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118 lines
2.6 KiB
118 lines
2.6 KiB
package oss
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import (
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"bytes"
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"crypto"
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"crypto/md5"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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"github.com/cloudreve/Cloudreve/v3/pkg/cache"
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"github.com/cloudreve/Cloudreve/v3/pkg/request"
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)
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// GetPublicKey 从回调请求或缓存中获取OSS的回调签名公钥
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func GetPublicKey(r *http.Request) ([]byte, error) {
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var pubKey []byte
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// 尝试从缓存中获取
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pub, exist := cache.Get("oss_public_key")
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if exist {
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return pub.([]byte), nil
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}
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// 从请求中获取
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pubURL, err := base64.StdEncoding.DecodeString(r.Header.Get("x-oss-pub-key-url"))
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if err != nil {
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return pubKey, err
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}
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// 确保这个 public key 是由 OSS 颁发的
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if !strings.HasPrefix(string(pubURL), "http://gosspublic.alicdn.com/") &&
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!strings.HasPrefix(string(pubURL), "https://gosspublic.alicdn.com/") {
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return pubKey, errors.New("公钥URL无效")
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}
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// 获取公钥
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client := request.HTTPClient{}
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body, err := client.Request("GET", string(pubURL), nil).
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CheckHTTPResponse(200).
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GetResponse()
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if err != nil {
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return pubKey, err
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}
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// 写入缓存
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_ = cache.Set("oss_public_key", []byte(body), 86400*7)
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return []byte(body), nil
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}
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func getRequestMD5(r *http.Request) ([]byte, error) {
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var byteMD5 []byte
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// 获取请求正文
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body, err := ioutil.ReadAll(r.Body)
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r.Body.Close()
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if err != nil {
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return byteMD5, err
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}
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r.Body = ioutil.NopCloser(bytes.NewReader(body))
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strURLPathDecode, err := url.PathUnescape(r.URL.Path)
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if err != nil {
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return byteMD5, err
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}
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strAuth := fmt.Sprintf("%s\n%s", strURLPathDecode, string(body))
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md5Ctx := md5.New()
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md5Ctx.Write([]byte(strAuth))
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byteMD5 = md5Ctx.Sum(nil)
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return byteMD5, nil
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}
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// VerifyCallbackSignature 验证OSS回调请求
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func VerifyCallbackSignature(r *http.Request) error {
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bytePublicKey, err := GetPublicKey(r)
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if err != nil {
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return err
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}
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byteMD5, err := getRequestMD5(r)
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if err != nil {
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return err
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}
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strAuthorizationBase64 := r.Header.Get("authorization")
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if strAuthorizationBase64 == "" {
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return errors.New("no authorization field in Request header")
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}
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authorization, _ := base64.StdEncoding.DecodeString(strAuthorizationBase64)
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pubBlock, _ := pem.Decode(bytePublicKey)
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if pubBlock == nil {
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return errors.New("pubBlock not exist")
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}
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pubInterface, err := x509.ParsePKIXPublicKey(pubBlock.Bytes)
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if (pubInterface == nil) || (err != nil) {
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return err
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}
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pub := pubInterface.(*rsa.PublicKey)
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errorVerifyPKCS1v15 := rsa.VerifyPKCS1v15(pub, crypto.MD5, byteMD5, authorization)
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if errorVerifyPKCS1v15 != nil {
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return errorVerifyPKCS1v15
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}
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return nil
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}
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