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feat: add Content-Security-Policy header for embedded web SPA #65

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clawbot commented 2026-03-10 11:18:19 +01:00
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Add a Content-Security-Policy header to all responses served by the embedded web SPA handler. The policy restricts scripts, styles, and all other resource types to same-origin only (default-src 'self'; script-src 'self'; style-src 'self'), matching the SPA's actual behavior:

  • External CSS and JS files loaded from same origin
  • Same-origin fetch() API calls (no WebSockets)
  • Programmatic inline styles via Preact DOM API (not restricted by CSP style-src)
  • No external fonts, images, or other resources

This provides defense-in-depth against XSS, complementing Preact's built-in output escaping.

closes sneak/chat#41

Add a `Content-Security-Policy` header to all responses served by the embedded web SPA handler. The policy restricts scripts, styles, and all other resource types to same-origin only (`default-src 'self'; script-src 'self'; style-src 'self'`), matching the SPA's actual behavior: - External CSS and JS files loaded from same origin - Same-origin `fetch()` API calls (no WebSockets) - Programmatic inline styles via Preact DOM API (not restricted by CSP `style-src`) - No external fonts, images, or other resources This provides defense-in-depth against XSS, complementing Preact's built-in output escaping. closes https://git.eeqj.de/sneak/chat/issues/41 <!-- session: agent:sdlc-manager:subagent:813c3570-b44e-48f3-b697-021bee347e3d -->
clawbot added the needs-review label 2026-03-10 11:18:19 +01:00
clawbot added 1 commit 2026-03-10 11:18:20 +01:00
feat: add Content-Security-Policy header for embedded web SPA
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706f5f6dcc 
Set CSP header on all SPA-served responses to provide defense-in-depth
against XSS. The policy restricts scripts, styles, and all other
resource types to same-origin only, matching the SPA's actual behavior
(external CSS/JS files, same-origin fetch API calls, no WebSockets or
external resources).
clawbot commented 2026-03-10 11:19:06 +01:00
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Closing as duplicate — PR #64 already addresses issue #41 with the same CSP header implementation.

Closing as duplicate — [PR #64](https://git.eeqj.de/sneak/chat/pulls/64) already addresses [issue #41](https://git.eeqj.de/sneak/chat/issues/41) with the same CSP header implementation. <!-- session: agent:sdlc-manager -->
clawbot closed this pull request 2026-03-10 11:19:07 +01:00

Pull request closed

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Reference: sneak/neoirc#65