org.apache.catalina.authenticator

## Class FormAuthenticator

- java.lang.Object
- - org.apache.catalina.util.LifecycleBase
  - - org.apache.catalina.util.LifecycleMBeanBase
    - - org.apache.catalina.valves.ValveBase
      - - org.apache.catalina.authenticator.AuthenticatorBase
        - - org.apache.catalina.authenticator.FormAuthenticator

- All Implemented Interfaces:
    MBeanRegistration, RegistrationListener, Authenticator, Contained, JmxEnabled, Lifecycle, Valve

      public class FormAuthenticator
      extends AuthenticatorBase

  An Authenticator and Valve implementation of FORM BASED Authentication, as described in the Servlet API Specification.
  Author:
    Craig R. McClanahan, Remy Maucherat

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.catalina.authenticator.AuthenticatorBase

      `AuthenticatorBase.AllowCorsPreflight`

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

      `Lifecycle.SingleUse`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `characterEncoding` Character encoding to use to read the username and password parameters from the request.
    `protected String` | `landingPage` Landing page to use if a user tries to access the login page directly or if the session times out during login.

    - ### Fields inherited from class org.apache.catalina.authenticator.AuthenticatorBase

      `alwaysUseSession, AUTH_HEADER_NAME, cache, changeSessionIdOnAuthentication, context, disableProxyCaching, jaspicCallbackHandlerClass, REALM_NAME, securePagesWithPragma, secureRandomAlgorithm, secureRandomClass, secureRandomProvider, sendAuthInfoResponseHeaders, sessionIdGenerator, sm, sso`

    - ### Fields inherited from class org.apache.catalina.valves.ValveBase

      `asyncSupported, container, containerLog, next`

    - ### 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
    `FormAuthenticator()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected boolean` | `doAuthenticate(Request request, HttpServletResponse response)` Authenticate the user making this request, based on the specified login configuration.
    `protected void` | `forwardToErrorPage(Request request, HttpServletResponse response, LoginConfig config)` Called to forward to the error page
    `protected void` | `forwardToLoginPage(Request request, HttpServletResponse response, LoginConfig config)` Called to forward to the login page
    `protected String` | `getAuthMethod()`
    `String` | `getCharacterEncoding()` Return the character encoding to use to read the user name and password.
    `String` | `getLandingPage()` Return the landing page to use when FORM auth is mis-used.
    `protected boolean` | `isContinuationRequired(Request request)` Does this authenticator require that `AuthenticatorBase.authenticate(Request, HttpServletResponse)` is called to continue an authentication process that started in a previous request?
    `protected boolean` | `matchRequest(Request request)` Does this request match the saved one (so that it must be the redirect we signaled after successful authentication?
    `protected void` | `register(Request request, HttpServletResponse response, Principal principal, String authType, String username, String password, boolean alwaysUseSession, boolean cache)` Register an authenticated Principal and authentication type in our request, in the current session (if there is one), and with our SingleSignOn valve, if there is one.
    `protected boolean` | `restoreRequest(Request request, Session session)` Restore the original request from information stored in our session.
    `protected String` | `savedRequestURL(Session session)` Return the request URI (with the corresponding query string, if any) from the saved request so that we can redirect to it.
    `protected void` | `saveRequest(Request request, Session session)` Save the original request information into our session.
    `void` | `setCharacterEncoding(String encoding)` Set the character encoding to be used to read the user name and password.
    `void` | `setLandingPage(String landingPage)` Set the landing page to use when the FORM auth is mis-used.

    - ### Methods inherited from class org.apache.catalina.authenticator.AuthenticatorBase

      `allowCorsPreflightBypass, associate, authenticate, changeSessionID, checkForCachedAuthentication, doLogin, getAllowCorsPreflight, getAlwaysUseSession, getCache, getChangeSessionIdOnAuthentication, getContainer, getDisableProxyCaching, getJaspicCallbackHandlerClass, getRealmName, getSecurePagesWithPragma, getSecureRandomAlgorithm, getSecureRandomClass, getSecureRandomProvider, invoke, isPreemptiveAuthPossible, isSendAuthInfoResponseHeaders, login, logout, notify, reauthenticateFromSSO, register, setAllowCorsPreflight, setAlwaysUseSession, setCache, setChangeSessionIdOnAuthentication, setContainer, setDisableProxyCaching, setJaspicCallbackHandlerClass, setSecurePagesWithPragma, setSecureRandomAlgorithm, setSecureRandomClass, setSecureRandomProvider, setSendAuthInfoResponseHeaders, startInternal, stopInternal`

    - ### Methods inherited from class org.apache.catalina.valves.ValveBase

      `backgroundProcess, getDomainInternal, getNext, getObjectNameKeyProperties, initInternal, isAsyncSupported, setAsyncSupported, setNext, toString`

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

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

    - #### characterEncoding

          protected String characterEncoding

      Character encoding to use to read the username and password parameters from the request. If not set, the encoding of the request body will be used.

    - #### landingPage

          protected String landingPage

      Landing page to use if a user tries to access the login page directly or if the session times out during login. If not set, error responses will be sent instead.

