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這篇文章主要介紹“go GCM gin中間件怎么加密解密文件”的相關(guān)知識(shí)，小編通過實(shí)際案例向大家展示操作過程，操作方法簡單快捷，實(shí)用性強(qiáng)，希望這篇“go GCM gin中間件怎么加密解密文件”文章能幫助大家解決問題。
要給已有的系統(tǒng)啟用加密解密，目前推薦的是aes的gcm模式的加密和解密，在微服務(wù)如果向前有公共方法處理 讀取數(shù)據(jù)和寫返回?cái)?shù)據(jù)，那么比較簡單，修改以前的公共方法，但是這樣本地調(diào)試平時(shí)肯定是明文，所以要加判斷，如果以前的讀數(shù)據(jù)和寫數(shù)據(jù)是五花八門那就比較麻煩，在微服務(wù)體系里面一般有網(wǎng)關(guān)這個(gè)服務(wù)，所以加密和解密就放在網(wǎng)關(guān)服務(wù)，大致如下：
常規(guī)的請(qǐng)求有GET，POST JSON， POST file,以及POST Form表單，返回一般是json 或者下載文件流，所以我們需要截獲請(qǐng)求流和返回流，收到請(qǐng)求流解密數(shù)據(jù) 然后重新寫入到請(qǐng)求流，收到返回流加密數(shù)據(jù)，重寫返回流。
首先來看aes加密和解密程序aes.go
package aes
import (
"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))
}再來看看網(wǎng)關(guān)轉(zhuǎn)發(fā)程序proxy.go
package middleware
import (
"fmt"
"github.com/gin-gonic/gin"
"github.com/valyala/fasthttp"
"io/ioutil"
"runtime/debug"
"time"
)
var fastClient *fasthttp.Client
func init() {
fastClient = &fasthttp.Client{}
fastClient.MaxIdemponentCallAttempts = 1
fastClient.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, "系統(tǒng)錯(cuò)誤", err.Error())
}
return
}
}
func Forward(ctx *gin.Context) error {
req := &fasthttp.Request{}
//請(qǐng)求-獲取服務(wù)地址
host := "http://localhost:8000/" + ctx.Request.URL.String()
//請(qǐng)求-url
req.SetRequestURI(host)
//請(qǐng)求-header
for k, v := range ctx.Request.Header {
req.Header.Set(k, v[0])
}
//請(qǐng)求-body
data, err := ioutil.ReadAll(ctx.Request.Body)
if err != nil {
log("Forward err:%v", err)
return fmt.Errorf("系統(tǒng)錯(cuò)誤")
}
req.SetBody(data)
//請(qǐng)求-方法
req.Header.SetMethod(ctx.Request.Method)
//請(qǐng)求-發(fā)送
resp := &fasthttp.Response{}
//請(qǐng)求-新增調(diào)用鏈
/*
err = opentracing.GlobalTracer().Inject(
opentracing.SpanFromContext(ctx.Request.Context()).Context(),
opentracing.TextMap,
HTTPHeadersCarrier{&req.Header},
)
*/
err = GetHttpClient().Do(req, resp)
if err != nil {
log("Forward GetHttpClient DO err:%v", err)
return fmt.Errorf("系統(tǒng)錯(cuò)誤")
}
//請(qǐng)求-響應(yīng)
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.RequestHeader
h.Add(key, val)
}最后來看一下gin的中間件crypto.go
package middleware
import (
"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.ResponseWriter
body *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)
}
//只有經(jīng)過token 驗(yàn)證的才會(huì)加密 和解密
//handleFile 表示是否處理上傳文件， 默認(rèn)網(wǎng)關(guān)不處理上傳文件的encryptString數(shù)據(jù)， 如果處理會(huì)導(dǎo)致具體服務(wù)無法接收到具體參數(shù)
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)
}
}
}
//請(qǐng)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)
//這里輸出應(yīng)該密文 一旦加密解密調(diào)試好 這里就不會(huì)走進(jìn)來
response(c, 2001, "系統(tǒng)錯(cuò)誤", err.Error())
return
}
} else if isJsonRequest {
err := parseJson(c, md5key)
if err != nil {
log("handleAes parseJson err:%v", err)
//這里輸出應(yīng)該密文 一旦加密解密調(diào)試好 這里就不會(huì)走進(jìn)來
response(c, 2001, "系統(tǒng)錯(cuò)誤", err.Error())
return
}
} else if isFormUrl {
err := parseForm(c, md5key)
if err != nil {
log("handleAes parseForm err:%v", err)
//這里輸出應(yīng)該密文 一旦加密解密調(diào)試好 這里就不會(huì)走進(jìn)來
response(c, 2001, "系統(tǒng)錯(cuò)誤", err.Error())
return
}
} else if isFileRequest {
err := parseFile(c, md5key)
if err != nil {
log("handleAes parseFile err:%v", err)
//這里輸出應(yīng)該密文 一旦加密解密調(diào)試好 這里就不會(huì)走進(jìn)來
response(c, 2001, "系統(tǒng)錯(cuò)誤", err.Error())
return
}
}
///截取 response body
oldWriter := c.Writer
blw := &aesWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
c.Writer = blw
// 走流程
c.Next()
///獲取返回?cái)?shù)據(jù)
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,應(yīng)為文件下載之類的不應(yīng)該加密
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, "系統(tǒng)錯(cuò)誤", err.Error())
return
}
_, _ = c.Writer.WriteString(encryptStr)
}
//處理json
func parseJson(c *gin.Context, md5key string) error {
//讀取數(shù)據(jù) body處理
payload, err := c.GetRawData()
if err != nil {
return err
}
///解密body數(shù)據(jù) 請(qǐng)求的json是{"encryptString":{value}} value含有g(shù)cm的12字節(jié)nonce,實(shí)際長度大于32
if payload != nil && len(payload) > 20 {
var jsonData encryptJson
log("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.EncryptString
if 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 {
//讀取數(shù)據(jù) body處理
payload, err := c.GetRawData()
if err != nil {
return err
}
///解密body數(shù)據(jù) 請(qǐng)求的json是"encryptString= value含有g(shù)cm的12字節(jié)nonce,實(shí)際長度大于32
if payload != nil && len(payload) > 20 {
var jsonData encryptJson
log("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
}
//處理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 []string
var logs []string
for 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")
}
//準(zhǔn)備重寫數(shù)據(jù)
bodyBuf := &bytes.Buffer{}
wr := multipart.NewWriter(bodyBuf)
mr := multipart.NewReader(c.Request.Body, boundary)
for {
p, err := mr.NextPart() //p的類型為Part
if 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)
}
}
//寫結(jié)尾標(biāo)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 應(yīng)該是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"] = code
mapData["msg"] = msg
mapData["data"] = data
c.JSON(200, data)
c.Abort()
return
}最后我們來寫一個(gè)demo程序main.go
package main
import (
"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.創(chuàng)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.Filename
c.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"] = code
mapData["msg"] = msg
mapData["data"] = data
c.JSON(200, data)
c.Abort()
return
}來讓我們一次驗(yàn)證一下運(yùn)行結(jié)果：
最后來看一下文件上傳：
關(guān)于“go GCM gin中間件怎么加密解密文件”的內(nèi)容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識(shí)，可以關(guān)注億速云行業(yè)資訊頻道，小編每天都會(huì)為大家更新不同的知識(shí)點(diǎn)。
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