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## edu.internet2.middleware.shibboleth.idp.util
Class HttpServletHelper

    java.lang.Object
      edu.internet2.middleware.shibboleth.idp.util.HttpServletHelper

    public class HttpServletHelper

extends Object

A helper class that provides access to internal state from Servlets and hence also JSPs.

Field Summary
`static String` | `ATTRIBUTE_FILTER_ENGINE_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `AttributeFilteringEngine` service: "AttributeFilterEngineId" .
`static String` | `ATTRIBUTE_RESOLVER_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `AttributeResolver` service: "AttributeResolverId" .
`static String` | `DEFAULT_ATTRIBUTE_FILTER_ENGINE_SID` Default ID by which the `AttributeFilteringEngine` is know within the Servlet context: "shibboleth.AttributeFilterEngine" .
`static String` | `DEFAULT_ATTRIBUTE_RESOLVER_SID` Default ID by which the `AttributeResolver` is know within the Servlet context: "shibboleth.AttributeResolver" .
`static String` | `DEFAULT_LOGIN_CTX_PARITION` Default name for the `StorageService` partition which holds `LoginContext`s: "loginContexts" .
`static String` | `DEFAULT_PROFILE_HANDLER_MNGR_SID` Default ID by which the `IdPProfileHandlerManager` is know within the Servlet context: "shibboleth.HandlerManager" .
`static String` | `DEFAULT_RP_CONFIG_MNGR_SID` Default ID by which the `RelyingPartyConfigurationManager` is know within the Servlet context: "shibboleth.RelyingPartyConfigurationManager" .
`static String` | `DEFAULT_SAML1_AA_SID` Default ID by which the `SAML1AttributeAuthority` is know within the Servlet context: "shibboleth.SAML1AttributeAuthority" .
`static String` | `DEFAULT_SAML2_AA_SID` Default ID by which the `SAML2AttributeAuthority` is know within the Servlet context: "shibboleth.SAML2AttributeAuthority" .
`static String` | `DEFAULT_SESSION_MNGR_SID` Default ID by which the `SessionManager` is know within the Servlet context: "shibboleth.SessionManager" .
`static String` | `DEFAULT_STORAGE_SERVICE_SID` Default ID by which the `StorageService` is know within the Servlet context: "shibboleth.StorageService" .
`static String` | `IDP_SESSION_COOKIE` Name of the cookie containing the IdP session ID: "_idp_session" .
`static String` | `LOGIN_CTX_KEY_NAME` Name of the key to the current authentication login context: "_idp_authn_lc_key" .
`static String` | `LOGIN_CTX_PARTITION_CTX_PARAM` `ServletContext` parameter name bearing the name of the `StorageService` partition into which `LoginContext`s are stored: "loginContextPartitionName" .
`static String` | `PROFILE_HANDLER_MNGR_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `IdPProfileHandlerManager` service: "ProfileHandlerMngrId" .
`static String` | `RP_CONFIG_MNGR_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `RelyingPartyConfigurationManager` service: * * * "RelyingPartyConfigurationManagerId" .
`static String` | `SAML1_AA_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `SAML1AttributeAuthority` service: "SAML1AttributeAuthorityId" .
`static String` | `SAML2_AA_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `SAML2AttributeAuthority` service: "SAML2AttributeAuthorityId" .
`static String` | `SESSION_MNGR_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `SessionManager` service: "SessionManagerId" .
`static String` | `STORAGE_SERVICE_SID_CTX_PARAM` `ServletContext` parameter name bearing the ID of the `SAML1AttributeAuthority` service: "StorageServiceId" .

