fix: serve downloads only on the site host and select the clicked Quest build

Review follow-ups: - The downloads routes now answer only on the apex (the site's host) and 404 on every other accepted host, so the game's open API/CDN subdomains can't serve the builds. - Install on Quest passes its own file to the Quest page instead of always picking the newest release. - Waiting for the bucket's headers is limited to 30 s; the body still streams without a limit. - Dispose the upstream request message; use LINQ in FindFile.
feat(site): Downloads page and Quest install from the latest build
2026-10-25 23:18:44 -07:00 · 2026-10-25 11:06:43 +02:00 · 2026-10-25 10:55:43 +02:00
14 changed files with 689 additions and 36 deletions
@@ -0,0 +1,131 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Text.Json.Nodes;
+using DorkNet.Server.Controllers.Site;
+using DorkNet.Server.Services;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace DorkNet.Server.Tests;
+
+/// <summary>The site's downloads proxy: off without config, only on the site's
+/// own host, serves only files the manifest lists, and passes Range through so
+/// the browser Quest installer can read an .xapk in place.</summary>
+public sealed class DownloadsControllerTests
+{
+    private const string Apex = "dorknet.example.com";
+
+    private const string Manifest = """
+        {"releases":[{"id":"2023.03","title":"March 2023","files":[
+          {"id":"quest","platform":"quest","name":"DorkNet-2023.03-Quest.xapk","path":"2023.03/DorkNet-2023.03-Quest.xapk","size":10,"sha256":"x"}]}]}
+        """;
+
+    [Fact]
+    public async Task Without_a_base_url_the_manifest_is_404()
+    {
+        var (controller, _) = Create(baseUrl: null, _ => throw new InvalidOperationException("no request expected"));
+
+        Assert.IsType<NotFoundObjectResult>(await controller.GetManifest(CancellationToken.None));
+    }
+
+    [Theory]
+    [InlineData("api.dorknet.example.com")]
+    [InlineData("cdn.dorknet.example.com")]
+    public async Task Other_hosts_get_404_without_touching_the_bucket(string host)
+    {
+        var (controller, ctx) = Create("http://bucket.internal:3902", _ => throw new InvalidOperationException("no request expected"));
+        ctx.Request.Host = new HostString(host);
+
+        Assert.IsType<NotFoundObjectResult>(await controller.GetManifest(CancellationToken.None));
+        await controller.GetFile("2023.03/DorkNet-2023.03-Quest.xapk", CancellationToken.None);
+        Assert.Equal(StatusCodes.Status404NotFound, ctx.Response.StatusCode);
+    }
+
+    [Fact]
+    public void Only_listed_paths_are_found()
+    {
+        var manifest = (JsonObject)JsonNode.Parse(Manifest)!;
+
+        Assert.NotNull(DownloadsService.FindFile(manifest, "2023.03/DorkNet-2023.03-Quest.xapk"));
+        Assert.Null(DownloadsService.FindFile(manifest, "manifest.json"));
+        Assert.Null(DownloadsService.FindFile(manifest, "2023.03/../manifest.json"));
+    }
+
+    [Fact]
+    public async Task Unlisted_file_is_404_and_never_fetched()
+    {
+        var requested = new List<string>();
+        var (controller, ctx) = Create("http://bucket.internal:3902", req =>
+        {
+            requested.Add(req.RequestUri!.AbsolutePath);
+            return Json(Manifest);
+        });
+
+        await controller.GetFile("index.html", CancellationToken.None);
+
+        Assert.Equal(StatusCodes.Status404NotFound, ctx.Response.StatusCode);
+        Assert.Equal(["/manifest.json"], requested);
+    }
+
+    [Fact]
+    public async Task Range_is_forwarded_and_the_partial_response_streamed()
+    {
+        HttpRequestMessage? fileRequest = null;
+        var (controller, ctx) = Create("http://bucket.internal:3902/", req =>
+        {
+            if (req.RequestUri!.AbsolutePath == "/manifest.json") return Json(Manifest);
+            fileRequest = req;
+            var res = new HttpResponseMessage(HttpStatusCode.PartialContent) { Content = new ByteArrayContent("abcd"u8.ToArray()) };
+            res.Content.Headers.ContentRange = new ContentRangeHeaderValue(2, 5, 10);
+            return res;
+        }, host: "downloads.example.com");
+        ctx.Request.Headers.Range = "bytes=2-5";
+
+        await controller.GetFile("2023.03/DorkNet-2023.03-Quest.xapk", CancellationToken.None);
+
+        Assert.NotNull(fileRequest);
+        Assert.Equal("/2023.03/DorkNet-2023.03-Quest.xapk", fileRequest!.RequestUri!.AbsolutePath);
+        Assert.Equal("bytes=2-5", fileRequest.Headers.Range!.ToString());
+        Assert.Equal("downloads.example.com", fileRequest.Headers.Host);
+        Assert.Equal(StatusCodes.Status206PartialContent, ctx.Response.StatusCode);
+        Assert.Equal("bytes 2-5/10", ctx.Response.Headers.ContentRange.ToString());
+        Assert.Equal("bytes", ctx.Response.Headers.AcceptRanges.ToString());
+        Assert.Equal("abcd", Encoding.ASCII.GetString(((MemoryStream)ctx.Response.Body).ToArray()));
+    }
+
+    private static (DownloadsController, HttpContext) Create(
+        string? baseUrl, Func<HttpRequestMessage, HttpResponseMessage> handler, string? host = null)
+    {
+        var config = new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
+        {
+            ["DorkNet:Downloads:BaseUrl"] = baseUrl,
+            ["DorkNet:Downloads:Host"] = host,
+        }).Build();
+        var service = new DownloadsService(config, new StubFactory(handler), NullLogger<DownloadsService>.Instance);
+        var ctx = new DefaultHttpContext();
+        ctx.Request.Host = new HostString(Apex);
+        ctx.Response.Body = new MemoryStream();
+        var controller = new DownloadsController(service, new DomainConfig(Apex))
+        {
+            ControllerContext = new ControllerContext { HttpContext = ctx },
+        };
+        return (controller, ctx);
+    }
+
+    private static HttpResponseMessage Json(string body) =>
+        new(HttpStatusCode.OK) { Content = new StringContent(body, Encoding.UTF8, "application/json") };
+
+    private sealed class StubFactory(Func<HttpRequestMessage, HttpResponseMessage> handler) : IHttpClientFactory
+    {
+        public HttpClient CreateClient(string name) => new(new StubHandler(handler));
+    }
+
+    private sealed class StubHandler(Func<HttpRequestMessage, HttpResponseMessage> handler) : HttpMessageHandler
+    {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct)
+            => Task.FromResult(handler(request));
+    }
+}
@@ -0,0 +1,67 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using DorkNet.Server.Services;
+
+namespace DorkNet.Server.Controllers.Site;
+
+/// <summary>
+/// The client builds CI publishes, for the site's Downloads page and the
+/// Quest page's "latest build" install. Files are streamed from the downloads
+/// bucket (<see cref="DownloadsService"/>) with Range support, so the browser
+/// installer can read an .xapk's zip directory and entries without fetching
+/// the whole file. Only files the manifest lists are served.
+///
+/// The builds contain Rec Room's own game files, so the routes answer only on
+/// the site's own host (the apex) and 404 on every other host the server
+/// accepts: the game's API/CDN subdomains are typically left open for the
+/// client, while the site sits behind an access proxy (e.g. Cloudflare Access).
+/// </summary>
+[ApiController]
+[AllowAnonymous]
+[Route("api/site/v1/downloads")]
+public class DownloadsController(DownloadsService downloads, DomainConfig domain) : ControllerBase
+{
+    private bool Available => downloads.IsConfigured
