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/*
* Copyright 2004-2014 ICEsoft Technologies Canada Corp.
*
* 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 org.icefaces.ace.component.richtextentry;
import org.icefaces.impl.util.Base64;
import org.icefaces.impl.util.Util;
import org.icefaces.util.EnvUtils;
import javax.faces.application.Resource;
import javax.faces.application.ResourceHandler;
import javax.faces.application.ResourceHandlerWrapper;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PreRenderViewEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.List;
import java.util.ArrayList;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.el.ELContext;
import java.util.regex.Pattern;
public class RichTextEntryResourceHandler extends ResourceHandlerWrapper {
private static final String META_INF_RESOURCES = "/META-INF/resources/";
private static final String ICEFACES_ACE_LIB = "icefaces.ace";
private static final String RICHTEXTENTRY_CKEDITOR_DIR = "richtextentry/ckeditor/";
private static final String CKEDITOR_MAPPING_JS = "ckeditor.mapping.js";
private ResourceHandler handler;
private Resource apiJS = null;
public RichTextEntryResourceHandler(ResourceHandler handler) {
this.handler = handler;
FacesContext.getCurrentInstance().getApplication().subscribeToEvent(PreRenderViewEvent.class, new SystemEventListener() {
public void processEvent(SystemEvent event) throws AbortProcessingException {
try {
if (apiJS == null) createResource(RICHTEXTENTRY_CKEDITOR_DIR + CKEDITOR_MAPPING_JS);
} catch (Exception e) {
e.printStackTrace();
}
}
public boolean isListenerForSource(Object source) {
return EnvUtils.isICEfacesView(FacesContext.getCurrentInstance());
}
});
}
public ResourceHandler getWrapped() {
return handler;
}
public Resource createResource(String resourceName) {
return createResource(resourceName, null, null);
}
public Resource createResource(String resourceName, String libraryName) {
return createResource(resourceName, libraryName, null);
}
public Resource createResource(String resourceName, String libraryName, String contentType) {
if ((RICHTEXTENTRY_CKEDITOR_DIR + CKEDITOR_MAPPING_JS).equals(resourceName)) {
if (apiJS == null) {
apiJS = recreateResource(super.createResource(resourceName, ICEFACES_ACE_LIB));
}
return apiJS;
} else {
return super.createResource(resourceName, libraryName, contentType);
}
}
private Resource recreateResource(Resource resource) {
byte[] content;
try {
InputStream in = this.getClass().getResourceAsStream(META_INF_RESOURCES + ICEFACES_ACE_LIB + "/" + RICHTEXTENTRY_CKEDITOR_DIR + CKEDITOR_MAPPING_JS);
content = readIntoByteArray(in);
} catch (IOException e) {
content = new byte[0];
}
return new ResourceEntry(RICHTEXTENTRY_CKEDITOR_DIR + CKEDITOR_MAPPING_JS, resource, content);
}
private static byte[] readIntoByteArray(InputStream in) throws IOException {
byte[] buffer = new byte[4096];
int bytesRead;
ByteArrayOutputStream out = new ByteArrayOutputStream();
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.flush();
return out.toByteArray();
}
private static class ResourceEntry extends Resource {
private Date lastModified = new Date();
private String localPath;
private Resource wrapped;
private byte[] content;
private String mimeType;
private ResourceEntry(String localPath, Resource wrapped, byte[] content) {
this.localPath = localPath;
this.wrapped = wrapped;
this.content = content;
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
this.mimeType = externalContext.getMimeType(localPath);
}
public String getLibraryName() {
return ICEFACES_ACE_LIB;
}
public String getResourceName() {
return localPath;
}
public InputStream getInputStream() throws IOException {
return new ELEvaluatingInputStream(FacesContext.getCurrentInstance(), new ByteArrayInputStream(content), ICEFACES_ACE_LIB);
}
public Map getResponseHeaders() {
HashMap headers = new HashMap();
headers.put("ETag", eTag());
headers.put("Cache-Control", "public");
headers.put("Content-Type", mimeType);
headers.put("Date", Util.formatHTTPDate(new Date()));
headers.put("Last-Modified", Util.formatHTTPDate(lastModified));
return headers;
}
public String getContentType() {
return mimeType;
}
public String getRequestPath() {
return wrapped.getRequestPath();
}
public URL getURL() {
try {
return FacesContext.getCurrentInstance().getExternalContext().getResource(localPath);
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
public boolean userAgentNeedsUpdate(FacesContext context) {
try {
Date modifiedSince = Util.parseHTTPDate(context.getExternalContext().getRequestHeaderMap().get("If-Modified-Since"));
return lastModified.getTime() > modifiedSince.getTime() + 1000;
} catch (Throwable e) {
return true;
}
}
private String eTag() {
return Base64.encode(String.valueOf(localPath.hashCode()));
}
}
// Taken from Mojarra
private static class ELEvaluatingInputStream extends InputStream {
private List buf = new ArrayList(1024);
private boolean failedExpressionTest = false;
private boolean writingExpression = false;
private InputStream inner;
private FacesContext ctx;
private String libraryName;
private boolean expressionEvaluated;
private static Pattern pattern = Pattern.compile(":");
// ---------------------------------------------------- Constructors
public ELEvaluatingInputStream(FacesContext ctx,
InputStream inner,
String libraryName) {
this.inner = inner;
this.ctx = ctx;
this.libraryName = libraryName;
}
// ------------------------------------------------ Methods from InputStream
@Override
public int read() throws IOException {
int i;
char c;
if (failedExpressionTest) {
i = nextRead;
nextRead = -1;
failedExpressionTest = false;
} else if (writingExpression) {
if (0 < buf.size()) {
i = buf.remove(0);
} else {
writingExpression = false;
i = inner.read();
}
} else {
// Read a character.
