sql: Begin cleanup of code

internal/component/sql/provision.go

@@ -0,0 +1,52 @@
+package sql
+
+import (
+	"errors"
+
+	"github.com/FAU-CDI/wisski-distillery/pkg/sqle"
+)
+
+// SQLProvision provisions a new sql database and user
+func (sql *SQL) Provision(name, user, password string) error {
+	// wait for the database
+	if err := sql.WaitShell(); err != nil {
+		return err
+	}
+
+	// it's not a safe database name!
+	if !sqle.IsSafeDatabaseName(name) {
+		return errInvalidDatabaseName
+	}
+
+	// create the database and user!
+	if !sql.Query("CREATE DATABASE `"+name+"`; CREATE USER ?@`%` IDENTIFIED BY ?; GRANT ALL PRIVILEGES ON `"+name+"`.* TO ?@`%`; FLUSH PRIVILEGES;", user, password, user) {
+		return errors.New("SQLProvision: Failed to create user")
+	}
+
+	// and done!
+	return nil
+}
+
+var errSQLPurgeUser = errors.New("unable to delete user")
+
+// SQLPurgeUser deletes the specified user from the database
+func (sql *SQL) PurgeUser(user string) error {
+	if !sql.Query("DROP USER IF EXISTS ?@`%`; FLUSH PRIVILEGES; ", user) {
+		return errSQLPurgeUser
+	}
+
+	return nil
+}
+
+var errSQLPurgeDB = errors.New("unable to drop database")
+
+// SQLPurgeDatabase deletes the specified db from the database
+func (sql *SQL) PurgeDatabase(db string) error {
+	if !sqle.IsSafeDatabaseName(db) {
+		return errSQLPurgeDB
+	}
+	if !sql.Query("DROP DATABASE IF EXISTS `" + db + "`") {
+		return errSQLPurgeDB
+	}
+	return nil
+}