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Merge pull request #27 from FlavPMU/fix/support-errors-field
feat: add support for optional 'errors' field in MobileDocument
2 parents 25cf0b3 + 69d0b9a commit 2739897

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‎CHANGELOG.md‎

Whitespace-only changes.

‎docs/FIX_ERRORS_FIELD.md‎

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# Fix: Support for 'errors' field in MobileDocument
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## Problem
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ISO 18013-5 specifies that when a Device Response has `status != 0`, documents may contain an `errors` field describing which elements were not available or could not be returned.
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Example from real-world France Identité CNI:
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```python
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{
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'version': '1.0',
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'documents': [{
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'docType': 'eu.europa.ec.eudi.pid.1',
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'issuerSigned': {...},
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'errors': {
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'eu.europa.ec.eudi.pid.1': {
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'some_element': 1 # Error code
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}
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}
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}],
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'status': 20 # Elements not present
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}
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```
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Previously, pyMDOC-CBOR v1.0.1 would raise:
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```
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TypeError: MobileDocument.__init__() got an unexpected keyword argument 'errors'
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```
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## Solution
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Added support for the optional `errors` parameter in `MobileDocument.__init__()`:
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### Changes in `pymdoccbor/mdoc/verifier.py`
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1. **Updated `__init__` signature**:
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```python
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def __init__(self, docType: str, issuerSigned: dict, deviceSigned: dict = {}, errors: dict = None) -> None:
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# ...
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self.errors: dict = errors if errors is not None else {}
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```
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2. **Updated `dump()` method** to include errors when present:
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```python
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def dump(self) -> bytes:
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doc_dict = {
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'docType': self.doctype,
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'issuerSigned': self.issuersigned.dumps()
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}
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# Include errors field if present (ISO 18013-5 status != 0)
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if self.errors:
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doc_dict['errors'] = self.errors
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return cbor2.dumps(cbor2.CBORTag(24, value=doc_dict))
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```
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## Backward Compatibility
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✅ Fully backward compatible:
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- `errors` parameter is optional (defaults to `None`)
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- When `errors` is empty or `None`, it's not included in `dump()` output
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- All existing tests pass (36/36)
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## Tests
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Added comprehensive test suite in `pymdoccbor/tests/test_09_errors_field.py`:
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1. ✅ `test_mobile_document_with_errors_field` - Accepts errors field
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2. ✅ `test_mobile_document_without_errors_field` - Works without errors (backward compat)
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3. ✅ `test_mobile_document_dump_with_errors` - Includes errors in dump when present
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4. ✅ `test_mobile_document_dump_without_errors` - Excludes errors from dump when empty
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All tests pass: **36/36 passed**
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## Usage
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### With errors field (status != 0)
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```python
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from pymdoccbor.mdoc.verifier import MobileDocument
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document = {
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'docType': 'eu.europa.ec.eudi.pid.1',
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'issuerSigned': {...},
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'errors': {
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'eu.europa.ec.eudi.pid.1': {
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'missing_element': 1
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}
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}
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}
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doc = MobileDocument(**document) # ✅ Works now!
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print(doc.errors) # {'eu.europa.ec.eudi.pid.1': {'missing_element': 1}}
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```
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### Without errors field (status == 0)
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```python
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document = {
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'docType': 'eu.europa.ec.eudi.pid.1',
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'issuerSigned': {...}
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}
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doc = MobileDocument(**document) # ✅ Still works
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print(doc.errors) # {}
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```
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## ISO 18013-5 Reference
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From ISO/IEC 18013-5:2021, section 8.3.2.1.2.2:
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> **status**: Status code indicating the result of the request
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> - 0: OK
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> - 10: General error
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> - 20: CBOR decoding error
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> - ...
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>
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> When status != 0, the `errors` field MAY be present to provide details about which elements could not be returned.
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## Branch
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Branch: `fix/support-errors-field`

‎pymdoccbor/mdoc/verifier.py‎

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Original file line numberDiff line numberDiff line change
@@ -21,13 +21,14 @@ class MobileDocument:
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False: "failed",
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}
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def __init__(self, docType: str, issuerSigned: dict, deviceSigned: dict = {}) -> None:
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def __init__(self, docType: str, issuerSigned: dict, deviceSigned: dict = {}, errors: dict = None) -> None:
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"""
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Initialize the MobileDocument object
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:param docType: str: the document type
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:param issuerSigned: dict: the issuerSigned info
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:param deviceSigned: dict: the deviceSigned info
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:param errors: dict: optional errors field (ISO 18013-5 status != 0)
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"""
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if not docType:
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self.issuersigned: List[IssuerSigned] = IssuerSigned(**issuerSigned)
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self.is_valid = False
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self.devicesigned: dict = deviceSigned
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self.errors: dict = errors if errors is not None else {}
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def dump(self) -> dict:
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"""
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It returns the document as a dict
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:return: dict: the document as a dict
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"""
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return {
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'docType': self.doctype,
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'issuerSigned': self.issuersigned.dump()
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}
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def dumps(self) -> bytes:
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"""
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It returns the AF binary repr as bytes
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:return: dict: the document as bytes
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"""
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doc_dict = {
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'docType': self.doctype,
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'issuerSigned': self.issuersigned.dumps()
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}
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# Include errors field if present (ISO 18013-5 status != 0)
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if self.errors:
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doc_dict['errors'] = self.errors
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return cbor2.dumps(
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cbor2.CBORTag(
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24,
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value={
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'docType': self.doctype,
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'issuerSigned': self.issuersigned.dumps()
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}
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value=doc_dict
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)
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)
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claims_list = []
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for element in decoded['elementValue']:
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# Handle simple values in lists (strings, numbers, etc.)
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if not isinstance(element, dict):
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claims_list.append(element)
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continue
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# Handle dict elements
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claims_dict = {}
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for key, value in element.items():
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if isinstance(value, cbor2.CBORTag):

