Package com.github.adminfaces.template.util

Enum WebXml

  • All Implemented Interfaces:
    Serializable, Comparable<WebXml>
    public enum WebXml
extends Enum<WebXml>
    COPIED from OmniFaces because when users update to OmniFaces 3.x they get java.lang.IncompatibleClassChangeError: Found interface org.omnifaces.config.WebXml, but class was expected because AdminTemplate depends on OmniFaces 2.1 and the method used by template (findErrorPages) has changed in OmniFaces 3.x

    This configuration enum parses the /WEB-INF/web.xml and all /META-INF/web-fragment files found in the classpath and offers methods to obtain information from them which is not available by the standard Servlet API.

    Usage

    Some examples: 

     // Get the <welcome-file-list> (which are essentially path-relative filenames which needs to be served when a folder is requested).
 List<String> welcomeFiles = WebXml.INSTANCE.getWelcomeFiles();
 
     // Get a mapping of all error page locations by exception type (a key of null represents the default error page location, if any).
 Map<Class<Throwable>, String> errorPageLocations = WebXml.INSTANCE.getErrorPageLocations();
 
     // Get the <form-login-page> (which is a context-relative URL to the login page of FORM based authentication).
 String formLoginPage = WebXml.INSTANCE.getFormLoginPage();
 
     // Get a mapping of all <security-constraint> URL patterns and associated roles.
 Map<String, Set<String>> securityConstraints = WebXml.INSTANCE.getSecurityConstraints();
 
     // Check if access to certain (context-relative) URL is allowed for the given role based on <security-constraint>.
 boolean accessAllowed = WebXml.INSTANCE.isAccessAllowed("/admin.xhtml", "admin");
 
     // Get web.xml configured session timeout (in seconds).
 int sessionTimeout = WebXml.INSTANCE.getSessionTimeout();
    Since:
    1.2
    Author:
    Bauke Scholtz

    • Enum Constant Detail

      • INSTANCE

        public static final WebXml INSTANCE
        Returns the lazily loaded enum singleton instance.

        Note: if this is needed in e.g. a Filter which is called before the FacesServlet is invoked, then it won't work if the INSTANCE hasn't been referenced before. Since JSF installs a special "init" FacesContext during startup, one option for doing this initial referencing is in a ServletContextListener. The data this enum encapsulates will then be available even where there is no FacesContext available. If there's no other option, then you need to manually invoke init(ServletContext) whereby you pass the desired ServletContext.

    • Method Detail

      • values

        public static WebXml[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (WebXml c : WebXml.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static WebXml valueOf​(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null

      • init

        public WebXml init​(jakarta.servlet.ServletContext servletContext)
        Perform manual initialization with the given servlet context, if not null and not already initialized yet.
        Parameters:
        servletContext - The servlet context to obtain the web.xml from.
        Returns:
        The current WebXml instance, initialized and all.

      • findErrorPageLocation

        public String findErrorPageLocation​(Throwable exception)
        Find for the given exception the right error page location. Exception types are matched as per Servlet 3.0 specification 10.9.2:
        • Make a first pass through all specific exception types. If an exact match is found, use its location.
        • Else make a second pass through all specific exception types in the order as they are declared in web.xml. If the current exception is an instance of it, then use its location.
        • Else use the default error page location, which can be either the java.lang.Throwable or HTTP 500 or default one.
        Parameters:
        exception - The exception to find the error page location for.
        Returns:
        The right error page location for the given exception.

      • isAccessAllowed

        public boolean isAccessAllowed​(String url,
                               String role)
        Returns true if access to the given URL is allowed for the given role. URL patterns are matched as per Servlet 3.0 specification 12.1:
        • Make a first pass through all URL patterns. If an exact match is found, then check the role on it.
        • Else make a recursive pass through all prefix URL patterns, stepping down the URL one directory at a time, trying to find the longest path match. If it is found, then check the role on it.
        • Else if the last segment in the URL path contains an extension, then make a last pass through all suffix URL patterns. If a match is found, then check the role on it.
        • Else assume it as unprotected resource and return true.
        Parameters:
        url - URL to be checked for access by the given role. It must start with '/' and be context-relative.
        role - Role to be checked for access to the given URL.
        Returns:
        true if access to the given URL is allowed for the given role, otherwise false.
        Throws:
        NullPointerException - If given URL is null.
        IllegalArgumentException - If given URL does not start with '/'.
        Since:
        1.4

      • getWelcomeFiles

        public List<String> getWelcomeFiles()
        Returns a list of all welcome files.
        Returns:
        A list of all welcome files.
        Since:
        1.4

      • getErrorPageLocations

        public Map<Class<Throwable>,​String> getErrorPageLocations()
        Returns a mapping of all error page locations by exception type. The default location is identified by null key.
        Returns:
        A mapping of all error page locations by exception type.

      • getFormLoginPage

        public String getFormLoginPage()
        Returns the location of the FORM authentication login page, or null if it is not defined.
        Returns:
        The location of the FORM authentication login page, or null if it is not defined.

      • getFormErrorPage

        public String getFormErrorPage()
        Returns the location of the FORM authentication error page, or null if it is not defined.
        Returns:
        The location of the FORM authentication error page, or null if it is not defined.
        Since:
        1.8

      • getSecurityConstraints

        public Map<String,​Set<String>> getSecurityConstraints()
        Returns a mapping of all security constraint URL patterns and the associated roles in the declared order. If the roles is null, then it means that no auth constraint is been set (i.e. the resource is publicly accessible). If the roles is empty, then it means that an empty auth constraint is been set (i.e. the resource is in no way accessible).
        Returns:
        A mapping of all security constraint URL patterns and the associated roles in the declared order.
        Since:
        1.4

      • getSessionTimeout

        public int getSessionTimeout()
        Returns the configured session timeout in minutes, or -1 if it is not defined.
        Returns:
        The configured session timeout in minutes, or -1 if it is not defined.
        Since:
        1.7