Initial cps-nf-proxy-rest module setup in CPS project

Issue-ID: CPS-171
Change-Id: I8998dc2818b6bc07fc4fe25a2d735b4ab8b4b817
Signed-off-by: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>

4 files changed, 194 insertions, 0 deletions

diff --git a/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/Application.java b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/Application.java
new file mode 100644
index 0000000000..abad806e0b
--- /dev/null
+++ b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/Application.java
@@ -0,0 +1,30 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Pantheon.tech
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.nfproxy;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+    public static void main(final String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}
diff --git a/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/config/NfProxyConfig.java b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/config/NfProxyConfig.java
new file mode 100755
index 0000000000..3bdedc3631
--- /dev/null
+++ b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/config/NfProxyConfig.java
@@ -0,0 +1,44 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Pantheon.tech
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.nfproxy.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import springfox.documentation.builders.PathSelectors;
+import springfox.documentation.builders.RequestHandlerSelectors;
+import springfox.documentation.spi.DocumentationType;
+import springfox.documentation.spring.web.plugins.Docket;
+
+@Configuration
+public class NfProxyConfig {
+
+    /**
+     * Swagger-ui configuration.
+     */
+    @Bean
+    public Docket api() {
+        return new Docket(DocumentationType.OAS_30).select()
+            .apis(RequestHandlerSelectors.any())
+            .paths(PathSelectors.any())
+            .build();
+    }
+
+}
\ No newline at end of file
diff --git a/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/controller/NfProxyController.java b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/controller/NfProxyController.java
new file mode 100644
index 0000000000..8125c5aed7
--- /dev/null
+++ b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/controller/NfProxyController.java
@@ -0,0 +1,42 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Pantheon.tech
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.nfproxy.rest.controller;
+
+import org.onap.cps.nfproxy.rest.api.NfProxyApi;
+import org.onap.cps.spi.exceptions.CpsException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("${rest.api.base-path}")
+public class NfProxyController implements NfProxyApi {
+
+    @Override
+    public ResponseEntity<Object> helloWorld() {
+        return new ResponseEntity<>("Hello World!", HttpStatus.OK);
+    }
+
+    @Override
+    public ResponseEntity<Object> helloError() {
+        throw new CpsException("Example error Message", "Example error description");
+    }
+}
diff --git a/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/exceptions/NfProxyRestExceptionHandler.java b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/exceptions/NfProxyRestExceptionHandler.java
new file mode 100644
index 0000000000..96a1cb267d
--- /dev/null
+++ b/cps-nf-proxy-rest/src/main/java/org/onap/cps/nfproxy/rest/exceptions/NfProxyRestExceptionHandler.java
@@ -0,0 +1,78 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Pantheon.tech
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.nfproxy.rest.exceptions;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.exception.ExceptionUtils;
+import org.onap.cps.nfproxy.rest.controller.NfProxyController;
+import org.onap.cps.nfproxy.rest.model.ErrorMessage;
+import org.onap.cps.spi.exceptions.CpsException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+/**
+ * Exception handler with error message return.
+ */
+@Slf4j
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+@RestControllerAdvice(assignableTypes = {NfProxyController.class})
+public class NfProxyRestExceptionHandler {
+
+    /**
+     * Default exception handler.
+     *
+     * @param exception the exception to handle
+     * @return response with response code 500.
+     */
+    @ExceptionHandler
+    public static ResponseEntity<Object> handleInternalServerErrorExceptions(
+        final Exception exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception);
+    }
+
+    @ExceptionHandler({CpsException.class})
+    public static ResponseEntity<Object> handleAnyOtherCpsExceptions(final CpsException exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception.getMessage(), extractDetails(exception));
+    }
+
+    private static ResponseEntity<Object> buildErrorResponse(final HttpStatus status, final Exception exception) {
+        return buildErrorResponse(status, exception.getMessage(), ExceptionUtils.getStackTrace(exception));
+    }
+
+    private static ResponseEntity<Object> buildErrorResponse(final HttpStatus status, final String message,
+        final String details) {
+        log.error("An error has occurred : {} Status: {} Details: {}", message, status, details);
+        final ErrorMessage errorMessage = new ErrorMessage();
+        errorMessage.setStatus(status.toString());
+        errorMessage.setMessage(message);
+        errorMessage.setDetails(details);
+        return new ResponseEntity<>(errorMessage, status);
+    }
+
+    private static String extractDetails(final CpsException exception) {
+        return exception.getCause() == null
+            ? exception.getDetails()
+            : ExceptionUtils.getStackTrace(exception.getCause());
+    }
+}