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* MUL-3132: harden /uploads/* (auth, no listing, nosniff, tight CSP) Closes the open hardening items from the SVG XSS disclosure (security-findings-2026-06-02). The primary chain (PR #3023 / #3050) is intact; this PR addresses every remaining recommendation from the disclosure's hardening list except 'serve uploads from a separate origin' (a structural change beyond this fix). Changes: - /uploads/* now requires authentication. The route is wrapped in middleware.Auth so anonymous internet users can no longer fetch workspace attachments by guessing the URL. A new ServeLocalUpload handler then enforces the second layer: - workspaces/{wsID}/* paths require membership in wsID (uses MembershipCache for the hot path); - users/{userID}/* paths allow any authenticated user (avatars are referenced cross-workspace); - any other prefix returns 404, so a future feature cannot drop content under /uploads/<other-prefix>/ and inherit a relaxed policy by accident. Non-members see 404 (not 403) so the route does not act as an IDOR oracle for workspace IDs. - Directory listing on /uploads/* is rejected at the storage layer: empty keys, trailing-slash keys, and any key that resolves to a directory return 404 before http.ServeFile would render an HTML index. UUID filenames were obscurity, but enumerating them shouldn't be free. - Every successful /uploads/* response carries X-Content-Type-Options: nosniff and a tight per-response CSP (default-src 'none'; sandbox; frame-ancestors 'none'), overriding the application-wide CSP. This is belt-and-suspenders if a future regression weakens the Content-Disposition: attachment path. - UploadFile rejects HTML-family uploads at the edge (.html, .htm, .xhtml, .shtml, .xht, .phtml, plus a content-type denylist for text/html and application/xhtml+xml so renamed payloads cannot bypass the extension check). SVG and JS remain allowed because their existing serve-side defenses neutralize them and source-code attachments preview as text/plain via /api/attachments/{id}/content. Tests: - storage: TestLocalStorage_ServeFile_RejectsDirectoryListing, TestLocalStorage_ServeFile_HardeningHeaders. - handler: TestIsUploadDenied (pure), TestUploadFile_RejectsHTMLByExtension, TestUploadFile_RejectsHTMLByContentType, TestUploadFile_AllowsLegitimateImage, and the full ServeLocalUpload matrix (RequiresAuth, MemberCanRead, NonMemberDenied, RejectsDirectoryInPath, UnknownPrefixDenied, UserPrefixAllowsAnyAuthedUser). - Full server test suite passes. Co-authored-by: multica-agent <github@multica.ai> * MUL-3132: HMAC-signed query auth for /uploads/* (token-auth client compat) Addresses J's Request Changes review on PR #3903. Problem: PR #3903 wrapped /uploads/* in middleware.Auth, but native <img>/<video>/<iframe> resource loads cannot attach Authorization headers. Token-auth clients (Desktop default, legacy-token Web sessions, mobile) were breaking on inline attachment rendering even though the API itself authenticated fine. Fix: implement HMAC-signed query parameters for /uploads/*, mirroring S3 + CloudFront presigned URLs. - storage.SignLocalUploadURL(rawURL, key, secret, expiry) appends '?exp=<unix>&sig=<HMAC-SHA256(key|exp)>' query params; signature is bound to one specific key, has a TTL matching CloudFront mode (defaultAttachmentDownloadURLTTL = 30 min), constant-time compared on verify. - storage.VerifyLocalUploadSignature(key, exp, sig, secret, now) rejects expired, tampered, wrong-secret, and key-mismatched signatures. - ServeLocalUpload now has two auth paths: signed-query (no Auth middleware needed; signature itself is the authority) and Bearer/cookie (membership-gated as before). Partial signed-query fails closed. - The route in router.go dispatches between the two: if both exp+sig query params are present, route to inner handler unwrapped; else wrap in middleware.Auth. - attachmentToResponse appends signed query to URL when the storage backend is *LocalStorage. CloudFront-signed download URLs and S3 paths are unchanged. Tests: - storage: TestSignAndVerifyLocalUploadURL_RoundTrip, TestVerifyLocalUploadSignature_RejectsExpired, _RejectsTamperedSig, _BoundToKey, _RejectsWrongSecret, TestSignLocalUploadURL_PreservesExistingQuery, TestLocalUploadSignatureFromQuery_EmptyOnAbsence (7 pure tests). - handler: TestServeLocalUpload_{SignedQueryBypassesAuth, SignedQueryRejectsExpired, SignedQueryRejectsTampered, SignedQueryBoundToOneKey, PartialSignedQueryFailsClosed}, TestAttachmentToResponse_LocalStorageMintsSignedURL. Full server test suite passes. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: Eve <eve@multica-ai.local> Co-authored-by: multica-agent <github@multica.ai>