Power Apps – Express Design (Build an app in seconds) – Figma to app

figma to app

In continuation with our first series – Power Apps – Express Design (Build an app in seconds) – Image to app, let us see how Figma app works.

Figma is a vector graphics editor and prototyping tool which is primarily web-based, with additional offline features enabled by desktop applications for macOS and Windows. The Figma mobile app for Android and iOS allows viewing and interacting with Figma prototypes on real-time mobile devices.

Figma to App bridges that gap between design and development, with Figma to App designers and developers can collaborate together to build an optimal experience for the end-users.

As a designer, you will simply create your design using Figma and then you upload that Figma file to Power Apps which will be taking care of converting your design into a working app.

Without further ado, let’s jump into the action.

Design in Figma

1. Go to the www.figma.com and create an account, then on the left navigation menu click on Community and look for a template named NETFLIX (first prototype)

NETFLIX

2. Click on Duplicate to load in the Designer tool – this is the place for all the customizations


3. Copy the URL from the URL Bar (see red circle in step 2 image).


4. Create a Figma personal access token using the following steps

  • On the Figma home page, click settings
  • Look for Personal access tokens, add a token description and create a new one
  • An important point to note is to copy the token
Figma settings
Personal access tokens

5. Go to Power Apps and create a Figma (preview) app

Figma (preview) app

And voila, once more – Power Apps has provisioned from Figma in a few minutes

Netflix by Power Apps

This is a huge productivity (design) saver that will allow businesses to roll out user-friendly, great-looking apps to their users in a short amount of time and effort.


API to app

At the time of writing this blog, the App-from-API feature is to be released in early July 2022.

Coming soon…

Power Apps – Express Design (Build an app in seconds) – Image to app

turn images and designs into apps using AI-powered express design

The need for Digitization is constantly growing and there are never enough resources (Cost-Scope-Schedule) to fulfil all the requirements, therefore Microsoft on 25th May during the recent Microsoft Build event, has introduced the “Express Design – Build an app in seconds” which is a new Power Apps features that accelerate the process for getting started by taking existing content (e.g.: a picture of your paper form, a screenshot of a design, a PPT, a PDF or a Figma design file) and converting them in working Power App with UI and data without requiring the maker to learn how to build an app.

This magic is done using Azure Cognitive Vision OCR model to recognize the text from your image as well as the Azure Computer Vision Object Detection model to recognize the controls on the image whether it’s a text input, a label or radio button, etc.

Azure Cognitive Vision OCR & Azure Computer Vision Object Detection model

After that, even though it’s optional, however, it’s recommended for you to set up the data through dataverse, so you will have your data stored in dataverse.

We have got three different options and we are going to see each one of them

  • Image to app
  • Figma to app
  • API to app

Image to app

Image to app

Let’s get started by building an Image to app

1. On Power Apps, click Create and select Image (preview)

Image (preview)

2. The Upload an image screen appears, where either you upload an image of your own or start with some sample images – in our case, let us upload the following Car Details Application Wireframe

Upload an image

Car Details Wireframe

3. After Azure identifies the component, tag and assign each component as per the requirements

Assign components

4. Next the system allows you to create a new table in Dataverse (recommended), or simply skip it for now.


5. In this step, map the column as per the required data type, review then create.

Columns mapping

And voila, in a few minutes – Power Apps has provisioned the app as per the given input!!!

Car details application

This is a whole new world of possibilities for the citizen developers, those architects or building technicians who are looking for a genuine alternative to building an app – truly it is Empowering every person and every business on the planet to achieve more.


Now, we are going to see how Figma to app works.

Team Collaboration on PowerApps

Introduction

The much-awaited feature has finally come in Power Apps which allows a team to work simultaneously in one Power Apps application.

Forget now locked for editing message now – this sounds exciting, isn’t 😊

locked for editing

Together, we are going to create a sample app in Power Apps and enable the collaboration with Azure DevOps.

Without further ado, let’s get started with step-by-step instructions.

1. Create a Help Desk application

Let’s assume our organization is in need of a Help Desk application.

To make our life easier Microsoft has come with a plethora of templates ready to be provisioned, so let us build the application.

  • In Power Apps left navigation Menu, click on + Create
  • Locate Start from template, and look for Help Desk
  • Provide a meaningful name and click create
  • and voila, in less than a minute our app is ready to use
Help Desk

Now let’s say our Help Desk Admin needs to have a customized report for the respective technology stream in the organization – for example SAP Report, Microsoft Dynamics Report, etc – (please note that we will not be implementing any report in this blog, this would be out of scope).

