89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
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package oss
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import (
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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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"io/ioutil"
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"net/http"
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"regexp"
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"strings"
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"sync"
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)
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type authenticationType struct {
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lock *sync.RWMutex
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certificate map[string]*rsa.PublicKey
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}
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var (
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authentication = authenticationType{lock: &sync.RWMutex{}, certificate: map[string]*rsa.PublicKey{}}
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urlReg = regexp.MustCompile(`^http(|s)://gosspublic.alicdn.com/[0-9a-zA-Z]`)
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)
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//验证OSS向业务服务器发来的回调函数。
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//该方法是并发安全的
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//pubKeyUrl 回调请求头中[x-oss-pub-key-url]一项，以Base64编码
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//reqUrl oss所发来请求的url，由path+query组成
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//reqBody oss所发来请求的body
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//authorization authorization为回调头中的签名
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func AuthenticateCallBack(pubKeyUrl, reqUrl, reqBody, authorization string) error {
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//获取证书url
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keyURL, err := base64.URLEncoding.DecodeString(pubKeyUrl)
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if err != nil {
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return err
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}
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url := string(keyURL)
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//判断证书是否来自于阿里云
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if !urlReg.Match(keyURL) {
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return errors.New("certificate address error")
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}
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//获取文件名
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rs := []rune(url)
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filename := string(rs[strings.LastIndex(url, "/") : len(rs)-1])
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authentication.lock.RLock()
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certificate := authentication.certificate[filename]
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authentication.lock.RUnlock()
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//内存中没有证书，下载
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if certificate == nil {
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authentication.lock.Lock()
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res, err := http.Get(url)
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if err != nil {
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return err
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}
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return err
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}
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block, _ := pem.Decode(body)
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if block == nil {
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return errors.New("certificate error")
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}
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pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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return err
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}
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certificate = pubKey.(*rsa.PublicKey)
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authentication.certificate[filename] = certificate
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authentication.lock.Unlock()
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}
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//证书准备完毕，开始验证
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//解析签名
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signature, err := base64.StdEncoding.DecodeString(authorization)
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if err != nil {
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return err
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}
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hashed := md5.New()
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hashed.Write([]byte(reqUrl + "\n" + reqBody))
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if err := rsa.VerifyPKCS1v15(certificate, crypto.MD5, hashed.Sum(nil), signature); err != nil {
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return err
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}
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//验证通过
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return nil
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}
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