10 files changed, 1054 insertions, 0 deletions
diff --git a/excalidraw-app/components/AI.tsx b/excalidraw-app/components/AI.tsx
new file mode 100644
index 0000000..ba13849
--- /dev/null
+++ b/excalidraw-app/components/AI.tsx
@@ -0,0 +1,159 @@
+import type { ExcalidrawImperativeAPI } from "@excalidraw/excalidraw/types";
+import {
+  DiagramToCodePlugin,
+  exportToBlob,
+  getTextFromElements,
+  MIME_TYPES,
+  TTDDialog,
+} from "@excalidraw/excalidraw";
+import { getDataURL } from "@excalidraw/excalidraw/data/blob";
+import { safelyParseJSON } from "@excalidraw/excalidraw/utils";
+
+export const AIComponents = ({
+  excalidrawAPI,
+}: {
+  excalidrawAPI: ExcalidrawImperativeAPI;
+}) => {
+  return (
+    <>
+      <DiagramToCodePlugin
+        generate={async ({ frame, children }) => {
+          const appState = excalidrawAPI.getAppState();
+
+          const blob = await exportToBlob({
+            elements: children,
+            appState: {
+              ...appState,
+              exportBackground: true,
+              viewBackgroundColor: appState.viewBackgroundColor,
+            },
+            exportingFrame: frame,
+            files: excalidrawAPI.getFiles(),
+            mimeType: MIME_TYPES.jpg,
+          });
+
+          const dataURL = await getDataURL(blob);
+
+          const textFromFrameChildren = getTextFromElements(children);
+
+          const response = await fetch(
+            `${
+              import.meta.env.VITE_APP_AI_BACKEND
+            }/v1/ai/diagram-to-code/generate`,
+            {
+              method: "POST",
+              headers: {
+                Accept: "application/json",
+                "Content-Type": "application/json",
+              },
+              body: JSON.stringify({
+                texts: textFromFrameChildren,
+                image: dataURL,
+                theme: appState.theme,
+              }),
+            },
+          );
+
+          if (!response.ok) {
+            const text = await response.text();
+            const errorJSON = safelyParseJSON(text);
+
+            if (!errorJSON) {
+              throw new Error(text);
+            }
+
+            if (errorJSON.statusCode === 429) {
+              return {
+                html: `<html>
+                <body style="margin: 0; text-align: center">
+                <div style="display: flex; align-items: center; justify-content: center; flex-direction: column; height: 100vh; padding: 0 60px">
+                  <div style="color:red">Too many requests today,</br>please try again tomorrow!</div>
+                  </br>
+                  </br>
+                  <div>You can also try <a href="${
+                    import.meta.env.VITE_APP_PLUS_LP
+                  }/plus?utm_source=excalidraw&utm_medium=app&utm_content=d2c" target="_blank" rel="noreferrer noopener">kj-diagramming cloud</a> to get more requests.</div>
+                </div>
+                </body>
+                </html>`,
+              };
+            }
+
+            throw new Error(errorJSON.message || text);
+          }
+
+          try {
+            const { html } = await response.json();
+
+            if (!html) {
+              throw new Error("Generation failed (invalid response)");
+            }
+            return {
+              html,
+            };
+          } catch (error: any) {
+            throw new Error("Generation failed (invalid response)");
+          }
+        }}
+      />
+
+      <TTDDialog
+        onTextSubmit={async (input) => {
+          try {
+            const response = await fetch(
+              `${
+                import.meta.env.VITE_APP_AI_BACKEND
+              }/v1/ai/text-to-diagram/generate`,
+              {
+                method: "POST",
+                headers: {
+                  Accept: "application/json",
+                  "Content-Type": "application/json",
+                },
+                body: JSON.stringify({ prompt: input }),
+              },
+            );
+
+            const rateLimit = response.headers.has("X-Ratelimit-Limit")
+              ? parseInt(response.headers.get("X-Ratelimit-Limit") || "0", 10)
+              : undefined;
+
