FEAT AzureContentFilterScorer: Switch to async client and accept async auth providers

[adrian-gavrila]

Description

Switches AzureContentFilterScorer from the synchronous ContentSafetyClient to the async version (azure.ai.contentsafety.aio), unblocking the event loop and accepting both sync and async token providers. This brings the scorer in line with PyRIT's async-first architecture and mirrors the pattern already used by OpenAIChatTarget.

Problem: The scorer used the synchronous ContentSafetyClient, blocking the event loop on every analyze_text() / analyze_image() call. It also explicitly rejected async token providers with a ValueError, forcing sync-only auth even though the rest of PyRIT works with async auth.

Changes (6 files, +149 / -61):

• pyrit/auth/azure_auth.py — New AsyncTokenProviderCredential class: wraps sync or async callables into an AsyncTokenCredential for the Azure SDK async client. Needed because unlike OpenAI's SDK (which accepts bare callables), the Azure SDK requires a credential object implementing the full AsyncTokenCredential protocol (get_token, close, __aenter__, __aexit__). Async counterpart to the existing TokenProviderCredential.
• pyrit/auth/__init__.py — Export AsyncTokenProviderCredential.
• pyrit/score/float_scale/azure_content_filter_scorer.py — Switched to async ContentSafetyClient. Added _ensure_async_token_provider() (same pattern as openai_target.py) to wrap sync callables at init time. api_key now accepts str | Callable[[], str | Awaitable[str]]. Default (no key) falls back to Entra ID via get_azure_async_token_provider(). Removed sync rejection guards.
• tests/unit/score/test_azure_content_filter.py — Updated mocks to AsyncMock, converted rejection tests to acceptance tests, added iscoroutinefunction assertions. 17/17 passing.
• tests/integration/score/test_azure_content_filter_integration.py — Removed AZURE_CONTENT_SAFETY_API_KEY gate; tests now use Entra ID auth by default, only requiring AZURE_CONTENT_SAFETY_API_ENDPOINT. 2/2 passing.
• tests/integration/mocks.py — Fixed pre-existing broken import (AttackIdentifier → ComponentIdentifier). This was blocking all 3 integration test files that import from this module.

Auth paths after this change:

api_key value	Behavior
None (no env var)	get_azure_async_token_provider() → async callable → AsyncTokenProviderCredential → async client
"my-api-key" (string)	AzureKeyCredential(key) → async client
Sync callable	_ensure_async_token_provider() wraps → AsyncTokenProviderCredential → async client
Async callable	Passes through → AsyncTokenProviderCredential → async client

Tests and Documentation

Unit tests (tests/unit/score/test_azure_content_filter.py): 17/17 passing. Updated 6 tests from MagicMock() to AsyncMock() for the now-async client methods. Converted 2 rejection tests into acceptance tests (async callables are now accepted, not rejected). Added inspect.iscoroutinefunction assertions to verify sync→async wrapping. Added pre-condition assertions on sync callable inputs.

Integration tests (tests/integration/score/test_azure_content_filter_integration.py): 2/2 passing. Tests now use Entra ID auth by default (the scorer's default when no API key is provided), requiring only AZURE_CONTENT_SAFETY_API_ENDPOINT and az login.

Pre-commit hooks: All passing for our code — ruff format, ruff check, mypy (421 source files checked, 0 errors in our files).

JupyText: Not applicable — no documentation notebooks were modified in this change.

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