org.apache.shiro.web.util
Class WebUtils

java.lang.Object
  extended by org.apache.shiro.web.util.WebUtils

public class WebUtils
extends Object

Simple utility class for operations used across multiple class hierarchies in the web framework code.

Some methods in this class were copied from the Spring Framework so we didn't have to re-invent the wheel, and in these cases, we have retained all license, copyright and author information.

Since:
0.9

Field Summary
static String DEFAULT_CHARACTER_ENCODING
          Default character encoding to use when request.getCharacterEncoding returns null, according to the Servlet spec.
static String FORWARD_CONTEXT_PATH_ATTRIBUTE
           
static String FORWARD_PATH_INFO_ATTRIBUTE
           
static String FORWARD_QUERY_STRING_ATTRIBUTE
           
static String FORWARD_REQUEST_URI_ATTRIBUTE
          Standard Servlet 2.4+ spec request attributes for forward URI and paths.
static String FORWARD_SERVLET_PATH_ATTRIBUTE
           
static String INCLUDE_CONTEXT_PATH_ATTRIBUTE
           
static String INCLUDE_PATH_INFO_ATTRIBUTE
           
static String INCLUDE_QUERY_STRING_ATTRIBUTE
           
static String INCLUDE_REQUEST_URI_ATTRIBUTE
          Standard Servlet 2.3+ spec request attributes for include URI and paths.
static String INCLUDE_SERVLET_PATH_ATTRIBUTE
           
static String SAVED_REQUEST_KEY
          Session key used to save a request and later restore it, for example when redirecting to a requested page after login, equal to shiroSavedRequest.
static String SERVLET_REQUEST_KEY
           
static String SERVLET_RESPONSE_KEY
           
 
Constructor Summary
WebUtils()
           
 
Method Summary
static boolean _isSessionCreationEnabled(Object requestPairSource)
          Returns true if a session is allowed to be created for a subject-associated request, false otherwise.
static boolean _isSessionCreationEnabled(ServletRequest request)
          Returns true if a session is allowed to be created for a subject-associated request, false otherwise.
static String decodeRequestString(HttpServletRequest request, String source)
          Decode the given source string with a URLDecoder.
protected static String determineEncoding(HttpServletRequest request)
          Determine the encoding for the given request.
static SavedRequest getAndClearSavedRequest(ServletRequest request)
           
static String getCleanParam(ServletRequest request, String paramName)
          Convenience method that returns a request parameter value, first running it through StringUtils.clean(String).
static String getContextPath(HttpServletRequest request)
          Return the context path for the given request, detecting an include request URL if called within a RequestDispatcher include.
static HttpServletRequest getHttpRequest(Object requestPairSource)
           
static HttpServletResponse getHttpResponse(Object requestPairSource)
           
static String getPathWithinApplication(HttpServletRequest request)
          Return the path within the web application for the given request.
static ServletRequest getRequest(Object requestPairSource)
           
static String getRequestUri(HttpServletRequest request)
          Return the request URI for the given request, detecting an include request URL if called within a RequestDispatcher include.
static WebEnvironment getRequiredWebEnvironment(ServletContext sc)
          Find the Shiro WebEnvironment for this web application, which is typically loaded via the EnvironmentLoaderListener.
static ServletResponse getResponse(Object requestPairSource)
           
static SavedRequest getSavedRequest(ServletRequest request)
           
static WebEnvironment getWebEnvironment(ServletContext sc)
          Find the Shiro WebEnvironment for this web application, which is typically loaded via EnvironmentLoaderListener.
static WebEnvironment getWebEnvironment(ServletContext sc, String attrName)
          Find the Shiro WebEnvironment for this web application.
static boolean isHttp(Object requestPairSource)
           
static void issueRedirect(ServletRequest request, ServletResponse response, String url)
          Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.
static void issueRedirect(ServletRequest request, ServletResponse response, String url, Map queryParams)
          Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.
static void issueRedirect(ServletRequest request, ServletResponse response, String url, Map queryParams, boolean contextRelative)
          Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.
static void issueRedirect(ServletRequest request, ServletResponse response, String url, Map queryParams, boolean contextRelative, boolean http10Compatible)
          Redirects the current request to a new URL based on the given parameters.
static boolean isTrue(ServletRequest request, String paramName)
          Checks to see if a request param is considered true using a loose matching strategy for general values that indicate that something is true or enabled, etc.
static boolean isWeb(Object requestPairSource)
           
static String normalize(String path)
          Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it.
static void redirectToSavedRequest(ServletRequest request, ServletResponse response, String fallbackUrl)
          Redirects the to the request url from a previously saved request, or if there is no saved request, redirects the end user to the specified fallbackUrl.
static void saveRequest(ServletRequest request)
           
static HttpServletRequest toHttp(ServletRequest request)
          A convenience method that merely casts the incoming ServletRequest to an HttpServletRequest:

return (HttpServletRequest)request;