+            const rateLimitRemaining = response.headers.has(
+              "X-Ratelimit-Remaining",
+            )
+              ? parseInt(
+                  response.headers.get("X-Ratelimit-Remaining") || "0",
+                  10,
+                )
+              : undefined;
+
+            const json = await response.json();
+
+            if (!response.ok) {
+              if (response.status === 429) {
+                return {
+                  rateLimit,
+                  rateLimitRemaining,
+                  error: new Error(
+                    "Too many requests today, please try again tomorrow!",
+                  ),
+                };
+              }
+
+              throw new Error(json.message || "Generation failed...");
+            }
+
+            const generatedResponse = json.generatedResponse;
+            if (!generatedResponse) {
+              throw new Error("Generation failed...");
+            }
+
+            return { generatedResponse, rateLimit, rateLimitRemaining };
+          } catch (err: any) {
+            throw new Error("Request failed");
+          }
+        }}
+      />
+    </>
+  );
+};
diff --git a/excalidraw-app/components/AppFooter.tsx b/excalidraw-app/components/AppFooter.tsx
new file mode 100644
index 0000000..e81df7c
--- /dev/null
+++ b/excalidraw-app/components/AppFooter.tsx
@@ -0,0 +1,29 @@
+import React from "react";
+import { Footer } from "@excalidraw/excalidraw/index";
+import { EncryptedIcon } from "./EncryptedIcon";
+import { ExcalidrawPlusAppLink } from "./ExcalidrawPlusAppLink";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+import { DebugFooter, isVisualDebuggerEnabled } from "./DebugCanvas";
+
+export const AppFooter = React.memo(
+  ({ onChange }: { onChange: () => void }) => {
+    return (
+      <Footer>
+        <div
+          style={{
+            display: "flex",
+            gap: ".5rem",
+            alignItems: "center",
+          }}
+        >
+          {isVisualDebuggerEnabled() && <DebugFooter onChange={onChange} />}
+          {isExcalidrawPlusSignedUser ? (
+            <ExcalidrawPlusAppLink />
+          ) : (
+            <EncryptedIcon />
+          )}
+        </div>
+      </Footer>
+    );
+  },
+);
diff --git a/excalidraw-app/components/AppMainMenu.tsx b/excalidraw-app/components/AppMainMenu.tsx
new file mode 100644
index 0000000..426ec69
--- /dev/null
+++ b/excalidraw-app/components/AppMainMenu.tsx
@@ -0,0 +1,86 @@
+import React from "react";
+import {
+  loginIcon,
+  ExcalLogo,
+  eyeIcon,
+} from "@excalidraw/excalidraw/components/icons";
+import type { Theme } from "@excalidraw/excalidraw/element/types";
+import { MainMenu } from "@excalidraw/excalidraw/index";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+import { LanguageList } from "../app-language/LanguageList";
+import { saveDebugState } from "./DebugCanvas";
+
+export const AppMainMenu: React.FC<{
+  onCollabDialogOpen: () => any;
+  isCollaborating: boolean;
+  isCollabEnabled: boolean;
+  theme: Theme | "system";
+  setTheme: (theme: Theme | "system") => void;
+  refresh: () => void;
+}> = React.memo((props) => {
+  return (
+    <MainMenu>
+      <MainMenu.DefaultItems.LoadScene />
+      <MainMenu.DefaultItems.SaveToActiveFile />
+      <MainMenu.DefaultItems.Export />
+      <MainMenu.DefaultItems.SaveAsImage />
+      {props.isCollabEnabled && (
+        <MainMenu.DefaultItems.LiveCollaborationTrigger
+          isCollaborating={props.isCollaborating}
+          onSelect={() => props.onCollabDialogOpen()}
+        />
+      )}
+      <MainMenu.DefaultItems.CommandPalette className="highlighted" />
+      <MainMenu.DefaultItems.SearchMenu />
+      <MainMenu.DefaultItems.Help />
+      <MainMenu.DefaultItems.ClearCanvas />
+      <MainMenu.Separator />
+      <MainMenu.ItemLink
+        icon={ExcalLogo}
+        href={`${
+          import.meta.env.VITE_APP_PLUS_LP
+        }/plus?utm_source=excalidraw&utm_medium=app&utm_content=hamburger`}
+        className=""
+      >
+        kj-diagramming cloud
+      </MainMenu.ItemLink>
+      <MainMenu.DefaultItems.Socials />
+      <MainMenu.ItemLink
+        icon={loginIcon}
+        href={`${import.meta.env.VITE_APP_PLUS_APP}${
