package aliyun

import (
	"crypto/hmac"
	"crypto/sha1"
	"encoding/base64"
	"encoding/json"
	"hospital-open-api/config"
	"strings"
	"time"
)

// GetOssSignResponse 获取oss签名返回值
type GetOssSignResponse struct {
	AccessId  string `json:"access_id"` // 主键id
	Host      string `json:"host"`
	Policy    string `json:"policy"`
	Signature string `json:"signature"`
	Expire    int64  `json:"expire"`
	Callback  string `json:"callback"`
	Dir       string `json:"dir"`
}

// GetOssSign 获取oss签名
func GetOssSign(dir string) (*GetOssSignResponse, error) {
	// Endpoint := config.C.Oss.OssEndpoint
	// accessKey := config.C.Oss.OssAccessKey
	// accessSecret := config.C.Oss.OssAccessKeySecret
	// client, err := oss.New(Endpoint, accessKey, accessSecret)
	// if err != nil {
	// 	return nil, err
	// }
	//
	// bucket, err := client.Bucket(viper.GetString("aliyun.Bucket"))
	// if err != nil {
	// 	return "", err
	// }

	now := time.Now()
	expire := 30 // 设置该policy超时时间是30s，即这个policy过了这个有效时间，将不能访问。
	end := now.Add(time.Second * time.Duration(expire))
	expiration := strings.Replace(end.Format("2006-01-02T15:04:05.000Z"), "+00:00", ".000Z", 1)

	start := []interface{}{"starts-with", "$key", dir}
	conditions := [][]interface{}{start}

	arr := map[string]interface{}{
		"expiration": expiration,
		"conditions": conditions,
	}
	policy, _ := json.Marshal(arr)
	base64Policy := base64.StdEncoding.EncodeToString(policy)
	stringToSign := base64Policy
	h := hmac.New(sha1.New, []byte(config.C.Oss.OssAccessKeySecret))
	h.Write([]byte(stringToSign))
	signature := base64.StdEncoding.EncodeToString(h.Sum(nil))

	response := &GetOssSignResponse{
		AccessId:  config.C.Oss.OssAccessKey,
		Host:      config.C.Oss.OssCustomDomainName,
		Policy:    base64Policy,
		Signature: signature,
		Expire:    end.Unix(),
		Callback:  "",
		Dir:       dir,
	}

	return response, nil
}