Package org.owasp.esapi

Interface HTTPUtilities

  • All Known Implementing Classes:
    DefaultHTTPUtilities
    public interface HTTPUtilities
    The HTTPUtilities interface is a collection of methods that provide additional security related to HTTP requests, responses, sessions, cookies, headers, and logging.
    Since:
    June 1, 2007
    Author:
    Jeff Williams (jeff.williams .at. aspectsecurity.com) Aspect Security

    • Method Summary

      All Methods Instance Methods Abstract Methods Deprecated Methods 
      Modifier and Type Method Description
      void addCookie​(javax.servlet.http.Cookie cookie)
      Calls addCookie with the *current* request.
      void addCookie​(javax.servlet.http.HttpServletResponse response, javax.servlet.http.Cookie cookie)
      Add a cookie to the response after ensuring that there are no encoded or illegal characters in the name and name and value.
      java.lang.String addCSRFToken​(java.lang.String href)
      Adds the current user's CSRF token (see User.getCSRFToken()) to the URL for purposes of preventing CSRF attacks.
      void addHeader​(java.lang.String name, java.lang.String value)
      Calls addHeader with the *current* request.
      void addHeader​(javax.servlet.http.HttpServletResponse response, java.lang.String name, java.lang.String value)
      Add a header to the response after ensuring that there are no encoded or illegal characters in the name and name and value.
      void assertSecureChannel()
      Calls assertSecureChannel with the *current* request.
      void assertSecureChannel​(javax.servlet.http.HttpServletRequest request)
      Ensures the use of SSL to protect any sensitive parameters in the request and any sensitive data in the response.
      void assertSecureRequest()
      Calls assertSecureRequest with the *current* request.
      void assertSecureRequest​(javax.servlet.http.HttpServletRequest request)
      Ensures that the request uses both SSL and POST to protect any sensitive parameters in the querystring from being sniffed, logged, bookmarked, included in referer header, etc...
      javax.servlet.http.HttpSession changeSessionIdentifier()
      Calls changeSessionIdentifier with the *current* request.
      javax.servlet.http.HttpSession changeSessionIdentifier​(javax.servlet.http.HttpServletRequest request)
      Invalidate the existing session after copying all of its contents to a newly created session with a new session id.
      void clearCurrent()
      Clears the current HttpRequest and HttpResponse associated with the current thread.
      java.lang.String decryptHiddenField​(java.lang.String encrypted)
      Decrypts an encrypted hidden field value and returns the cleartext.
      java.util.Map<java.lang.String,​java.lang.String> decryptQueryString​(java.lang.String encrypted)
      Takes an encrypted querystring and returns a Map containing the original parameters.
      java.util.Map<java.lang.String,​java.lang.String> decryptStateFromCookie()
      Calls decryptStateFromCookie with the *current* request.
      java.util.Map<java.lang.String,​java.lang.String> decryptStateFromCookie​(javax.servlet.http.HttpServletRequest request)
      Retrieves a map of data from a cookie encrypted with encryptStateInCookie().
      java.lang.String encryptHiddenField​(java.lang.String value)
      Encrypts a hidden field value for use in HTML.
      java.lang.String encryptQueryString​(java.lang.String query)
      Takes a querystring (everything after the question mark in the URL) and returns an encrypted string containing the parameters.
      void encryptStateInCookie​(java.util.Map<java.lang.String,​java.lang.String> cleartext)
      Calls encryptStateInCookie with the *current* response.
      void encryptStateInCookie​(javax.servlet.http.HttpServletResponse response, java.util.Map<java.lang.String,​java.lang.String> cleartext)
      Stores a Map of data in an encrypted cookie.
      java.lang.String getCookie​(java.lang.String name)
      Calls getCookie with the *current* response.
      java.lang.String getCookie​(javax.servlet.http.HttpServletRequest request, java.lang.String name)
      A safer replacement for getCookies() in HttpServletRequest that returns the canonicalized value of the named cookie after "global" validation against the general type defined in ESAPI.properties.
      java.lang.String getCSRFToken()
      Returns the current user's CSRF token.
      javax.servlet.http.HttpServletRequest getCurrentRequest()
      Retrieves the current HttpServletRequest
      javax.servlet.http.HttpServletResponse getCurrentResponse()
      Retrieves the current HttpServletResponse
      java.util.List getFileUploads()
      Calls getFileUploads with the *current* request, default upload directory, and default allowed file extensions
      java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request)
      Call getFileUploads with the specified request, default upload directory, and default allowed file extensions
      java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request, java.io.File finalDir)
      Call getFileUploads with the specified request, specified upload directory, and default allowed file extensions
