initial commit for CDT proxy Service

Initial commit for CDT proxy server to fix CORS Issues.

Issue-ID: APPC-885
Change-Id: Idf2688dbca3fd6c25636544147ed5b23a5a4ed7f
Signed-off-by: Kumar, Amaresh (ak583p) <ak583p@us.att.com>

10 files changed, 707 insertions, 0 deletions

diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/MainApplication.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/MainApplication.java
new file mode 100644
index 0000000..c160519
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/MainApplication.java
@@ -0,0 +1,79 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service;
+
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.converter.StringHttpMessageConverter;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+
+@EnableAutoConfiguration
+@Configuration
+@ComponentScan
+public class MainApplication {
+
+    public static void main(String args[]) {
+        SpringApplication.run(MainApplication.class, args);
+    }
+
+    @Bean
+    public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
+        MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
+        jsonConverter.setObjectMapper(objectMapper);
+        return jsonConverter;
+    }
+
+    @Bean
+    public StringHttpMessageConverter stringHttpMessageConverter() {
+        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
+        stringHttpMessageConverter.setWriteAcceptCharset(true);
+         return stringHttpMessageConverter;
+    }
+
+    @Bean
+    public WebMvcConfigurer corsConfigurer() {
+        return new WebMvcConfigurerAdapter() {
+            @Override
+            public void addCorsMappings(CorsRegistry registry) {
+                registry.addMapping("/**")
+                        .allowedOrigins("*")
+                        .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE");
+            }
+        };
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/SwaggerConfig.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/SwaggerConfig.java
new file mode 100644
index 0000000..f9630a6
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/SwaggerConfig.java
@@ -0,0 +1,60 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import springfox.documentation.builders.ApiInfoBuilder;
+import springfox.documentation.builders.PathSelectors;
+import springfox.documentation.builders.RequestHandlerSelectors;
+import springfox.documentation.service.ApiInfo;
+import springfox.documentation.spi.DocumentationType;
+import springfox.documentation.spring.web.plugins.Docket;
+import springfox.documentation.swagger2.annotations.EnableSwagger2;
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+@Configuration
+@EnableSwagger2
+public class SwaggerConfig {
+    @Bean
+    public Docket api() {
+        return new Docket(DocumentationType.SWAGGER_2)
+                .apiInfo(getApiInfo())
+                .select()
+                .apis(RequestHandlerSelectors.basePackage("org.onap.appc.cdt.service.controller"))
+                .paths(PathSelectors.any())
+                .build();
+    }
+
+    private ApiInfo getApiInfo() {
+
+        return new ApiInfoBuilder()
+                .title("VNF Lifecycle Tetsing Api Doc")
+                .description("Developer API Reference guide for devlopong VNF lifecylye testing")
+                .version("1.0.0")
+                .license("Apache 2.0")
+                .licenseUrl("http://www.apache.org/licenses/LICENSE-2.0")
+                .contact("kamaresh@in.ibm.com")
+                .build();
+    }
+}
\ No newline at end of file
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/controller/CdtController.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/controller/CdtController.java
new file mode 100644
index 0000000..78a94f6
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/controller/CdtController.java
@@ -0,0 +1,169 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.controller;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import io.swagger.annotations.ApiResponse;
+import io.swagger.annotations.ApiResponses;
+import org.apache.http.client.HttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.client.RestTemplate;
+
+import java.net.UnknownHostException;
+import java.util.Base64;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+
+@RestController
+@RequestMapping("/cdtService")
+@CrossOrigin(origins = "*", allowedHeaders = "*")
+@Api(value = "cdtService", description = "Backend service to eliminate CORS issue for CDT Tool")
+public class CdtController {
+
+    private static final Logger logger = LoggerFactory.getLogger(CdtController.class);
+    private RestTemplate restTemplate = new RestTemplate();
+    private String urlAddress;
+
+    @Value("${restConf.backend.hostname}")
+    private String restConfHostname;
+
+    @Value("${restConf.backend.port}")
+    private String restConfPort;
+
+    @Value("${restConf.username}")
+    private String restConfUsername;
+
+    @Value("${restConf.password}")
+    private String restConfPassword;
+
+    @ApiOperation(value = "Return All Test Data for a given user", response = CdtController.class)
+    @ApiResponses(value = {
+            @ApiResponse(code = 200, message = "OK"),
+            @ApiResponse(code = 404, message = "The resource not found")
+    })
+    @RequestMapping(value = "", method = RequestMethod.GET)
+    @CrossOrigin(origins = "*", allowedHeaders = "*")
+    public String DefaultEndpoint()  {
+        return  "CDT Proxy Service is up and running.";
+
+    }
+
+    @ApiOperation(value = "Return All Test Data for a given user", response = CdtController.class)
+    @ApiResponses(value = {
+            @ApiResponse(code = 200, message = "OK"),
+            @ApiResponse(code = 404, message = "The resource not found")
+    })
+    @RequestMapping(value = "/getDesigns", method = RequestMethod.POST)
+    @CrossOrigin(origins = "*", allowedHeaders = "*")
+    public String getDesigns(@RequestBody String getDesignsRequest) throws UnknownHostException {
+        HttpEntity<String> entity = getStringHttpEntity(getDesignsRequest);
