Improve application artifact downloading functionality

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/services/ArtifactDownloadAPI.java

@@ -58,7 +58,7 @@ import javax.ws.rs.core.Response;
 public interface ArtifactDownloadAPI {
 
     @GET
-    @Path("/{tenantId}/{uuid}/{folderName}/{fileName}")
+    @Path("/{tenantId}/{appHashValue}/{folderName}/{fileName}")
     @Produces(MediaType.APPLICATION_OCTET_STREAM)
     @ApiOperation(
             produces = MediaType.APPLICATION_OCTET_STREAM,
@@ -88,10 +88,10 @@ public interface ArtifactDownloadAPI {
                     required = true)
             @PathParam("tenantId") int tenantId,
             @ApiParam(
-            name = "uuid",
-            value = "UUID of the application release.",
+            name = "hash-value",
+            value = "Hash value of the application release.",
             required = true)
-            @PathParam("uuid") String uuid,
+            @PathParam("appHashValue") String uuid,
             @ApiParam(
                     name = "folderName",
                     value = "Name of the folder where the artifact store.",

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/services/impl/ArtifactDownloadAPIImpl.java

@@ -48,19 +48,20 @@ import javax.ws.rs.core.Response;
 @Path("/artifact")
 public class ArtifactDownloadAPIImpl implements ArtifactDownloadAPI {
 
-    private static Log log = LogFactory.getLog(ArtifactDownloadAPIImpl.class);
+    private static final Log log = LogFactory.getLog(ArtifactDownloadAPIImpl.class);
 
     @GET
     @Override
     @Produces(MediaType.APPLICATION_OCTET_STREAM)
-    @Path("/{tenantId}/{uuid}/{folderName}/{fileName}")
+    @Path("/{tenantId}/{appHashValue}/{folderName}/{fileName}")
     public Response getArtifact(
             @PathParam("tenantId") int tenantId,
-            @PathParam("uuid") String uuid,
+            @PathParam("appHashValue") String appHashValue,
             @PathParam("folderName") String folderName,
             @PathParam("fileName") String fileName) {
         AppmDataHandler dataHandler = APIUtil.getDataHandler();
-        try (InputStream fileInputStream = dataHandler.getArtifactStream(tenantId, uuid, folderName, fileName)) {
+        try (InputStream fileInputStream = dataHandler
+                .getArtifactStream(tenantId, appHashValue, folderName, fileName)) {
             byte[] content = IOUtils.toByteArray(fileInputStream);
             try (ByteArrayInputStream binaryDuplicate = new ByteArrayInputStream(content)) {
                 Response.ResponseBuilder response = Response
@@ -75,12 +76,13 @@ public class ArtifactDownloadAPIImpl implements ArtifactDownloadAPI {
                 return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
             }
         } catch (NotFoundException e) {
-            String msg = "Couldn't find an application release for UUID: " + uuid + " and file name:  " + fileName;
+            String msg = "Couldn't find an application release for app hash value: " + appHashValue
+                    + " and file name:  " + fileName;
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         } catch (BadRequestException e) {
             String msg = "Invalid data is used with the request to get input stream of the application release. UUID: "
-                    + uuid + " and file name: " + fileName;
+                    + appHashValue + " and file name: " + fileName;
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {

components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/AppmDataHandler.java

@@ -28,7 +28,16 @@ public interface AppmDataHandler {
 
     Map<String, LifecycleState> getLifecycleConfiguration() throws LifecycleManagementException;
 
-    InputStream getArtifactStream(int tenantId, String uuid, String folderName, String artifactName)
+    /**
+     * Get the Input Stream of the Artifact
+     * @param tenantId Tenant Id
+     * @param appHashValue Hash Value of the application
+     * @param folderName Folder Name
+     * @param artifactName Artifact Name
+     * @return {@link InputStream}
+     * @throws ApplicationManagementException if error occurred while getting Input Stream of the artifact
+     */
+    InputStream getArtifactStream(int tenantId, String appHashValue, String folderName, String artifactName)
             throws ApplicationManagementException;
 
     /**

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/AppmDataHandlerImpl.java

@@ -17,6 +17,7 @@
 
 package org.wso2.carbon.device.application.mgt.core.impl;
 
+import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.wso2.carbon.device.application.mgt.common.config.LifecycleState;
@@ -25,15 +26,11 @@ import org.wso2.carbon.device.application.mgt.common.exception.ApplicationStorag
 import org.wso2.carbon.device.application.mgt.common.exception.LifecycleManagementException;
 import org.wso2.carbon.device.application.mgt.common.services.ApplicationStorageManager;
 import org.wso2.carbon.device.application.mgt.common.services.AppmDataHandler;
-import org.wso2.carbon.device.application.mgt.core.dao.ApplicationReleaseDAO;
-import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
 import org.wso2.carbon.device.application.mgt.core.exception.BadRequestException;
 import org.wso2.carbon.device.application.mgt.core.util.APIUtil;
-import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagementDAOException;
 import org.wso2.carbon.device.application.mgt.core.exception.NotFoundException;
 import org.wso2.carbon.device.application.mgt.core.internal.DataHolder;
 import org.wso2.carbon.device.application.mgt.core.lifecycle.LifecycleStateManager;
-import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
 import org.wso2.carbon.device.mgt.common.exceptions.DeviceManagementException;
 import org.wso2.carbon.device.mgt.core.dto.DeviceType;
 
