Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/generators/router.go

@@ -0,0 +1,44 @@
+package generators
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/nicholas-fedor/shoutrrr/pkg/generators/basic"
+	"github.com/nicholas-fedor/shoutrrr/pkg/generators/xouath2"
+	"github.com/nicholas-fedor/shoutrrr/pkg/services/telegram"
+	"github.com/nicholas-fedor/shoutrrr/pkg/types"
+)
+
+var ErrUnknownGenerator = errors.New("unknown generator")
+
+var generatorMap = map[string]func() types.Generator{
+	"basic":    func() types.Generator { return &basic.Generator{} },
+	"oauth2":   func() types.Generator { return &xouath2.Generator{} },
+	"telegram": func() types.Generator { return &telegram.Generator{} },
+}
+
+// NewGenerator creates an instance of the generator that corresponds to the provided identifier.
+func NewGenerator(identifier string) (types.Generator, error) {
+	generatorFactory, valid := generatorMap[strings.ToLower(identifier)]
+	if !valid {
+		return nil, fmt.Errorf("%w: %q", ErrUnknownGenerator, identifier)
+	}
+
+	return generatorFactory(), nil
+}
+
+// ListGenerators lists all available generators.
+func ListGenerators() []string {
+	generators := make([]string, len(generatorMap))
+
+	i := 0
+
+	for key := range generatorMap {
+		generators[i] = key
+		i++
+	}
+
+	return generators
+}