gcat-client/src/main/java/org/gcube/gcat/client/GCatClient.java

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package org.gcube.gcat.client;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.ForbiddenException;
import javax.ws.rs.NotFoundException;
import javax.ws.rs.WebApplicationException;
import org.gcube.common.gxhttp.reference.GXConnection.HTTPMETHOD;
import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
import org.gcube.gcat.api.GCatConstants;
/**
* @author Luca Frosini (ISTI - CNR)
*/
abstract class GCatClient {
protected URL serviceURL;
protected List<String> basePaths;
protected GXHTTPStringRequest gxhttpStringRequest;
public void enforceServiceURL(URL enforcedServiceURL) {
this.serviceURL = enforcedServiceURL;
}
public GCatClient(URL enforcedServiceURL, String basePath, String... basePaths) throws MalformedURLException {
this.serviceURL = enforcedServiceURL;
this.basePaths = new ArrayList<>();
this.basePaths.add(basePath);
this.basePaths.addAll(Arrays.asList(basePaths));
}
public GCatClient(String basePath, String... basePaths) throws MalformedURLException {
this.serviceURL = GCatClientDiscovery.getServiceURL();
this.basePaths = new ArrayList<>();
this.basePaths.add(basePath);
this.basePaths.addAll(Arrays.asList(basePaths));
}
protected static StringBuilder getStringBuilder(InputStream inputStream) throws IOException {
StringBuilder result = new StringBuilder();
try(BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while((line = reader.readLine()) != null) {
result.append(line);
}
}
return result;
}
protected String parseHttpURLConnection(HttpURLConnection connection) throws WebApplicationException {
try {
int responseCode = connection.getResponseCode();
// String responseMessage = connection.getResponseMessage();
if(connection.getRequestMethod().compareTo(HTTPMETHOD.HEAD.toString()) == 0) {
if(responseCode == HttpURLConnection.HTTP_NO_CONTENT) {
return null;
}
if(responseCode == HttpURLConnection.HTTP_NOT_FOUND) {
throw new NotFoundException();
}
if(responseCode == HttpURLConnection.HTTP_FORBIDDEN) {
throw new ForbiddenException();
}
}
if(responseCode >= HttpURLConnection.HTTP_BAD_REQUEST) {
InputStream inputStream = connection.getErrorStream();
StringBuilder result = getStringBuilder(inputStream);
String res = result.toString();
throw new WebApplicationException(res, responseCode);
}
StringBuilder result = getStringBuilder(connection.getInputStream());
return result.toString();
} catch (WebApplicationException e) {
throw e;
} catch (Exception e) {
throw new WebApplicationException(e);
} finally {
connection.disconnect();
}
}
protected void initRequest() throws UnsupportedEncodingException {
gxhttpStringRequest = GXHTTPStringRequest.newRequest(serviceURL.toString());
gxhttpStringRequest.from(GCatClient.class.getSimpleName());
for(String p : basePaths) {
gxhttpStringRequest.path(p);
}
}
protected String list(Map<String, String> queryParams, String... paths) throws WebApplicationException {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
gxhttpStringRequest.queryParams(queryParams);
HttpURLConnection httpURLConnection = gxhttpStringRequest.get();
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
protected String create(String body, String... paths) {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
HttpURLConnection httpURLConnection = gxhttpStringRequest.post(body);
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
protected String read(String... paths) throws WebApplicationException {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
HttpURLConnection httpURLConnection = gxhttpStringRequest.get();
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
protected String update(String body, String... paths) throws WebApplicationException {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
HttpURLConnection httpURLConnection = gxhttpStringRequest.put(body);
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
protected String patch(String body, String... paths) throws WebApplicationException {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
gxhttpStringRequest.withBody(body);
HttpURLConnection httpURLConnection = gxhttpStringRequest.patch();
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
protected String delete(Boolean purge, String... paths) throws WebApplicationException {
try {
initRequest();
for(String p : paths) {
gxhttpStringRequest.path(p);
}
if(purge!=null) {
Map<String, String> queryParams = new HashMap<>();
queryParams.put(GCatConstants.PURGE_QUERY_PARAMETER, String.valueOf(purge));
gxhttpStringRequest.queryParams(queryParams);
}
HttpURLConnection httpURLConnection = gxhttpStringRequest.delete();
return parseHttpURLConnection(httpURLConnection);
}catch (WebApplicationException e) {
throw e;
}catch (Exception e) {
throw new WebApplicationException(e);
}
}
}