Merge pull request 'Add stream base file uploading' (#338) from rajitha/device-mgt-core:stream-api into master

Reviewed-on: community/device-mgt-core#338

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/ChunkDescriptor.java

@@ -0,0 +1,52 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common;
+
+import java.io.InputStream;
+
+public class ChunkDescriptor {
+    private FileDescriptor associateFileDescriptor;
+    private long size;
+    private InputStream chunk;
+
+    public FileDescriptor getAssociateFileDescriptor() {
+        return associateFileDescriptor;
+    }
+
+    public void setAssociateFileDescriptor(FileDescriptor associateFileDescriptor) {
+        this.associateFileDescriptor = associateFileDescriptor;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    public void setSize(long size) {
+        this.size = size;
+    }
+
+    public InputStream getChunk() {
+        return chunk;
+    }
+
+    public void setChunk(InputStream chunk) {
+        this.chunk = chunk;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/FileDescriptor.java

@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common;
+
+import java.io.InputStream;
+
+public class FileDescriptor {
+    private String fileName;
+    private String extension;
+    private String fullQualifiedName;
+    private String absolutePath;
+    private long actualFileSize;
+    private InputStream file;
+
+    public InputStream getFile() {
+        return file;
+    }
+
+    public void setFile(InputStream file) {
+        this.file = file;
+    }
+
+    public String getFileName() {
+        return fileName;
+    }
+
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+
+    public String getExtension() {
+        return extension;
+    }
+
+    public void setExtension(String extension) {
+        this.extension = extension;
+    }
+
+    public String getAbsolutePath() {
+        return absolutePath;
+    }
+
+    public void setAbsolutePath(String absolutePath) {
+        this.absolutePath = absolutePath;
+    }
+
+    public long getActualFileSize() {
+        return actualFileSize;
+    }
+
+    public void setActualFileSize(long actualFileSize) {
+        this.actualFileSize = actualFileSize;
+    }
+
+    public String getFullQualifiedName() {
+        return fullQualifiedName;
+    }
+
+    public void setFullQualifiedName(String fullQualifiedName) {
+        this.fullQualifiedName = fullQualifiedName;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/FileMetaEntry.java

@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common;
+
+public class FileMetaEntry {
+    private String fileName;
+    private String extension;
+
+    private long size;
+    private String absolutePath;
+
+    public String getAbsolutePath() {
+        return absolutePath;
+    }
+
+    public void setAbsolutePath(String absolutePath) {
+        this.absolutePath = absolutePath;
+    }
+
+    public String getFileName() {
+        return fileName;
+    }
+
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+
+    public String getExtension() {
+        return extension;
+    }
+
+    public void setExtension(String extension) {
+        this.extension = extension;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    public void setSize(long size) {
+        this.size = size;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/TransferLink.java

@@ -0,0 +1,108 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common;
+
+import java.util.Objects;
+
+public class TransferLink {
+    private static final String SCHEMA_SEPARATOR = "://";
+    private static final String URL_SEPARATOR = "/";
+    private static final String COLON = ":";
+    private final String schema;
+    private final String host;
+    private final String port;
+    private final String endpoint;
+    private final String artifactHolderUUID;
+
+    private TransferLink(String schema, String host, String port, String endpoint, String artifactHolderUUID) {
+        this.schema = schema;
+        this.host = host;
+        this.port = port;
+        this.endpoint = endpoint;
+        this.artifactHolderUUID = artifactHolderUUID;
+    }
+
+    public String getDirectTransferLink() {
+        return schema + SCHEMA_SEPARATOR + host + COLON + port + URL_SEPARATOR + endpoint + URL_SEPARATOR + artifactHolderUUID;
+    }
+
+    public String getRelativeTransferLink() {
+        return endpoint + URL_SEPARATOR + artifactHolderUUID;
+    }
+
+    @Override
+    public String toString() {
+        return getDirectTransferLink();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        TransferLink that = (TransferLink) o;
+        return Objects.equals(schema, that.schema) && Objects.equals(host, that.host) && Objects.equals(port, that.port)
+                && Objects.equals(endpoint, that.endpoint) && Objects.equals(artifactHolderUUID, that.artifactHolderUUID);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(schema, host, port, endpoint, artifactHolderUUID);
+    }
+
+    public static class TransferLinkBuilder {
+        private static final String DEFAULT_SCHEMA = "https";
+        private static final String ENDPOINT = "application-mgt-publisher/v1.0/applications/uploads";
+        private static final String IOT_GW_HOST_ENV_VAR = "iot.gateway.host";
+        private static final String IOT_GW_HTTPS_PORT_ENV_VAR = "iot.gateway.https.port";
+        private static final String IOT_GW_HTTP_PORT_ENV_VAR = "iot.gateway.http.port";
+        private String schema;
+        private String endpoint;
+        private final String artifactHolderUUID;
+
+        public TransferLinkBuilder(String artifactHolderUUID) {
+            this.schema = DEFAULT_SCHEMA;
+            this.endpoint = ENDPOINT;
+            this.artifactHolderUUID = artifactHolderUUID;
+        }
+
+        public TransferLinkBuilder withSchema(String schema) {
+            this.schema = schema;
+            return this;
+        }
+
+        public TransferLinkBuilder withEndpoint(String endpoint) {
+            this.endpoint = endpoint;
+            return this;
+        }
+
+        public TransferLink build() {
+            return new TransferLink(this.schema, resolveHost(), resolvePort(), this.endpoint, this.artifactHolderUUID);
+        }
+
+        private String resolveHost() {
+            return System.getProperty(IOT_GW_HOST_ENV_VAR);
+        }
+
+        private String resolvePort() {
+            return Objects.equals(this.schema, DEFAULT_SCHEMA) ? System.getProperty(IOT_GW_HTTPS_PORT_ENV_VAR)
+                    : System.getProperty(IOT_GW_HTTP_PORT_ENV_VAR);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/exception/FileDownloaderServiceException.java

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common.exception;
+
+public class FileDownloaderServiceException extends Exception {
+    public FileDownloaderServiceException(String msg) {
+        super(msg);
+    }
+
+    public FileDownloaderServiceException(String msg, Throwable t) {
+        super(msg, t);
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/exception/FileTransferServiceException.java

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common.exception;
+
+public class FileTransferServiceException extends Exception {
+    public FileTransferServiceException(String msg) {
+        super(msg);
+    }
+
+    public FileTransferServiceException(String msg, Throwable throwable) {
+        super(msg, throwable);
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/services/ApplicationManager.java

@@ -371,11 +371,9 @@ public interface ApplicationManager {
      *
      * @param releaseUuid UUID of the application release.
      * @param entAppReleaseWrapper {@link ApplicationReleaseDTO}
-     * @param applicationArtifact {@link ApplicationArtifact}
      * @return If the application release is updated correctly True returns, otherwise retuen False
      */
-    ApplicationRelease updateEntAppRelease(String releaseUuid, EntAppReleaseWrapper entAppReleaseWrapper,
+    ApplicationRelease updateEntAppRelease(String releaseUuid, EntAppReleaseWrapper entAppReleaseWrapper) throws ApplicationManagementException;
-                                           ApplicationArtifact applicationArtifact) throws ApplicationManagementException;
 
 
     /**
@@ -383,33 +381,27 @@ public interface ApplicationManager {
      *
      * @param releaseUuid UUID of the application release.
      * @param publicAppReleaseWrapper {@link ApplicationReleaseDTO}
-     * @param applicationArtifact {@link ApplicationArtifact}
      * @return If the application release is updated correctly True returns, otherwise retuen False
      */
-    ApplicationRelease updatePubAppRelease(String releaseUuid, PublicAppReleaseWrapper publicAppReleaseWrapper,
+    ApplicationRelease updatePubAppRelease(String releaseUuid, PublicAppReleaseWrapper publicAppReleaseWrapper) throws ApplicationManagementException;
-                                           ApplicationArtifact applicationArtifact) throws ApplicationManagementException;
 
     /**
      * Use to update existing web app release
      *
      * @param releaseUuid UUID of the application release.
      * @param webAppReleaseWrapper {@link ApplicationReleaseDTO}
-     * @param applicationArtifact {@link ApplicationArtifact}
      * @return If the application release is updated correctly True returns, otherwise retuen False
      */
-    ApplicationRelease updateWebAppRelease(String releaseUuid, WebAppReleaseWrapper webAppReleaseWrapper,
+    ApplicationRelease updateWebAppRelease(String releaseUuid, WebAppReleaseWrapper webAppReleaseWrapper) throws ApplicationManagementException;
-                                           ApplicationArtifact applicationArtifact) throws ApplicationManagementException;
 
     /**
      * Use to update existing custom app release
      *
      * @param releaseUuid UUID of the application release.
      * @param customAppReleaseWrapper {@link ApplicationReleaseDTO}
-     * @param applicationArtifact {@link ApplicationArtifact}
      * @return If the application release is updated correctly True returns, otherwise retuen False
      */
-    ApplicationRelease updateCustomAppRelease(String releaseUuid, CustomAppReleaseWrapper customAppReleaseWrapper,
+    ApplicationRelease updateCustomAppRelease(String releaseUuid, CustomAppReleaseWrapper customAppReleaseWrapper) throws ApplicationManagementException;
-                                              ApplicationArtifact applicationArtifact) throws ApplicationManagementException;
 
     /**
      * To validate the application creating request

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/services/FileDownloaderService.java

@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common.services;
+
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileDownloaderServiceException;
+
+import java.net.URL;
+
+public interface FileDownloaderService {
+    FileDescriptor download(URL downloadUrl) throws FileDownloaderServiceException;
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/services/FileTransferService.java

@@ -0,0 +1,73 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common.services;
+
+import io.entgra.device.mgt.core.application.mgt.common.ChunkDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileMetaEntry;
+import io.entgra.device.mgt.core.application.mgt.common.TransferLink;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileTransferServiceException;
+import io.entgra.device.mgt.core.device.mgt.common.exceptions.NotFoundException;
+
+import java.io.InputStream;
+import java.net.URL;
+
+public interface FileTransferService {
+    /**
+     * Create an upload link
+     * @param fileMetaEntry {@link FileMetaEntry}
+     * @return {@link TransferLink}
+     * @throws FileTransferServiceException Throws when error encountered while generating upload link
+     */
+    TransferLink generateUploadLink(FileMetaEntry fileMetaEntry) throws FileTransferServiceException;
+
+    /**
+     * Resolve {@link ChunkDescriptor} using artifactHolder UUID and a given chunk
+     * @param artifactHolder Artifact holder's UUID string
+     * @param chunk Data chunk
+     * @return {@link ChunkDescriptor}
+     * @throws FileTransferServiceException Throws when error encountered while resolving chunk descriptor
+     * @throws NotFoundException Throws when artifact holder not exists in the file system
+     */
+    ChunkDescriptor resolve(String artifactHolder, InputStream chunk) throws FileTransferServiceException, NotFoundException;
+
+    /**
+     * Write chunk of data
+     * @param chunkDescriptor {@link ChunkDescriptor}
+     * @throws FileTransferServiceException Throws when error encountered while writing chunk
+     */
+    void writeChunk(ChunkDescriptor chunkDescriptor) throws FileTransferServiceException;
+
+    /**
+     * Check if the provided download url point to a file which exists on the local env or not
+     * @param downloadUrl Download URL
+     * @return Returns true if the download URL point to a file which resides in local
+     * @throws FileTransferServiceException Throws when error encountered while checking
+     */
+    boolean isExistsOnLocal(URL downloadUrl) throws FileTransferServiceException;
+
+    /**
+     * Resolve {@link FileDescriptor} from a given download URL
+     * @param downloadUrl Download URL
+     * @return {@link java.io.FileDescriptor}
+     * @throws FileTransferServiceException Throws when error encountered while resolving file descriptor
+     */
+    FileDescriptor resolve(URL downloadUrl) throws FileTransferServiceException;
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/CustomAppReleaseWrapper.java