+          isExcalidrawPlusSignedUser ? "" : "/sign-up"
+        }?utm_source=signin&utm_medium=app&utm_content=hamburger`}
+        className="highlighted"
+      >
+        {isExcalidrawPlusSignedUser ? "Sign in" : "Sign up"}
+      </MainMenu.ItemLink>
+      {import.meta.env.DEV && (
+        <MainMenu.Item
+          icon={eyeIcon}
+          onClick={() => {
+            if (window.visualDebug) {
+              delete window.visualDebug;
+              saveDebugState({ enabled: false });
+            } else {
+              window.visualDebug = { data: [] };
+              saveDebugState({ enabled: true });
+            }
+            props?.refresh();
+          }}
+        >
+          Visual Debug
+        </MainMenu.Item>
+      )}
+      <MainMenu.Separator />
+      <MainMenu.DefaultItems.ToggleTheme
+        allowSystemTheme
+        theme={props.theme}
+        onSelect={props.setTheme}
+      />
+      <MainMenu.ItemCustom>
+        <LanguageList style={{ width: "100%" }} />
+      </MainMenu.ItemCustom>
+      <MainMenu.DefaultItems.ChangeCanvasBackground />
+    </MainMenu>
+  );
+});
diff --git a/excalidraw-app/components/AppWelcomeScreen.tsx b/excalidraw-app/components/AppWelcomeScreen.tsx
new file mode 100644
index 0000000..139a951
--- /dev/null
+++ b/excalidraw-app/components/AppWelcomeScreen.tsx
@@ -0,0 +1,72 @@
+import React from "react";
+import { loginIcon } from "@excalidraw/excalidraw/components/icons";
+import { useI18n } from "@excalidraw/excalidraw/i18n";
+import { WelcomeScreen } from "@excalidraw/excalidraw/index";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+import { POINTER_EVENTS } from "@excalidraw/excalidraw/constants";
+
+export const AppWelcomeScreen: React.FC<{
+  onCollabDialogOpen: () => any;
+  isCollabEnabled: boolean;
+}> = React.memo((props) => {
+  const { t } = useI18n();
+  let headingContent;
+
+  if (isExcalidrawPlusSignedUser) {
+    headingContent = t("welcomeScreen.app.center_heading_plus")
+      .split(/(kj-diagramming)/)
+      .map((bit, idx) => {
+        if (bit === "kj-diagramming") {
+          return (
+            <a
+              style={{ pointerEvents: POINTER_EVENTS.inheritFromUI }}
+              href={`${
+                import.meta.env.VITE_APP_PLUS_APP
+              }?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenSignedInUser`}
+              key={idx}
+            >
+              kj-diagramming
+            </a>
+          );
+        }
+        return bit;
+      });
+  } else {
+    headingContent = t("welcomeScreen.app.center_heading");
+  }
+
+  return (
+    <WelcomeScreen>
+      <WelcomeScreen.Hints.MenuHint>
+        {t("welcomeScreen.app.menuHint")}
+      </WelcomeScreen.Hints.MenuHint>
+      <WelcomeScreen.Hints.ToolbarHint />
+      <WelcomeScreen.Hints.HelpHint />
+      <WelcomeScreen.Center>
+        <WelcomeScreen.Center.Heading>
+          {headingContent}
+        </WelcomeScreen.Center.Heading>
+        <WelcomeScreen.Center.Menu>
+          <WelcomeScreen.Center.MenuItemLoadScene />
+          <WelcomeScreen.Center.MenuItemHelp />
+          {props.isCollabEnabled && (
+            <WelcomeScreen.Center.MenuItemLiveCollaborationTrigger
+              onSelect={() => props.onCollabDialogOpen()}
+            />
+          )}
+          {!isExcalidrawPlusSignedUser && (
+            <WelcomeScreen.Center.MenuItemLink
+              href={`${
+                import.meta.env.VITE_APP_PLUS_LP
+              }/plus?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenGuest`}
+              shortcut={null}
+              icon={loginIcon}
+            >
+              Sign up
+            </WelcomeScreen.Center.MenuItemLink>
+          )}
+        </WelcomeScreen.Center.Menu>
+      </WelcomeScreen.Center>
+    </WelcomeScreen>
+  );
+});
diff --git a/excalidraw-app/components/DebugCanvas.tsx b/excalidraw-app/components/DebugCanvas.tsx
new file mode 100644
index 0000000..31898ba
--- /dev/null
+++ b/excalidraw-app/components/DebugCanvas.tsx
@@ -0,0 +1,344 @@
+import { useCallback, useImperativeHandle, useRef } from "react";
+import { type AppState } from "@excalidraw/excalidraw/types";
