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feat: Add onExportToBackend prop so host can handle it (#2612)

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Co-authored-by: dwelle <luzar.david@gmail.com>
pull/2608/head^2
Aakansha Doshi 4 years ago committed by GitHub
parent b917e42694
commit 325d1bec91
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GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 164 additions and 117 deletions
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2
scripts/changelog-check.js
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@ -8,7 +8,7 @@ const changeLogCheck = () => {
process.exit(1);
}
if (!stdout || stdout.includes("packages/excalidraw/CHANGELOG.MD")) {
if (!stdout || stdout.includes("packages/excalidraw/CHANGELOG.md")) {
process.exit(0);
}

3
src/components/App.tsx
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@ -345,7 +345,7 @@ class App extends React.Component<ExcalidrawProps, AppState> {
offsetLeft,
} = this.state;
const { onCollabButtonClick } = this.props;
const { onCollabButtonClick, onExportToBackend } = this.props;
const canvasScale = window.devicePixelRatio;
const canvasWidth = canvasDOMWidth * canvasScale;
@ -384,6 +384,7 @@ class App extends React.Component<ExcalidrawProps, AppState> {
toggleZenMode={this.toggleZenMode}
lng={getLanguage().lng}
isCollaborating={this.props.isCollaborating || false}
onExportToBackend={onExportToBackend}
/>
{this.state.showStats && (
<Stats

20
src/components/ExportDialog.tsx
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@ -67,7 +67,7 @@ const ExportModal = ({
onExportToPng: ExportCB;
onExportToSvg: ExportCB;
onExportToClipboard: ExportCB;
onExportToBackend: ExportCB;
onExportToBackend?: ExportCB;
onCloseRequest: () => void;
}) => {
const someElementIsSelected = isSomeElementSelected(elements, appState);
@ -155,13 +155,15 @@ const ExportModal = ({
onClick={() => onExportToClipboard(exportedElements, scale)}
/>
)}
<ToolButton
type="button"
icon={link}
title={t("buttons.getShareableLink")}
aria-label={t("buttons.getShareableLink")}
onClick={() => onExportToBackend(exportedElements)}
/>
{onExportToBackend && (
<ToolButton
type="button"
icon={link}
title={t("buttons.getShareableLink")}
aria-label={t("buttons.getShareableLink")}
onClick={() => onExportToBackend(exportedElements)}
/>
)}
</Stack.Row>
<div className="ExportDialog__name">
{actionManager.renderAction("changeProjectName")}
@ -235,7 +237,7 @@ export const ExportDialog = ({
onExportToPng: ExportCB;
onExportToSvg: ExportCB;
onExportToClipboard: ExportCB;
onExportToBackend: ExportCB;
onExportToBackend?: ExportCB;
}) => {
const [modalIsShown, setModalIsShown] = useState(false);
const triggerButton = useRef<HTMLButtonElement>(null);

35
src/components/LayerUI.tsx
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@ -65,6 +65,11 @@ interface LayerUIProps {
toggleZenMode: () => void;
lng: string;
isCollaborating: boolean;
onExportToBackend?: (
exportedElements: readonly NonDeletedExcalidrawElement[],
appState: AppState,
canvas: HTMLCanvasElement | null,
) => void;
}
const useOnClickOutside = (
@ -317,6 +322,7 @@ const LayerUI = ({
zenModeEnabled,
toggleZenMode,
isCollaborating,
onExportToBackend,
}: LayerUIProps) => {
const isMobile = useIsMobile();
@ -358,6 +364,7 @@ const LayerUI = ({
});
}
};
return (
<ExportDialog
elements={elements}
@ -366,28 +373,14 @@ const LayerUI = ({
onExportToPng={createExporter("png")}
onExportToSvg={createExporter("svg")}
onExportToClipboard={createExporter("clipboard")}
onExportToBackend={async (exportedElements) => {
if (canvas) {
try {
await exportCanvas(
"backend",
exportedElements,
{
...appState,
selectedElementIds: {},
},
canvas,
appState,
);
} catch (error) {
if (error.name !== "AbortError") {
const { width, height } = canvas;
console.error(error, { width, height });
setAppState({ errorMessage: error.message });
onExportToBackend={
onExportToBackend
? (elements) => {
onExportToBackend &&
onExportToBackend(elements, appState, canvas);
}
}
}
}}
: undefined
}
/>
);
};