@@ -83,6 +83,44 @@ public class CustomAppReleaseWrapper {
     @ApiModelProperty(name = "icon",
             value = "banner of the application")
     private Base64File banner;
+    private boolean remoteStatus;
+
+    public boolean isRemoteStatus() {
+        return remoteStatus;
+    }
+
+    public void setRemoteStatus(boolean remoteStatus) {
+        this.remoteStatus = remoteStatus;
+    }
+
+    private String artifactLink;
+    private List<String> screenshotLinks;
+    private String iconLink;
+    private String bannerLink;
+
+    public String getArtifactLink() {
+        return artifactLink;
+    }
+
+    public void setArtifactLink(String artifactLink) {
+        this.artifactLink = artifactLink;
+    }
+
+    public List<String> getScreenshotLinks() {
+        return screenshotLinks;
+    }
+
+    public void setScreenshotLinks(List<String> screenshotLinks) {
+        this.screenshotLinks = screenshotLinks;
+    }
+
+    public String getIconLink() {
+        return iconLink;
+    }
+
+    public void setIconLink(String iconLink) {
+        this.iconLink = iconLink;
+    }
 
     public String getReleaseType() {
         return releaseType;
@@ -173,4 +211,12 @@ public class CustomAppReleaseWrapper {
     public void setBanner(Base64File banner) {
         this.banner = banner;
     }
+
+    public String getBannerLink() {
+        return bannerLink;
+    }
+
+    public void setBannerLink(String bannerLink) {
+        this.bannerLink = bannerLink;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/EntAppReleaseWrapper.java

@@ -86,6 +86,44 @@ public class EntAppReleaseWrapper {
     @ApiModelProperty(name = "icon",
             value = "banner of the application")
     private Base64File banner;
+    private boolean remoteStatus;
+
+    public boolean isRemoteStatus() {
+        return remoteStatus;
+    }
+
+    public void setRemoteStatus(boolean remoteStatus) {
+        this.remoteStatus = remoteStatus;
+    }
+
+    private String artifactLink;
+    private List<String> screenshotLinks;
+    private String iconLink;
+    private String bannerLink;
+
+    public String getArtifactLink() {
+        return artifactLink;
+    }
+
+    public void setArtifactLink(String artifactLink) {
+        this.artifactLink = artifactLink;
+    }
+
+    public List<String> getScreenshotLinks() {
+        return screenshotLinks;
+    }
+
+    public void setScreenshotLinks(List<String> screenshotLinks) {
+        this.screenshotLinks = screenshotLinks;
+    }
+
+    public String getIconLink() {
+        return iconLink;
+    }
+
+    public void setIconLink(String iconLink) {
+        this.iconLink = iconLink;
+    }
 
     public String getReleaseType() {
         return releaseType;
@@ -174,4 +212,12 @@ public class EntAppReleaseWrapper {
     public void setBanner(Base64File banner) {
         this.banner = banner;
     }
+
+    public String getBannerLink() {
+        return bannerLink;
+    }
+
+    public void setBannerLink(String bannerLink) {
+        this.bannerLink = bannerLink;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/PublicAppReleaseWrapper.java

@@ -86,6 +86,18 @@ public class PublicAppReleaseWrapper {
     @ApiModelProperty(name = "icon",
             value = "banner of the application")
     private Base64File banner;
+    private boolean remoteStatus;
+
+    public boolean isRemoteStatus() {
+        return remoteStatus;
+    }
+
+    public void setRemoteStatus(boolean remoteStatus) {
+        this.remoteStatus = remoteStatus;
+    }
+    private List<String> screenshotLinks;
+    private String iconLink;
+    private String bannerLink;
 
     public String getReleaseType() {
         return releaseType;
@@ -162,4 +174,28 @@ public class PublicAppReleaseWrapper {
     public void setBanner(Base64File banner) {
         this.banner = banner;
     }
+
+    public List<String> getScreenshotLinks() {
+        return screenshotLinks;
+    }
+
+    public void setScreenshotLinks(List<String> screenshotLinks) {
+        this.screenshotLinks = screenshotLinks;
+    }
+
+    public String getIconLink() {
+        return iconLink;
+    }
+
+    public void setIconLink(String iconLink) {
+        this.iconLink = iconLink;
+    }
+
+    public String getBannerLink() {
+        return bannerLink;
+    }
+
+    public void setBannerLink(String bannerLink) {
+        this.bannerLink = bannerLink;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/TransferLinkWrapper.java

@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.common.wrapper;
+
+public class TransferLinkWrapper {
+    private String directTransferLink;
+    private String relativeTransferLink;
+
+    public String getDirectTransferLink() {
+        return directTransferLink;
+    }
+
+    public void setDirectTransferLink(String directTransferLink) {
+        this.directTransferLink = directTransferLink;
+    }
+
+    public String getRelativeTransferLink() {
+        return relativeTransferLink;
+    }
+
+    public void setRelativeTransferLink(String relativeTransferLink) {
+        this.relativeTransferLink = relativeTransferLink;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/WebAppReleaseWrapper.java

@@ -77,6 +77,42 @@ public class WebAppReleaseWrapper {
     @ApiModelProperty(name = "icon",
             value = "banner of the application")
     private Base64File banner;
+    private boolean remoteStatus;
+
+    public boolean isRemoteStatus() {
+        return remoteStatus;
+    }
+
+    public void setRemoteStatus(boolean remoteStatus) {
+        this.remoteStatus = remoteStatus;
+    }
+    private List<String> screenshotLinks;
+    private String iconLink;
+    private String bannerLink;
+
+    public List<String> getScreenshotLinks() {
+        return screenshotLinks;
+    }
+
+    public void setScreenshotLinks(List<String> screenshotLinks) {
+        this.screenshotLinks = screenshotLinks;
+    }
+
+    public String getIconLink() {
+        return iconLink;
+    }
+
+    public void setIconLink(String iconLink) {
+        this.iconLink = iconLink;
+    }
+
+    public String getBannerLink() {
+        return bannerLink;
+    }
+
+    public void setBannerLink(String bannerLink) {
+        this.bannerLink = bannerLink;
+    }
 
     public String getReleaseType() {
         return releaseType;

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/pom.xml

@@ -105,6 +105,9 @@
                     <systemPropertyVariables>
                         <jacoco-agent.destfile>${basedir}/target/coverage-reports/jacoco-unit.exec</jacoco-agent.destfile>
                         <log4j.configuration>file:src/test/resources/log4j.properties</log4j.configuration>
+                        <iot.gateway.http.port>8280</iot.gateway.http.port>
+                        <iot.gateway.https.port>8280</iot.gateway.https.port>
+                        <iot.gateway.host>test</iot.gateway.host>
                     </systemPropertyVariables>
                 </configuration>
             </plugin>
@@ -112,7 +115,6 @@
     </build>
 
     <dependencies>
-
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
@@ -367,6 +369,21 @@
             <artifactId>org.wso2.carbon.ntask.core</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <scope>compile</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>com.squareup.okio</groupId>
+                    <artifactId>okio</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okio</groupId>
+            <artifactId>okio</artifactId>
+        </dependency>
     </dependencies>
 </project>
 

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/exception/FileTransferServiceHelperUtilException.java

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.core.exception;
+
+public class FileTransferServiceHelperUtilException extends Exception {
+    public FileTransferServiceHelperUtilException(String msg) {
+        super(msg);
+    }
+
+    public FileTransferServiceHelperUtilException(String msg, Throwable t) {
+        super(msg, t);
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/ApplicationManagerImpl.java

@@ -18,11 +18,14 @@
 
 package io.entgra.device.mgt.core.application.mgt.core.impl;
 
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileDownloaderServiceException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileTransferServiceException;
 import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestException;
 import io.entgra.device.mgt.core.device.mgt.common.Base64File;
 import io.entgra.device.mgt.core.application.mgt.core.dao.SPApplicationDAO;
 import io.entgra.device.mgt.core.application.mgt.core.util.ApplicationManagementUtil;
 import io.entgra.device.mgt.core.device.mgt.common.PaginationRequest;
+import io.entgra.device.mgt.core.device.mgt.common.app.mgt.App;
 import io.entgra.device.mgt.core.device.mgt.common.exceptions.MetadataManagementException;
 import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.Metadata;
 import org.apache.commons.codec.digest.DigestUtils;
@@ -103,6 +106,8 @@ import javax.ws.rs.core.Response;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -145,6 +150,55 @@ public class ApplicationManagerImpl implements ApplicationManager {
 
     @Override
     public <T> Application createApplication(T app, boolean isPublished) throws ApplicationManagementException {
+        return createApplicationBasedOnRemoteStatus(app, isPublished);
+    }
+
+    /**
+     * Create the application based on the release wrapper's remote status. If the remote status is true, then
+     * the application creation will take place asynchronously.
+     * @param app Application release wrapper
+     * @param isPublished Publish status
+     * @return {@link Application}
+     * @throws ApplicationManagementException Throws when error occurred while application creation
+     */
+    @SuppressWarnings("unchecked")
+    private <T> Application createApplicationBasedOnRemoteStatus(T app, boolean isPublished) throws ApplicationManagementException {
+        if (ApplicationManagementUtil.getRemoteStatus(app)) {
+            List<?> releaseWrappers = ApplicationManagementUtil.deriveApplicationWithoutRelease(app);
+            Application createdApplication = triggerApplicationCreation(app, isPublished);
+            if (createdApplication == null) {
+                throw new ApplicationManagementException("Null retrieved for created application.");
+            }
+            try {
+                if (releaseWrappers != null && !releaseWrappers.isEmpty()) {
+                    if (app instanceof ApplicationWrapper) {
+                        ((ApplicationWrapper) app).setEntAppReleaseWrappers((List<EntAppReleaseWrapper>) releaseWrappers);
+                        createApplicationReleaseBasedOnRemoteStatus(createdApplication.getId(),
+                                ((ApplicationWrapper) app).getEntAppReleaseWrappers().get(0), isPublished);
+                    } else if (app instanceof CustomAppWrapper) {
+                        ((CustomAppWrapper) app).setCustomAppReleaseWrappers((List<CustomAppReleaseWrapper>) releaseWrappers);
+                        createApplicationReleaseBasedOnRemoteStatus(createdApplication.getId(),
+                                ((CustomAppWrapper) app).getCustomAppReleaseWrappers().get(0), isPublished);
+                    } else {
+                        throw new ApplicationManagementException("Unsupported release wrapper received");
+                    }
+                }
+                return createdApplication;
+            } catch (ResourceManagementException e) {
+                throw new ApplicationManagementException("Error encountered while creating deploying artifact", e);
+            }
+        }
+        return triggerApplicationCreation(app, isPublished);
+    }
+
+    /**
+     * Trigger the application creation process
+     * @param app Application release wrapper
+     * @param isPublished Publish status
+     * @return {@link Application}
+     * @throws ApplicationManagementException Throws when error occurred while creating the application
+     */
+    private <T> Application triggerApplicationCreation(T app, boolean isPublished) throws ApplicationManagementException {
         ApplicationDTO applicationDTO = uploadReleaseArtifactIfExist(app);
         try {
             ConnectionManagerUtil.beginDBTransaction();
@@ -172,22 +226,110 @@ public class ApplicationManagerImpl implements ApplicationManager {
         }
     }
 
