Chore: removes props mutation (#2056)

While investigating some potential mutations
[here](https://ops.grafana-ops.net/d/83f4951f-2ef3-4260-91a0-39a031992b75/getmutationobserverproxy-logs)
I was able to find these mutating
[lines](https://github.com/grafana/grafana-zabbix/blob/main/src/datasource/components/ConfigEditor.tsx#L55-L57)

Although this works right now, this might not work in future Grafana
versions. This PR makes sure we don't mutate the props.

I haven't been able to test this manually so I could use some help to
make sure the plugin works as expected.

---------

Co-authored-by: ivanahuckova <ivana.huckova@gmail.com>

src/datasource/components/ConfigEditor.test.tsx

@@ -0,0 +1,102 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import { ConfigEditor, Props } from './ConfigEditor';
+
+jest.mock('@grafana/runtime', () => ({
+  ...jest.requireActual('@grafana/runtime'),
+  config: {},
+}));
+
+describe('ConfigEditor', () => {
+  describe('on initial render', () => {
+    it('should not mutate the options object', () => {
+      const options = Object.freeze({ ...getDefaultOptions() }); // freezing the options to prevent mutations
+      Object.freeze(options.jsonData);
+      Object.freeze(options.secureJsonData);
+      Object.freeze(options.secureJsonFields);
+      const onOptionsChangeSpy = jest.fn();
+
+      expect(() => render(<ConfigEditor options={options} onOptionsChange={onOptionsChangeSpy} />)).not.toThrow();
+    });
+
+    it('should call onOptionsChange with the correct values', () => {
+      const options = Object.freeze({ ...getDefaultOptions() }); // freezing the options to prevent mutations
+      Object.freeze(options.jsonData);
+      Object.freeze(options.secureJsonData);
+      Object.freeze(options.secureJsonFields);
+      const onOptionsChangeSpy = jest.fn();
+
+      expect(() => render(<ConfigEditor options={options} onOptionsChange={onOptionsChangeSpy} />)).not.toThrow();
+      expect(onOptionsChangeSpy).toBeCalledTimes(1);
+      expect(onOptionsChangeSpy).toHaveBeenCalledWith({
+        ...getDefaultOptions(),
+        jsonData: {
+          ...getDefaultOptions().jsonData,
+          authType: 'userLogin',
+          timeout: undefined,
+          password: undefined, // password should be missing from jsonData
+        },
+        secureJsonData: {
+          ...getDefaultOptions().secureJsonData,
+          password: 'a password', // password should be present in secureJsonData
+        },
+      });
+    });
+
+    it('should not update password in secureJsonData if the field already exists in secureJsonFields', () => {
+      const options = Object.freeze({ ...getDefaultOptions(), secureJsonFields: { password: true } }); // freezing the options to prevent mutations
+      Object.freeze(options.jsonData);
+      Object.freeze(options.secureJsonData);
+      Object.freeze(options.secureJsonFields);
+      const onOptionsChangeSpy = jest.fn();
+
+      expect(() => render(<ConfigEditor options={options} onOptionsChange={onOptionsChangeSpy} />)).not.toThrow();
+      expect(onOptionsChangeSpy).toBeCalledTimes(1);
+      expect(onOptionsChangeSpy).toHaveBeenCalledWith({
+        ...getDefaultOptions(),
+        jsonData: {
+          ...getDefaultOptions().jsonData,
+          authType: 'userLogin',
+          timeout: undefined,
+          password: undefined, // password should be missing from jsonData
+        },
+        secureJsonData: {}, // password should be missing from secureJsonData
+        secureJsonFields: { ...getDefaultOptions().secureJsonFields, password: true },
+      });
+    });
+  });
+});
+
+function getDefaultOptions(): Props['options'] {
+  return {
+    id: 1,
+    orgId: 1,
+    uid: '',
+    name: '',
+    typeLogoUrl: '',
+    type: '',
+    typeName: '',
+    access: '',
+    url: '',
+    user: '',
+    database: '',
+    basicAuth: false,
+    basicAuthUser: '',
+    isDefault: false,
+    jsonData: {
+      cacheTTL: '',
+      dbConnectionEnable: false,
+      disableDataAlignment: false,
+      disableReadOnlyUsersAck: false,
+      trends: false,
+      trendsFrom: '',
+      trendsRange: '',
+      username: '',
+      password: 'a password',
+    },
+    readOnly: false,
+    secureJsonData: {},
+    secureJsonFields: {},
+    withCredentials: false,
+  };
+}

src/datasource/components/ConfigEditor.tsx

@@ -50,11 +50,11 @@ export const ConfigEditor = (props: Props) => {
 
     // Set secureJsonFields.password to password and then remove it from config
     const { password, ...restJsonData } = jsonData;
+
+    // Create new secureJsonData object
+    const newSecureJsonData = { ...options.secureJsonData };
     if (!secureJsonFields?.password) {
-      if (!options.secureJsonData) {
-        options.secureJsonData = {};
-      }
-      options.secureJsonData.password = password;
+      newSecureJsonData.password = password;
     }
 
     onOptionsChange({
@@ -69,6 +69,7 @@ export const ConfigEditor = (props: Props) => {
         disableDataAlignment: false,
         ...restJsonData,
       },
+      secureJsonData: { ...newSecureJsonData },
     });
 
     if (options.jsonData.dbConnectionEnable) {

src/test-setup/jest-setup.js

@@ -1,4 +1,7 @@
 import { PanelCtrl, MetricsPanelCtrl } from './panelStub';
+import { TextEncoder, TextDecoder } from 'util';
+
+Object.assign(global, { TextDecoder, TextEncoder });
 
 jest.mock(
   'grafana/app/features/templating/template_srv',