这篇文章主要介绍“Go GCM gin中间件怎么加密解密文件”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“go GCM gin中间件怎么加密解密文件”文章能帮
这篇文章主要介绍“Go GCM gin中间件怎么加密解密文件”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“go GCM gin中间件怎么加密解密文件”文章能帮助大家解决问题。
要给已有的系统启用加密解密,目前推荐的是aes的gcm模式的加密和解密,在微服务如果向前有公共方法处理 读取数据和写返回数据,那么比较简单,修改以前的公共方法,但是这样本地调试平时肯定是明文,所以要加判断,如果以前的读数据和写数据是五花八门那就比较麻烦,在微服务体系里面一般有网关这个服务,所以加密和解密就放在网关服务,大致如下:
常规的请求有GET,POST JSON, POST file,以及POST FORM表单,返回一般是json 或者下载文件流,所以我们需要截获请求流和返回流,收到请求流解密数据 然后重新写入到请求流,收到返回流加密数据,重写返回流。
首先来看aes加密和解密程序aes.go
package aesimport ("crypto/aes""crypto/cipher""crypto/md5""crypto/rand""encoding/base64""encoding/hex""errors""io")//加密字符串func GcmEncrypt(key, plaintext string) (string, error) {if len(key) != 32 && len(key) != 24 && len(key) != 16 {return "", errors.New("the length of key is error")}if len(plaintext) < 1 {return "", errors.New("plaintext is null")}keyByte := []byte(key)plainByte:=[]byte(plaintext)block, err := aes.NewCipher(keyByte)if err != nil {return "", err}aesGcm, err := cipher.NewGCM(block)if err != nil {return "", err}nonce := make([]byte, 12)if _, err := io.ReadFull(rand.Reader, nonce); err != nil {return "", err}seal := aesGcm.Seal(nonce, nonce, plainByte, nil)return base64.URLEncoding.EncodeToString(seal), nil}//解密字符串func GcmDecrypt(key, cipherText string) (string, error) {if len(key) != 32 && len(key) != 24 && len(key) != 16 {return "", errors.New("the length of key is error")}if len(cipherText) < 1 {return "", errors.New("cipherText is null")}cipherByte, err := base64.URLEncoding.DecodeString(cipherText)if err != nil {return "", err}if len(cipherByte) < 12 {return "", errors.New("cipherByte is error")}nonce, cipherByte := cipherByte[:12], cipherByte[12:]keyByte := []byte(key)block, err := aes.NewCipher(keyByte)if err != nil {return "", err}aesGcm, err := cipher.NewGCM(block)if err != nil {return "", err}plainByte, err := aesGcm.Open(nil, nonce, cipherByte, nil)if err != nil {return "", err}return string(plainByte), nil}//生成32位md5字串func GetAesKey(s string) string {h := md5.New()h.Write([]byte(s))return hex.EncodeToString(h.Sum(nil))}
再来看看网关转发程序proxy.go
package middlewareimport ("fmt""GitHub.com/gin-gonic/gin""github.com/valyala/fastHttp""io/ioutil""runtime/debug""time")var fastClient *fasthttp.Clientfunc init() {fastClient = &fasthttp.Client{}fastClient.MaxIdemponentCallAttempts = 1fastClient.ReadTimeout = time.Second * 60}func GetHttpClient() *fasthttp.Client {return fastClient}func GateWay() gin.HandlerFunc {return func(c *gin.Context) {defer func() {if e := recover(); e != nil {stack := debug.Stack()log("GateWay Recovery: err:%v, stack:%v", e, string(stack))}}()err := Forward(c)if err != nil {response(c, 9999, "系统错误", err.Error())}return}}func Forward(ctx *gin.Context) error {req := &fasthttp.Request{}//请求-获取服务地址host := "http://localhost:8000/" + ctx.Request.URL.String()//请求-urlreq.SetRequestURI(host)//请求-headerfor k, v := range ctx.Request.Header {req.Header.Set(k, v[0])}//请求-bodydata, err := ioutil.ReadAll(ctx.Request.Body)if err != nil {log("Forward err:%v", err)return fmt.Errorf("系统错误")}req.SetBody(data)//请求-方法req.Header.SetMethod(ctx.Request.Method)//请求-发送resp := &fasthttp.Response{}//请求-新增调用链err = GetHttpClient().Do(req, resp)if err != nil {log("Forward GetHttpClient DO err:%v", err)return fmt.Errorf("系统错误")}//请求-响应ContentType := fmt.Sprintf("%s", resp.Header.Peek("Content-Type"))ctx.Data(resp.StatusCode(), ContentType, resp.Body())return nil}type HTTPHeadersCarrier struct {*fasthttp.RequestHeader}func (c HTTPHeadersCarrier) Set(key, val string) {h := c.RequestHeaderh.Add(key, val)}