+    /**
+     * Create application release based on remote status. If the remote status is true, then the
+     * application release creation will take place asynchronously.
+     * @param appId Application id
+     * @param releaseWrapper Release wrapper
+     * @param isPublished Publish status
+     * @return {@link Application}
+     * @throws ApplicationManagementException Throws when error occurred while deploying the release
+     * @throws ResourceManagementException Throws when error occurred while deploying the release
+     */
+    private <T> ApplicationRelease createApplicationReleaseBasedOnRemoteStatus(int appId, T releaseWrapper, boolean isPublished)
+            throws ApplicationManagementException, ResourceManagementException {
+        if (ApplicationManagementUtil.getRemoteStatusFromWrapper(releaseWrapper)) {
+            triggerReleaseAsynchronously(appId, releaseWrapper, isPublished);
+        } else {
+            if (releaseWrapper instanceof EntAppReleaseWrapper) {
+                return triggerEntAppRelease(appId, (EntAppReleaseWrapper) releaseWrapper, isPublished);
+            }
+
+            if (releaseWrapper instanceof CustomAppReleaseWrapper) {
+                return triggerCustomAppRelease(appId, (CustomAppReleaseWrapper) releaseWrapper, isPublished);
+            }
+
+            throw new ApplicationManagementException("Unsupported release wrapper received");
+        }
+        return new ApplicationRelease();
+    }
+
+    /**
+     * Trigger release creation asynchronously
+     * @param appId Application id
+     * @param releaseWrapper Release wrapper
+     * @param isPublished Publish status
+     */
+    private <T> void triggerReleaseAsynchronously(int appId, T releaseWrapper, boolean isPublished) {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String username = PrivilegedCarbonContext.getThreadLocalCarbonContext().getUsername();
+        new Thread(() -> {
+            try {
+                PrivilegedCarbonContext.startTenantFlow();
+                PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantId(tenantId, true);
+                PrivilegedCarbonContext.getThreadLocalCarbonContext().setUsername(username);
+                if (releaseWrapper instanceof EntAppReleaseWrapper &&
+                        ((EntAppReleaseWrapper) releaseWrapper).isRemoteStatus()) {
+                    triggerEntAppRelease(appId, (EntAppReleaseWrapper) releaseWrapper, isPublished);
+                }else if (releaseWrapper instanceof CustomAppReleaseWrapper &&
+                        ((CustomAppReleaseWrapper) releaseWrapper).isRemoteStatus()) {
+                    triggerCustomAppRelease(appId, (CustomAppReleaseWrapper) releaseWrapper, isPublished);
+                } else {
+                    throw new ApplicationManagementException("Unsupported release wrapper received");
+                }
+            } catch (ApplicationManagementException | ResourceManagementException e) {
+                log.error("Error encountered while deploying remote application release", e);
+            } finally {
+                PrivilegedCarbonContext.endTenantFlow();
+            }
+        }).start();
+    }
+
+    /**
+     * Trigger enterprise application creation
+     * @param appId Application id
+     * @param releaseWrapper Release wrapper
+     * @param isPublished Publish status
+     * @return {@link ApplicationRelease}
+     * @throws ApplicationManagementException Throws when error encountered while creating enterprise application
+     */
+    private ApplicationRelease triggerEntAppRelease(int appId, EntAppReleaseWrapper releaseWrapper, boolean isPublished)
+            throws ApplicationManagementException{
+        ApplicationManager applicationManager = APIUtil.getApplicationManager();
+        try {
+            ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
+                    releaseWrapper.getArtifactLink(), releaseWrapper.getBannerLink());
+            ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
+            DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
+            ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
+            releaseDTO = uploadEntAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName(), true);
+            try {
+                return createRelease(applicationDTO, releaseDTO, ApplicationType.ENTERPRISE, isPublished);
+            } catch (ApplicationManagementException e) {
+                String msg = "Error occurred while creating ent app release for application with the name: " + applicationDTO.getName();
+                log.error(msg, e);
+                deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
+                throw new ApplicationManagementException(msg, e);
+            }
+        } catch (MalformedURLException e) {
+            String msg = "Malformed URL link received as a downloadable link";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (FileDownloaderServiceException e) {
+            String msg = "Error encountered while downloading application release artifacts for app id " + appId;
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
+
     @Override
     public ApplicationRelease createEntAppRelease(int appId, EntAppReleaseWrapper releaseWrapper, boolean isPublished)
             throws ApplicationManagementException {
-        ApplicationManager applicationManager = APIUtil.getApplicationManager();
-        ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(), releaseWrapper.getScreenshots(),
-                releaseWrapper.getBinaryFile(), releaseWrapper.getBanner());
-        ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
-        ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
-        releaseDTO = uploadEntAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName(), true);
         try {
-            return createRelease(applicationDTO, releaseDTO, ApplicationType.ENTERPRISE, isPublished);
+            return createApplicationReleaseBasedOnRemoteStatus(appId, releaseWrapper, isPublished);
-        } catch (ApplicationManagementException e) {
+        } catch (ResourceManagementException e) {
-            String msg = "Error occurred while creating ent app release for application with the name: " + applicationDTO.getName();
+            String msg = "Error occurred while creating enterprise app release for the app id " + appId;
             log.error(msg, e);
-            deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
             throw new ApplicationManagementException(msg, e);
         }
     }
@@ -196,17 +338,27 @@ public class ApplicationManagerImpl implements ApplicationManager {
     public ApplicationRelease createWebAppRelease(int appId, WebAppReleaseWrapper releaseWrapper, boolean isPublished)
             throws ApplicationManagementException, ResourceManagementException {
         ApplicationManager applicationManager = APIUtil.getApplicationManager();
-        ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
-                releaseWrapper.getScreenshots(), null, releaseWrapper.getBanner());
-        ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
-        releaseDTO = uploadWebAppReleaseArtifacts(releaseDTO, artifact);
         try {
-            return createRelease(applicationDTO, releaseDTO, ApplicationType.WEB_CLIP, isPublished);
+            ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        } catch (ApplicationManagementException e) {
+            ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
-            String msg = "Error occurred while creating web app release for application with the name: " + applicationDTO.getName();
+                    null, releaseWrapper.getBannerLink());
+            ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
+            releaseDTO = uploadWebAppReleaseArtifacts(releaseDTO, artifact);
+            try {
+                return createRelease(applicationDTO, releaseDTO, ApplicationType.WEB_CLIP, isPublished);
+            } catch (ApplicationManagementException e) {
+                String msg = "Error occurred while creating web app release for application with the name: " + applicationDTO.getName();
+                log.error(msg, e);
+                deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
+                throw new ApplicationManagementException(msg, e);
+            }
+        } catch (MalformedURLException e) {
+            String msg = "Malformed URL link received as a downloadable link";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (FileDownloaderServiceException e) {
+            String msg = "Error encountered while downloading application release artifacts";
             log.error(msg, e);
-            deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
             throw new ApplicationManagementException(msg, e);
         }
     }
@@ -215,38 +367,69 @@ public class ApplicationManagerImpl implements ApplicationManager {
     public ApplicationRelease createPubAppRelease(int appId, PublicAppReleaseWrapper releaseWrapper, boolean isPublished) throws
             ResourceManagementException, ApplicationManagementException {
         ApplicationManager applicationManager = APIUtil.getApplicationManager();
-        ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
-        ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
-                releaseWrapper.getScreenshots(), null, releaseWrapper.getBanner());
-        ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
-        releaseDTO = uploadPubAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName());
         try {
-            return createRelease(applicationDTO, releaseDTO, ApplicationType.PUBLIC, isPublished);
+            ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        } catch (ApplicationManagementException e) {
+            DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
-            String msg = "Error occurred while creating ent public release for application with the name: " + applicationDTO.getName();
+            ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
+                    null, releaseWrapper.getBannerLink());
+            ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
+            releaseDTO = uploadPubAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName());
+            try {
+                return createRelease(applicationDTO, releaseDTO, ApplicationType.PUBLIC, isPublished);
+            } catch (ApplicationManagementException e) {
+                String msg = "Error occurred while creating ent public release for application with the name: " + applicationDTO.getName();
+                log.error(msg, e);
+                deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
+                throw new ApplicationManagementException(msg, e);
+            }
+        } catch (MalformedURLException e) {
+            String msg = "Malformed URL link received as a downloadable link";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (FileDownloaderServiceException e) {
+            String msg = "Error encountered while downloading application release artifacts";
             log.error(msg, e);
-            deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
             throw new ApplicationManagementException(msg, e);
         }
     }
 
