feat: add security headers to the Static Web App config#295
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Add a globalHeaders block to staticwebapp.config.json with an enforced Content-Security-Policy plus HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, a locked-down Permissions-Policy, and X-XSS-Protection: 0. The inline dark-mode theme script in index.html is pinned by a SHA-256 hash so script-src stays 'self'. connect-src/img-src/media-src use https: allowlists because the API host is environment-specific and Aquifer/avatar hosts vary; all HTTP/mixed content is still blocked.
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What
Adds a
globalHeadersblock tostaticwebapp.config.json(Azure Static Web Apps): an enforced Content-Security-Policy plus the standard hardening headers.Closes #291.
Headers
script-src 'self'+ a SHA-256 hash of the inline theme script;object-src 'none',base-uri 'self',frame-ancestors 'none',frame-src 'none'.style-srckeeps'unsafe-inline'(Radix/Tailwind inject inline styles) + cdnjs for the Inter font.connect-src/img-src/media-srcusehttps:allowlists (see notes).max-age=31536000; includeSubDomains),X-Content-Type-Options: nosniff,X-Frame-Options: DENY,Referrer-Policy: strict-origin-when-cross-origin, locked-downPermissions-Policy,X-XSS-Protection: 0.Verification
Built for production and loaded under these exact headers in a real browser:
http://localhost:9999API call (HTTPS in prod, so a non-issue).Notes for reviewers
connect-src/img-src/media-srcare intentionallyhttps:— the prod API host is env-specific and Aquifer/avatar image hosts vary. All HTTP/mixed content is still blocked. We can tightenconnect-srcto an explicit allowlist once the prod API host is settled.script-srchash is tied to the exact inline theme script inindex.html. If that script changes, recompute the hash (otherwise dark-mode init is blocked — benign FOUC, not a crash). CI builds on Node 24 reproduce the same hash.preload(preload is hard to reverse; COOP can break OAuth popups) — easy to add later if wanted.