Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

middleware/file.go

@@ -1,30 +1,49 @@
 package middleware
 
 import (
-	model "github.com/cloudreve/Cloudreve/v3/models"
-	"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
+	"fmt"
+	"github.com/cloudreve/Cloudreve/v4/application/dependency"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/fs/dbfs"
+	"github.com/cloudreve/Cloudreve/v4/pkg/serializer"
+	"github.com/cloudreve/Cloudreve/v4/pkg/util"
+	"github.com/cloudreve/Cloudreve/v4/routers/controllers"
 	"github.com/gin-gonic/gin"
+	"github.com/gofrs/uuid"
 )
 
-// ValidateSourceLink validates if the perm source link is a valid redirect link
-func ValidateSourceLink() gin.HandlerFunc {
+// UrisService is a wrapper for service supports batch file operations
+type UrisService interface {
+	GetUris() []string
+}
+
+// ValidateBatchFileCount validates if the batch file count is within the limit
+func ValidateBatchFileCount(dep dependency.Dep, ctxKey interface{}) gin.HandlerFunc {
+	settings := dep.SettingProvider()
 	return func(c *gin.Context) {
-		linkID, ok := c.Get("object_id")
-		if !ok {
-			c.JSON(200, serializer.Err(serializer.CodeFileNotFound, "", nil))
+		uris := controllers.ParametersFromContext[UrisService](c, ctxKey)
+		limit := settings.MaxBatchedFile(c)
+		if len((uris).GetUris()) > limit {
+			c.JSON(200, serializer.ErrWithDetails(
+				c,
+				serializer.CodeTooManyUris,
+				fmt.Sprintf("Maximum allowed batch size: %d", limit),
+				nil,
+			))
 			c.Abort()
 			return
 		}
 
-		sourceLink, err := model.GetSourceLinkByID(linkID)
-		if err != nil || sourceLink.File.ID == 0 || sourceLink.File.Name != c.Param("name") {
-			c.JSON(200, serializer.Err(serializer.CodeFileNotFound, "", nil))
-			c.Abort()
-			return
-		}
-
-		sourceLink.Downloaded()
-		c.Set("source_link", sourceLink)
+		c.Next()
+	}
+}
+
+// ContextHint parses the context hint header and set it to context
+func ContextHint() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.GetHeader(dbfs.ContextHintHeader) != "" {
+			util.WithValue(c, dbfs.ContextHintCtxKey{}, uuid.FromStringOrNil(c.GetHeader(dbfs.ContextHintHeader)))
+		}
+
 		c.Next()
 	}
 }