feat: add inline PDF viewer for Custom_PDF objects

Add a /pdf proxy route that forces Content-Disposition inline so PDFs render instead of downloading, and a web viewer that embeds the document in an iframe with a standalone open-in-new-tab link.

apps/proxy/src/index.ts

@@ -8,6 +8,7 @@ import { setGamesRoot } from './config.js';
 import asset from './routes/asset.js';
 import health from './routes/health.js';
 import items from './routes/items.js';
+import pdf from './routes/pdf.js';
 import search from './routes/search.js';
 import trace from './routes/trace.js';
 
@@ -27,6 +28,7 @@ app.route('/health', health);
 app.route('/search', search);
 app.route('/items', items);
 app.route('/asset', asset);
+app.route('/pdf', pdf);
 app.route('/trace', trace);
 
 serve(

apps/proxy/src/routes/pdf.test.ts

@@ -0,0 +1,65 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as path from 'node:path';
+import { mkdtempSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import pdf from './pdf.js';
+import { setGamesRoot } from '../config.js';
+
+let dir: string;
+
+beforeEach(() => {
+  dir = mkdtempSync(path.join(tmpdir(), 'games-'));
+  setGamesRoot(dir);
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  setGamesRoot(undefined);
+});
+
+describe('pdf route', () => {
+  it('rejects a missing url', async () => {
+    const res = await pdf.request('/');
+    expect(res.status).toBe(400);
+    expect(await res.json()).toEqual({ error: 'Missing url query param' });
+  });
+
+  it('rejects a non-http url', async () => {
+    const res = await pdf.request('/?url=file%3A%2F%2F%2Fetc%2Fpasswd');
+    expect(res.status).toBe(400);
+  });
+
+  it('streams the fetched pdf inline with a pdf content-type', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn().mockResolvedValue(
+        new Response(new Uint8Array([1, 2, 3]), {
+          headers: { 'content-type': 'application/pdf' },
+        }),
+      ),
+    );
+    const res = await pdf.request('/?url=https%3A%2F%2Fexample.com%2Fa.pdf');
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('application/pdf');
+    expect(res.headers.get('content-disposition')).toBe('inline');
+    expect(await res.arrayBuffer()).toEqual(new Uint8Array([1, 2, 3]).buffer);
+  });
+
+  it('returns 502 when the upstream fetch fails', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn().mockResolvedValue(new Response('error', { status: 500 })),
+    );
+    const res = await pdf.request('/?url=https%3A%2F%2Fexample.com%2Fa.pdf');
+    expect(res.status).toBe(502);
+  });
+
+  it('serves a local game asset from GAMES_ROOT', async () => {
+    writeFileSync(path.join(dir, 'rules.pdf'), new Uint8Array([1, 2, 3]));
+    const res = await pdf.request('/?url=rules.pdf');
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('application/pdf');
+    expect(res.headers.get('content-disposition')).toBe('inline');
+    expect(await res.arrayBuffer()).toEqual(new Uint8Array([1, 2, 3]).buffer);
+  });
+});

