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314 lines
9.5 KiB
Java
314 lines
9.5 KiB
Java
package org.gcube.gcat.utils;
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import java.io.BufferedReader;
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import java.io.DataOutputStream;
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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.io.StringWriter;
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import java.io.UnsupportedEncodingException;
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import java.net.HttpURLConnection;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLEncoder;
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import java.util.HashMap;
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import java.util.Map;
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import javax.ws.rs.InternalServerErrorException;
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import javax.ws.rs.WebApplicationException;
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import javax.ws.rs.core.Response.Status;
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import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
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import org.gcube.common.scope.api.ScopeProvider;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class HTTPCall {
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private static final Logger logger = LoggerFactory.getLogger(HTTPCall.class);
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protected static final String USER_AGENT_KEY = "User-Agent";
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protected static final String USER_AGENT_NAME = Constants.CATALOGUE_NAME;
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public enum HTTPMETHOD {
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HEAD, GET, POST, PUT, DELETE;
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@Override
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public String toString() {
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return this.name();
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}
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}
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public static final String PATH_SEPARATOR = "/";
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public static final String PARAM_STARTER = "?";
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public static final String PARAM_EQUALS = "=";
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public static final String PARAM_SEPARATOR = "&";
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public static final String UTF8 = "UTF-8";
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protected final String address;
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protected final String userAgent;
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protected Map<String,String> headers;
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/**
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* When the target service is a gCube Service it adds the HTTP header
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* to provide gCube authorization token and/or scope
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*/
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protected boolean gCubeTargetService;
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public boolean isgCubeTargetService() {
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return gCubeTargetService;
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}
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public void setgCubeTargetService(boolean gCubeTargetService) {
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this.gCubeTargetService = gCubeTargetService;
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}
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public HTTPCall(String address) {
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this(address, HTTPCall.USER_AGENT_NAME);
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}
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protected HTTPCall(String address, String userAgent) {
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this.address = address;
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this.userAgent = userAgent;
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this.gCubeTargetService = true;
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this.headers = new HashMap<>();
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addHeader(USER_AGENT_KEY, this.userAgent);
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}
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public void addHeader(String key, String value) {
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headers.put(key, value);
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}
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protected String getParametersDataString(Map<String,String> parameters) throws UnsupportedEncodingException {
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if(parameters == null) {
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return null;
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}
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StringBuilder result = new StringBuilder();
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boolean first = true;
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for(String key : parameters.keySet()) {
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if(first) {
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first = false;
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} else {
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result.append(PARAM_SEPARATOR);
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}
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result.append(URLEncoder.encode(key, UTF8));
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result.append(PARAM_EQUALS);
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result.append(URLEncoder.encode(parameters.get(key), UTF8));
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}
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return result.toString();
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}
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protected URL getURL(String address, String path, String urlParameters) throws MalformedURLException {
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StringWriter stringWriter = new StringWriter();
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stringWriter.append(address);
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if(address.endsWith(PATH_SEPARATOR)) {
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if(path.startsWith(PATH_SEPARATOR)) {
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path = path.substring(1);
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}
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} else {
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if(path.compareTo("") != 0 && !path.startsWith(PATH_SEPARATOR)) {
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stringWriter.append(PATH_SEPARATOR);
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}
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}
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stringWriter.append(path);
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if(urlParameters != null) {
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stringWriter.append(PARAM_STARTER);
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stringWriter.append(urlParameters);
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}
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return getURL(stringWriter.toString());
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}
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protected URL getURL(String urlString) throws MalformedURLException {
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URL url = new URL(urlString);
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if(url.getProtocol().compareTo("https") == 0) {
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url = new URL(url.getProtocol(), url.getHost(), url.getDefaultPort(), url.getFile());
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}
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return url;
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}
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protected HttpURLConnection getConnection(String path, String urlParameters, HTTPMETHOD method, String body,
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InputStream inputStream, String contentType) throws Exception {
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URL url = getURL(address, path, urlParameters);
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return getConnection(url, method, body, inputStream, contentType);
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}
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public URL getFinalURL(URL url) {
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try {
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URL finalURL = url;
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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connection.setInstanceFollowRedirects(false);
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int responseCode = connection.getResponseCode();
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String responseMessage = connection.getResponseMessage();
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if(responseCode >= Status.BAD_REQUEST.getStatusCode()) {
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Status status = Status.fromStatusCode(responseCode);
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throw new WebApplicationException(responseMessage, status);
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}
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if(responseCode == HttpURLConnection.HTTP_MOVED_TEMP || responseCode == HttpURLConnection.HTTP_MOVED_PERM
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|| responseCode == HttpURLConnection.HTTP_SEE_OTHER