+import { throttleRAF } from "@excalidraw/excalidraw/utils";
+import {
+  bootstrapCanvas,
+  getNormalizedCanvasDimensions,
+} from "@excalidraw/excalidraw/renderer/helpers";
+import type { DebugElement } from "@excalidraw/excalidraw/visualdebug";
+import {
+  ArrowheadArrowIcon,
+  CloseIcon,
+  TrashIcon,
+} from "@excalidraw/excalidraw/components/icons";
+import { STORAGE_KEYS } from "../app_constants";
+import type { Curve } from "../../packages/math";
+import {
+  isLineSegment,
+  type GlobalPoint,
+  type LineSegment,
+} from "../../packages/math";
+import { isCurve } from "../../packages/math/curve";
+
+const renderLine = (
+  context: CanvasRenderingContext2D,
+  zoom: number,
+  segment: LineSegment<GlobalPoint>,
+  color: string,
+) => {
+  context.save();
+  context.strokeStyle = color;
+  context.beginPath();
+  context.moveTo(segment[0][0] * zoom, segment[0][1] * zoom);
+  context.lineTo(segment[1][0] * zoom, segment[1][1] * zoom);
+  context.stroke();
+  context.restore();
+};
+
+const renderCubicBezier = (
+  context: CanvasRenderingContext2D,
+  zoom: number,
+  [start, control1, control2, end]: Curve<GlobalPoint>,
+  color: string,
+) => {
+  context.save();
+  context.strokeStyle = color;
+  context.beginPath();
+  context.moveTo(start[0] * zoom, start[1] * zoom);
+  context.bezierCurveTo(
+    control1[0] * zoom,
+    control1[1] * zoom,
+    control2[0] * zoom,
+    control2[1] * zoom,
+    end[0] * zoom,
+    end[1] * zoom,
+  );
+  context.stroke();
+  context.restore();
+};
+
+const renderOrigin = (context: CanvasRenderingContext2D, zoom: number) => {
+  context.strokeStyle = "#888";
+  context.save();
+  context.beginPath();
+  context.moveTo(-10 * zoom, -10 * zoom);
+  context.lineTo(10 * zoom, 10 * zoom);
+  context.moveTo(10 * zoom, -10 * zoom);
+  context.lineTo(-10 * zoom, 10 * zoom);
+  context.stroke();
+  context.save();
+};
+
+const render = (
+  frame: DebugElement[],
+  context: CanvasRenderingContext2D,
+  appState: AppState,
+) => {
+  frame.forEach((el: DebugElement) => {
+    switch (true) {
+      case isLineSegment(el.data):
+        renderLine(
+          context,
+          appState.zoom.value,
+          el.data as LineSegment<GlobalPoint>,
+          el.color,
+        );
+        break;
+      case isCurve(el.data):
+        renderCubicBezier(
+          context,
+          appState.zoom.value,
+          el.data as Curve<GlobalPoint>,
+          el.color,
+        );
+        break;
+      default:
+        throw new Error(`Unknown element type ${JSON.stringify(el)}`);
+    }
+  });
+};
+
+const _debugRenderer = (
+  canvas: HTMLCanvasElement,
+  appState: AppState,
+  scale: number,
+  refresh: () => void,
+) => {
+  const [normalizedWidth, normalizedHeight] = getNormalizedCanvasDimensions(
+    canvas,
+    scale,
+  );
+
+  if (appState.height !== canvas.height || appState.width !== canvas.width) {
+    refresh();
+  }
+
+  const context = bootstrapCanvas({
+    canvas,
+    scale,
+    normalizedWidth,
+    normalizedHeight,
+    viewBackgroundColor: "transparent",
+  });
+
+  // Apply zoom
+  context.save();
+  context.translate(
+    appState.scrollX * appState.zoom.value,
+    appState.scrollY * appState.zoom.value,
+  );
+
+  renderOrigin(context, appState.zoom.value);
+
+  if (
+    window.visualDebug?.currentFrame &&
+    window.visualDebug?.data &&
+    window.visualDebug.data.length > 0
+  ) {
+    // Render only one frame
+    const [idx] = debugFrameData();
+
+    render(window.visualDebug.data[idx], context, appState);
+  } else {
+    // Render all debug frames
+    window.visualDebug?.data.forEach((frame) => {
+      render(frame, context, appState);
+    });
+  }
+
+  if (window.visualDebug) {
+    window.visualDebug!.data =
+      window.visualDebug?.data.map((frame) =>
+        frame.filter((el) => el.permanent),
+      ) ?? [];
+  }
+};
+
+const debugFrameData = (): [number, number] => {
+  const currentFrame = window.visualDebug?.currentFrame ?? 0;
+  const frameCount = window.visualDebug?.data.length ?? 0;
+
+  if (frameCount > 0) {
+    return [currentFrame % frameCount, window.visualDebug?.currentFrame ?? 0];
+  }
+
+  return [0, 0];
+};
+
