/previz: password protect, add PDF export of the crowd previz

- nginx basic auth on /previz/ (login file lives on the server, mounted
  from docker/auth/, see DEPLOY.md step 8); private, no-store so
  Cloudflare never caches it
- Print styles for previz pages: dark, A4 landscape, one section a page;
  videos print as poster frames with a link
- scripts/previz-pdf.mjs (npm run previz:pdf) prints the page to
  public/previz/crowd/crowd-previz.pdf via Edge/Chrome DevTools
- "PDF" download link on the page

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

@@ -7,3 +7,5 @@ content/*.mp4
 content/*.pdf
 *.md
 !README.md
+docker/auth
+content/crowd

.gitignore

@@ -52,3 +52,6 @@ content/*.mov
 
 # previz source renders (web versions in public/previz)
 content/crowd/
+
+# server-side login files for /previz/ (see DEPLOY.md)
+docker/auth/

DEPLOY.md

@@ -112,6 +112,22 @@ The workflow is already in the repo (`.gitea/workflows/deploy.yml`). In Gitea, o
 Test it: push any commit to `main` and watch **Actions** in the repo. The job should run
 `git pull` and `docker compose up -d --build`, then the site updates.
 
+### 8. Password for /previz/
+
+Client previz pages under `/previz/` need a login (HTTP basic auth in `docker/nginx.conf`).
+The password file stays on the server and is never committed. Create it once:
+
+```bash
+cd /opt/ttvfx_web
+mkdir -p docker/auth
+printf "production:$(openssl passwd -apr1)\n" > docker/auth/previz.htpasswd   # prompts for the password
+docker compose up -d --force-recreate
+```
+
+`production` is the username. To change the password, run the `printf` line again. nginx reads
+the file on every request, so no restart is needed. To add a second login, append another line
+with `>>`. If the file is missing, `/previz/` returns a 500 error, so it is never left open.
+
 ---
 
 ## Day to day

app/globals.css

@@ -89,6 +89,23 @@ body {
   .reveal { opacity: 1; transform: none; transition: none; }
 }
 
+/* Previz pages (/previz/*) print/PDF dark, edge to edge, like the screen version.
+   Margins come from padding cloned onto every page instead of white @page margins.
+   The page sets its own @page (landscape, no margin) so it doesn't get the report's. */
+@media print {
+  html:has(.previz), html:has(.previz) body { background: var(--ink) !important; color-scheme: dark; }
+  .previz {
+    padding-block: 12mm;
+    box-decoration-break: clone;
+    -webkit-box-decoration-break: clone;
+    print-color-adjust: exact;
+    -webkit-print-color-adjust: exact;
+  }
+  .previz.grain::after { display: none; }
+  .previz figure, .previz li, .previz img, .previz dl { break-inside: avoid; }
+  .previz h2 { break-after: avoid; }
+}
+
 /* Printable VFX report (/set/report/view): A4 paper, keep the accent colours */
 @media print {
   @page { size: A4; margin: 14mm 12mm; background: white; }

app/previz/crowd/page.tsx

@@ -162,10 +162,11 @@ const setTips: Tip[] = [
 function PreviewVideo({ src, poster, label }: { src?: string; poster?: string; label: string }) {
   if (src) {
     return (
+      <div>
         <video
           src={src}
           poster={poster}
-        className="aspect-[2.39/1] w-full bg-black object-cover"
+          className="aspect-[2.39/1] w-full bg-black object-cover print:hidden"
           controls
           autoPlay
           muted
@@ -173,6 +174,13 @@ function PreviewVideo({ src, poster, label }: { src?: string; poster?: string; l
           playsInline
           preload="metadata"
         />
+        {/* Paper/PDF: the poster frame and a pointer to the moving version */}
+        {/* eslint-disable-next-line @next/next/no-img-element */}
+        {poster && <img src={poster} alt={label} className="hidden aspect-[2.39/1] w-full object-cover print:block" />}
+        <p className="mt-2 hidden font-mono text-[10px] tracking-[0.2em] text-muted uppercase print:block">
+          ▶ Video: {site.url.replace(/^https?:\/\//, "")}/previz/crowd/
+        </p>
+      </div>
     );
   }
   return (
@@ -186,9 +194,9 @@ function PreviewVideo({ src, poster, label }: { src?: string; poster?: string; l
   );
 }
 