     @Override
     public ApplicationRelease createCustomAppRelease(int appId, CustomAppReleaseWrapper releaseWrapper, boolean isPublished)
+            throws ApplicationManagementException {
+        try {
+            return createApplicationReleaseBasedOnRemoteStatus(appId, releaseWrapper, isPublished);
+        } catch (ResourceManagementException e) {
+            String msg = "Error occurred while creating enterprise app release";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
+
+    private ApplicationRelease triggerCustomAppRelease(int appId, CustomAppReleaseWrapper releaseWrapper, boolean isPublished)
             throws ResourceManagementException, ApplicationManagementException {
         ApplicationManager applicationManager = APIUtil.getApplicationManager();
-        ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
-        ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
-                releaseWrapper.getScreenshots(), releaseWrapper.getBinaryFile(), releaseWrapper.getBanner());
-        ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
-        releaseDTO = uploadCustomAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName());
         try {
-            return createRelease(applicationDTO, releaseDTO, ApplicationType.CUSTOM, isPublished);
+            ApplicationDTO applicationDTO = applicationManager.getApplication(appId);
-        } catch (ApplicationManagementException e) {
+            DeviceType deviceType = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
-            String msg = "Error occurred while creating custom app release for application with the name: " + applicationDTO.getName();
+            ApplicationArtifact artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
+                    releaseWrapper.getArtifactLink(), releaseWrapper.getBannerLink());
+            ApplicationReleaseDTO releaseDTO = APIUtil.releaseWrapperToReleaseDTO(releaseWrapper);
+            releaseDTO = uploadCustomAppReleaseArtifacts(releaseDTO, artifact, deviceType.getName());
+            try {
+                return createRelease(applicationDTO, releaseDTO, ApplicationType.CUSTOM, isPublished);
+            } catch (ApplicationManagementException e) {
+                String msg = "Error occurred while creating custom app release for application with the name: " + applicationDTO.getName();
+                log.error(msg, e);
+                deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
+                throw new ApplicationManagementException(msg, e);
+            }
+        } catch (MalformedURLException e) {
+            String msg = "Malformed URL link received as a downloadable link";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (FileDownloaderServiceException e) {
+            String msg = "Error encountered while downloading application release artifacts";
             log.error(msg, e);
-            deleteApplicationArtifacts(Collections.singletonList(releaseDTO.getAppHashValue()));
             throw new ApplicationManagementException(msg, e);
         }
     }
@@ -279,27 +462,27 @@ public class ApplicationManagerImpl implements ApplicationManager {
             if (app instanceof ApplicationWrapper) {
                 ApplicationWrapper wrapper = (ApplicationWrapper) app;
                 EntAppReleaseWrapper releaseWrapper = wrapper.getEntAppReleaseWrappers().get(0);
-                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
+                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
-                        releaseWrapper.getScreenshots(), releaseWrapper.getBinaryFile(), releaseWrapper.getBanner());
+                        releaseWrapper.getArtifactLink(), releaseWrapper.getBannerLink());
                 releaseDTO = uploadEntAppReleaseArtifacts(releaseDTO,
                         artifact, wrapper.getDeviceType(), false);
             } else if (app instanceof PublicAppWrapper) {
                 PublicAppWrapper wrapper = (PublicAppWrapper) app;
                 PublicAppReleaseWrapper releaseWrapper = wrapper.getPublicAppReleaseWrappers().get(0);
-                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
+                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
-                        releaseWrapper.getScreenshots(), null, releaseWrapper.getBanner());
+                        null, releaseWrapper.getBannerLink());
                 releaseDTO = uploadPubAppReleaseArtifacts(releaseDTO, artifact, wrapper.getDeviceType());
             } else if (app instanceof WebAppWrapper) {
                 WebAppWrapper wrapper = (WebAppWrapper) app;
                 WebAppReleaseWrapper releaseWrapper = wrapper.getWebAppReleaseWrappers().get(0);
-                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
+                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
-                        releaseWrapper.getScreenshots(), null, releaseWrapper.getBanner());
+                        null, releaseWrapper.getBannerLink());
                 releaseDTO = uploadWebAppReleaseArtifacts(releaseDTO, artifact);
             } else if (app instanceof CustomAppWrapper) {
                 CustomAppWrapper wrapper = (CustomAppWrapper) app;
                 CustomAppReleaseWrapper releaseWrapper = wrapper.getCustomAppReleaseWrappers().get(0);
-                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIcon(),
+                artifact = ApplicationManagementUtil.constructApplicationArtifact(releaseWrapper.getIconLink(), releaseWrapper.getScreenshotLinks(),
-                        releaseWrapper.getScreenshots(), releaseWrapper.getBinaryFile(), releaseWrapper.getBanner());
+                        releaseWrapper.getArtifactLink(), releaseWrapper.getBannerLink());
                 try {
                     releaseDTO = uploadCustomAppReleaseArtifacts(releaseDTO, artifact, wrapper.getDeviceType());
                 } catch (ResourceManagementException e) {
@@ -316,6 +499,14 @@ public class ApplicationManagerImpl implements ApplicationManager {
             String msg = "Error Occurred when uploading artifacts of the web clip: " + applicationDTO.getName();
             log.error(msg);
             throw new ApplicationManagementException(msg, e);
+        } catch (MalformedURLException e) {
+            String msg = "Malformed URL link received as a downloadable link";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (FileDownloaderServiceException e) {
+            String msg = "Error encountered while downloading application release artifacts";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
         }
         applicationDTO.getApplicationReleaseDTOs().clear();
         applicationDTO.getApplicationReleaseDTOs().add(releaseDTO);
@@ -3133,11 +3324,13 @@ public class ApplicationManagerImpl implements ApplicationManager {
     }
 
     @Override
-    public ApplicationRelease updateEntAppRelease(String releaseUuid, EntAppReleaseWrapper entAppReleaseWrapper,
+    public ApplicationRelease updateEntAppRelease(String releaseUuid, EntAppReleaseWrapper entAppReleaseWrapper) throws ApplicationManagementException {
-                                                  ApplicationArtifact applicationArtifact) throws ApplicationManagementException {
 
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         try {
+            ApplicationArtifact applicationArtifact = ApplicationManagementUtil.
+                    constructApplicationArtifact(entAppReleaseWrapper.getIconLink(), entAppReleaseWrapper.getScreenshotLinks(),
+                            entAppReleaseWrapper.getArtifactLink(), entAppReleaseWrapper.getBannerLink());
             ConnectionManagerUtil.beginDBTransaction();
             ApplicationDTO applicationDTO = this.applicationDAO.getAppWithRelatedRelease(releaseUuid, tenantId);
             DeviceType deviceTypeObj = APIUtil.getDeviceTypeData(applicationDTO.getDeviceTypeId());
@@ -3204,17 +3397,25 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     + "UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
+        } catch (MalformedURLException e) {
+            throw new ApplicationManagementException("Malformed downloadable URL received for the Public app " +
+                    "release UUID: " + releaseUuid);
+        } catch (FileDownloaderServiceException e) {
+            throw new ApplicationManagementException("Error encountered while downloading artifact for the Public app " +
+                    "release UUID: " + releaseUuid);
         } finally {
             ConnectionManagerUtil.closeDBConnection();
         }
     }
 
     @Override
-    public ApplicationRelease updatePubAppRelease(String releaseUuid, PublicAppReleaseWrapper publicAppReleaseWrapper,
+    public ApplicationRelease updatePubAppRelease(String releaseUuid, PublicAppReleaseWrapper publicAppReleaseWrapper) throws ApplicationManagementException {
-                                                  ApplicationArtifact applicationArtifact) throws ApplicationManagementException {
 
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         try {
+            ApplicationArtifact applicationArtifact = ApplicationManagementUtil.
+                    constructApplicationArtifact(publicAppReleaseWrapper.getIconLink(), publicAppReleaseWrapper.getScreenshotLinks(),
+                            null, publicAppReleaseWrapper.getBannerLink());
             ConnectionManagerUtil.beginDBTransaction();
             ApplicationDTO applicationDTO = this.applicationDAO.getAppWithRelatedRelease(releaseUuid, tenantId);
             validateAppReleaseUpdating(publicAppReleaseWrapper, applicationDTO, applicationArtifact,
@@ -3273,17 +3474,25 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     + "release UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
+        } catch (MalformedURLException e) {
+            throw new ApplicationManagementException("Malformed downloadable URL received for the Public app " +
+                    "release UUID: " + releaseUuid);
+        } catch (FileDownloaderServiceException e) {
+            throw new ApplicationManagementException("Error encountered while downloading artifact for the Public app " +
+                    "release UUID: " + releaseUuid);
         } finally {
             ConnectionManagerUtil.closeDBConnection();
         }
     }
 
     @Override
-    public ApplicationRelease updateWebAppRelease(String releaseUuid, WebAppReleaseWrapper webAppReleaseWrapper,
+    public ApplicationRelease updateWebAppRelease(String releaseUuid, WebAppReleaseWrapper webAppReleaseWrapper) throws ApplicationManagementException {
-                                                  ApplicationArtifact applicationArtifact) throws ApplicationManagementException {
 
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         try {
+            ApplicationArtifact applicationArtifact = ApplicationManagementUtil.
+                    constructApplicationArtifact(webAppReleaseWrapper.getIconLink(), webAppReleaseWrapper.getScreenshotLinks(),
+                            null, webAppReleaseWrapper.getBannerLink());
             ConnectionManagerUtil.beginDBTransaction();
             ApplicationDTO applicationDTO = this.applicationDAO.getAppWithRelatedRelease(releaseUuid, tenantId);
             validateAppReleaseUpdating(webAppReleaseWrapper, applicationDTO, applicationArtifact,
@@ -3338,18 +3547,27 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     + "release UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
+        } catch (MalformedURLException e) {
+            throw new ApplicationManagementException("Malformed downloadable URL received for the Public app " +
+                    "release UUID: " + releaseUuid);
+        } catch (FileDownloaderServiceException e) {
+            throw new ApplicationManagementException("Error encountered while downloading artifact for the Public app " +
+                    "release UUID: " + releaseUuid);
         } finally {
             ConnectionManagerUtil.closeDBConnection();
         }
     }
 
     @Override
-    public ApplicationRelease updateCustomAppRelease(String releaseUuid,
+    public ApplicationRelease updateCustomAppRelease(String releaseUuid, CustomAppReleaseWrapper customAppReleaseWrapper)
-                                                     CustomAppReleaseWrapper customAppReleaseWrapper, ApplicationArtifact applicationArtifact)
             throws ApplicationManagementException {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         ApplicationStorageManager applicationStorageManager = APIUtil.getApplicationStorageManager();
         try {
+            ApplicationArtifact applicationArtifact = ApplicationManagementUtil.
+                    constructApplicationArtifact(customAppReleaseWrapper.getIconLink(),
+                            customAppReleaseWrapper.getScreenshotLinks(), customAppReleaseWrapper.getArtifactLink(),
+                            customAppReleaseWrapper.getBannerLink());
             ConnectionManagerUtil.beginDBTransaction();
             ApplicationDTO applicationDTO = this.applicationDAO.getAppWithRelatedRelease(releaseUuid, tenantId);
             AtomicReference<ApplicationReleaseDTO> applicationReleaseDTO = new AtomicReference<>(
@@ -3468,6 +3686,12 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     + "UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
+        } catch (MalformedURLException e) {
+            throw new ApplicationManagementException("Malformed downloadable URL received for the Public app " +
+                    "release UUID: " + releaseUuid);
+        } catch (FileDownloaderServiceException e) {
+            throw new ApplicationManagementException("Error encountered while downloading artifact for the Public app " +
+                    "release UUID: " + releaseUuid);
         } finally {
             ConnectionManagerUtil.closeDBConnection();
         }
@@ -3903,30 +4127,24 @@ public class ApplicationManagerImpl implements ApplicationManager {
     public void validateEntAppReleaseCreatingRequest(EntAppReleaseWrapper releaseWrapper, String deviceType)
             throws RequestValidatingException, ApplicationManagementException {
         validateReleaseCreatingRequest(releaseWrapper, deviceType);
-        validateBinaryArtifact(releaseWrapper.getBinaryFile());
-        validateImageArtifacts(releaseWrapper.getIcon(), releaseWrapper.getScreenshots());
     }
 
     @Override
     public void validateCustomAppReleaseCreatingRequest(CustomAppReleaseWrapper releaseWrapper, String deviceType)
             throws RequestValidatingException, ApplicationManagementException {
         validateReleaseCreatingRequest(releaseWrapper, deviceType);
-        validateBinaryArtifact(releaseWrapper.getBinaryFile());
-        validateImageArtifacts(releaseWrapper.getIcon(), releaseWrapper.getScreenshots());
     }
 
     @Override
     public void validateWebAppReleaseCreatingRequest(WebAppReleaseWrapper releaseWrapper)
             throws RequestValidatingException, ApplicationManagementException {
         validateReleaseCreatingRequest(releaseWrapper, Constants.ANY);
-        validateImageArtifacts(releaseWrapper.getIcon(), releaseWrapper.getScreenshots());
     }
 
