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ph-oton basic application stuff
/*
* Copyright (C) 2014-2021 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.helger.photon.app.html;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.NotThreadSafe;
import com.helger.commons.CGlobal;
import com.helger.commons.collection.impl.CommonsArrayList;
import com.helger.commons.collection.impl.ICommonsList;
import com.helger.commons.io.stream.HasInputStream;
import com.helger.commons.io.stream.NonBlockingByteArrayOutputStream;
import com.helger.commons.mime.CMimeType;
import com.helger.commons.mime.IMimeType;
import com.helger.commons.mime.MimeType;
import com.helger.commons.string.StringHelper;
import com.helger.html.hc.IHCConversionSettings;
import com.helger.html.hc.IHCNode;
import com.helger.html.hc.config.HCSettings;
import com.helger.html.hc.ext.HCConditionalCommentNode;
import com.helger.html.hc.html.metadata.HCCSSNodeDetector;
import com.helger.html.hc.html.metadata.HCHead;
import com.helger.html.hc.html.metadata.HCLink;
import com.helger.html.hc.html.metadata.HCMeta;
import com.helger.html.hc.html.root.HCHtml;
import com.helger.html.hc.html.script.HCJSNodeDetector;
import com.helger.html.hc.html.script.HCScriptFile;
import com.helger.html.hc.render.HCRenderer;
import com.helger.html.meta.EStandardMetaElement;
import com.helger.html.resource.css.ICSSPathProvider;
import com.helger.html.resource.js.IJSPathProvider;
import com.helger.photon.app.PhotonAppSettings;
import com.helger.photon.app.resource.IWebSiteResourceBundleProvider;
import com.helger.photon.app.resource.WebSiteResourceBundleSerialized;
import com.helger.photon.app.resource.WebSiteResourceWithCondition;
import com.helger.servlet.response.UnifiedResponse;
import com.helger.web.scope.IRequestWebScopeWithoutResponse;
/**
* A utility class for consistent HTML creation.
*
* @author Philip Helger
*/
@NotThreadSafe
public final class PhotonHTMLHelper
{
public static final String META_GENERATOR_VALUE = "https://github.com/phax/ph-oton // phax // ASL 2.0";
private PhotonHTMLHelper ()
{}
/**
* Get the HTML MIME type to use
*
* @param aRequestScope
* The request scope. May be null-
* @return Never null.
*/
@Nonnull
public static IMimeType getMimeType (@Nullable final IRequestWebScopeWithoutResponse aRequestScope)
{
// Add the charset to the MIME type
return new MimeType (CMimeType.TEXT_HTML).addParameter (CMimeType.PARAMETER_NAME_CHARSET, HCSettings.getHTMLCharset ().name ());
}
@Nonnull
public static IHCNode getCSSNode (@Nonnull final IRequestWebScopeWithoutResponse aRequestScope,
@Nonnull final ICSSPathProvider aCSS,
final boolean bRegular)
{
final HCLink aLink = HCLink.createCSSLink (PhotonAppSettings.getCSSPath (aRequestScope, aCSS, bRegular))
.setMedia (aCSS.getMediaList ())
.setPathProvider (aCSS);
final String sConditionalComment = aCSS.getConditionalComment ();
if (StringHelper.hasText (sConditionalComment))
return new HCConditionalCommentNode (sConditionalComment, aLink);
return aLink;
}
@Nonnull
public static IHCNode getJSNode (@Nonnull final IRequestWebScopeWithoutResponse aRequestScope,
@Nonnull final IJSPathProvider aJS,
final boolean bRegular)
{
final HCScriptFile aScript = new HCScriptFile ().setSrc (PhotonAppSettings.getJSPath (aRequestScope, aJS, bRegular))
.setPathProvider (aJS);
final String sConditionalComment = aJS.getConditionalComment ();
if (StringHelper.hasText (sConditionalComment))
return new HCConditionalCommentNode (sConditionalComment, aScript);
return aScript;
}
public static void createHTMLResponse (@Nonnull final IRequestWebScopeWithoutResponse aRequestScope,
@Nonnull final UnifiedResponse aUnifiedResponse,
@Nonnull final IHTMLProvider aHTMLProvider)
{
// Build the main HC tree
final HCHtml aHtml = aHTMLProvider.createHTML (aRequestScope);
// Add some ad comment :)
aHtml.head ().metaElements ().add (new HCMeta ().setName (EStandardMetaElement.GENERATOR.getName ()).setContent (META_GENERATOR_VALUE));
// Convert HTML to String, including namespaces
try (final NonBlockingByteArrayOutputStream aBAOS = new NonBlockingByteArrayOutputStream (50 * CGlobal.BYTES_PER_KILOBYTE))
{
final IMimeType aMimeType = getMimeType (aRequestScope);
final IHCConversionSettings aCS = HCSettings.getConversionSettings ();
HCRenderer.writeHtmlTo (aHtml, aCS, aBAOS);
// Write to response
aUnifiedResponse.setMimeType (aMimeType)
.setCharset (aCS.getCharset ())
.setContent (HasInputStream.multiple (aBAOS::getAsInputStream))
.disableCaching ();
}
}
/**
* Merge external CSS and JS contents to a single resource for improved
* browser performance. All source nodes are taken from the head and all
* target nodes are written to the head.