      java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request, java.io.File destinationDir, java.util.List allowedExtensions)
      Extract uploaded files from a multipart HTTP requests.
      java.lang.String getHeader​(java.lang.String name)
      Calls getHeader with the *current* request.
      java.lang.String getHeader​(javax.servlet.http.HttpServletRequest request, java.lang.String name)
      A safer replacement for getHeader() in HttpServletRequest that returns the canonicalized value of the named header after "global" validation against the general type defined in ESAPI.properties.
      java.lang.String getParameter​(java.lang.String name)
      Calls getParameter with the *current* request.
      java.lang.String getParameter​(javax.servlet.http.HttpServletRequest request, java.lang.String name)
      A safer replacement for getParameter() in HttpServletRequest that returns the canonicalized value of the named parameter after "global" validation against the general type defined in ESAPI.properties.
      <T> T getRequestAttribute​(java.lang.String key)
      Gets a typed attribute from the HttpServletRequest associated with the caller thread.
      <T> T getRequestAttribute​(javax.servlet.http.HttpServletRequest request, java.lang.String key)
      Gets a typed attribute from the HttpServletRequest associated with the passed in request.
      <T> T getSessionAttribute​(java.lang.String key)
      Gets a typed attribute from the session associated with the calling thread.
      <T> T getSessionAttribute​(javax.servlet.http.HttpSession session, java.lang.String key)
      Gets a typed attribute from the passed in session.
      void killAllCookies()
      Calls killAllCookies with the *current* request and response.
      void killAllCookies​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
      Kill all cookies received in the last request from the browser.
      void killCookie​(java.lang.String name)
      Calls killCookie with the *current* request and response.
      void killCookie​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String name)
      Kills the specified cookie by setting a new cookie that expires immediately.
      void logHTTPRequest()
      Calls logHTTPRequest with the *current* request and logger.
      void logHTTPRequest​(javax.servlet.http.HttpServletRequest request, Logger logger)
      Format the Source IP address, URL, URL parameters, and all form parameters into a string suitable for the log file.
      void logHTTPRequest​(javax.servlet.http.HttpServletRequest request, Logger logger, java.util.List parameterNamesToObfuscate)
      Format the Source IP address, URL, URL parameters, and all form parameters into a string suitable for the log file.
      void sendForward​(java.lang.String location)
      Calls sendForward with the *current* request and response.
      void sendForward​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String location)
      This method performs a forward to any resource located inside the WEB-INF directory.
      void sendRedirect​(java.lang.String location)
      Calls sendRedirect with the *current* response.
      void sendRedirect​(javax.servlet.http.HttpServletResponse response, java.lang.String location)
      This method performs a forward to any resource located inside the WEB-INF directory.
      void setContentType()
      Calls setContentType with the *current* request and response.
      void setContentType​(javax.servlet.http.HttpServletResponse response)
      Set the content type character encoding header on every HttpServletResponse in order to limit the ways in which the input data can be represented.
      void setCurrentHTTP​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
      Stores the current HttpRequest and HttpResponse so that they may be readily accessed throughout ESAPI (and elsewhere)
      void setHeader​(java.lang.String name, java.lang.String value)
      Calls setHeader with the *current* response.
      void setHeader​(javax.servlet.http.HttpServletResponse response, java.lang.String name, java.lang.String value)
      Add a header to the response after ensuring that there are no encoded or illegal characters in the name and value.
      void setNoCacheHeaders()
      Calls setNoCacheHeaders with the *current* response.
      void setNoCacheHeaders​(javax.servlet.http.HttpServletResponse response)
      Set headers to protect sensitive information against being cached in the browser.
      java.lang.String setRememberToken​(java.lang.String password, int maxAge, java.lang.String domain, java.lang.String path)
      Deprecated.
      java.lang.String setRememberToken​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, int maxAge, java.lang.String domain, java.lang.String path)  
      java.lang.String setRememberToken​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String password, int maxAge, java.lang.String domain, java.lang.String path)
      Deprecated.
      void verifyCSRFToken()
      Calls verifyCSRFToken with the *current* request.
      void verifyCSRFToken​(javax.servlet.http.HttpServletRequest request)
      Checks the CSRF token in the URL (see User.getCSRFToken()) against the user's CSRF token and throws an IntrusionException if it is missing.