+        && string.Equals(Request.Host.Host, domain.Apex, StringComparison.OrdinalIgnoreCase);
+
+    /// <summary>GET /api/site/v1/downloads — the manifest as published
+    /// (snake_case keys), or 404 when downloads aren't set up or the request
+    /// isn't for the site's host.</summary>
+    [HttpGet]
+    public async Task<IActionResult> GetManifest(CancellationToken ct)
+    {
+        if (!Available) return NotFound(new { error = "Downloads aren't set up on this server." });
+        var manifest = await downloads.GetManifestAsync(ct);
+        Response.Headers.CacheControl = "no-cache";
+        return Content((manifest ?? new System.Text.Json.Nodes.JsonObject { ["releases"] = new System.Text.Json.Nodes.JsonArray() })
+            .ToJsonString(), "application/json");
+    }
+
+    /// <summary>GET /api/site/v1/downloads/files/{path} — one listed file,
+    /// streamed; honours Range (206).</summary>
+    [HttpGet("files/{**path}")]
+    public async Task GetFile(string path, CancellationToken ct)
+    {
+        if (!Available) { Response.StatusCode = StatusCodes.Status404NotFound; return; }
+        var manifest = await downloads.GetManifestAsync(ct);
+        var entry = manifest is null ? null : DownloadsService.FindFile(manifest, path);
+        if (entry is null) { Response.StatusCode = StatusCodes.Status404NotFound; return; }
+
+        using var upstream = await downloads.GetFileAsync(path, Request.Headers.Range.ToString(), ct);
+        Response.StatusCode = (int)upstream.StatusCode;
+        if (!upstream.IsSuccessStatusCode) return;
+
+        var content = upstream.Content.Headers;
+        if (content.ContentLength is long length) Response.ContentLength = length;
+        if (content.ContentRange is not null) Response.Headers.ContentRange = content.ContentRange.ToString();
+        Response.Headers.AcceptRanges = "bytes";
+        if (upstream.Headers.ETag is not null) Response.Headers.ETag = upstream.Headers.ETag.ToString();
+        Response.Headers.CacheControl = "private, no-cache";
+        Response.ContentType = "application/octet-stream";
+        var name = (string?)entry["name"] ?? Path.GetFileName(path);
+        Response.Headers.ContentDisposition = new System.Net.Mime.ContentDisposition { FileName = name }.ToString();
+
+        await using var body = await upstream.Content.ReadAsStreamAsync(ct);
+        await body.CopyToAsync(Response.Body, 1 << 16, ct);
+    }
+}
@@ -0,0 +1,97 @@
+using System.Net.Http.Headers;
+using System.Text.Json.Nodes;
+
+namespace DorkNet.Server.Services;
+
+/// <summary>
+/// Reads the client builds CI publishes (<c>ci/downloads/publish.py</c>): a
+/// <c>manifest.json</c> plus the files it lists, in a bucket served over plain
+/// HTTP (e.g. Garage's web endpoint on the internal network). The site's
+/// Downloads and Quest pages fetch them through the server, so the bucket
+/// itself never has to be reachable from outside.
+///
+/// Configured with <c>DorkNet:Downloads:BaseUrl</c> (the folder holding
+/// <c>manifest.json</c>) and optionally <c>DorkNet:Downloads:Host</c> (the
+/// Host header to send, for web endpoints that pick the bucket by host name).
+/// Without a base URL <see cref="IsConfigured"/> is false and the site hides
+/// both features.
+/// </summary>
+public sealed class DownloadsService
+{
+    public const string HttpClientName = "downloads";
+
+    // How long the bucket may take to start answering. The body then streams
+    // with no limit (the client has none; the caller's abort token ends it).
+    private static readonly TimeSpan HeaderTimeout = TimeSpan.FromSeconds(30);
+
+    private readonly IHttpClientFactory _httpClientFactory;
+    private readonly Uri? _baseUri;
+    private readonly string? _host;
+
+    public DownloadsService(IConfiguration config, IHttpClientFactory httpClientFactory, ILogger<DownloadsService> log)
+    {
+        _httpClientFactory = httpClientFactory;
+        var baseUrl = config["DorkNet:Downloads:BaseUrl"]?.Trim();
+        if (!string.IsNullOrEmpty(baseUrl) && Uri.TryCreate(baseUrl.TrimEnd('/') + "/", UriKind.Absolute, out var uri)
+            && (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps))
+        {
+            _baseUri = uri;
+        }
+        var host = config["DorkNet:Downloads:Host"]?.Trim();
+        _host = string.IsNullOrEmpty(host) ? null : host;
+
+        if (_baseUri is null)
+            log.LogInformation("[downloads] no DorkNet:Downloads:BaseUrl; the Downloads page and Quest latest-build install are off");
+        else
+            log.LogInformation("[downloads] reading builds from {BaseUrl}{Host}", _baseUri, _host is null ? "" : $" (Host: {_host})");
+    }
+
+    public bool IsConfigured => _baseUri is not null;
+
+    /// <summary>The published manifest, or null when none has been published yet.</summary>
+    public async Task<JsonObject?> GetManifestAsync(CancellationToken ct)
+    {
+        using var res = await SendAsync("manifest.json", range: null, ct);
+        if (res.StatusCode == System.Net.HttpStatusCode.NotFound) return null;
+        res.EnsureSuccessStatusCode();
+        return JsonNode.Parse(await res.Content.ReadAsStringAsync(ct)) as JsonObject;
+    }
+
+    /// <summary>A manifest entry by its bucket path, or null when the manifest
+    /// doesn't list it. Only listed files are ever served.</summary>
+    public static JsonObject? FindFile(JsonObject manifest, string path)
+    {
+        if (manifest["releases"] is not JsonArray releases) return null;
+        return releases.OfType<JsonObject>()
+            .SelectMany(r => r["files"] is JsonArray files ? files.OfType<JsonObject>() : [])
+            .FirstOrDefault(f => string.Equals((string?)f["path"], path, StringComparison.Ordinal));
+    }
+
+    /// <summary>GET a file, forwarding the caller's Range header. The caller
+    /// owns the response and streams its content.</summary>
+    public Task<HttpResponseMessage> GetFileAsync(string path, string? range, CancellationToken ct)
+        => SendAsync(path, range, ct);
+
+    private async Task<HttpResponseMessage> SendAsync(string path, string? range, CancellationToken ct)
+    {
+        if (_baseUri is null) throw new InvalidOperationException("Downloads are not configured.");
+        var url = new Uri(_baseUri, string.Join('/', path.Split('/').Select(Uri.EscapeDataString)));
+        using var req = new HttpRequestMessage(HttpMethod.Get, url);
+        if (_host is not null) req.Headers.Host = _host;
+        if (!string.IsNullOrEmpty(range) && RangeHeaderValue.TryParse(range, out var r)) req.Headers.Range = r;
+        var client = _httpClientFactory.CreateClient(HttpClientName);
+        // The timeout covers only getting the headers: with ResponseHeadersRead
+        // the token is released once they arrive, and disposing the source
+        // here stops its timer before the body is streamed.
+        using var headers = CancellationTokenSource.CreateLinkedTokenSource(ct);
+        headers.CancelAfter(HeaderTimeout);
+        try
+        {
+            return await client.SendAsync(req, HttpCompletionOption.ResponseHeadersRead, headers.Token);
+        }
+        catch (OperationCanceledException) when (!ct.IsCancellationRequested)
+        {
+            throw new TimeoutException($"The downloads bucket didn't answer within {HeaderTimeout.TotalSeconds:0} s.");
+        }
+    }
+}
@@ -238,6 +238,9 @@ public static class RequestTracingExtensions
            return false;

