115 lines
3.5 KiB
Java
115 lines
3.5 KiB
Java
/**
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*
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*/
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package org.gcube.informationsystem.resourceregistry.client.proxy;
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import java.io.BufferedReader;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.UnsupportedEncodingException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.net.URLEncoder;
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import org.gcube.common.authorization.client.Constants;
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import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
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import org.gcube.common.clients.Call;
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import org.gcube.common.clients.GCubeEndpoint;
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import org.gcube.common.clients.delegates.AsyncProxyDelegate;
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import org.gcube.common.clients.delegates.ProxyDelegate;
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import org.gcube.common.clients.exceptions.ServiceException;
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import org.gcube.informationsystem.resourceregistry.api.exceptions.InvalidQueryException;
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import org.gcube.informationsystem.resourceregistry.api.rest.AccessPath;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
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*/
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public class ResourceRegistryClient {
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private static Logger logger = LoggerFactory
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.getLogger(ResourceRegistryClient.class);
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private final AsyncProxyDelegate<GCubeEndpoint> delegate;
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public ResourceRegistryClient(ProxyDelegate<GCubeEndpoint> config) {
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this.delegate = new AsyncProxyDelegate<GCubeEndpoint>(config);
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}
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protected HttpURLConnection makeRequest(URL url, String method,
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boolean includeTokenInHeader) throws Exception {
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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if (includeTokenInHeader) {
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connection.setRequestProperty(Constants.TOKEN_HEADER_ENTRY,
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SecurityTokenProvider.instance.get());
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}
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connection.setRequestMethod(method);
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return connection;
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}
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protected void appendQueryParameter(StringBuilder builder, String name,
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String value) throws UnsupportedEncodingException {
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builder.append(name).append("=");
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String encodedValue = URLEncoder.encode(value, "UTF-8");
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builder.append(encodedValue).append("&");
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}
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public String query(final String query, final String fetchPlan)
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throws InvalidQueryException {
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Call<GCubeEndpoint, String> call = new Call<GCubeEndpoint, String>() {
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public String call(GCubeEndpoint endpoint) throws Exception {
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StringBuilder callUrl = new StringBuilder(endpoint.getAddress());
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callUrl.append("/").append(AccessPath.ACCESS_PATH_PART)
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.append("/");
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appendQueryParameter(callUrl, AccessPath.QUERY_PARAM, query);
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if (fetchPlan != null) {
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appendQueryParameter(callUrl,
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AccessPath.FETCH_PLAN_PARAM, fetchPlan);
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}
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URL url = new URL(callUrl.toString());
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HttpURLConnection connection = makeRequest(url, "GET", false);
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connection.setDoOutput(true);
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connection.setDoInput(false);
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connection.setRequestProperty("Content-type", "text/plain");
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logger.debug("Response code for {} is {} : {}",
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callUrl.toString(), connection.getResponseCode(),
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connection.getResponseMessage());
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if (connection.getResponseCode() != 200) {
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throw new Exception(
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"Error Querying Resource Registry Service");
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}
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StringBuilder result = new StringBuilder();
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try (BufferedReader reader = new BufferedReader(
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new InputStreamReader(
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(InputStream) connection.getContent()))) {
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String line;
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while ((line = reader.readLine()) != null) {
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result.append(line);
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}
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}
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return result.toString();
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};
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};
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try {
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return delegate.make(call);
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} catch (Exception e) {
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throw new ServiceException(e);
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}
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}
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}
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