/*
Copyright 2018 The Kubernetes Authors.

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 auth

import (
	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider/alicloud/alibaba-cloud-sdk-go/sdk/requests"
	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider/alicloud/alibaba-cloud-sdk-go/sdk/utils"
	"net/url"
	"sort"
	"strings"
)

func signRpcRequest(request requests.AcsRequest, signer Signer, regionId string) (err error) {
	err = completeRpcSignParams(request, signer, regionId)
	if err != nil {
		return
	}
	// remove while retry
	if _, containsSign := request.GetQueryParams()["Signature"]; containsSign {
		delete(request.GetQueryParams(), "Signature")
	}
	stringToSign := buildRpcStringToSign(request)
	request.SetStringToSign(stringToSign)
	signature := signer.Sign(stringToSign, "&")
	request.GetQueryParams()["Signature"] = signature

	return
}

func completeRpcSignParams(request requests.AcsRequest, signer Signer, regionId string) (err error) {
	queryParams := request.GetQueryParams()
	queryParams["Version"] = request.GetVersion()
	queryParams["Action"] = request.GetActionName()
	queryParams["Format"] = request.GetAcceptFormat()
	queryParams["Timestamp"] = utils.GetTimeInFormatISO8601()
	queryParams["SignatureMethod"] = signer.GetName()
	queryParams["SignatureType"] = signer.GetType()
	queryParams["SignatureVersion"] = signer.GetVersion()
	queryParams["SignatureNonce"] = utils.GetUUIDV4()
	queryParams["AccessKeyId"], err = signer.GetAccessKeyId()

	if err != nil {
		return
	}

	if _, contains := queryParams["RegionId"]; !contains {
		queryParams["RegionId"] = regionId
	}
	if extraParam := signer.GetExtraParam(); extraParam != nil {
		for key, value := range extraParam {
			queryParams[key] = value
		}
	}

	request.GetHeaders()["Content-Type"] = requests.Form
	formString := utils.GetUrlFormedMap(request.GetFormParams())
	request.SetContent([]byte(formString))

	return
}

func buildRpcStringToSign(request requests.AcsRequest) (stringToSign string) {
	signParams := make(map[string]string)
	for key, value := range request.GetQueryParams() {
		signParams[key] = value
	}
	for key, value := range request.GetFormParams() {
		signParams[key] = value
	}

	// sort params by key
	var paramKeySlice []string
	for key := range signParams {
		paramKeySlice = append(paramKeySlice, key)
	}
	sort.Strings(paramKeySlice)
	stringToSign = utils.GetUrlFormedMap(signParams)
	stringToSign = strings.Replace(stringToSign, "+", "%20", -1)
	stringToSign = strings.Replace(stringToSign, "*", "%2A", -1)
	stringToSign = strings.Replace(stringToSign, "%7E", "~", -1)
	stringToSign = url.QueryEscape(stringToSign)
	stringToSign = request.GetMethod() + "&%2F&" + stringToSign
	return
}