Constructor Summary
`HttpServletHelper()`

Method Summary
`static void` | `bindLoginContext(LoginContext loginContext, javax.servlet.http.HttpServletRequest httpRequest)` Binds a `LoginContext` to the current request.
`static void` | `bindLoginContext(LoginContext loginContext, org.opensaml.util.storage.StorageService storageService, javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse)` Binds a `LoginContext` to the issuer of the current request.
`static edu.internet2.middleware.shibboleth.common.attribute.filtering.AttributeFilteringEngine<?>` | `getAttributeFilterEnginer(javax.servlet.ServletContext context)` Gets the `AttributeFilteringEngine` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.filtering.AttributeFilteringEngine<?>` | `getAttributeFilterEnginer(javax.servlet.ServletContext context, String serviceId)` Gets the `AttributeFilteringEngine` bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.resolver.AttributeResolver<?>` | `getAttributeResolver(javax.servlet.ServletContext context)` Gets the `AttributeResolver` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.resolver.AttributeResolver<?>` | `getAttributeResolver(javax.servlet.ServletContext context, String serviceId)` Gets the `AttributeResolver` bound to the Servlet context.
`static String` | `getContextParam(javax.servlet.ServletContext context, String name, String defaultValue)` Gets a value for a given context parameter.
`static javax.servlet.http.Cookie` | `getCookie(javax.servlet.http.HttpServletRequest httpRequest, String cookieName)` Gets the first `Cookie` whose name matches the given name.
`static LoginContext` | `getLoginContext(javax.servlet.http.HttpServletRequest httpRequest)` Gets the login context from the current request.
`static LoginContext` | `getLoginContext(org.opensaml.util.storage.StorageService storageService, javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest httpRequest)` Gets the `LoginContext` for the user issuing the HTTP request.
`static IdPProfileHandlerManager` | `getProfileHandlerManager(javax.servlet.ServletContext context)` Gets the `IdPProfileHandlerManager` service bound to the Servlet context.
`static IdPProfileHandlerManager` | `getProfileHandlerManager(javax.servlet.ServletContext context, String serviceId)` Gets the `IdPProfileHandlerManager` bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager` | `getRelyingPartyConfirmationManager(javax.servlet.ServletContext context)` Gets the `RelyingPartyConfigurationManager` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager` | `getRelyingPartyConfirmationManager(javax.servlet.ServletContext context, String serviceId)` Gets the `RelyingPartyConfigurationManager` bound to the Servlet context.
`static org.opensaml.saml2.metadata.EntityDescriptor` | `getRelyingPartyMetadata(String relyingPartyEntityId, edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager rpConfigMngr)` Gets the metatdata for a given relying party.
`static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML1AttributeAuthority` | `getSAML1AttributeAuthority(javax.servlet.ServletContext context)` Gets the `SAML1AttributeAuthority` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML1AttributeAuthority` | `getSAML1AttributeAuthority(javax.servlet.ServletContext context, String serviceId)` Gets the `SAML1AttributeAuthority` bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML2AttributeAuthority` | `getSAML2AttributeAuthority(javax.servlet.ServletContext context)` Gets the `SAML2AttributeAuthority` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML2AttributeAuthority` | `getSAML2AttributeAuthority(javax.servlet.ServletContext context, String serviceId)` Gets the `SAML2AttributeAuthority` bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.session.SessionManager<Session>` | `getSessionManager(javax.servlet.ServletContext context)` Gets the `SessionManager` service bound to the Servlet context.
`static edu.internet2.middleware.shibboleth.common.session.SessionManager<Session>` | `getSessionManager(javax.servlet.ServletContext context, String serviceId)` Gets the `SessionManager` bound to the Servlet context.
`static org.opensaml.util.storage.StorageService<?,?>` | `getStorageService(javax.servlet.ServletContext context)` Gets the `StorageService` service bound to the Servlet context.
`static org.opensaml.util.storage.StorageService<?,?>` | `getStorageService(javax.servlet.ServletContext context, String serviceId)` Gets the `StorageService` bound to the Servlet context.
`static Session` | `getUserSession(javax.servlet.http.HttpServletRequest httpRequest)` Gets the user session from the request.
`static LoginContext` | `unbindLoginContext(org.opensaml.util.storage.StorageService storageService, javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest httpRequest, javax.servlet.http.HttpServletResponse httpResponse)` Unbinds a `LoginContext` from the current request.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### IDP_SESSION_COOKIE

    public static final String IDP_SESSION_COOKIE

  Name of the cookie containing the IdP session ID: "_idp_session" .

  See Also:
    Constant Field Values

### LOGIN_CTX_KEY_NAME

    public static final String LOGIN_CTX_KEY_NAME

  Name of the key to the current authentication login context: "_idp_authn_lc_key" .

