JavaScriptSolidServer · melvincarvalho · May 2, 2026 · May 2, 2026 · May 2, 2026
@@ -15,6 +15,7 @@ import {
 import { emitChange } from '../notifications/events.js';
 import { checkIfMatch, checkIfNoneMatchForGet, checkIfNoneMatchForWrite } from '../utils/conditional.js';
 import { generateDatabrowserHtml, generateModuleDatabrowserHtml, shouldServeMashlib, DATA_ISLAND_MAX_BYTES } from '../mashlib/index.js';
+import { turtleToJsonLd } from '../rdf/turtle.js';
 
 /**
  * Live reload script - injected into HTML when --live-reload is enabled
@@ -330,23 +331,58 @@ export async function handleGet(request, reply) {
   // Check if we should serve Mashlib data browser
   // Only for RDF resources when Accept: text/html is requested
   if (shouldServeMashlib(request, request.mashlibEnabled, storedContentType)) {
-    // Phase 1 of #7: embed the resource's JSON-LD bytes as a data
-    // island when it's already JSON-LD (the JSS-native format). Other
-    // formats are out of Phase-1 scope; the wrapper still loads
-    // correctly and mashlib XHR-fetches as before.
+    // #7 / #344: embed the resource as a JSON-LD data island so
+    // non-mashlib consumers (search-engine rich-results, archival
+    // crawlers) get the data without a second request, and so the
+    // shape is uniform regardless of the URL extension.
     //
-    // Cap-aware short-circuit: skip the read entirely when the file is
-    // already over the embed cap. The island would be dropped anyway,
-    // and large JSON-LD resources would otherwise load into memory on
-    // every HTML navigation.
+    // JSS stores all RDF as JSON-LD on disk (PUT converts Turtle/N3
+    // before write — see the conneg branch in handlePut), so for
+    // `.ttl` / `.n3` URLs the bytes on disk are usually already
+    // JSON-LD. Try JSON parse first; only fall back to a Turtle parse
+    // when that fails (covers files placed on the filesystem
+    // out-of-band in their native format).
+    //
+    // Cap-aware short-circuit: skip the read entirely when the file
+    // is already over the embed cap. The island would be dropped
+    // anyway, and large RDF resources would otherwise load into
+    // memory on every HTML navigation. Other formats (rdf+xml, etc.)
+    // are not handled — the wrapper still loads and mashlib
+    // XHR-fetches them as before.
+    const islandConvertible =
+      storedContentType === RDF_TYPES.JSON_LD ||
+      storedContentType === RDF_TYPES.TURTLE ||
+      storedContentType === RDF_TYPES.N3;
     let embedJsonLd;
-    if (storedContentType === 'application/ld+json' &&
-        stats.size <= DATA_ISLAND_MAX_BYTES) {
-      // dataIsland() in mashlib/index.js coerces Buffer → string itself,
-      // so we hand it the Buffer directly instead of allocating a UTF-8
-      // string copy on every navigation.
+    if (islandConvertible && stats.size <= DATA_ISLAND_MAX_BYTES) {
       const buf = await storage.read(storagePath);
-      if (buf) embedJsonLd = buf;
+      if (buf) {
+        if (storedContentType === RDF_TYPES.JSON_LD) {
+          // Pass the Buffer through. dataIsland() decodes once when
+          // it needs to; we don't pre-validate or pre-decode here.
+          embedJsonLd = buf;
+        } else {
+          // Turtle / N3 URL. JSS stores everything as JSON-LD on
+          // disk (PUT converts), so try JSON parse first and pass
+          // the *decoded text* through (avoids a second decode
+          // inside dataIsland's String() coercion). Fall back to a
+          // Turtle parse for files placed on the filesystem
+          // out-of-band in their native format.
+          const text = buf.toString('utf8');
+          try {
+            JSON.parse(text);
+            embedJsonLd = text;
+          } catch {
+            try {
+              const jsonLd = await turtleToJsonLd(text, resourceUrl);
+              embedJsonLd = JSON.stringify(jsonLd);
+            } catch {
+              // Both parses failed → drop the island. The wrapper
+              // still renders and mashlib XHR-fetches the original.
+            }
+          }
+        }
+      }
     }
     const html = request.mashlibModule
       ? generateModuleDatabrowserHtml(request.mashlibModule, resourceUrl, { embedJsonLd })