        var path = request.Path.Value ?? "";
+        // Client builds are streamed through (several GB): never buffer them.
+        if (path.StartsWith("/api/site/v1/downloads/files/", StringComparison.OrdinalIgnoreCase))
+            return false;
        var ext = Path.GetExtension(path);
        if (string.IsNullOrEmpty(ext))
            return true;
@@ -217,6 +217,13 @@ public static class ServiceCollectionExtensions
        // so a deployment with no GitHub credentials behaves normally.
        services.AddSingleton<IGitHubIssues, GitHubIssueService>();
        services.AddHostedService<TestCaseIssueReconciler>();
+        // CI-published client builds for the site's Downloads / Quest pages.
+        // Off (IsConfigured=false) without DorkNet:Downloads:BaseUrl. No client
+        // timeout: a multi-GB file streams for longer than the default 100 s.
+        // DownloadsService limits the wait for headers itself, and the
+        // request's own abort token ends the stream.
+        services.AddHttpClient(DownloadsService.HttpClientName, c => c.Timeout = Timeout.InfiniteTimeSpan);
+        services.AddSingleton<DownloadsService>();
        // Scoped (per-request) — these services hold DbContext references and
        // must share the request's scope to participate in the request's
        // transaction lifecycle. Pre-PR-3 they were Singleton with in-process
@@ -8,6 +8,7 @@ import { Players } from './pages/Players';
 import { PlayerProfile } from './pages/PlayerProfile';
 import { Rooms } from './pages/Rooms';
 import { Join } from './pages/Join';
+import { Downloads } from './pages/Downloads';
 import { NotFound } from './pages/NotFound';

