JSON map and URL parameter builders fail for types with a version parameter

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評估

難度
3/5
預估耗時
半天
新手友好度
72/100
Issue 類型
缺陷
描述清晰度
描述清楚
活躍度
活躍
技術堆疊
java
領域
backend

研究方向

Start in core/src/main/java/com/backblaze/b2/json/B2JsonObjectHandler.java. Compare the array allocation at line 457 in the normal deserialize path, which uses constructorParamCount and fills the version parameter around lines 492-494, with the two allocations at lines 504 and 536 in deserializeFromFieldNameToValueMap and deserializeFromUrlParameterMap. Done when a test class annotated with versionParam can be built through both methods without an IllegalArgumentException, and the version value is set there too.

由索引模型根據 Issue 內容生成。

描述

What happens

For a type that declares a versionParam, the normal deserialize path sizes its constructor argument array with constructorParamCount (fields plus the version parameter). deserializeFromFieldNameToValueMap and deserializeFromUrlParameterMap size it with fields.length, so the array is one element short and constructor.newInstance throws an unchecked IllegalArgumentException (wrong number of arguments) that is not turned into a B2JsonException.

Where

core/src/main/java/com/backblaze/b2/json/B2JsonObjectHandler.java:504 and :536 (compare :457, and :235-236 where constructorParamCount is set); the version parameter is filled in at :492-494 only on the normal path.

Why it matters

Impact: Availability (building the object fails), loud. Severity: High, because it only affects types that use versionParam and are built from a map or URL parameters (unusual), and no type in the SDK's main code uses versionParam.

How to check

Found by reading the code, not reproduced. Read the three array allocations. A test could define a @B2Json.type(versionParam = "v") class and call deserializeFromFieldNameToValueMap or deserializeFromUrlParameterMap on it. Using constructorParamCount and setting the version parameter in those two methods would fix it.

Version

Seen at v6.5.0. Present on the default branch: present.

主要語言
Java
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103
分支
23
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