To make it simpler, we will have 2 screens so each developer can work simultaneously on the same application.

Power Apps Developer Screen

2. Connect with Azure DevOps

2.1 What is DevOps?

It is a compound of development (Dev) and operations (Ops), DevOps is the union of people, processes and technology to continually provide value to customers.

2.2 What does DevOps mean for teams?

DevOps enables formerly siloed roles—development, IT operations, quality engineering and security—to coordinate and collaborate to produce better, more reliable products. By adopting a DevOps culture along with DevOps practices and tools, teams gain the ability to better respond to customer needs, increase confidence in the applications they build and achieve business goals faster.

2.3 The benefits of DevOps

Teams that adopt DevOps culture, practices and tools become high-performing, building better products faster for greater customer satisfaction. This improved collaboration and productivity are also integral to achieving business goals like these:

The benefits of DevOps

2.4 Login or Sign Up For A Free Azure DevOps Account

Login to dev.azure.com or sign up for a free account, we need it to setup a repository which we are going to see in the next steps.

Once logged in, create a New DevOps Project.

Create a New DevOps Project

Provide a Project Name.

Create a New DevOps Project

Click on Repos, then Initialize the repository.

Initialize the repository

2.5 Keep a note of the Azure DevOps Git Repository URL and Branch

It should be as follows:

[https://dev.azure.com/organization_name/project_name/_git/repo_name]

for our case, it would be:

[https://dev.azure.com/organization_name/Help%20Desk/_git/Help%20Desk]

the branch name would be:

[main]

2.6 Create a DevOps Project Personal Access Token

A personal access token (PAT) as an alternate password to authenticate into Azure DevOps, it contains your security credentials for Azure DevOps. A PAT identifies you, your accessible organizations, and scopes of access. As such, they’re as critical as passwords, so you should treat them the same way.

In the DevOps Project, under the User Settings (top-right corner), click on Personal access tokens

Personal access tokens

Create a new personal access token

Personal access tokens

Make sure you copy the token and keep it securely

Personal access tokens

3. Connect Azure DevOps Git with Power Apps

It is time now to connect our application with the repository:

3.1 Enable the Git version control setting

In Power Apps, Go to File > Settings > Upcoming features and enable the Git version control setting:

Git version control setting

Once connected, click on the Git version control then connect.

Enter the value previously taken from the above step 2.5

Git version control setting

3.2 Sign in to your DevOps repository

Sign in to your DevOps repository using your DevOps username and your Personal Access Token – see step 2.6

Sign in to your DevOps repository

It creates a Directory for you if not found.

It creates a Directory for you if not found.

4 Collaborate with your team

4.1 Share the Help Desk app with your developer

It is time now to share and collaborate, for that we need to first share the app as co-owner

Share the Help Desk app with your developer

4.2 Login simultaneously to the app

Important note 1: we recommend closing and re-opening the main browser as it may result in an unwanted experience.

Important note 2: The second developer must login using his Active Directory Username and for the password use the Personal Token Access – see step 2.6

Share the Help Desk app with your developer

and voila, the second developer sees the same application and its artifacts.

Login simultaneously to the app

5 Commit changes and check for Git updates

Let’s say that the second developer (right screen) has to work on a Jira Report, therefore he adds the screen

Login simultaneously to the app

As his work is completed, he needs to commit so other developers can see his changes – this is done using the Sync button.

Commit changes and check for Git updates

Once committed, the other developers use the same button to sync the application and here is how it looks:

Login simultaneously to the app


5. Summary

This is a powerful and much-needed feature to deploy applications more quickly and seamlessly.

Additionally, Azure DevOps provide improved collaboration and productivity which lead to building better products faster for greater customer satisfaction.

Furthermore, this process allows the team to have complete code control such as code review, editing the code itself in a different application such as Visual Studio Code Editor, etc

Lastly, if you find this article useful, please share it with your friends. Every little bit helps. Thank you!

MCT

In the year 2010 when I took MOSS 2007 Training conducted by an MCT who is now my friend – I admired him for being in such a high position – Microsoft Certified Trainers (MCTs) are the premier technical and instructional experts in Microsoft technologies.

I never in my life dreamed that one day I will become a Microsoft Certified Trainer which has provided me with immense satisfaction and I intend to honour that trust from Microsoft.

As an active MCT now, I will get exclusive benefits as an MCT including access to the complete library of official Microsoft training and certification products, substantial discounts on exams, books, and Microsoft products.