+        HttpClient httpClient = HttpClientBuilder.create().build();
+        ClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
+        restTemplate.setRequestFactory(factory);
+        String getDesignsResponse = restTemplate.postForObject(getUrl("getDesigns"), entity, String.class);
+        return getDesignsResponse;
+    }
+
+    @ApiOperation(value = "Test VNF", response = CdtController.class)
+    @ApiResponses(value = {
+            @ApiResponse(code = 200, message = "OK"),
+            @ApiResponse(code = 404, message = "The resource not found")
+    })
+    @RequestMapping(value = "/testVnf", method = RequestMethod.POST)
+    @CrossOrigin(origins = "*", allowedHeaders = "*")
+    public String testVnf(@RequestParam String urlAction, @RequestBody String testVnf) throws UnknownHostException {
+        HttpEntity<String> entity = getStringHttpEntity(testVnf);
+        String testVnfResponse = restTemplate.postForObject(getUrl("testVnf")+urlAction, entity, String.class);
+        return testVnfResponse;
+    }
+
+    @ApiOperation(value = "Check status of submitted Test", response = CdtController.class)
+    @ApiResponses(value = {
+            @ApiResponse(code = 200, message = "OK"),
+            @ApiResponse(code = 404, message = "The resource not found")
+    })
+    @RequestMapping(value = "/checkTestStatus", method = RequestMethod.POST)
+    @CrossOrigin(origins = "*", allowedHeaders = "*")
+    public String checkTestStatus(@RequestBody String checkTestStatusRequest) throws UnknownHostException {
+        HttpEntity<String> entity = getStringHttpEntity(checkTestStatusRequest);
+        String checkTestStatusResponse = restTemplate.postForObject(getUrl("checkTestStatus"), entity, String.class);
+        return checkTestStatusResponse;
+    }
+
+    @ApiOperation(value = "Validate a template which is being uploaded", response = CdtController.class)
+    @ApiResponses(value = {
+            @ApiResponse(code = 200, message = "OK"),
+            @ApiResponse(code = 404, message = "The resource not found")
+    })
+    @RequestMapping(value = "/validateTemplate", method = RequestMethod.POST)
+    @CrossOrigin(origins = "*", allowedHeaders = "*")
+    public String validateTemplate(@RequestBody String validateTemplateRequest) throws UnknownHostException {
+        HttpEntity<String> entity = getStringHttpEntity(validateTemplateRequest);
+        String validateTemplateResponse = restTemplate.postForObject(getUrl("validateTemplate"), entity, String.class);
+        return validateTemplateResponse;
+    }
+
+    private HttpEntity<String> getStringHttpEntity(@RequestBody String getDesignsRequest) {
+        HttpHeaders headers = new HttpHeaders();
+        headers.setAccessControlAllowCredentials(true);
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        String planCredentials = restConfUsername + ":" + restConfPassword;
+        String base64Credentails = Base64.getEncoder().encodeToString(planCredentials.getBytes());
+        headers.set("Authorization", "Basic " + base64Credentails);
+        return new HttpEntity<String>(getDesignsRequest, headers);
+    }
+
+    private String getUrl(String ApiName) throws UnknownHostException {
+
+        switch (ApiName) {
+            case "getDesigns":
+                urlAddress = "http://" + restConfHostname + ":" + restConfPort + "/restconf/operations/design-services:dbservice";
+                break;
+            case "testVnf":
+                urlAddress = "http://" + restConfHostname + ":" + restConfPort + "/restconf/operations/appc-provider-lcm:";
+                break;
+            case "checkTestStatus":
+                urlAddress = "http://" + restConfHostname + ":" + restConfPort + "/restconf/operations/appc-provider-lcm:action-status";
+                break;
+            case "validateTemplate":
+                urlAddress = "http://" + restConfHostname + ":" + restConfPort + "/restconf/operations/design-services:validator";
+                break;
+            default:
+                logger.error("URI not resolved because Api call not supported ");
+        }
+        logger.info("Calling Endpoint..... " + urlAddress);
+        return urlAddress;
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/DesignRequest.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/DesignRequest.java
new file mode 100644
index 0000000..e3e5fb8
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/DesignRequest.java
@@ -0,0 +1,58 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.domain;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+public class DesignRequest {
+    private String requestId;
+    private String action;
+    private Payload payload;
+
+    public DesignRequest() {
+    }
+
+    public String getRequestId() {
+        return requestId;
+    }
+
+    public void setRequestId(String requestId) {
+        this.requestId = requestId;
+    }
+
+    public String getAction() {
+        return action;
+    }
+
+    public void setAction(String action) {
+        this.action = action;
+    }
+
+    public Payload getPayload() {
+        return payload;
+    }
+
+    public void setPayload(Payload payload) {
+        this.payload = payload;
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/GetDesignRequest.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/GetDesignRequest.java
new file mode 100644
index 0000000..4e57a28
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/GetDesignRequest.java
@@ -0,0 +1,41 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.domain;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+public class GetDesignRequest {
+    private Input input;
+
+    public GetDesignRequest() {
+
+    }
+
+    public Input getInput() {
+        return input;
+    }
+
+    public void setInput(Input input) {
+        this.input = input;
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Input.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Input.java
new file mode 100644
index 0000000..1be4453
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Input.java
