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fix(auth): handle null APPDATA environment variable in GoogleAuthUtils.getWellKnownCredentialsFile #12913

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fix(auth): handle null APPDATA environment variable in GoogleAuthUtils.getWellKnownCredentialsFile #12913

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cc39e0b
fix(auth): handle null APPDATA environment variable in GoogleAuthUtil…
anishesg Apr 24, 2026
a5ed240
address review feedback: extend APPDATA check to reject empty/blank s…
anishesg Apr 24, 2026
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11 changes: 10 additions & 1 deletion google-auth-library-java/oauth2_http/java/com/google/auth/oauth2/GoogleAuthUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,8 @@
package com.google.auth.oauth2;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.UncheckedIOException;

/**
* This public class provides shared utilities for common OAuth2 utils or ADC. It also exposes
Expand Down Expand Up @@ -70,7 +72,14 @@ static final File getWellKnownCredentialsFile(DefaultCredentialsProvider provide
if (envPath != null) {
cloudConfigPath = new File(envPath);
} else if (provider.getOsName().indexOf("windows") >= 0) {
File appDataPath = new File(provider.getEnv("APPDATA"));
String appDataEnv = provider.getEnv("APPDATA");
if (appDataEnv == null) {
throw new UncheckedIOException(
new FileNotFoundException(
"APPDATA environment variable is not set; cannot locate the well-known"
+ " credentials file on Windows."));
}
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@gemini-code-assist gemini-code-assist Bot Apr 24, 2026

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medium

While checking for null prevents a NullPointerException, an empty string for the APPDATA environment variable would also result in an invalid path. It is recommended to handle empty or blank strings as well to ensure the well-known credentials path is correctly resolved or fails with a descriptive error.

Suggested change
if (appDataEnv == null) {
throw new UncheckedIOException(
new FileNotFoundException(
"APPDATA environment variable is not set; cannot locate the well-known"
+ " credentials file on Windows."));
}
if (appDataEnv == null || appDataEnv.trim().isEmpty()) {
throw new UncheckedIOException(
new FileNotFoundException(
"APPDATA environment variable is not set or empty; cannot locate the well-known"
+ " credentials file on Windows."));
}

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@anishesg anishesg Apr 24, 2026

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Good catch — updated the check to appDataEnv == null || appDataEnv.trim().isEmpty() and adjusted the error message accordingly. Also added tests for the empty-string and blank-string cases.

File appDataPath = new File(appDataEnv);
cloudConfigPath = new File(appDataPath, provider.CLOUDSDK_CONFIG_DIRECTORY);
} else {
File configPath = new File(provider.getProperty("user.home", ""), ".config");
Expand Down
19 changes: 19 additions & 0 deletions ...e-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/GoogleAuthUtilsTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,12 +33,31 @@

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.UncheckedIOException;
import org.junit.jupiter.api.Test;

class GoogleAuthUtilsTest {

@Test
void getWellKnownCredentialsFile_windows_nullAppData_throwsUncheckedIOException() {
DefaultCredentialsProviderTest.TestDefaultCredentialsProvider provider =
new DefaultCredentialsProviderTest.TestDefaultCredentialsProvider();
provider.setProperty("os.name", "windows");
// APPDATA is intentionally not set, so getEnv("APPDATA") returns null

UncheckedIOException thrown =
assertThrows(
UncheckedIOException.class,
() -> GoogleAuthUtils.getWellKnownCredentialsFile(provider));
assertTrue(thrown.getCause() instanceof FileNotFoundException);
assertTrue(thrown.getCause().getMessage().contains("APPDATA"));
}

@Test
void getWellKnownCredentialsPath_correct() {
DefaultCredentialsProvider provider =
Expand Down
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