funman300
89da7b7609
Three things: the envelope rule was wrong and is corrected, /hub is settled, and two
documented response shapes that would freeze the client are fixed.
THE CORRECTION. The previous commit concluded that a three-token root consumes `{`, the
first field name and that field's value without dispatching them, so the first key of a
flat body was silently eaten, and that `login` had therefore never been delivered on
POST /user. That is WRONG and is withdrawn, along with the claim that the key order of
the auth dict is load-bearing.
The first call to FUN_1801c7f10 returns token 7 and consumes NO input. It is a
once-only start-of-document token, guarded by the flag at parser+0xda together with the
zero character counter at parser+0x30. So the three tokens are BOF, `{`, and the FIRST
FIELD NAME, and the key loop dispatches from that first key onward. The `== 10` test on
the third token is not an envelope check, it is the empty-object early-out: for `{}` the
third token is END_OBJECT and the root exits with its constructor defaults intact, which
is why answering `{}` has always been safe.
Corrected enum: 7=BOF 9=START_OBJECT 10=END_OBJECT 11=FIELD_NAME 12=START_ARRAY
13=END_ARRAY. The enum itself was right before; the inference from it was not.
HOW IT WAS CAUGHT, which is the part worth keeping. Not by more decompiling. /hub is
served flat and the wrong model predicted its first key would be discarded, so the
prediction was checked against the client's own memory: clubPlayers read back as 205,
the value the server sent, at model+0x1fd70+0x3c with the slide proven against the FNV
prologue first. One live read refuted a chain of otherwise sound static reasoning in
about a minute. tools/hub_counter_probe.py keeps it repeatable.
Consequence worth flagging: a wrapper is not just unnecessary for these roots, it would
be harmful, since a wrapper key hashes to an atom with no arm and the whole object is
skipped. That makes the createPackResponse envelope DOUBTFUL rather than confirmed.
Atom 0xbe has no arm in FUN_180162880. There is no live evidence either way because
nothing has ever parsed that body, so the buy path is left exactly as it is.
TWO ERRORS OF MINE ON THE WAY, both recorded in the doc because both are cheap to
repeat. I searched for RS4:FutGetHubServerResponse, found nothing and reported that no
hub class existed; the class is FutGetHubDataServerResponse (literal 0x18022ce40,
vtable 0x18022cd48, deser 0x1801738b0, control FutSquadSave -> 0x180171a60 matched in
the same run). Then I scanned 152 deserializers for clubPlayers, got zero hits and a
passing control, because the guard is `!= 0x90` and my pattern only matched `== 0x`.
The control passed only because auctionCount happens to use `==`. A control that does
not exercise the same code shape as the target is not a control. The comment already at
utas_server.py:1076 had the hub chain right the whole time.
ENDPOINT_MAP corrections, both freeze-risky as written, neither affecting what we serve
today:
* duplicateItemIdList is an ARRAY OF OBJECTS (element deser 0x180138e10), not the int
list at :1095. Bare ints where the element parser expects objects is a tokenizer
desync, i.e. a hard freeze at 0x1801c7f1a. Control that this is not a misread:
dreamSquads 0xe9 in FutMoveCard genuinely is a bare int array.
* FutDiscardCardServerResponse is {"items":[{"id":N}],"totalCredits":N}. There is no
top-level id.
No behaviour change. utas_server.py is comment-only. 439 contract checks pass.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
OpenFUT
Offline Ultimate Team — like SPT, but for FIFA 23.
OpenFUT replaces EA's retired FUT servers with a fully offline, single-player backend. You own FIFA 23 legitimately. You just want to keep playing after EA shut down the servers.
Repositories
| Repo | Purpose |
|---|---|
openfut-core |
Game-independent offline FUT backend |
openfut-bridge |
FIFA 23 integration layer + reverse-engineering proxy |
Architecture
FIFA 23 client
│
▼
┌─────────────────┐
│ openfut-bridge │ ← intercepts FUT traffic, maps routes, logs unknown
└────────┬────────┘
│
▼
┌─────────────────┐
│ openfut-core │ ← offline FUT backend: profiles, packs, squads, SBCs
└─────────────────┘
│
▼
SQLite database
Core is game-independent. It speaks a clean REST API and knows nothing about FIFA 23 internals.
Bridge is FIFA-specific. It speaks FIFA 23's wire protocol and translates it into Core API calls. Bridge is where all reverse engineering work happens.
Current Status
| Feature | Status |
|---|---|
| Local profiles + clubs | ✅ Working |
| Coin system | ✅ Working |
| Pack generator | ✅ Working |
| Card collection | ✅ Working |
| Squad builder | ✅ Working |
| Objectives engine | ✅ Working |
| SBC engine | ✅ Working |
| Match rewards | ✅ Working |
| NPC transfer market | ✅ Working |
| Statistics | ✅ Working |
| FIFA 23 integration | 🔴 Reverse engineering in progress |
| Chemistry calculation | 🟡 In progress |
| Full Draft mode | 🟡 In progress |
| Squad Battles AI generator | 🟡 In progress |
| Objectives claim flow | 🟡 In progress |
Running
# Start the offline backend
cd openfut-core
cargo run
# Start the proxy (for traffic capture / FIFA integration)
cd openfut-bridge
cargo run
Core listens on http://127.0.0.1:8080 by default.
Bridge listens on http://127.0.0.1:8443 by default.
Design Principles
- Offline-first. No EA account required. No internet connection needed.
- Single-player only. This is not a multiplayer server emulator.
- Data-driven. All cards, packs, SBCs, and objectives are JSON files. Everything is moddable.
- Clean architecture. Core has zero knowledge of FIFA 23. Bridge has zero game logic.
- No copyrighted assets. No real player images, no EA trademarks in data files.
Disclaimer
This project is not affiliated with EA Sports. You must own FIFA 23 legitimately to use this software. This project does not bypass any ownership verification and is intended only to restore offline playability of a game whose online services have been retired.