‎pymdoccbor/tests/test_09_errors_field.py‎

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"""
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Test support for the 'errors' field in MobileDocument.
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ISO 18013-5 specifies that when status != 0, documents may contain
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an 'errors' field describing which elements were not available.
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"""
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from pymdoccbor.mdoc.verifier import MobileDocument
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from pymdoccbor.mdoc.issuer import MdocCborIssuer
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from pymdoccbor.tests.micov_data import MICOV_DATA
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from pymdoccbor.tests.pkey import PKEY
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from pymdoccbor.tests.cert_data import CERT_DATA
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def test_mobile_document_with_errors_field():
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"""Test that MobileDocument accepts an 'errors' field."""
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mdoc = MdocCborIssuer(
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private_key=PKEY,
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alg="ES256",
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cert_info=CERT_DATA
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)
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mdoc.new(
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data=MICOV_DATA,
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doctype="org.micov.medical.1",
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validity={
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"issuance_date": "2024-12-31",
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"expiry_date": "2050-12-31"
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},
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)
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document = mdoc.signed["documents"][0]
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# Add errors field (simulating status 20 - elements not present)
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document['errors'] = {
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'org.micov.medical.1': {
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'missing_element': 1 # Error code for element not present
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}
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}
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# Should not raise TypeError
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doc = MobileDocument(**document)
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assert doc.doctype == "org.micov.medical.1"
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assert doc.errors is not None
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assert isinstance(doc.errors, dict)
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def test_mobile_document_without_errors_field():
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"""Test that MobileDocument works without 'errors' field (backward compatibility)."""
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mdoc = MdocCborIssuer(
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private_key=PKEY,
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alg="ES256",
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cert_info=CERT_DATA
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)
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mdoc.new(
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data=MICOV_DATA,
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doctype="org.micov.medical.1",
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validity={
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"issuance_date": "2024-12-31",
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"expiry_date": "2050-12-31"
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},
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)
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document = mdoc.signed["documents"][0]
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# No errors field
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doc = MobileDocument(**document)
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assert doc.doctype == "org.micov.medical.1"
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assert doc.errors == {} # Should default to empty dict
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def test_mobile_document_dump_with_errors():
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"""Test that dump() includes errors field when present."""
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mdoc = MdocCborIssuer(
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private_key=PKEY,
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alg="ES256",
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cert_info=CERT_DATA
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)
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mdoc.new(
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data=MICOV_DATA,
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doctype="org.micov.medical.1",
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validity={
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"issuance_date": "2024-12-31",
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"expiry_date": "2050-12-31"
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},
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)
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document = mdoc.signed["documents"][0]
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# Add errors field
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errors_data = {
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'org.micov.medical.1': {
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'missing_element': 1
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}
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}
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document['errors'] = errors_data
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doc = MobileDocument(**document)
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dump = doc.dump()
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assert dump
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assert isinstance(dump, bytes)
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# Decode and verify errors field is present
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import cbor2
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decoded = cbor2.loads(dump)
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# The dump is wrapped in a CBORTag, so we need to access .value
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if hasattr(decoded, 'value'):
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decoded = decoded.value
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assert 'errors' in decoded
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assert decoded['errors'] == errors_data
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def test_mobile_document_dump_without_errors():
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"""Test that dump() works without errors field (backward compatibility)."""
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mdoc = MdocCborIssuer(
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private_key=PKEY,
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alg="ES256",
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cert_info=CERT_DATA
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)
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mdoc.new(
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data=MICOV_DATA,
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doctype="org.micov.medical.1",
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validity={
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"issuance_date": "2024-12-31",
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"expiry_date": "2050-12-31"
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},
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)
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document = mdoc.signed["documents"][0]
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doc = MobileDocument(**document)
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dump = doc.dump()
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assert dump
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assert isinstance(dump, bytes)
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# Decode and verify errors field is NOT present
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import cbor2
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decoded = cbor2.loads(dump)
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if hasattr(decoded, 'value'):
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decoded = decoded.value
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# errors field should not be in dump if it's empty
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assert 'errors' not in decoded

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