feat(site): Downloads page and Quest install from the latest build

When the server is pointed at the bucket CI publishes builds to (DorkNet:Downloads:BaseUrl), the site lists them on a new Downloads page and the Quest page offers "Latest build" next to "Choose file". The server reads manifest.json and the files over HTTP on the internal network and streams them through with Range support (DownloadsController); only files the manifest lists are served. The xapk reader now reads from a byte source, either the picked File or the server URL via Range requests, so the browser installer streams the APK and OBB to the headset without downloading the package first. Unset, both features stay hidden.
2026-10-25 23:18:44 -07:00 · 2026-10-25 10:55:43 +02:00
parent 0839d932ce
commit cc7f77b7de
14 changed files with 646 additions and 36 deletions
@@ -0,0 +1,87 @@
+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";
+
+    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;
+        foreach (var release in releases.OfType<JsonObject>())
+        {
+            if (release["files"] is not JsonArray files) continue;
+            foreach (var file in files.OfType<JsonObject>())
+            {
+                if (string.Equals((string?)file["path"], path, StringComparison.Ordinal)) return file;
+            }
+        }
+        return null;
+    }
+
+    /// <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)));
+        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);
+        return await client.SendAsync(req, HttpCompletionOption.ResponseHeadersRead, ct);
+    }
+}