/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* 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.uberfire.client.plugin;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Alternative;
import javax.inject.Inject;
import com.google.gwt.dom.client.AnchorElement;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import org.slf4j.Logger;
import org.uberfire.mvp.ParameterizedCommand;
/**
* Searches for runtime plugins and frameworks by parsing the directory listing at <tt>${appBase}/plugins/</tt> or
* <tt>${appBase}/plugins/</tt> respectively. Any {@code <a>} tag with an href whose URI ends in <tt>.js</tt> will
* qualify as a runtime plugin or framework, and its contents will be fetched with a separate request. Normally, this
* will be compatible with any web server's built-in directory listing feature. If it isn't, just manually add an
* <tt>index.html</tt> file that has links to the .js files you care about.
*/
@Dependent
@Alternative
public class RuntimePluginsServiceProxyClientImpl implements RuntimePluginsServiceProxy {
@Inject
private Logger logger;
@Override
public void getTemplateContent(final String contentUrl,
final ParameterizedCommand<String> command) {
RequestBuilder contentRb = new RequestBuilder(RequestBuilder.GET,
"plugins/" + contentUrl);
try {
contentRb.sendRequest(null,
new RequestCallback() {
@Override
public void onResponseReceived(Request request,
Response response) {
command.execute(response.getText());
}
@Override
public void onError(Request request,
Throwable ex) {
logger.warn("Error in template content request for " + contentUrl,
ex);
command.execute(null);
}
});
} catch (RequestException ex) {
logger.warn("Couldn't load template content at " + contentUrl,
ex);
command.execute(null);
}
}
@Override
public void listFrameworksContent(ParameterizedCommand<Collection<String>> command) {
findAndFetchContent("frameworks/",
".js",
"framework",
command);
}
@Override
public void listPluginsContent(final ParameterizedCommand<Collection<String>> command) {
findAndFetchContent("plugins/",
".js",
"plugin",
command);
}
private void findAndFetchContent(final String relativeUri,
final String filenameExtension,
final String fileType,
final ParameterizedCommand<Collection<String>> doWhenFinished) {
RequestBuilder rb = new RequestBuilder(RequestBuilder.GET,
relativeUri);
try {
rb.sendRequest(null,
new RequestCallback() {
@Override
public void onResponseReceived(Request request,
Response response) {
final List<String> pluginUrls = new ArrayList<String>();
final List<String> pluginContents = new ArrayList<String>();
final int[] contentErrors = new int[1];
Element detachedDiv = DOM.createDiv();
detachedDiv.setInnerHTML(response.getText());
NodeList<com.google.gwt.dom.client.Element> links = detachedDiv.getElementsByTagName("a");
for (int i = 0; i < links.getLength(); i++) {
AnchorElement aElem = (AnchorElement) links.getItem(i);
// DOM spec says these are already absolutized for us. Nice!
String href = aElem.getHref();
if (href.endsWith(filenameExtension)) {
pluginUrls.add(href);
}
}
if (pluginUrls.size() == 0) {
doWhenFinished.execute(Collections.<String>emptyList());
return;
}
for (final String href : pluginUrls) {
RequestBuilder contentRb = new RequestBuilder(RequestBuilder.GET,
href);
try {
contentRb.sendRequest(null,
new RequestCallback() {
@Override
public void onResponseReceived(Request request,
Response response) {
if (response.getStatusCode() == 200) {
pluginContents.add(response.getText());
} else {
contentErrors[0]++;
}
if (pluginContents.size() >= pluginUrls.size() + contentErrors[0]) {
doWhenFinished.execute(pluginContents);
}
}
@Override
public void onError(Request request,
Throwable exception) {
logger.warn("Error in " + fileType + " content request for " + href);
contentErrors[0]++;
if (pluginContents.size() >= pluginUrls.size() + contentErrors[0]) {
doWhenFinished.execute(pluginContents);
}
}
});
} catch (RequestException ex) {
logger.warn("Failed to send request for " + fileType + " " + href,
ex);
contentErrors[0]++;
if (pluginContents.size() >= pluginUrls.size() + contentErrors[0]) {
doWhenFinished.execute(pluginContents);
}
}
}
}
@Override
public void onError(Request request,
Throwable ex) {
logger.warn("Error in " + fileType + " list request. Not loading JS " + fileType + "s.",
ex);
doWhenFinished.execute(Collections.<String>emptyList());
}
});
} catch (RequestException ex) {
logger.warn("Couldn't load JS " + fileType + ". Continuing without runtime " + fileType + "s.",
ex);
doWhenFinished.execute(Collections.<String>emptyList());
}
}
}