  See Also:
    Constant Field Values

### ATTRIBUTE_FILTER_ENGINE_SID_CTX_PARAM

    public static final String ATTRIBUTE_FILTER_ENGINE_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `AttributeFilteringEngine` service: "AttributeFilterEngineId" .

  See Also:
    Constant Field Values

### ATTRIBUTE_RESOLVER_SID_CTX_PARAM

    public static final String ATTRIBUTE_RESOLVER_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `AttributeResolver` service: "AttributeResolverId" .

  See Also:
    Constant Field Values

### LOGIN_CTX_PARTITION_CTX_PARAM

    public static final String LOGIN_CTX_PARTITION_CTX_PARAM

  `ServletContext` parameter name bearing the name of the `StorageService` partition into which `LoginContext`s are stored: "loginContextPartitionName" .

  See Also:
    Constant Field Values

### PROFILE_HANDLER_MNGR_SID_CTX_PARAM

    public static final String PROFILE_HANDLER_MNGR_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `IdPProfileHandlerManager` service: "ProfileHandlerMngrId" .

  See Also:
    Constant Field Values

### RP_CONFIG_MNGR_SID_CTX_PARAM

    public static final String RP_CONFIG_MNGR_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `RelyingPartyConfigurationManager` service: * * * "RelyingPartyConfigurationManagerId" .

  See Also:
    Constant Field Values

### SAML1_AA_SID_CTX_PARAM

    public static final String SAML1_AA_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `SAML1AttributeAuthority` service: "SAML1AttributeAuthorityId" .

  See Also:
    Constant Field Values

### SAML2_AA_SID_CTX_PARAM

    public static final String SAML2_AA_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `SAML2AttributeAuthority` service: "SAML2AttributeAuthorityId" .

  See Also:
    Constant Field Values

### SESSION_MNGR_SID_CTX_PARAM

    public static final String SESSION_MNGR_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `SessionManager` service: "SessionManagerId" .

  See Also:
    Constant Field Values

### STORAGE_SERVICE_SID_CTX_PARAM

    public static final String STORAGE_SERVICE_SID_CTX_PARAM

  `ServletContext` parameter name bearing the ID of the `SAML1AttributeAuthority` service: "StorageServiceId" .

  See Also:
    Constant Field Values

### DEFAULT_ATTRIBUTE_FILTER_ENGINE_SID

    public static final String DEFAULT_ATTRIBUTE_FILTER_ENGINE_SID

  Default ID by which the `AttributeFilteringEngine` is know within the Servlet context: "shibboleth.AttributeFilterEngine" .

  See Also:
    Constant Field Values

### DEFAULT_ATTRIBUTE_RESOLVER_SID

    public static final String DEFAULT_ATTRIBUTE_RESOLVER_SID

  Default ID by which the `AttributeResolver` is know within the Servlet context: "shibboleth.AttributeResolver" .

  See Also:
    Constant Field Values

### DEFAULT_LOGIN_CTX_PARITION

    public static final String DEFAULT_LOGIN_CTX_PARITION

  Default name for the `StorageService` partition which holds `LoginContext`s: "loginContexts" .

  See Also:
    Constant Field Values

### DEFAULT_PROFILE_HANDLER_MNGR_SID

    public static final String DEFAULT_PROFILE_HANDLER_MNGR_SID

  Default ID by which the `IdPProfileHandlerManager` is know within the Servlet context: "shibboleth.HandlerManager" .

  See Also:
    Constant Field Values

### DEFAULT_RP_CONFIG_MNGR_SID

    public static final String DEFAULT_RP_CONFIG_MNGR_SID

  Default ID by which the `RelyingPartyConfigurationManager` is know within the Servlet context: "shibboleth.RelyingPartyConfigurationManager" .

  See Also:
    Constant Field Values

### DEFAULT_SAML1_AA_SID

    public static final String DEFAULT_SAML1_AA_SID

  Default ID by which the `SAML1AttributeAuthority` is know within the Servlet context: "shibboleth.SAML1AttributeAuthority" .

  See Also:
    Constant Field Values

### DEFAULT_SAML2_AA_SID

    public static final String DEFAULT_SAML2_AA_SID

  Default ID by which the `SAML2AttributeAuthority` is know within the Servlet context: "shibboleth.SAML2AttributeAuthority" .