In addition, MCTs will be able to use Microsoft readiness resources to help enhance their training career and engage with other MCT members in an online community forum. They will also receive invitations to exclusive Microsoft and local MCT community events.

17th National Masters Championships

This is the first time that I participated in the 17th National Masters Championships 2021 at Mangalore. It was an honor to be a part of the Maharashtra team and I am grateful to be a part of this amazing journey with so many great swimmers from across India.

I would like to take this opportunity to thank the Swimming Federation of India, Tilak Tank Pune, my coaches (Kalpana ma’m, Dipti & Maggie) and of course my family!!!

Insh’Allah, see you again next year!

Restrict your Azure AD app to a set of users in an Azure AD tenant

This time we are going to see together how to restrict some specific users or set of users or groups in Azure AD tenant – this scenario is useful when you want to provide access to some specific department only in your organization e.g.: Finance Department.

It is important to note that Applications registered in an Azure Active Directory (Azure AD) tenant are, by default, available to all users of the tenant who authenticate successfully – therefore the following steps are necessary to update the application to require user assignment.

Update the app to require user assignment

To update an application to require user assignment, you must be owner of the application under Enterprise apps, or be assigned one of Global administratorApplication administrator or Cloud application administrator directory roles.

  1. Sign in to the Azure portal.
  2. If you have access to multiple tenants, use the Directory + subscription filter  in the top menu to select the tenant in which you want to register an application.
  3. Search for and select Azure Active Directory.
  4. Under Manage, select Enterprise Applications > All applications.
  5. Select the application you want to configure to require assignment. Use the filters at the top of the window to search for a specific application.
  6. On the application’s Overview page, under Manage, select Properties.
  7. Locate the setting User assignment required? and set it to Yes. When this option is set to Yes, users and services attempting to access the application or services must first be assigned for this application, or they won’t be able to sign-in or obtain an access token.
  8. Select Save.

Assign the app to users and groups

Once you’ve configured your app to enable user assignment, you can go ahead and assign the app to users and groups.

  1. Under Manage, select the Users and groups > Add user/group .
  2. Select the Users selector. A list of users and security groups will be shown along with a textbox to search and locate a certain user or group. This screen allows you to select multiple users and groups in one go.
  3. Once you are done selecting the users and groups, select Select.
  4. (Optional) If you have defined app roles in your application, you can use the Select role option to assign the app role to the selected users and groups.
  5. Select Assign to complete the assignments of the app to the users and groups.
  6. Confirm that the users and groups you added are showing up in the updated Users and groups list.

and bang!!! only the set of users which you specified are now able to access the app now.

Azure Authentication using OAuth in ASP.NET WebForms (Owin)

With all major deployment going to Azure WebApps – it is imperative for our organization to handle the Authentication from AAD perspective; so in order to use AAD Authentication, the approach is to use an App which serve as a “Bridge” between AAD & the solution which consume it.  Follow this link If you wanna know more on how to Register an app with the Azure Active Directory v2.0 endpoint

The requirement is based on a scenario where the user use the browser to access an ASP.NET website which authenticate the user automatically.

We need to use the following libraries:

LibraryDescription
Microsoft.Owin.Security.OpenIdConnectMiddleware that enables an application to use OpenIdConnect for authentication
Microsoft.Owin.Security.CookiesMiddleware that enables an application to maintain a user session by using cookies
Microsoft.Owin.Host.SystemWebMiddleware that enables OWIN-based applications to run on Internet Information Services (IIS) by using the ASP.NET request pipeline
Install-Package Microsoft.Owin.Security.OpenIdConnect
Install-Package Microsoft.Owin.Security.Cookies
Install-Package Microsoft.Owin.Host.SystemWeb

These libraries enable single sign-on (SSO) by using OpenID Connect through cookie-based authentication. After authentication is completed and the token representing the user is sent to your application, OWIN middleware creates a session cookie. The browser then uses this cookie on subsequent requests so that the user doesn’t have to retype the password, and no additional verification is needed.