72
src/data/index.ts
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@ -1,14 +1,10 @@
import { fileSave } from "browser-nativefs";
import { EVENT_IO, trackEvent } from "../analytics";
import { getDefaultAppState } from "../appState";
import {
copyCanvasToClipboardAsPng,
copyTextToSystemClipboard,
} from "../clipboard";
import {
ExcalidrawElement,
NonDeletedExcalidrawElement,
} from "../element/types";
import { NonDeletedExcalidrawElement } from "../element/types";
import { t } from "../i18n";
import { exportToCanvas, exportToSvg } from "../scene/export";
import { ExportType } from "../scene/types";
@ -19,65 +15,6 @@ import { serializeAsJSON } from "./json";
export { loadFromBlob } from "./blob";
export { loadFromJSON, saveAsJSON } from "./json";
const BACKEND_V2_POST = process.env.REACT_APP_BACKEND_V2_POST_URL;
export const exportToBackend = async (
elements: readonly ExcalidrawElement[],
appState: AppState,
) => {
const json = serializeAsJSON(elements, appState);
const encoded = new TextEncoder().encode(json);
const key = await window.crypto.subtle.generateKey(
{
name: "AES-GCM",
length: 128,
},
true, // extractable
["encrypt", "decrypt"],
);
// The iv is set to 0. We are never going to reuse the same key so we don't
// need to have an iv. (I hope that's correct...)
const iv = new Uint8Array(12);
// We use symmetric encryption. AES-GCM is the recommended algorithm and
// includes checks that the ciphertext has not been modified by an attacker.
const encrypted = await window.crypto.subtle.encrypt(
{
name: "AES-GCM",
iv,
},
key,
encoded,
);
// We use jwk encoding to be able to extract just the base64 encoded key.
// We will hardcode the rest of the attributes when importing back the key.
const exportedKey = await window.crypto.subtle.exportKey("jwk", key);
try {
const response = await fetch(BACKEND_V2_POST, {
method: "POST",
body: encrypted,
});
const json = await response.json();
if (json.id) {
const url = new URL(window.location.href);
// We need to store the key (and less importantly the id) as hash instead
// of queryParam in order to never send it to the server
url.hash = `json=${json.id},${exportedKey.k!}`;
const urlString = url.toString();
window.prompt(`🔒${t("alerts.uploadedSecurly")}`, urlString);
trackEvent(EVENT_IO, "export", "backend");
} else if (json.error_class === "RequestTooLargeError") {
window.alert(t("alerts.couldNotCreateShareableLinkTooBig"));
} else {
window.alert(t("alerts.couldNotCreateShareableLink"));
}
} catch (error) {
console.error(error);
window.alert(t("alerts.couldNotCreateShareableLink"));
}
};
export const exportCanvas = async (
type: ExportType,
elements: readonly NonDeletedExcalidrawElement[],
@ -169,13 +106,6 @@ export const exportCanvas = async (
}
throw new Error(t("alerts.couldNotCopyToClipboard"));
}
} else if (type === "backend") {
exportToBackend(elements, {
...appState,
viewBackgroundColor: exportBackground
? appState.viewBackgroundColor
: getDefaultAppState().viewBackgroundColor,
});
}
// clean up the DOM

