fix: CustomVulnerabilityTemplate handles None purpose and special characters#216
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Fix three bugs in CustomVulnerabilityTemplate:
1. _apply_template_variables crashes with AttributeError when purpose
is None because it calls purpose.strip() unconditionally.
2. _apply_template_variables substitutes {purpose} before str.format(),
so if purpose contains curly braces (e.g. JSON descriptions), the
subsequent .format() call raises KeyError or ValueError. Now purpose
is passed through str.format() like the other variables.
3. _generate_fallback_prompt renders literal 'None' in the output when
purpose is not provided. Now defaults to 'general assistant'.
Add 17 focused tests for the template module covering placeholder
substitution, None/empty/whitespace purpose, special characters in
user-supplied values, literal braces preservation, and fallback prompt
generation.
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Summary
Fixes three bugs in
CustomVulnerabilityTemplatethat cause crashes or incorrect output when usingCustomVulnerability:Bug 1:
AttributeErrorwhenpurposeisNone_apply_template_variablescallspurpose.strip()unconditionally, raisingAttributeError: 'NoneType' object has no attribute 'strip'whenpurposeis omitted.Bug 2:
KeyError/ValueErrorwhenpurposecontains curly bracesThe old code substituted
{purpose}directly into the template string before callingstr.format(). If the purpose contained curly braces (e.g."JSON parser {key: value}"), the subsequent.format()call would misinterpret them as format placeholders and crash.Fix:
{purpose}is now passed throughstr.format()like the other variables (name,type,max_goldens), so special characters in user-supplied values are handled safely.Bug 3: Literal
Nonerendered in fallback prompt_generate_fallback_promptused an f-string with{purpose}, rendering the literal string"None"when purpose was not provided. Now defaults to"general assistant".Tests
Added 17 focused unit tests covering:
None, empty, and whitespace-only purpose handlingAll tests pass:
Related
Partially addresses the template-related crash path described in #154 (
TypeError: can only join an iterablewith custom vulnerability).