  - ### Constructor Detail

    - #### FormAuthenticator

          public FormAuthenticator()

  - ### Method Detail

    - #### getCharacterEncoding

          public String getCharacterEncoding()

      Return the character encoding to use to read the user name and password.
      Returns:
        The name of the character encoding

    - #### setCharacterEncoding

          public void setCharacterEncoding(String encoding)

      Set the character encoding to be used to read the user name and password.
      Parameters:
        `encoding` - The name of the encoding to use

    - #### getLandingPage

          public String getLandingPage()

      Return the landing page to use when FORM auth is mis-used.
      Returns:
        The path to the landing page relative to the web application root

    - #### setLandingPage

          public void setLandingPage(String landingPage)

      Set the landing page to use when the FORM auth is mis-used.
      Parameters:
        `landingPage` - The path to the landing page relative to the web application root

    - #### doAuthenticate

          protected boolean doAuthenticate(Request request,
                                           HttpServletResponse response)
                                    throws IOException

      Authenticate the user making this request, based on the specified login configuration. Return `true` if any specified constraint has been satisfied, or `false` if we have created a response challenge already.
      Specified by:
        `doAuthenticate` in class `AuthenticatorBase`
      Parameters:
        `request` - Request we are processing
        `response` - Response we are creating
      Returns:
        `true` if the the user was authenticated, otherwise `false`, in which case an authentication challenge will have been written to the response
      Throws:
        `IOException` - if an input/output error occurs

    - #### isContinuationRequired

          protected boolean isContinuationRequired(Request request)

      Description copied from class: `AuthenticatorBase`
      Does this authenticator require that `AuthenticatorBase.authenticate(Request, HttpServletResponse)` is called to continue an authentication process that started in a previous request?
      Overrides:
        `isContinuationRequired` in class `AuthenticatorBase`
      Parameters:
        `request` - The request currently being processed
      Returns:
        `true` if authenticate() must be called, otherwise `false`

    - #### getAuthMethod

          protected String getAuthMethod()

      Specified by:
        `getAuthMethod` in class `AuthenticatorBase`

    - #### register

          protected void register(Request request,
                                  HttpServletResponse response,
                                  Principal principal,
                                  String authType,
                                  String username,
                                  String password,
                                  boolean alwaysUseSession,
                                  boolean cache)

      Description copied from class: `AuthenticatorBase`
      Register an authenticated Principal and authentication type in our request, in the current session (if there is one), and with our SingleSignOn valve, if there is one. Set the appropriate cookie to be returned.
      Overrides:
        `register` in class `AuthenticatorBase`
      Parameters:
        `request` - The servlet request we are processing
        `response` - The servlet response we are generating
        `principal` - The authenticated Principal to be registered
        `authType` - The authentication type to be registered
        `username` - Username used to authenticate (if any)
        `password` - Password used to authenticate (if any)
        `alwaysUseSession` - Should a session always be used once a user is authenticated?
        `cache` - Should we cache authenticated Principals if the request is part of an HTTP session?

    - #### forwardToLoginPage

          protected void forwardToLoginPage(Request request,
                                            HttpServletResponse response,
                                            LoginConfig config)
                                     throws IOException

      Called to forward to the login page
      Parameters:
        `request` - Request we are processing
        `response` - Response we are populating
        `config` - Login configuration describing how authentication should be performed
      Throws:
        `IOException` - If the forward to the login page fails and the call to `HttpServletResponse.sendError(int, String)` throws an `IOException`

    - #### forwardToErrorPage

          protected void forwardToErrorPage(Request request,
                                            HttpServletResponse response,
                                            LoginConfig config)
                                     throws IOException

      Called to forward to the error page
      Parameters:
        `request` - Request we are processing
        `response` - Response we are populating
        `config` - Login configuration describing how authentication should be performed
      Throws:
        `IOException` - If the forward to the error page fails and the call to `HttpServletResponse.sendError(int, String)` throws an `IOException`

    - #### matchRequest

          protected boolean matchRequest(Request request)

      Does this request match the saved one (so that it must be the redirect we signaled after successful authentication?
      Parameters:
        `request` - The request to be verified
      Returns:
        `true` if the requests matched the saved one

    - #### restoreRequest

          protected boolean restoreRequest(Request request,
                                           Session session)
                                    throws IOException

      Restore the original request from information stored in our session. If the original request is no longer present (because the session timed out), return `false`; otherwise, return `true`.
      Parameters:
        `request` - The request to be restored
        `session` - The session containing the saved information
      Returns:
        `true` if the request was successfully restored
      Throws:
        `IOException` - if an IO error occurred during the process

    - #### saveRequest

          protected void saveRequest(Request request,
                                     Session session)
                              throws IOException

      Save the original request information into our session.
      Parameters:
        `request` - The request to be saved
        `session` - The session to contain the saved information
      Throws:
        `IOException` - if an IO error occurred during the process

    - #### savedRequestURL

          protected String savedRequestURL(Session session)

      Return the request URI (with the corresponding query string, if any) from the saved request so that we can redirect to it.
      Parameters:
        `session` - Our current session
      Returns:
        the original request URL

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