codeant-ai-for-open-source[bot] commented on PR #35021:
URL: https://github.com/apache/superset/pull/35021#issuecomment-4008648513
## **Sequence Diagram**
Shows the new flow where alert/report email links are rewritten to a
redirect endpoint; the backend either redirects internal links immediately or
serves a frontend warning page for external links, and the frontend
confirms/trusts then navigates to the target.
```mermaid
sequenceDiagram
participant AlertsService
participant EmailClient as "User (Email Client)"
participant RedirectEndpoint as "Backend /redirect"
participant RedirectUI as "Frontend RedirectWarning"
AlertsService->>EmailClient: Send email with links rewritten to
/redirect/?url=TARGET
EmailClient->>RedirectEndpoint: User clicks link (/redirect/?url=TARGET)
RedirectEndpoint->>RedirectEndpoint: Validate URL & scheme
alt Internal or same-host
RedirectEndpoint-->>EmailClient: 302 redirect to TARGET
else External
RedirectEndpoint-->>RedirectUI: Render warning page with TARGET
RedirectUI-->>EmailClient: Show confirmation UI
EmailClient->>RedirectUI: User clicks Continue (optionally trust)
RedirectUI->>EmailClient: Navigate to TARGET (and optionally save
trusted URL)
end
```
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