@@ -16,6 +16,8 @@
 
 import { describe, it, before, after } from 'node:test';
 import assert from 'node:assert';
+import fs from 'node:fs/promises';
+import path from 'node:path';
 import {
   startTestServer,
   stopTestServer,
@@ -207,3 +209,85 @@ describe('mashlib data island — integration (#7)', () => {
     assert.doesNotMatch(body, /<!doctype html>/i);
   });
 });
+
+// #344: data island also covers Turtle and N3 stored resources, by
+// parsing them server-side and re-emitting the body as JSON-LD inside
+// the script tag. Embedded shape is uniform across stored formats.
+describe('mashlib data island — Turtle/N3 translation (#344)', () => {
+  before(async () => {
+    await startTestServer({ mashlibCdn: true, conneg: true });
+    await createTestPod('turtleisland');
+    await request('/turtleisland/public/note.ttl', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'text/turtle' },
+      body: '@prefix foaf: <http://xmlns.com/foaf/0.1/> .\n' +
+            '<#note> foaf:name "turtle island" .\n',
+      auth: 'turtleisland'
+    });
+    await request('/turtleisland/public/note.n3', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'text/n3' },
+      body: '@prefix foaf: <http://xmlns.com/foaf/0.1/> .\n' +
+            '<#note> foaf:name "n3 island" .\n',
+      auth: 'turtleisland'
+    });
+    // The both-parses-fail branch in the handler is unreachable via
+    // HTTP — handlePut validates Turtle/N3 input and rejects malformed
+    // bodies with 400 before they ever reach storage. To exercise the
+    // defensive guard we plant a file directly on disk in the test
+    // data dir, mimicking the "out-of-band placement" case the
+    // production code handles.
+    const brokenPath = path.resolve('./data/turtleisland/public/broken.ttl');
+    await fs.writeFile(
+      brokenPath,
+      '@prefix foaf: <http://xmlns.com/foaf/0.1/>\n' +
+      '<#note> foaf:name "broken — missing dot above" .\n'
+    );
+  });
+
+  after(async () => { await stopTestServer(); });
+
+  it('a browser GET to a Turtle resource embeds parsed JSON-LD', async () => {
+    const res = await request('/turtleisland/public/note.ttl', {
+      headers: { Accept: 'text/html,application/xhtml+xml,*/*;q=0.8' }
+    });
+    assertStatus(res, 200);
+    assertHeaderContains(res, 'Content-Type', 'text/html');
+    const body = await res.text();
+    assert.match(body, /id="dataisland"/);
+    assert.match(body, /<script type="application\/ld\+json"/);
+    // The Turtle name literal must round-trip into the embedded JSON-LD.
+    assert.match(body, /"turtle island"/);
+    // No raw Turtle prefix syntax should leak into the script body.
+    assert.doesNotMatch(body, /id="dataisland"[^>]*>[^<]*@prefix/);
+  });
+
+  it('a browser GET to an N3 resource embeds parsed JSON-LD', async () => {
+    const res = await request('/turtleisland/public/note.n3', {
+      headers: { Accept: 'text/html,application/xhtml+xml,*/*;q=0.8' }
+    });
+    assertStatus(res, 200);
+    assertHeaderContains(res, 'Content-Type', 'text/html');
+    const body = await res.text();
+    assert.match(body, /id="dataisland"/);
+    assert.match(body, /"n3 island"/);
+  });
+
+  it('out-of-band malformed Turtle drops the island, wrapper still renders', async () => {
+    // File was planted on disk directly (in `before`), bypassing the
+    // PUT validator. The handler's two-stage parse (JSON, then Turtle)
+    // both fail; the island is dropped silently and the mashlib
+    // wrapper is still served so the browser can XHR-fetch the
+    // resource and surface the parse problem to the user.
+    const res = await request('/turtleisland/public/broken.ttl', {
+      headers: { Accept: 'text/html,application/xhtml+xml,*/*;q=0.8' }
+    });
+    assertStatus(res, 200);
+    assertHeaderContains(res, 'Content-Type', 'text/html');
+    const body = await res.text();
+    assert.doesNotMatch(body, /id="dataisland"/,
+      'island must drop when both JSON and Turtle parses fail');
+    assert.match(body, /<!doctype html>/i);
+    assert.match(body, /mashlib/);
+  });
+});