Update the files for ajsc 6 changes

Issue-ID: AAI-33
Change-Id: I897566e79eb7505232b692e551f6347e69fafed6
Signed-off-by: Venkata Harish K Kajur <vk250x@att.com>

3 files changed, 373 insertions, 0 deletions

diff --git a/aai-client-loadbalancer/src/main/java/org/onap/aai/AAIRibbonConfiguration.java b/aai-client-loadbalancer/src/main/java/org/onap/aai/AAIRibbonConfiguration.java
new file mode 100644
index 00000000..4c639e44
--- /dev/null
+++ b/aai-client-loadbalancer/src/main/java/org/onap/aai/AAIRibbonConfiguration.java
@@ -0,0 +1,54 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai;
+
+import com.netflix.client.config.IClientConfig;
+import com.netflix.loadbalancer.ILoadBalancer;
+import com.netflix.loadbalancer.LoadBalancerBuilder;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * AAIRibbonConfiguration is responsible for configuring the dmaap
+ * and it reads the users the application properties class
+ * and is mostly configurable via properties
+ */
+public class AAIRibbonConfiguration {
+
+    @Autowired
+    IClientConfig ribbonClientConfig;
+
+    @Bean
+    public ILoadBalancer ribbonLoadBalancer() {
+        return LoadBalancerBuilder.newBuilder()
+                .withClientConfig(ribbonClientConfig)
+                .buildLoadBalancerFromConfigWithReflection();
+    }
+
+    @LoadBalanced
+    @Bean
+    public RestTemplate loadBalancedRestTemplate(){
+        return new RestTemplate();
+    }
+}
diff --git a/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPing.java b/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPing.java
new file mode 100644
index 00000000..4ecbfb60
--- /dev/null
+++ b/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPing.java
@@ -0,0 +1,68 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.config;
+
+import java.util.Optional;
+
+/**
+ * <b>HttpPing</b> interface provides access to update the endpoint and
+ * and the security level of the server that the user is trying to access
+ */
+public interface HttpPing {
+
+    /**
+     * Sets the endpoint that the http get request will
+     * make to verify if the url can be reached
+     *
+     * @param endpoint - the endpoint of the url that is used to do healthcheck
+     */
+    void setHealthCheckEndpoint(String endpoint);
+
+    /**
+     * Returns the health check endpoint that the implementation
+     * will use in order to verify if the server is reachable at that location
+     *
+     * @return endpoint - the endpoint of the url that is used to do healthcheck
+     */
+    String getHealthCheckEndpoint();
+
+    /**
+     * Set the credentials for the rest endpoint to verify authorization
+     *
+     * @param username - the username to the server trying to connect to
+     * @param password - the password to the server trying to connect to
+     */
+    void setCredentials(String username, String password);
+
+    /**
+     * Return the base64 authorization string set from the username and password
+     *
+     * @return encoded string using base64 of the username and password values
+     * like this:
+     * <pre>
+     * @{code
+     *      "username:password" => "Basic dXNlcm5hbWU6cGFzc3dvcmQ="
+     * }
+     * </pre>
+     */
+    Optional<String> getAuthorization();
+}
diff --git a/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPingImpl.java b/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPingImpl.java
new file mode 100644
index 00000000..2e5804eb
--- /dev/null
+++ b/aai-client-loadbalancer/src/main/java/org/onap/aai/config/HttpPingImpl.java
@@ -0,0 +1,251 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 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=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.config;
+
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+import com.netflix.client.config.DefaultClientConfigImpl;
+import com.netflix.client.config.IClientConfig;
+import com.netflix.loadbalancer.IPing;
+import com.netflix.loadbalancer.Server;
+import org.springframework.http.*;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.client.RestTemplate;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.util.Base64;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Optional;
+
+public class HttpPingImpl implements HttpPing, IPing {
+
+    private static final EELFLogger logger = EELFManager.getInstance().getLogger(HttpPingImpl.class);
+
+    private static final Base64.Encoder base64Encoder = Base64.getEncoder();
+
+    private static final HttpHeaders HTTP_HEADERS = new HttpHeaders();
+
+    // This is a workaround for the topics that the user
+    // does not have the access to read their own topic status
+    private static final String MR_STATUS_PATTERN = ".*\"mrstatus\":\\s*4002.*";
+
+    private static final int HTTPS_PORT = 3905;
+    private static final int DEFAULT_TIMEOUT = 2;
+
+    private String healthCheckEndpoint;
+    private String username;
+    private String password;
+
+    private int timeout;
+
+    private final RestTemplate restTemplate;
+
+    public HttpPingImpl(String healthCheckEndpoint) {
+        this(new RestTemplate());
+        this.healthCheckEndpoint = healthCheckEndpoint;
+        this.timeout = DEFAULT_TIMEOUT;
+    }
+
+    public HttpPingImpl(RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+        this.healthCheckEndpoint = "";
+        this.timeout = DEFAULT_TIMEOUT;
+    }
+
+    public HttpPingImpl() {
+        this("");
+    }
+
+    public HttpPingImpl(IClientConfig clientConfig) {
+
+        if (!(clientConfig instanceof DefaultClientConfigImpl)) {
+            throw new UnsupportedOperationException("Unable to support the client config implementation: " + clientConfig.getClass().getName());