Configure the authentication pipeline

The following steps are used to create an OWIN middleware Startup class to configure OpenID Connect authentication. This class is executed automatically when your IIS process starts. (If your project doesn’t have a Startup.cs file in the root folder:)

1. Add OWIN and Microsoft.IdentityModel references to Startup.cs:

using Microsoft.Owin;
using Owin;
using Microsoft.IdentityModel.Protocols.OpenIdConnect;
using Microsoft.IdentityModel.Tokens;
using Microsoft.Owin.Security;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.OpenIdConnect;
using Microsoft.Owin.Security.Notifications;

2. Replace Startup class with the following code:

public class Startup
{
    // The Client ID is used by the application to uniquely identify itself to Microsoft identity platform.
    string clientId = System.Configuration.ConfigurationManager.AppSettings["ClientId"];

    // RedirectUri is the URL where the user will be redirected to after they sign in.
    string redirectUri = System.Configuration.ConfigurationManager.AppSettings["RedirectUri"];

    // Tenant is the tenant ID (e.g. contoso.onmicrosoft.com, or 'common' for multi-tenant)
    static string tenant = System.Configuration.ConfigurationManager.AppSettings["Tenant"];

    // Authority is the URL for authority, composed of the Microsoft identity platform and the tenant name (e.g. https://login.microsoftonline.com/contoso.onmicrosoft.com/v2.0)
    string authority = String.Format(System.Globalization.CultureInfo.InvariantCulture, System.Configuration.ConfigurationManager.AppSettings["Authority"], tenant);

    /// <summary>
    /// Configure OWIN to use OpenIdConnect
    /// </summary>
    /// <param name="app"></param>
    public void Configuration(IAppBuilder app)
    {
        app.SetDefaultSignInAsAuthenticationType(CookieAuthenticationDefaults.AuthenticationType);

//"Katana bug #197" - https://stackoverflow.com/questions/49944071/idx21323-openidconnectprotocolvalidationcontext-nonce-was-null-openidconnectpro
app.UseKentorOwinCookieSaver();

        app.UseCookieAuthentication(new CookieAuthenticationOptions());
        app.UseOpenIdConnectAuthentication(
            new OpenIdConnectAuthenticationOptions
            {
                // Sets the ClientId, authority, RedirectUri as obtained from web.config
                ClientId = clientId,
                Authority = authority,
                RedirectUri = redirectUri,
                // PostLogoutRedirectUri is the page that users will be redirected to after sign-out. In this case, it is using the home page
                PostLogoutRedirectUri = redirectUri,
                Scope = OpenIdConnectScope.OpenIdProfile,
                // ResponseType is set to request the code id_token - which contains basic information about the signed-in user
                ResponseType = OpenIdConnectResponseType.CodeIdToken,
                // ValidateIssuer set to false to allow personal and work accounts from any organization to sign in to your application
                // To only allow users from a single organizations, set ValidateIssuer to true and 'tenant' setting in web.config to the tenant name
                // To allow users from only a list of specific organizations, set ValidateIssuer to true and use ValidIssuers parameter
                TokenValidationParameters = new TokenValidationParameters()
                {
                    ValidateIssuer = false // This is a simplification
                },
                // OpenIdConnectAuthenticationNotifications configures OWIN to send notification of failed authentications to OnAuthenticationFailed method
                Notifications = new OpenIdConnectAuthenticationNotifications
                {
                    AuthenticationFailed = OnAuthenticationFailed
                }
            }
        );
    }

    /// <summary>
    /// Handle failed authentication requests by redirecting the user to the home page with an error in the query string
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    private Task OnAuthenticationFailed(AuthenticationFailedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> context)
    {
        context.HandleResponse();
        context.Response.Redirect("/?errormessage=" + context.Exception.Message);
        return Task.FromResult(0);
    }
}

3. Handle sign-in and sign-out requests:

In your Start Page where you want to handle authentication, add the following two methods to handle sign-in and sign-out to your controller by initiating an authentication challenge:

/// <summary>
/// Send an OpenID Connect sign-in request.
/// Alternatively, you can just decorate the SignIn method with the [Authorize] attribute
/// </summary>
public void SignIn()
{
    if (!Request.IsAuthenticated)
    {
        HttpContext.GetOwinContext().Authentication.Challenge(
            new AuthenticationProperties{ RedirectUri = "/" },
            OpenIdConnectAuthenticationDefaults.AuthenticationType);
    }
}

/// <summary>
/// Send an OpenID Connect sign-out request.
/// </summary>
public void SignOut()
{
    HttpContext.GetOwinContext().Authentication.SignOut(
            OpenIdConnectAuthenticationDefaults.AuthenticationType,
            CookieAuthenticationDefaults.AuthenticationType);
}

protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.IsAuthenticated)
            {
                Session["UserName"] = System.Security.Claims.ClaimsPrincipal.Current.FindFirst("name").Value;
                Session["UserUPN"] = System.Security.Claims.ClaimsPrincipal.Current.FindFirst("preferred_username").Value;
                Session["UserEmail"] = System.Security.Claims.ClaimsPrincipal.Current.FindFirst("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress").Value;
            }
            else
                SignIn();
        }

Et voila! It is very easy to set up and use and it works like a charm.