@@ -54,38 +51,58 @@ public class AppmDataHandlerImpl implements AppmDataHandler {
         return lifecycleStateManager.getLifecycleConfig();
     }
 
-    @Override public InputStream getArtifactStream(int tenantId, String uuid, String folderName, String artifactName)
+    @Override
+    public InputStream getArtifactStream(int tenantId, String appHashValue, String folderName, String artifactName)
             throws ApplicationManagementException {
         ApplicationStorageManager applicationStorageManager = APIUtil.getApplicationStorageManager();
-        ApplicationReleaseDAO applicationReleaseDAO = ApplicationManagementDAOFactory.getApplicationReleaseDAO();
-        String appReleaseHashValue;
+        validateArtifactDownloadRequest(tenantId, appHashValue, folderName, artifactName);
         try {
-            ConnectionManagerUtil.openDBConnection();
-            appReleaseHashValue = applicationReleaseDAO.getReleaseHashValue(uuid, tenantId);
-            if (appReleaseHashValue == null) {
-                String msg = "Could't find application release for UUID: " + uuid + ". Hence try with valid UUID.";
-                log.error(msg);
-                throw new NotFoundException(msg);
-            }
             InputStream inputStream = applicationStorageManager
-                    .getFileStream(appReleaseHashValue, folderName, artifactName, tenantId);
+                    .getFileStream(appHashValue, folderName, artifactName, tenantId);
             if (inputStream == null) {
-                String msg = "Couldn't find the file in the file system.";
+                String msg = "Couldn't find the file in the file system. Tenant Id: " + tenantId + " App Has Value: "
+                        + appHashValue + " Folder Name: " + folderName + " Artifact name: " + artifactName;
                 log.error(msg);
-                throw new ApplicationManagementException(msg);
+                throw new NotFoundException(msg);
             }
             return inputStream;
-        } catch (ApplicationManagementDAOException e) {
-            String msg = "Error occurred when retrieving application release hash value for given application release "
-                    + "UUID: " + uuid;
-            log.error(msg, e);
-            throw new ApplicationManagementException(msg, e);
         } catch (ApplicationStorageManagementException e) {
             String msg = "Error occurred when getting input stream of the " + artifactName + " file.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
-        } finally {
-            ConnectionManagerUtil.closeDBConnection();
+        }
+    }
+
+    /**
+     * Validate the artifact downloading request
+     * @param tenantId Tenat Id
+     * @param appHashValue Application hash value
+     * @param folderName Folder Name
+     * @param artifactName Artifact name
+     * @throws BadRequestException if there is an invalid data to retrieve application artifact.
+     */
+    private void validateArtifactDownloadRequest(int tenantId, String appHashValue, String folderName,
+            String artifactName) throws BadRequestException {
+        if (tenantId != -1234 && tenantId <= 0) {
+            String msg = "Found invalid tenant Id to get application artifact. Tenant Id: " + tenantId;
+            log.error(msg);
+            throw new BadRequestException(msg);
+        }
+        if (StringUtils.isBlank(appHashValue)) {
+            String msg = "Found invalid application has value to get application artifact. Application hash value: "
+                    + appHashValue;
+            log.error(msg);
+            throw new BadRequestException(msg);
+        }
+        if (StringUtils.isBlank(folderName)) {
+            String msg = "Found invalid folder name to get application artifact. Folder name: " + folderName;
+            log.error(msg);
+            throw new BadRequestException(msg);
+        }
+        if (StringUtils.isBlank(artifactName)) {
+            String msg = "Found invalid artifact name to get application artifact. Artifact name: " + artifactName;
+            log.error(msg);
+            throw new BadRequestException(msg);
         }
     }
 

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/util/APIUtil.java

@@ -379,9 +379,8 @@ public class APIUtil {
     public static ApplicationRelease releaseDtoToRelease(ApplicationReleaseDTO applicationReleaseDTO)
             throws ApplicationManagementException {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
-        String basePath =
-                getArtifactDownloadBaseURL() + tenantId + Constants.FORWARD_SLASH + applicationReleaseDTO.getUuid()
-                        + Constants.FORWARD_SLASH;
+        String basePath = getArtifactDownloadBaseURL() + tenantId + Constants.FORWARD_SLASH + applicationReleaseDTO
+                .getAppHashValue() + Constants.FORWARD_SLASH;
 
         List<String> screenshotPaths = new ArrayList<>();
         ApplicationRelease applicationRelease = new ApplicationRelease();