Extract shared configuration helpers into Infrastructure.Configuration library (#248)

2026-10-14 17:54:42 +00:00 · 2026-08-25 14:16:57 -04:00
parent 8a047e8d9f
commit 2b82d1918b
22 changed files with 161 additions and 64 deletions
--- a/web/backend/API/API.Core/API.Core.csproj
+++ b/web/backend/API/API.Core/API.Core.csproj
@@ -18,6 +18,7 @@
        <ProjectReference Include="..\..\Domain\Domain.Entities\Domain.Entities.csproj" />
        <ProjectReference Include="..\..\Domain\Domain.Exceptions\Domain.Exceptions.csproj" />
        <ProjectReference Include="..\..\Database\Database.Connection\Database.Connection.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Jwt\Infrastructure.Jwt.csproj" />
        <ProjectReference Include="..\..\Features\Features.Breweries\Features.Breweries.csproj" />
        <ProjectReference Include="..\..\Features\Features.UserManagement\Features.UserManagement.csproj" />
--- a/web/backend/API/API.Core/Authentication/JwtAuthenticationHandler.cs
+++ b/web/backend/API/API.Core/Authentication/JwtAuthenticationHandler.cs
@@ -1,5 +1,6 @@
 using System.Security.Claims;
 using System.Text.Encodings.Web;
+using Infrastructure.Configuration;
 using Infrastructure.Jwt;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.Extensions.Options;
@@ -32,9 +33,9 @@ public class JwtAuthenticationHandler(
    protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
    {
        // Use the same access-token secret source as TokenService to avoid mismatched validation.
-        string? secret = configuration["ACCESS_TOKEN_SECRET"];
+        string? secret = configuration[ConfigurationKeys.AccessTokenSecret];
        if (string.IsNullOrWhiteSpace(secret))
-            secret = configuration["Jwt:SecretKey"];
+            secret = configuration[ConfigurationKeys.JwtSecretKeyFallback];

        if (string.IsNullOrWhiteSpace(secret))
            return AuthenticateResult.Fail("JWT secret is not configured");
--- a/web/backend/API/API.Specs/API.Specs.csproj
+++ b/web/backend/API/API.Specs/API.Specs.csproj
@@ -38,6 +38,7 @@

    <ItemGroup>
        <ProjectReference Include="..\API.Core\API.Core.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Email\Infrastructure.Email.csproj" />
        <ProjectReference Include="..\..\Features\Features.Emails\Features.Emails.csproj" />
    </ItemGroup>
--- a/web/backend/API/API.Specs/Steps/AuthSteps.cs
+++ b/web/backend/API/API.Specs/Steps/AuthSteps.cs
@@ -1,6 +1,7 @@
 using System.Text;
 using System.Text.Json;
 using FluentAssertions;
+using Infrastructure.Configuration;
 using Infrastructure.Jwt;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -430,7 +431,7 @@ public class AuthSteps(ScenarioContext scenario)
            ? user
            : throw new InvalidOperationException("registered username not found in scenario");

-        string secret = GetRequiredConfigValue("ACCESS_TOKEN_SECRET");
+        string secret = GetRequiredConfigValue(ConfigurationKeys.AccessTokenSecret);
        scenario["accessToken"] = GenerateJwtToken(
            userId,
            username,
@@ -449,7 +450,7 @@ public class AuthSteps(ScenarioContext scenario)
            ? user
            : throw new InvalidOperationException("registered username not found in scenario");

-        string secret = GetRequiredConfigValue("CONFIRMATION_TOKEN_SECRET");
+        string secret = GetRequiredConfigValue(ConfigurationKeys.ConfirmationTokenSecret);
        scenario["confirmationToken"] = GenerateJwtToken(
            userId,
            username,
@@ -468,7 +469,7 @@ public class AuthSteps(ScenarioContext scenario)
            ? user
            : throw new InvalidOperationException("registered username not found in scenario");

