X-Git-Url: http://source.bookstackapp.com/bookstack/blobdiff_plain/9135a85de4eef32a91c7a3ee0aa405ed454e5a4c..refs/pull/4467/head:/resources/js/services/drawio.js

diff --git a/resources/js/services/drawio.js b/resources/js/services/drawio.js
index 67ac4cc0e..46e10327a 100644
--- a/resources/js/services/drawio.js
+++ b/resources/js/services/drawio.js
@@ -1,29 +1,48 @@
+// Docs: https://www.diagrams.net/doc/faq/embed-mode
+import * as store from './store';
+
 let iFrame = null;
 let lastApprovedOrigin;
-let onInit, onSave;
+let onInit;
+let onSave;
+const saveBackupKey = 'last-drawing-save';
 
-/**
- * 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;
+function drawPostMessage(data) {
+    iFrame.contentWindow.postMessage(JSON.stringify(data), lastApprovedOrigin);
+}
 
-    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 drawEventExport(message) {
+    store.set(saveBackupKey, message.data);
+    if (onSave) {
+        onSave(message.data).then(() => {
+            store.del(saveBackupKey);
+        });
+    }
 }
 
-function close() {
-    drawEventClose();
+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});
+    });
+}
+
+function drawEventConfigure() {
+    const config = {};
+    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);
 }
 
 /**
@@ -48,53 +67,72 @@ function drawReceive(event) {
     }
 }
 
-function drawEventExport(message) {
-    if (onSave) {
-        onSave(message.data);
-    }
-}
+/**
+ * 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');
 
-function drawEventSave(message) {
-    drawPostMessage({action: 'export', format: 'xmlpng', xml: message.xml, spin: 'Updating drawing'});
-}
+    if (!dialogEl) {
+        console.error('Missing expected unsaved-drawing dialog');
+    }
 
-function drawEventInit() {
-    if (!onInit) return;
-    onInit().then(xml => {
-        drawPostMessage({action: 'load', autosave: 1, xml: xml});
-    });
+    if (backupVal) {
+        /** @var {ConfirmDialog} */
+        const dialog = window.$components.firstOnElement(dialogEl, 'confirm-dialog');
+        const restore = await dialog.show();
+        if (restore) {
+            onInit = async () => backupVal;
+        }
+    }
 }
 
-function drawEventConfigure() {
-    const config = {};
-    window.$events.emitPublic(iFrame, 'editor-drawio::configure', {config});
-    drawPostMessage({action: 'configure', config});
-}
+/**
+ * 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.
+ * @param {String} drawioUrl
+ * @param {Function<Promise<String>>} onInitCallback
+ * @param {Function<Promise>} onSaveCallback - Is called with the drawing data on save.
+ */
+export async function show(drawioUrl, onInitCallback, onSaveCallback) {
+    onInit = onInitCallback;
+    onSave = onSaveCallback;
 
-function drawEventClose() {
-    window.removeEventListener('message', drawReceive);
-    if (iFrame) document.body.removeChild(iFrame);
-}
+    await attemptRestoreIfExists();
 
-function drawPostMessage(data) {
-    iFrame.contentWindow.postMessage(JSON.stringify(data), lastApprovedOrigin);
+    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;
 }
 
-async function upload(imageData, pageUploadedToId) {
-    let data = {
+export async function upload(imageData, pageUploadedToId) {
+    const data = {
         image: imageData,
         uploaded_to: pageUploadedToId,
     };
-    const resp = await window.$http.post(window.baseUrl(`/images/drawio`), data);
+    const resp = await window.$http.post(window.baseUrl('/images/drawio'), data);
     return resp.data;
 }
 
+export function close() {
+    drawEventClose();
+}
+
 /**
  * Load an existing image, by fetching it as Base64 from the system.
  * @param drawingId
  * @returns {Promise<string>}
  */
-async function load(drawingId) {
+export async function load(drawingId) {
     try {
         const resp = await window.$http.get(window.baseUrl(`/images/drawio/base64/${drawingId}`));
         return `data:image/png;base64,${resp.data.content}`;
@@ -106,5 +144,3 @@ async function load(drawingId) {
         throw error;
     }
 }
-
-export default {show, close, upload, load};
\ No newline at end of file