     @Override
     public void validatePublicAppReleaseCreatingRequest(PublicAppReleaseWrapper releaseWrapper, String deviceType)
             throws RequestValidatingException, ApplicationManagementException {
         validateReleaseCreatingRequest(releaseWrapper, deviceType);
-        validateImageArtifacts(releaseWrapper.getIcon(), releaseWrapper.getScreenshots());
         validatePublicAppReleasePackageName(releaseWrapper.getPackageName());
     }
 

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/FileDownloaderServiceProvider.java

@@ -0,0 +1,147 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.core.impl;
+
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileMetaEntry;
+import io.entgra.device.mgt.core.application.mgt.common.TransferLink;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileDownloaderServiceException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileTransferServiceException;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileDownloaderService;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
+import io.entgra.device.mgt.core.application.mgt.core.internal.DataHolder;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+
+public class FileDownloaderServiceProvider {
+    private static final Log log = LogFactory.getLog(FileDownloaderServiceProvider.class);
+    private static final FileTransferService fileTransferService = DataHolder.getInstance().getFileTransferService();
+    private static final LocalFileDownloaderService localFileDownloaderService = new LocalFileDownloaderService();
+    private static final RemoteFileDownloaderService remoteFileDownloaderService = new RemoteFileDownloaderService();
+    public static FileDownloaderService getFileDownloaderService(URL downloadUrl) throws FileDownloaderServiceException {
+        try {
+            if (fileTransferService.isExistsOnLocal(downloadUrl)) {
+                return localFileDownloaderService;
+            }
+            return remoteFileDownloaderService;
+        } catch (FileTransferServiceException e) {
+            String msg = "Error encountered while acquiring file downloader service";
+            log.error(msg, e);
+            throw new FileDownloaderServiceException(msg, e);
+        }
+    }
+
+    /**
+     * Class holing the implementation of the local file downloading service
+     */
+    private static class LocalFileDownloaderService implements FileDownloaderService {
+        @Override
+        public FileDescriptor download(URL downloadUrl) throws FileDownloaderServiceException {
+            try {
+                return fileTransferService.resolve(downloadUrl);
+            } catch (FileTransferServiceException e) {
+                String msg = "Error encountered while downloading file pointing by " + downloadUrl;
+                log.error(msg, e);
+                throw new FileDownloaderServiceException(msg, e);
+            }
+        }
+    }
+
+    /**
+     * Class holing the implementation of the remote file downloading service
+     */
+    private static class RemoteFileDownloaderService implements FileDownloaderService {
+        private static final OkHttpClient okhttpClient =
+                new OkHttpClient.Builder().connectTimeout(500, TimeUnit.MILLISECONDS).build();
+        @Override
+        public FileDescriptor download(URL downloadUrl) throws FileDownloaderServiceException {
+            FileMetaEntry fileMetaEntry = getFileMetaEntry(downloadUrl);
+            try {
+                TransferLink transferLink = fileTransferService.generateUploadLink(fileMetaEntry);
+                FileDescriptor fileDescriptor = fileTransferService.resolve(new URL(transferLink.getDirectTransferLink()
+                        + "/" + fileMetaEntry.getFileName() + "." + fileMetaEntry.getExtension()));
+                FileUtils.copyURLToFile(downloadUrl, new File(fileDescriptor.getAbsolutePath()),
+                        15000, 3600000);
+                return fileDescriptor;
+            } catch (FileTransferServiceException | IOException e) {
+                String msg = "Error encountered while downloading file";
+                log.error(msg, e);
+                throw new FileDownloaderServiceException(msg, e);
+            }
+        }
+
+        /**
+         * Generate the {@link FileMetaEntry} from the remote file
+         * @param downloadUrl Remote file URL
+         * @return {@link FileMetaEntry}
+         * @throws FileDownloaderServiceException Throws when error encountered while generating {@link FileMetaEntry}
+         */
+        private FileMetaEntry getFileMetaEntry(URL downloadUrl) throws FileDownloaderServiceException {
+            Request request = new Request.Builder().url(downloadUrl).head().build();
+            try (Response response = okhttpClient.newCall(request).execute()) {
+                if (!response.isSuccessful()) {
+                    throw new FileDownloaderServiceException("Unexpected response code received for the remote url " + downloadUrl);
+                }
+                String contentDisposition = response.header("Content-Disposition");
+                String[] fileNameSegments = getFileNameSegments(contentDisposition);
+                FileMetaEntry fileMetaEntry = new FileMetaEntry();
+                fileMetaEntry.setSize(Long.parseLong(Objects.requireNonNull(response.header("Content-Length"))));
+                fileMetaEntry.setFileName(fileNameSegments[0] + "-" + UUID.randomUUID());
+                fileMetaEntry.setExtension(fileNameSegments[1]);
+                return fileMetaEntry;
+            } catch (IOException e) {
+                throw new FileDownloaderServiceException("IO error occurred while constructing file name for the remote url " + downloadUrl);
+            }
+        }
+
+        /**
+         * Extract file name segments(filename & extensions) from content disposition header
+         * @param contentDisposition Content disposition header value
+         * @return Array of name segments
+         * @throws FileDownloaderServiceException Throws when error occurred while extracting name segments
+         */
+        private static String[] getFileNameSegments(String contentDisposition) throws FileDownloaderServiceException {
+            if (contentDisposition == null) {
+                throw new FileDownloaderServiceException("Cannot determine the file name for the remote file");
+            }
+            String []contentDispositionSegments = contentDisposition.split("=");
+            if (contentDispositionSegments.length != 2) {
+                throw new FileDownloaderServiceException("Error encountered when constructing file name");
+            }
+            String fullQualifiedName = contentDispositionSegments[contentDispositionSegments.length - 1].replace("\"", "");
+            String []fileNameSegments = fullQualifiedName.split("\\.(?=[^.]+$)");
+            if (fileNameSegments.length != 2) {
+                throw new FileDownloaderServiceException("Error encountered when constructing file name");
+            }
+            return fileNameSegments;
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/FileTransferServiceImpl.java

@@ -0,0 +1,124 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.core.impl;
+
+import io.entgra.device.mgt.core.application.mgt.common.ChunkDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileMetaEntry;
+import io.entgra.device.mgt.core.application.mgt.common.TransferLink;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileTransferServiceException;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
+import io.entgra.device.mgt.core.application.mgt.core.exception.FileTransferServiceHelperUtilException;
+import io.entgra.device.mgt.core.application.mgt.core.util.FileTransferServiceHelperUtil;
+import io.entgra.device.mgt.core.device.mgt.common.exceptions.NotFoundException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+
+public class FileTransferServiceImpl implements FileTransferService {
+    private final static Log log = LogFactory.getLog(FileTransferServiceImpl.class);
+    private static volatile FileTransferServiceImpl INSTANCE;
+
+    private FileTransferServiceImpl() throws FileTransferServiceException {
+        try {
+            FileTransferServiceHelperUtil.createDefaultRootStructure();
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Error occurred while initializing file transfer service";
+            log.error(msg, e);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+
+    public static FileTransferService getInstance() throws FileTransferServiceException{
+        if (INSTANCE == null) {
+            synchronized (FileTransferServiceImpl.class) {
+                if (INSTANCE == null) {
+                    INSTANCE = new FileTransferServiceImpl();
+                }
+            }
+        }
+        return INSTANCE;
+    }
+
+    @Override
+    public TransferLink generateUploadLink(FileMetaEntry fileMetaEntry) throws FileTransferServiceException {
+        try {
+            Path artifactHolder = FileTransferServiceHelperUtil.createNewArtifactHolder(fileMetaEntry);
+            String []pathSegments = artifactHolder.toString().split(FileSystems.getDefault().getSeparator());
+            TransferLink.TransferLinkBuilder transferLinkBuilder =
+                    new TransferLink.TransferLinkBuilder(pathSegments[pathSegments.length - 1]);
+            return transferLinkBuilder.build();
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Error encountered while generating upload link";
+            log.error(msg, e);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+
+    @Override
+    public ChunkDescriptor resolve(String artifactHolder, InputStream chunk) throws FileTransferServiceException, NotFoundException {
+        ChunkDescriptor chunkDescriptor = new ChunkDescriptor();
+        try {
+            FileTransferServiceHelperUtil.populateChunkDescriptor(artifactHolder, chunk, chunkDescriptor);
+            return chunkDescriptor;
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Error occurred while resolving chuck descriptor for " + artifactHolder;
+            log.error(msg);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+
+    @Override
+    public void writeChunk(ChunkDescriptor chunkDescriptor) throws FileTransferServiceException {
+        try {
+            FileTransferServiceHelperUtil.writeChunk(chunkDescriptor);
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Failed to write data to artifact located in " + chunkDescriptor.getAssociateFileDescriptor().getAbsolutePath();
+            log.error(msg);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+
+    @Override
+    public boolean isExistsOnLocal(URL downloadUrl) throws FileTransferServiceException {
+        try {
+            return FileTransferServiceHelperUtil.resolve(downloadUrl) != null;
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Error occurred while checking the existence of artifact on the local environment";
+            log.error(msg, e);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+
+    @Override
+    public FileDescriptor resolve(URL downloadUrl) throws FileTransferServiceException {
+        try {
+            return FileTransferServiceHelperUtil.resolve(downloadUrl);
+        } catch (FileTransferServiceHelperUtilException e) {
+            String msg = "Error occurred while resolving file descriptor pointing from " + downloadUrl;
+            log.error(msg, e);
+            throw new FileTransferServiceException(msg, e);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/internal/ApplicationManagementServiceComponent.java

@@ -21,6 +21,7 @@ import io.entgra.device.mgt.core.application.mgt.common.config.LifecycleState;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.AppmDataHandler;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
 import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
@@ -28,6 +29,7 @@ import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationM
 import io.entgra.device.mgt.core.application.mgt.core.config.ConfigurationManager;
 import io.entgra.device.mgt.core.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
 import io.entgra.device.mgt.core.application.mgt.core.impl.AppmDataHandlerImpl;
+import io.entgra.device.mgt.core.application.mgt.core.impl.FileTransferServiceImpl;
 import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
 import io.entgra.device.mgt.core.application.mgt.core.task.ScheduledAppSubscriptionTaskManager;
 import io.entgra.device.mgt.core.application.mgt.core.util.ApplicationManagementUtil;
@@ -123,6 +125,10 @@ public class ApplicationManagementServiceComponent {
             DataHolder.getInstance().setVppApplicationManager(vppApplicationManager);
             bundleContext.registerService(VPPApplicationManager.class.getName(), vppApplicationManager, null);
 
+            FileTransferService fileTransferService = FileTransferServiceImpl.getInstance();
+            DataHolder.getInstance().setFileTransferService(fileTransferService);
+            bundleContext.registerService(FileTransferService.class.getName(), fileTransferService, null);
+
             ScheduledAppSubscriptionTaskManager taskManager = new ScheduledAppSubscriptionTaskManager();
             taskManager.scheduleCleanupTask();
 

