1 files changed, 179 insertions, 0 deletions
diff --git a/catalog-fe/src/main/java/org/openecomp/sdc/fe/client/BackendClient.java b/catalog-fe/src/main/java/org/openecomp/sdc/fe/client/BackendClient.java
new file mode 100644
index 0000000000..93e17144c0
--- /dev/null
+++ b/catalog-fe/src/main/java/org/openecomp/sdc/fe/client/BackendClient.java
@@ -0,0 +1,179 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * SDC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.sdc.fe.client;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.ws.rs.container.AsyncResponse;
+import javax.ws.rs.core.Response;
+
+import org.apache.http.HttpStatus;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
+import org.apache.http.entity.InputStreamEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.ssl.SSLContextBuilder;
+import org.openecomp.sdc.common.api.Constants;
+import org.openecomp.sdc.common.api.ResponseInfo;
+import org.openecomp.sdc.common.api.ResponseInfo.ResponseStatusEnum;
+import org.openecomp.sdc.fe.impl.Audit;
+import org.openecomp.sdc.fe.impl.HttpRequestInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class BackendClient {
+
+	private static Logger log = LoggerFactory.getLogger(BackendClient.class.getName());
+
+	private HostnameVerifier hostnameVerifier = null;
+
+	private CloseableHttpClient backendHttpClient;
+	private String backendHost;
+	private String backendContext;
+
+	public BackendClient(String protocol, String backendHost, String backendContext) {
+
+		this.backendContext = backendContext;
+		hostnameVerifier = new HostnameVerifier() {
+
+			public boolean verify(String hostname, SSLSession session) {
+
+				return true;
+			}
+		};
+
+		if (protocol == null || protocol.isEmpty() || protocol.equals(Constants.HTTP)) {
+			backendHttpClient = HttpClients.createDefault();
+			this.backendHost = Constants.HTTP + "://" + backendHost;
+		} else {
+			// NULL can be returned in case of error
+			backendHttpClient = getSslClient();
+			this.backendHost = Constants.HTTPS + "://" + backendHost;
+		}
+
+	}
+
+	public HostnameVerifier getHostnameVerifier() {
+		return hostnameVerifier;
+	}
+
+	private CloseableHttpClient getSslClient() {
+
+		CloseableHttpClient httpClient = null;
+		try {
+
+			// SSLContextBuilder is not thread safe
+			SSLContextBuilder builder = new SSLContextBuilder();
+			builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());
+			SSLContext sslContext = builder.build();
+
+			httpClient = HttpClientBuilder.create().setSSLHostnameVerifier(hostnameVerifier).setSslcontext(sslContext)
+					.build();
+
+		} catch (Exception e) {
+			log.error("Failed to create https client", e);
+			return null;
+		}
+
+		return httpClient;
+
+	}
+
+	public ResponseInfo forwardRequestToBackend(HttpRequestInfo requestInfo, List<String> requiredHeaders,
+			AsyncResponse asyncResponse) {
+
+		ResponseInfo responseInfo = null;
+		log.debug("forwardRequestToBackend");
+		if (backendHttpClient == null) {
+			responseInfo = new ResponseInfo(ResponseStatusEnum.INTERNAL_ERROR, "Failed to create https client");
+			Audit.error(log, requestInfo, HttpStatus.SC_INTERNAL_SERVER_ERROR);
+			asyncResponse.resume(
+					Response.status(HttpStatus.SC_INTERNAL_SERVER_ERROR).entity(responseInfo.toString()).build());
+			return responseInfo;
+		}
+
+		CloseableHttpResponse response = null;
+		int status = HttpStatus.SC_INTERNAL_SERVER_ERROR;
+		HttpPost httpPost = new HttpPost(backendHost + backendContext);
+		try {
+
+			log.debug("Executing request {}", httpPost.getRequestLine());
+			httpPost.setEntity(new InputStreamEntity(requestInfo.getRequestData()));
+			boolean allHeadersAreSet = copyHeadersToRequest(requiredHeaders, requestInfo, httpPost);
+			if (!allHeadersAreSet) {
+				responseInfo = new ResponseInfo(ResponseStatusEnum.MISSING_HEADERS, "Required headers are missing");
+				asyncResponse
+						.resume(Response.status(HttpStatus.SC_BAD_REQUEST).entity(responseInfo.toString()).build());
+				Audit.error(log, requestInfo, HttpStatus.SC_BAD_REQUEST);
+			} else {
+				response = backendHttpClient.execute(httpPost);
+				status = response.getStatusLine().getStatusCode();
+				asyncResponse.resume(Response.status(status).entity(response.getEntity()).build());
+			}
+			Audit.info(log, requestInfo, status);
+
+		} catch (IOException e) {
+			log.error("connection with backend failed with exception", e);
+			responseInfo = new ResponseInfo(ResponseStatusEnum.INTERNAL_ERROR, e.getMessage());
+			Audit.error(log, requestInfo, HttpStatus.SC_INTERNAL_SERVER_ERROR);
+			asyncResponse.resume(
+					Response.status(HttpStatus.SC_INTERNAL_SERVER_ERROR).entity(responseInfo.toString()).build());
+		} finally {
+			try {
+				if (response != null) {
+					response.close();
+				}
+				backendHttpClient.close();
+			} catch (IOException e) {
+				log.error("failed to close httpClient: " + e.getMessage());
+			}
+
+		}
+
+		return responseInfo;
+
+	}
+
+	private boolean copyHeadersToRequest(List<String> requiredHeaders, HttpRequestInfo requestInfo, HttpPost httpPost) {
+		boolean allHeadersAreSet = false;
+		Map<String, String> originalHeaders = requestInfo.getHeaders();
+		for (String headerName : requiredHeaders) {
+			String headerValue = originalHeaders.get(headerName);
+			if (headerValue != null) {
+				httpPost.setHeader(headerName, headerValue);
+			} else {
+				log.error("missing required header " + headerName);
+				return allHeadersAreSet;
+			}
+		}
+		allHeadersAreSet = true;
+		return allHeadersAreSet;
+	}
+
+}