anujmodi2021 commented on code in PR #6552:
URL: https://github.com/apache/hadoop/pull/6552#discussion_r1548933832
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AbfsConfiguration.java:
##########
@@ -976,33 +977,60 @@ public AccessTokenProvider getTokenProvider() throws
TokenAccessProviderExceptio
}
}
+ /**
+ * Returns the SASTokenProvider implementation to be used to generate SAS
token.<br>
+ * Users can choose between a custom implementation of {@link
SASTokenProvider}
+ * or an in house implementation {@link FixedSASTokenProvider}.<br>
+ * For Custom implementation "fs.azure.sas.token.provider.type" needs to be
provided.<br>
+ * For Fixed SAS Token use "fs.azure.sas.fixed.token" needs to be
provided.<br>
+ * In case both are provided, Preference will be given to Custom
implementation.<br>
+ * Avoid using a custom tokenProvider implementation just to read the
configured
+ * fixed token, as this could create confusion. Also,implementing the
SASTokenProvider
+ * requires relying on the raw configurations. It is more stable to depend on
+ * the AbfsConfiguration with which a filesystem is initialized, and
eliminate
+ * chances of dynamic modifications and spurious situations.<br>
+ * @return sasTokenProvider object based on configurations provided
+ * @throws AzureBlobFileSystemException
+ */
public SASTokenProvider getSASTokenProvider() throws
AzureBlobFileSystemException {
AuthType authType = getEnum(FS_AZURE_ACCOUNT_AUTH_TYPE_PROPERTY_NAME,
AuthType.SharedKey);
if (authType != AuthType.SAS) {
throw new SASTokenProviderException(String.format(
- "Invalid auth type: %s is being used, expecting SAS", authType));
+ "Invalid auth type: %s is being used, expecting SAS.", authType));
}
try {
- String configKey = FS_AZURE_SAS_TOKEN_PROVIDER_TYPE;
- Class<? extends SASTokenProvider> sasTokenProviderClass =
- getTokenProviderClass(authType, configKey, null,
- SASTokenProvider.class);
-
- Preconditions.checkArgument(sasTokenProviderClass != null,
- String.format("The configuration value for \"%s\" is invalid.",
configKey));
-
- SASTokenProvider sasTokenProvider = ReflectionUtils
- .newInstance(sasTokenProviderClass, rawConfig);
- Preconditions.checkArgument(sasTokenProvider != null,
- String.format("Failed to initialize %s", sasTokenProviderClass));
-
- LOG.trace("Initializing {}", sasTokenProviderClass.getName());
- sasTokenProvider.initialize(rawConfig, accountName);
- LOG.trace("{} init complete", sasTokenProviderClass.getName());
- return sasTokenProvider;
+ Class<? extends SASTokenProvider> customSasTokenProviderImplementation =
+ getTokenProviderClass(authType, FS_AZURE_SAS_TOKEN_PROVIDER_TYPE,
+ null, SASTokenProvider.class);
+ String configuredFixedToken =
this.rawConfig.get(FS_AZURE_SAS_FIXED_TOKEN,
+ null);
+
+ Preconditions.checkArgument(
+ customSasTokenProviderImplementation != null || configuredFixedToken
!= null,
+ "At least one of the \"%s\" and \"%s\" must be set.",
+ FS_AZURE_SAS_TOKEN_PROVIDER_TYPE, FS_AZURE_SAS_FIXED_TOKEN);
+
+ // Prefer Custom SASTokenProvider Implementation if configured.
+ if (customSasTokenProviderImplementation != null) {
+ LOG.trace("Using Custom SASTokenProvider implementation because it is
given precedence when it is set.");
+ SASTokenProvider sasTokenProvider = ReflectionUtils.newInstance(
+ customSasTokenProviderImplementation, rawConfig);
+ Preconditions.checkArgument(sasTokenProvider != null,
+ "Failed to initialize %s", customSasTokenProviderImplementation);
+
+ LOG.trace("Initializing {}",
customSasTokenProviderImplementation.getName());
+ sasTokenProvider.initialize(rawConfig, accountName);
+ LOG.trace("{} init complete",
customSasTokenProviderImplementation.getName());
+ return sasTokenProvider;
+ } else {
+ LOG.trace("Using FixedSASTokenProvider implementation");
+ FixedSASTokenProvider fixedSASTokenProvider = new
FixedSASTokenProvider(configuredFixedToken);
+ return fixedSASTokenProvider;
+ }
} catch (Exception e) {
- throw new TokenAccessProviderException("Unable to load SAS token
provider class: " + e, e);
+ throw new TokenAccessProviderException(
+ "Unable to load SAS token provider class: " + e, e);
Review Comment:
Can you elaborate with an example?? Not familiar with the usage of {} in
concatenation..
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