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/internal/DataHolder.java

@@ -20,6 +20,7 @@ package io.entgra.device.mgt.core.application.mgt.core.internal;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.AppmDataHandler;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
 import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
@@ -55,6 +56,7 @@ public class DataHolder {
     private AppmDataHandler configManager;
 
     private TaskService taskService;
+    private FileTransferService fileTransferService;
 
     private static final DataHolder applicationMgtDataHolder = new DataHolder();
 
@@ -153,4 +155,12 @@ public class DataHolder {
     public void setVppApplicationManager(VPPApplicationManager vppApplicationManager) {
         this.vppApplicationManager = vppApplicationManager;
     }
+
+    public FileTransferService getFileTransferService() {
+        return fileTransferService;
+    }
+
+    public void setFileTransferService(FileTransferService fileTransferService) {
+        this.fileTransferService = fileTransferService;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/APIUtil.java

@@ -74,6 +74,7 @@ public class APIUtil {
     private static volatile AppmDataHandler appmDataHandler;
     private static volatile VPPApplicationManager vppApplicationManager;
     private static volatile MetadataManagementService metadataManagementService;
+    private static volatile FileTransferService fileTransferService;
 
     public static SPApplicationManager getSPApplicationManager() {
         if (SPApplicationManager == null) {
@@ -591,4 +592,16 @@ public class APIUtil {
         }
         return metadataManagementService;
     }
+
+    public static FileTransferService getFileTransferService() {
+        if (fileTransferService == null) {
+            synchronized (APIUtil.class) {
+                if (fileTransferService == null) {
+                    PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+                    fileTransferService = (FileTransferService) ctx.getOSGiService(FileTransferService.class, null);
+                }
+            }
+        }
+        return fileTransferService;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/ApplicationManagementUtil.java

@@ -19,16 +19,20 @@ package io.entgra.device.mgt.core.application.mgt.core.util;
 
 import io.entgra.device.mgt.core.application.mgt.common.ApplicationArtifact;
 import io.entgra.device.mgt.core.application.mgt.common.FileDataHolder;
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
 import io.entgra.device.mgt.core.application.mgt.common.LifecycleChanger;
 import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationDTO;
 import io.entgra.device.mgt.core.application.mgt.common.dto.ItuneAppDTO;
 import io.entgra.device.mgt.core.application.mgt.common.exception.ApplicationManagementException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileDownloaderServiceException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.FileTransferServiceException;
 import io.entgra.device.mgt.core.application.mgt.common.exception.InvalidConfigurationException;
 import io.entgra.device.mgt.core.application.mgt.common.exception.RequestValidatingException;
 import io.entgra.device.mgt.core.application.mgt.common.response.Application;
 import io.entgra.device.mgt.core.application.mgt.common.response.Category;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
 import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
@@ -45,10 +49,12 @@ import io.entgra.device.mgt.core.application.mgt.common.wrapper.WebAppWrapper;
 import io.entgra.device.mgt.core.application.mgt.core.config.ConfigurationManager;
 import io.entgra.device.mgt.core.application.mgt.core.config.Extension;
 import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestException;
+import io.entgra.device.mgt.core.application.mgt.core.impl.FileDownloaderServiceProvider;
 import io.entgra.device.mgt.core.application.mgt.core.impl.VppApplicationManagerImpl;
 import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
 import io.entgra.device.mgt.core.device.mgt.common.Base64File;
 import io.entgra.device.mgt.core.device.mgt.common.DeviceManagementConstants;
+import io.entgra.device.mgt.core.device.mgt.common.app.mgt.App;
 import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.MetadataManagementService;
 import io.entgra.device.mgt.core.device.mgt.core.common.util.FileUtil;
 import io.entgra.device.mgt.core.device.mgt.core.metadata.mgt.MetadataManagementServiceImpl;
@@ -159,6 +165,49 @@ public class ApplicationManagementUtil {
         return applicationArtifact;
     }
 
+    public static ApplicationArtifact constructApplicationArtifact(String iconLink, List<String> screenshotLinks, String artifactLink, String bannerLink)
+            throws MalformedURLException, FileDownloaderServiceException {
+        ApplicationArtifact applicationArtifact = new ApplicationArtifact();
+        FileDescriptor fileDescriptor;
+        if (artifactLink != null) {
+            URL artifactLinkUrl = new URL(artifactLink);
+            fileDescriptor = FileDownloaderServiceProvider.getFileDownloaderService(artifactLinkUrl).download(artifactLinkUrl);
+            applicationArtifact.setInstallerName(fileDescriptor.getFullQualifiedName());
+            applicationArtifact.setInstallerStream(fileDescriptor.getFile());
+        }
+
+        if (iconLink != null) {
+            URL iconLinkUrl = new URL(iconLink);
+            fileDescriptor = FileDownloaderServiceProvider.getFileDownloaderService(iconLinkUrl).download(iconLinkUrl);
+            applicationArtifact.setIconName(fileDescriptor.getFullQualifiedName());
+            applicationArtifact.setIconStream(fileDescriptor.getFile());
+        }
+
+        if (bannerLink != null) {
+            URL bannerLinkUrl = new URL(bannerLink);
+            fileDescriptor = FileDownloaderServiceProvider.getFileDownloaderService(bannerLinkUrl).download(bannerLinkUrl);
+            applicationArtifact.setBannerName(fileDescriptor.getFullQualifiedName());
+            applicationArtifact.setBannerStream(fileDescriptor.getFile());
+        }
+
+        if (screenshotLinks != null) {
+            Map<String, InputStream> screenshotData = new TreeMap<>();
+            // This is to handle cases in which multiple screenshots have the same name
+            Map<String, Integer> screenshotNameCount = new HashMap<>();
+            URL screenshotLinkUrl;
+            for (String screenshotLink : screenshotLinks) {
+                screenshotLinkUrl = new URL(screenshotLink);
+                fileDescriptor = FileDownloaderServiceProvider.getFileDownloaderService(screenshotLinkUrl).download(screenshotLinkUrl);
+                String screenshotName = fileDescriptor.getFullQualifiedName();
+                screenshotNameCount.put(screenshotName, screenshotNameCount.getOrDefault(screenshotName, 0) + 1);
+                screenshotName = FileUtil.generateDuplicateFileName(screenshotName, screenshotNameCount.get(screenshotName));
+                screenshotData.put(screenshotName, fileDescriptor.getFile());
+            }
+            applicationArtifact.setScreenshots(screenshotData);
+        }
+        return applicationArtifact;
+    }
+
     /**
      *
      * @param base64File Base64File that should be converted to FileDataHolder bean
@@ -251,6 +300,41 @@ public class ApplicationManagementUtil {
         throw new IllegalArgumentException("Provided bean does not belong to an Application Wrapper");
     }
 
+    public static <T> boolean getRemoteStatus(T appWrapper) {
+        if (!isReleaseAvailable(appWrapper)) {
+            return false;
+        }
+        if (appWrapper instanceof ApplicationWrapper) {
+            return getRemoteStatusFromWrapper(((ApplicationWrapper) appWrapper).getEntAppReleaseWrappers().get(0));
+        }
+        if (appWrapper instanceof PublicAppWrapper) {
+            return getRemoteStatusFromWrapper(((PublicAppWrapper) appWrapper).getPublicAppReleaseWrappers().get(0));
+        }
+        if (appWrapper instanceof WebAppWrapper) {
+            return getRemoteStatusFromWrapper(((WebAppWrapper) appWrapper).getWebAppReleaseWrappers().get(0));
+        }
+        if (appWrapper instanceof CustomAppWrapper) {
+            return getRemoteStatusFromWrapper(((CustomAppWrapper) appWrapper).getCustomAppReleaseWrappers().get(0));
+        }
+        throw new IllegalArgumentException("Provided bean does not belong to an Application Wrapper");
+    }
+
+    public static <T> boolean getRemoteStatusFromWrapper(T releaseWrapper) {
+        if (releaseWrapper instanceof EntAppReleaseWrapper) {
+            return ((EntAppReleaseWrapper) releaseWrapper).isRemoteStatus();
+        }
+        if (releaseWrapper instanceof PublicAppReleaseWrapper) {
+            return ((PublicAppReleaseWrapper) releaseWrapper).isRemoteStatus();
+        }
+        if (releaseWrapper instanceof WebAppReleaseWrapper) {
+            return ((WebAppReleaseWrapper) releaseWrapper).isRemoteStatus();
+        }
+        if (releaseWrapper instanceof CustomAppReleaseWrapper) {
+            return ((CustomAppReleaseWrapper) releaseWrapper).isRemoteStatus();
+        }
+        throw new IllegalArgumentException("Provided bean does not belong to an Release Wrapper");
+    }
+
     public static <T> T getInstance(Extension extension, Class<T> cls) throws InvalidConfigurationException {
         try {
             Class theClass = Class.forName(extension.getClassName());
@@ -279,13 +363,12 @@ public class ApplicationManagementUtil {
         ApplicationManager applicationManager = APIUtil.getApplicationManager();
         List<Category> categories = applicationManager.getRegisteredCategories();
         if (product != null && product.getVersion() != null) {
-            // Generate artifacts
-            ApplicationArtifact applicationArtifact = generateArtifacts(product);
 
             List<String> packageNamesOfApps = new ArrayList<>();
             packageNamesOfApps.add(product.getPackageName());
 
             List<Application> existingApps = applicationManager.getApplications(packageNamesOfApps);
+            PublicAppReleaseWrapper publicAppReleaseWrapper = generatePublicAppReleaseWrapper(product);
 
             if (existingApps != null && existingApps.size() > 0) {
                 Application app = existingApps.get(0);
@@ -293,7 +376,6 @@ public class ApplicationManagementUtil {
                     ApplicationUpdateWrapper applicationUpdateWrapper = generatePubAppUpdateWrapper(product, categories);
                     applicationManager.updateApplication(app.getId(), applicationUpdateWrapper);
 
-                    PublicAppReleaseWrapper publicAppReleaseWrapper = new PublicAppReleaseWrapper();
                     if (app.getSubMethod()
                             .equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
                         publicAppReleaseWrapper.setPrice(0.0);
@@ -306,56 +388,48 @@ public class ApplicationManagementUtil {
                     publicAppReleaseWrapper.setVersion(product.getVersion());
                     publicAppReleaseWrapper.setSupportedOsVersions("4.0-12.3");
                     applicationManager.updatePubAppRelease(app.getApplicationReleases().get(0).getUuid(),
-                            publicAppReleaseWrapper, applicationArtifact);
+                            publicAppReleaseWrapper);
                     return;
                 }
             } else {
 