Logic could be changed in the future for logging or throwing an meaningful exception in non HTTP request environments (e.g.

static HttpServletResponse toHttp(ServletResponse response)
          A convenience method that merely casts the incoming ServletResponse to an HttpServletResponse:

return (HttpServletResponse)response;

Logic could be changed in the future for logging or throwing an meaningful exception in non HTTP request environments (e.g.

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

Field Detail

SERVLET_REQUEST_KEY

public static final String SERVLET_REQUEST_KEY

SERVLET_RESPONSE_KEY

public static final String SERVLET_RESPONSE_KEY

SAVED_REQUEST_KEY

public static final String SAVED_REQUEST_KEY
Session key used to save a request and later restore it, for example when redirecting to a requested page after login, equal to shiroSavedRequest.

See Also:
Constant Field Values

INCLUDE_REQUEST_URI_ATTRIBUTE

public static final String INCLUDE_REQUEST_URI_ATTRIBUTE
Standard Servlet 2.3+ spec request attributes for include URI and paths.

If included via a RequestDispatcher, the current resource will see the originating request. Its own URI and paths are exposed as request attributes.

See Also:
Constant Field Values

INCLUDE_CONTEXT_PATH_ATTRIBUTE

public static final String INCLUDE_CONTEXT_PATH_ATTRIBUTE
See Also:
Constant Field Values

INCLUDE_SERVLET_PATH_ATTRIBUTE

public static final String INCLUDE_SERVLET_PATH_ATTRIBUTE
See Also:
Constant Field Values

INCLUDE_PATH_INFO_ATTRIBUTE

public static final String INCLUDE_PATH_INFO_ATTRIBUTE
See Also:
Constant Field Values

INCLUDE_QUERY_STRING_ATTRIBUTE

public static final String INCLUDE_QUERY_STRING_ATTRIBUTE
See Also:
Constant Field Values

FORWARD_REQUEST_URI_ATTRIBUTE

public static final String FORWARD_REQUEST_URI_ATTRIBUTE
Standard Servlet 2.4+ spec request attributes for forward URI and paths.

If forwarded to via a RequestDispatcher, the current resource will see its own URI and paths. The originating URI and paths are exposed as request attributes.

See Also:
Constant Field Values

FORWARD_CONTEXT_PATH_ATTRIBUTE

public static final String FORWARD_CONTEXT_PATH_ATTRIBUTE
See Also:
Constant Field Values

FORWARD_SERVLET_PATH_ATTRIBUTE

public static final String FORWARD_SERVLET_PATH_ATTRIBUTE
See Also:
Constant Field Values

FORWARD_PATH_INFO_ATTRIBUTE

public static final String FORWARD_PATH_INFO_ATTRIBUTE
See Also:
Constant Field Values

FORWARD_QUERY_STRING_ATTRIBUTE

public static final String FORWARD_QUERY_STRING_ATTRIBUTE
See Also:
Constant Field Values

DEFAULT_CHARACTER_ENCODING

public static final String DEFAULT_CHARACTER_ENCODING
Default character encoding to use when request.getCharacterEncoding returns null, according to the Servlet spec.

See Also:
ServletRequest.getCharacterEncoding(), Constant Field Values
Constructor Detail

WebUtils

public WebUtils()
Method Detail

getPathWithinApplication

public static String getPathWithinApplication(HttpServletRequest request)
Return the path within the web application for the given request. Detects include request URL if called within a RequestDispatcher include.

For example, for a request to URL

http://www.somehost.com/myapp/my/url.jsp,

for an application deployed to /mayapp (the application's context path), this method would return

/my/url.jsp.

Parameters:
request - current HTTP request
Returns:
the path within the web application

getRequestUri

public static String getRequestUri(HttpServletRequest request)
Return the request URI for the given request, detecting an include request URL if called within a RequestDispatcher include.

As the value returned by request.getRequestURI() is not decoded by the servlet container, this method will decode it.

The URI that the web container resolves should be correct, but some containers like JBoss/Jetty incorrectly include ";" strings like ";jsessionid" in the URI. This method cuts off such incorrect appendices.

