Github user ktseytlin commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1112#discussion_r82453054
  
    --- Diff: 
nifi-nar-bundles/nifi-aws-bundle/nifi-aws-processors/src/main/java/org/apache/nifi/processors/aws/credentials/provider/factory/strategies/AssumeRoleCredentialsStrategy.java
 ---
    @@ -113,16 +134,34 @@ public AWSCredentialsProvider 
getDerivedCredentialsProvider(Map<PropertyDescript
             rawMaxSessionTime = (rawMaxSessionTime != null) ? 
rawMaxSessionTime : MAX_SESSION_TIME.getDefaultValue();
             final Integer maxSessionTime = 
Integer.parseInt(rawMaxSessionTime.trim());
             final String assumeRoleExternalId = 
properties.get(ASSUME_ROLE_EXTERNAL_ID);
    +        STSAssumeRoleSessionCredentialsProvider.Builder builder;
    +
    +        // If proxy variables are set, then create Client Configuration 
with those values
    +        if (proxyVariablesValidForAssumeRole(properties)) {
    +            final String assumeRoleProxyHost = 
properties.get(ASSUME_ROLE_PROXY_HOST);
    +            final Integer assumeRoleProxyPort = 
Integer.parseInt(properties.get(ASSUME_ROLE_PROXY_PORT));
    +            ClientConfiguration config = new ClientConfiguration();
    +            config.withProxyHost(assumeRoleProxyHost);
    +            config.withProxyPort(assumeRoleProxyPort);
    +            AWSSecurityTokenService securityTokenService = new 
AWSSecurityTokenServiceClient(config);
    --- End diff --
    
    Also I don't think the code you posted will work. You can't pass in both 
primaryCredentialsProvider and config through the AWSSecurityTokenService. The 
part I'm talking about is below:
    ```
    AWSSecurityTokenService securityTokenService = new 
AWSSecurityTokenServiceClient(primaryCredentialsProvider, config);
    ```
    I think you can only do either primaryCredentialsProvider or config, but 
not both.


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