A sample ASP.NET Core 5.0 Blazor Server app to accompany Secretless apps with .NET and Azure Key Vault.

• Yahoo Finance API key from RapidAPI
• .NET SDK 5.0 or later
• Azure subscription

Before running the project on your machine, store the API key using one of the following approaches:

• If using Visual Studio, right-click the BlazorServerConfiguration project in Solution Explorer and select Manage User Secrets. Add the following snippet to the secrets.json file, replacing <API_KEY> with your API key. Save the file.

   {
   	"StockOptions": {
   	"ApiKey": "<API_KEY>"
   	}
   }

• If not using Visual Studio, replace <API_KEY> in the following command with your API key. Run the command from the directory containing the BlazorServerConfiguration.csproj file.

   dotnet user-secrets set "StockOptions:ApiKey" "<API_KEY>"

To run the project in Azure, complete the following steps:

1. Deploy the app to Azure App Service.

2. Provision an Azure SignalR Service instance with a Service Mode of Default.

3. Provision an Azure Key Vault instance.

4. In the Key Vault instance, navigate to Settings > Secrets. Create the following secrets by selecting Generate/Import.

   Name	Value
   Azure--SignalR--ConnectionString	The primary or secondary SignalR Service connection string found at Settings > Keys. For example, Endpoint=https://blazorserverconfigsignalr.service.signalr.net;AccessKey=<ACCESS_KEY>;Version=1.0;.
   StockOptions--ApiKey	The API key obtained from RapidAPI.

5. Apply the following changes in App Service:

   1. In Settings > Identity, enable a System-assigned managed identity via the Status toggle button.
   2. In Settings > Configuration > General settings:
      1. In the Stack settings section:
         1. Select .NET from the Stack drop-down list.
         2. Select .NET 5 from the .NET version drop-down list.
      2. In the Platform settings section, select On for the Web sockets and ARR affinity radio buttons.
   3. In Settings > Configuration > Application settings, select New application setting. Create a new environment variable named KEYVAULT_ENDPOINT whose value is the Key Vault resource's URI (e.g., https://blazorserverconfigvault.vault.azure.net/).

• Safe storage of app secrets in development in ASP.NET Core
• Azure Key Vault's official docs
• Azure Key Vault configuration provider in ASP.NET Core
• Tutorial: Use a managed identity to connect Key Vault to an Azure web app in .NET