Generic REST client for external services

Initial commit for generic REST client for requests to another components APIs

Change-Id: I4af29ab1e45fd805403622e60585a351f3ef5d20
Issue-ID: VID-266
Signed-off-by: tgolabek <tomasz.golabek@nokia.com>

1 files changed, 228 insertions, 0 deletions

diff --git a/vid-app-common/src/main/java/org/onap/vid/client/SyncRestClient.java b/vid-app-common/src/main/java/org/onap/vid/client/SyncRestClient.java
new file mode 100644
index 000000000..84e83e8b2
--- /dev/null
+++ b/vid-app-common/src/main/java/org/onap/vid/client/SyncRestClient.java
@@ -0,0 +1,228 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * VID
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. 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.onap.vid.client;
+
+import io.joshworks.restclient.http.HttpResponse;
+import io.joshworks.restclient.http.JsonNode;
+import io.joshworks.restclient.http.RestClient;
+import io.joshworks.restclient.http.mapper.ObjectMapper;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
+import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
+import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
+import org.eclipse.jetty.util.security.Password;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.conn.ssl.SSLContexts;
+import io.vavr.CheckedFunction1;
+import lombok.SneakyThrows;
+import lombok.val;
+
+import java.security.UnrecoverableKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.KeyManagementException;
+import java.security.cert.CertificateException;
+import javax.net.ssl.SSLHandshakeException;
+import java.security.KeyStoreException;
+import java.text.SimpleDateFormat;
+import javax.net.ssl.SSLContext;
+import java.io.FileInputStream;
+import java.security.KeyStore;
+import java.text.DateFormat;
+import java.io.InputStream;
+import java.io.IOException;
+import java.util.Date;
+import java.util.Map;
+import java.io.File;
+import org.onap.portalsdk.core.util.SystemProperties;
+import org.onap.vid.properties.VidProperties;
+
+public class SyncRestClient implements SyncRestClientInterface {
+
+    private static final String CANNOT_INITIALIZE_CUSTOM_HTTP_CLIENT = "Cannot initialize custom http client from current configuration. Using default one.";
+    private static final String TRY_TO_CALL_OVER_HTTP = "SSL Handshake problem occured. Will try to retry over Http.";
+    private static final EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(SyncRestClient.class);
+    private static final DateFormat DATE_FORMAT = new SimpleDateFormat("HH:mm:ss:SSSS");
+    private static final String[] SUPPORTED_SSL_VERSIONS = {"TLSv1", "TLSv1.2"};
+    private static final String HTTPS_SCHEMA = "https://";
+    private static final String HTTP_SCHEMA = "http://";
+
+    private RestClient restClient;
+
+    public SyncRestClient() {
+        restClient = RestClient.newClient().objectMapper(defaultObjectMapper()).httpClient(defaultHttpClient()).build();
+    }
+
+    public SyncRestClient(ObjectMapper objectMapper) {
+        restClient = RestClient.newClient().objectMapper(objectMapper).httpClient(defaultHttpClient()).build();
+    }
+
+    public SyncRestClient(CloseableHttpClient httpClient) {
+        restClient = RestClient.newClient().objectMapper(defaultObjectMapper()).httpClient(httpClient).build();
+    }
+
+    public SyncRestClient(CloseableHttpClient httpClient, ObjectMapper objectMapper) {
+        restClient = RestClient.newClient().objectMapper(objectMapper).httpClient(httpClient).build();
+    }
+
+    @Override
+    public HttpResponse<JsonNode> post(String url, Map<String, String> headers, Object body) {
+        return callWithRetryOverHttp(url, url2 -> restClient.post(url2).headers(headers).body(body).asJson());
+    }
+
+    @Override
+    public <T> HttpResponse<T> post(String url, Map<String, String> headers, Object body, Class<T> responseClass) {
+        return callWithRetryOverHttp(url,
+            url2 -> restClient.post(url2).headers(headers).body(body).asObject(responseClass));
+    }
+
+    @Override
+    public HttpResponse<JsonNode> get(String url, Map<String, String> headers, Map<String, String> routeParams) {
+        return callWithRetryOverHttp(url, url2 -> {
+            val getRequest = restClient.get(url2).headers(headers);
+            routeParams.forEach(getRequest::routeParam);
+            return getRequest.asJson();
+        });
+    }
+
+    @Override
+    public <T> HttpResponse<T> get(String url, Map<String, String> headers, Map<String, String> routeParams,
+        Class<T> responseClass) {
+        return callWithRetryOverHttp(url, url2 -> {
+            val getRequest = restClient.get(url2).headers(headers);
+            routeParams.forEach(getRequest::routeParam);
+            return getRequest.asObject(responseClass);
