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feat(webapp): mermaid fences render as diagrams, in the viewer and on share pages (BEA-91) (#143)

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A ```mermaid fence rendered as a wall of `graph TD` source on both surfaces.
It now renders as an SVG in the hub file viewer and on public /s/<token>
markdown share pages.

Mermaid ships inside the binary (no CDN, so air-gapped self-hosters keep
working) and is imported lazily: a document with no fence downloads none of
it. A fence that doesn't parse — the common case for hand-written wiki
diagrams — keeps today's <pre><code> plus a small note, and one bad fence
never stops the good ones beside it. A blocked or offline chunk lands in the
same place.

The share page is the harder half: it is server-rendered Go HTML with no
JavaScript, and its `sandbox allow-scripts` CSP makes the origin opaque, so a
module script and every import() it makes arrive with `Origin: null`. The CSP
is unchanged and gains no allow-same-origin; instead the real-asset branch of
frontend() now sets Access-Control-Allow-Origin, which only ever touches files
that are already public and cookie-less. The script tag itself is injected
only when the rendered document actually contains a fence.

Also fixes an embed bug this change surfaced: `//go:embed static` silently
skips names beginning with `_`, and Vite's first shared chunk is
`_commonjsHelpers-<hash>.js`. The build passed, the commit looked right, and
the served app was blank. It is `all:static` now, with a test that every file
on disk is in the binary.
This commit is contained in:
Snow Lee (Sungwon)
2026-08-10 14:18:18 -07:00
committed by GitHub
parent 4031495c81
commit 2875e033be
86 changed files with 5070 additions and 30 deletions
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web/docs/src/content/docs/reference/hub-config.md
+2 -2
View File
@@ -4,8 +4,8 @@ description: Every bdrive serve flag and config-file key.
---
`bdrive serve` serves a website — browse folders and files, read markdown rendered
Obsidian-style (including `[[wikilinks]]`, task lists, and tables), download any
file. Pointed at a storage root, it becomes a multi-project sync hub.
Obsidian-style (including `[[wikilinks]]`, task lists, tables, and ```` ```mermaid ````
diagrams), download any file. Pointed at a storage root, it becomes a multi-project sync hub.
It is read-only unless started with `--upload`.