HTTPUtilities (ESAPI 2.1.0 API)

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

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`COOKIE`
`static String`	`CSRF_TOKEN_NAME`
`static String`	`ESAPI_STATE`
`static int`	`HEADER`
`static int`	`MAX_COOKIE_LEN`
`static int`	`MAX_COOKIE_PAIRS`
`static int`	`PARAMETER`
`static String`	`REMEMBER_TOKEN_COOKIE_NAME`

Method Summary

Methods
Modifier and Type	Method and 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.
`String`	`addCSRFToken(String href)` Adds the current user's CSRF token (see User.getCSRFToken()) to the URL for purposes of preventing CSRF attacks.
`void`	`addHeader(javax.servlet.http.HttpServletResponse response, String name, 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`	`addHeader(String name, String value)` Calls addHeader with the current request.
`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.
`String`	`decryptHiddenField(String encrypted)` Decrypts an encrypted hidden field value and returns the cleartext.
`Map<String,String>`	`decryptQueryString(String encrypted)` Takes an encrypted querystring and returns a Map containing the original parameters.
`Map<String,String>`	`decryptStateFromCookie()` Calls decryptStateFromCookie with the current request.
`Map<String,String>`	`decryptStateFromCookie(javax.servlet.http.HttpServletRequest request)` Retrieves a map of data from a cookie encrypted with encryptStateInCookie().
`String`	`encryptHiddenField(String value)` Encrypts a hidden field value for use in HTML.
`String`	`encryptQueryString(String query)` Takes a querystring (everything after the question mark in the URL) and returns an encrypted string containing the parameters.
`void`	`encryptStateInCookie(javax.servlet.http.HttpServletResponse response, Map<String,String> cleartext)` Stores a Map of data in an encrypted cookie.
`void`	`encryptStateInCookie(Map<String,String> cleartext)` Calls encryptStateInCookie with the current response.
`String`	`getCookie(javax.servlet.http.HttpServletRequest request, 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.
`String`	`getCookie(String name)` Calls getCookie with the current response.
`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
`List`	`getFileUploads()` Calls getFileUploads with the current request, default upload directory, and default allowed file extensions
`List`	`getFileUploads(javax.servlet.http.HttpServletRequest request)` Call getFileUploads with the specified request, default upload directory, and default allowed file extensions
`List`	`getFileUploads(javax.servlet.http.HttpServletRequest request, File finalDir)` Call getFileUploads with the specified request, specified upload directory, and default allowed file extensions
`List`	`getFileUploads(javax.servlet.http.HttpServletRequest request, File destinationDir, List allowedExtensions)` Extract uploaded files from a multipart HTTP requests.
`String`	`getHeader(javax.servlet.http.HttpServletRequest request, 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.
`String`	`getHeader(String name)` Calls getHeader with the current request.
`String`	`getParameter(javax.servlet.http.HttpServletRequest request, 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.
`String`	`getParameter(String name)` Calls getParameter with the current request.
`<T> T`	`getRequestAttribute(javax.servlet.http.HttpServletRequest request, String key)` Gets a typed attribute from the `HttpServletRequest` associated with the passed in request.
`<T> T`	`getRequestAttribute(String key)` Gets a typed attribute from the `HttpServletRequest` associated with the caller thread.
`<T> T`	`getSessionAttribute(javax.servlet.http.HttpSession session, String key)` Gets a typed attribute from the passed in session.
`<T> T`	`getSessionAttribute(String key)` Gets a typed attribute from the session associated with the calling thread.
`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(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String name)` Kills the specified cookie by setting a new cookie that expires immediately.
`void`	`killCookie(String name)` Calls killCookie with the current request and response.
`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, List parameterNamesToObfuscate)` Format the Source IP address, URL, URL parameters, and all form parameters into a string suitable for the log file.
`void`	`sendForward(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String location)` This method performs a forward to any resource located inside the WEB-INF directory.
`void`	`sendForward(String location)` Calls sendForward with the current request and response.
`void`	`sendRedirect(javax.servlet.http.HttpServletResponse response, String location)` This method performs a forward to any resource located inside the WEB-INF directory.
`void`	`sendRedirect(String location)` Calls sendRedirect with the current response.
`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(javax.servlet.http.HttpServletResponse response, String name, String value)` Add a header to the response after ensuring that there are no encoded or illegal characters in the name and value.
`void`	`setHeader(String name, String value)` Calls setHeader with the current response.
`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.
`String`	`setRememberToken(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String password, int maxAge, String domain, String path)` Set a cookie containing the current User's remember me token for automatic authentication.
`String`	`setRememberToken(String password, int maxAge, String domain, String path)` Calls setNoCacheHeaders with the current response.
`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.

