Adds an htmlEmbed block node that renders and executes raw HTML/CSS/JS in the
wiki origin (e.g. an analytics tracker) — the owner-chosen variant C. Because
this is stored-XSS by design, only workspace admins/owners may get such a node
persisted; everyone executes it when reading.
- Node (editor-ext): htmlEmbed atom/isolating block; source stored base64 in
data-source for lossless HTML<->JSON round-trip. renderHTML emits only the
encoded marker (never inlines raw markup), so generateHTML/export/search are
not themselves injection vectors. Registered in BOTH client extensions and
server tiptapExtensions. Markdown round-trip via an <!--html-embed:b64-->
comment (turndown) + a marked rule.
- Client NodeView: injects source and re-creates <script> elements so they
actually run; edit modal; renders in read-only/share too. Slash item is
admin-gated (adminOnly filtered by the user's workspace role).
- SERVER ENFORCEMENT (the real control — UI gating alone is insufficient):
stripHtmlEmbedNodes() removes htmlEmbed from any document persisted by a
non-admin, applied at every write path that introduces content from an
untrusted author: collab onStoreDocument, REST/MCP/AI updatePageContent,
single-file import, zip/multi-file import, page duplication, and transclusion
unsync. Page restore introduces no new content. Public share/readonly viewers
render fetched (already-stripped) content and do NOT open a collab socket, so
the only residual is a transient broadcast window to concurrent authenticated
editors (documented).
Implements docs/arbitrary-html-embed-plan.md (variant C).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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