feat: oidc client create command (#672)

* feat: add oidc client create command

* refactor: use own utility for creating random strings (more flexible
than stdlib)

* feat: validate client name to avoid config errors

* refactor: limit to only alphanumeric characters and hyphens

* refactor: remove the need of the logger in the create oidc client cmd

cmd/tinyauth/create_oidc_client.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+
+	"github.com/google/uuid"
+	"github.com/steveiliop56/tinyauth/internal/utils"
+	"github.com/traefik/paerser/cli"
+)
+
+func createOidcClientCmd() *cli.Command {
+	return &cli.Command{
+		Name:          "create",
+		Description:   "Create a new OIDC Client",
+		Configuration: nil,
+		Resources:     nil,
+		AllowArg:      true,
+		Run: func(args []string) error {
+			if len(args) == 0 {
+				return errors.New("client name is required. use tinyauth oidc create <name>")
+			}
+
+			clientName := args[0]
+
+			match, err := regexp.MatchString("^[a-zA-Z0-9-]*$", clientName)
+
+			if !match || err != nil {
+				return errors.New("client name can only contain alphanumeric characters and hyphens")
+			}
+
+			uuid := uuid.New()
+			clientId := uuid.String()
+			clientSecret := "ta-" + utils.GenerateString(61)
+
+			fmt.Printf("Client Name: %s\n", clientName)
+			fmt.Printf("Client ID: %s\n", clientId)
+			fmt.Printf("Client Secret: %s\n", clientSecret)
+			return nil
+		},
+	}
+}