I hope you enjoyed reading and using it!

Convert Microsoft Office Documents into PDF using Microsoft Graph & Azure Functions

One of my recent task was to translate a word document into a pdf from a web application hosted in Azure Web App – therefore the code has to process at the Azure side.

Initially, I thought a traditional approach would work such as Interop or some free Api easily available on the net, however to my great surprise the code was throwing the following exception A generic error occurred in GDI+.

Exception handling in Net: Advanced exceptions | Hexacta

What I learned from this is that all Azure Web Apps (as well as Mobile App/Services, WebJobs, and Functions) run in a secure environment called a sandbox. Each app runs inside its own sandbox, isolating its execution from other instances on the same machine as well as providing an additional degree of security and privacy that would otherwise not be available. The sandbox mechanism aims to ensure that each app running on a machine will have a minimum guaranteed level of service; furthermore, the runtime limits enforced by the sandbox protect apps from being adversely affected by other resource-intensive apps which may be running on the same machine.

The sandbox generally aims to restrict access to shared components of Windows. Unfortunately, many core components of Windows have been designed as shared components: the registry, cryptography, and graphics subsystems, among others. For the sake of radical attack surface area reduction, the sandbox prevents almost all of the Win32k.sys APIs from being called, which practically means that most of User32/GDI32 system calls are blocked. For most applications, this is not an issue since most Azure Web Apps do not require access to Windows UI functionality (they are web applications after all). Since all the major libraries use a lot of GDI calls during the PDF conversion, the default rendering engine does not work on Azure Web Apps. You can find more information about those sandbox restrictions on https://github.com/projectkudu/kudu/wiki/Azure-Web-App-sandbox#win32ksys-user32gdi32-restrictions.

So now the solution is to find an approach to convert the PDF within Azure – luckily I came across a blog from Philipp Bauknecht which is leveraging Microsoft Graph to convert a document to PDF – let us see how.

There are several steps, which you have to perform in the correct order:

  1. Create an App registration in Azure AD and assign the required permissions
  2. Create a new Azure Functions app using Visual Studio 2019
  3. Create an OAuth2 authentication service to request an access token to call the Microsoft Graph
  4. Create a File Service to upload, convert and delete files using the Microsoft Graph
  5. Setup Dependency Injection
  6. Create a new function as the Main entry point
  7. Create a Function App in Azure to host the code and make it available globally
  8. Import the publish profile & deploy using Visual Studio 2019
  9. Test using a Console Application c#
  10. Test using Postman

Step 1: Create an App registration in Azure AD and assign the required permissions

1.1 Go to https://portal.azure.com, then Azure Active Directory and select App Registrations; Click on New registration, provide a name then click on Register

1.2 Once the app is provisioned, on the left navigation blade click on Certificates & secrets; Click on New client secret to create one, then save the value of the secret for later use.

1.3 Go to API permissions, then click on Add a permission then Microsoft Graph, then choose Application permissions to add the following permissions (Admin consent is a must):

1.4 Go to Overview and save the values of Application (client) Id and Directory (tenant) Id for later use.

Step 2: Create a new Azure Functions app using Visual Studio 2019

Open Visual Studio 2019 and Create a new project in which choose Azure Functions

Step 3: Create an OAuth2 authentication service to request an access token to call the Microsoft Graph

This class is responsible to get the access token.

using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using System.Collections.Generic;
using System.Net.Http;
using System.Threading.Tasks;

namespace PdfConversionFunctionApp
{
    public class AuthenticationService
    {
        public static async Task<string> GetAccessTokenAsync(ApiConfig _apiConfig)
        {
            var values = new List<KeyValuePair<string, string>>
            {
                new KeyValuePair<string, string>("client_id", _apiConfig.ClientId),
                new KeyValuePair<string, string>("client_secret", _apiConfig.ClientSecret),
                new KeyValuePair<string, string>("scope", _apiConfig.Scope),
                new KeyValuePair<string, string>("grant_type", _apiConfig.GrantType),
                new KeyValuePair<string, string>("resource", _apiConfig.Resource)
            };
            var client = new HttpClient();
            var requestUrl = $"{_apiConfig.Endpoint}{_apiConfig.TenantId}/oauth2/token";
            var requestContent = new FormUrlEncodedContent(values);
            var response = await client.PostAsync(requestUrl, requestContent);
            var responseBody = await response.Content.ReadAsStringAsync();
            dynamic tokenResponse = JsonConvert.DeserializeObject(responseBody);
            return tokenResponse?.access_token;
        }
    }
}