+        });
+    }
+
+    @Override
+    public HttpResponse<InputStream> getStream(String url, Map<String, String> headers,
+        Map<String, String> routeParams) {
+        return callWithRetryOverHttp(url, url2 -> {
+            val getRequest = restClient.get(url2).headers(headers);
+            routeParams.forEach(getRequest::routeParam);
+            return getRequest.asBinary();
+        });
+    }
+
+    @Override
+    public HttpResponse<JsonNode> put(String url, Map<String, String> headers, Object body) {
+        return callWithRetryOverHttp(url, url2 -> restClient.put(url2).headers(headers).body(body).asJson());
+    }
+
+    @Override
+    public <T> HttpResponse<T> put(String url, Map<String, String> headers, Object body, Class<T> responseClass) {
+        return callWithRetryOverHttp(url,
+            url2 -> restClient.put(url2).headers(headers).body(body).asObject(responseClass));
+    }
+
+    @Override
+    public <T> HttpResponse<T> delete(String url, Map<String, String> headers, Class<T> responseClass) {
+        return callWithRetryOverHttp(url, url2 -> restClient.delete(url2).headers(headers).asObject(responseClass));
+    }
+
+    @Override
+    public HttpResponse<JsonNode> delete(String url, Map<String, String> headers) {
+        return callWithRetryOverHttp(url, url2 -> restClient.delete(url2).headers(headers).asJson());
+    }
+
+    @Override
+    public void destroy() {
+        restClient.shutdown();
+    }
+
+    @SneakyThrows
+    private <T> HttpResponse<T> callWithRetryOverHttp(String url,
+        CheckedFunction1<String, HttpResponse<T>> httpRequest) {
+        try {
+            return httpRequest.apply(url);
+        } catch (Exception e) {
+            if (e.getCause() instanceof SSLHandshakeException) {
+                logger.warn(EELFLoggerDelegate.debugLogger,
+                    DATE_FORMAT.format(new Date()) + TRY_TO_CALL_OVER_HTTP, e);
+                return httpRequest.apply(url.replaceFirst(HTTPS_SCHEMA, HTTP_SCHEMA));
+            }
+            throw e;
+        }
+    }
+
+    private ObjectMapper defaultObjectMapper() {
+        val objectMapper = new org.codehaus.jackson.map.ObjectMapper();
+
+        return new ObjectMapper() {
+            @Override
+            @SneakyThrows
+            public <T> T readValue(String value, Class<T> aClass) {
+                return objectMapper.readValue(value, aClass);
+            }
+
+            @Override
+            @SneakyThrows
+            public String writeValue(Object value) {
+                return objectMapper.writeValueAsString(value);
+            }
+        };
+    }
+
+    private CloseableHttpClient defaultHttpClient() {
+        try {
+            val trustStorePath = SystemProperties.getProperty(VidProperties.VID_TRUSTSTORE_FILENAME);
+            val trustStorePass = SystemProperties.getProperty(VidProperties.VID_TRUSTSTORE_PASSWD_X);
+            val decryptedTrustStorePass = Password.deobfuscate(trustStorePass);
+
+            val trustStore = loadTruststore(trustStorePath, decryptedTrustStorePass);
+            val sslContext = trustOwnCACerts(decryptedTrustStorePass, trustStore);
+            val sslSf = allowTLSProtocols(sslContext);
+
+            return HttpClients.custom().setSSLSocketFactory(sslSf).build();
+        } catch (IOException | CertificateException | UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException | KeyManagementException e) {
+            logger.warn(EELFLoggerDelegate.debugLogger,
+                DATE_FORMAT.format(new Date()) + CANNOT_INITIALIZE_CUSTOM_HTTP_CLIENT, e);
+            return HttpClients.createDefault();
+        }
+    }
+
+    private SSLConnectionSocketFactory allowTLSProtocols(SSLContext sslcontext) {
+        return new SSLConnectionSocketFactory(
+            sslcontext,
+            SUPPORTED_SSL_VERSIONS,
+            null,
+            SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
+    }
+
+    private SSLContext trustOwnCACerts(String trustStorePass, KeyStore trustStore)
+        throws NoSuchAlgorithmException, KeyManagementException, KeyStoreException, UnrecoverableKeyException {
+        return SSLContexts.custom()
+            .useTLS()
+            .loadKeyMaterial(trustStore, trustStorePass.toCharArray())
+            .loadTrustMaterial(trustStore, new TrustSelfSignedStrategy())
+            .build();
+    }
+
+    private KeyStore loadTruststore(String trustStorePath, String trustStorePass)
+        throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
+        val trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
+        try (FileInputStream instream = new FileInputStream(new File(trustStorePath))) {
+            trustStore.load(instream, trustStorePass.toCharArray());
+        }
+        return trustStore;
+    }
+
+}