 // The Quest installer pulls in the WebUSB/ADB stack; load it only on /quest.
@@ -27,6 +28,7 @@ export function App() {
          <Route path="/rooms" element={<Rooms />} />
          <Route path="/join" element={<Join />} />
          <Route path="/quest" element={<Suspense fallback={null}><Quest /></Suspense>} />
+          <Route path="/downloads" element={<Downloads />} />
          {/* Legacy paths from the vanilla-JS feed.localhost site */}
          <Route path="/p/:id" element={<RedirectPhoto />} />
          <Route path="/u/:id" element={<RedirectPlayer />} />
@@ -1,6 +1,7 @@
 import { NavLink, Link, useLocation, useNavigate } from 'react-router';
 import { useEffect, useRef, useState } from 'react';
 import { BrandMark } from './BrandMark';
+import { getDownloads } from '../lib/downloads';

 const NAV = [
  { to: '/', label: 'Home', exact: true },
@@ -10,6 +11,8 @@ const NAV = [
  { to: '/join', label: 'Join' },
  { to: '/quest', label: 'Quest' },
 ];
+// Shown only when the server offers downloads (DorkNet:Downloads:BaseUrl).
+const DOWNLOADS = { to: '/downloads', label: 'Downloads', exact: false };

 export function Header() {
  const [open, setOpen] = useState(false);
@@ -17,6 +20,12 @@ export function Header() {
  const nav = useNavigate();
  const loc = useLocation();
  const inputRef = useRef<HTMLInputElement>(null);
+  const [hasDownloads, setHasDownloads] = useState(false);
+  const navItems = hasDownloads ? [...NAV, DOWNLOADS] : NAV;
+
+  useEffect(() => {
+    getDownloads().then((m) => setHasDownloads(m !== null)).catch(() => {});
+  }, []);

  // Close the mobile drawer on route change so tapping a nav item
  // doesn't leave a half-open overlay covering the page.
@@ -37,7 +46,7 @@ export function Header() {
        </Link>

        <nav className="hidden md:flex items-center gap-1 ml-2">
-          {NAV.map(n => (
+          {navItems.map(n => (
            <NavLink
              key={n.to}
              to={n.to}
@@ -85,7 +94,7 @@ export function Header() {
              />
            </form>
            <nav className="flex flex-col gap-1">
-              {NAV.map(n => (
+              {navItems.map(n => (
                <NavLink
                  key={n.to}
                  to={n.to}
@@ -0,0 +1,59 @@
+// The client builds CI publishes (ci/downloads/publish.py), served through
+// the server's DownloadsController. The manifest keeps the snake_case keys
+// publish.py writes.
+import { ApiError, get } from './api';
+
+export interface DownloadFile {
+  id: string; // pc-full | pc-patch | quest | quest-installer
+  platform: 'pc' | 'quest' | string;
+  name: string;
+  path: string;
+  size: number;
+  sha256: string;
+  build?: string;
+  commit?: string;
+  built_at?: string;
+}
+
+export interface DownloadRelease {
+  id: string;
+  title: string;
+  game_version?: string;
+  pc_exe?: string;
+  files: DownloadFile[];
+}
+
+export interface DownloadsManifest {
+  releases: DownloadRelease[];
+  updated?: string;
+}
+
+let cached: Promise<DownloadsManifest | null> | null = null;
+
+/** The manifest, or null when this server doesn't offer downloads. Fetched
+ * once per page load; pass `fresh` to re-read it. */
+export function getDownloads(fresh = false): Promise<DownloadsManifest | null> {
+  if (!cached || fresh) {
+    cached = get<DownloadsManifest>('/downloads').catch((e) => {
+      if (e instanceof ApiError && e.status === 404) return null;
+      cached = null;
+      throw e;
+    });
+  }
+  return cached;
+}
+
+export const fileUrl = (f: DownloadFile) =>
+  `/api/site/v1/downloads/files/${f.path.split('/').map(encodeURIComponent).join('/')}`;
+
+export interface QuestBuild { release: DownloadRelease; file: DownloadFile }
+
+/** A published Quest package: the one at `path` when given, otherwise the
+ * newest release's. Null when there's no match. */
+export function questBuild(m: DownloadsManifest | null, path?: string | null): QuestBuild | null {
+  for (const release of m?.releases ?? []) {
+    const file = release.files.find((f) => f.id === 'quest' && (!path || f.path === path));
+    if (file) return { release, file };
+  }
+  return null;
+}
@@ -95,7 +95,7 @@ export async function installXapk(
    let done = 0;
    const total = xapk.apk.size;
    onProgress({ phase: 'app', label: 'Installing the app', done, total });
-    const stream = counted(await entryStream(xapk.file, xapk.apk), (n) => {
+    const stream = counted(await entryStream(xapk.source, xapk.apk), (n) => {
      done += n;
      onProgress({ phase: 'app', label: 'Installing the app', done, total });
    });
@@ -124,7 +124,7 @@ export async function installXapk(