-function TipGrid({ tips }: { tips: Tip[] }) {
+function TipGrid({ tips, className = "" }: { tips: Tip[]; className?: string }) {
   return (
-    <ol className="mt-10 grid gap-px border border-line bg-line md:grid-cols-2">
+    <ol className={`mt-10 grid gap-px border border-line bg-line md:grid-cols-2 ${className}`}>
       {tips.map((c, i) => (
         <li key={c.title} className="flex gap-4 bg-ink p-5 md:p-6">
           <span className="font-mono text-xs text-accent">{String(i + 1).padStart(2, "0")}</span>
@@ -224,10 +232,20 @@ function Step({
 
 export default function CrowdPrevizPage() {
   return (
-    <main className="grain min-h-dvh bg-ink pb-24">
+    <main className="previz grain min-h-dvh bg-ink pb-24">
+      {/* Print/PDF: landscape A4, edge to edge. Inline so it beats the global @page rule. */}
+      <style>{"@page { size: A4 landscape; margin: 0; }"}</style>
       <header className="mx-auto flex max-w-6xl items-center gap-3 px-4 pt-6 md:px-8">
         <Fox className="h-6 w-6 text-accent" />
         <span className="font-mono text-[11px] tracking-[0.25em] text-muted uppercase">{site.name} · Previz</span>
+        {/* Regenerate with `npm run previz:pdf` after editing this page */}
+        <a
+          href={`${dir}/crowd-previz.pdf`}
+          download
+          className="-my-2 ml-auto py-2 font-mono text-[11px] tracking-[0.2em] text-accent uppercase hover:text-fg print:hidden"
+        >
+          PDF ↓
+        </a>
       </header>
 
       <section className="mx-auto max-w-6xl px-4 pt-16 md:px-8 md:pt-24">
@@ -254,7 +272,7 @@ export default function CrowdPrevizPage() {
         </dl>
       </section>
 
-      <section className="mx-auto mt-20 max-w-6xl px-4 md:mt-28 md:px-8">
+      <section className="mx-auto mt-20 max-w-6xl px-4 md:mt-28 md:px-8 print:!mt-0 print:break-before-page">
         <figure>
           <div className="relative">
             {/* eslint-disable-next-line @next/next/no-img-element */}
@@ -282,7 +300,7 @@ export default function CrowdPrevizPage() {
       </section>
 
       <div className="mx-auto mt-24 max-w-6xl space-y-24 px-4 md:mt-32 md:space-y-32 md:px-8">
-        <section className="space-y-10">
+        <section className="space-y-10 print:!mt-0 print:break-before-page">
           <Step index="01" label="Hero shot" title="One drone move, real crowd at the stage">
             <p>
               The drone starts behind the audience and flies forward toward the truck stage. Height and camera tilt stay
@@ -297,7 +315,7 @@ export default function CrowdPrevizPage() {
           <PreviewVideo src={videos.hero} poster={videos.heroPoster} label="Hero shot previz coming soon" />
         </section>
 
-        <section className="space-y-10">
+        <section className="space-y-10 print:!mt-0 print:break-before-page">
           <Step index="02" label="Crowd plates" title="Same spot, same angle, new arrangement">
             <p>
               After the hero shot, the drone flies to a single marked position and holds still. No camera movement. The
@@ -326,7 +344,7 @@ export default function CrowdPrevizPage() {
           </p>
         </section>
 
-        <section className="space-y-10">
+        <section className="space-y-10 print:!mt-0 print:break-before-page">
           <Step index="03" label="Composite" title="Plates placed into the moving shot">
             <p>
               We track the hero drone move in 3D, then place each plate as a flat layer on the ground behind the real
@@ -340,7 +358,7 @@ export default function CrowdPrevizPage() {
           <PreviewVideo src={videos.final} poster={videos.finalPoster} label="Final comp proof of concept coming soon" />
         </section>
 
-        <section>
+        <section className="print:!mt-0 print:break-before-page">
           <SectionLabel index="04">Shot list</SectionLabel>
           <h2 className="font-display text-3xl leading-none font-thin uppercase md:text-5xl">Six shots, two setups</h2>
           <p className="mt-6 max-w-3xl text-lg leading-relaxed font-light text-muted md:text-xl">
@@ -351,7 +369,7 @@ export default function CrowdPrevizPage() {
           </div>
         </section>
 
