Initial drop of rProxy code

The Reverse Proxy sidecar is used to separate the responsibility of
authentication and authorization away from the primary microservice. In
conjunction with the Forward Proxy sidecar, it is responsible for
controlling access to the REST URL endpoints exposed by the primary
microservice, and propogating security credentials to downstream
microservices.

Change-Id: I5d80429e5422d7b3937cde73ac10c2ec00d264e8
Issue-ID: AAI-1604
Signed-off-by: Lee, Tian (tl5884) <TianL@amdocs.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/sidecar/rproxy/src/main/java/org/onap/aaf/rproxy/ReverseProxyService.java b/sidecar/rproxy/src/main/java/org/onap/aaf/rproxy/ReverseProxyService.java
new file mode 100644
index 0000000..b5c000c
--- /dev/null
+++ b/sidecar/rproxy/src/main/java/org/onap/aaf/rproxy/ReverseProxyService.java
@@ -0,0 +1,166 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aaf
+ * ================================================================================
+ * Copyright © 2018 European Software Marketing Ltd.
+ * ================================================================================
+ * 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.onap.aaf.rproxy;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Enumeration;
+import java.util.UUID;
+import javax.annotation.Resource;
+import javax.servlet.http.HttpServletRequest;
+import org.onap.aaf.fproxy.data.CredentialCacheData;
+import org.onap.aaf.fproxy.data.CredentialCacheData.CredentialType;
+import org.onap.aaf.rproxy.config.ForwardProxyProperties;
+import org.onap.aaf.rproxy.config.PrimaryServiceProperties;
+import org.onap.aaf.rproxy.logging.ReverseProxyMethodLogTimeAnnotation;
+import org.onap.aaf.rproxy.utils.ReverseProxyUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.actuate.endpoint.InvalidEndpointRequestException;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+@RestController
+@EnableConfigurationProperties({ForwardProxyProperties.class, PrimaryServiceProperties.class})
+public class ReverseProxyService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ReverseProxyService.class);
+
+    private String validatedTransactionId;
+
+    @Resource(name = "ForwardProxyProperties")
+    private ForwardProxyProperties forwardProxyProperties;
+
+    @Resource(name = "PrimaryServiceProperties")
+    private PrimaryServiceProperties primaryServiceProperties;
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @Value("${transactionid.header.name}")
+    private String transactionIdHeader;
+
+    @RequestMapping("/**")
+    @ReverseProxyMethodLogTimeAnnotation
+    public ResponseEntity<String> handleRequest(HttpServletRequest request,
+            @RequestHeader(value = "${transactionid.header.name}", defaultValue = "") String transactionId,
+            @RequestBody(required = false) String requestBody, HttpMethod requestMethod) throws URISyntaxException {
+        validatedTransactionId = getValidTransactionId(transactionId);
+
+        // Extract Request Permissions and store in Forward Proxy cache
+        CredentialCacheData credentialCacheData = getCredentialDataFromRequest(request);
+        if (credentialCacheData != null) {
+            postCredentialsToCache(credentialCacheData);
+        }
+
+        // Call out to Primary Service & Return Response
+        URI requestURI = new URI(request.getRequestURI());
+
+        LOGGER.debug("Request URI: {}", request.getRequestURI());
+
+        // Get Request Endpoint & substitute in local values
+        URI primaryServiceURI = new URI(primaryServiceProperties.getProtocol(), requestURI.getUserInfo(),
+                primaryServiceProperties.getHost(), Integer.parseInt(primaryServiceProperties.getPort()),
+                requestURI.getPath(), requestURI.getQuery(), requestURI.getFragment());
+
+        LOGGER.debug("Primary Service URI:{}, HTTP Method: {}", primaryServiceURI, requestMethod);
+
+        HttpHeaders requestHeaders = setForwardedRequestHeaders(request);
+        HttpEntity<String> httpEntity = new HttpEntity<>(requestBody, requestHeaders);
+
+        return restTemplate.exchange(primaryServiceURI, requestMethod, httpEntity, String.class);
+    }
+
+    private String getValidTransactionId(String transactionId) {
+        LOGGER.debug("Request transaction ID: {}", transactionId);
+        if (transactionId == null || !ReverseProxyUtils.validTransactionId(transactionId)) {
+            transactionId = UUID.randomUUID().toString();
+        }
+        LOGGER.debug("Validated transaction ID: {}", transactionId);
+        return transactionId;
+    }
+
+    private HttpHeaders setForwardedRequestHeaders(HttpServletRequest httpServletRequest) {
+        HttpHeaders httpHeaders = new HttpHeaders();
+        Enumeration<String> headerNames = httpServletRequest.getHeaderNames();
+        while (headerNames.hasMoreElements()) {
+            String headerName = headerNames.nextElement();
+            if (!headerName.equals(transactionIdHeader)) {
+                httpHeaders.set(headerName, httpServletRequest.getHeader(headerName));
+            }
+        }
+        // Always set transaction ID
+        httpHeaders.set(transactionIdHeader, validatedTransactionId);
+
+        return httpHeaders;
+    }
+
+    /**
+     * Retrieves credential data from request.
+     * 
+     * @param request The request to retrieve credentials from
+     * @return The retrieved credential data, or null if no credentials are found in request
+     */
+    private CredentialCacheData getCredentialDataFromRequest(HttpServletRequest request) {
+        CredentialCacheData credentialCacheData = null;
+        String authValue = request.getHeader(HttpHeaders.AUTHORIZATION);
+        if (authValue != null) {
+            credentialCacheData = new CredentialCacheData(HttpHeaders.AUTHORIZATION, authValue, CredentialType.HEADER);
+        }
+        return credentialCacheData;
+    }
+
+    /**
+     * Posts credential data to credential cache endpoint
+     * 
+     * @param credentialCacheData The credential data to post
+     * @throws URISyntaxException
+     */
+    private void postCredentialsToCache(CredentialCacheData credentialCacheData) throws URISyntaxException {
+        URI forwardProxyURI = new URI(forwardProxyProperties.getProtocol(), null, forwardProxyProperties.getHost(),
+                forwardProxyProperties.getPort(), forwardProxyProperties.getCacheurl() + "/" + validatedTransactionId,
+                null, null);
+
+        ResponseEntity<String> response =
+                restTemplate.postForEntity(forwardProxyURI, credentialCacheData, String.class);
+
+        if (!response.getStatusCode().is2xxSuccessful()) {
+            throw new InvalidEndpointRequestException("Error posting to credential cache.",
+                    "Status code: " + response.getStatusCodeValue() + " Message: " + response.getBody());
+        }
+    }
+
+    @Override
+    public String toString() {
+        return this.getClass().getName() + ": Forward proxy host:" + forwardProxyProperties.getHost()
+                + ": Primary service host:" + primaryServiceProperties.getHost();
+
+    }
+}