fix(auth): handle missing APPDATA on Windows gracefully#13471
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westarle merged 3 commits intoJun 17, 2026
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This pull request addresses a potential NullPointerException on Windows when the APPDATA environment variable is missing by falling back to an empty string, and adds a test case for this scenario. However, the review feedback identifies a security vulnerability: falling back to an empty string causes the file path to resolve to the current working directory, which could lead to an untrusted search path exploit. The reviewer suggests returning null immediately if APPDATA is not set.
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Other languages (such as Python and Node.js) handle missing HOME or APPDATA directories by falling back gracefully or failing with a structured Error/Exception. This change brings Java into parity by ensuring an orderly IOException is explicitly thrown by getWellKnownCredentialsFile instead of triggering an opaque NullPointerException when APPDATA is null. Fixes googleapis#12565
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lqiu96
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Other languages (such as Python and Node.js) handle missing HOME or APPDATA directories by falling back gracefully or failing with a structured Error/Exception. This change brings Java into parity by ensuring an orderly IOException is thrown instead of an opaque NullPointerException when APPDATA is null.
Fixes #12565