Azure Storage UseDevelopmentStorage=true when using KeyVault - azure

Question

I have configured my API to get the Azure Storage connection string from Azure KeyVault using Managed Identity.
Now the problem is that when I run the code locally in Visual Studio, it no longer uses the connection string from the appsettings.development.json which was "StorageAccount": "UseDevelopmentStorage=true"
Therefore I can't use the emulator when running locally.
I have created the following condition in my controller to work around this issue :
public FileController(IConfiguration configuration, IWebHostEnvironment env)
{
this.configuration = configuration;
if (env.IsDevelopment())
{
conn = this.configuration.GetConnectionString("StorageAccount");
}
else
{
conn = this.configuration["StorageConnectionString"];
}
}
Is this the proper way to do it ?

Answer 1

In local, if your ASPNETCORE_ENVIRONMENT set to Development, then it will read you local storage account like UseDevelopmentStorage=true.
When you publish to azure, it will use your webapp's MSI to get the connectionstring from key vault.
For more details, you could refer to the following code:
private IConfiguration _configuration;
private IWebHostEnvironment _env;
public WeatherForecastController(IConfiguration configuration, IWebHostEnvironment env)
{
_configuration = configuration;
_env = env;
}
if (_env.IsDevelopment())
{
con = _configuration.GetSection("StorageAccount").Value;
}
else
{
AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
var keyVaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(azureServiceTokenProvider.KeyVaultTokenCallback));
con = keyVaultClient.GetSecretAsync("https://xxxx.vault.azure.net/secrets/xxxx").GetAwaiter().GetResult().Value;
}