Parameters:
request - current HTTP request
Returns:
the request URI

normalize

public static String normalize(String path)
Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it. WARNING - This method is useful only for normalizing application-generated paths. It does not try to perform security checks for malicious input. Normalize operations were was happily taken from org.apache.catalina.util.RequestUtil in Tomcat trunk, r939305

Parameters:
path - Relative path to be normalized
Returns:
normalized path

getContextPath

public static String getContextPath(HttpServletRequest request)
Return the context path for the given request, detecting an include request URL if called within a RequestDispatcher include.

As the value returned by request.getContextPath() is not decoded by the servlet container, this method will decode it.

Parameters:
request - current HTTP request
Returns:
the context path

getRequiredWebEnvironment

public static WebEnvironment getRequiredWebEnvironment(ServletContext sc)
                                                throws IllegalStateException
Find the Shiro WebEnvironment for this web application, which is typically loaded via the EnvironmentLoaderListener.

This implementation rethrows an exception that happened on environment startup to differentiate between a failed environment startup and no environment at all.

Parameters:
sc - ServletContext to find the web application context for
Returns:
the root WebApplicationContext for this web app
Throws:
IllegalStateException - if the root WebApplicationContext could not be found
Since:
1.2
See Also:
EnvironmentLoader.ENVIRONMENT_ATTRIBUTE_KEY

getWebEnvironment

public static WebEnvironment getWebEnvironment(ServletContext sc)
Find the Shiro WebEnvironment for this web application, which is typically loaded via EnvironmentLoaderListener.

This implementation rethrows an exception that happened on environment startup to differentiate between a failed environment startup and no environment at all.

Parameters:
sc - ServletContext to find the web application context for
Returns:
the root WebApplicationContext for this web app, or null if none
Since:
1.2
See Also:
EnvironmentLoader.ENVIRONMENT_ATTRIBUTE_KEY

getWebEnvironment

public static WebEnvironment getWebEnvironment(ServletContext sc,
                                               String attrName)
Find the Shiro WebEnvironment for this web application.

Parameters:
sc - ServletContext to find the web application context for
attrName - the name of the ServletContext attribute to look for
Returns:
the desired WebEnvironment for this web app, or null if none
Since:
1.2

decodeRequestString

public static String decodeRequestString(HttpServletRequest request,
                                         String source)
Decode the given source string with a URLDecoder. The encoding will be taken from the request, falling back to the default "ISO-8859-1".

The default implementation uses URLDecoder.decode(input, enc).

Parameters:
request - current HTTP request
source - the String to decode
Returns:
the decoded String
See Also:
DEFAULT_CHARACTER_ENCODING, ServletRequest.getCharacterEncoding(), URLDecoder.decode(String, String), URLDecoder.decode(String)

determineEncoding

protected static String determineEncoding(HttpServletRequest request)
Determine the encoding for the given request. Can be overridden in subclasses.

The default implementation checks the request's character encoding, and if that null, falls back to the DEFAULT_CHARACTER_ENCODING.

Parameters:
request - current HTTP request
Returns:
the encoding for the request (never null)
See Also:
ServletRequest.getCharacterEncoding()

isWeb

public static boolean isWeb(Object requestPairSource)

isHttp

public static boolean isHttp(Object requestPairSource)

getRequest

public static ServletRequest getRequest(Object requestPairSource)

getResponse

public static ServletResponse getResponse(Object requestPairSource)

getHttpRequest

public static HttpServletRequest getHttpRequest(Object requestPairSource)

getHttpResponse

public static HttpServletResponse getHttpResponse(Object requestPairSource)

_isSessionCreationEnabled

public static boolean _isSessionCreationEnabled(Object requestPairSource)
Returns true if a session is allowed to be created for a subject-associated request, false otherwise.

This method exists for Shiro's internal framework needs and should never be called by Shiro end-users. It could be changed/removed at any time.

Parameters:
requestPairSource - a RequestPairSource instance, almost always a WebSubject instance.
Returns:
true if a session is allowed to be created for a subject-associated request, false otherwise.

_isSessionCreationEnabled

public static boolean _isSessionCreationEnabled(ServletRequest request)
Returns true if a session is allowed to be created for a subject-associated request, false otherwise.

This method exists for Shiro's internal framework needs and should never be called by Shiro end-users. It could be changed/removed at any time.

