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feat(activity): Markdown rendering for descriptions

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Activity descriptions now render through a small marked + DOMPurify
pipeline. Client-side only — the server keeps storing raw markdown
source, private descriptions stay inside the encrypted payload.

frontend/src/lib/markdown.ts exposes a single renderMarkdown(src)
helper. Allowlist: p / br / hr / strong / em / del / s / code / pre /
ul / ol / li / blockquote / a / h3–h6. URL scheme allowlist:
http(s) and mailto. Images are deliberately stripped — external
image URLs leak the viewer's IP to the linker's host. Raw HTML
pass-through is off. A DOMPurify afterSanitizeAttributes hook forces
target="_blank" rel="noopener noreferrer ugc" on every <a>, matching
the existing external-link pattern in PublicList. h1/h2 in the
source get downshifted to h3 via walkTokens so the description's
heading hierarchy doesn't collide with the SPA's own <h1>/<h2>.

Render sites: the two description spots in ActivityRow.svelte (one
for the decrypted private branch, one for non-private). New
.md class in styles.css gives the rendered block tight spacing,
discreet code/pre/blockquote treatment, accent-coloured links.

UX: a "Du kan bruke Markdown — **fet**, *kursiv*, [lenke](https://…),
lister med -" hint under the textarea in ActivityForm. No preview
pane to keep scope contained.

Tests: 14 cases in tests/markdown.test.ts covering the allowlist
(bold/italic/strike/lists/links/mailto), the sanitisation surface
(javascript: / data: / script / iframe / on* handlers / images),
and the h1/h2 → h3 downshift. happy-dom is registered locally in
beforeAll (and the markdown module dynamic-imported) rather than as
a project-wide preload — the latter overrides fetch/Request/Response
and breaks Bun-fetch-based API tests in other files.

Bundle impact: marked + dompurify add ~60KB to the SPA bundle.
This commit is contained in:
Ole-Morten Duesund 2026-05-25 21:15:31 +02:00
commit 1c95dbed00
7 changed files with 276 additions and 2 deletions
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bun.lock
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@ -5,14 +5,18 @@
"": {
"name": "vinterliste",
"dependencies": {
"dompurify": "^3.4.5",
"hono": "^4.6.0",
"libsodium-wrappers-sumo": "^0.7.15",
"marked": "^18.0.4",
"svelte-dnd-action": "^0.9.69",
},
"devDependencies": {
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"@sveltejs/vite-plugin-svelte": "^5.0.0",
"@tsconfig/svelte": "^5.0.4",
"@types/bun": "^1.1.0",
"@types/dompurify": "^3.2.0",
"@types/libsodium-wrappers-sumo": "^0.7.8",
"svelte": "^5.0.0",
"svelte-check": "^4.0.0",
@ -74,6 +78,8 @@
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@ -144,6 +150,8 @@
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@ -154,6 +162,10 @@
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"@types/whatwg-mimetype": ["@types/whatwg-mimetype@3.0.2", "", {}, "sha512-c2AKvDT8ToxLIOUlN51gTiHXflsfIFisS4pO7pDPoKouJCESkhZnEy623gwP9laCy5lnLDAw1vAzu2vM2YLOrA=="],
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"aria-query": ["aria-query@5.3.1", "", {}, "sha512-Z/ZeOgVl7bcSYZ/u/rh0fOpvEpq//LZmdbkXyc7syVzjPAhfOa9ebsdTSjEBDU4vs5nC98Kfduj1uFo0qyET3g=="],
@ -172,6 +184,10 @@
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"dompurify": ["dompurify@3.4.5", "", { "optionalDependencies": { "@types/trusted-types": "^2.0.7" } }, "sha512-OrwIBKsdNSVEeubdJ1HBv/wNENRM9ytAVCv7YXt//A3vPdVMNuACRqK9mXCGCBW2ln7BT/A4X0jXHo2Gu89miA=="],
"entities": ["entities@7.0.1", "", {}, "sha512-TWrgLOFUQTH994YUyl1yT4uyavY5nNB5muff+RtWaqNVCAK408b5ZnnbNAUEWLTCpum9w6arT70i1XdQ4UeOPA=="],
"esbuild": ["esbuild@0.25.12", "", { "optionalDependencies": { "@esbuild/aix-ppc64": "0.25.12", "@esbuild/android-arm": "0.25.12", "@esbuild/android-arm64": "0.25.12", "@esbuild/android-x64": "0.25.12", "@esbuild/darwin-arm64": "0.25.12", "@esbuild/darwin-x64": "0.25.12", "@esbuild/freebsd-arm64": "0.25.12", "@esbuild/freebsd-x64": "0.25.12", "@esbuild/linux-arm": "0.25.12", "@esbuild/linux-arm64": "0.25.12", "@esbuild/linux-ia32": "0.25.12", "@esbuild/linux-loong64": "0.25.12", "@esbuild/linux-mips64el": "0.25.12", "@esbuild/linux-ppc64": "0.25.12", "@esbuild/linux-riscv64": "0.25.12", "@esbuild/linux-s390x": "0.25.12", "@esbuild/linux-x64": "0.25.12", "@esbuild/netbsd-arm64": "0.25.12", "@esbuild/netbsd-x64": "0.25.12", "@esbuild/openbsd-arm64": "0.25.12", "@esbuild/openbsd-x64": "0.25.12", "@esbuild/openharmony-arm64": "0.25.12", "@esbuild/sunos-x64": "0.25.12", "@esbuild/win32-arm64": "0.25.12", "@esbuild/win32-ia32": "0.25.12", "@esbuild/win32-x64": "0.25.12" }, "bin": { "esbuild": "bin/esbuild" } }, "sha512-bbPBYYrtZbkt6Os6FiTLCTFxvq4tt3JKall1vRwshA3fdVztsLAatFaZobhkBC8/BrPetoa0oksYoKXoG4ryJg=="],
"esm-env": ["esm-env@1.2.2", "", {}, "sha512-Epxrv+Nr/CaL4ZcFGPJIYLWFom+YeV1DqMLHJoEd9SYRxNbaFruBwfEX/kkHUJf55j2+TUbmDcmuilbP1TmXHA=="],
@ -182,6 +198,8 @@
"fsevents": ["fsevents@2.3.3", "", { "os": "darwin" }, "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw=="],
"happy-dom": ["happy-dom@20.9.0", "", { "dependencies": { "@types/node": ">=20.0.0", "@types/whatwg-mimetype": "^3.0.2", "@types/ws": "^8.18.1", "entities": "^7.0.1", "whatwg-mimetype": "^3.0.0", "ws": "^8.18.3" } }, "sha512-GZZ9mKe8r646NUAf/zemnGbjYh4Bt8/MqASJY+pSm5ZDtc3YQox+4gsLI7yi1hba6o+eCsGxpHn5+iEVn31/FQ=="],
"hono": ["hono@4.12.23", "", {}, "sha512-eIaZ9qDgu7XV0pxOCrg7/WhnQ6Ivm22UcxhXx/A3dcbqbbYgBEkc6e/J/s7j2tS96zoB0S9VBdLwQNCWwUo4LA=="],
"is-reference": ["is-reference@3.0.3", "", { "dependencies": { "@types/estree": "^1.0.6" } }, "sha512-ixkJoqQvAP88E6wLydLGGqCJsrFUnqoH6HnaczB8XmDH1oaWU+xxdptvikTgaEhtZ53Ky6YXiBuUI2WXLMCwjw=="],
@ -196,6 +214,8 @@
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"ms": ["ms@2.1.3", "", {}, "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="],
@ -232,6 +252,10 @@
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