+export const saveDebugState = (debug: { enabled: boolean }) => {
+  try {
+    localStorage.setItem(
+      STORAGE_KEYS.LOCAL_STORAGE_DEBUG,
+      JSON.stringify(debug),
+    );
+  } catch (error: any) {
+    console.error(error);
+  }
+};
+
+export const debugRenderer = throttleRAF(
+  (
+    canvas: HTMLCanvasElement,
+    appState: AppState,
+    scale: number,
+    refresh: () => void,
+  ) => {
+    _debugRenderer(canvas, appState, scale, refresh);
+  },
+  { trailing: true },
+);
+
+export const loadSavedDebugState = () => {
+  let debug;
+  try {
+    const savedDebugState = localStorage.getItem(
+      STORAGE_KEYS.LOCAL_STORAGE_DEBUG,
+    );
+    if (savedDebugState) {
+      debug = JSON.parse(savedDebugState) as { enabled: boolean };
+    }
+  } catch (error: any) {
+    console.error(error);
+  }
+
+  return debug ?? { enabled: false };
+};
+
+export const isVisualDebuggerEnabled = () =>
+  Array.isArray(window.visualDebug?.data);
+
+export const DebugFooter = ({ onChange }: { onChange: () => void }) => {
+  const moveForward = useCallback(() => {
+    if (
+      !window.visualDebug?.currentFrame ||
+      isNaN(window.visualDebug?.currentFrame ?? -1)
+    ) {
+      window.visualDebug!.currentFrame = 0;
+    }
+    window.visualDebug!.currentFrame += 1;
+    onChange();
+  }, [onChange]);
+  const moveBackward = useCallback(() => {
+    if (
+      !window.visualDebug?.currentFrame ||
+      isNaN(window.visualDebug?.currentFrame ?? -1) ||
+      window.visualDebug?.currentFrame < 1
+    ) {
+      window.visualDebug!.currentFrame = 1;
+    }
+    window.visualDebug!.currentFrame -= 1;
+    onChange();
+  }, [onChange]);
+  const reset = useCallback(() => {
+    window.visualDebug!.currentFrame = undefined;
+    onChange();
+  }, [onChange]);
+  const trashFrames = useCallback(() => {
+    if (window.visualDebug) {
+      window.visualDebug.currentFrame = undefined;
+      window.visualDebug.data = [];
+    }
+    onChange();
+  }, [onChange]);
+
+  return (
+    <>
+      <button
+        className="ToolIcon_type_button"
+        data-testid="debug-forward"
+        aria-label="Move forward"
+        type="button"
+        onClick={trashFrames}
+      >
+        <div
+          className="ToolIcon__icon"
+          aria-hidden="true"
+          aria-disabled="false"
+        >
+          {TrashIcon}
+        </div>
+      </button>
+      <button
+        className="ToolIcon_type_button"
+        data-testid="debug-forward"
+        aria-label="Move forward"
+        type="button"
+        onClick={moveBackward}
+      >
+        <div
+          className="ToolIcon__icon"
+          aria-hidden="true"
+          aria-disabled="false"
+        >
+          <ArrowheadArrowIcon flip />
+        </div>
+      </button>
+      <button
+        className="ToolIcon_type_button"
+        data-testid="debug-forward"
+        aria-label="Move forward"
+        type="button"
+        onClick={reset}
+      >
+        <div
+          className="ToolIcon__icon"
+          aria-hidden="true"
+          aria-disabled="false"
+        >
+          {CloseIcon}
+        </div>
+      </button>
+      <button
+        className="ToolIcon_type_button"
+        data-testid="debug-backward"
+        aria-label="Move backward"
+        type="button"
+        onClick={moveForward}
+      >
+        <div
+          className="ToolIcon__icon"
+          aria-hidden="true"
+          aria-disabled="false"
+        >
+          <ArrowheadArrowIcon />
+        </div>
+      </button>
+    </>
+  );
+};
+
+interface DebugCanvasProps {
+  appState: AppState;
+  scale: number;
+  ref?: React.Ref<HTMLCanvasElement>;
+}
+
+const DebugCanvas = ({ appState, scale, ref }: DebugCanvasProps) => {
+  const { width, height } = appState;
+
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  useImperativeHandle<HTMLCanvasElement | null, HTMLCanvasElement | null>(
+    ref,
+    () => canvasRef.current,
+    [canvasRef],
+  );
+
+  return (
+    <canvas
+      style={{
+        width,
+        height,
+        position: "absolute",
+        zIndex: 2,
+        pointerEvents: "none",
+      }}
+      width={width * scale}
+      height={height * scale}