-        string secret = GetRequiredConfigValue("CONFIRMATION_TOKEN_SECRET");
+        string secret = GetRequiredConfigValue(ConfigurationKeys.ConfirmationTokenSecret);
        scenario["confirmationToken"] = GenerateJwtToken(
            userId,
            username,
--- a/web/backend/Database/Database.Connection/ConfigurationHelpers.cs
+++ b/web/backend/Database/Database.Connection/ConfigurationHelpers.cs
@@ -1,10 +0,0 @@
-using Microsoft.Extensions.Configuration;
-
-namespace Database.Connection;
-
-public static class ConfigurationHelpers
-{
-    public static string GetKeyOrThrow(IConfiguration configuration, string key) =>
-        configuration[key]
-        ?? throw new InvalidOperationException($"The {key} environment variable is not set.");
-}
--- a/web/backend/Database/Database.Connection/Database.Connection.csproj
+++ b/web/backend/Database/Database.Connection/Database.Connection.csproj
@@ -11,11 +11,14 @@
        <PackageReference Include="Microsoft.SqlServer.Types" Version="160.1000.6" />
        <PackageReference
            Include="Microsoft.Extensions.Configuration.Abstractions"
-            Version="9.0.0"
+            Version="10.0.1"
        />
        <PackageReference
            Include="Microsoft.Extensions.DependencyInjection.Abstractions"
            Version="10.0.0"
        />
    </ItemGroup>
+    <ItemGroup>
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
+    </ItemGroup>
 </Project>
--- a/web/backend/Database/Database.Connection/DefaultSqlConnectionFactory.cs
+++ b/web/backend/Database/Database.Connection/DefaultSqlConnectionFactory.cs
@@ -1,4 +1,4 @@
-using System.Data.Common;
+using Infrastructure.Configuration;
 using Microsoft.Data.SqlClient;
 using Microsoft.Extensions.Configuration;

@@ -19,7 +19,7 @@ public class DefaultSqlConnectionFactory(IConfiguration configuration) : ISqlCon
    {
        get
        {
-            string? fullConnectionString = configuration["DB_CONNECTION_STRING"];
+            string? fullConnectionString = configuration[ConfigurationKeys.DbConnectionString];
            if (!string.IsNullOrEmpty(fullConnectionString))
                return fullConnectionString;

--- a/web/backend/Database/Database.Connection/SqlConnectionStringHelper.cs
+++ b/web/backend/Database/Database.Connection/SqlConnectionStringHelper.cs
@@ -1,3 +1,4 @@
+using Infrastructure.Configuration;
 using Microsoft.Data.SqlClient;
 using Microsoft.Extensions.Configuration;

@@ -14,9 +15,15 @@ public static class SqlConnectionStringHelper
    ) =>
        new()
        {
-            DataSource = ConfigurationHelpers.GetKeyOrThrow(configuration, "DB_SERVER"),
-            UserID = ConfigurationHelpers.GetKeyOrThrow(configuration, "DB_USER"),
-            Password = ConfigurationHelpers.GetKeyOrThrow(configuration, "DB_PASSWORD"),
+            DataSource = ConfigurationHelpers.GetKeyOrThrow(
+                configuration,
+                ConfigurationKeys.DbServer
+            ),
+            UserID = ConfigurationHelpers.GetKeyOrThrow(configuration, ConfigurationKeys.DbUser),
+            Password = ConfigurationHelpers.GetKeyOrThrow(
+                configuration,
+                ConfigurationKeys.DbPassword
+            ),
            TrustServerCertificate = ResolveTrustServerCertificate(configuration),
            Encrypt = true,
        };
@@ -38,7 +45,10 @@ public static class SqlConnectionStringHelper
        try
        {
            SqlConnectionStringBuilder builder = MakeConfiguredConnectionBuilder(configuration);
-            builder.InitialCatalog = ConfigurationHelpers.GetKeyOrThrow(configuration, "DB_NAME");
+            builder.InitialCatalog = ConfigurationHelpers.GetKeyOrThrow(
+                configuration,
+                ConfigurationKeys.DbName
+            );
            connectionString = builder.ConnectionString;
            return true;
        }
@@ -95,7 +105,7 @@ public static class SqlConnectionStringHelper
    private static bool ResolveTrustServerCertificate(IConfiguration configuration)
    {
        return !bool.TryParse(
-                configuration["DB_TRUST_SERVER_CERTIFICATE"],
+                configuration[ConfigurationKeys.DbTrustServerCertificate],
                out bool trustServerCertificate
            ) || trustServerCertificate;
    }
--- a/web/backend/Database/Database.Migrations/Database.Migrations.csproj
+++ b/web/backend/Database/Database.Migrations/Database.Migrations.csproj
@@ -19,6 +19,7 @@
    </ItemGroup>
    <ItemGroup>
        <ProjectReference Include="..\..\Database\Database.Connection\Database.Connection.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
    </ItemGroup>
    <ItemGroup>
        <EmbeddedResource Include="scripts/**/*.sql" />
--- a/web/backend/Database/Database.Migrations/Program.cs
+++ b/web/backend/Database/Database.Migrations/Program.cs
@@ -1,4 +1,5 @@
 using Database.Connection;
+using Infrastructure.Configuration;
 using Microsoft.Data.SqlClient;
 using Microsoft.Extensions.Configuration;

