sublimekeys 0.1.0

Official Python SDK for SublimeKeys — license activation and verification with offline-capable signed leases

sublimekeys

Official Python SDK for SublimeKeys — license key generation, activation, verification and trials for indie desktop apps, with offline-capable verification: once a license is activated, your app can verify it locally in milliseconds with no network call, for up to 7 days at a time, before quietly re-syncing online.

pip install sublimekeys

Quickstart

This mirrors the lifecycle described in the SublimeKeys docs: first run activates, every later run verifies (offline-first), uninstall deactivates.

from sublimekeys import SublimeKeysClient

client = SublimeKeysClient(product_id="my-app")

# First run — ask the user for their key once.
result = client.activate(license_key=user_entered_key)
if result.valid:
    unlock_full_version()

# Every later launch — offline-first, instant, falls back online
# automatically once the cached lease's 7-day trust window lapses.
result = client.verify(license_key=saved_key)
if result.valid:
    unlock_full_version()
print(result.source)  # "offline_cache" most days, "online" roughly weekly

# Uninstall / sign out.
client.deactivate(license_key=saved_key)

client.get_machine_id() gives you a stable, locally-persisted identifier if you need to store it yourself — every method above also generates and caches one automatically the first time it's needed, so passing it explicitly is optional.

Trials

result = client.start_trial()       # get-or-create a 7-day trial; idempotent —
                                     # reinstalling never resets the clock
if result.status == "active":
    print(f"{result.days_left} days left")

result = client.trial_status()      # read-only check, never starts one

How offline verification works

When activate() or verify() succeeds, the server returns a lease — a small Ed25519-signed token proving "this license is valid for this machine, as of now." The SDK caches it locally and, on every later verify() call, checks the signature against a pinned public key built into this package — no network call, no dependency on the server being reachable.

The lease itself expires after 7 days (server-controlled). Once it does, the next verify() call transparently goes online, gets a fresh lease, and the cycle repeats. This means a revoked or expired license can take up to 7 days to be caught while a machine stays fully offline — an intentional tradeoff for instant, network-independent checks the rest of the time, not a bug.

API

Method	What it does
activate(license_key, machine_id=None)	First run. Always online.
verify(license_key, machine_id=None, allow_offline=True)	Every later run. Offline-first by default.
deactivate(license_key, machine_id=None)	Uninstall/sign-out. Frees the seat, clears the local cache.
start_trial(machine_id=None)	Get-or-create a trial.
trial_status(machine_id=None)	Read-only trial check.
get_machine_id()	Stable per-install identifier (auto-generated, persisted locally).

All methods return a small dataclass (LicenseResult or TrialResult) — never raise for a normal "not valid" outcome. Network failures are caught internally too; verify() falls back to the offline cache or a valid=False, source="offline_cache_miss" result rather than raising.

Packaging with PyInstaller

cryptography's compiled backend is the kind of dependency that works fine under python app.py and only breaks in a frozen build. Before shipping:

• pyinstaller-hooks-contrib ships an official hook-cryptography and is usually auto-discovered. If you hit ModuleNotFoundError: _cffi_backend, add --collect-all cryptography (or --hidden-import=_cffi_backend) to your PyInstaller command.
• Test the frozen executable's activate()/verify() calls, not just the unfrozen dev script — this is the single highest-value check before shipping to real users.
• On macOS, notarizing a PyInstaller bundle that includes OpenSSL/rust-openssl dylibs is a known extra step — sign all bundled dylibs and test the signed, notarized build specifically.

See examples/pyinstaller/ for a minimal buildable example.

License

MIT