Step 4: Create a File Service to upload, convert and delete files using the Microsoft Graph

This class is responsible to upload, convert and delete the file.

using Newtonsoft.Json;
using System;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

namespace PdfConversionFunctionApp
{
    public class FileService
    {
        private readonly ApiConfig _apiConfig;
        private HttpClient _httpClient;

        public FileService(ApiConfig apiConfig)
        {
            _apiConfig = apiConfig;
        }

        private async Task<HttpClient> CreateAuthorizedHttpClient()
        {
            if (_httpClient != null)
            {
                return _httpClient;
            }

            var token = await AuthenticationService.GetAccessTokenAsync(_apiConfig); 
            _httpClient = new HttpClient();
            _httpClient.DefaultRequestHeaders.Add("Authorization", $"Bearer {token}");

            return _httpClient;
        }

        public async Task<string> UploadStreamAsync(string path, Stream content, string contentType)
        {
            var httpClient = await CreateAuthorizedHttpClient();

            string tmpFileName = $"{Guid.NewGuid().ToString()}{MimeTypes.MimeTypeMap.GetExtension(contentType)}";
            string requestUrl = $"{path}root:/{tmpFileName}:/content";
            var requestContent = new StreamContent(content);
            requestContent.Headers.ContentType = new MediaTypeHeaderValue(contentType);
            var response = await httpClient.PutAsync(requestUrl, requestContent);
            if (response.IsSuccessStatusCode)
            {
                dynamic file = JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());
                return file?.id;
            }
            else
            {
                var message = await response.Content.ReadAsStringAsync();
                throw new Exception($"Upload file failed with status {response.StatusCode} and message {message}");
            }
        }

        public async Task<byte[]> DownloadConvertedFileAsync(string path, string fileId, string targetFormat)
        {
            var httpClient = await CreateAuthorizedHttpClient();

            var requestUrl = $"{path}{fileId}/content?format={targetFormat}";
            var response = await httpClient.GetAsync(requestUrl);
            if (response.IsSuccessStatusCode)
            {
                var fileContent = await response.Content.ReadAsByteArrayAsync();
                return fileContent;
            }
            else
            {
                var message = await response.Content.ReadAsStringAsync();
                throw new Exception($"Download of converted file failed with status {response.StatusCode} and message {message}");
            }
        }

        public async Task DeleteFileAsync(string path, string fileId)
        {
            var httpClient = await CreateAuthorizedHttpClient();

            var requestUrl = $"{path}{fileId}";
            var response = await httpClient.DeleteAsync(requestUrl);
            if (!response.IsSuccessStatusCode)
            {
                var message = await response.Content.ReadAsStringAsync();
                throw new Exception($"Delete file failed with status {response.StatusCode} and message {message}");
            }
        }
    }
}

Step 5: Setup Dependency Injection

5.1 In order to use the FileService and the Configuration properties (local & in Azure), we need to set dependency injection. To use dependency injection in Azure Function app we need to add the package Microsoft.Azure.Functions.Extensions to our app using Nuget.

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.IO;
using System.Reflection;

[assembly: FunctionsStartup(typeof(PdfConversionFunctionApp.Startup))]
namespace PdfConversionFunctionApp
{
    class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            var fileInfo = new FileInfo(Assembly.GetExecutingAssembly().Location);
            string path = fileInfo.Directory.Parent.FullName;
            var config = new ConfigurationBuilder()
                .SetBasePath(Environment.CurrentDirectory)
                .SetBasePath(path)
                .AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
                .AddEnvironmentVariables()
                .Build();

            var apiConfig = new ApiConfig();
            config.Bind(nameof(ApiConfig), apiConfig);

            builder.Services.AddSingleton<FileService>();
            builder.Services.AddSingleton(apiConfig);
        }
    }
}

The above code – from line 15 to 25 – takes care of getting the configuration values, if the app runs locally then it loads the local.settings.json, otherwise, it takes the values from the Azure Function Application settings (see Step 7.2)

5.2 Now set the values of TenantId, ClientId & ClientSecret from Step 1; The SiteId correspond to the Document Library where the file will get temporarily uploaded, we will have to GET it using Microsoft Graph Explorer with the following formula:

This is how the local.settings.json looks:

https://graph.microsoft.com/v1.0/sites/{hostname}:/sites/{path}?$select=id
GET => https://graph.microsoft.com/v1.0/sites/myorganization.sharepoint.com?$select=id
GET => https://graph.microsoft.com/v1.0/sites/myorganization.sharepoint.com:/sites/Contoso/Operations/Manufacturing?$select=id
Response => 
{
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#sites(id)/$entity",
    "id": "myorganization.sharepoint.com,74796aa9-17f6-4c09-9b20-1d78bfdcbac4,98f692fe-ea45-423b-8001-0b9c6bb2b50f"
}
What you get back in the id is in this format: {hostname},{spsite.id},{spweb.id}. 
What we need is then the {spsite.id} which is 74796aa9-17f6-4c09-9b20-1d78bfdcbac4
{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "graph:Endpoint": "https://login.microsoftonline.com/",
    "graph:GrantType": "client_credentials",
    "graph:Scope": "Files.ReadWrite.All",
    "graph:Resource": "https://graph.microsoft.com",
    "graph:TenantId": "",
    "graph:ClientId": "",
    "graph:ClientSecret": "",
    "pdf:GraphEndpoint": "https://graph.microsoft.com/v1.0/",
    "pdf:SiteId": ""
  },
  "ApiConfig": {
    "Endpoint": "https://login.microsoftonline.com/",
    "GrantType": "client_credentials",
    "Scope": "Files.ReadWrite.All",
    "Resource": "https://graph.microsoft.com",
    "TenantId": "",
    "ClientId": "",
    "ClientSecret": "",
    "GraphEndpoint": "https://graph.microsoft.com/v1.0/",
    "SiteId": ""
  }
}

Step 6: Create a new function as the Main entry point

Add a new function to your project and name it ConvertToPdf. Select the Http trigger so our function can be called via a http request and pick Authorization level Anonymous so we don’t need to provide any credentials when calling this function; Replace the below code

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Extensions.Logging;
using System.Threading.Tasks;

namespace PdfConversionFunctionApp
{
    public class ConvertToPdf
    {
        private readonly FileService _fileService;
        private readonly ApiConfig _apiConfig;

        public ConvertToPdf(FileService fileService, ApiConfig apiConfig)
        {
            _fileService = fileService;
            _apiConfig = apiConfig;
        }

        [FunctionName("ConvertToPdf")]
        public async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequest req, ILogger log)
        {
            if (req.Headers.ContentLength == 0)
            {
                log.LogInformation("Please provide a file.");
                return new BadRequestObjectResult("Please provide a file.");
            }

            var path = $"{_apiConfig.GraphEndpoint}sites/{_apiConfig.SiteId}/drive/items/";

            var fileId = await _fileService.UploadStreamAsync(path, req.Body, req.ContentType);

            var pdf = await _fileService.DownloadConvertedFileAsync(path, fileId, "pdf");

            await _fileService.DeleteFileAsync(path, fileId);

            return new FileContentResult(pdf, "application/pdf");
        }
    }
}

Step 7: Create a Function App in Azure to host the code and make it available globally

7.1 Go to https://portal.azure.com, then click on Create Function App

7.2 Once the app is provisioned, on the left navigation blade click on Configuration, then New application setting – we will have to add the below application settings which are needed when the app runs from Azure (the values as the same as step 5.2)

7.3 On the Overview section, download the publish profile while clicking on Get publish profile

Step 8: Import the publish profile & deploy using Visual Studio 2019

8.1 Right-click on Visual Studio, then choose Publish, import your publish settings to deploy your app from the file downloaded in the previous step – then deploy.

8.2 If Debugging is needed then we can use the Azure Function App Log Stream Monitoring features.

Step 9: Test using a Console Application c#

9.1 Create a console application and replace the following code.

using System;
using System.IO;
using System.Net;
using PdfConversionFunctionApp;

namespace PdfConversionConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            string filePathWord = @"C:\Temp\TestDocument.docx";
            string filePathOutWord = @"C:\Temp\TestDocument.pdf";

            string filePathExcel = @"C:\Temp\TestExcel.xlsx";
            string filePathOutExcel = @"C:\Temp\TestExcel.pdf";

            bool IsSuccessWord = ConverToPdf(filePathWord, filePathOutWord);
            bool IsSuccessExcel = ConverToPdf(filePathExcel, filePathOutExcel);
        }

        private static bool ConverToPdf(String filePath, String filePathOut)
        {
            try
            {
                //string urlLocal = "http://localhost:7071/api/ConvertToPdf";
                string urlAzure = "https://graphpdfconverter.azurewebsites.net/api/ConvertToPdf";