apps/proxy/src/routes/pdf.ts

@@ -0,0 +1,56 @@
+import { Hono } from 'hono';
+import { GAMES_ROOT } from '../config.js';
+import { resolveAsset } from './resolveAsset.js';
+
+const app = new Hono();
+
+/**
+ * Fetch a PDF and stream it back inline so the browser renders it instead of
+ * downloading. PDF hosts often send `Content-Disposition: attachment`, which
+ * forces a download even when the URL is opened in a tab or iframe. This route
+ * strips that header and forces `inline` so the PDF can be embedded in the web
+ * app's viewer. Like `/asset`, a relative URL (no scheme) is treated as a game
+ * asset path relative to `GAMES_ROOT`.
+ */
+app.get('/', async (c) => {
+  const raw = c.req.query('url');
+  if (!raw) {
+    return c.json({ error: 'Missing url query param' }, 400);
+  }
+
+  const result = await resolveAsset(raw, GAMES_ROOT);
+  if (!result.ok) {
+    return c.json(
+      { error: result.reason === 'not-found' ? 'Asset not found' : 'Invalid url query param' },
+      result.reason === 'not-found' ? 404 : 400,
+    );
+  }
+  const asset = result.asset;
+
+  // A local game asset is streamed from disk; a remote one is fetched.
+  let body: BodyInit;
+  if (asset.stream) {
+    body = asset.stream as unknown as BodyInit;
+  } else {
+    let res: Response;
+    try {
+      res = await fetch(asset.url!);
+    } catch (err) {
+      return c.json({ error: `Failed to fetch pdf: ${String(err)}` }, 502);
+    }
+    if (!res.ok) {
+      return c.json({ error: `Pdf responded ${res.status}` }, 502);
+    }
+    body = res.body!;
+  }
+
+  return new Response(body, {
+    headers: {
+      'Content-Type': 'application/pdf',
+      'Content-Disposition': 'inline',
+      'Cache-Control': 'public, max-age=86400',
+    },
+  });
+});
+
+export default app;

apps/web/src/components/viewers/PdfViewer.tsx

@@ -0,0 +1,43 @@
+import type { TTSObject } from '@tts/shared';
+import { pdfUrl } from '@tts/http';
+
+/**
+ * A PDF document (`Custom_PDF`). Renders the document inline in an iframe and
+ * offers a standalone link to open it in a new tab. The URL is routed through
+ * the proxy `/pdf` endpoint, which forces `Content-Disposition: inline` so the
+ * browser displays the PDF instead of downloading it.
+ */
+export default function PdfViewer({ object }: { object: TTSObject }) {
+  const url = object.CustomPDF?.PDFUrl;
+
+  if (!url) {
+    return (
+      <p className="text-sm text-zinc-500">
+        This object has no PDF URL.
+      </p>
+    );
+  }
+
+  const proxied = pdfUrl(url);
+
+  return (
+    <div className="space-y-3">
+      <div className="flex items-center justify-between gap-2">
+        <p className="truncate font-mono text-xs text-zinc-500">{url}</p>
+        <a
+          href={proxied}
+          target="_blank"
+          rel="noreferrer"
+          className="shrink-0 rounded-lg bg-zinc-100 px-3 py-1.5 text-sm font-medium text-zinc-900 hover:bg-zinc-300"
+        >
+          Open PDF in new tab
+        </a>
+      </div>
+      <iframe
+        src={proxied}
+        title="PDF preview"
+        className="h-[70vh] w-full rounded-lg border border-zinc-800 bg-zinc-950"
+      />
+    </div>
+  );
+}

apps/web/src/components/viewers/register.ts

@@ -9,6 +9,7 @@ const TileViewer = lazy(() => import('./TileViewer'));
 const TokenViewer = lazy(() => import('./TokenViewer'));
 const CardViewer = lazy(() => import('./CardViewer'));
 const CustomModelViewer = lazy(() => import('./CustomModelViewer'));
+const PdfViewer = lazy(() => import('./PdfViewer'));
 
 registerViewer('Tile', TileViewer);
 registerViewer('Custom_Tile', TileViewer);
@@ -20,4 +21,5 @@ registerViewer('DeckCustom', CardViewer);
 registerViewer('Custom_Deck', CardViewer);
 registerViewer('Custom_Model', CustomModelViewer);
 registerViewer('Custom_Model_Bag', CustomModelViewer);
-registerViewer('Custom_Model_Infinite_Bag', CustomModelViewer);
+registerViewer('Custom_Model_Infinite_Bag', CustomModelViewer);
+registerViewer('Custom_PDF', PdfViewer);

apps/web/vite.config.ts

@@ -17,6 +17,7 @@ export default defineConfig({
       '/items': 'http://localhost:3000',
       '/health': 'http://localhost:3000',
       '/asset': 'http://localhost:3000',
+      '/pdf': 'http://localhost:3000',
       '/trace': 'http://localhost:3000',
     },
   },