    • Method Detail

      • addCookie

        void addCookie​(javax.servlet.http.HttpServletResponse response,
               javax.servlet.http.Cookie cookie)
        Add a cookie to the response after ensuring that there are no encoded or illegal characters in the name and name and value. This method also sets the secure and HttpOnly flags on the cookie.
        Parameters:
        response - The HTTP response to add the cookie to
        cookie - The cookie to add

      • addCSRFToken

        java.lang.String addCSRFToken​(java.lang.String href)
        Adds the current user's CSRF token (see User.getCSRFToken()) to the URL for purposes of preventing CSRF attacks. This method should be used on all URLs to be put into all links and forms the application generates.
        Parameters:
        href - the URL to which the CSRF token will be appended
        Returns:
        the updated URL with the CSRF token parameter added

      • addHeader

        void addHeader​(javax.servlet.http.HttpServletResponse response,
               java.lang.String name,
               java.lang.String value)
        Add a header to the response after ensuring that there are no encoded or illegal characters in the name and name and value. This implementation follows the following recommendation: "A recipient MAY replace any linear white space with a single SP before interpreting the field value or forwarding the message downstream." http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
        Parameters:
        name -
        value -

      • assertSecureRequest

        void assertSecureRequest​(javax.servlet.http.HttpServletRequest request)
                  throws AccessControlException
        Ensures that the request uses both SSL and POST to protect any sensitive parameters in the querystring from being sniffed, logged, bookmarked, included in referer header, etc... This method should be called for any request that contains sensitive data from a web form.
        Parameters:
        request -
        Throws:
        AccessControlException - if security constraints are not met

      • assertSecureChannel

        void assertSecureChannel​(javax.servlet.http.HttpServletRequest request)
                  throws AccessControlException
        Ensures the use of SSL to protect any sensitive parameters in the request and any sensitive data in the response. This method should be called for any request that contains sensitive data from a web form or will result in sensitive data in the response page.
        Parameters:
        request -
        Throws:
        AccessControlException - if security constraints are not met

      • changeSessionIdentifier

        javax.servlet.http.HttpSession changeSessionIdentifier​(javax.servlet.http.HttpServletRequest request)
                                                throws AuthenticationException
        Invalidate the existing session after copying all of its contents to a newly created session with a new session id. Note that this is different from logging out and creating a new session identifier that does not contain the existing session contents. Care should be taken to use this only when the existing session does not contain hazardous contents.
        Parameters:
        request -
        Returns:
        the new HttpSession with a changed id
        Throws:
        AuthenticationException - the exception

      • clearCurrent

        void clearCurrent()
        Clears the current HttpRequest and HttpResponse associated with the current thread.
        See Also:
        ESAPI.clearCurrent()

      • decryptHiddenField

        java.lang.String decryptHiddenField​(java.lang.String encrypted)
        Decrypts an encrypted hidden field value and returns the cleartext. If the field does not decrypt properly, an IntrusionException is thrown to indicate tampering.
        Parameters:
        encrypted - hidden field value to decrypt
        Returns:
        decrypted hidden field value stored as a String

      • decryptQueryString

        java.util.Map<java.lang.String,​java.lang.String> decryptQueryString​(java.lang.String encrypted)
                                                                   throws EncryptionException
        Takes an encrypted querystring and returns a Map containing the original parameters.
        Parameters:
        encrypted - the encrypted querystring to decrypt
        Returns:
        a Map object containing the decrypted querystring
        Throws:
        EncryptionException

      • decryptStateFromCookie

        java.util.Map<java.lang.String,​java.lang.String> decryptStateFromCookie​(javax.servlet.http.HttpServletRequest request)
                                                                       throws EncryptionException
        Retrieves a map of data from a cookie encrypted with encryptStateInCookie().
        Parameters:
        request -
        Returns:
        a map containing the decrypted cookie state value
        Throws:
        EncryptionException