                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(urlAzure);
                req.Method = "POST";

                string fileExtension = Path.GetExtension(filePath);
                switch (fileExtension)
                {
                    case ".doc":
                        req.ContentType = "application/msword";
                        break;
                    case ".docx":
                        req.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
                        break;
                    case ".xls":
                        req.ContentType = "application/vnd.ms-excel";
                        break;
                    case ".xlsx":
                        req.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; ;
                        break;
                    default:
                        throw new Exception("Only Word & Excel documents are supported by the Converter");
                }

                Stream fileStream = System.IO.File.Open(filePath, FileMode.Open);
                MemoryStream inputStream = new MemoryStream();
                fileStream.CopyTo(inputStream);
                fileStream.Dispose();
                Stream stream = req.GetRequestStream();
                stream.Write(inputStream.ToArray(), 0, inputStream.ToArray().Length);
                HttpWebResponse res = (HttpWebResponse)req.GetResponse();

                //Create file stream to save the output PDF file
                FileStream outStream = System.IO.File.Create(filePathOut);
                //Copy the responce stream into file stream
                res.GetResponseStream().CopyTo(outStream);
                //Dispose the input stream
                inputStream.Dispose();
                //Dispose the file stream
                outStream.Dispose();

                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            return false;


        }
    }
}

9.2 To test and debug locally, Click F5 on the Function App – Visual Studio will provide a POST URL which you can use in the console to run & debug the code.

9.3 To run it from Azure, go to Azure Portal, then open your Azure Function App, on the left navigation blade click on Functions, click on the function name then Get Function Url. Use this URL in the console to convert the document to pdf.

It is important to mention that the Content Type will define the type of docunent to be converted – find the complete list of Common MIME types.

Step 10: Test using Postman

10.1 In Postman, add the Azure Function App Url (see step 9.3).

10.2 On the Header section, add the appropriate MIME Types

10.3 On the Body section, click on Binary and upload a file then click the Send button.

10.4 On successfull request, we can save the converted pdf file.

Summary

As we can see Microsoft Graph allows us to convert easily documents to pdf, that up to 1 million free calls, along with Azure Function it provides the flexibility to use these features anywhere anytime your users want.

Download the code from Github

Vaccine for all!

How it all started

Getting the vaccine is not an easy task – either you go to a vaccination center early to get a token or if lucky try to get an available slot in the Cowin site/Aarogya Setu mobile app – this has been the same experience got by friends, relatives, and colleagues across the country.

Therefore using the Co-WIN Public APIs, I decided to provide this web application to help all my fellow citizens to get vaccinated!

Let’s get vaccinated!

This web application looks for the vaccine slot availability in your respective District by selecting the age & available dose criteria – using the Co-WIN Public APIs, for more details about the API, click here

Please note that this web application does NOT book any slot on your behalf whatsoever – it only provides valuable information to help the citizen to select the available center at that point in time.

How it works

The program run in an interval to query the provided Co-WIN Public APIs to look for an available center in your respective District, taking into consideration the age and available dose. 

Once the program finds an available center, an email will be sent at the registered email address a complete report with all details which shows all the available centers along with the available dose at that point in time. 

It is important to mention that upon receiving the report, it is highly recommended to book the slots on the cowin.gov.in website or using the Aarogya Setu mobile app.

http://vaccineforall.co.in/About.aspx

Coronavirus Vaccine: When should you get vaccinated after recovering from  COVID-19?

Login failed for user ”. at System.Data.SqlClient.SqlInternalConnectionTds..ctor

Azure SQL

While connecting to the Azure SQL Database – I was getting the below error which took me hour to find out the root cause.

Login failed for user ”. at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager)

Initially I thought it is related to the password which is sent without the SecureString however it was still not working.

Luckily after hour of research, found creating a new user with [db_owner] permission will do the work – thanks to this blog.

here are the command to run to create the SQL new user and set the required permissions:

  1. Connect with SSMS to the master database
  2. CREATE LOGIN username WITH password=’password’;
  3. Switch to the application database
  4. CREATE USER username FROM LOGIN username;
  5. EXEC sp_addrolemember N’db_owner’, N’username’
  6. Updating the connection string in the Azure portal
Create a read-only user in Azure SQL – Vincent – Technologist