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MPT-25030 Raise a typed MPT error for any error response body - #423
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✅ Found Jira issue key in the title: MPT-25030 |
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🧰 Additional context used🧠 Learnings (1)📓 Common learnings📝 WalkthroughWalkthroughThe change restricts structured ChangesHTTP error handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Error responses using UTF-16 or UTF-32 JSON objects may be classified differently from the intended fallback behavior. This is a bounded error-handling compatibility concern that should be explicitly accepted or resolved before merging. 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Inline comments:
In `@mpt_api_client/exceptions.py`:
- Line 290: Update the response JSON parsing flow around response.json() to
decode response.content strictly as UTF-8 before parsing, so UTF-16 and UTF-32
payloads are rejected rather than converted into MPTAPIError. Add a regression
test covering a UTF-16 JSON response and preserve the existing valid UTF-8 error
handling behavior.
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tests/unit/test_exceptions.py
[warning] 151-151: Do not make http calls without encryption
Context: "http://test"
Note: [CWE-319] Cleartext Transmission of Sensitive Information.
(requests-http)
🔇 Additional comments (4)
tests/unit/conftest.py (1)
91-107: LGTM!tests/unit/http/mixins/test_streaming_mixin.py (2)
29-29: LGTM!
789-824: LGTM!docs/streaming.md (1)
557-560: LGTM!
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Inline comments:
In `@docs/architecture.md`:
- Line 280: Correct the RFC 8259 attribution in the paragraph containing the
UTF-8, UTF-16, and UTF-32 statement: remove the parenthetical or reframe it
explicitly as HTTPX compatibility behavior, while preserving the existing HTTPX
behavior and avoiding any claim that RFC 8259 permits UTF-16 or UTF-32
interchange encoding.
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Learnt from: jentyk
Repo: softwareone-platform/mpt-api-python-client PR: 423
File: mpt_api_client/exceptions.py:292-292
Timestamp: 2026-09-08T16:18:22.682Z
Learning: In `mpt_api_client/exceptions.py`, `transform_http_status_exception` intentionally uses HTTPX `Response.json()` so detected UTF-8, UTF-16, and UTF-32 JSON objects become `MPTAPIError` and retain structured fields such as `detail`, `title`, and `traceId`. Non-object JSON and bytes that HTTPX cannot decode become `MPTHttpError`, with the HTTP status code preserved. `tests/unit/test_exceptions.py::test_transform_detected_json_encoding` protects this behavior for UTF-16 and UTF-32.
🪛 ast-grep (0.45.2)
tests/unit/test_exceptions.py
[warning] 151-151: Do not make http calls without encryption
Context: "http://test"
Note: [CWE-319] Cleartext Transmission of Sensitive Information.
(requests-http)
🔇 Additional comments (2)
mpt_api_client/exceptions.py (1)
277-309: LGTM!tests/unit/test_exceptions.py (1)
7-7: LGTM!Also applies to: 149-190
transform_http_status_exception handed response.json() straight to
MPTAPIError, whose __init__ calls payload.get(...). An error body that is
valid JSON but not an object - a bare string, null, or an array - made
that call raise AttributeError, so the caller lost the HTTP status
entirely and could not branch on it. The payload: dict[str, str]
annotation confirms a non-dict was never intended. Returning
BadRequest("Invalid filter expression") is idiomatic ASP.NET Core and
serializes to a bare JSON string, so a hand-written collection action
answering 400 for invalid RQL reaches this shape without any
misconfiguration.
The streaming error mapping made it worse: raise_streaming_error picks
MPTStreamingNotSupportedError, MPTStreamingNotAcceptableError and
MPTStreamingOverCapError off the status of an MPTHttpError, so a bare
string body on 406 or 413 lost the typed streaming error and the
over-cap detail with it.
The same except clause also missed UnicodeDecodeError, which
response.json() raises for a body whose bytes do not decode - a
ValueError but not a JSONDecodeError - and the fallback
response.content.decode() would then have failed the same way.
