Class ContentHelper

java.lang.Object

org.deltava.taglib.ContentHelper

public class ContentHelper
extends Object

A Helper class to check whether content has been aded into this request. This is also used as a helper to modify the dynamic Content Security Policy.

Since:

1.0

Version:

12.0

Author:

Luke

See Also:

• BrowserTypeFilter
• BrowserFilterTag
• ContentSecurityPolicy

Method Summary

Modifier and Type	Method	Description
static void	addContent(PageContext ctx, String contentType, String contentName)	Updates a request-located map of all inserted content files.
static void	addCSP(PageContext ctx, ContentSecurity cs, String... hosts)	Adds a host to the dynamic Content Security Policy.
static void	clearContent(ServletRequest req)	Clears any included content with resetting the request, like when forwarding to an error page.
static boolean	containsContent(PageContext ctx, String contentType, String contentName)	Determines if a particular content file has been inserted during this request invocation.
static void	flushCSP(PageContext ctx)	Writes a dynamic Content Security Policy header to the response.
static HTTPContextData	getBrowserContext(PageContext ctx)	Fetches the browser data.
static void	pushContent(PageContext ctx, String url, String type)	Adds an HTTP/2 preload link header to the response.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

addContent

public static void addContent(PageContext ctx,
 String contentType,
 String contentName)

Updates a request-located map of all inserted content files.

Parameters:

ctx - the JSP PageContext

contentType - the type of content (css/js)

contentName - the name of the inserted content

See Also:

• containsContent(PageContext, String, String)

containsContent

public static boolean containsContent(PageContext ctx,
 String contentType,
 String contentName)

Determines if a particular content file has been inserted during this request invocation.

Parameters:

ctx - the JSP PageContext

contentType - the type of content (css/js)

contentName - the name of the content

Returns:

TRUE if the content has been added, otherwise FALSE

See Also:

• addContent(PageContext, String, String)

clearContent

public static void clearContent(ServletRequest req)

Clears any included content with resetting the request, like when forwarding to an error page. The push content list is not cleared since the headers have already been set.

Parameters:

req - the ServletRequest

getBrowserContext

public static HTTPContextData getBrowserContext(PageContext ctx)

Fetches the browser data.

Parameters:

ctx - the PageContext object

Returns:

an HTTPContextData bean, or none if null

See Also:

• BrowserInfoTag

pushContent

public static void pushContent(PageContext ctx,
 String url,
 String type)

Adds an HTTP/2 preload link header to the response.

Parameters:

ctx - the PageContext object

url - the URL to push

type - the type of resource

addCSP

public static void addCSP(PageContext ctx,
 ContentSecurity cs,
 String... hosts)

Adds a host to the dynamic Content Security Policy.

Parameters:

ctx - the PageContext object

cs - a ContentSecurity enumeration

hosts - the host names or wildcards

flushCSP

public static void flushCSP(PageContext ctx)

Writes a dynamic Content Security Policy header to the response.

Parameters:

ctx - the PageContext object