// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 plugins

import (
	"fmt"

	adctypes "github.com/apache/apisix-ingress-controller/api/adc"
	"github.com/apache/apisix-ingress-controller/internal/adc/translator/annotations"
)

type csrf struct{}

// NewCSRFHandler creates a handler to convert annotations about
// CSRF to APISIX csrf plugin.
func NewCSRFHandler() PluginAnnotationsHandler {
	return &csrf{}
}

func (c *csrf) PluginName() string {
	return "csrf"
}

func (c *csrf) Handle(e annotations.Extractor) (any, error) {
	if !e.GetBoolAnnotation(annotations.AnnotationsEnableCsrf) {
		return nil, nil
	}

	key := e.GetStringAnnotation(annotations.AnnotationsCsrfKey)
	if key == "" {
		// csrf requested without a key: the webhook rejects this, but log a
		// breadcrumb for the cases it cannot cover (webhook off, pre-upgrade
		// Ingress). Parse skips only this plugin, the rest of the route stands.
		return nil, fmt.Errorf("annotation %q is enabled but %q is missing or empty",
			annotations.AnnotationsEnableCsrf, annotations.AnnotationsCsrfKey)
	}

	return &adctypes.CSRFConfig{
		Key: key,
	}, nil
}