@@ -21,7 +22,7 @@ internal static class Program
                .Build();

            bool clearDatabase = string.Equals(
-                configuration["CLEAR_DATABASE"],
+                configuration[ConfigurationKeys.ClearDatabase],
                "true",
                StringComparison.OrdinalIgnoreCase
            );
--- a/web/backend/Features/Features.Auth.Tests/Features.Auth.Tests.csproj
+++ b/web/backend/Features/Features.Auth.Tests/Features.Auth.Tests.csproj
@@ -21,5 +21,6 @@

    <ItemGroup>
        <ProjectReference Include="..\Features.Auth\Features.Auth.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
    </ItemGroup>
 </Project>
--- a/web/backend/Features/Features.Auth.Tests/Services/TokenServiceRefreshTests.cs
+++ b/web/backend/Features/Features.Auth.Tests/Services/TokenServiceRefreshTests.cs
@@ -5,6 +5,7 @@ using Features.Auth.Identity;
 using Features.Auth.Services;
 using Features.Auth.Tests.TestSupport;
 using FluentAssertions;
+using Infrastructure.Configuration;
 using Infrastructure.Jwt;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.Configuration;
@@ -27,9 +28,11 @@ public class TokenServiceRefreshTests
            .AddInMemoryCollection(
                new Dictionary<string, string?>
                {
-                    ["ACCESS_TOKEN_SECRET"] = "test-access-secret-that-is-very-long-1234567890",
-                    ["REFRESH_TOKEN_SECRET"] = "test-refresh-secret-that-is-very-long-1234567890",
-                    ["CONFIRMATION_TOKEN_SECRET"] =
+                    [ConfigurationKeys.AccessTokenSecret] =
+                        "test-access-secret-that-is-very-long-1234567890",
+                    [ConfigurationKeys.RefreshTokenSecret] =
+                        "test-refresh-secret-that-is-very-long-1234567890",
+                    [ConfigurationKeys.ConfirmationTokenSecret] =
                        "test-confirmation-secret-that-is-very-long-1234567890",
                }
            )
--- a/web/backend/Features/Features.Auth.Tests/Services/TokenServiceValidationTests.cs
+++ b/web/backend/Features/Features.Auth.Tests/Services/TokenServiceValidationTests.cs
@@ -4,6 +4,7 @@ using Domain.Exceptions;
 using Features.Auth.Services;
 using Features.Auth.Tests.TestSupport;
 using FluentAssertions;
+using Infrastructure.Configuration;
 using Infrastructure.Jwt;
 using Microsoft.Extensions.Configuration;
 using Moq;
@@ -23,9 +24,11 @@ public class TokenServiceValidationTests
            .AddInMemoryCollection(
                new Dictionary<string, string?>
                {
-                    ["ACCESS_TOKEN_SECRET"] = "test-access-secret-that-is-very-long-1234567890",
-                    ["REFRESH_TOKEN_SECRET"] = "test-refresh-secret-that-is-very-long-1234567890",
-                    ["CONFIRMATION_TOKEN_SECRET"] =
+                    [ConfigurationKeys.AccessTokenSecret] =
+                        "test-access-secret-that-is-very-long-1234567890",
+                    [ConfigurationKeys.RefreshTokenSecret] =
+                        "test-refresh-secret-that-is-very-long-1234567890",
+                    [ConfigurationKeys.ConfirmationTokenSecret] =
                        "test-confirmation-secret-that-is-very-long-1234567890",
                }
            )
--- a/web/backend/Features/Features.Auth/Features.Auth.csproj
+++ b/web/backend/Features/Features.Auth/Features.Auth.csproj
@@ -14,6 +14,7 @@
    <ItemGroup>
        <ProjectReference Include="..\..\Domain\Domain.Entities\Domain.Entities.csproj" />
        <ProjectReference Include="..\..\Domain\Domain.Exceptions\Domain.Exceptions.csproj" />
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Jwt\Infrastructure.Jwt.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.PasswordHashing\Infrastructure.PasswordHashing.csproj" />
        <ProjectReference Include="..\..\Database\Database.Connection\Database.Connection.csproj" />
--- a/web/backend/Features/Features.Auth/Services/TokenService.cs
+++ b/web/backend/Features/Features.Auth/Services/TokenService.cs
@@ -2,6 +2,7 @@ using System.IdentityModel.Tokens.Jwt;
 using System.Security.Claims;
 using Domain.Exceptions;
 using Features.Auth.Identity;
+using Infrastructure.Configuration;
 using Infrastructure.Jwt;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.Configuration;
@@ -33,23 +34,20 @@ public class TokenService : ITokenService
        _tokenInfrastructure = tokenInfrastructure;
        _userManager = userManager;

