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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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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem"
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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/mq"
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"github.com/cloudreve/Cloudreve/v3/pkg/util"
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"github.com/qiniu/go-sdk/v7/auth/qbox"
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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/serializer"
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"github.com/gin-contrib/sessions"
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"github.com/gin-gonic/gin"
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)
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const (
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CallbackFailedStatusCode = http.StatusUnauthorized
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)
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// SignRequired 验证请求签名
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func SignRequired(authInstance auth.Auth) 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", "PATCH":
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err = auth.CheckRequest(authInstance, c.Request)
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default:
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err = auth.CheckURI(authInstance, 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.GetActiveUserByEmail(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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// 对上传会话进行验证
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func UseUploadSession(policyType string) 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, policyType)
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if resp.Code != 0 {
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c.JSON(CallbackFailedStatusCode, resp)
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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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// 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, policyType string) serializer.Response {
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// 验证 Callback Key
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sessionID := c.Param("sessionID")
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if sessionID == "" {
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return serializer.ParamErr("Session ID cannot be empty", nil)
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}
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callbackSessionRaw, exist := cache.Get(filesystem.UploadSessionCachePrefix + sessionID)
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if !exist {
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return serializer.Err(serializer.CodeUploadSessionExpired, "上传会话不存在或已过期", nil)
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}
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callbackSession := callbackSessionRaw.(serializer.UploadSession)
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c.Set(filesystem.UploadSessionCtx, &callbackSession)
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if callbackSession.Policy.Type != policyType {
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return serializer.Err(serializer.CodePolicyNotAllowed, "", nil)
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}
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// 清理回调会话
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_ = cache.Deletes([]string{sessionID}, filesystem.UploadSessionCachePrefix)
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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.CodeUserNotFound, "", err)
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}
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c.Set(filesystem.UserCtx, &user)
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return serializer.Response{}
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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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// 验证签名
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session := c.MustGet(filesystem.UploadSessionCtx).(*serializer.UploadSession)
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authInstance := auth.HMACAuth{SecretKey: []byte(session.Policy.SecretKey)}
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if err := auth.CheckRequest(authInstance, c.Request); err != nil {
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c.JSON(CallbackFailedStatusCode, 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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// 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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session := c.MustGet(filesystem.UploadSessionCtx).(*serializer.UploadSession)
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// 验证回调是否来自qiniu
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mac := qbox.NewMac(session.Policy.AccessKey, session.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("Failed to verify callback request: %s", err)
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "Failed to verify callback request."})
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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: "Invalid signature."})
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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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err := oss.VerifyCallbackSignature(c.Request)
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if err != nil {
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util.Log().Debug("Failed to verify callback request: %s", err)
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c.JSON(401, serializer.GeneralUploadCallbackFailed{Error: "Failed to verify callback request."})
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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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session := c.MustGet(filesystem.UploadSessionCtx).(*serializer.UploadSession)
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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: &session.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 mismatch."})
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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: "Signature not match"})
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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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func OneDriveCallbackAuth() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 发送回调结束信号
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mq.GlobalMQ.Publish(c.Param("sessionID"), mq.Message{})
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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.CodeNoPermissionErr, "", 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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