Make hardening work with all db/schema managers

Previously, hardening only worked with databases, not with schemas. Also test that hardening works with all relevant db managers.

src/Bootstrappers/DatabaseTenancyBootstrapper.php

@@ -90,7 +90,9 @@ class DatabaseTenancyBootstrapper implements TenancyBootstrapper
     protected function verifyTenantCanUseDatabase(Tenant $tenant): void
     {
         /** @var \Stancl\Tenancy\Database\Models\Tenant&TenantWithDatabase $tenant */
-        $tenantDbName = $tenant->database()->getName();
+
+        $tenantDbConfig = $tenant->database();
+        $tenantDbName = $tenantDbConfig->getName();
 
         // Check that no other tenant uses this tenant's database
         if ($tenant::where($tenant->getTenantKeyName(), '!=', $tenant->getTenantKey())
@@ -99,13 +101,14 @@ class DatabaseTenancyBootstrapper implements TenancyBootstrapper
             throw new RuntimeException('Tenant cannot use a database of another tenant.');
         }
 
-        $centralDbName = DB::connection(
-            config('tenancy.database.central_connection', 'central')
-        )->getDatabaseName();
+        $manager = $tenantDbConfig->manager();
 
-        if (DB::getDatabaseName() === $centralDbName) {
-            // Throw if the current database is central.
-            // DB::getDatabaseName() is the current DB name, which should not be central at this point.
+        $centralConnection = DB::connection(config('tenancy.database.central_connection', 'central'));
+        $currentConnection = DB::connection();
+
+        // Throw if the current database/schema is central.
+        // At this point the connection should be the tenant's, so it should not match central.
+        if ($manager->getCurrentDatabaseName($currentConnection) === $manager->getCurrentDatabaseName($centralConnection)) {
             throw new RuntimeException('Tenant cannot use the central database.');
         }
     }

src/Database/Contracts/TenantDatabaseManager.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Stancl\Tenancy\Database\Contracts;
 
+use Illuminate\Database\Connection;
+
 interface TenantDatabaseManager
 {
     /** Create a database. */
@@ -17,4 +19,12 @@ interface TenantDatabaseManager
 
     /** Construct a DB connection config array. */
     public function makeConnectionConfig(array $baseConfig, string $databaseName): array;
+
+    /**
+     * Get the schema/database name that the given connection points to.
+     *
+     * In database managers, this should return the *database* name of the passed connection,
+     * while in schema managers, this should return the *schema* name of the passed connection.
+     */
+    public function getCurrentDatabaseName(Connection $connection): string;
 }

src/Database/TenantDatabaseManagers/PostgreSQLSchemaManager.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Stancl\Tenancy\Database\TenantDatabaseManagers;
 
+use Illuminate\Database\Connection;
 use Stancl\Tenancy\Database\Contracts\TenantWithDatabase;
 
 class PostgreSQLSchemaManager extends TenantDatabaseManager
@@ -37,4 +38,10 @@ class PostgreSQLSchemaManager extends TenantDatabaseManager
 
         return $baseConfig;
     }
+
+    public function getCurrentDatabaseName(Connection $connection): string
+    {
+        // Get the *schema* name (not the database name)
+        return $connection->selectOne('SELECT current_schema() AS schema')->schema;
+    }
 }

src/Database/TenantDatabaseManagers/SQLiteDatabaseManager.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Stancl\Tenancy\Database\TenantDatabaseManagers;
 
 use Closure;
+use Illuminate\Database\Connection;
 use Illuminate\Database\Eloquent\Model;
 use InvalidArgumentException;
 use PDO;
@@ -149,6 +150,11 @@ class SQLiteDatabaseManager implements TenantDatabaseManager
         return $baseConfig;
     }
 
+    public function getCurrentDatabaseName(Connection $connection): string
+    {
+        return $connection->getDatabaseName();
+    }
+
     public function getPath(string $name): string
     {
         $this->validateDatabaseName($name);

src/Database/TenantDatabaseManagers/TenantDatabaseManager.php

@@ -37,4 +37,9 @@ abstract class TenantDatabaseManager implements StatefulTenantDatabaseManager
 
         return $baseConfig;
     }
+
+    public function getCurrentDatabaseName(Connection $connection): string
+    {
+        return $connection->getDatabaseName();
+    }
 }