      • encryptHiddenField

        java.lang.String encryptHiddenField​(java.lang.String value)
                             throws EncryptionException
        Encrypts a hidden field value for use in HTML.
        Parameters:
        value - the cleartext value of the hidden field
        Returns:
        the encrypted value of the hidden field
        Throws:
        EncryptionException

      • encryptQueryString

        java.lang.String encryptQueryString​(java.lang.String query)
                             throws EncryptionException
        Takes a querystring (everything after the question mark in the URL) and returns an encrypted string containing the parameters.
        Parameters:
        query - the querystring to encrypt
        Returns:
        encrypted querystring stored as a String
        Throws:
        EncryptionException

      • encryptStateInCookie

        void encryptStateInCookie​(javax.servlet.http.HttpServletResponse response,
                          java.util.Map<java.lang.String,​java.lang.String> cleartext)
                   throws EncryptionException
        Stores a Map of data in an encrypted cookie. Generally the session is a better place to store state information, as it does not expose it to the user at all. If there is a requirement not to use sessions, or the data should be stored across sessions (for a long time), the use of encrypted cookies is an effective way to prevent the exposure.
        Parameters:
        response -
        cleartext -
        Throws:
        EncryptionException

      • getCookie

        java.lang.String getCookie​(javax.servlet.http.HttpServletRequest request,
                           java.lang.String name)
                    throws ValidationException
        A safer replacement for getCookies() in HttpServletRequest that returns the canonicalized value of the named cookie after "global" validation against the general type defined in ESAPI.properties. This should not be considered a replacement for more specific validation.
        Parameters:
        request -
        name - The cookie to get
        Returns:
        the requested cookie value
        Throws:
        ValidationException

      • getCSRFToken

        java.lang.String getCSRFToken()
        Returns the current user's CSRF token. If there is no current user then return null.
        Returns:
        the current user's CSRF token

      • getCurrentRequest

        javax.servlet.http.HttpServletRequest getCurrentRequest()
        Retrieves the current HttpServletRequest
        Returns:
        the current request

      • getCurrentResponse

        javax.servlet.http.HttpServletResponse getCurrentResponse()
        Retrieves the current HttpServletResponse
        Returns:
        the current response

      • getFileUploads

        java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request)
                       throws ValidationException
        Call getFileUploads with the specified request, default upload directory, and default allowed file extensions
        Returns:
        List of new File objects from upload
        Throws:
        ValidationException - if the file fails validation

      • getFileUploads

        java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request,
                              java.io.File finalDir)
                       throws ValidationException
        Call getFileUploads with the specified request, specified upload directory, and default allowed file extensions
        Returns:
        List of new File objects from upload
        Throws:
        ValidationException - if the file fails validation

      • getFileUploads

        java.util.List getFileUploads​(javax.servlet.http.HttpServletRequest request,
                              java.io.File destinationDir,
                              java.util.List allowedExtensions)
                       throws ValidationException
        Extract uploaded files from a multipart HTTP requests. Implementations must check the content to ensure that it is safe before making a permanent copy on the local filesystem. Checks should include length and content checks, possibly virus checking, and path and name checks. Refer to the file checking methods in Validator for more information.

        This method uses getCurrentRequest() to obtain the HttpServletRequest object

        Parameters:
        request -
        Returns:
        List of new File objects from upload
        Throws:
        ValidationException - if the file fails validation

      • getHeader

        java.lang.String getHeader​(javax.servlet.http.HttpServletRequest request,
                           java.lang.String name)
                    throws ValidationException
        A safer replacement for getHeader() in HttpServletRequest that returns the canonicalized value of the named header after "global" validation against the general type defined in ESAPI.properties. This should not be considered a replacement for more specific validation.
        Parameters:
        request -
        name -
        Returns:
        the requested header value
        Throws:
        ValidationException

      • getParameter

        java.lang.String getParameter​(javax.servlet.http.HttpServletRequest request,
                              java.lang.String name)
                       throws ValidationException
        A safer replacement for getParameter() in HttpServletRequest that returns the canonicalized value of the named parameter after "global" validation against the general type defined in ESAPI.properties. This should not be considered a replacement for more specific validation.
        Parameters:
        request -
        name -
        Returns:
        the requested parameter value
        Throws:
        ValidationException

