Move instances into a separate component

internal/component/instances/wisski_create.go

@@ -0,0 +1,61 @@
+package instances
+
+import (
+	"errors"
+	"path/filepath"
+
+	"github.com/FAU-CDI/wisski-distillery/pkg/stringparser"
+)
+
+var errInvalidSlug = errors.New("not a valid slug")
+
+// Create fills the struct for a new WissKI instance.
+// It validates that slug is a valid name for an instance.
+//
+// It does not perform any checks if the instance already exists, or does the creation in the database.
+func (instances *Instances) Create(slug string) (wisski WissKI, err error) {
+
+	// make sure that the slug is valid!
+	if _, err := stringparser.ParseSlug(slug); err != nil {
+		return wisski, errInvalidSlug
+	}
+
+	wisski.Instance.Slug = slug
+	wisski.Instance.FilesystemBase = filepath.Join(instances.Dir, slug)
+
+	wisski.Instance.OwnerEmail = ""
+	wisski.Instance.AutoBlindUpdateEnabled = true
+
+	// sql
+
+	wisski.Instance.SqlDatabase = instances.Config.MysqlDatabasePrefix + slug
+	wisski.Instance.SqlUsername = instances.Config.MysqlUserPrefix + slug
+
+	wisski.Instance.SqlPassword, err = instances.Config.NewPassword()
+	if err != nil {
+		return WissKI{}, err
+	}
+
+	// triplestore
+
+	wisski.Instance.GraphDBRepository = instances.Config.GraphDBRepoPrefix + slug
+	wisski.Instance.GraphDBUsername = instances.Config.GraphDBUserPrefix + slug
+
+	wisski.Instance.GraphDBPassword, err = instances.Config.NewPassword()
+	if err != nil {
+		return WissKI{}, err
+	}
+
+	// drupal
+
+	wisski.DrupalUsername = "admin" // TODO: Change this!
+
+	wisski.DrupalPassword, err = instances.Config.NewPassword()
+	if err != nil {
+		return wisski, err
+	}
+
+	// store the instance in the object and return it!
+	wisski.instances = instances
+	return wisski, nil
+}