org.apache.catalina.realm

## Class MemoryRealm

- java.lang.Object
- - org.apache.catalina.util.LifecycleBase
  - - org.apache.catalina.util.LifecycleMBeanBase
    - - org.apache.catalina.realm.RealmBase
      - - org.apache.catalina.realm.MemoryRealm

- All Implemented Interfaces:
    MBeanRegistration, GSSRealm, JmxEnabled, Lifecycle, Realm
  Direct Known Subclasses:
    JAASMemoryLoginModule

      public class MemoryRealm
      extends RealmBase

  Simple implementation of Realm that reads an XML file to configure the valid users, passwords, and roles. The file format (and default file location) are identical to those currently supported by Tomcat 3.X.

  IMPLEMENTATION NOTE: It is assumed that the in-memory collection representing our defined users (and their roles) is initialized at application startup and never modified again. Therefore, no thread synchronization is performed around accesses to the principals collection.

  Author:
    Craig R. McClanahan

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.catalina.realm.RealmBase

      `RealmBase.AllRolesMode`

    - ### Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

      `Lifecycle.SingleUse`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected static String` | `name` Deprecated. This will be removed in Tomcat 9 onwards.

    - ### Fields inherited from class org.apache.catalina.realm.RealmBase

      `allRolesMode, container, containerLog, realmPath, sm, stripRealmForGss, support, validate, x509UsernameRetriever, x509UsernameRetrieverClassName`

    - ### Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `mserver`

    - ### Fields inherited from interface org.apache.catalina.Lifecycle

      `AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MemoryRealm()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Principal` | `authenticate(String username, String credentials)` Return the Principal associated with the specified username and credentials, if there is one; otherwise return `null`.
    `protected Digester` | `getDigester()`
    `protected String` | `getName()` Deprecated.
    `protected String` | `getPassword(String username)` Get the password for the specified user.
    `String` | `getPathname()`
    `protected Principal` | `getPrincipal(String username)` Get the principal associated with the specified user.
    `void` | `setPathname(String pathname)` Set the pathname of our XML file containing user definitions.
    `protected void` | `startInternal()` Prepare for the beginning of active use of the public methods of this component and implement the requirements of `LifecycleBase.startInternal()`.

    - ### Methods inherited from class org.apache.catalina.realm.RealmBase

      `addPropertyChangeListener, authenticate, authenticate, authenticate, authenticate, authenticate, backgroundProcess, Digest, findSecurityConstraints, getAllRolesMode, getContainer, getCredentialHandler, getDigest, getDomainInternal, getObjectNameKeyProperties, getPrincipal, getPrincipal, getPrincipal, getRealmPath, getRealmSuffix, getRoles, getServer, getTransportGuaranteeRedirectStatus, getValidate, getX509UsernameRetrieverClassName, hasMessageDigest, hasResourcePermission, hasRole, hasRoleInternal, hasUserDataPermission, initInternal, isAvailable, isStripRealmForGss, main, removePropertyChangeListener, setAllRolesMode, setContainer, setCredentialHandler, setRealmPath, setStripRealmForGss, setTransportGuaranteeRedirectStatus, setValidate, setX509UsernameRetrieverClassName, stopInternal, toString`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `destroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleBase

      `addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, getThrowOnFailure, init, removeLifecycleListener, setState, setState, setThrowOnFailure, start, stop`

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

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

- - ### Field Detail

    - #### name

          @Deprecated
          protected static final String name

      Deprecated. This will be removed in Tomcat 9 onwards.
      Descriptive information about this Realm implementation.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### MemoryRealm

          public MemoryRealm()

  - ### Method Detail

    - #### getPathname

          public String getPathname()

      Returns:
        the pathname of our XML file containing user definitions.

    - #### setPathname

          public void setPathname(String pathname)

      Set the pathname of our XML file containing user definitions. If a relative pathname is specified, it is resolved against "catalina.base".
      Parameters:
        `pathname` - The new pathname

    - #### authenticate

          public Principal authenticate(String username,
                               String credentials)

      Return the Principal associated with the specified username and credentials, if there is one; otherwise return `null`.
      Specified by:
        `authenticate` in interface `Realm`
      Overrides:
        `authenticate` in class `RealmBase`
      Parameters:
        `username` - Username of the Principal to look up
        `credentials` - Password or other credentials to use in authenticating this username
      Returns:
        the associated principal, or `null` if there is none.

    - #### getDigester

          protected Digester getDigester()

      Returns:
        a configured `Digester` to use for processing the XML input file, creating a new one if necessary.

    - #### getName

          @Deprecated
          protected String getName()

      Deprecated.
      Specified by:
        `getName` in class `RealmBase`
      Returns:
        a short name for this Realm implementation, for use in log messages.

    - #### getPassword

          protected String getPassword(String username)

      Description copied from class: `RealmBase`
      Get the password for the specified user.
      Specified by:
        `getPassword` in class `RealmBase`
      Parameters:
        `username` - The user name
      Returns:
        the password associated with the given principal's user name.

    - #### getPrincipal

          protected Principal getPrincipal(String username)

      Description copied from class: `RealmBase`
      Get the principal associated with the specified user.
      Specified by:
        `getPrincipal` in class `RealmBase`
      Parameters:
        `username` - The user name
      Returns:
        the Principal associated with the given user name.

    - #### startInternal

          protected void startInternal()
                                throws LifecycleException

      Prepare for the beginning of active use of the public methods of this component and implement the requirements of `LifecycleBase.startInternal()`.
      Overrides:
        `startInternal` in class `RealmBase`
      Throws:
        `LifecycleException` - if this component detects a fatal error that prevents this component from being used

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