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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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19
dNet/ClientPackets.cpp
View File

@@ -484,6 +484,25 @@ bool ClientPackets::BlueprintLoadItemResponse::Deserialize(RakNet::BitStream& bi
return true;
}
void ClientPackets::UgcManifestResponse::Serialize(RakNet::BitStream& bitStream) const {
bitStream.Write(blueprintId);
bitStream.Write(resourceType);
bitStream.Write<uint8_t>(valid ? 1 : 0);
bitStream.Write(fileSize);
for (const auto byte : md5) bitStream.Write(byte);
}
bool ClientPackets::UgcManifestResponse::Deserialize(RakNet::BitStream& bitStream) {
VALIDATE_READ(bitStream.Read(blueprintId));
VALIDATE_READ(bitStream.Read(resourceType));
uint8_t validByte{};
VALIDATE_READ(bitStream.Read(validByte));
valid = validByte != 0;
VALIDATE_READ(bitStream.Read(fileSize));
for (auto& byte : md5) VALIDATE_READ(bitStream.Read(byte));
return true;
}
namespace {
// A zone ID as three fields: map (u16), instance (u16), clone (u32)
void WriteZone(RakNet::BitStream& bitStream, const LWOZONEID& zoneID) {