@@ -0,0 +1,42 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.domain;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+public class Input {
+    private DesignRequest designRequest;
+
+    public Input() {
+
+    }
+
+    public DesignRequest getDesignRequest() {
+        return designRequest;
+    }
+
+    public void setDesignRequest(DesignRequest designRequest) {
+        this.designRequest = designRequest;
+    }
+}
+
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Payload.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Payload.java
new file mode 100644
index 0000000..4e85fc0
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/domain/Payload.java
@@ -0,0 +1,68 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.domain;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+public class Payload {
+
+    private String userId;
+    private String vnfType;
+    private String artifactType = "APPC-CONFIG";
+    private String artifactName;
+
+    public Payload() {
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public String getVnfType() {
+        return vnfType;
+    }
+
+    public void setVnfType(String vnfType) {
+        this.vnfType = vnfType;
+    }
+
+    public String getArtifactType() {
+        return artifactType;
+    }
+
+    public void setArtifactType(String artifactType) {
+        this.artifactType = artifactType;
+    }
+
+    public String getArtifactName() {
+        return artifactName;
+    }
+
+    public void setArtifactName(String artifactName) {
+        this.artifactName = artifactName;
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ApiError.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ApiError.java
new file mode 100644
index 0000000..07fadcc
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ApiError.java
@@ -0,0 +1,65 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.exceptions;
+
+import org.springframework.http.HttpStatus;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+public class ApiError {
+
+    private HttpStatus Status;
+    private String message;
+    private String detailedMessage;
+
+
+    public ApiError(HttpStatus status, String detailedMessage, String message) {
+        Status = status;
+        this.detailedMessage = detailedMessage;
+        this.message = message;
+    }
+
+    public HttpStatus getStatus() {
+        return Status;
+    }
+
+    public void setStatus(HttpStatus status) {
+        Status = status;
+    }
+
+    public String getDetailedMessage() {
+        return detailedMessage;
+    }
+
+    public void setDetailedMessage(String detailedMessage) {
+        this.detailedMessage = detailedMessage;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/GlobalExceptionHandler.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/GlobalExceptionHandler.java
new file mode 100644
index 0000000..3995860
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/GlobalExceptionHandler.java
@@ -0,0 +1,74 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.exceptions;
+
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.client.ResourceAccessException;
+import org.springframework.web.context.request.WebRequest;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.net.UnknownHostException;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+@ControllerAdvice
+public class GlobalExceptionHandler {
+    private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
+
+    @ExceptionHandler(UnknownHostException.class)
+    public String handleSQLException(HttpServletRequest request, Exception ex) {
+        logger.info("UnknownHostException Occured:: URL=" + request.getRequestURL());
+        return "Host not found";
+    }
+
+    @ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "IOException occured")
+    @ExceptionHandler(IOException.class)
+    public void handleIOException() {
+        logger.error("IOException handler executed");
+    }
+
+    @ResponseStatus(value = HttpStatus.GATEWAY_TIMEOUT, reason = "Cannot access restconf URl")
+    @ExceptionHandler(ResourceAccessException.class)
+    public void handleResourceAccessException() {
+        logger.error("IOException handler executed");
+    }
+
+    @ExceptionHandler(value = {ResourceNotFoundException.class})
+    protected ResponseEntity<Object> handleResourceNotFoundExceptionException(ResourceNotFoundException ex, WebRequest request) {
+        StringBuilder builder = new StringBuilder();
+        builder.append(ex.getMessage());
+        ApiError apiError = new ApiError(HttpStatus.NOT_FOUND,
+                "Resource Doesnt Exists.", builder.substring(0, builder.length()));
+        return new ResponseEntity<Object>(apiError, new HttpHeaders(), apiError.getStatus());
+    }
+
+}
diff --git a/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ResourceNotFoundException.java b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ResourceNotFoundException.java
new file mode 100644
index 0000000..7ef5b62
--- /dev/null
+++ b/CdtProxyService/src/main/java/org/onap/appc/cdt/service/exceptions/ResourceNotFoundException.java
@@ -0,0 +1,51 @@
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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.appc.cdt.service.exceptions;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * Created by Amaresh Kumar on 09/May/2018.
+ */
+@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "Resource Not Found")
+public class ResourceNotFoundException extends Exception {
+
+    private static final long serialVersionUID = 1L;
+
+    private String errCode;
+    private String errMsg;
+
+    /**
+     * Constructs a new runtime exception with the specified detail message.
+     * The cause is not initialized, and may subsequently be initialized by a
+     * call to {@link #initCause}.
+     *
+     * @param message the detail message. The detail message is saved for
+     *                later retrieval by the {@link #getMessage()} method.
+     */
+    public ResourceNotFoundException(String message, String errCode, String errMsg) {
+        super(message);
+        this.errCode = errCode;
+        this.errMsg = errMsg;
+    }
+}