Parameters:
request - incoming servlet request.
Returns:
true if a session is allowed to be created for a subject-associated request, false otherwise.

toHttp

public static HttpServletRequest toHttp(ServletRequest request)
A convenience method that merely casts the incoming ServletRequest to an HttpServletRequest:

return (HttpServletRequest)request;

Logic could be changed in the future for logging or throwing an meaningful exception in non HTTP request environments (e.g. Portlet API).

Parameters:
request - the incoming ServletRequest
Returns:
the request argument casted to an HttpServletRequest.

toHttp

public static HttpServletResponse toHttp(ServletResponse response)
A convenience method that merely casts the incoming ServletResponse to an HttpServletResponse:

return (HttpServletResponse)response;

Logic could be changed in the future for logging or throwing an meaningful exception in non HTTP request environments (e.g. Portlet API).

Parameters:
response - the outgoing ServletResponse
Returns:
the response argument casted to an HttpServletResponse.

issueRedirect

public static void issueRedirect(ServletRequest request,
                                 ServletResponse response,
                                 String url,
                                 Map queryParams,
                                 boolean contextRelative,
                                 boolean http10Compatible)
                          throws IOException
Redirects the current request to a new URL based on the given parameters.

Parameters:
request - the servlet request.
response - the servlet response.
url - the URL to redirect the user to.
queryParams - a map of parameters that should be set as request parameters for the new request.
contextRelative - true if the URL is relative to the servlet context path, or false if the URL is absolute.
http10Compatible - whether to stay compatible with HTTP 1.0 clients.
Throws:
IOException - if thrown by response methods.

issueRedirect

public static void issueRedirect(ServletRequest request,
                                 ServletResponse response,
                                 String url)
                          throws IOException
Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.

Parameters:
request - the servlet request.
response - the servlet response.
url - the URL to redirect the user to.
Throws:
IOException - if thrown by response methods.

issueRedirect

public static void issueRedirect(ServletRequest request,
                                 ServletResponse response,
                                 String url,
                                 Map queryParams)
                          throws IOException
Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.

Parameters:
request - the servlet request.
response - the servlet response.
url - the URL to redirect the user to.
queryParams - a map of parameters that should be set as request parameters for the new request.
Throws:
IOException - if thrown by response methods.

issueRedirect

public static void issueRedirect(ServletRequest request,
                                 ServletResponse response,
                                 String url,
                                 Map queryParams,
                                 boolean contextRelative)
                          throws IOException
Redirects the current request to a new URL based on the given parameters and default values for unspecified parameters.

Parameters:
request - the servlet request.
response - the servlet response.
url - the URL to redirect the user to.
queryParams - a map of parameters that should be set as request parameters for the new request.
contextRelative - true if the URL is relative to the servlet context path, or false if the URL is absolute.
Throws:
IOException - if thrown by response methods.

isTrue

public static boolean isTrue(ServletRequest request,
                             String paramName)

Checks to see if a request param is considered true using a loose matching strategy for general values that indicate that something is true or enabled, etc.

Values that are considered "true" include (case-insensitive): true, t, 1, enabled, y, yes, on.

Parameters:
request - the servlet request
paramName - @return true if the param value is considered true or false if it isn't.
Returns:
true if the given parameter is considered "true" - false otherwise.

getCleanParam

public static String getCleanParam(ServletRequest request,
                                   String paramName)
Convenience method that returns a request parameter value, first running it through StringUtils.clean(String).

Parameters:
request - the servlet request.
paramName - the parameter name.
Returns:
the clean param value, or null if the param does not exist or is empty.

saveRequest

public static void saveRequest(ServletRequest request)

getAndClearSavedRequest

public static SavedRequest getAndClearSavedRequest(ServletRequest request)

getSavedRequest

public static SavedRequest getSavedRequest(ServletRequest request)

redirectToSavedRequest

public static void redirectToSavedRequest(ServletRequest request,
                                          ServletResponse response,
                                          String fallbackUrl)
                                   throws IOException
Redirects the to the request url from a previously saved request, or if there is no saved request, redirects the end user to the specified fallbackUrl. If there is no saved request or fallback url, this method throws an IllegalStateException.

This method is primarily used to support a common login scenario - if an unauthenticated user accesses a page that requires authentication, it is expected that request is saved first and then redirected to the login page. Then, after a successful login, this method can be called to redirect them back to their originally requested URL, a nice usability feature.

Parameters:
request - the incoming request
response - the outgoing response
fallbackUrl - the fallback url to redirect to if there is no saved request available.
Throws:
IllegalStateException - if there is no saved request and the fallbackUrl is null.
IOException - if there is an error redirecting
Since:
1.0


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