Decode the body first, catch ValueError to cover both decode failures,
and build an MPTAPIError only when the payload really is a dict.
Everything else becomes an MPTHttpError carrying the raw body with
undecodable bytes replaced, which is right for a human-readable
diagnostic rather than record data. The status code now survives every
body shape.
Tests parametrize the error-body shapes - object, bare string, null,
array, non-JSON, empty, and an ISO-8859-1 body - over the paged path and
over 501, 406 and 413 on the sync and async streaming paths; the shared
cases live in tests/unit/conftest.py. A further case pins the UTF-16 and
UTF-32 objects that httpx's encoding detection parses, so the
documented rule matches what the code does. Document the selection rule
in docs/architecture.md and note in docs/streaming.md that the status,
not the body, decides the streaming error type.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@coderabbitai review The RFC 8259 attribution finding is addressed in 🤖 Generated by AI |
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🤖 AI-generated PR — Please review carefully.
Problem
transform_http_status_exceptionhandedresponse.json()straight toMPTAPIError, whose__init__callspayload.get(...). An error body that is valid JSON but not an object —a bare string,
null, or an array — made that call raiseAttributeError, so the caller lostthe HTTP status entirely and could not branch on it. The
payload: dict[str, str]annotationconfirms a non-dict was never intended.
return BadRequest("Invalid filter expression")is idiomatic ASP.NET Core and serializes to abare JSON string, so a hand-written collection action answering
400for invalid RQL reachesthis shape without any misconfiguration.
The streaming error mapping made it worse:
raise_streaming_errorpicksMPTStreamingNotSupportedError,MPTStreamingNotAcceptableErrorandMPTStreamingOverCapErroroff the status of anMPTHttpError, so a bare-string body on406or
413lost the typed streaming error — and the over-cap detail with it.The same
except json.JSONDecodeErrorclause also missedUnicodeDecodeError, whichresponse.json()raises for a body that is not valid UTF-8 (aValueError, but not aJSONDecodeError); the fallbackresponse.content.decode()would then have failed the sameway.
Reproduced before the fix, on both read paths:
"Invalid filter expression"AttributeErrorAttributeErrornullAttributeErrorAttributeError[{"code": "x"}]AttributeErrorAttributeErrorUnicodeDecodeErrorUnicodeDecodeError{"detail": "..."}MPTAPIError✅MPTStreamingOverCapError✅<html>Bad Gateway</html>MPTHttpError✅MPTStreamingOverCapError✅What changed
mpt_api_client/exceptions.py— decode the body first, catchValueErrorso bothJSONDecodeErrorandUnicodeDecodeErrorare covered, and build anMPTAPIErroronly whenthe payload really is a
dict. Everything else becomes anMPTHttpErrorcarrying the rawbody with undecodable bytes replaced, which is right for a human-readable diagnostic rather
than record data.
status_codenow survives every body shape.Tests
Parametrized error-body shapes — object, bare string,
null, array, non-JSON, empty, and anISO-8859-1 body with a non-breaking space — asserting a typed error and a preserved
status_code:tests/unit/test_exceptions.py, with an exact type check becauseMPTAPIErrorwould satisfy anisinstance(result, MPTHttpError)checktests/unit/http/mixins/test_streaming_mixin.py, across501,406and413on the sync reader plus413on the async readertests/unit/conftest.pyVerified the tests reproduce the defect: with the fix reverted, 21 of the new cases fail —
exactly the bare-string,
null, array and non-UTF-8 shapes — while the object, non-JSON andempty shapes pass either way.
Docs
docs/architecture.md— when an error becomesMPTAPIErrorversusMPTHttpErrordocs/streaming.md— the status, not the body, decides the streaming error typedocs/unit_tests.md—tests/unit/conftest.pynow also holds shared parametrize casesTesting
make check-allpasses:ruff format --check,ruff check,flake8,mypy,uv lock --check, and 2744 unit tests.mpt_api_client/exceptions.pyis at 100% statementand branch coverage.
Closes MPT-25030
MPTAPIError.MPTHttpErrorwhile preserving HTTP status codes.