Add kubevirt API config service, expose it via REST API and CLI

Change-Id: I45a867ad54622656475758e7b4af38c19e551790
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java
new file mode 100644
index 0000000..3c09605
--- /dev/null
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.
+ */
+package org.onosproject.kubevirtnode.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.apache.commons.lang.StringUtils;
+import org.onlab.packet.IpAddress;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.kubevirtnode.api.DefaultKubevirtApiConfig;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfig;
+
+import static org.onlab.util.Tools.nullIsIllegal;
+import static org.onosproject.kubevirtnode.api.KubevirtApiConfig.Scheme.HTTPS;
+import static org.onosproject.kubevirtnode.api.KubevirtApiConfig.State.DISCONNECTED;
+
+/**
+ * KubeVirt API server config codec used for serializing and de-serializing JSON string.
+ */
+public final class KubevirtApiConfigCodec extends JsonCodec<KubevirtApiConfig> {
+
+    private static final String SCHEME = "scheme";
+    private static final String IP_ADDRESS = "ipAddress";
+    private static final String PORT = "port";
+    private static final String STATE = "state";
+    private static final String TOKEN = "token";
+    private static final String CA_CERT_DATA = "caCertData";
+    private static final String CLIENT_CERT_DATA = "clientCertData";
+    private static final String CLIENT_KEY_DATA = "clientKeyData";
+
+    private static final String MISSING_MESSAGE = " is required in KubevirtApiConfig";
+
+    @Override
+    public ObjectNode encode(KubevirtApiConfig entity, CodecContext context) {
+        ObjectNode node = context.mapper().createObjectNode()
+                .put(SCHEME, entity.scheme().name())
+                .put(IP_ADDRESS, entity.ipAddress().toString())
+                .put(PORT, entity.port())
+                .put(STATE, entity.state().name());
+
+        if (entity.scheme() == HTTPS) {
+            node.put(CA_CERT_DATA, entity.caCertData())
+                    .put(CLIENT_CERT_DATA, entity.clientCertData())
+                    .put(CLIENT_KEY_DATA, entity.clientKeyData());
+
+            if (entity.token() != null) {
+                node.put(TOKEN, entity.token());
+            }
+
+        } else {
+            if (entity.token() != null) {
+                node.put(TOKEN, entity.token());
+            }
+
+            if (entity.caCertData() != null) {
+                node.put(CA_CERT_DATA, entity.caCertData());
+            }
+
+            if (entity.clientCertData() != null) {
+                node.put(CLIENT_CERT_DATA, entity.clientCertData());
+            }
+
+            if (entity.clientKeyData() != null) {
+                node.put(CLIENT_KEY_DATA, entity.clientKeyData());
+            }
+        }
+
+        return node;
+    }
+
+    @Override
+    public KubevirtApiConfig decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        KubevirtApiConfig.Scheme scheme = KubevirtApiConfig.Scheme.valueOf(nullIsIllegal(
+                json.get(SCHEME).asText(), SCHEME + MISSING_MESSAGE));
+        IpAddress ipAddress = IpAddress.valueOf(nullIsIllegal(
+                json.get(IP_ADDRESS).asText(), IP_ADDRESS + MISSING_MESSAGE));
+        int port = json.get(PORT).asInt();
+
+        KubevirtApiConfig.Builder builder = DefaultKubevirtApiConfig.builder()
+                .scheme(scheme)
+                .ipAddress(ipAddress)
+                .port(port)
+                .state(DISCONNECTED);
+
+        JsonNode tokenJson = json.get(TOKEN);
+        JsonNode caCertDataJson = json.get(CA_CERT_DATA);
+        JsonNode clientCertDataJson = json.get(CLIENT_CERT_DATA);
+        JsonNode clientKeyDataJson = json.get(CLIENT_KEY_DATA);
+
+        String token = "";
+        String caCertData = "";
+        String clientCertData = "";
+        String clientKeyData = "";
+
+        if (scheme == HTTPS) {
+            caCertData = nullIsIllegal(caCertDataJson.asText(),
+                    CA_CERT_DATA + MISSING_MESSAGE);
+            clientCertData = nullIsIllegal(clientCertDataJson.asText(),
+                    CLIENT_CERT_DATA + MISSING_MESSAGE);
+            clientKeyData = nullIsIllegal(clientKeyDataJson.asText(),
+                    CLIENT_KEY_DATA + MISSING_MESSAGE);
+
+            if (tokenJson != null) {
+                token = tokenJson.asText();
+            }
+
+        } else {
+            if (tokenJson != null) {
+                token = tokenJson.asText();
+            }
+
+            if (caCertDataJson != null) {
+                caCertData = caCertDataJson.asText();
+            }
+
+            if (clientCertDataJson != null) {
+                clientCertData = clientCertDataJson.asText();
+            }
+
+            if (clientKeyDataJson != null) {
+                clientKeyData = clientKeyDataJson.asText();
+            }
+        }
+
+        if (StringUtils.isNotEmpty(token)) {
+            builder.token(token);
+        }
+
+        if (StringUtils.isNotEmpty(caCertData)) {
+            builder.caCertData(caCertData);
+        }
+
+        if (StringUtils.isNotEmpty(clientCertData)) {
+            builder.clientCertData(clientCertData);
+        }
+
+        if (StringUtils.isNotEmpty(clientKeyData)) {
+            builder.clientKeyData(clientKeyData);
+        }
+
+        return builder.build();
+    }
+}