- Field Detail
  - REMEMBER_TOKEN_COOKIE_NAME
```
static final String REMEMBER_TOKEN_COOKIE_NAME
```
    See Also:
    Constant Field Values
  - MAX_COOKIE_LEN
```
static final int MAX_COOKIE_LEN
```
    See Also:
    Constant Field Values
  - MAX_COOKIE_PAIRS
```
static final int MAX_COOKIE_PAIRS
```
    See Also:
    Constant Field Values
  - CSRF_TOKEN_NAME
```
static final String CSRF_TOKEN_NAME
```
    See Also:
    Constant Field Values
  - ESAPI_STATE
```
static final String ESAPI_STATE
```
    See Also:
    Constant Field Values
  - PARAMETER
```
static final int PARAMETER
```
    See Also:
    Constant Field Values
  - HEADER
```
static final int HEADER
```
    See Also:
    Constant Field Values
  - COOKIE
```
static final int COOKIE
```
    See Also:
    Constant Field Values
- Method Detail
  - addCookie
```
void addCookie(javax.servlet.http.Cookie cookie)
```
    Calls addCookie with the *current* request.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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:
    cookie -
  - addCSRFToken
```
String addCSRFToken(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(String name,
             String value)
```
    Calls addHeader with the *current* request.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - addHeader
```
void addHeader(javax.servlet.http.HttpServletResponse response,
             String name,
             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()
                         throws AccessControlException
```
    Calls assertSecureRequest with the *current* request.
    
    Throws:
    
    AccessControlException
    See Also:
    HTTPUtilities#assertSecureRequest(HttpServletRequest)}, HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - assertSecureChannel
```
void assertSecureChannel()
                         throws AccessControlException
```
    Calls assertSecureChannel with the *current* request.
    
    Throws:
    
    AccessControlException
    See Also:
    HTTPUtilities#assertSecureChannel(HttpServletRequest)}, HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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()
                                                       throws AuthenticationException
```
    Calls changeSessionIdentifier with the *current* request.
    
    Throws:
    
    AuthenticationException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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
```
String decryptHiddenField(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
```
Map<String,String> decryptQueryString(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
```
Map<String,String> decryptStateFromCookie()
                                          throws EncryptionException
```
    Calls decryptStateFromCookie with the *current* request.
    
    Throws:
    
    EncryptionException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - decryptStateFromCookie
```
Map<String,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
```
String encryptHiddenField(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
```
String encryptQueryString(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(Map<String,String> cleartext)
                          throws EncryptionException
```
    Calls encryptStateInCookie with the *current* response.
    
    Throws:
    
    EncryptionException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - encryptStateInCookie
```
void encryptStateInCookie(javax.servlet.http.HttpServletResponse response,
                        Map<String,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
```
String getCookie(String name)
                 throws ValidationException
```
    Calls getCookie with the *current* response.
    
    Throws:
    
    ValidationException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - getCookie
```
String getCookie(javax.servlet.http.HttpServletRequest request,
               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 -
    
    Returns:
    the requested cookie value
    
    Throws:
    
    ValidationException
  - getCSRFToken
```
String getCSRFToken()
```
    Returns the current user's CSRF token. If there is no current user then return null.
    
    Returns:
    the current users 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
```
List getFileUploads()
                    throws ValidationException
```
    Calls getFileUploads with the *current* request, default upload directory, and default allowed file extensions
    
    Throws:
    
    ValidationException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - getFileUploads
```
List getFileUploads(javax.servlet.http.HttpServletRequest request)
                    throws ValidationException
```
    Call getFileUploads with the specified request, default upload directory, and default allowed file extensions
    
    Throws:
    
    ValidationException
  - getFileUploads
```
List getFileUploads(javax.servlet.http.HttpServletRequest request,
                  File finalDir)
                    throws ValidationException
```
    Call getFileUploads with the specified request, specified upload directory, and default allowed file extensions
    
    Throws:
    
    ValidationException
  - getFileUploads
```
List getFileUploads(javax.servlet.http.HttpServletRequest request,
                  File destinationDir,
                  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
```
String getHeader(String name)
                 throws ValidationException
```
    Calls getHeader with the *current* request.
    
    Throws:
    
    ValidationException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - getHeader
```
String getHeader(javax.servlet.http.HttpServletRequest request,
               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
```
String getParameter(String name)
                    throws ValidationException
```
    Calls getParameter with the *current* request.
    
    Throws:
    
    ValidationException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - getParameter
```
String getParameter(javax.servlet.http.HttpServletRequest request,
                  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()
```
    Calls killAllCookies with the *current* request and response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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(String name)
```
    Calls killCookie with the *current* request and response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - killCookie
```
void killCookie(javax.servlet.http.HttpServletRequest request,
              javax.servlet.http.HttpServletResponse response,
              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()
```
    Calls logHTTPRequest with the *current* request and logger.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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,
                  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 -
    logger - the logger to write the request to
    parameterNamesToObfuscate - the sensitive parameters
  - sendForward
```
void sendForward(String location)
                 throws AccessControlException,
                        javax.servlet.ServletException,
                        IOException
```
    Calls sendForward with the *current* request and response.
    
