impr: better email changing logs

!nuf

Author: Miodec

backend/__tests__/api/controllers/user.spec.ts

@@ -1068,7 +1068,7 @@ describe("user controller test", () => {
       );
       expect(addImportantLogMock).toHaveBeenCalledWith(
         "user_email_updated",
-        "changed email to [email protected]",
+        "changed email from [email protected] to [email protected]",
         uid
       );
     });

backend/src/api/controllers/user.ts

@@ -405,9 +405,10 @@ export async function updateEmail(
   req: MonkeyRequest<undefined, UpdateEmailRequestSchema>
 ): Promise<MonkeyResponse> {
   const { uid } = req.ctx.decodedToken;
-  let { newEmail } = req.body;
+  let { newEmail, previousEmail } = req.body;
 
   newEmail = newEmail.toLowerCase();
+  previousEmail = previousEmail.toLowerCase();
 
   try {
     await AuthUtil.updateUserEmail(uid, newEmail);
@@ -440,7 +441,7 @@ export async function updateEmail(
 
   void addImportantLog(
     "user_email_updated",
-    `changed email to ${newEmail}`,
+    `changed email from ${previousEmail} to ${newEmail}`,
     uid
   );