToId: string): Promise<{id: number, url: string}> {
const data = {
image: imageData,
uploaded_to: pageUploadedToId,
};
const resp = await window.$http.post(window.baseUrl('/images/drawio'), data);
return resp.data as {id: number, url: string};
}
export function close() {
drawEventClose();
}
/**
* Load an existing image, by fetching it as Base64 from the system.
*/
export async function load(drawingId: string): Promise<string> {
try {
const resp = await window.$http.get(window.baseUrl(`/images/drawio/base64/${drawingId}`));
2024-07-18 22:13:14 +08:00
const data = resp.data as {content: string};
return `data:image/png;base64,${data.content}`;
} catch (error) {
2024-07-18 22:13:14 +08:00
if (error instanceof HttpError) {
window.$events.showResponseError(error);
}
close();
throw error;
}
}