diff --git a/did_peer_4/__init__.py b/did_peer_4/__init__.py index 420b10d..b088462 100644 --- a/did_peer_4/__init__.py +++ b/did_peer_4/__init__.py @@ -4,6 +4,7 @@ from base58 import b58decode, b58encode from hashlib import sha256 +from .valid import validate_input_document # Regex patterns BASE58_ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" @@ -55,8 +56,11 @@ def _hash_encoded_doc(encoded_doc: str) -> str: def encode( document: Dict[str, Any], + validate: bool = True, ) -> str: """Encode an input document into a did:peer:4.""" + if validate: + document = dict(validate_input_document(document)) encoded_doc = _encode_doc(document) hashed = _hash_encoded_doc(encoded_doc) return f"did:peer:4{hashed}:{encoded_doc}" @@ -195,3 +199,14 @@ def resolve_short_from_doc( raise ValueError("Document does not match DID") return resolve_short(long) + + +__all__ = [ + "encode", + "encode_short", + "decode", + "resolve", + "resolve_short", + "resolve_short_from_doc", + "validate_input_document", +] diff --git a/did_peer_4/valid.py b/did_peer_4/valid.py new file mode 100644 index 0000000..01f486b --- /dev/null +++ b/did_peer_4/valid.py @@ -0,0 +1,76 @@ +"""Validate input documents.""" +from typing import Any, Mapping + + +def resources(document: Mapping[str, Any]): + """Yield all resources in a document, skipping references.""" + keys = ( + "verificationMethod", + "authentication", + "assertionMethod", + "keyAgreement", + "capabilityDelegation", + "capabilityInvocation", + "service", + ) + for key in keys: + if key in document: + if not isinstance(document[key], list): + raise ValueError(f"{key} must be a list") + + for index, resource in enumerate(document[key]): + if isinstance(resource, dict): + yield key, index, resource + + +def validate_input_document(document: Mapping[str, Any]) -> Mapping[str, Any]: + """Validate did:peer:4 input document. + + This validation is deliberately superficial. It is intended to catch mistakes + in the input document that would cause the peer DID to be invalid. It is not + intended to validate the contents of the document, which is left to the caller + after resolution. + + The following checks are performed: + + - The document must be a Mapping. + - The document must not be empty. + - The document must not contain an id. + - If present, alsoKnownAs must be a list. + - verificationMethod, authentication, assertionMethod, keyAgreement, + capabilityDelegation, capabilityInvocation, and service must be lists, if + present. + - All resources (verification methods, embedded verification methods, + services) must have an id. + - All resource ids must be strings. + - All resource ids must be relative. + - All resources must have a type. + """ + if not isinstance(document, Mapping): + raise ValueError("document must be a Mapping") + + if not document: + raise ValueError("document must not be empty") + + if "id" in document: + raise ValueError("id must not be present in input document") + + if "alsoKnownAs" in document: + if not isinstance(document["alsoKnownAs"], list): + raise ValueError("alsoKnownAs must be a list") + + for key, index, resource in resources(document): + if "id" not in resource: + raise ValueError(f"{key}[{index}]: resource must have an id") + + ident = resource["id"] + if not isinstance(ident, str): + raise ValueError(f"{key}[{index}]: resource id must be a string") + + if not ident.startswith("#"): + raise ValueError(f"{key}[{index}]: resource id must be relative") + + if "type" not in resource: + raise ValueError(f"{key}[{index}]: resource must have a type") + + return document diff --git a/pdm.lock b/pdm.lock index 0f6f809..d777a40 100644 --- a/pdm.lock +++ b/pdm.lock @@ -6,7 +6,7 @@ groups = ["default", "dev"] cross_platform = true static_urls = false lock_version = "4.3" -content_hash = "sha256:f2630d0ea89ee83519197b46b1cd363019d529b17b64f6425c48a8698de09214" +content_hash = "sha256:7c643a5b6447c95d53c76512366204499939a680a0dc286855adc438ecf68a4f" [[package]] name = "base58" @@ -85,6 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"pytest-cov>=4.1.0", ] + +[tool.coverage.report] +exclude_lines = [ + "pragma: no cover", + "@abstract" +] +precision = 2 +skip_covered = true +show_missing = true diff --git a/tests/__init__.py b/tests/__init__.py index e69de29..50cb5ab 100644 --- a/tests/__init__.py +++ b/tests/__init__.py @@ -0,0 +1,11 @@ +"""Tests for did:peer:4.""" +from pathlib import Path + + +def examples(): + """Load json from examples directory and return generator over examples.""" + examples_dir = Path(__file__).parent / "examples" + yield from examples_dir.glob("*.json") + + +EXAMPLES = list(examples()) diff --git a/tests/test_readme_examples.py b/tests/test_readme_examples.py index 57efaa4..5b8d731 100644 --- a/tests/test_readme_examples.py +++ b/tests/test_readme_examples.py @@ -1,17 +1,9 @@ import json import pytest -from pathlib import Path from did_peer_4 import encode, long_to_short, resolve, resolve_short - -def examples(): - """Load json from examples directory and return generator over examples.""" - examples_dir = Path(__file__).parent / "examples" - yield from examples_dir.glob("*.json") - - -EXAMPLES = list(examples()) +from . import EXAMPLES def print_example( diff --git a/tests/test_valid.py b/tests/test_valid.py new file mode 100644 index 0000000..8cbae3c --- /dev/null +++ b/tests/test_valid.py @@ -0,0 +1,50 @@ +from itertools import product +import json + +import pytest + +from did_peer_4 import validate_input_document + +from . import EXAMPLES + + +@pytest.mark.parametrize("example", EXAMPLES) +def test_validate_examples(example): + with open(example) as f: + example = json.load(f) + validate_input_document(example) + + +@pytest.mark.parametrize( + "invalid", + [ + 0, + {}, + {"id": "did:peer:4:123456789abcdefghi"}, + {"alsoKnownAs": "not a list"}, + *[ + {k: v} + for k, v in product( + [ + "verificationMethod", + "authentication", + "assertionMethod", + "keyAgreement", + "capabilityDelegation", + "capabilityInvocation", + "service", + ], + [ + "not a list", + [{}], + [{"id": "did:peer:4:123456789abcdefghi#key-1"}], + [{"id": "#key-1"}], + [{"id": 0}], + ], + ) + ], + ], +) +def test_invalid(invalid): + with pytest.raises(ValueError): + validate_input_document(invalid)