-        <section>
+        <section className="print:!mt-0 print:break-before-page">
           <SectionLabel index="05">Crowd direction</SectionLabel>
           <h2 className="font-display text-3xl leading-none font-thin uppercase md:text-5xl">Briefing the extras</h2>
           <p className="mt-6 max-w-3xl text-lg leading-relaxed font-light text-muted md:text-xl">
@@ -385,16 +403,16 @@ export default function CrowdPrevizPage() {
               the comp, so that&apos;s where arms need to stay down.
             </figcaption>
           </figure>
-          <TipGrid tips={crowdTips} />
+          <TipGrid tips={crowdTips} className="print:break-before-page" />
         </section>
 
-        <section>
+        <section className="print:!mt-0 print:break-before-page">
           <SectionLabel index="06">Camera</SectionLabel>
           <h2 className="font-display text-3xl leading-none font-thin uppercase md:text-5xl">Notes for DOP and drone op</h2>
           <TipGrid tips={cameraTips} />
         </section>
 
-        <section>
+        <section className="print:!mt-0 print:break-before-page">
           <SectionLabel index="07">On set</SectionLabel>
           <h2 className="font-display text-3xl leading-none font-thin uppercase md:text-5xl">Production and VFX</h2>
           <TipGrid tips={setTips} />

components/previz/ShotList.tsx

@@ -39,7 +39,7 @@ export default function ShotList({ shots, storeKey }: { shots: Shot[]; storeKey:
           <button
             type="button"
             onClick={() => setDone([])}
-            className="-my-2 py-2 font-mono text-[11px] tracking-[0.2em] text-muted uppercase hover:text-fg"
+            className="-my-2 py-2 font-mono text-[11px] tracking-[0.2em] text-muted uppercase hover:text-fg print:hidden"
           >
             Clear ticks
           </button>
@@ -78,7 +78,7 @@ export default function ShotList({ shots, storeKey }: { shots: Shot[]; storeKey:
           );
         })}
       </ul>
-      <p className="mt-3 text-xs text-muted">Ticks are saved on this device only.</p>
+      <p className="mt-3 text-xs text-muted print:hidden">Ticks are saved on this device only.</p>
     </div>
   );
 }

docker-compose.yml

@@ -5,6 +5,10 @@ services:
 
     restart: unless-stopped
 
+    # Login for /previz/ (gitignored; created once on the server, see DEPLOY.md)
+    volumes:
+      - ./docker/auth:/etc/nginx/auth:ro
+
     networks:
       - npm_default
 

docker/nginx.conf

@@ -23,6 +23,16 @@ server {
         add_header Cache-Control "public, max-age=604800";
     }
 
+    # Client previz pages: password protected (file lives on the server, see DEPLOY.md).
+    # ^~ beats the media regex above, so nothing in here gets a public cache header
+    # and Cloudflare never serves it to someone who hasn't logged in.
+    location ^~ /previz/ {
+        auth_basic "Two Tales VFX previz";
+        auth_basic_user_file /etc/nginx/auth/previz.htpasswd;
+        add_header Cache-Control "private, no-store";
+        try_files $uri $uri/ $uri.html =404;
+    }
+
     # Offline worker for /set must always be revalidated so updates roll out
     location = /set/sw.js {
         add_header Cache-Control "no-cache";

package.json

@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "previz:pdf": "next build && node scripts/previz-pdf.mjs crowd"
   },
   "dependencies": {
     "next": "16.3.8",

