Replace MatrixClient.isValidRecoveryKey by local check with `decode…

…RecoveryKey`

src/components/views/dialogs/security/RestoreKeyBackupDialog.tsx

@@ -118,10 +118,24 @@ export default class RestoreKeyBackupDialog extends React.PureComponent<IProps,
         accessSecretStorage(async (): Promise<void> => {}, /* forceReset = */ true);
     };
 
+    /**
+     * Check if the recovery key is valid
+     * @param recoveryKey
+     * @private
+     */
+    private isValidRecoveryKey(recoveryKey: string): boolean {
+        try {
+            decodeRecoveryKey(recoveryKey);
+            return true;
+        } catch (e) {
+            return false;
+        }
+    }
+
     private onRecoveryKeyChange = (e: ChangeEvent<HTMLInputElement>): void => {
         this.setState({
             recoveryKey: e.target.value,
-            recoveryKeyValid: MatrixClientPeg.safeGet().isValidRecoveryKey(e.target.value),
+            recoveryKeyValid: this.isValidRecoveryKey(e.target.value),
         });
     };
 

test/components/views/dialogs/AccessSecretStorageDialog-test.tsx

@@ -59,13 +59,11 @@ describe("AccessSecretStorageDialog", () => {
     beforeEach(() => {
         mockClient = getMockClientWithEventEmitter({
             checkSecretStorageKey: jest.fn(),
-            isValidRecoveryKey: jest.fn(),
         });
     });
 
     it("Closes the dialog when the form is submitted with a valid key", async () => {
         mockClient.checkSecretStorageKey.mockResolvedValue(true);
-        mockClient.isValidRecoveryKey.mockReturnValue(true);
 
         const onFinished = jest.fn();
         const checkPrivateKey = jest.fn().mockResolvedValue(true);
@@ -114,7 +112,6 @@ describe("AccessSecretStorageDialog", () => {
         };
         const checkPrivateKey = jest.fn().mockResolvedValue(false);
         renderComponent({ checkPrivateKey, keyInfo });
-        mockClient.isValidRecoveryKey.mockReturnValue(false);
 
         await enterSecurityKey("Security Phrase");
         expect(screen.getByPlaceholderText("Security Phrase")).toHaveValue(securityKey);