Create methods for consumer api app creation and get details of app

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/APIApplicationServices.java

@@ -26,6 +26,12 @@ public interface APIApplicationServices {
 
     APIApplicationKey createAndRetrieveApplicationCredentials() throws APIServicesException;
 
+    APIApplicationKey generateAndRetrieveApplicationKeys(String applicationName, String tags[],
+                                                         String keyType, String username,
+                                                         boolean isAllowedAllDomains,
+                                                         String validityTime, String password)
+            throws APIServicesException;
+
     AccessTokenInfo generateAccessTokenFromRegisteredApplication(String clientId, String clientSecret) throws APIServicesException;
 
     AccessTokenInfo generateAccessTokenFromRefreshToken(String refreshToken, String clientId, String clientSecret) throws APIServicesException;

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/APIApplicationServicesImpl.java

@@ -35,6 +35,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.wso2.carbon.apimgt.impl.APIManagerConfiguration;
 import org.wso2.carbon.apimgt.impl.internal.ServiceReferenceHolder;
+
 import java.io.IOException;
 
 public class APIApplicationServicesImpl implements APIApplicationServices {
@@ -78,6 +79,38 @@ public class APIApplicationServicesImpl implements APIApplicationServices {
         }
     }
 
+    @Override
+    public APIApplicationKey generateAndRetrieveApplicationKeys(String applicationName, String tags[],
+                                                                String keyType, String username,
+                                                                boolean isAllowedAllDomains,
+                                                                String validityTime, String password)
+            throws APIServicesException {
+
+        String applicationEndpoint = config.getFirstProperty(Constants.DCR_END_POINT);
+
+        JSONObject jsonObject = new JSONObject();
+        jsonObject.put("callbackUrl", Constants.EMPTY_STRING);
+        jsonObject.put("clientName", username);
+        jsonObject.put("grantType", Constants.GRANT_TYPE);
+        jsonObject.put("owner", username);
+        jsonObject.put("saasApp", true);
+
+        RequestBody requestBody = RequestBody.Companion.create(jsonObject.toString(), JSON);
+        Request request = new Request.Builder()
+                .url(applicationEndpoint)
+                .addHeader(Constants.AUTHORIZATION_HEADER_NAME, Credentials.basic(username, password))
+                .post(requestBody)
+                .build();
+        try {
+            Response response = client.newCall(request).execute();
+            return gson.fromJson(response.body().string(), APIApplicationKey.class);
+        } catch (IOException e) {
+            msg = "Error occurred while processing the response";
+            log.error(msg, e);
+            throw new APIServicesException(e);
+        }
+    }
+
     @Override
     public AccessTokenInfo generateAccessTokenFromRegisteredApplication(String consumerKey, String consumerSecret)
             throws APIServicesException {

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/ConsumerRESTAPIServices.java

@@ -36,6 +36,10 @@ public interface ConsumerRESTAPIServices {
     Application[] getAllApplications(APIApplicationKey apiApplicationKey, AccessTokenInfo accessTokenInfo, String appName)
             throws APIServicesException, BadRequestException, UnexpectedResponseException;
 
+    Application getDetailsOfAnApplication(APIApplicationKey apiApplicationKey, AccessTokenInfo accessTokenInfo,
+                                          String applicationId)
+            throws APIServicesException, BadRequestException, UnexpectedResponseException;
+
     Application createApplication(APIApplicationKey apiApplicationKey, AccessTokenInfo accessTokenInfo,
                                   Application application)
             throws APIServicesException, BadRequestException, UnexpectedResponseException;

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/ConsumerRESTAPIServicesImpl.java

@@ -92,6 +92,45 @@ public class ConsumerRESTAPIServicesImpl implements ConsumerRESTAPIServices {
         }
     }
 
+    @Override
+    public Application getDetailsOfAnApplication(APIApplicationKey apiApplicationKey, AccessTokenInfo accessTokenInfo,
+                                                 String applicationId)
+            throws APIServicesException, BadRequestException, UnexpectedResponseException {
+
+        String getAllApplicationsUrl = endPointPrefix + Constants.APPLICATIONS_API + Constants.SLASH + applicationId;
+        Request request = new Request.Builder()
+                .url(getAllApplicationsUrl)
+                .addHeader(Constants.AUTHORIZATION_HEADER_NAME, Constants.AUTHORIZATION_HEADER_PREFIX_BEARER
+                        + accessTokenInfo.getAccess_token())
+                .get()
+                .build();
+
+        try {
+            Response response = client.newCall(request).execute();
+            if (HttpStatus.SC_OK == response.code()) {
+                return gson.fromJson(response.body().string(), Application.class);
+            } else if (HttpStatus.SC_UNAUTHORIZED == response.code()) {
+                APIApplicationServices apiApplicationServices = new APIApplicationServicesImpl();
+                AccessTokenInfo refreshedAccessToken = apiApplicationServices.
+                        generateAccessTokenFromRefreshToken(accessTokenInfo.getRefresh_token(),
+                                apiApplicationKey.getClientId(), apiApplicationKey.getClientSecret());
+                //TODO: max attempt count
+                return getDetailsOfAnApplication(apiApplicationKey, refreshedAccessToken, applicationId);
+            } else if (HttpStatus.SC_BAD_REQUEST == response.code()) {
+                String msg = "Bad Request, Invalid request";
+                log.error(msg);
+                throw new BadRequestException(msg);
+            } else {
+                String msg = "Response : " + response.code() + response.body();
+                throw new UnexpectedResponseException(msg);
+            }
+        } catch (IOException e) {
+            String msg = "Error occurred while processing the response";
+            log.error(msg, e);
+            throw new APIServicesException(msg, e);
+        }
+    }
+
     @Override
     public Application createApplication(APIApplicationKey apiApplicationKey, AccessTokenInfo accessTokenInfo,
                                          Application application)

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/bean/APIMConsumer/Application.java

@@ -37,7 +37,7 @@ public class Application {
     private int subscriptionCount;
     private List<String> keys;
     private JSONObject attributes;
-    private List<String> subscriptionScopes;
+    private List<Scopes> subscriptionScopes;
     private String owner;
     private boolean hashEnabled;
 
@@ -121,11 +121,11 @@ public class Application {
         this.attributes = attributes;
     }
 
-    public List<String> getSubscriptionScopes() {
+    public List<Scopes> getSubscriptionScopes() {
         return subscriptionScopes;
     }
 
-    public void setSubscriptionScopes(List<String> subscriptionScopes) {
+    public void setSubscriptionScopes(List<Scopes> subscriptionScopes) {
         this.subscriptionScopes = subscriptionScopes;
     }
 

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.extension.rest.api/src/main/java/io/entgra/device/mgt/core/apimgt/extension/rest/api/bean/APIMConsumer/Scopes.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you 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 io.entgra.device.mgt.core.apimgt.extension.rest.api.bean.APIMConsumer;
+
+import java.util.List;
+
+/**
+ * This class represents the scope data.
+ */
+
+public class Scopes {
+
+    private String key;
+    private String name;
+    private List<String> roles;
+    private String description;
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<String> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(List<String> roles) {
+        this.roles = roles;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}