feat: Added admin CLI, created api endpoint for creating new user, cr… (#68)

* feat: Added admin CLI, created api endpoint for creating new user, created action for admin CLI to create a new user, changed the authentication middleware to verify the users from db

* feat: Added both single and multi user support, added caching layer for getting IAM users

* fix: Added all the files

s3api/controllers/admin.go

@@ -0,0 +1,49 @@
+// Copyright 2023 Versity Software
+// This file is licensed under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package controllers
+
+import (
+	"fmt"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/versity/versitygw/backend/auth"
+)
+
+type AdminController struct {
+	IAMService auth.IAMService
+}
+
+func NewAdminController() AdminController {
+	return AdminController{IAMService: auth.New()}
+}
+
+func (c AdminController) CreateUser(ctx *fiber.Ctx) error {
+	access, secret, role, region := ctx.Query("access"), ctx.Query("secret"), ctx.Query("role"), ctx.Query("region")
+	requesterRole := ctx.Locals("role")
+
+	if requesterRole != "admin" {
+		return fmt.Errorf("access denied: only admin users have access to this resource")
+	}
+
+	user := auth.Account{Secret: secret, Role: role, Region: region}
+
+	err := c.IAMService.CreateAccount(access, &user)
+	if err != nil {
+		return fmt.Errorf("failed to create a user: %w", err)
+	}
+
+	ctx.SendString("The user has been created successfully")
+	return nil
+}