    Throws:
    
    AccessControlException
    
    javax.servlet.ServletException
    
    IOException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - sendForward
```
void sendForward(javax.servlet.http.HttpServletRequest request,
               javax.servlet.http.HttpServletResponse response,
               String location)
                 throws AccessControlException,
                        javax.servlet.ServletException,
                        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
    
    IOException
  - sendRedirect
```
void sendRedirect(String location)
                  throws AccessControlException,
                         IOException
```
    Calls sendRedirect with the *current* response.
    
    Throws:
    
    AccessControlException
    
    IOException
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - sendRedirect
```
void sendRedirect(javax.servlet.http.HttpServletResponse response,
                String location)
                  throws AccessControlException,
                         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
    
    javax.servlet.ServletException
    
    IOException
  - setContentType
```
void setContentType()
```
    Calls setContentType with the *current* request and response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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(String name,
             String value)
```
    Calls setHeader with the *current* response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - setHeader
```
void setHeader(javax.servlet.http.HttpServletResponse response,
             String name,
             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 -
  - setNoCacheHeaders
```
void setNoCacheHeaders()
```
    Calls setNoCacheHeaders with the *current* response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - setNoCacheHeaders
```
void setNoCacheHeaders(javax.servlet.http.HttpServletResponse response)
```
    Set headers to protect sensitive information against being cached in the browser. Developers should make this call for any HTTP responses that contain any sensitive data that should not be cached within the browser or any intermediate proxies or caches. Implementations should set headers for the expected browsers. The safest approach is to set all relevant headers to their most restrictive setting. These include:
```
 Cache-Control: no-store

 Cache-Control: no-cache

 Cache-Control: must-revalidate

 Expires: -1

 
```
    Note that the header "pragma: no-cache" is intended only for use in HTTP requests, not HTTP responses. However, Microsoft has chosen to directly violate the standards, so we need to include that header here. For more information, please refer to the relevant standards:
    Parameters:
    response -
  - setRememberToken
```
String setRememberToken(String password,
                      int maxAge,
                      String domain,
                      String path)
```
    Calls setNoCacheHeaders with the *current* response.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - setRememberToken
```
String setRememberToken(javax.servlet.http.HttpServletRequest request,
                      javax.servlet.http.HttpServletResponse response,
                      String password,
                      int maxAge,
                      String domain,
                      String path)
```
    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();
    
    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()
```
    Calls verifyCSRFToken with the *current* request.
    
    See Also:
    HTTPUtilities#setCurrentHTTP(HttpServletRequest, HttpServletResponse)}
  - 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(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.
    
    Type Parameters:
    T - The implied type of object expected.
    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,
                        String key)
```
    Gets a typed attribute from the passed in session. This method has the same responsibility as {link #getSessionAttribute(String} however only it 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.
    
    Type Parameters:
    T - The implied type of object expected
    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(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.
    
    Type Parameters:
    T - The implied type of the object expected
    Parameters:
    key - The key that references the request attribute.
    
    Returns:
    The requested object
  - getRequestAttribute
```
<T> T getRequestAttribute(javax.servlet.http.HttpServletRequest request,
                        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.
    
    Type Parameters:
    T - The implied type of the object expected
    Parameters:
    request - The request to retrieve the attribute from
    key - The key that references the request attribute.
    
    Returns:
    The requested object

Interface HTTPUtilities

Field Summary

Method Summary

Field Detail

REMEMBER_TOKEN_COOKIE_NAME

MAX_COOKIE_LEN

MAX_COOKIE_PAIRS

CSRF_TOKEN_NAME

ESAPI_STATE

PARAMETER

HEADER

COOKIE

Method Detail

addCookie

addCookie

addCSRFToken

addHeader

addHeader

assertSecureRequest

assertSecureChannel

assertSecureRequest

assertSecureChannel

changeSessionIdentifier

changeSessionIdentifier

clearCurrent

decryptHiddenField

decryptQueryString

decryptStateFromCookie

decryptStateFromCookie

encryptHiddenField

encryptQueryString

encryptStateInCookie

encryptStateInCookie

getCookie

getCookie

getCSRFToken

getCurrentRequest

getCurrentResponse

getFileUploads

getFileUploads

getFileUploads

getFileUploads

getHeader

getHeader

getParameter

getParameter

killAllCookies

killAllCookies

killCookie

killCookie

logHTTPRequest

logHTTPRequest

logHTTPRequest

sendForward

sendForward

sendRedirect

sendRedirect

setContentType

setContentType

setCurrentHTTP

setHeader

setHeader

setNoCacheHeaders

setNoCacheHeaders

setRememberToken

setRememberToken

verifyCSRFToken

verifyCSRFToken

getSessionAttribute

getSessionAttribute

getRequestAttribute

getRequestAttribute