61
src/excalidraw-app/data/index.ts
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@ -3,12 +3,14 @@ import { ExcalidrawElement } from "../../element/types";
import { AppState } from "../../types";
import { ImportedDataState } from "../../data/types";
import { restore } from "../../data/restore";
import { EVENT_ACTION, trackEvent } from "../../analytics";
import { EVENT_ACTION, EVENT_IO, trackEvent } from "../../analytics";
import { serializeAsJSON } from "../../data/json";
const byteToHex = (byte: number): string => `0${byte.toString(16)}`.slice(-2);
const BACKEND_GET = process.env.REACT_APP_BACKEND_V1_GET_URL;
const BACKEND_V2_GET = process.env.REACT_APP_BACKEND_V2_GET_URL;
const BACKEND_V2_POST = process.env.REACT_APP_BACKEND_V2_POST_URL;
const generateRandomID = async () => {
const arr = new Uint8Array(10);
@ -228,3 +230,60 @@ export const loadScene = async (
commitToHistory: false,
};
};
export const exportToBackend = async (
elements: readonly ExcalidrawElement[],
appState: AppState,
) => {
const json = serializeAsJSON(elements, appState);
const encoded = new TextEncoder().encode(json);
const key = await window.crypto.subtle.generateKey(
{
name: "AES-GCM",
length: 128,
},
true, // extractable
["encrypt", "decrypt"],
);
// The iv is set to 0. We are never going to reuse the same key so we don't
// need to have an iv. (I hope that's correct...)
const iv = new Uint8Array(12);
// We use symmetric encryption. AES-GCM is the recommended algorithm and
// includes checks that the ciphertext has not been modified by an attacker.
const encrypted = await window.crypto.subtle.encrypt(
{
name: "AES-GCM",
iv,
},
key,
encoded,
);
// We use jwk encoding to be able to extract just the base64 encoded key.
// We will hardcode the rest of the attributes when importing back the key.
const exportedKey = await window.crypto.subtle.exportKey("jwk", key);
try {
const response = await fetch(BACKEND_V2_POST, {
method: "POST",
body: encrypted,
});
const json = await response.json();
if (json.id) {
const url = new URL(window.location.href);
// We need to store the key (and less importantly the id) as hash instead
// of queryParam in order to never send it to the server
url.hash = `json=${json.id},${exportedKey.k!}`;
const urlString = url.toString();
window.prompt(`🔒${t("alerts.uploadedSecurly")}`, urlString);
trackEvent(EVENT_IO, "export", "backend");
} else if (json.error_class === "RequestTooLargeError") {
window.alert(t("alerts.couldNotCreateShareableLinkTooBig"));
} else {
window.alert(t("alerts.couldNotCreateShareableLink"));
}
} catch (error) {
console.error(error);
window.alert(t("alerts.couldNotCreateShareableLink"));
}
};

66
src/excalidraw-app/index.tsx
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@ -13,16 +13,21 @@ import { ImportedDataState } from "../data/types";
import CollabWrapper, { CollabAPI } from "./collab/CollabWrapper";
import { TopErrorBoundary } from "../components/TopErrorBoundary";
import { t } from "../i18n";
import { loadScene } from "./data";
import { exportToBackend, loadScene } from "./data";
import { getCollaborationLinkData } from "./data";
import { EVENT } from "../constants";
import { loadFromFirebase } from "./data/firebase";
import { ExcalidrawImperativeAPI } from "../components/App";
import { debounce, ResolvablePromise, resolvablePromise } from "../utils";
import { AppState, ExcalidrawAPIRefValue } from "../types";
import { ExcalidrawElement } from "../element/types";
import {
ExcalidrawElement,
NonDeletedExcalidrawElement,
} from "../element/types";
import { SAVE_TO_LOCAL_STORAGE_TIMEOUT } from "./app_constants";
import { EVENT_LOAD, EVENT_SHARE, trackEvent } from "../analytics";
import { ErrorDialog } from "../components/ErrorDialog";
import { getDefaultAppState } from "../appState";
const excalidrawRef: React.MutableRefObject<
MarkRequired<ExcalidrawAPIRefValue, "ready" | "readyPromise">
@ -178,6 +183,7 @@ function ExcalidrawWrapper(props: { collab: CollabAPI }) {
width: window.innerWidth,
height: window.innerHeight,
});
const [errorMessage, setErrorMessage] = useState("");
useLayoutEffect(() => {
const onResize = () => {
@ -260,18 +266,52 @@ function ExcalidrawWrapper(props: { collab: CollabAPI }) {
}
};
const onExportToBackend = async (
exportedElements: readonly NonDeletedExcalidrawElement[],
appState: AppState,
canvas: HTMLCanvasElement | null,
) => {
if (exportedElements.length === 0) {
return window.alert(t("alerts.cannotExportEmptyCanvas"));
}
if (canvas) {
try {
await exportToBackend(exportedElements, {
...appState,
viewBackgroundColor: appState.exportBackground
? appState.viewBackgroundColor
: getDefaultAppState().viewBackgroundColor,
});
} catch (error) {
if (error.name !== "AbortError") {
const { width, height } = canvas;
console.error(error, { width, height });
setErrorMessage(error.message);
}
}
}
};
return (
<Excalidraw
ref={excalidrawRef}
onChange={onChange}
width={dimensions.width}
height={dimensions.height}
initialData={initialStatePromiseRef.current.promise}
user={{ name: collab.username }}
onCollabButtonClick={collab.onCollabButtonClick}
isCollaborating={collab.isCollaborating}
onPointerUpdate={collab.onPointerUpdate}
/>
<>
<Excalidraw
ref={excalidrawRef}
onChange={onChange}
width={dimensions.width}
height={dimensions.height}
initialData={initialStatePromiseRef.current.promise}
user={{ name: collab.username }}
onCollabButtonClick={collab.onCollabButtonClick}
isCollaborating={collab.isCollaborating}
onPointerUpdate={collab.onPointerUpdate}
onExportToBackend={onExportToBackend}
/>
{errorMessage && (
<ErrorDialog
message={errorMessage}
onClose={() => setErrorMessage("")}
/>
)}
</>
);
}