    let done = 0;
    onProgress({ phase: 'data', label: 'Copying game data', done, total });
-    const stream = counted(await entryStream(xapk.file, entry), (n) => {
+    const stream = counted(await entryStream(xapk.source, entry), (n) => {
      done += n;
      onProgress({ phase: 'data', label: 'Copying game data', done, total });
    });
@@ -1,9 +1,59 @@
-// Read a DorkNet .xapk (zip) straight from a File the player picked, without
-// loading it into memory. DorkNet.Quest/scripts/build.py stores the APK and
-// the OBB uncompressed, so those entries are plain byte ranges of the file and
-// stream out with Blob.slice(); manifest.json is deflated and goes through
+// Read a DorkNet .xapk (zip) without loading it into memory, either from a
+// File the player picked or from a URL that answers HTTP Range requests (the
+// server's latest published build). DorkNet.Quest/scripts/build.py stores the
+// APK and the OBB uncompressed, so those entries are plain byte ranges that
+// stream straight through; manifest.json is deflated and goes through
 // DecompressionStream. Handles zip64 so packages over 4 GB still open.

+/** Random access to the package's bytes; `end` is exclusive. */
+export interface ByteSource {
+  name: string;
+  size: number;
+  read(start: number, end: number): Promise<ArrayBuffer>;
+  stream(start: number, end: number): Promise<ReadableStream<Uint8Array<ArrayBuffer>>>;
+}
+
+export function fileSource(file: File): ByteSource {
+  return {
+    name: file.name,
+    size: file.size,
+    read: (start, end) => file.slice(start, end).arrayBuffer(),
+    stream: async (start, end) => file.slice(start, end).stream(),
+  };
+}
+
+/** A package on the server. `size` comes from the downloads manifest; every
+ * read is one Range request. */
+export function urlSource(url: string, name: string, size: number): ByteSource {
+  const get = async (start: number, end: number): Promise<Response> => {
+    let res: Response;
+    try {
+      res = await fetch(url, { headers: { Range: `bytes=${start}-${end - 1}` }, cache: 'no-store' });
+    } catch {
+      // A cross-origin redirect (an expired sign-in at an access proxy) also lands here.
+      throw new Error("Couldn't reach the server. Reload the page (you may need to sign in again) and try again.");
+    }
+    if (res.status !== 206) {
+      throw new Error(res.status === 200
+        ? "The server doesn't support partial downloads, so the package can't be read in place."
+        : `Downloading the package failed (HTTP ${res.status}).`);
+    }
+    return res;
+  };
+  const empty = () => new ReadableStream<Uint8Array<ArrayBuffer>>({ start: (c) => c.close() });
+  return {
+    name,
+    size,
+    read: async (start, end) => (end <= start ? new ArrayBuffer(0) : (await get(start, end)).arrayBuffer()),
+    stream: async (start, end) => {
+      if (end <= start) return empty();
+      const body = (await get(start, end)).body;
+      if (!body) throw new Error('The server sent an empty response.');
+      return body;
+    },
+  };
+}
+
 export interface XapkEntry {
  name: string;
  method: number; // 0 = stored, 8 = deflate
@@ -26,7 +76,7 @@ export interface XapkManifest {
 }

 export interface Xapk {
-  file: File;
+  source: ByteSource;
  manifest: XapkManifest;
  entries: Map<string, XapkEntry>;
  apk: XapkEntry;
@@ -39,18 +89,18 @@ const ZIP64_EOCD = 0x06064b50;
 const CENTRAL = 0x02014b50;
 const LOCAL = 0x04034b50;

-async function bytes(file: Blob, start: number, end: number): Promise<DataView> {
-  return new DataView(await file.slice(start, end).arrayBuffer());
+async function bytes(src: ByteSource, start: number, end: number): Promise<DataView> {
+  return new DataView(await src.read(start, end));
 }

 function u64(v: DataView, at: number): number {
  return Number(v.getBigUint64(at, true));
 }

-export async function openXapk(file: File): Promise<Xapk> {
+export async function openXapk(src: ByteSource): Promise<Xapk> {
  // End of central directory: last 22 bytes plus up to 64 KiB of comment.
-  const tailStart = Math.max(0, file.size - (22 + 0xffff + 20));
-  const tail = await bytes(file, tailStart, file.size);
+  const tailStart = Math.max(0, src.size - (22 + 0xffff + 20));
+  const tail = await bytes(src, tailStart, src.size);
  let eocd = -1;
  for (let i = tail.byteLength - 22; i >= 0; i--) {
    if (tail.getUint32(i, true) === EOCD) { eocd = i; break; }
@@ -65,14 +115,14 @@ export async function openXapk(file: File): Promise<Xapk> {
    const loc = eocd - 20;
    if (loc < 0 || tail.getUint32(loc, true) !== ZIP64_LOCATOR) throw new Error('Unsupported zip64 layout.');
    const z64At = u64(tail, loc + 8);
-    const z64 = await bytes(file, z64At, z64At + 56);
+    const z64 = await bytes(src, z64At, z64At + 56);
    if (z64.getUint32(0, true) !== ZIP64_EOCD) throw new Error('Unsupported zip64 layout.');
    count = u64(z64, 32);
    cdSize = u64(z64, 40);
    cdOffset = u64(z64, 48);
  }

