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118 lines
3.6 KiB
Java
118 lines
3.6 KiB
Java
package org.gcube.smartgears.extensions.resource;
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import static org.gcube.smartgears.Constants.application_xhtml;
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import static org.gcube.smartgears.Constants.frontpage_file_path;
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import static org.gcube.smartgears.extensions.HttpExtension.Method.GET;
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import static org.gcube.smartgears.handlers.application.request.RequestError.application_error;
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import static org.gcube.smartgears.utils.Utils.closeSafely;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import jakarta.servlet.ServletException;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import org.gcube.smartgears.extensions.ApiResource;
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import org.gcube.smartgears.extensions.ApiSignature;
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import org.gcube.smartgears.provider.ProviderFactory;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* An {@link ApiResource} of {@link RemoteResource} at {@link #mapping}.
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*
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* @author Fabio Simeoni
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*
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*/
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public class FrontPageResource extends ApiResource {
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// the variable replacement pattern
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private static Pattern pattern = Pattern.compile("\\$\\{(.+?)\\}");
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// log on behalf of extension
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private static final Logger log = LoggerFactory.getLogger(RemoteResource.class);
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private static final long serialVersionUID = 1L;
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public static final String mapping = "/";
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private static final ApiSignature signature = handles(mapping).with(method(GET).produces(application_xhtml));
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FrontPageResource() {
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super(signature);
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}
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@Override
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public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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InputStream page = getClass().getResourceAsStream(frontpage_file_path);
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if (page == null) {
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log.error("invalid distribution: missing {}", frontpage_file_path);
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application_error.fire("invalid distribution: missing " + frontpage_file_path);
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}
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Map<String, String> values = values();
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BufferedReader reader = null;
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try {
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String line = null;
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reader = new BufferedReader(new InputStreamReader(page));
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while ((line = reader.readLine()) != null)
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resp.getWriter().write(interpolate(line, values));
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} catch (Exception e) {
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application_error.fire("could not read " + frontpage_file_path, e);
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} finally {
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closeSafely(reader);
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}
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}
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private Map<String, String> values() {
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Map<String, String> values = new HashMap<String, String>();
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values.put("profile_link", ProfileResource.mapping.substring(1,ProfileResource.mapping.length()));
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values.put("config_link", ConfigurationResource.mapping.substring(1,ConfigurationResource.mapping.length()));
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values.put("name", context().name());
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values.put("version", context().configuration().version());
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String infrastructure = context().container().configuration().infrastructure();
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values.put("infra", infrastructure);
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values.put("status", context().lifecycle().state().toString());
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values.put("smartgears-version", ProviderFactory.provider().smartgearsConfiguration().getVersion());
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return values;
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}
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public static String interpolate(String text, Map<String, String> replacements) {
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Matcher matcher = pattern.matcher(text);
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StringBuffer buffer = new StringBuffer();
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while (matcher.find()) {
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String replacement = replacements.get(matcher.group(1));
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if (replacement != null) {
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matcher.appendReplacement(buffer, ""); // safer in case replacements include some of the variable
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// characters
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buffer.append(replacement);
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}
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}
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matcher.appendTail(buffer);
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return buffer.toString();
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}
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}
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