      • killAllCookies

        void killAllCookies​(javax.servlet.http.HttpServletRequest request,
                    javax.servlet.http.HttpServletResponse response)
        Kill all cookies received in the last request from the browser. Note that new cookies set by the application in this response may not be killed by this method.
        Parameters:
        request -
        response -

      • killCookie

        void killCookie​(javax.servlet.http.HttpServletRequest request,
                javax.servlet.http.HttpServletResponse response,
                java.lang.String name)
        Kills the specified cookie by setting a new cookie that expires immediately. Note that this method does not delete new cookies that are being set by the application for this response.
        Parameters:
        request -
        name -
        response -

      • logHTTPRequest

        void logHTTPRequest​(javax.servlet.http.HttpServletRequest request,
                    Logger logger)
        Format the Source IP address, URL, URL parameters, and all form parameters into a string suitable for the log file. Be careful not to log sensitive information, and consider masking with the logHTTPRequest( List parameterNamesToObfuscate ) method.
        Parameters:
        request -
        logger - the logger to write the request to

      • logHTTPRequest

        void logHTTPRequest​(javax.servlet.http.HttpServletRequest request,
                    Logger logger,
                    java.util.List parameterNamesToObfuscate)
        Format the Source IP address, URL, URL parameters, and all form parameters into a string suitable for the log file. The list of parameters to obfuscate should be specified in order to prevent sensitive information from being logged. If a null list is provided, then all parameters will be logged. If HTTP request logging is done in a central place, the parameterNamesToObfuscate could be made a configuration parameter. We include it here in case different parts of the application need to obfuscate different parameters.
        Parameters:
        request - The HTTP request to log
        logger - the logger to write the request to
        parameterNamesToObfuscate - the sensitive parameters

      • sendForward

        void sendForward​(javax.servlet.http.HttpServletRequest request,
                 javax.servlet.http.HttpServletResponse response,
                 java.lang.String location)
          throws AccessControlException,
                 javax.servlet.ServletException,
                 java.io.IOException
        This method performs a forward to any resource located inside the WEB-INF directory. Forwarding to publicly accessible resources can be dangerous, as the request will have already passed the URL based access control check. This method ensures that you can only forward to non-publicly accessible resources.
        Parameters:
        request -
        response -
        location - the URL to forward to, including parameters
        Throws:
        AccessControlException
        javax.servlet.ServletException
        java.io.IOException

      • sendRedirect

        void sendRedirect​(javax.servlet.http.HttpServletResponse response,
                  java.lang.String location)
           throws AccessControlException,
                  java.io.IOException
        This method performs a forward to any resource located inside the WEB-INF directory. Forwarding to publicly accessible resources can be dangerous, as the request will have already passed the URL based access control check. This method ensures that you can only forward to non-publicly accessible resources.
        Parameters:
        response -
        location - the URL to forward to, including parameters
        Throws:
        AccessControlException
        java.io.IOException

      • setContentType

        void setContentType​(javax.servlet.http.HttpServletResponse response)
        Set the content type character encoding header on every HttpServletResponse in order to limit the ways in which the input data can be represented. This prevents malicious users from using encoding and multi-byte escape sequences to bypass input validation routines.

        Implementations of this method should set the content type header to a safe value for your environment. The default is text/html; charset=UTF-8 character encoding, which is the default in early versions of HTML and HTTP. See RFC 2047 (http://ds.internic.net/rfc/rfc2045.txt) for more information about character encoding and MIME.

        The DefaultHTTPUtilities reference implementation sets the content type as specified.

        Parameters:
        response - The servlet response to set the content type for.

      • setCurrentHTTP

        void setCurrentHTTP​(javax.servlet.http.HttpServletRequest request,
                    javax.servlet.http.HttpServletResponse response)
        Stores the current HttpRequest and HttpResponse so that they may be readily accessed throughout ESAPI (and elsewhere)
        Parameters:
        request - the current request
        response - the current response

      • setHeader

        void setHeader​(javax.servlet.http.HttpServletResponse response,
               java.lang.String name,
               java.lang.String value)
        Add a header to the response after ensuring that there are no encoded or illegal characters in the name and value. "A recipient MAY replace any linear white space with a single SP before interpreting the field value or forwarding the message downstream." http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
        Parameters:
        name -
        value -

