PlanTempusApp/Database/Core/DDL/SetupIdentitySystem.cs

using Insight.Database;
using System.Data;

namespace Database.Core.DDL
{
    /// <summary>
    /// This is by purpose not async await
    /// It is intended that this is created with the correct Application User, which is why the schema name is omitted.
    /// </summary>
    public class SetupIdentitySystem : IDbConfigure<SetupIdentitySystem.Command>
    {
        public class Command
        {
            public required string Schema { get; init; }
        }

        readonly IDbConnection _db;
        IDbTransaction _transaction = null;
        Command _command;

        public SetupIdentitySystem(IDbConnection db)
        {
            _db = db;
        }

        /// <summary>
        /// Creates the system tables in the specified schema within a transaction.
        /// </summary>
        /// <param name="schema">The schema name where the tables will be created.</param>
        public void With(Command command)
        {
            _command = command;

            using (_transaction = _db.OpenWithTransaction())
            {
                try
                {
                    CreateUsersTable();
                    CreateOrganizationsTable();
                    CreateUserOrganizationsTable();
                    SetupRLS();

                    _transaction.Commit();
                }
                catch (Exception ex)
                {
                    _transaction.Rollback();
                    throw new InvalidOperationException("Failed to SetupIdentitySystem. Transaction is rolled back", ex);
                }
            }
        }
        private void ExecuteSql(string sql)
        {
            if (string.IsNullOrEmpty(sql))
                throw new ArgumentNullException(nameof(sql));

            _db.ExecuteSql(sql);
        }


        /// <summary>
        /// Creates the users table
        /// </summary>
        void CreateUsersTable()
        {
            var sql = @$"
                CREATE TABLE IF NOT EXISTS {_command.Schema}.users (
                    id SERIAL PRIMARY KEY,
                    email VARCHAR(256) NOT NULL UNIQUE,
                    password_hash VARCHAR(256) NOT NULL,
                    security_stamp VARCHAR(36) NOT NULL,
                    email_confirmed BOOLEAN NOT NULL DEFAULT FALSE,
                    access_failed_count INTEGER NOT NULL DEFAULT 0,
                    lockout_enabled BOOLEAN NOT NULL DEFAULT TRUE,
                    lockout_end TIMESTAMPTZ NULL,
                    is_active BOOLEAN NOT NULL DEFAULT TRUE,
                    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
                    last_login_at TIMESTAMPTZ NULL
                );";

            ExecuteSql(sql);

        }

        /// <summary>
        /// Creates the organizations table
        /// </summary>
        void CreateOrganizationsTable()
        {
            var sql = @$"
                CREATE TABLE IF NOT EXISTS {_command.Schema}.organizations (
                    id SERIAL PRIMARY KEY,
                    connection_string VARCHAR(500) NOT NULL,
                    is_active BOOLEAN NOT NULL DEFAULT TRUE,
                    created_by INTEGER NOT NULL REFERENCES {_command.Schema}.users(id),
                    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
                );";

            ExecuteSql(sql);

        }

        /// <summary>
        /// Creates the user_organizations table
        /// </summary>
        void CreateUserOrganizationsTable()
        {
            var sql = @$"
                CREATE TABLE IF NOT EXISTS {_command.Schema}.user_organizations (
                    user_id INTEGER NOT NULL REFERENCES {_command.Schema}.users(id),
                    organization_id INTEGER NOT NULL REFERENCES {_command.Schema}.organizations(id),
                    pin_code VARCHAR(10) NULL,
                    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
                    PRIMARY KEY (user_id, organization_id)
                );";

            ExecuteSql(sql);

        }

        /// <summary>
        /// Sets up Row Level Security (RLS) for the organizations and user_organizations tables.
        /// </summary>
        void SetupRLS()
        {
            var sql = new[]
                {
                    $"ALTER TABLE {_command.Schema}.organizations ENABLE ROW LEVEL SECURITY;",
                    $"ALTER TABLE {_command.Schema}.user_organizations ENABLE ROW LEVEL SECURITY;",
                    $"DROP POLICY IF EXISTS organization_access ON {_command.Schema}.organizations;",
                    @$"CREATE POLICY organization_access ON {_command.Schema}.organizations
                        USING (id IN (
                            SELECT organization_id 
                            FROM {_command.Schema}.user_organizations 
                            WHERE user_id = current_setting('app.user_id', TRUE)::INTEGER
                        )) WITH CHECK (true);",
                    $"DROP POLICY IF EXISTS user_organization_access ON {_command.Schema}.user_organizations;",
                    @$"CREATE POLICY user_organization_access ON {_command.Schema}.user_organizations
                        USING (user_id = current_setting('app.user_id', TRUE)::INTEGER) WITH CHECK (true);"
                };

            foreach (var statement in sql)
            {
                ExecuteSql(statement);
            }
        }


    }
}