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package middleware
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import (
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"bytes"
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"context"
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"crypto/md5"
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"fmt"
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"io/ioutil"
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"net/http"
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model "github.com/cloudreve/Cloudreve/v3/models"
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"github.com/cloudreve/Cloudreve/v3/pkg/auth"
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"github.com/cloudreve/Cloudreve/v3/pkg/cache"
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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/driver/onedrive"
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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/driver/oss"
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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/driver/upyun"
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"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
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"github.com/cloudreve/Cloudreve/v3/pkg/util"
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"github.com/gin-contrib/sessions"
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"github.com/gin-gonic/gin"
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"github.com/qiniu/api.v7/v7/auth/qbox"
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)
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// SignRequired 验证请求签名
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func SignRequired() gin.HandlerFunc {
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return func(c *gin.Context) {
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var err error
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switch c.Request.Method {
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case "PUT", "POST":
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err = auth.CheckRequest(auth.General, c.Request)
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// TODO 生产环境去掉下一行
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//err = nil
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default:
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err = auth.CheckURI(auth.General, c.Request.URL)
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}
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if err != nil {
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c.JSON(200, serializer.Err(serializer.CodeCredentialInvalid, err.Error(), err))
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// CurrentUser 获取登录用户
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func CurrentUser() gin.HandlerFunc {
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return func(c *gin.Context) {
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session := sessions.Default(c)
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uid := session.Get("user_id")
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if uid != nil {
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user, err := model.GetActiveUserByID(uid)
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if err == nil {
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c.Set("user", &user)
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}
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}
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c.Next()
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}
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}
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// AuthRequired 需要登录
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func AuthRequired() gin.HandlerFunc {
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return func(c *gin.Context) {
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if user, _ := c.Get("user"); user != nil {
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if _, ok := user.(*model.User); ok {
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c.Next()
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return
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}
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}
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c.JSON(200, serializer.CheckLogin())
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c.Abort()
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}
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}
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// WebDAVAuth 验证WebDAV登录及权限
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func WebDAVAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// OPTIONS 请求不需要鉴权，否则Windows10下无法保存文档
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if c.Request.Method == "OPTIONS" {
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c.Next()
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return
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}
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username, password, ok := c.Request.BasicAuth()
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if !ok {
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c.Writer.Header()["WWW-Authenticate"] = []string{`Basic realm="cloudreve"`}
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c.Status(http.StatusUnauthorized)
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c.Abort()
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return
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}
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expectedUser, err := model.GetUserByEmail(username)
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if err != nil {
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c.Status(http.StatusUnauthorized)
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c.Abort()
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return
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}
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// 密码正确？
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webdav, err := model.GetWebdavByPassword(password, expectedUser.ID)
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if err != nil {
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c.Status(http.StatusUnauthorized)
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c.Abort()
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return
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}
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// 用户组已启用WebDAV？
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if !expectedUser.Group.WebDAVEnabled {
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c.Status(http.StatusForbidden)
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c.Abort()
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return
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}
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c.Set("user", &expectedUser)
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c.Set("webdav", webdav)
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c.Next()
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}
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}
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// uploadCallbackCheck 对上传回调请求的 callback key 进行验证，如果成功则返回上传用户
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func uploadCallbackCheck(c *gin.Context) (serializer.Response, *model.User) {
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// 验证 Callback Key
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callbackKey := c.Param("key")
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if callbackKey == "" {
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return serializer.ParamErr("Callback Key 不能为空", nil), nil
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}
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callbackSessionRaw, exist := cache.Get("callback_" + callbackKey)
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if !exist {
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return serializer.ParamErr("回调会话不存在或已过期", nil), nil
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}
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callbackSession := callbackSessionRaw.(serializer.UploadSession)
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c.Set("callbackSession", &callbackSession)
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// 清理回调会话
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_ = cache.Deletes([]string{callbackKey}, "callback_")
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// 查找用户
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user, err := model.GetActiveUserByID(callbackSession.UID)
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if err != nil {
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return serializer.Err(serializer.CodeCheckLogin, "找不到用户", err), nil
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}
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c.Set("user", &user)
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return serializer.Response{}, &user
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}
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// RemoteCallbackAuth 远程回调签名验证
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func RemoteCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, user := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(200, resp)
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c.Abort()
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return
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}
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// 验证签名
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authInstance := auth.HMACAuth{SecretKey: []byte(user.Policy.SecretKey)}
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if err := auth.CheckRequest(authInstance, c.Request); err != nil {
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c.JSON(200, serializer.Err(serializer.CodeCheckLogin, err.Error(), err))
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// QiniuCallbackAuth 七牛回调签名验证
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func QiniuCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, user := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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// 验证回调是否来自qiniu
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mac := qbox.NewMac(user.Policy.AccessKey, user.Policy.SecretKey)
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ok, err := mac.VerifyCallback(c.Request)
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if err != nil {
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util.Log().Debug("无法验证回调请求，%s", err)
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "无法验证回调请求"})
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c.Abort()
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return
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}
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if !ok {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "回调签名无效"})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// OSSCallbackAuth 阿里云OSS回调签名验证
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func OSSCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, _ := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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err := oss.VerifyCallbackSignature(c.Request)
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if err != nil {
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util.Log().Debug("回调签名验证失败，%s", err)
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "回调签名验证失败"})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// UpyunCallbackAuth 又拍云回调签名验证
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func UpyunCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, user := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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// 获取请求正文
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body, err := ioutil.ReadAll(c.Request.Body)
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c.Request.Body.Close()
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if err != nil {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: err.Error()})
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c.Abort()
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return
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}
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c.Request.Body = ioutil.NopCloser(bytes.NewReader(body))
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// 准备验证Upyun回调签名
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handler := upyun.Driver{Policy: &user.Policy}
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contentMD5 := c.Request.Header.Get("Content-Md5")
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date := c.Request.Header.Get("Date")
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actualSignature := c.Request.Header.Get("Authorization")
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// 计算正文MD5
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actualContentMD5 := fmt.Sprintf("%x", md5.Sum(body))
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if actualContentMD5 != contentMD5 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "MD5不一致"})
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c.Abort()
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return
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}
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// 计算理论签名
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signature := handler.Sign(context.Background(), []string{
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"POST",
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c.Request.URL.Path,
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date,
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contentMD5,
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})
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// 对比签名
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if signature != actualSignature {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "鉴权失败"})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// OneDriveCallbackAuth OneDrive回调签名验证
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// TODO 解耦
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func OneDriveCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, _ := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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// 发送回调结束信号
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onedrive.FinishCallback(c.Param("key"))
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c.Next()
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}
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}
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// COSCallbackAuth 腾讯云COS回调签名验证
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// TODO 解耦 测试
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func COSCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, _ := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// S3CallbackAuth Amazon S3回调签名验证
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func S3CallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 验证key并查找用户
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resp, _ := uploadCallbackCheck(c)
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if resp.Code != 0 {
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: resp.Msg})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// IsAdmin 必须为管理员用户组
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func IsAdmin() gin.HandlerFunc {
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return func(c *gin.Context) {
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user, _ := c.Get("user")
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if user.(*model.User).Group.ID != 1 && user.(*model.User).ID != 1 {
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c.JSON(200, serializer.Err(serializer.CodeAdminRequired, "您不是管理组成员", nil))
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c.Abort()
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return
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}
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c.Next()
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}
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}
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