scripts/previz-pdf.mjs

@@ -0,0 +1,103 @@
+// Prints a /previz page from the static export to a PDF next to its assets.
+//   npm run build && node scripts/previz-pdf.mjs crowd
+// Drives Edge/Chrome over the DevTools protocol instead of --print-to-pdf: Chrome sizes the
+// print layout from the paper it is given, not from CSS @page, so the paper (A4 landscape)
+// has to be passed here for the desktop layout to kick in.
+import { spawn } from "node:child_process";
+import { createReadStream, existsSync, mkdtempSync, statSync, writeFileSync } from "node:fs";
+import { createServer } from "node:http";
+import { tmpdir } from "node:os";
+import { extname, join, resolve } from "node:path";
+
+const slug = process.argv[2] ?? "crowd";
+const out = resolve("out");
+const dest = resolve("public/previz", slug, `${slug}-previz.pdf`);
+
+const browser =
+  process.env.CHROME ??
+  [
+    "C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe",
+    "C:/Program Files/Google/Chrome/Application/chrome.exe",
+    "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
+    "/usr/bin/google-chrome",
+  ].find(existsSync);
+if (!browser) throw new Error("No Chrome/Edge found; set CHROME=/path/to/browser");
+if (!existsSync(join(out, "previz", slug, "index.html"))) throw new Error("Run `npm run build` first");
+
+const types = { ".html": "text/html", ".css": "text/css", ".js": "text/javascript", ".jpg": "image/jpeg", ".png": "image/png", ".svg": "image/svg+xml", ".mp4": "video/mp4", ".woff2": "font/woff2", ".txt": "text/plain" };
+const server = createServer((req, res) => {
+  let file = join(out, decodeURIComponent(new URL(req.url, "http://x").pathname));
+  if (existsSync(file) && statSync(file).isDirectory()) file = join(file, "index.html");
+  if (!file.startsWith(out) || !existsSync(file)) return res.writeHead(404).end();
+  res.writeHead(200, { "Content-Type": types[extname(file)] ?? "application/octet-stream" });
+  createReadStream(file).pipe(res);
+}).listen(0);
+const port = server.address().port;
+
+const proc = spawn(browser, [
+  "--headless=new",
+  "--disable-gpu",
+  "--remote-debugging-port=0",
+  `--user-data-dir=${mkdtempSync(join(tmpdir(), "previz-pdf-"))}`,
+  "about:blank",
+]);
+const wsUrl = await new Promise((ok, fail) => {
+  let buf = "";
+  proc.stderr.on("data", (d) => {
+    buf += d;
+    const m = buf.match(/DevTools listening on (ws:\/\/\S+)/);
+    if (m) ok(m[1]);
+  });
+  proc.on("exit", () => fail(new Error("Browser exited early")));
+});
+
+// Attach to the blank tab and talk to it
+const targets = await (await fetch(wsUrl.replace("ws://", "http://").replace(/\/devtools\/browser\/.*/, "/json"))).json();
+const ws = new WebSocket(targets.find((t) => t.type === "page").webSocketDebuggerUrl);
+await new Promise((ok) => ws.addEventListener("open", ok, { once: true }));
+let id = 0;
+const pending = new Map();
+const events = [];
+ws.addEventListener("message", ({ data }) => {
+  const msg = JSON.parse(data);
+  if (msg.id && pending.has(msg.id)) {
+    const { ok, fail } = pending.get(msg.id);
+    pending.delete(msg.id);
+    if (msg.error) fail(new Error(msg.error.message));
+    else ok(msg.result);
+  } else if (msg.method) events.push(msg.method);
+});
+const send = (method, params = {}) =>
+  new Promise((ok, fail) => {
+    pending.set(++id, { ok, fail });
+    ws.send(JSON.stringify({ id, method, params }));
+  });
+
+try {
+  await send("Page.enable");
+  await send("Page.navigate", { url: `http://localhost:${port}/previz/${slug}/` });
+  while (!events.includes("Page.loadEventFired")) await new Promise((r) => setTimeout(r, 100));
+  // Lazy images and fonts: load everything, then give layout a beat
+  await send("Runtime.evaluate", {
+    expression: `Promise.all([document.fonts.ready, ...[...document.images].map(i => (i.loading = "eager", i.decode().catch(() => {})))])`,
+    awaitPromise: true,
+  });
+  await new Promise((r) => setTimeout(r, 500));
+  const { data } = await send("Page.printToPDF", {
+    landscape: true,
+    paperWidth: 8.27, // A4, inches (landscape swaps them)
+    paperHeight: 11.69,
+    marginTop: 0,
+    marginBottom: 0,
+    marginLeft: 0,
+    marginRight: 0,
+    printBackground: true,
+    scale: 0.68, // lays out ~1650px wide: each section fits a page
+  });
+  writeFileSync(dest, Buffer.from(data, "base64"));
+  console.log(`Wrote ${dest} (${Math.round(Buffer.byteLength(data, "base64") / 1024)} KB)`);
+} finally {
+  ws.close();
+  proc.kill();
+  server.close();
+}