funman300 04c5043aba utas: My Squad filter corpus — every filter identified, root cause measured
Controlled retail capture, one criterion at a time, cleared between each.
47 transactions. Every filter the My Squad picker sends is now known from
the wire rather than guessed.

Route: GET /ut/game/fifa17/club -- the picker hits UTAS and reuses the
general club-inventory route.

  level=any|gold        quality      lowercase, ALWAYS present
  rare=SP               "Special"    uppercase, OMITTED when off
  position=ST           position     uppercase, omitted when off
  nation=52             entity id    numeric
  league=13             entity id    numeric
  team=5                entity id    numeric, NESTED under league
  sort=desc                          client constant; the UI has no sort control
  start=/count=11       pagination

Two encoding families: short string enums, and numeric FIFA ids. The ids
must never reach Core. Filters compose as plain ANDs in one query --
string and id filters alike -- so each maps independently.

THE ROOT CAUSE IS SELF-AMPLIFYING.

club_route honours type, team and league; it never reads start, count,
level, sort or year. Because start is ignored, every page returns the
same full set, so the client concludes the page was full and asks for the
next one. One scroll produced 22 requests and 6.2 MB, stopping at
start=200 only because the client gave up -- against a filtered set of 32
items that should have been three pages.

That also explains why the bug reads as erratic rather than broken:
league=13&position=ST returns every Premier League player instead of
Premier League strikers. Plausible, wrongly sized, hard to notice.

Measured filtered sets, from the real cluttered club -- these are the
acceptance test for the fix:

  unfiltered            1962
  league=13              350
  league=13&team=5        32

Two client behaviours worth carrying forward: the picker fires a query
per highlighted entry, not per selection (two requests for one club
pick), and parameter ORDER is not stable, so parsing must be key-value.

FIXTURE SIZE: bodies over 4 KB are truncated in the committed fixture,
with body_full_len and body_full_sha256 retained, because the same 1.1 MB
club response repeats ~25 times and its hash already proves identity.
13.3 MB -> 247 KB. The raw .ofcap keeps every byte, privately and
gitignored. Truncation is recorded per transaction so a trimmed fixture
is never mistaken for a whole response.

Audited across all three identifier surfaces -- headers, JSON bodies,
query strings -- before and after the size change: no leaks. 6/6
sanitiser mutations still killed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-11 19:32:57 +00:00

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.

S
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