*
* @param aRequestScope
* Current request scope. Never null.
* @param aHead
* The HTML head object. Never null.
* @param bMergeCSS
* true to aggregate CSS entries.
* @param bMergeJS
* true to aggregate JS entries.
* @param aWSRBMgr
* The resource bundle provider. May not be null.
*/
public static void mergeExternalCSSAndJSNodes (@Nonnull final IRequestWebScopeWithoutResponse aRequestScope,
@Nonnull final HCHead aHead,
final boolean bMergeCSS,
final boolean bMergeJS,
@Nonnull final IWebSiteResourceBundleProvider aWSRBMgr)
{
if (!bMergeCSS && !bMergeJS)
{
// Nothing to do
return;
}
final boolean bRegular = HCSettings.isUseRegularResources ();
if (bMergeCSS)
{
// Extract all CSS nodes for merging
final ICommonsList aCSSNodes = new CommonsArrayList <> ();
aHead.getAllAndRemoveAllCSSNodes (aCSSNodes);
final ICommonsList aCSSs = new CommonsArrayList <> ();
for (final IHCNode aNode : aCSSNodes)
{
boolean bStartMerge = true;
if (HCCSSNodeDetector.isDirectCSSFileNode (aNode))
{
final ICSSPathProvider aPathProvider = ((HCLink) aNode).getPathProvider ();
if (aPathProvider != null)
{
aCSSs.add (WebSiteResourceWithCondition.createForCSS (aPathProvider, bRegular));
bStartMerge = false;
}
}
if (bStartMerge)
{
if (!aCSSs.isEmpty ())
{
for (final WebSiteResourceBundleSerialized aBundle : aWSRBMgr.getResourceBundles (aCSSs, bRegular))
aHead.addCSS (aBundle.createNode (aRequestScope));
aCSSs.clear ();
}
// Add the current (non-mergable) node again to head after merging
aHead.addCSS (aNode);
}
}
// Add the remaining nodes (if any)
if (!aCSSs.isEmpty ())
for (final WebSiteResourceBundleSerialized aBundle : aWSRBMgr.getResourceBundles (aCSSs, bRegular))
aHead.addCSS (aBundle.createNode (aRequestScope));
}
if (bMergeJS)
{
// Extract all JS nodes for merging
final ICommonsList aJSNodes = new CommonsArrayList <> ();
aHead.getAllAndRemoveAllJSNodes (aJSNodes);
final ICommonsList aJSs = new CommonsArrayList <> ();
for (final IHCNode aNode : aJSNodes)
{
boolean bStartMerge = true;
if (HCJSNodeDetector.isDirectJSFileNode (aNode))
{
final IJSPathProvider aPathProvider = ((HCScriptFile) aNode).getPathProvider ();
if (aPathProvider != null)
{
aJSs.add (WebSiteResourceWithCondition.createForJS (aPathProvider, bRegular));
bStartMerge = false;
}
}
if (bStartMerge)
{
if (!aJSs.isEmpty ())
{
for (final WebSiteResourceBundleSerialized aBundle : aWSRBMgr.getResourceBundles (aJSs, bRegular))
aHead.addJS (aBundle.createNode (aRequestScope));
aJSs.clear ();
}
// Add the current (non-mergable) node again to head after merging
aHead.addJS (aNode);
}
}
// Add the remaining nodes (if any)
if (!aJSs.isEmpty ())
for (final WebSiteResourceBundleSerialized aBundle : aWSRBMgr.getResourceBundles (aJSs, bRegular))
aHead.addJS (aBundle.createNode (aRequestScope));
}
}
}