2
src/packages/excalidraw/CHANGELOG.MD → src/packages/excalidraw/CHANGELOG.md
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@ -16,6 +16,7 @@ Please add the latest change on the top under the correct section.
### Features
- Add support for `exportToBackend` prop to allow host apps to implement shareable links [#2612](https://github.com/excalidraw/excalidraw/pull/2612/files)
- Add zoom to selection [#2522](https://github.com/excalidraw/excalidraw/pull/2522)
- Insert Library items in the middle of the screen [#2527](https://github.com/excalidraw/excalidraw/pull/2527)
- Show shortcut context menu [#2501](https://github.com/excalidraw/excalidraw/pull/2501)
@ -25,6 +26,7 @@ Please add the latest change on the top under the correct section.
- Support CSV graphs and improve the look and feel [#2495](https://github.com/excalidraw/excalidraw/pull/2495)
### Fixes
- Consistent case for export locale strings [#2622](https://github.com/excalidraw/excalidraw/pull/2622)
- Remove unnecessary console.error as it was polluting Sentry [#2637](https://github.com/excalidraw/excalidraw/pull/2637)
- Fix scroll-to-center on init for non-zero canvas offsets [#2445](https://github.com/excalidraw/excalidraw/pull/2445)

13
src/packages/excalidraw/README.md
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@ -141,6 +141,7 @@ export default function App() {
| [`onCollabButtonClick`](#onCollabButtonClick) | Function | | Callback to be triggered when the collab button is clicked |
| [`isCollaborating`](#isCollaborating) | `boolean` | | This implies if the app is in collaboration mode |
| [`onPointerUpdate`](#onPointerUpdate) | Function | | Callback triggered when mouse pointer is updated. |
| [`onExportToBackend`](#onExportToBackend) | Function | | Callback triggered when link button is clicked on export dialog |
#### `width`
@ -260,3 +261,15 @@ This callback is triggered when mouse pointer is updated.
2.`button`: The position of the button. This will be one of `["down", "up"]`
3.`pointersMap`: [`pointers map`](https://github.com/excalidraw/excalidraw/blob/182a3e39e1362d73d2a565c870eb2fb72071fdcc/src/types.ts#L122) of the scene
#### `onExportToBackend`
This callback is triggered when the shareable-link button is clicked in the export dialog. The link button will only be shown if this callback is passed.
```js
(exportedElements, appState, canvas) => void
```
1. `exportedElements`: An array of [non deleted elements](https://github.com/excalidraw/excalidraw/blob/6e45cb95dbd7a8be1859c7055b06957298e3097c/src/element/types.ts#L76) which needs to be exported.
2. `appState`: [AppState](https://github.com/excalidraw/excalidraw/blob/4c90ea5667d29effe8ec4a115e49efc7c340cdb3/src/types.ts#L33) of the scene.
3. `canvas`: The `HTMLCanvasElement` of the scene.

2
src/packages/excalidraw/index.tsx
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@ -22,6 +22,7 @@ const Excalidraw = (props: ExcalidrawProps) => {
onCollabButtonClick,
isCollaborating,
onPointerUpdate,
onExportToBackend,
} = props;
useEffect(() => {
@ -57,6 +58,7 @@ const Excalidraw = (props: ExcalidrawProps) => {
onCollabButtonClick={onCollabButtonClick}
isCollaborating={isCollaborating}
onPointerUpdate={onPointerUpdate}
onExportToBackend={onExportToBackend}
/>
</IsMobileProvider>
</InitializeApp>

5
src/types.ts
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@ -166,6 +166,11 @@ export interface ExcalidrawProps {
button: "down" | "up";
pointersMap: Gesture["pointers"];
}) => void;
onExportToBackend?: (
exportedElements: readonly NonDeletedExcalidrawElement[],
appState: AppState,
canvas: HTMLCanvasElement | null,
) => void;
}
export type SceneData = {

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