codeant-ai-for-open-source[bot] commented on PR #35021:
URL: https://github.com/apache/superset/pull/35021#issuecomment-4012698724
## **Sequence Diagram**
Shows how alert/report email links are rewritten to a redirect endpoint when
messages are generated, and how the backend redirect view either forwards
internal links immediately or serves a frontend warning page that the user
confirms before navigating to external sites.
```mermaid
sequenceDiagram
participant EmailGenerator
participant LinkProcessor
participant Recipient (Browser)
participant Backend (RedirectView)
participant Frontend (RedirectWarning)
EmailGenerator->>LinkProcessor: process_html_links(description) ->
rewrite external hrefs to /redirect/?url=...
LinkProcessor-->>EmailGenerator: rewritten HTML
EmailGenerator-->>Recipient: send email with rewritten links
Recipient->>Backend: GET /redirect/?url=https://external.example/page
Backend->>Backend: validate URL, block dangerous schemes
alt internal host
Backend-->>Recipient: 302 redirect to internal URL
else external host
Backend-->>Recipient: 200 render RedirectWarning app
Recipient->>Frontend: load warning page (reads ?url)
alt URL trusted in localStorage
Frontend-->>Recipient: navigate directly to target URL
else
Frontend-->>Recipient: show confirmation UI; on Continue
optionally save trust and navigate to target
end
end
```
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