  See Also:
    Constant Field Values

### DEFAULT_SESSION_MNGR_SID

    public static final String DEFAULT_SESSION_MNGR_SID

  Default ID by which the `SessionManager` is know within the Servlet context: "shibboleth.SessionManager" .

  See Also:
    Constant Field Values

### DEFAULT_STORAGE_SERVICE_SID

    public static final String DEFAULT_STORAGE_SERVICE_SID

  Default ID by which the `StorageService` is know within the Servlet context: "shibboleth.StorageService" .

  See Also:
    Constant Field Values

Constructor Detail

### HttpServletHelper

    public HttpServletHelper()

Method Detail

### bindLoginContext

    public static void bindLoginContext(LoginContext loginContext,
                                        javax.servlet.http.HttpServletRequest httpRequest)

  Binds a `LoginContext` to the current request.

  Parameters:
    `loginContext` - login context to be bound
    `httpRequest` - current HTTP request

### bindLoginContext

    public static void bindLoginContext(LoginContext loginContext,
                                        org.opensaml.util.storage.StorageService storageService,
                                        javax.servlet.ServletContext context,
                                        javax.servlet.http.HttpServletRequest httpRequest,
                                        javax.servlet.http.HttpServletResponse httpResponse)

  Binds a `LoginContext` to the issuer of the current request. The binding is done by creating a random UUID, placing that in a cookie in the request, and storing the context in to the storage service under that key.

  Parameters:
    `loginContext` - the login context to be bound
    `storageService` - the storage service which will hold the context
    `context` - the Servlet context
    `httpRequest` - the current HTTP request
    `httpResponse` - the current HTTP response

### getAttributeFilterEnginer

    public static edu.internet2.middleware.shibboleth.common.attribute.filtering.AttributeFilteringEngine<?> getAttributeFilterEnginer(javax.servlet.ServletContext context)

  Gets the `AttributeFilteringEngine` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getAttributeFilterEnginer

    public static edu.internet2.middleware.shibboleth.common.attribute.filtering.AttributeFilteringEngine<?> getAttributeFilterEnginer(javax.servlet.ServletContext context,
                                                                                                                                       String serviceId)

  Gets the `AttributeFilteringEngine` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getAttributeResolver

    public static edu.internet2.middleware.shibboleth.common.attribute.resolver.AttributeResolver<?> getAttributeResolver(javax.servlet.ServletContext context)

  Gets the `AttributeResolver` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getAttributeResolver

    public static edu.internet2.middleware.shibboleth.common.attribute.resolver.AttributeResolver<?> getAttributeResolver(javax.servlet.ServletContext context,
                                                                                                                          String serviceId)

  Gets the `AttributeResolver` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getContextParam

    public static String getContextParam(javax.servlet.ServletContext context,
                                         String name,
                                         String defaultValue)

  Gets a value for a given context parameter. If no value is present the default value is used.

  Parameters:
    `context` - the Servlet context
    `name` - name of the context parameter
    `defaultValue` - default value of the parameter
  Returns:
    the value of the context parameter or the default value if the parameter is not set or does not contain a value

### getCookie

    public static javax.servlet.http.Cookie getCookie(javax.servlet.http.HttpServletRequest httpRequest,
                                                      String cookieName)

  Gets the first `Cookie` whose name matches the given name.

  Parameters:
    `cookieName` - the cookie name
    `httpRequest` - HTTP request from which the cookie should be extracted
  Returns:
    the cookie or null if no cookie with that name was given

### getLoginContext

    public static LoginContext getLoginContext(javax.servlet.http.HttpServletRequest httpRequest)

  Gets the login context from the current request. The login context is only in this location while the request is being transferred from the authentication engine back to the profile handler.

  Parameters:
    `httpRequest` - current HTTP request
  Returns:
    the login context or null if no login context is bound to the request

### getLoginContext

    public static LoginContext getLoginContext(org.opensaml.util.storage.StorageService storageService,
                                               javax.servlet.ServletContext context,
                                               javax.servlet.http.HttpServletRequest httpRequest)

  Gets the `LoginContext` for the user issuing the HTTP request. Note, login contexts are only available during the authentication process.