-  const cd = await bytes(file, cdOffset, cdOffset + cdSize);
+  const cd = await bytes(src, cdOffset, cdOffset + cdSize);
  const entries = new Map<string, XapkEntry>();
  const decoder = new TextDecoder();
  let p = 0;
@@ -109,7 +159,7 @@ export async function openXapk(file: File): Promise<Xapk> {

  const manifestEntry = entries.get('manifest.json');
  if (!manifestEntry) throw new Error('Not an .xapk: manifest.json is missing.');
-  const manifest = JSON.parse(await new Response(await entryStream(file, manifestEntry)).text()) as XapkManifest;
+  const manifest = JSON.parse(await new Response(await entryStream(src, manifestEntry)).text()) as XapkManifest;
  if (!manifest.package_name) throw new Error('manifest.json has no package_name.');

  const apk = entries.get(`${manifest.package_name}.apk`)
@@ -122,15 +172,15 @@ export async function openXapk(file: File): Promise<Xapk> {
    return { entry, installPath: x.install_path };
  });

-  return { file, manifest, entries, apk, expansions };
+  return { source: src, manifest, entries, apk, expansions };
 }

 /** The entry's uncompressed bytes as a stream. */
-export async function entryStream(file: File, entry: XapkEntry): Promise<ReadableStream<Uint8Array>> {
-  const local = await bytes(file, entry.localHeaderOffset, entry.localHeaderOffset + 30);
+export async function entryStream(src: ByteSource, entry: XapkEntry): Promise<ReadableStream<Uint8Array<ArrayBuffer>>> {
+  const local = await bytes(src, entry.localHeaderOffset, entry.localHeaderOffset + 30);
  if (local.getUint32(0, true) !== LOCAL) throw new Error(`Corrupt entry ${entry.name}.`);
  const start = entry.localHeaderOffset + 30 + local.getUint16(26, true) + local.getUint16(28, true);
-  const raw = file.slice(start, start + entry.compressedSize).stream();
+  const raw = await src.stream(start, start + entry.compressedSize);
  if (entry.method === 0) return raw;
  if (entry.method === 8) return raw.pipeThrough(new DecompressionStream('deflate-raw'));
  throw new Error(`Unsupported compression in ${entry.name}.`);
@@ -0,0 +1,152 @@
+import { useEffect, useState } from 'react';
+import { Link } from 'react-router';
+import { fileUrl, getDownloads, type DownloadFile, type DownloadRelease, type DownloadsManifest } from '../lib/downloads';
+
+const fmtSize = (n: number) =>
+  n >= 2 ** 30 ? `${(n / 2 ** 30).toFixed(2)} GB` : n >= 2 ** 20 ? `${(n / 2 ** 20).toFixed(1)} MB` : `${Math.max(1, Math.round(n / 2 ** 10))} KB`;
+const fmtDate = (iso?: string) => {
+  if (!iso) return '';
+  const d = new Date(iso);
+  return Number.isNaN(+d) ? '' : d.toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' });
+};
+
+const PLATFORMS = [
+  { id: 'pc', title: 'PC', hint: 'Windows, with or without a VR headset.' },
+  { id: 'quest', title: 'Meta Quest', hint: 'Needs developer mode on your headset and a USB cable.' },
+];
+
+// What each file is for, in players' terms. Keyed by the ids publish.py writes.
+function describe(f: DownloadFile, rel: DownloadRelease): { title: string; primary?: boolean; body: React.ReactNode } {
+  switch (f.id) {
+    case 'pc-full':
+      return {
+        title: 'Full game', primary: true,
+        body: <>Rec Room {rel.title} with DorkNet already set up. Unzip it anywhere and
+          run {rel.pc_exe ? <code className="text-ink-200">{rel.pc_exe}</code> : 'the game'}.</>,
+      };
+    case 'pc-patch':
+      return {
+        title: 'Patch only',
+        body: <>Just the DorkNet part (MelonLoader and the DorkNet mod), for a copy of the game you already have. The
+          DorkNet launcher installs this for you; skip it if you got the full game.</>,
+      };
+    case 'quest':
+      return {
+        title: 'Quest app', primary: true,
+        body: <>Install it straight from this site: plug in your headset and use the <Link className="text-brand-300 hover:text-brand-200" to="/quest">Quest
+          page</Link> (Chrome or Edge). Or download it for SideQuest.</>,
+      };
+    case 'quest-installer':
+      return {
+        title: 'Install scripts',
+        body: <>Prefer the command line? Unzip these next to the Quest app and run <code className="text-ink-200">install.cmd</code> (Windows)
+          or <code className="text-ink-200">install.sh</code> (macOS / Linux). Needs adb.</>,
+      };
+    default:
+      return { title: f.name, body: null };
+  }
+}
+
+function FileCard({ f, rel }: { f: DownloadFile; rel: DownloadRelease }) {
+  const d = describe(f, rel);
+  const [copied, setCopied] = useState(false);
+  const copy = async () => {
+    try {
+      await navigator.clipboard.writeText(f.sha256);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
+    } catch { /* clipboard blocked: the full hash is in the tooltip */ }
+  };
+  return (
+    <article className={`card !p-5 flex flex-col gap-3 ${d.primary ? 'border-brand-500/50 ring-2 ring-brand-500/15' : ''}`}>
+      <div className="flex items-center gap-2">
+        <h3 className="font-semibold text-ink-50">{d.title}</h3>
+        {d.primary && <span className="badge bg-brand-500/15 text-brand-200">Start here</span>}
+      </div>
+      <p className="text-sm text-ink-300">{d.body}</p>