最后来看一下gin的中间件crypto.go
package middlewareimport ("bytes""demo/aes""encoding/json""errors""fmt""github.com/gin-gonic/gin""io""io/ioutil""mime""mime/multipart""net/url""runtime/debug""strconv""strings")type aesWriter struct {gin.ResponseWriterbody *bytes.Buffer}func (w *aesWriter) Write(b []byte) (int, error) {return w.body.Write(b)}func (w *aesWriter) WriteString(s string) (int, error) {return w.body.WriteString(s)}//只有经过token 验证的才会加密 和解密//handleFile 表示是否处理上传文件, 默认网关不处理上传文件的encryptString数据, 如果处理会导致具体服务无法接收到具体参数func AesGcmDecrypt() gin.HandlerFunc {return func(c *gin.Context) {defer func() {if e := recover(); e != nil {stack := debug.Stack()log("AesGcmDecrypt Recovery: err:%v, stack:%v", e, string(stack))}}()if c.Request.Method == "OPTIONS" {c.Next()} else {md5key := aes.GetAesKey("gavin12345678")log("AesGcmDecrypt start url:%s ,md5key:%s, Method:%s, Header:%+v", c.Request.URL.String(), md5key, c.Request.Method, c.Request.Header)handleAes(c, md5key)}}}//请求和返回都加密 解密func handleAes(c *gin.Context, md5key string) {contentType := c.Request.Header.Get("Content-Type")isJsonRequest := strings.Contains(contentType, "application/json")isFileRequest := strings.Contains(contentType, "multipart/form-data")isFormUrl := strings.Contains(contentType, "application/x-www-form-urlencoded")if c.Request.Method == "GET" {err := parseQuery(c, md5key)if err != nil {log("handleAes parseQuery err:%v", err)//这里输出应该密文 一旦加密解密调试好 这里就不会走进来response(c, 2001, "系统错误", err.Error())return}} else if isJsonRequest {err := parseJson(c, md5key)if err != nil {log("handleAes parseJson err:%v", err)//这里输出应该密文 一旦加密解密调试好 这里就不会走进来response(c, 2001, "系统错误", err.Error())return}} else if isFormUrl {err := parseForm(c, md5key)if err != nil {log("handleAes parseForm err:%v", err)//这里输出应该密文 一旦加密解密调试好 这里就不会走进来response(c, 2001, "系统错误", err.Error())return}} else if isFileRequest {err := parseFile(c, md5key)if err != nil {log("handleAes parseFile err:%v", err)//这里输出应该密文 一旦加密解密调试好 这里就不会走进来response(c, 2001, "系统错误", err.Error())return}}///截取 response bodyoldWriter := c.Writerblw := &aesWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}c.Writer = blw// 走流程c.Next()///获取返回数据responseByte := blw.body.Bytes()//日志c.Writer = oldWriter//如果返回的不是json格式 那么直接返回,应为文件下载之类的不应该加密if !isJsonResponse(c) {_, _ = c.Writer.Write(responseByte)return}///加密encryptStr, err := aes.GcmEncrypt(md5key, string(responseByte))if err != nil {log("handleAes GcmEncrypt err:%v", err)response(c, 2001, "系统错误", err.Error())return}_, _ = c.Writer.WriteString(encryptStr)}//处理jsonfunc parseJson(c *gin.Context, md5key string) error {//读取数据 body处理payload, err := c.GetRawData()if err != nil {return err}///解密body数据 请求的json是{"encryptString":{value}} value含有gcm的12字节nonce,实际长度大于32if payload != nil && len(payload) > 20 {var jsonData encryptJsonlog("AesGcmDecrypt parseJson url:%s md5key:%s,old