+      ref={canvasRef}
+    >
+      Debug Canvas
+    </canvas>
+  );
+};
+
+export default DebugCanvas;
diff --git a/excalidraw-app/components/EncryptedIcon.tsx b/excalidraw-app/components/EncryptedIcon.tsx
new file mode 100644
index 0000000..a3a8417
--- /dev/null
+++ b/excalidraw-app/components/EncryptedIcon.tsx
@@ -0,0 +1,21 @@
+import { shield } from "@excalidraw/excalidraw/components/icons";
+import { Tooltip } from "@excalidraw/excalidraw/components/Tooltip";
+import { useI18n } from "@excalidraw/excalidraw/i18n";
+
+export const EncryptedIcon = () => {
+  const { t } = useI18n();
+
+  return (
+    <a
+      className="encrypted-icon tooltip"
+      href="https://plus.excalidraw.com/blog/end-to-end-encryption"
+      target="_blank"
+      rel="noopener noreferrer"
+      aria-label={t("encrypted.link")}
+    >
+      <Tooltip label={t("encrypted.tooltip")} long={true}>
+        {shield}
+      </Tooltip>
+    </a>
+  );
+};
diff --git a/excalidraw-app/components/ExcalidrawPlusAppLink.tsx b/excalidraw-app/components/ExcalidrawPlusAppLink.tsx
new file mode 100644
index 0000000..88cc0fc
--- /dev/null
+++ b/excalidraw-app/components/ExcalidrawPlusAppLink.tsx
@@ -0,0 +1,19 @@
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+
+export const ExcalidrawPlusAppLink = () => {
+  if (!isExcalidrawPlusSignedUser) {
+    return null;
+  }
+  return (
+    <a
+      href={`${
+        import.meta.env.VITE_APP_PLUS_APP
+      }?utm_source=excalidraw&utm_medium=app&utm_content=signedInUserRedirectButton#excalidraw-redirect`}
+      target="_blank"
+      rel="noreferrer"
+      className="plus-button"
+    >
+      Go to kj-diagramming cloud
+    </a>
+  );
+};
diff --git a/excalidraw-app/components/ExportToExcalidrawPlus.tsx b/excalidraw-app/components/ExportToExcalidrawPlus.tsx
new file mode 100644
index 0000000..782ecd9
--- /dev/null
+++ b/excalidraw-app/components/ExportToExcalidrawPlus.tsx
@@ -0,0 +1,133 @@
+import React from "react";
+import { Card } from "@excalidraw/excalidraw/components/Card";
+import { ToolButton } from "@excalidraw/excalidraw/components/ToolButton";
+import { serializeAsJSON } from "@excalidraw/excalidraw/data/json";
+import { loadFirebaseStorage, saveFilesToFirebase } from "../data/firebase";
+import type {
+  FileId,
+  NonDeletedExcalidrawElement,
+} from "@excalidraw/excalidraw/element/types";
+import type {
+  AppState,
+  BinaryFileData,
+  BinaryFiles,
+} from "@excalidraw/excalidraw/types";
+import { nanoid } from "nanoid";
+import { useI18n } from "@excalidraw/excalidraw/i18n";
+import {
+  encryptData,
+  generateEncryptionKey,
+} from "@excalidraw/excalidraw/data/encryption";
+import { isInitializedImageElement } from "@excalidraw/excalidraw/element/typeChecks";
+import { FILE_UPLOAD_MAX_BYTES } from "../app_constants";
+import { encodeFilesForUpload } from "../data/FileManager";
+import { uploadBytes, ref } from "firebase/storage";
+import { MIME_TYPES } from "@excalidraw/excalidraw/constants";
+import { trackEvent } from "@excalidraw/excalidraw/analytics";
+import { getFrame } from "@excalidraw/excalidraw/utils";
+import { ExcalidrawLogo } from "@excalidraw/excalidraw/components/ExcalidrawLogo";
+
+export const exportToExcalidrawPlus = async (
+  elements: readonly NonDeletedExcalidrawElement[],
+  appState: Partial<AppState>,
+  files: BinaryFiles,
+  name: string,
+) => {
+  const storage = await loadFirebaseStorage();
+
+  const id = `${nanoid(12)}`;
+
+  const encryptionKey = (await generateEncryptionKey())!;
+  const encryptedData = await encryptData(
+    encryptionKey,
+    serializeAsJSON(elements, appState, files, "database"),
+  );
+
+  const blob = new Blob(
+    [encryptedData.iv, new Uint8Array(encryptedData.encryptedBuffer)],
+    {
+      type: MIME_TYPES.binary,
+    },
+  );
+
+  const storageRef = ref(storage, `/migrations/scenes/${id}`);
+  await uploadBytes(storageRef, blob, {
+    customMetadata: {
+      data: JSON.stringify({ version: 2, name }),
+      created: Date.now().toString(),
+    },
+  });
+
+  const filesMap = new Map<FileId, BinaryFileData>();
+  for (const element of elements) {
+    if (isInitializedImageElement(element) && files[element.fileId]) {