i = inner.read();
c = (char) i;
// If it *might* be an expression...
if (c == '#') {
// read another character.
i = inner.read();
c = (char) i;
// If it's '{', assume we have an expression.
if (c == '{') {
// read it into the buffer, and evaluate it into the
// same buffer.
readExpressionIntoBufferAndEvaluateIntoBuffer();
// set the flag so that we need to return content
// from the buffer.
writingExpression = true;
// Make sure to swallow the '{'.
i = this.read();
} else {
// It's not an expression, we need to return '#',
i = (int) '#';
// then return whatever we just read, on the
// *next* read;
nextRead = (int) c;
failedExpressionTest = true;
}
}
}
return i;
}
private int nextRead = -1;
private void readExpressionIntoBufferAndEvaluateIntoBuffer()
throws IOException {
int i;
char c;
do {
i = inner.read();
c = (char) i;
if (c == '}') {
evaluateExpressionIntoBuffer();
} else {
buf.add(i);
}
} while (c != '}' && i != -1);
}
/*
* At this point, we know that getBuf() returns a List
* that contains the bytes of the expression.
* Turn it into a String, turn the String into a ValueExpression,
* evaluate it, store the toString() of it in
* expressionResult;
*/
private void evaluateExpressionIntoBuffer() {
char chars[] = new char[buf.size()];
for (int i = 0, len = buf.size(); i < len; i++) {
chars[i] = (char) (int) buf.get(i);
}
String expressionBody = new String(chars);
int colon;
// If this expression contains a ":"
if (-1 != (colon = expressionBody.indexOf(":"))) {
// Make sure it contains only one ":"
if (!isPropertyValid(expressionBody)) {
String message = "INVALID_RESOURCE_FORMAT_COLON_ERROR: " + expressionBody;
throw new ELException(message);
}
String[] parts = pattern.split(expressionBody, 0);
if (null == parts[0] || null == parts[1]) {
String message = "INVALID_RESOURCE_FORMAT_NO_LIBRARY_NAME_ERROR: " + expressionBody;
throw new ELException(message);
}
try {
int mark = parts[0].indexOf("[") + 2;
char quoteMark = parts[0].charAt(mark - 1);
parts[0] = parts[0].substring(mark, colon);
if (parts[0].equals("this")) {
parts[0] = libraryName;
mark = parts[1].indexOf("]") - 1;
parts[1] = parts[1].substring(0, mark);
expressionBody = "resource[" + quoteMark + parts[0] +
":" + parts[1] + quoteMark + "]";
}
}
catch (Exception e) {
String message = "INVALID_RESOURCE_FORMAT_ERROR: " + expressionBody;
throw new ELException(message);
}
}
ELContext elContext = ctx.getELContext();
expressionEvaluated = true;
ValueExpression ve =
ctx.getApplication().getExpressionFactory().
createValueExpression(elContext, "#{" + expressionBody +
"}", String.class);
Object value = ve.getValue(elContext);
String expressionResult = ((value != null) ? value.toString() : "");
buf.clear();
for (int i = 0, len = expressionResult.length(); i < len; i++) {
buf.add((int) expressionResult.charAt(i));
}
}
@Override
public void close() throws IOException {
inner.close();
super.close();
}
private boolean isPropertyValid(String property) {
int idx = property.indexOf(':');
return (property.indexOf(':', idx + 1) == -1);
}
}
}