[ticket/15055] Properly support index length check on mssql

PHPBB3-15055

phpBB/phpbb/db/tools/mssql.php

@@ -545,10 +545,7 @@ class mssql extends tools
 	{
 		$statements = array();
 
-		if ($this->mssql_is_sql_server_2000())
-		{
 		$this->check_index_name_length($table_name, $index_name);
-		}
 
 		// remove index length
 		$column = preg_replace('#:.*$#', '', $column);
@@ -558,6 +555,21 @@ class mssql extends tools
 		return $this->_sql_run_sql($statements);
 	}
 
+	/**
+	 * {@inheritdoc}
+	 */
+	protected function get_max_index_name_length()
+	{
+		if ($this->mssql_is_sql_server_2000())
+		{
+			return parent::get_max_index_name_length();
+		}
+		else
+		{
+			return 128;
+		}
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

phpBB/phpbb/db/tools/tools.php

@@ -1561,7 +1561,8 @@ class tools implements tools_interface
 	 */
 	protected function check_index_name_length($table_name, $index_name, $throw_error = true)
 	{
-		if (strlen($index_name) > 30)
+		$max_index_name_length = $this->get_max_index_name_length();
+		if (strlen($index_name) > $max_index_name_length)
 		{
 			// Try removing the table prefix if it's at the beginning
 			$table_prefix = substr(CONFIG_TABLE, 0, -6); // strlen(config)
@@ -1582,13 +1583,23 @@ class tools implements tools_interface
 
 			if ($throw_error)
 			{
-				trigger_error("Index name '$index_name' on table '$table_name' is too long. The maximum is 30 characters.", E_USER_ERROR);
+				trigger_error("Index name '$index_name' on table '$table_name' is too long. The maximum is $max_index_name_length characters.", E_USER_ERROR);
 			}
 		}
 
 		return $index_name;
 	}
 
+	/**
+	 * Get maximum index name length. Might vary depending on db type
+	 *
+	 * @return int Maximum index name length
+	 */
+	protected function get_max_index_name_length()
+	{
+		return 30;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

tests/dbal/db_tools_test.php

@@ -439,29 +439,39 @@ class phpbb_dbal_db_tools_test extends phpbb_database_test_case
 			$this->markTestIncomplete('The table prefix length is too long for proper testing of index shortening function.');
 		}
 
+		$max_index_length = 30;
+
+		if ($this->tools instanceof \phpbb\db\tools\mssql)
+		{
+			$max_length_method = new ReflectionMethod('\phpbb\db\tools\mssql', 'get_max_index_name_length');
+			$max_length_method->setAccessible(true);
+			$max_index_length = $max_length_method->invoke($this->tools);
+		}
+
 		$table_suffix = str_repeat('a', 25 - strlen($table_prefix));
 		$table_name = $table_prefix . $table_suffix;
 
 		$this->tools->sql_create_table($table_name, $this->table_data);
 
-		// Index name and table suffix and table prefix have > 30 chars in total.
+		// Index name and table suffix and table prefix have > maximum index length chars in total.
-		// Index name and table suffix have <= 30 chars in total.
+		// Index name and table suffix have <= maximum index length chars in total.
-		$long_index_name = str_repeat('i', 30 - strlen($table_suffix));
+		$long_index_name = str_repeat('i', $max_index_length - strlen($table_suffix));
 		$this->assertFalse($this->tools->sql_index_exists($table_name, $long_index_name));
 		$this->assertTrue($this->tools->sql_create_index($table_name, $long_index_name, array('c_timestamp')));
 		$this->assertTrue($this->tools->sql_index_exists($table_name, $long_index_name));
 
-		// Index name and table suffix have > 30 chars in total.
+		// Index name and table suffix have > maximum index length chars in total.
-		$very_long_index_name = str_repeat('i', 30);
+		$very_long_index_name = str_repeat('i', $max_index_length);
 		$this->assertFalse($this->tools->sql_index_exists($table_name, $very_long_index_name));
 		$this->assertTrue($this->tools->sql_create_index($table_name, $very_long_index_name, array('c_timestamp')));
 		$this->assertTrue($this->tools->sql_index_exists($table_name, $very_long_index_name));
 
 		$this->tools->sql_table_drop($table_name);
 
-		// Index name has > 30 chars - that should not be possible.
+		// Index name has > maximum index length chars - that should not be possible.
-		$too_long_index_name = str_repeat('i', 31);
+		$too_long_index_name = str_repeat('i', $max_index_length + 1);
 		$this->assertFalse($this->tools->sql_index_exists('prefix_table_name', $too_long_index_name));
+		$this->setExpectedTriggerError(E_USER_ERROR);
 		$this->tools->sql_create_index('prefix_table_name', $too_long_index_name, array('c_timestamp'));
 	}
 }