infrastructure DI

dotnet/AipsCore/Infrastructure/DI/Configuration/ConfigurationEnvExtensions.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.Configuration;
+
+namespace AipsCore.Infrastructure.DI.Configuration;
+
+public static class ConfigurationEnvExtensions
+{
+    private const string DbConnStringKey = "DB_CONN_STRING";
+
+    public static string GetEnvConnectionString(this IConfiguration configuration)
+    {
+        return configuration.GetEnvForSure(DbConnStringKey);
+    }
+
+    private static string GetEnvForSure(this IConfiguration configuration, string key)
+    {
+        var value = configuration[key];
+
+        if (value is null)
+        {
+            throw new ConfigurationException(key);
+        }
+        
+        return value;
+    }
+}