+        }
+
+        DefaultClientConfigImpl defaultClientConfig = (DefaultClientConfigImpl) clientConfig;
+
+        Map<String, Object> map = defaultClientConfig.getProperties();
+
+        this.setCredentials(map.get("username").toString(), map.get("password").toString());
+        this.setHealthCheckEndpoint(map.get("health.endpoint").toString());
+        this.setTimeoutInSecs(Integer.valueOf(map.get("pingport.timeout").toString()));
+
+        this.restTemplate = new RestTemplate();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setHealthCheckEndpoint(String endpoint) {
+        this.healthCheckEndpoint = endpoint;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String getHealthCheckEndpoint() {
+        return healthCheckEndpoint;
+    }
+
+    @Override
+    public void setCredentials(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+
+    public void setTimeoutInSecs(int timeout) {
+        this.timeout = timeout;
+    }
+
+    @Override
+    public Optional<String> getAuthorization() {
+
+        if (username == null && password == null) {
+            return Optional.empty();
+        }
+
+        if (username == null || username.isEmpty()) {
+            logger.error("Username is null while the password is not correctly set");
+            return Optional.empty();
+        }
+
+        if (password == null || password.isEmpty()) {
+            logger.error("Password is null while the username is not correctly set");
+            return Optional.empty();
+        }
+
+        String auth = String.format("%s:%s", username, password);
+        return Optional.ofNullable("Basic " + base64Encoder.encodeToString(auth.getBytes()));
+    }
+
+    /**
+     * @{inheritDoc}
+     */
+    @Override
+    public boolean isAlive(Server server) {
+
+        String url = null;
+
+        // If unable to ping the port then return immediately
+        if (!pingPort(server)) {
+            return false;
+        }
+
+        if (server.getPort() == HTTPS_PORT) {
+            url = "https://";
+        } else {
+
+            url = "http://";
+        }
+
+        url = url + server.getId();
+        url = url + this.getHealthCheckEndpoint();
+
+        boolean isAlive = false;
+
+        Optional<String> authorization = getAuthorization();
+
+        HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
+
+        if (authorization.isPresent()) {
+            httpHeaders.add("Authorization", authorization.get());
+        }
+
+        HttpEntity<String> httpEntity = new HttpEntity<>(httpHeaders);
+        try {
+
+            ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.GET, httpEntity, String.class);
+
+            HttpStatus httpStatus = responseEntity.getStatusCode();
+
+            if (httpStatus == HttpStatus.OK) {
+                isAlive = true;
+                logger.info("Successfully established connection to the following url {}", url);
+                return isAlive;
+            }
+
+            logger.warn("Unable to establish a connection the following url {} due to HTTP Code {}, and reason {}",
+                    url, httpStatus.value(), httpStatus.getReasonPhrase());
+
+        } catch (HttpClientErrorException ex) {
+            HttpStatus httpStatus = ex.getStatusCode();
+            if (httpStatus == HttpStatus.FORBIDDEN) {
+                // This is a workaround being in play for the topics
+                // that are unable to read themselves for this user
+                // In the case of the username and password being
+                // wrong the response would be unauthorized (401) but if the
+                // user is authorized but unable to read this topic, then
+                // we get back the (403) with the message mrstatus 4002
+                // This is a temporary workaround to properly identify which server is down
+                String body = ex.getResponseBodyAsString();
+                if (body.matches(MR_STATUS_PATTERN)) {
+                    isAlive = true;
+                    logger.info("Successfully connected by workaround due to unable to read own topic {}", url);
+                    return isAlive;
+                } else {
+                    logger.warn("Unable to establish a connection to {} due to {}", server.getHostPort(), ex.getMessage());
+                }
+            } else {
+                logger.warn("Unable to establish a connection to {} due to {}", server.getHostPort(), ex.getMessage());
+            }
+        } catch (Exception ex) {
+            logger.warn("Unable to establish a connection to {} due to {}", server.getHostPort(), ex.getMessage());
+        }
+
+        return isAlive;
+    }
+
+    /**
+     * Returns true if it can connect to the host and port within
+     * the given timeout from the given server parameter
+     *
+     * @param server - server that will be taken from the src/main/resources/application.yml file
+     * @return true if it can make a successful socket connection to the port on the host
+     */
+    public boolean pingPort(Server server) {
+
+        String host = server.getHost();
+        Integer port = server.getPort();
+
+        boolean success = false;
+        SocketAddress socketAddress = new InetSocketAddress(host, port);
+
+        try (Socket socket = new Socket()) {
+            socket.connect(socketAddress, timeout * 1000);
+            if (socket.isConnected()) {
+                success = true;
+            }
+        } catch (IOException e) {
+            logger.warn("Unable to connect to the host {} on port {} due to {}", host, port, e.getLocalizedMessage());
+            success = false;
+        }
+
+        return success;
+    }
+}