+      <div className="font-mono text-xs text-ink-400 break-all">{f.name}</div>
+      <div className="flex flex-wrap gap-x-3 gap-y-1 text-xs text-ink-400">
+        <span>{fmtSize(f.size)}</span>
+        {f.built_at && <span>Updated {fmtDate(f.built_at)}</span>}
+        {f.build && <span>Build {f.build}</span>}
+      </div>
+      <div className="mt-auto flex flex-wrap items-center gap-2 pt-1">
+        {f.id === 'quest' ? (
+          <>
+            <Link className="btn-primary" to={`/quest?file=${encodeURIComponent(f.path)}`}>Install on Quest</Link>
+            <a className="btn-secondary" href={fileUrl(f)} download={f.name}>Download</a>
+          </>
+        ) : (
+          <a className={d.primary ? 'btn-primary' : 'btn-secondary'} href={fileUrl(f)} download={f.name}>Download</a>
+        )}
+        <button
+          type="button"
+          onClick={copy}
+          title={`Copy SHA-256: ${f.sha256}`}
+          className={`rounded-md border border-dashed px-2 py-1 font-mono text-xs transition-colors ${
+            copied ? 'border-success text-success' : 'border-ink-700 text-ink-400 hover:text-ink-100'}`}
+        >
+          {copied ? 'Copied' : `SHA-256 ${f.sha256.slice(0, 12)}…`}
+        </button>
+      </div>
+    </article>
+  );
+}
+
+export function Downloads() {
+  const [m, setM] = useState<DownloadsManifest | null | undefined>(undefined);
+  const [err, setErr] = useState<string | null>(null);
+
+  useEffect(() => {
+    getDownloads(true).then(setM).catch((e) => setErr((e as Error).message));
+  }, []);
+
+  const releases = (m?.releases ?? []).filter((r) => r.files.length);
+
+  return (
+    <div className="max-w-4xl mx-auto space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold text-ink-50">Downloads</h1>
+        <p className="text-sm text-ink-400">
+          Rec Room for DorkNet, built from the DorkNet source by the build server. The SHA-256 next to each file
+          lets you check your download.
+        </p>
+      </div>
+
+      {err && <div className="rounded-lg border border-danger/30 bg-danger/5 px-4 py-3 text-sm text-danger">Couldn't load the builds: {err}</div>}
+      {m === undefined && !err && <p className="text-sm text-ink-400">Loading builds…</p>}
+      {m === null && <p className="text-sm text-ink-400">This server doesn't offer downloads.</p>}
+      {m && !releases.length && <p className="text-sm text-ink-400">No builds have been published yet.</p>}
+
+      {releases.map((rel) => (
+        <section key={rel.id} className="space-y-5">
+          <div className="flex flex-wrap items-baseline gap-x-3">
+            <h2 className="text-lg font-semibold text-ink-50">Rec Room {rel.title}</h2>
+            {rel.game_version && <span className="text-xs text-ink-400">Game build of {fmtDate(`${rel.game_version}T12:00:00Z`)}</span>}
+          </div>
+          {PLATFORMS.map((p) => {
+            const files = rel.files.filter((f) => f.platform === p.id);
+            if (!files.length) return null;
+            return (
+              <div key={p.id} className="space-y-2">
+                <div>
+                  <h3 className="label">{p.title}</h3>
+                  <p className="text-xs text-ink-400">{p.hint}</p>
+                </div>
+                <div className="grid gap-3 sm:grid-cols-2">
+                  {files.map((f) => <FileCard key={f.id} f={f} rel={rel} />)}
+                </div>
+              </div>
+            );
+          })}
+        </section>
+      ))}
+
+      {releases.length > 0 && (
+        <p className="border-t border-ink-800 pt-4 text-xs text-ink-400">
+          These builds contain Rec Room's own game files. They're for this community only: please don't re-share them.
+        </p>
+      )}
+    </div>
+  );
+}
@@ -1,6 +1,8 @@
-import { useRef, useState } from 'react';
-import { openXapk, type Xapk } from '../lib/xapk';
+import { useEffect, useRef, useState } from 'react';
+import { useSearchParams } from 'react-router';
+import { fileSource, openXapk, urlSource, type Xapk } from '../lib/xapk';
 import { connectHeadset, installXapk, webUsbSupported, type Headset, type Progress } from '../lib/questInstall';
+import { fileUrl, getDownloads, questBuild, type QuestBuild } from '../lib/downloads';

 const fmtSize = (n: number) =>
  n >= 1e9 ? `${(n / 1e9).toFixed(2)} GB` : n >= 1e6 ? `${(n / 1e6).toFixed(1)} MB` : `${Math.max(1, Math.round(n / 1e3))} KB`;
@@ -43,15 +45,36 @@ export function Quest() {
  const [err, setErr] = useState<string | null>(null);
  const [done, setDone] = useState(false);
  const fileRef = useRef<HTMLInputElement>(null);
+  // The server's latest published Quest build, if it offers downloads.
+  const [latest, setLatest] = useState<QuestBuild | null>(null);
+  const [params] = useSearchParams();

-  const pickFile = async (f: File | undefined) => {
-    if (!f) return;
+  const open = async (load: () => Promise<Xapk>) => {
    setErr(null); setDone(false); setProgress({}); setBusy('file');
-    try { setXapk(await openXapk(f)); }
+    try { setXapk(await load()); }
    catch (e) { setXapk(null); setErr((e as Error).message); }
    finally { setBusy(null); }
  };