-        _accessTokenSecret =
-            configuration["ACCESS_TOKEN_SECRET"]
-            ?? throw new InvalidOperationException(
-                "ACCESS_TOKEN_SECRET environment variable is not set"
-            );
+        _accessTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.AccessTokenSecret
+        );

-        _refreshTokenSecret =
-            configuration["REFRESH_TOKEN_SECRET"]
-            ?? throw new InvalidOperationException(
-                "REFRESH_TOKEN_SECRET environment variable is not set"
-            );
+        _refreshTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.RefreshTokenSecret
+        );

-        _confirmationTokenSecret =
-            configuration["CONFIRMATION_TOKEN_SECRET"]
-            ?? throw new InvalidOperationException(
-                "CONFIRMATION_TOKEN_SECRET environment variable is not set"
-            );
+        _confirmationTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.ConfirmationTokenSecret
+        );
    }

    /// <inheritdoc />
--- a/web/backend/Features/Features.Emails/Features.Emails.csproj
+++ b/web/backend/Features/Features.Emails/Features.Emails.csproj
@@ -14,6 +14,7 @@
    </ItemGroup>

    <ItemGroup>
+        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Email\Infrastructure.Email.csproj" />
        <ProjectReference Include="..\..\Infrastructure\Infrastructure.Email.Templates\Infrastructure.Email.Templates.csproj" />
        <ProjectReference Include="..\..\Shared\Shared.Application\Shared.Application.csproj" />
--- a/web/backend/Features/Features.Emails/Services/EmailDispatcher.cs
+++ b/web/backend/Features/Features.Emails/Services/EmailDispatcher.cs
@@ -1,3 +1,4 @@
+using Infrastructure.Configuration;
 using Infrastructure.Email;
 using Infrastructure.Email.Templates.Rendering;
 using Microsoft.Extensions.Configuration;
@@ -21,8 +22,7 @@ public class EmailDispatcher(
    ///     Thrown when the <c>WEBSITE_BASE_URL</c> configuration value is not set.
    /// </exception>
    private string WebsiteBaseUrl =>
-        configuration["WEBSITE_BASE_URL"]
-        ?? throw new InvalidOperationException("WEBSITE_BASE_URL environment variable is not set");
+        ConfigurationHelpers.GetKeyOrThrow(configuration, ConfigurationKeys.WebsiteBaseUrl);