+      filesMap.set(element.fileId, files[element.fileId]);
+    }
+  }
+
+  if (filesMap.size) {
+    const filesToUpload = await encodeFilesForUpload({
+      files: filesMap,
+      encryptionKey,
+      maxBytes: FILE_UPLOAD_MAX_BYTES,
+    });
+
+    await saveFilesToFirebase({
+      prefix: `/migrations/files/scenes/${id}`,
+      files: filesToUpload,
+    });
+  }
+
+  window.open(
+    `${
+      import.meta.env.VITE_APP_PLUS_APP
+    }/import?excalidraw=${id},${encryptionKey}`,
+  );
+};
+
+export const ExportToExcalidrawPlus: React.FC<{
+  elements: readonly NonDeletedExcalidrawElement[];
+  appState: Partial<AppState>;
+  files: BinaryFiles;
+  name: string;
+  onError: (error: Error) => void;
+  onSuccess: () => void;
+}> = ({ elements, appState, files, name, onError, onSuccess }) => {
+  const { t } = useI18n();
+  return (
+    <Card color="primary">
+      <div className="Card-icon">
+        <ExcalidrawLogo
+          style={{
+            [`--color-logo-icon` as any]: "#fff",
+            width: "2.8rem",
+            height: "2.8rem",
+          }}
+        />
+      </div>
+      <h2>Excalidraw+</h2>
+      <div className="Card-details">
+        {t("exportDialog.excalidrawplus_description")}
+      </div>
+      <ToolButton
+        className="Card-button"
+        type="button"
+        title={t("exportDialog.excalidrawplus_button")}
+        aria-label={t("exportDialog.excalidrawplus_button")}
+        showAriaLabel={true}
+        onClick={async () => {
+          try {
+            trackEvent("export", "eplus", `ui (${getFrame()})`);
+            await exportToExcalidrawPlus(elements, appState, files, name);
+            onSuccess();
+          } catch (error: any) {
+            console.error(error);
+            if (error.name !== "AbortError") {
+              onError(new Error(t("exportDialog.excalidrawplus_exportError")));
+            }
+          }
+        }}
+      />
+    </Card>
+  );
+};
diff --git a/excalidraw-app/components/GitHubCorner.tsx b/excalidraw-app/components/GitHubCorner.tsx
new file mode 100644
index 0000000..4d74242
--- /dev/null
+++ b/excalidraw-app/components/GitHubCorner.tsx
@@ -0,0 +1,45 @@
+import oc from "open-color";
+import React from "react";
+import { THEME } from "@excalidraw/excalidraw/constants";
+import type { Theme } from "@excalidraw/excalidraw/element/types";
+
+// https://github.com/tholman/github-corners
+export const GitHubCorner = React.memo(
+  ({ theme, dir }: { theme: Theme; dir: string }) => (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="40"
+      height="40"
+      viewBox="0 0 250 250"
+      className="rtl-mirror"
+      style={{
+        marginTop: "calc(var(--space-factor) * -1)",
+        [dir === "rtl" ? "marginLeft" : "marginRight"]:
+          "calc(var(--space-factor) * -1)",
+      }}
+    >
+      <a
+        href="https://github.com/excalidraw/excalidraw"
+        target="_blank"
+        rel="noopener noreferrer"
+        aria-label="GitHub repository"
+      >
+        <path
+          d="M0 0l115 115h15l12 27 108 108V0z"
+          fill={theme === THEME.LIGHT ? oc.gray[6] : oc.gray[7]}
+        />
+        <path
+          className="octo-arm"
+          d="M128 109c-15-9-9-19-9-19 3-7 2-11 2-11-1-7 3-2 3-2 4 5 2 11 2 11-3 10 5 15 9 16"
+          style={{ transformOrigin: "130px 106px" }}
+          fill={theme === THEME.LIGHT ? oc.white : "var(--default-bg-color)"}
+        />
+        <path
+          className="octo-body"
+          d="M115 115s4 2 5 0l14-14c3-2 6-3 8-3-8-11-15-24 2-41 5-5 10-7 16-7 1-2 3-7 12-11 0 0 5 3 7 16 4 2 8 5 12 9s7 8 9 12c14 3 17 7 17 7-4 8-9 11-11 11 0 6-2 11-7 16-16 16-30 10-41 2 0 3-1 7-5 11l-12 11c-1 1 1 5 1 5z"
+          fill={theme === THEME.LIGHT ? oc.white : "var(--default-bg-color)"}
+        />
+      </a>
+    </svg>
+  ),
+);
diff --git a/excalidraw-app/components/TopErrorBoundary.tsx b/excalidraw-app/components/TopErrorBoundary.tsx
new file mode 100644
index 0000000..e7e00be
--- /dev/null
+++ b/excalidraw-app/components/TopErrorBoundary.tsx
@@ -0,0 +1,146 @@
+import React from "react";
+import * as Sentry from "@sentry/browser";
+import { t } from "@excalidraw/excalidraw/i18n";