      • setRememberToken

        @Deprecated
java.lang.String setRememberToken​(java.lang.String password,
                                  int maxAge,
                                  java.lang.String domain,
                                  java.lang.String path)
        Deprecated.
        Calls setNoCacheHeaders with the *current* response. ~DEPRECATED~ Per Kevin Wall, storing passwords with reversible encryption is contrary to *many* company's stated security policies.
        See Also:
        setCurrentHTTP(HttpServletRequest, HttpServletResponse)

      • setRememberToken

        java.lang.String setRememberToken​(javax.servlet.http.HttpServletRequest request,
                                  javax.servlet.http.HttpServletResponse response,
                                  int maxAge,
                                  java.lang.String domain,
                                  java.lang.String path)

      • setRememberToken

        @Deprecated
java.lang.String setRememberToken​(javax.servlet.http.HttpServletRequest request,
                                  javax.servlet.http.HttpServletResponse response,
                                  java.lang.String password,
                                  int maxAge,
                                  java.lang.String domain,
                                  java.lang.String path)
        Deprecated.
        Set a cookie containing the current User's remember me token for automatic authentication. The use of remember me tokens is generally not recommended, but this method will help do it as safely as possible. The user interface should strongly warn the user that this should only be enabled on computers where no other users will have access.

        Implementations should save the user's remember me data in an encrypted cookie and send it to the user. Any old remember me cookie should be destroyed first. Setting this cookie should keep the user logged in until the maxAge passes, the password is changed, or the cookie is deleted. If the cookie exists for the current user, it should automatically be used by ESAPI to log the user in, if the data is valid and not expired.

        The ESAPI reference implementation, DefaultHTTPUtilities.setRememberToken() implements all these suggestions.

        The username can be retrieved with: User username = ESAPI.authenticator().getCurrentUser(); ~DEPRECATED~ Per Kevin Wall, storing passwords with reversible encryption is contrary to *many* company's stated security policies.

        Parameters:
        request -
        password - the user's password
        response -
        maxAge - the length of time that the token should be valid for in relative seconds
        domain - the domain to restrict the token to or null
        path - the path to restrict the token to or null
        Returns:
        encrypted "Remember Me" token stored as a String

      • verifyCSRFToken

        void verifyCSRFToken​(javax.servlet.http.HttpServletRequest request)
              throws IntrusionException
        Checks the CSRF token in the URL (see User.getCSRFToken()) against the user's CSRF token and throws an IntrusionException if it is missing.
        Parameters:
        request -
        Throws:
        IntrusionException - if CSRF token is missing or incorrect

      • getSessionAttribute

        <T> T getSessionAttribute​(java.lang.String key)
        Gets a typed attribute from the session associated with the calling thread. If the object referenced by the passed in key is not of the implied type, a ClassCastException will be thrown to the calling code.
        Parameters:
        key - The key that references the session attribute
        Returns:
        The requested object.
        See Also:
        getSessionAttribute(javax.servlet.http.HttpSession, String)

      • getSessionAttribute

        <T> T getSessionAttribute​(javax.servlet.http.HttpSession session,
                          java.lang.String key)
        Gets a typed attribute from the passed in session. This method has the same responsibility as {link #getSessionAttribute(String} however it only references the passed in session and thus performs slightly better since it does not need to return to the Thread to get the HttpSession associated with the current thread.
        Parameters:
        session - The session to retrieve the attribute from
        key - The key that references the requested object
        Returns:
        The requested object

      • getRequestAttribute

        <T> T getRequestAttribute​(java.lang.String key)
        Gets a typed attribute from the HttpServletRequest associated with the caller thread. If the attribute on the request is not of the implied type, a ClassCastException will be thrown back to the caller.
        Parameters:
        key - The key that references the request attribute.
        Returns:
        The requested object

      • getRequestAttribute

        <T> T getRequestAttribute​(javax.servlet.http.HttpServletRequest request,
                          java.lang.String key)
        Gets a typed attribute from the HttpServletRequest associated with the passed in request. If the attribute on the request is not of the implied type, a ClassCastException will be thrown back to the caller.
        Parameters:
        request - The request to retrieve the attribute from
        key - The key that references the request attribute.
        Returns:
        The requested object