                 // Generate App wrapper
                 PublicAppWrapper publicAppWrapper = generatePubAppWrapper(product, categories);
-                PublicAppReleaseWrapper appReleaseWrapper = new PublicAppReleaseWrapper();
-
-                if (publicAppWrapper.getSubMethod()
-                        .equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
-                    appReleaseWrapper.setPrice(0.0);
-                } else {
-                    appReleaseWrapper.setPrice(1.0);
-                }
-
-                appReleaseWrapper.setDescription(product.getDescription());
-                appReleaseWrapper.setReleaseType("ga");
-                appReleaseWrapper.setVersion(product.getVersion());
-                appReleaseWrapper.setPackageName(product.getPackageName());
-                appReleaseWrapper.setSupportedOsVersions("4.0-12.3");
 
                 publicAppWrapper.setPublicAppReleaseWrappers(
-                        Arrays.asList(new PublicAppReleaseWrapper[]{appReleaseWrapper}));
+                        Arrays.asList(new PublicAppReleaseWrapper[]{publicAppReleaseWrapper}));
-
+
-                try {
+                Application application = applicationManager.createApplication(publicAppWrapper, false);
-                    updateImages(appReleaseWrapper, applicationArtifact.getIconName(),
+                if (application != null && (application.getApplicationReleases().get(0).getCurrentStatus() == null
-                            applicationArtifact.getIconStream(), applicationArtifact.getScreenshots());
+                        || application.getApplicationReleases().get(0).getCurrentStatus().equals("CREATED"))) {
-
+                    String uuid = application.getApplicationReleases().get(0).getUuid();
-                    Application application = applicationManager.createApplication(publicAppWrapper, false);
+                    LifecycleChanger lifecycleChanger = new LifecycleChanger();
-                    if (application != null && (application.getApplicationReleases().get(0).getCurrentStatus() == null
+                    lifecycleChanger.setAction("IN-REVIEW");
-                            || application.getApplicationReleases().get(0).getCurrentStatus().equals("CREATED"))) {
+                    applicationManager.changeLifecycleState(uuid, lifecycleChanger);
-                        String uuid = application.getApplicationReleases().get(0).getUuid();
+                    lifecycleChanger.setAction("APPROVED");
-                        LifecycleChanger lifecycleChanger = new LifecycleChanger();
+                    applicationManager.changeLifecycleState(uuid, lifecycleChanger);
-                        lifecycleChanger.setAction("IN-REVIEW");
+                    lifecycleChanger.setAction("PUBLISHED");
-                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
+                    applicationManager.changeLifecycleState(uuid, lifecycleChanger);
-                        lifecycleChanger.setAction("APPROVED");
-                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
-                        lifecycleChanger.setAction("PUBLISHED");
-                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
-                    }
-                } catch (IOException e) {
-                    String msg = "Error while downloading images of release.";
-                    log.error(msg);
-                    throw new ApplicationManagementException(msg, e);
                 }
             }
         }
     }
 
+    private static PublicAppReleaseWrapper generatePublicAppReleaseWrapper(ItuneAppDTO product) {
+        PublicAppReleaseWrapper publicAppReleaseWrapper = new PublicAppReleaseWrapper();
+        publicAppReleaseWrapper.setDescription(product.getDescription());
+        publicAppReleaseWrapper.setReleaseType("ga");
+        publicAppReleaseWrapper.setVersion(product.getVersion());
+        publicAppReleaseWrapper.setPackageName(product.getPackageName());
+        publicAppReleaseWrapper.setSupportedOsVersions("4.0-12.3");
+        publicAppReleaseWrapper.setIconLink(product.getIconURL());
+        publicAppReleaseWrapper.setRemoteStatus(false);
+        List<String> screenshotUrls = new ArrayList<>(Collections.nCopies(3, product.getIconURL()));
+        publicAppReleaseWrapper.setScreenshotLinks(screenshotUrls);
+        publicAppReleaseWrapper.setPrice(1.0);
+        return publicAppReleaseWrapper;
+    }
+
     private static PublicAppWrapper generatePubAppWrapper(ItuneAppDTO product, List<Category> categories) {
         PublicAppWrapper publicAppWrapper = new PublicAppWrapper();
         publicAppWrapper.setName(product.getTitle());
@@ -560,4 +634,19 @@ public class ApplicationManagementUtil {
             return sanitizedName;
         }
     }
+
+    public static <T> List<?> deriveApplicationWithoutRelease(T app) {
+        List<?> releaseWrappers = null;
+        if (app instanceof ApplicationWrapper) {
+            ApplicationWrapper applicationWrapper = (ApplicationWrapper) app;
+            releaseWrappers = applicationWrapper.getEntAppReleaseWrappers();
+            applicationWrapper.setEntAppReleaseWrappers(Collections.emptyList());
+        }
+        if (app instanceof CustomAppWrapper) {
+            CustomAppWrapper applicationWrapper = (CustomAppWrapper) app;
+            releaseWrappers = applicationWrapper.getCustomAppReleaseWrappers();
+            applicationWrapper.setCustomAppReleaseWrappers(Collections.emptyList());
+        }
+        return releaseWrappers;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/FileTransferServiceHelperUtil.java

@@ -0,0 +1,236 @@
+/*
+ *  Copyright (c) 2018 - 2024, 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.application.mgt.core.util;
+
+import com.google.gson.Gson;
+import io.entgra.device.mgt.core.application.mgt.common.ChunkDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileMetaEntry;
+import io.entgra.device.mgt.core.application.mgt.core.exception.FileTransferServiceHelperUtilException;
+import io.entgra.device.mgt.core.device.mgt.common.exceptions.NotFoundException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.Objects;
+import java.util.UUID;
+
+public class FileTransferServiceHelperUtil {
+    private static final Log log = LogFactory.getLog(FileTransferServiceHelperUtil.class);
+    private static final String ROOT = "iot-artifact-holder";
+    private static final String SYSTEM_PROPERTY_TEMP_DIR = "java.io.tmpdir";
+    private static final String META_ENTRY_FILE_NAME = ".meta.json";
+    private static final Gson gson = new Gson();
+    public static void createDefaultRootStructure() throws FileTransferServiceHelperUtilException {
+        try {
+            Path root = Paths.get(System.getProperty(SYSTEM_PROPERTY_TEMP_DIR), ROOT);
+            if (Files.notExists(root)) {
+                setMinimumPermissions(Files.createDirectory(root));
+            }
+
+            if (!Files.isDirectory(root)) {
+                throw new FileTransferServiceHelperUtilException(root.toAbsolutePath() + " is not a directory");
+            }
+            setMinimumPermissions(root);
+        } catch (IOException e) {
+            String msg = "Error encountered while creating default artifact root structure";
+            log.error(msg, e);
+            throw new FileTransferServiceHelperUtilException(msg, e);
+        }
+    }
+
+    public static Path createNewArtifactHolder(FileMetaEntry fileMetaEntry) throws FileTransferServiceHelperUtilException {
+        try {
+            Path artifactHolder = Paths.get(System.getProperty(SYSTEM_PROPERTY_TEMP_DIR), ROOT, UUID.randomUUID().toString());
+            if (Files.exists(artifactHolder)) {
+                throw new FileTransferServiceHelperUtilException("Artifact holder already exists in " + artifactHolder);
+            }
+            setMinimumPermissions(Files.createDirectory(artifactHolder));
+            createMetaEntry(fileMetaEntry, artifactHolder);
+            createArtifactFile(fileMetaEntry, artifactHolder);
+            return artifactHolder;
+        } catch (IOException e) {
+            String msg = "Error occurred while creating artifact holder";
+            log.error(msg, e);
+            throw new FileTransferServiceHelperUtilException(msg, e);
+        }
+    }
+
+    public static void populateChunkDescriptor(String artifactHolder, InputStream chunk, ChunkDescriptor chunkDescriptor)
+            throws FileTransferServiceHelperUtilException, NotFoundException {
+        Path holder = locateArtifactHolder(artifactHolder);
+        Path metaEntry = locateMetaEntry(holder);
+        chunkDescriptor.setChunk(chunk);
+        FileDescriptor fileDescriptor = new FileDescriptor();
+        populateFileDescriptor(metaEntry, holder, fileDescriptor);
+        chunkDescriptor.setAssociateFileDescriptor(fileDescriptor);
+    }
+
+    public static void populateFileDescriptor(String artifactHolder, FileDescriptor fileDescriptor)
+            throws FileTransferServiceHelperUtilException, NotFoundException {
+        Path holder = locateArtifactHolder(artifactHolder);
+        Path metaEntry = locateMetaEntry(holder);
+        populateFileDescriptor(metaEntry, holder, fileDescriptor);
+    }
+
+    public static void populateFileDescriptor(Path metaEntry, Path artifactHolder, FileDescriptor fileDescriptor) throws FileTransferServiceHelperUtilException {
+        try {
+            byte []metaEntryByteContent = Files.readAllBytes(metaEntry);
+            FileMetaEntry fileMetaEntry = gson.fromJson(new String(metaEntryByteContent, StandardCharsets.UTF_8), FileMetaEntry.class);
+            fileDescriptor.setFileName(fileMetaEntry.getFileName());
+            fileDescriptor.setActualFileSize(fileMetaEntry.getSize());
+            fileDescriptor.setFullQualifiedName(fileMetaEntry.getFileName() + "." + fileMetaEntry.getExtension());
+            Path artifact = artifactHolder.resolve(fileDescriptor.getFullQualifiedName());
+            fileDescriptor.setAbsolutePath(artifact.toAbsolutePath().toString());
+            fileDescriptor.setExtension(fileMetaEntry.getExtension());
+            fileDescriptor.setFile(Files.newInputStream(artifact));
+        } catch (IOException e) {
+            String msg = "Error encountered while populating chuck descriptor";
+            log.error(msg, e);
+            throw new FileTransferServiceHelperUtilException(msg, e);
+        }
+    }
+
+    private static Path locateArtifactHolder(String artifactHolder) throws FileTransferServiceHelperUtilException, NotFoundException {
+        Path holder = Paths.get(System.getProperty(SYSTEM_PROPERTY_TEMP_DIR), ROOT, artifactHolder);
+        if (Files.notExists(holder)) {
+            throw new NotFoundException(holder.toAbsolutePath() + " is not exists");
+        }
+
+        if (!Files.isDirectory(holder)) {
+            throw new FileTransferServiceHelperUtilException(holder.toFile().getAbsolutePath() + " is not a directory");
+        }
+        return holder;
+    }
+
+    private static Path locateMetaEntry(Path artifactHolder) throws FileTransferServiceHelperUtilException {
+        Path metaEntry = artifactHolder.resolve(META_ENTRY_FILE_NAME);
+        if (Files.notExists(metaEntry) || Files.isDirectory(metaEntry)) {
+            throw new FileTransferServiceHelperUtilException("Can't locate " + META_ENTRY_FILE_NAME);
+        }
+
+        if (!Files.isReadable(metaEntry)) {
+            throw new FileTransferServiceHelperUtilException("Unreadable " + META_ENTRY_FILE_NAME);
+        }
+        return metaEntry;
+    }
+
+    public static void writeChunk(ChunkDescriptor chunkDescriptor) throws FileTransferServiceHelperUtilException {
+        if (chunkDescriptor == null) {
+            throw new FileTransferServiceHelperUtilException("Received null for chuck descriptor");
+        }
+        FileDescriptor fileDescriptor = chunkDescriptor.getAssociateFileDescriptor();
+        if (fileDescriptor == null) {
+            throw new FileTransferServiceHelperUtilException("Target file descriptor is missing for retrieved chunk");
+        }
+        Path artifact = Paths.get(fileDescriptor.getAbsolutePath());
+        try {
+            InputStream chuckStream = chunkDescriptor.getChunk();
+            byte []chunk = new byte[chuckStream.available()];
+            chuckStream.read(chunk);
+            Files.write(artifact, chunk, StandardOpenOption.CREATE, StandardOpenOption.SYNC, StandardOpenOption.APPEND);
+        } catch (IOException e) {
+            String msg = "Error encountered while writing to the " + artifact;
+            log.error(msg, e);
+            throw new FileTransferServiceHelperUtilException(msg, e);
+        }
+    }
+
+    public static FileDescriptor resolve(URL downloadUrl) throws FileTransferServiceHelperUtilException {
+        if (downloadUrl == null) {
+            throw new FileTransferServiceHelperUtilException("Received null for download url");
+        }
+
+        if (!Objects.equals(System.getProperty("iot.gateway.host"), downloadUrl.getHost())) {
+            if (log.isDebugEnabled()) {
+                log.debug("Host not match with " + System.getProperty("iot.gateway.host"));
+            }
+            return null;
+        }
+
+        String []urlPathSegments = downloadUrl.getPath().split("/");
+        if (urlPathSegments.length < 2) {
+            if (log.isDebugEnabled()) {
+                log.debug("URL patch segments contain less than 2 segments");
+            }
+            return null;
+        }
+
+        String file = urlPathSegments[urlPathSegments.length - 1];
+        String artifactHolder = urlPathSegments[urlPathSegments.length - 2];
+        try {
+            FileDescriptor fileDescriptor = new FileDescriptor();
+            populateFileDescriptor(artifactHolder, fileDescriptor);
+            if (!Objects.equals(file, fileDescriptor.getFullQualifiedName())) {
+                if (log.isDebugEnabled()) {
+                    log.debug("File name not equal to the file exists in the local");
+                }
+                return null;
+            }
+            return fileDescriptor;
+        } catch (NotFoundException e) {
+            if (log.isDebugEnabled()) {
+                log.debug("Local URL not found in the system");
+            }
+            return null;
+        }
+    }
+
+    private static void setMinimumPermissions(Path path) throws FileTransferServiceHelperUtilException {
+        File file = path.toFile();
+        if (!file.setReadable(true, true)) {
+            throw new FileTransferServiceHelperUtilException("Failed to set read permission for " + file.getAbsolutePath());
+        }
+
+        if (!file.setWritable(true, true)) {
+            throw new FileTransferServiceHelperUtilException("Failed to set write permission for " + file.getAbsolutePath());
+        }
+    }
+
+    private static void createMetaEntry(FileMetaEntry fileMetaEntry, Path artifactHolder) throws FileTransferServiceHelperUtilException {
+        try {
+            Path metaEntry = artifactHolder.resolve(META_ENTRY_FILE_NAME);
+            String fileMetaJsonContent = gson.toJson(fileMetaEntry);
+            Files.write(metaEntry, fileMetaJsonContent.getBytes(StandardCharsets.UTF_8),
+                    StandardOpenOption.CREATE, StandardOpenOption.SYNC);
+        } catch (IOException e) {
+            throw new FileTransferServiceHelperUtilException("Error encountered while creating meta entry", e);
+        }
+    }
+
+    private static void createArtifactFile(FileMetaEntry fileMetaEntry, Path artifactHolder) throws FileTransferServiceHelperUtilException {
+        try {
+            Path artifactFile = artifactHolder.resolve(fileMetaEntry.getFileName() + "." + fileMetaEntry.getExtension());
+            fileMetaEntry.setAbsolutePath(artifactFile.toAbsolutePath().toString());
+            Files.createFile(artifactFile);
+            setMinimumPermissions(artifactFile);
+        } catch (IOException e) {
+            throw new FileTransferServiceHelperUtilException("Error encountered while creating artifact file", e);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/test/java/io/entgra/device/mgt/core/application/mgt/core/management/ApplicationManagementTest.java

