begin work

web/backend/Database/Database.Seed/DatabaseHelpers.cs

@@ -0,0 +1,54 @@
+using Microsoft.Data.SqlClient;
+
+namespace Database.Seed;
+
+public class ConnectionStrings
+{
+    /// <summary>
+    /// Builds a SQL Server connection string from the <c>DB_SERVER</c>, <c>DB_NAME</c>,
+    /// <c>DB_USER</c>, <c>DB_PASSWORD</c>, and <c>DB_TRUST_SERVER_CERTIFICATE</c>
+    /// environment variables.
+    /// </summary>
+    /// <returns>A fully built SQL Server connection string.</returns>
+    /// <exception cref="InvalidOperationException">
+    /// Thrown when <c>DB_SERVER</c>, <c>DB_NAME</c>, <c>DB_USER</c>, or <c>DB_PASSWORD</c>
+    /// is not set.
+    /// </exception>
+    private static string GetSqlServerConnectionString()
+    {
+        string server =
+            Environment.GetEnvironmentVariable("DB_SERVER")
+            ?? throw new InvalidOperationException("DB_SERVER environment variable is not set");
+
+        string dbName =
+            Environment.GetEnvironmentVariable("DB_NAME")
+            ?? throw new InvalidOperationException("DB_NAME environment variable is not set");
+
+        string user =
+            Environment.GetEnvironmentVariable("DB_USER")
+            ?? throw new InvalidOperationException("DB_USER environment variable is not set");
+
+        string password =
+            Environment.GetEnvironmentVariable("DB_PASSWORD")
+            ?? throw new InvalidOperationException("DB_PASSWORD environment variable is not set");
+
+        string trustServerCertificate =
+            Environment.GetEnvironmentVariable("DB_TRUST_SERVER_CERTIFICATE") ?? "True";
+
+        SqlConnectionStringBuilder builder = new()
+        {
+            DataSource = server,
+            InitialCatalog = dbName,
+            UserID = user,
+            Password = password,
+            TrustServerCertificate = bool.Parse(trustServerCertificate),
+            Encrypt = true,
+        };
+
+        return builder.ConnectionString;
+    }
+
+
+    public static string SqlServerConnectionString => GetSqlServerConnectionString();
+    public static string SqliteConnectionString => "Data Source=seed.sqlite";
+}