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|| responseCode == Status.TEMPORARY_REDIRECT.getStatusCode() || responseCode == 308) {
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finalURL = getURL(connection.getHeaderField("Location"));
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finalURL = getFinalURL(finalURL);
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}
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return finalURL;
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}catch (WebApplicationException e) {
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throw e;
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}catch (Exception e) {
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throw new InternalServerErrorException(e);
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}
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}
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protected HttpURLConnection getConnection(URL url, HTTPMETHOD method, String body, InputStream inputStream,
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String contentType) throws Exception {
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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if(gCubeTargetService) {
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if(SecurityTokenProvider.instance.get() == null) {
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if(ScopeProvider.instance.get() == null) {
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throw new RuntimeException("Null Token and Scope. Please set your token first.");
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}
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connection.setRequestProperty("gcube-scope", ScopeProvider.instance.get());
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} else {
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connection.setRequestProperty(org.gcube.common.authorization.client.Constants.TOKEN_HEADER_ENTRY,
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SecurityTokenProvider.instance.get());
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}
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}
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connection.setDoOutput(true);
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connection.setRequestProperty("Content-type", contentType);
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for(String key : headers.keySet()) {
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connection.setRequestProperty(key, headers.get(key));
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}
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connection.setRequestMethod(method.toString());
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if(inputStream != null && (method == HTTPMETHOD.POST || method == HTTPMETHOD.PUT)) {
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DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
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byte[] buffer = new byte[1024];
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int len;
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while((len = inputStream.read(buffer)) > 0) {
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wr.write(buffer, 0, len);
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}
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wr.flush();
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wr.close();
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}
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if(body != null && (method == HTTPMETHOD.POST || method == HTTPMETHOD.PUT)) {
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DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
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wr.writeBytes(body);
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wr.flush();
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wr.close();
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}
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int responseCode = connection.getResponseCode();
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String responseMessage = connection.getResponseMessage();
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logger.trace("{} {} : {} - {}", method, connection.getURL(), responseCode, responseMessage);
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// 308 Permanent Redirect https://tools.ietf.org/html/rfc7538#section-3
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if(responseCode == HttpURLConnection.HTTP_MOVED_TEMP || responseCode == HttpURLConnection.HTTP_MOVED_PERM
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|| responseCode == HttpURLConnection.HTTP_SEE_OTHER
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|| responseCode == Status.TEMPORARY_REDIRECT.getStatusCode() || responseCode == 308) {
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URL redirectURL = getURL(connection.getHeaderField("Location"));
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logger.trace("{} is going to be redirect to {}", url.toString(), redirectURL.toString());
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connection = getConnection(redirectURL, method, body, inputStream, contentType);
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}
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return connection;
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}
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protected StringBuilder getStringBuilder(InputStream inputStream) throws IOException {
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StringBuilder result = new StringBuilder();
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try(BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
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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;
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}
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public String call(String path, HTTPMETHOD method, Map<String,String> parameters, String contentType) {
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return call(path, method, parameters, null, contentType);
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}
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public String call(String path, HTTPMETHOD method, String body, String contentType) {
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return call(path, method, null, body, contentType);
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}
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public String call(String path, HTTPMETHOD method, Map<String,String> parameters, String body, String contentType) {
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return call(path, method, body, null, parameters, contentType);
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}
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public String call(String path, HTTPMETHOD method, InputStream inputStream, Map<String,String> parameters,
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String contentType) {
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return call(path, method, null, inputStream, parameters, contentType);
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}
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private String call(String path, HTTPMETHOD method, String body, InputStream inputStream,
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Map<String,String> parameters, String contentType) {
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HttpURLConnection connection;
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try {
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String urlParameters = getParametersDataString(parameters);
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connection = getConnection(path, urlParameters, method, body, inputStream, contentType);
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int responseCode = connection.getResponseCode();
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String responseMessage = connection.getResponseMessage();
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logger.info("{} {} : {} - {}", method, connection.getURL(), responseCode, responseMessage);
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if(responseCode >= Status.BAD_REQUEST.getStatusCode()) {
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try {
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StringBuilder result = getStringBuilder(connection.getErrorStream());
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String res = result.toString();
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logger.trace("Server returned content : {}", res);
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return res;
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}catch (Exception e) {
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Status status = Status.fromStatusCode(responseCode);
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throw new WebApplicationException(responseMessage, status);
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}
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}
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StringBuilder result = getStringBuilder(connection.getInputStream());
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String res = result.toString();
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logger.trace("Server returned content : {}", res);
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connection.disconnect();
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return res;
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} catch(WebApplicationException e) {
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throw e;
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} catch(Exception e) {
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throw new InternalServerErrorException(e);
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}
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}
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}
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