allowly-receipt-format 2.1.0

Reference Python verifier for the Allowly Receipt Format

Python Reference Verifier

Packaged Python verifier for Allowly Receipt Format 2.0.0.

Install

pip install allowly-receipt-format

Only dependency: cryptography for Ed25519 signature verification.

CLI

Verify a single receipt:

allowly-receipt-verify path/to/receipt.json path/to/keys.json

Verify a whole export or audit-package chain in one go (.jsonl or .jsonl.gz):

# Each line is either a bare receipt (audit-package chain.jsonl) or a
# {"receipt_id", ..., "receipt": {...}} export wrapper — both are handled.
allowly-receipt-verify --export chain.jsonl keys.json

Verify only one authorization's chain and check its structure (exactly one authorization.create, at most one authorization.revoke, well-formed timestamps), printing the timeline:

allowly-receipt-verify --export export.jsonl.gz keys.json --authorization-id auth_01HXZ2...

For local development without installing from PyPI:

pip install -e .
python verifier.py path/to/receipt.json path/to/keys.json

Exit codes:

• 0 — all receipts valid (and, with --authorization-id, the chain is well-formed)
• 1 — any receipt invalid, no receipts matched, or a chain anomaly (reason on stderr)

Library

from allowly_receipt_format import verify_receipt, VerificationError, load_keys_from_json
import json

with open("receipt.json") as f:
    receipt = json.load(f)
with open("keys.json") as f:
    keys_doc = json.load(f)
keys = load_keys_from_json(keys_doc)

try:
    verify_receipt(receipt, keys, expected_workspace_id=keys_doc["workspace_id"])
    print("valid")
except VerificationError as e:
    print(f"invalid: {e}")

Always pass expected_workspace_id to bind the receipt to a workspace — a key_id alone does not (spec §7, "Workspace binding"). The allowly-receipt-verify CLI enforces this automatically using the key document's workspace_id:

verify_receipt(receipt, keys, expected_workspace_id="ws_01HXA1B2C3D4E5F6G7H8J9K0L1")

The package exposes typed verifier exceptions:

• SchemaError
• UnknownKeyError
• KeyOutsideActiveWindowError
• SignatureMismatchError

All inherit from VerificationError.

Match a keyed pseudonym reference

matches_ref implements the optional hmac-v1 convention in specification Appendix A. Decode the show-once integration key, then match locally:

import base64
from allowly_receipt_format import matches_ref

encoded_key = "<pseudonym_key_b64url>"
key = base64.urlsafe_b64decode(encoded_key + "=" * (-len(encoded_key) % 4))

assert matches_ref(
    key,
    "record",
    "MRN-48291",
    receipt["context"]["record_ref"],
)

Use the context.ref_key_version recorded in the receipt to select the retained key version. Matching occurs entirely offline; it does not ask Allowly to resolve an identifier.

verify_receipt accepts an already-parsed object. Python's normal JSON parser cannot report duplicate member names or preserve whether an integer was written as 1, 1.0, or 1e0; reject those forms at the raw-JSON boundary when the original receipt text is untrusted (spec §4.2).

Test vectors

Run against the shared test vectors:

pip install -e .
python test_vectors.py ../../test-vectors.json
python test_exception_types.py ../../test-vectors.json

All should_verify vectors must pass; all should_reject vectors must be rejected with the expected reason.

License

Apache 2.0.