feat: Remove support for V1 unencrypted backend (#4189)

.env

@@ -1,4 +1,3 @@
-REACT_APP_BACKEND_V1_GET_URL=https://json-dev.excalidraw.com/api/v1/
 REACT_APP_BACKEND_V2_GET_URL=https://json-dev.excalidraw.com/api/v2/
 REACT_APP_BACKEND_V2_POST_URL=https://json-dev.excalidraw.com/api/v2/post/
 

.env.production

@@ -1,4 +1,3 @@
-REACT_APP_BACKEND_V1_GET_URL=https://json.excalidraw.com/api/v1/
 REACT_APP_BACKEND_V2_GET_URL=https://json.excalidraw.com/api/v2/
 REACT_APP_BACKEND_V2_POST_URL=https://json.excalidraw.com/api/v2/post/
 

src/excalidraw-app/data/index.ts

@@ -22,7 +22,6 @@ import { saveFilesToFirebase } from "./firebase";
 
 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;
 
@@ -176,44 +175,36 @@ export const decryptImported = async (
 };
 
 const importFromBackend = async (
-  id: string | null,
-  privateKey?: string | null,
+  id: string,
+  privateKey: string,
 ): Promise<ImportedDataState> => {
   try {
-    const response = await fetch(
-      privateKey ? `${BACKEND_V2_GET}${id}` : `${BACKEND_GET}${id}.json`,
-    );
+    const response = await fetch(`${BACKEND_V2_GET}${id}`);
 
     if (!response.ok) {
       window.alert(t("alerts.importBackendFailed"));
       return {};
     }
-    let data: ImportedDataState;
-    if (privateKey) {
-      const buffer = await response.arrayBuffer();
+    const buffer = await response.arrayBuffer();
 
-      let decrypted: ArrayBuffer;
-      try {
-        // Buffer should contain both the IV (fixed length) and encrypted data
-        const iv = buffer.slice(0, IV_LENGTH_BYTES);
-        const encrypted = buffer.slice(IV_LENGTH_BYTES, buffer.byteLength);
-        decrypted = await decryptImported(iv, encrypted, privateKey);
-      } catch (error: any) {
-        // Fixed IV (old format, backward compatibility)
-        const fixedIv = new Uint8Array(IV_LENGTH_BYTES);
-        decrypted = await decryptImported(fixedIv, buffer, privateKey);
-      }
-
-      // We need to convert the decrypted array buffer to a string
-      const string = new window.TextDecoder("utf-8").decode(
-        new Uint8Array(decrypted),
-      );
-      data = JSON.parse(string);
-    } else {
-      // Legacy format
-      data = await response.json();
+    let decrypted: ArrayBuffer;
+    try {
+      // Buffer should contain both the IV (fixed length) and encrypted data
+      const iv = buffer.slice(0, IV_LENGTH_BYTES);
+      const encrypted = buffer.slice(IV_LENGTH_BYTES, buffer.byteLength);
+      decrypted = await decryptImported(iv, encrypted, privateKey);
+    } catch (error: any) {
+      // Fixed IV (old format, backward compatibility)
+      const fixedIv = new Uint8Array(IV_LENGTH_BYTES);
+      decrypted = await decryptImported(fixedIv, buffer, privateKey);
     }
 
+    // We need to convert the decrypted array buffer to a string
+    const string = new window.TextDecoder("utf-8").decode(
+      new Uint8Array(decrypted),
+    );
+    const data: ImportedDataState = JSON.parse(string);
+
     return {
       elements: data.elements || null,
       appState: data.appState || null,
@@ -234,7 +225,7 @@ export const loadScene = async (
   localDataState: ImportedDataState | undefined | null,
 ) => {
   let data;
-  if (id != null) {
+  if (id != null && privateKey != null) {
     // the private key is used to decrypt the content from the server, take
     // extra care not to leak it
     data = restore(

src/excalidraw-app/index.tsx

@@ -184,10 +184,7 @@ const initializeScene = async (opts: {
       // otherwise, prompt whether user wants to override current scene
       window.confirm(t("alerts.loadSceneOverridePrompt"))
     ) {
-      // Backwards compatibility with legacy url format
-      if (id) {
-        scene = await loadScene(id, null, localDataState);
-      } else if (jsonBackendMatch) {
+      if (jsonBackendMatch) {
         scene = await loadScene(
           jsonBackendMatch[1],
           jsonBackendMatch[2],

src/global.d.ts

@@ -19,7 +19,6 @@ interface Window {
 // https://github.com/facebook/create-react-app/blob/ddcb7d5/packages/react-scripts/lib/react-app.d.ts
 declare namespace NodeJS {
   interface ProcessEnv {
-    readonly REACT_APP_BACKEND_V1_GET_URL: string;
     readonly REACT_APP_BACKEND_V2_GET_URL: string;
     readonly REACT_APP_BACKEND_V2_POST_URL: string;
     readonly REACT_APP_SOCKET_SERVER_URL: string;