fix(ai-help): handle invalid chat ids correctly

[argl]

Summary

This fixes an issue where an AI Help URL with a chat id parameter (&c=...) is being requested and the chat referenced either

• has been deleted
• does belong to a different user

While not leaking information to unauthorized accounts, there were a set of of confusing errors displayed.

The behaviour now has changed. If the chat belongs to a different user or has been deleted, the backend's 404 response is being catched and the user gets a fresh AI Help chat with the parameter cleared from the URL.

We also clear the plate if history is disabled for the user.

(MP-1455)

How did you test this change?

1

• With history enabled, create a chat. Click on the corresponding history item to include the chat id parameter in the URL.
• Copy/note down the URL
• Log in to another account
• Paste the URL from above
• Response is a pristine AI Help page and the parameter has been cleared from the URL.

2

• Log in to the original account
• Delete the chat from the history
• Paste the URL from above
• Response is a pristine AI Help page and the parameter has been cleared from the URL.

3

• Log into the original account
• Turn off history
• Paste the URL from above
• Response is a pristine AI Help page and the parameter has been cleared from the URL.

4

• Log into the secondary account
• Turn history off
• Paste in the URL from above
• Response is a pristine AI Help page and the parameter has been cleared from the URL.

[LeoMcA]

Looks fine, but might be possible to do this with useSearchParams directly.

Also missing a useEffect depencency

[LeoMcA]

I think it might be possible to just use useSearchParams if the docs can be believed:

The setSearchParams function works like navigate, but only for the search portion of the URL. Also note that the second arg to setSearchParams is the same type as the second arg to navigate.
https://reactrouter.com/en/main/hooks/use-search-params

Something like:

const [_, setSearchParams] = useSearchParams();

...

setSearchParams(
  (searchParams) => {
    const x = new URLSearchParams(searchParams)
    x.delete("c")
    return x
  },
  { replace: true }
)