org.apache.storm.security.auth

## Class DefaultPrincipalToLocal

- java.lang.Object
- - org.apache.storm.security.auth.DefaultPrincipalToLocal

- All Implemented Interfaces:
    IPrincipalToLocal

      public class DefaultPrincipalToLocal
      extends Object
      implements IPrincipalToLocal

  Storm can be configured to launch worker processed as a given user. Some transports need to map the Principal to a local user name.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultPrincipalToLocal()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `prepare(Map<String,Object> topoConf)` Invoked once immediately after construction.
    `String` | `toLocal(String principal)` Convert a Principal to a local user name.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.apache.storm.security.auth.IPrincipalToLocal

      `toLocal`

- - ### Constructor Detail

    - #### DefaultPrincipalToLocal

          public DefaultPrincipalToLocal()

  - ### Method Detail

    - #### prepare

          public void prepare(Map<String,Object> topoConf)

      Invoked once immediately after construction.

      Specified by:
        `prepare` in interface `IPrincipalToLocal`
      Parameters:
        `topoConf` - Storm configuration

    - #### toLocal

          public String toLocal(String principal)

      Convert a Principal to a local user name.

      Specified by:
        `toLocal` in interface `IPrincipalToLocal`
      Parameters:
        `principal` - the principal to convert
      Returns:
        The local user name.

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