Currently, there is no easy solution and feature or trick or tutorial how to write files on internal storage and that is very tedious work to save find on the given provided folder and  app directory with expo without detaching

I want to save files on internal storage like Downloads, WhatsApp, DCIM, Pictures

This feature useful for the app with download files/picture/music feature. 

In this working tutorial, we are going to download video files from the server and the same file will be moved to the desire device folder.

Here are steps that you need to do,  This is working code in ANDROID and that should work on iOs as well.

You need to install following expo packages expo-media-library, expo-permissions and expo-file-system

• Permissions.CAMERA_ROLL Permission is required, that should be fine.
• Using FileSystem to download video, it will provide local URI from device
• After call saveFile method to move the file to the desired folder.

import * as MediaLibrary from 'expo-media-library';

import * as Permissions from 'expo-permissions';

 import * as FileSystem from 'expo-file-system';

const saveFile = async (fileUri) => {

  const { status } = await Permissions.askAsync(Permissions.CAMERA_ROLL);

  if (status === 'granted') {

    const asset = await MediaLibrary.createAssetAsync(fileUri);

    await MediaLibrary.createAlbumAsync('<FOLDER NAME>', asset, false);

  }

};

 const fileDownLoad = async () => {

    let lastIndex = media?.uri.lastIndexOf('/');

    let fileName = media?.uri.substring(lastIndex);

    let downloadResumable = FileSystem.createDownloadResumable(

      "http://d23dyxeqlo5psv.cloudfront.net/big_buck_bunny.mp4",

      FileSystem.documentDirectory + fileName,

      {},

      () => {

        // down progress monitor here

      }

    );

    try {

      const { uri } = await downloadResumable.downloadAsync().then((item) => {

        return item;

      });

      await saveFile(uri)

        .then((rs) => {

          alert('Video saved to download folder);

        });

    } catch (e) {

      console.error(e);

    }

  };

Deno is a new runtime for JavaScript and TypeScript, invented by Ryan Dahl - the original author/creator of Node.js. The persistence of this project to fix design problems in Node.js described in Dahl's famous talk "10 Things I Regret About Node.js".  Here I am providing depth differences between Node.js and Deno. 

Visit 4cb.online and for hands-on with Hello-world Deno App

Azure SQL Database connection from App Service using a managed identity

Prerequisites:

Azure Database Setup

Let's create a database for you according to give screenshot

Setup Azure Active Directory

Open you newly create azure SQL server and add your email id(that you have used to login to azure portal)

Open Azure Database(for example: emp) and click on Query Editor(Preview) on and log-in with the option “Active Directory authentication” and run following command

Grant Access to your Web App to Azure SQL Database

This step is not required for the local running the app in visual studio

CREATE USER [<identity-name>] FROM EXTERNAL PROVIDER;

ALTER ROLE db_datareader ADD MEMBER [<identity-name>];

ALTER ROLE db_datawriter ADD MEMBER [<identity-name>];

ALTER ROLE db_ddladmin ADD MEMBER [<identity-name>];

GO

[<identity-name>] : Your web app Identity that will be required only when your code hosted over underlying web app to make the connection between an azure web app and your emp database.

  <configSections>

    <section name="SqlAuthenticationProviders" type="System.Data.SqlClient.SqlAuthenticationProviderConfigurationSection, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

  </configSections>

  <SqlAuthenticationProviders>

    <providers>

      <add name="Active Directory Interactive" type="Microsoft.Azure.Services.AppAuthentication.SqlAppAuthenticationProvider, Microsoft.Azure.Services.AppAuthentication" />

    </providers>

  </SqlAuthenticationProviders>

  <connectionStrings>

    <add name="BasicDatabaseConnectionString" connectionString="server=msidemoserver.database.windows.net;database=emp;UID=ManagedIdentity;Authentication=Active Directory Interactive" />

  </connectionStrings>

Note: update the connection string  with your Azure SQL server name and database

Sample web.config file: 

You're now ready to develop and debug your app with the SQL Database as the back end, using Azure AD authentication.

Let's run from your local machine and if your running given sample code(Download Sample Code from Git Hub) so you will see the following screen:

Please provide your comment and feedback, that'll be highly appreciated.