data:%s,", c.Request.URL.String(), md5key, string(payload))err := json.Unmarshal(payload, &jsonData)if err != nil {log("AesGcmDecrypt parseJson Unmarshal err:%v", err)return err}payloadText := jsonData.EncryptStringif len(payloadText) > 0 {payloadText, err = aes.GcmDecrypt(md5key, payloadText)if err != nil {log("AesGcmDecrypt parseJson GcmDecryptByte err:%v", err)return err}payload = []byte(payloadText)log("AesGcmDecrypt parseJson url:%s md5key:%s,encryptString:%s,decrypt data:%s", c.Request.URL.String(), md5key, jsonData.EncryptString, payloadText)}}c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(payload))return nil}func parseForm(c *gin.Context, md5key string) error {//读取数据 body处理payload, err := c.GetRawData()if err != nil {return err}///解密body数据 请求的json是"encryptString= value含有gcm的12字节nonce,实际长度大于32if payload != nil && len(payload) > 20 {var jsonData encryptJsonlog("AesGcmDecrypt parseForm url:%s md5key:%s,old data:%s,", c.Request.URL.String(), md5key, string(payload))values, err := url.ParseQuery(string(payload))if err != nil {log("AesGcmDecrypt parseForm ParseQuery err:%v", err)return err}payloadText := values.Get("encryptString")if len(payloadText) > 0 {mapData, err := gcmDecryptString(md5key, payloadText)if err != nil {log("AesGcmDecrypt parseForm gcmDecryptString err:%v", err)return err}for k, v := range mapData {values.Add(k, getStr(v))}formData := values.Encode()log("AesGcmDecrypt parseForm url:%s md5key:%s,encryptString:%s,decrypt data:%s", c.Request.URL.String(), md5key, jsonData.EncryptString, formData)payload = []byte(formData)}}c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(payload))return nil}//处理get url的解密func parseQuery(c *gin.Context, md5Key string) error {encryptString := c.Query("encryptString")log("AesGcmDecrypt parseQuery url:%s, md5key:%s, encryptString:%s", c.Request.URL.String(), md5Key, encryptString)if len(encryptString) < 1 {return nil}queryData, err := gcmDecryptString(md5Key, encryptString)if err != nil {return err}var args []stringvar logs []stringfor k, v := range queryData {val := getStr(v)args = append(args, fmt.Sprintf("%s=%s", k, url.QueryEscape(val)))logs = append(logs, fmt.Sprintf("%s=%s", k, val))}log("AesGcmDecrypt parseQuery url:%s, md5key:%s, encryptString:%s, decrypt data:%s", c.Request.URL.String(), md5Key, encryptString, strings.Join(logs, "&"))c.Request.URL.RawQuery = strings.Join(args, "&")return nil}func parseFile(c *gin.Context, md5Key string) error {contentType := c.Request.Header.Get("Content-Type")_, params, _ := mime.ParseMediaType(contentType)boundary, ok := params["boundary"]if !ok {return errors.New("no multipart boundary param in Content-Type")}//准备重写数据bodyBuf := &bytes.Buffer{}wr := multipart.NewWriter(bodyBuf)mr := multipart.NewReader(c.Request.Body, boundary)for {p, err := mr.NextPart() //p的类型为Partif err == io.EOF {break}if err != nil {log("NextPart err:%v", err)break}fileByte, err := ioutil.ReadAll(p)if err != nil {log("ReadAll err:%v", err)break}pName := p.FormName()fileName := p.FileName()if len(fileName) < 1 {if pName == "encryptString" {formData, err := gcmDecryptString(md5Key, string(fileByte))if err != nil {log("AesGcmDecrypt writeFile gcmDecryptString err:%v", err)break}for k, v := range formData {val := getStr(v)err = wr.WriteField(k, val)if err != nil {log("AesGcmDecrypt writeFile WriteField :%s=%s, err:%v", k, val, err)break}}} else {wr.WriteField(pName, string(fileByte))}} else {tmp, err := wr.CreateFormFile(pName, fileName)if err != nil {log("AesGcmDecrypt parseFile CreateFormFile err:%v", err)continue}tmp.Write(fileByte)}}//写结尾标志_ = wr.Close()c.Request.Header.Set("Content-Type", wr.FormDataContentType())c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBuf.Bytes()))return nil}func gcmDecryptString(md5Key, encryptString string) (map[string]interface{}, error) {formData := make(map[string]interface{}, 0)if len(encryptString) < 1 {return formData, nil}plaintext, err := aes.GcmDecrypt(md5Key, encryptString)if err != nil {return formData, err}if len(plaintext) < 3 {//plaintext 应该是json 串 {}return formData, nil}err = json.Unmarshal([]byte(plaintext), &formData)if err != nil {return formData, err}return formData, nil}func isJsonResponse(c *gin.Context) bool {contentType := c.Writer.Header().Get("Content-Type")return strings.Contains(contentType, "application/json")}func getStr(v interface{}) string {val := ""switch v.(type) {case float64://tmp, _ := decimal.NewFromString(fmt.Sprintf("%.10f", v))fl, _ := v.(float64)val = strconv.FormatFloat(fl, 'f', -1, 64)default:val = fmt.Sprintf("%v", v)}return val}type encryptJson struct {EncryptString string `json:"encryptString"`}func log(format string, arg ...interface{}) {fmt.Print(fmt.Sprintf(format, arg...))}func response(c *gin.Context, code int, msg string, data interface{}) {mapData := make(map[string]interface{}, 0)mapData["code"] = codemapData["msg"] = msgmapData["data"] = datac.JSON(200, data)c.Abort()return}
最后我们来写一个demo程序main.go
package mainimport ("demo/middleware""fmt""github.com/gin-gonic/gin""os")func main() {go func() {gateway := gin.Default()gateway.Use(middleware.AesGcmDecrypt())gateway.Use(middleware.GateWay())gateway.Run(":8080")}()// 1.创建路由r := gin.Default()r.Use(middleware.Logger())r.GET("/", func(c *gin.Context) {c.Writer.WriteString("pong")})r.GET("/demo", func(c *gin.Context) {req := ReqObj{}err := c.ShouldBindQuery(&req)if err != nil {fmt.Print(err)}response(c, 200, "ok", req)})r.POST("/test", func(c *gin.Context) {req := ReqObj{}err := c.ShouldBind(&req)if err != nil {fmt.Print(err)}response(c, 200, "ok", req)})r.POST("/form", func(c *gin.Context) {req := ReqObj{}err := c.ShouldBind(&req)if err != nil {fmt.Print(err)}response(c, 200, "ok", req)})r.POST("/upload", func(c *gin.Context) {file, err := c.FormFile("file")if err != nil {fmt.Print(err)}folder := c.Request.FormValue("folder")tmp, _ := os.Getwd()filePath := tmp + "/upload/" + folder + "/" + file.Filenamec.SaveUploadedFile(file, filePath)})r.Run(":8000")}type ReqObj struct {Name string `json:"name" form:"name"`Age int64 `json:"age" form:"age"`UpdateTime int64 `json:"update_time" form:"update_time"`Folder string `json:"folder" form:"folder"`}func response(c *gin.Context, code int, msg string, data interface{}) {mapData := make(map[string]interface{}, 0)mapData["code"] = codemapData["msg"] = msgmapData["data"] = datac.JSON(200, data)c.Abort()return}
来让我们一次验证一下运行结果:
最后来看一下文件上传:
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