+  const pickFile = async (f: File | undefined) => {
+    if (f) await open(() => openXapk(fileSource(f)));
+  };
+
+  const pickBuild = async (b: QuestBuild | null) => {
+    if (b) await open(() => openXapk(urlSource(fileUrl(b.file), b.file.name, b.file.size)));
+  };
+
+  useEffect(() => {
+    getDownloads().then((m) => {
+      setLatest(questBuild(m));
+      // Arriving from a Quest card's "Install on Quest" on the Downloads page:
+      // that card's own file, which may not be the newest release's.
+      const wanted = params.get('file');
+      if (wanted) void pickBuild(questBuild(m, wanted));
+    }).catch(() => { /* no downloads: only the file picker */ });
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
  const connect = async () => {
    setErr(null); setBusy('connect');
    try { setHeadset(await connectHeadset()); }
@@ -108,19 +131,32 @@ export function Quest() {
        </div>
      )}

-      <Step n={1} title="Choose the .xapk file" done={!!xapk}>
+      <Step n={1} title={latest ? 'Pick the build' : 'Choose the .xapk file'} done={!!xapk}>
+        {latest ? (
+          <p className="text-sm text-ink-400">
+            Install the latest build straight from this server: nothing to download first, it streams to the
+            headset during the install. Or pick a <code className="text-ink-200">.xapk</code> you already have.
+          </p>
+        ) : (
          <p className="text-sm text-ink-400">Pick the <code className="text-ink-200">DorkNet-….xapk</code> you were given. It stays on your computer; nothing is uploaded.</p>
+        )}
        <input ref={fileRef} type="file" accept=".xapk,.zip" className="hidden" onChange={(e) => pickFile(e.target.files?.[0])} />
        <div className="flex flex-wrap items-center gap-3">
-          <button className="btn-secondary" disabled={busy !== null} onClick={() => fileRef.current?.click()}>
-            {busy === 'file' ? 'Reading…' : xapk ? 'Choose a different file' : 'Choose file'}
+          {latest && (
+            <button className="btn-primary" disabled={busy !== null} onClick={() => pickBuild(latest)}>
+              {busy === 'file' ? 'Reading…' : `Latest build: ${latest.release.title}${latest.file.build ? ` (build ${latest.file.build})` : ''}`}
            </button>
-          {xapk && (
-            <span className="text-sm text-ink-300">
-              <span className="text-ink-100 font-medium">{name}</span> {xapk.manifest.version_name} · {fmtSize(totalSize)}
-            </span>
          )}
+          <button className="btn-secondary" disabled={busy !== null} onClick={() => fileRef.current?.click()}>
+            {busy === 'file' && !latest ? 'Reading…' : xapk && !latest ? 'Choose a different file' : 'Choose file'}
+          </button>
        </div>
+        {xapk && (
+          <p className="text-sm text-ink-300">
+            Selected: <span className="text-ink-100 font-medium">{name}</span> {xapk.manifest.version_name} · {fmtSize(totalSize)}
+            <span className="text-ink-500"> · {xapk.source.name}</span>
+          </p>
+        )}
      </Step>

      <Step n={2} title="Connect your headset" done={!!headset}>
@@ -412,6 +412,39 @@ for building and installing the patched APK.

 ---

+## Client downloads
+
+Optional. When CI publishes the client builds to a bucket
+(`ci/downloads/publish.py`, see `ci/jenkins/README.md`), the server can offer
+them on the public site:
+
+- a **Downloads** page (`/downloads`) listing every published file with its
+  size and SHA-256;
+- **Latest build** on the **Quest** page, which installs the newest Quest
+  package straight from the server: the browser reads it with HTTP Range
+  requests, so nothing is downloaded first.
+
+The server reads `manifest.json` and the files over plain HTTP, from inside
+your network, and streams them to the browser. Only files the manifest lists
+are served. The bucket itself never needs to be public.
+
+```env
+# Where manifest.json is: e.g. Garage's web endpoint on the internal network.
+DorkNet__Downloads__BaseUrl=http://garage-<service uuid>:3902
+# Optional Host header, for web endpoints that pick the bucket by host name
+# (Garage serves the bucket whose name matches it).
+DorkNet__Downloads__Host=<bucket name>
+```
+
+Unset, the site hides both features. The builds contain Rec Room's own game
+files: only turn this on when the site is behind an access proxy (e.g.
+Cloudflare Access) that admits just your community. The downloads routes
+answer only on the apex host, where the site lives, and return 404 on every
+other host the server accepts, so leaving the game's own subdomains open for
+the client doesn't expose the files. Put the apex behind the proxy.
+
+---
+
 ## Photon Cloud

 Use your own Photon AppIds. Rec Room's original Photon AppIds reject
@@ -85,6 +85,13 @@ pitfall in their Quest client notes.
   installer scripts; the app appears as **DorkNet** under Unknown Sources.
   Share the `.xapk` however you like: the page reads it from the player's own
   disk, so your server never hosts game files.
+5. Optionally, let players install the latest CI build without downloading it
+   first: point the server at the downloads bucket CI publishes to
+   (`DorkNet__Downloads__BaseUrl`, see `deploy.md` → Client downloads). The
+   Quest page then offers **Latest build** next to **Choose file** and streams
+   the package from the server during the install, and the site gets a
+   **Downloads** page. The builds contain game files, so only do this with
+   the site behind an access proxy.

 No server component is Quest-specific beyond the placeholder-platform-id
-handling above.
+handling above and the optional downloads proxy.