+import Trans from "@excalidraw/excalidraw/components/Trans";
+
+interface TopErrorBoundaryState {
+  hasError: boolean;
+  sentryEventId: string;
+  localStorage: string;
+}
+
+export class TopErrorBoundary extends React.Component<
+  any,
+  TopErrorBoundaryState
+> {
+  state: TopErrorBoundaryState = {
+    hasError: false,
+    sentryEventId: "",
+    localStorage: "",
+  };
+
+  render() {
+    return this.state.hasError ? this.errorSplash() : this.props.children;
+  }
+
+  componentDidCatch(error: Error, errorInfo: any) {
+    const _localStorage: any = {};
+    for (const [key, value] of Object.entries({ ...localStorage })) {
+      try {
+        _localStorage[key] = JSON.parse(value);
+      } catch (error: any) {
+        _localStorage[key] = value;
+      }
+    }
+
+    Sentry.withScope((scope) => {
+      scope.setExtras(errorInfo);
+      const eventId = Sentry.captureException(error);
+
+      this.setState((state) => ({
+        hasError: true,
+        sentryEventId: eventId,
+        localStorage: JSON.stringify(_localStorage),
+      }));
+    });
+  }
+
+  private selectTextArea(event: React.MouseEvent<HTMLTextAreaElement>) {
+    if (event.target !== document.activeElement) {
+      event.preventDefault();
+      (event.target as HTMLTextAreaElement).select();
+    }
+  }
+
+  private async createGithubIssue() {
+    let body = "";
+    try {
+      const templateStrFn = (
+        await import(
+          /* webpackChunkName: "bug-issue-template" */ "../bug-issue-template"
+        )
+      ).default;
+      body = encodeURIComponent(templateStrFn(this.state.sentryEventId));
+    } catch (error: any) {
+      console.error(error);
+    }
+
+    window.open(
+      `https://github.com/excalidraw/excalidraw/issues/new?body=${body}`,
+      "_blank",
+      "noopener noreferrer",
+    );
+  }
+
+  private errorSplash() {
+    return (
+      <div className="ErrorSplash excalidraw">
+        <div className="ErrorSplash-messageContainer">
+          <div className="ErrorSplash-paragraph bigger align-center">
+            <Trans
+              i18nKey="errorSplash.headingMain"
+              button={(el) => (
+                <button onClick={() => window.location.reload()}>{el}</button>
+              )}
+            />
+          </div>
+          <div className="ErrorSplash-paragraph align-center">
+            <Trans
+              i18nKey="errorSplash.clearCanvasMessage"
+              button={(el) => (
+                <button
+                  onClick={() => {
+                    try {
+                      localStorage.clear();
+                      window.location.reload();
+                    } catch (error: any) {
+                      console.error(error);
+                    }
+                  }}
+                >
+                  {el}
+                </button>
+              )}
+            />
+            <br />
+            <div className="smaller">
+              <span role="img" aria-label="warning">
+                ⚠️
+              </span>
+              {t("errorSplash.clearCanvasCaveat")}
+              <span role="img" aria-hidden="true">
+                ⚠️
+              </span>
+            </div>
+          </div>
+          <div>
+            <div className="ErrorSplash-paragraph">
+              {t("errorSplash.trackedToSentry", {
+                eventId: this.state.sentryEventId,
+              })}
+            </div>
+            <div className="ErrorSplash-paragraph">
+              <Trans
+                i18nKey="errorSplash.openIssueMessage"
+                button={(el) => (
+                  <button onClick={() => this.createGithubIssue()}>{el}</button>
+                )}
+              />
+            </div>
+            <div className="ErrorSplash-paragraph">
+              <div className="ErrorSplash-details">
+                <label>{t("errorSplash.sceneContent")}</label>
+                <textarea
+                  rows={5}
+                  onPointerDown={this.selectTextArea}
+                  readOnly={true}
+                  value={this.state.localStorage}
+                />
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    );
+  }
+}