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feat(ugc): answer the client's UGC manifest requests without 3D services

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With UGCUSE3DSERVICES=7:0 (the client's default) the client asks its world for
a blueprint file's MD5 and size (REQUEST_UGC_MANIFEST_INFO, world 27) and then
downloads BrickModels/UserMade/<id % 1000>/<id>.<ext>.sd0. Layouts checked in
the 1.10.64 client: the request is a u64 blueprint id and a u8 resource type;
the answer (UGC_MANIFEST_RESPONSE, client 60) repeats them and adds a u8 valid,
the u32 size and the 16 byte MD5 of the inflated file, 37 bytes after the 0x53
exactly or the client drops it.

- dNet: WorldPackets::RequestUgcManifestInfo, ClientPackets::UgcManifestResponse
  (eUgcResourceType), with byte tests against the client's layouts.
- Database: ugc_file_checksums (per model or module combination and file) and
  ugc_modular_build.combination_id (migrations 89 / 72), GetUgcFileChecksum
  looks a blueprint up as a model, else as a build through its combination.
- UGC server: every download is also written as .sd0 (Sd0::Compress); workers
  hand the checksums back and the main thread stores them; old items get their
  sd0 icon and checksum, and builds their combination id, once at start-up, a
  few per tick; serves <dir>/BrickModels/UserMade/<bucket>/<id>.<ext>.sd0 under
  client_path, /<folder>/UserBrickModels and the root (.hkx 404).
- World: UgcManifest answers on the main thread with one indexed query per
  request; files not made yet are answered when they are (looked at again
  every 5 seconds), and a model in its quiet period is made right away. No
  worker threads, HTTP or file reads in the world.

Off by default (ugc_manifest=0): checked in game, the client then downloads
from http://127.0.0.1:80/lwoclient/UserBrickModels/ whatever its boot.cfg says
and logs the player out when it can't connect, so icons need the UGC server on
port 80 of each player's machine. docs/UgcServer.md has the details.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-27 17:46:47 -05:00
parent ceec638e52
commit 79235702b3
33 changed files with 706 additions and 14 deletions
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22
dUgcServer/UgcFormats.cpp
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@@ -372,4 +372,26 @@ namespace UgcFormats {
std::string ChecksumXml(std::string_view data) {
return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Checksum><MD5>" + Md5Hex(data) + "</MD5><Filesize>" + std::to_string(data.size()) + "</Filesize></Checksum>\n";
}
bool ReadChecksumXml(std::string_view xml, std::string& md5, uint32_t& size) {
const auto between = [xml](std::string_view open, std::string_view close) -> std::string_view {
const auto start = xml.find(open);
if (start == std::string_view::npos) return {};
const auto end = xml.find(close, start + open.size());
if (end == std::string_view::npos) return {};
return xml.substr(start + open.size(), end - start - open.size());
};
const auto hash = between("<MD5>", "</MD5>");
const auto length = between("<Filesize>", "</Filesize>");
if (hash.size() != 32 || length.empty()) return false;
uint64_t parsed = 0;
for (const char c : length) {
if (c < '0' || c > '9') return false;
parsed = parsed * 10 + static_cast<uint64_t>(c - '0');
if (parsed > std::numeric_limits<uint32_t>::max()) return false;
}
md5 = hash;
size = static_cast<uint32_t>(parsed);
return true;
}
}