Azure Key Vault  With .Net Framework 4.8

Azure Key Vault Config Builder

Configuration Details

• Above highlighted key vault name you need to replace with yours once.

Managed Identity setup for your web app:

Asp.net MVC 5 Code and Neuget Packages Details

A result from the local machine 

Let's have demo app running over the azure

Azure Front Door

• AFD built on world-class Microsoft Global Network infrastructure. Always keep your traffic on the best path to your app, improve your service scale, reduce latency and increase throughput for your global users with edge load balancing and application acceleration.
• SSL offload and application acceleration at the edge close to end-users
• Global HTTP load balancing with instant failover
• Actionable insights about your users and back ends
• Web Application Firewall (WAF) and DDoS Protection
• The central control plane for traffic orchestration

Most Popular AFD Features:

Credit: https://azure.microsoft.com/

Azure Traffic Manager 

• Increase application availability
• Improve application performance
• Perform service maintenance without downtime
• Combine hybrid applications
• Distribute traffic for complex deployments 

Traffic-routing method

• Priority: Best to use when you need to use a primary service endpoint for all traffic, and provide backups in case the primary or the backup endpoints are unavailable.
• Weighted: Best to use when you need to distribute traffic across a set of endpoints, either evenly or according to weights, which you define.
• Performance: Best to use when you need to have endpoints in different geographic locations and you want end users to use the "closest" endpoint in terms of the lowest network latency.
• Geographic:  user's shall be directed to specific endpoints (Azure, External, or Nested) based on which geographic location their DNS query originates from. Examples include complying with data sovereignty mandates, localization of content & user experience and measuring traffic from different regions.
• Multivalue: Select MultiValue for Traffic Manager profiles that can only have IPv4/IPv6 addresses as endpoints. When a query is received for this profile, all healthy endpoints are returned.
• Subnet: Select Subnet traffic-routing method to map sets of end-user IP address ranges to a specific endpoint within a Traffic Manager profile. When a request is received, the endpoint returned will be the one mapped for that request’s source IP address.

Credit: https://docs.microsoft.com

Azure Active Directory- Restrict Application Access To Users or A Group

Azure Ad Group

Create an Azure Ad Group (Security):

1. Log in to the Azure portal with an administrator account if you are not admin then take help from your concern admin team. (mostly normal user can not create the group)
2. Click on the All services item on the main menu or Find Azure Active Directory in the left panel.
3. Choose the directory you are using for the application.
4. Choose Groups >> New Group
5. Choose the Group Type to Security
6. Provide a meaning full group name
7. Add users under the member's sections that you are going to allow to access your application
8. Click on Create button 

How to Configure the Application?

Follow the following steps to configure your app:

1. Log in to the Azure portal with your account(an administrator account will be required but you can take help from your Cloud Admin/DevOps Team) or as an owner of the app under Enterprise apps.
2. Click on the All services item on the main menu or Find Azure Active Directory in the left panel.
3. Choose the directory you are using for the application.
4. Click on the Enterprise applications tab.
5. Select your application from the list of applications associated with this directory.
6. Click the Properties tab.
7. Change the User assignment required? toggle to Yes.
8. Click the Save button at the top of the screen.

Assign Group to App

1. To assign group(s) to an application directly, follow the steps below:
2. Open the Azure portal and sign in as a Global Administrator or as a non-admin application owner with an Azure AD Premium license assigned is required
3. Select  “Azure Active Directory”  in Left Panel to open.
4. Click Enterprise Applications from the Azure Active Directory left-hand navigation menu.
5. Click All Applications to view a list of all your applications and filter  with your app name
6. Select the application you want to assign a user to from the list.
7. Click Users and Groups from the application’s left-hand navigation menu.
8. Click the Add button on top of the Users and Groups list to open(filter your group name) the Add Assignment pane.
9. Click the Users and groups selector from the Add Assignment pane.

Grant tenant-wide admin consent to an application :

Admin consent will be required because the application will be reading the user profile on behalf of the user. Only Global admin can grant the admin consent.
Visit MSDN for more information around the Admin consent.