  Parameters:
    `context` - the Servlet context
    `storageService` - storage service to use when retrieving the login context
    `httpRequest` - current HTTP request
  Returns:
    the login context or null if none is available

### getProfileHandlerManager

    public static IdPProfileHandlerManager getProfileHandlerManager(javax.servlet.ServletContext context)

  Gets the `IdPProfileHandlerManager` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getProfileHandlerManager

    public static IdPProfileHandlerManager getProfileHandlerManager(javax.servlet.ServletContext context,
                                                                    String serviceId)

  Gets the `IdPProfileHandlerManager` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getRelyingPartyConfirmationManager

    public static edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager getRelyingPartyConfirmationManager(javax.servlet.ServletContext context)

  Gets the `RelyingPartyConfigurationManager` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getRelyingPartyConfirmationManager

    public static edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager getRelyingPartyConfirmationManager(javax.servlet.ServletContext context,
                                                                                                                                              String serviceId)

  Gets the `RelyingPartyConfigurationManager` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getRelyingPartyMetadata

    public static org.opensaml.saml2.metadata.EntityDescriptor getRelyingPartyMetadata(String relyingPartyEntityId,
                                                                                       edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfigurationManager rpConfigMngr)

  Gets the metatdata for a given relying party.

  Parameters:
    `relyingPartyEntityId` - the ID of the relying party
    `rpConfigMngr` - relying party configuration manager
  Returns:
    the metadata for the relying party or null if no SAML metadata exists for the given relying party

### getSAML1AttributeAuthority

    public static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML1AttributeAuthority getSAML1AttributeAuthority(javax.servlet.ServletContext context)

  Gets the `SAML1AttributeAuthority` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getSAML1AttributeAuthority

    public static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML1AttributeAuthority getSAML1AttributeAuthority(javax.servlet.ServletContext context,
                                                                                                                                   String serviceId)

  Gets the `SAML1AttributeAuthority` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getSAML2AttributeAuthority

    public static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML2AttributeAuthority getSAML2AttributeAuthority(javax.servlet.ServletContext context)

  Gets the `SAML2AttributeAuthority` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getSAML2AttributeAuthority

    public static edu.internet2.middleware.shibboleth.common.attribute.provider.SAML2AttributeAuthority getSAML2AttributeAuthority(javax.servlet.ServletContext context,
                                                                                                                                   String serviceId)

  Gets the `SAML2AttributeAuthority` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getSessionManager

    public static edu.internet2.middleware.shibboleth.common.session.SessionManager<Session> getSessionManager(javax.servlet.ServletContext context)

  Gets the `SessionManager` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getSessionManager

    public static edu.internet2.middleware.shibboleth.common.session.SessionManager<Session> getSessionManager(javax.servlet.ServletContext context,
                                                                                                               String serviceId)

  Gets the `SessionManager` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getStorageService

    public static org.opensaml.util.storage.StorageService<?,?> getStorageService(javax.servlet.ServletContext context)

  Gets the `StorageService` service bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
  Returns:
    the service or null if there is no such service bound to the context

### getStorageService

    public static org.opensaml.util.storage.StorageService<?,?> getStorageService(javax.servlet.ServletContext context,
                                                                                  String serviceId)

  Gets the `StorageService` bound to the Servlet context.

  Parameters:
    `context` - the Servlet context
    `serviceId` - the ID under which the service bound
  Returns:
    the service or null if there is no such service bound to the context

### getUserSession

    public static Session getUserSession(javax.servlet.http.HttpServletRequest httpRequest)

  Gets the user session from the request. Retrieving the session in this manner does NOT update the last activity time of the session.

  Parameters:
    `httpRequest` - current request
  Returns:
    the users session, if one exists

### unbindLoginContext

    public static LoginContext unbindLoginContext(org.opensaml.util.storage.StorageService storageService,
                                                  javax.servlet.ServletContext context,
                                                  javax.servlet.http.HttpServletRequest httpRequest,
                                                  javax.servlet.http.HttpServletResponse httpResponse)

  Unbinds a `LoginContext` from the current request. The unbinding results in the destruction of the associated context key cookie and removes the context from the storage service.

  Parameters:
    `storageService` - storage service holding the context
    `context` - the Servlet context
    `httpRequest` - current HTTP request
    `httpResponse` - current HTTP response
  Returns:
    the login context that was unbound or null if there was no bound context

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