    /// <inheritdoc />
    public async Task SendRegistrationEmailAsync(
--- a/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationHelpers.cs
+++ b/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationHelpers.cs
@@ -0,0 +1,32 @@
+using Microsoft.Extensions.Configuration;
+
+namespace Infrastructure.Configuration;
+
+public static class ConfigurationHelpers
+{
+    public static string GetKeyOrThrow(IConfiguration configuration, string key) =>
+        configuration[key]
+        ?? throw new InvalidOperationException($"The {key} environment variable is not set.");
+
+    public static bool GetBooleanKeyOrThrow(IConfiguration configuration, string key)
+    {
+        string value = GetKeyOrThrow(configuration, key);
+
+        return bool.TryParse(value, out bool result)
+            ? result
+            : throw new InvalidOperationException(
+                $"The {key} environment variable is set to '{value}', which is not a valid boolean."
+            );
+    }
+
+    public static int GetIntKeyOrThrow(IConfiguration configuration, string key)
+    {
+        string value = GetKeyOrThrow(configuration, key);
+
+        return int.TryParse(value, out int result)
+            ? result
+            : throw new InvalidOperationException(
+                $"The {key} environment variable is set to '{value}', which is not a valid integer."
+            );
+    }
+}
--- a/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationKeys.cs
+++ b/web/backend/Infrastructure/Infrastructure.Configuration/ConfigurationKeys.cs
@@ -0,0 +1,33 @@
+namespace Infrastructure.Configuration;
+
+public static class ConfigurationKeys
+{
+    public const string AccessTokenSecret = "ACCESS_TOKEN_SECRET";
+    public const string RefreshTokenSecret = "REFRESH_TOKEN_SECRET";
+    public const string ConfirmationTokenSecret = "CONFIRMATION_TOKEN_SECRET";
+
+    /// <summary>
+    ///     Fallback configuration section path for the access-token signing key, checked when
+    ///     <see cref="AccessTokenSecret" /> is not set.
+    /// </summary>
+    public const string JwtSecretKeyFallback = "Jwt:SecretKey";
+
+    public const string WebsiteBaseUrl = "WEBSITE_BASE_URL";
+
+    public const string SmtpHost = "SMTP_HOST";
+    public const string SmtpPort = "SMTP_PORT";
+    public const string SmtpUsername = "SMTP_USERNAME";
+    public const string SmtpPassword = "SMTP_PASSWORD";
+    public const string SmtpUseSsl = "SMTP_USE_SSL";
+    public const string SmtpFromEmail = "SMTP_FROM_EMAIL";
+    public const string SmtpFromName = "SMTP_FROM_NAME";
+
+    public const string DbServer = "DB_SERVER";
+    public const string DbUser = "DB_USER";
+    public const string DbPassword = "DB_PASSWORD";
+    public const string DbName = "DB_NAME";
+    public const string DbConnectionString = "DB_CONNECTION_STRING";
+    public const string DbTrustServerCertificate = "DB_TRUST_SERVER_CERTIFICATE";
+
+    public const string ClearDatabase = "CLEAR_DATABASE";
+}
--- a/web/backend/Infrastructure/Infrastructure.Configuration/Infrastructure.Configuration.csproj
+++ b/web/backend/Infrastructure/Infrastructure.Configuration/Infrastructure.Configuration.csproj
@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>Infrastructure.Configuration</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference
+            Include="Microsoft.Extensions.Configuration.Abstractions"
+            Version="10.0.1"
+        />
+    </ItemGroup>
+</Project>
--- a/web/backend/Infrastructure/Infrastructure.Email/Infrastructure.Email.csproj
+++ b/web/backend/Infrastructure/Infrastructure.Email/Infrastructure.Email.csproj
@@ -13,4 +13,8 @@
            Version="10.0.1"
        />
    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\Infrastructure.Configuration\Infrastructure.Configuration.csproj" />
+    </ItemGroup>
 </Project>
--- a/web/backend/Infrastructure/Infrastructure.Email/SmtpEmailProvider.cs
+++ b/web/backend/Infrastructure/Infrastructure.Email/SmtpEmailProvider.cs
@@ -1,4 +1,5 @@
-using MailKit.Net.Smtp;
+using Infrastructure.Configuration;
+using MailKit.Net.Smtp;
 using MailKit.Security;
 using Microsoft.Extensions.Configuration;
 using MimeKit;
@@ -25,31 +26,27 @@ public class SmtpEmailProvider : IEmailProvider
    ///     <c>SMTP_FROM_EMAIL</c>, <c>SMTP_FROM_NAME</c>) from <paramref name="configuration" />.
    /// </summary>
    /// <exception cref="InvalidOperationException">
-    ///     Thrown when <c>SMTP_HOST</c> or <c>SMTP_FROM_EMAIL</c> is not set, or when <c>SMTP_PORT</c> is not a valid integer.
+    ///     Thrown when <c>SMTP_HOST</c>, <c>SMTP_PORT</c>, or <c>SMTP_FROM_EMAIL</c> is not set,
+    ///     or when <c>SMTP_PORT</c> is not a valid integer.
    /// </exception>
    public SmtpEmailProvider(IConfiguration configuration)
    {
-        _host =
-            configuration["SMTP_HOST"]
-            ?? throw new InvalidOperationException("SMTP_HOST environment variable is not set");
+        _host = ConfigurationHelpers.GetKeyOrThrow(configuration, ConfigurationKeys.SmtpHost);

-        string portString = configuration["SMTP_PORT"] ?? "587";
-        if (!int.TryParse(portString, out _port))
-            throw new InvalidOperationException($"SMTP_PORT '{portString}' is not a valid integer");
+        _port = ConfigurationHelpers.GetIntKeyOrThrow(configuration, ConfigurationKeys.SmtpPort);

-        _username = configuration["SMTP_USERNAME"];
-        _password = configuration["SMTP_PASSWORD"];
+        _username = configuration[ConfigurationKeys.SmtpUsername];
+        _password = configuration[ConfigurationKeys.SmtpPassword];

-        string useSslString = configuration["SMTP_USE_SSL"] ?? "true";
+        string useSslString = configuration[ConfigurationKeys.SmtpUseSsl] ?? "true";
        _useSsl = bool.Parse(useSslString);

-        _fromEmail =
-            configuration["SMTP_FROM_EMAIL"]
-            ?? throw new InvalidOperationException(
-                "SMTP_FROM_EMAIL environment variable is not set"
-            );
+        _fromEmail = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.SmtpFromEmail
+        );

-        _fromName = configuration["SMTP_FROM_NAME"] ?? "The Biergarten";
+        _fromName = configuration[ConfigurationKeys.SmtpFromName] ?? "The Biergarten";
    }

    /// <inheritdoc/>