@@ -19,8 +19,13 @@ package io.entgra.device.mgt.core.application.mgt.core.management;
 
 import io.entgra.device.mgt.core.application.mgt.common.ApplicationArtifact;
 import io.entgra.device.mgt.core.application.mgt.common.ApplicationList;
+import io.entgra.device.mgt.core.application.mgt.common.ChunkDescriptor;
+import io.entgra.device.mgt.core.application.mgt.common.FileMetaEntry;
 import io.entgra.device.mgt.core.application.mgt.common.Filter;
 import io.entgra.device.mgt.core.application.mgt.common.LifecycleState;
+import io.entgra.device.mgt.core.application.mgt.common.TransferLink;
+import io.entgra.device.mgt.core.application.mgt.common.services.FileTransferService;
+import io.entgra.device.mgt.core.application.mgt.core.impl.FileTransferServiceImpl;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.cxf.jaxrs.ext.multipart.Attachment;
@@ -52,6 +57,10 @@ import io.entgra.device.mgt.core.device.mgt.core.dto.DeviceTypeVersion;
 import io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderServiceImpl;
 
 import java.io.File;
+import java.io.FileInputStream;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -104,26 +113,66 @@ public class ApplicationManagementTest extends BaseTestCase {
         releaseWrapper.setSupportedOsVersions("4.0-7.0");
 
 
-        File banner = new File("src/test/resources/samples/app1/banner1.jpg");
+        FileTransferService fileTransferService = FileTransferServiceImpl.getInstance();
-        File icon =  new File("src/test/resources/samples/app1/icon.png");
+        DataHolder.getInstance().setFileTransferService(fileTransferService);
-        File ss1 = new File("src/test/resources/samples/app1/shot1.png");
+
-        File ss2 = new File("src/test/resources/samples/app1/shot2.png");
+        FileMetaEntry metaEntry = new FileMetaEntry();
-        File ss3 = new File("src/test/resources/samples/app1/shot3.png");
+        TransferLink transferLink;
-
+        String []segments;
-        Base64File bannerBase64 = new Base64File("banner", FileUtil.fileToBase64String(banner));
+        ChunkDescriptor chunkDescriptor;
-        Base64File iconBase64 = new Base64File("icon", FileUtil.fileToBase64String(icon));
+
-        Base64File ss1Base64 = new Base64File("ss1", FileUtil.fileToBase64String(ss1));
+        metaEntry.setFileName("banner1");
-        Base64File ss2Base64 = new Base64File("ss2", FileUtil.fileToBase64String(ss2));
+        metaEntry.setExtension("jpg");
-        Base64File ss3Base64 = new Base64File("ss3", FileUtil.fileToBase64String(ss3));
+        metaEntry.setSize(179761);
-
+        transferLink = fileTransferService.generateUploadLink(metaEntry);
-        File apk = new File("src/test/resources/samples/app1/sample.apk");
+        segments = transferLink.getRelativeTransferLink().split("/");
-        Base64File apkBase64 = new Base64File("apk", FileUtil.fileToBase64String(apk));
+        chunkDescriptor = fileTransferService.
-
+                resolve(segments[segments.length-1], Files.newInputStream(
-
+                        Paths.get("src/test/resources/samples/app1/banner1.jpg")));
-        releaseWrapper.setBanner(bannerBase64);
+        fileTransferService.writeChunk(chunkDescriptor);
-        releaseWrapper.setIcon(iconBase64);
+        releaseWrapper.setBannerLink(transferLink.getDirectTransferLink() + "/banner1.jpg");
-        releaseWrapper.setBinaryFile(apkBase64);
+
-        releaseWrapper.setScreenshots(Arrays.asList(ss1Base64, ss2Base64, ss3Base64));
+        metaEntry.setFileName("icon");
+        metaEntry.setExtension("png");
+        metaEntry.setSize(41236);
+        transferLink = fileTransferService.generateUploadLink(metaEntry);
+        segments = transferLink.getRelativeTransferLink().split("/");
+        chunkDescriptor = fileTransferService.
+                resolve(segments[segments.length-1], Files.newInputStream(
+                        Paths.get("src/test/resources/samples/app1/icon.png")));
+        fileTransferService.writeChunk(chunkDescriptor);
+        releaseWrapper.setIconLink(transferLink.getDirectTransferLink() + "/icon.png");
+
+        List<String> screenshotPaths = Arrays.asList("src/test/resources/samples/app1/shot1.png",
+                "src/test/resources/samples/app1/shot2.png", "src/test/resources/samples/app1/shot3.png");
+        List<String> screenshotLinks = new ArrayList<>();
+        String []pathSegments;
+        for (String path: screenshotPaths) {
+            pathSegments = path.split("/");
+            String fullQualifiedName = pathSegments[pathSegments.length - 1];
+            String []nameSegments = fullQualifiedName.split("\\.(?=[^.]+$)");
+            metaEntry.setFileName(nameSegments[0]);
+            metaEntry.setExtension(nameSegments[1]);
+            metaEntry.setSize(41236);
+            transferLink = fileTransferService.generateUploadLink(metaEntry);
+            segments = transferLink.getRelativeTransferLink().split("/");
+            chunkDescriptor = fileTransferService.
+                    resolve(segments[segments.length-1], Files.newInputStream(Paths.get(path)));
+            fileTransferService.writeChunk(chunkDescriptor);
+            screenshotLinks.add(transferLink.getDirectTransferLink() + "/" + fullQualifiedName);
+        }
+        releaseWrapper.setScreenshotLinks(screenshotLinks);
+
+        metaEntry.setFileName("sample");
+        metaEntry.setExtension("apk");
+        metaEntry.setSize(6259412);
+        TransferLink apkTransferLink = fileTransferService.generateUploadLink(metaEntry);
+        segments = apkTransferLink.getRelativeTransferLink().split("/");
+        chunkDescriptor = fileTransferService.
+                resolve(segments[segments.length-1], Files.newInputStream(Paths.get("src/test/resources/samples/app1/sample.apk")));
+        fileTransferService.writeChunk(chunkDescriptor);
+        releaseWrapper.setArtifactLink(apkTransferLink.getDirectTransferLink() + "/sample.apk");
+        releaseWrapper.setRemoteStatus(false);
 
         entAppReleaseWrappers.add(releaseWrapper);
         applicationWrapper.setEntAppReleaseWrappers(entAppReleaseWrappers);

features/device-mgt/io.entgra.device.mgt.core.device.mgt.basics.feature/src/main/resources/conf/mdm-ui-config.xml

@@ -419,6 +419,7 @@
         <Scope>dm:admin:cea:update</Scope>
         <Scope>dm:admin:cea:delete</Scope>
         <Scope>dm:admin:cea:sync</Scope>
+        <Scope>am:pub:app:upload</Scope>
     </Scopes>
     <SSOConfiguration>
         <Issuer>device-mgt</Issuer>

pom.xml

@@ -2177,8 +2177,8 @@
         <json.smart.version>1.3</json.smart.version>
         <google.gson.version>2.8.5</google.gson.version>
         <google.guava.version>31.0.1-jre</google.guava.version>
-        <squareup.okhttp3.version>4.6.0</squareup.okhttp3.version>
+        <squareup.okhttp3.version>4.12.0</squareup.okhttp3.version>
-        <okio.version>1.13.0</okio.version>
+        <okio.version>3.6.0</okio.version>
         <github.openfeign.version>9.3.1</github.openfeign.version>
         <jsr311.version>1.1.1</jsr311.version>
         <commons.logging.version>1.2</commons.logging.version>