Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

service/explorer/entity.go

@@ -0,0 +1,118 @@
+package explorer
+
+import (
+	"fmt"
+	"github.com/cloudreve/Cloudreve/v4/application/dependency"
+	"github.com/cloudreve/Cloudreve/v4/inventory"
+	"github.com/cloudreve/Cloudreve/v4/pkg/cluster/routes"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/fs"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/manager"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/manager/entitysource"
+	"github.com/cloudreve/Cloudreve/v4/pkg/hashid"
+	"github.com/cloudreve/Cloudreve/v4/pkg/serializer"
+	"github.com/gin-gonic/gin"
+)
+
+type (
+	EntityDownloadParameterCtx struct{}
+	EntityDownloadService      struct {
+		Name       string `uri:"name" binding:"required"`
+		SpeedLimit int64  `uri:"speed"`
+		Src        string `uri:"src"`
+	}
+)
+
+// Serve serves file content
+func (s *EntityDownloadService) Serve(c *gin.Context) error {
+	dep := dependency.FromContext(c)
+	user := inventory.UserFromContext(c)
+	m := manager.NewFileManager(dep, user)
+	defer m.Recycle()
+
+	entitySource, err := m.GetEntitySource(c, hashid.FromContext(c))
+	if err != nil {
+		return fmt.Errorf("failed to get entity source: %w", err)
+	}
+
+	defer entitySource.Close()
+
+	// Set cache header for public resource
+	settings := dep.SettingProvider()
+	maxAge := settings.PublicResourceMaxAge(c)
+	c.Header("Cache-Control", fmt.Sprintf("public, max-age=%d", maxAge))
+
+	isDownload := c.Query(routes.IsDownloadQuery) != ""
+	isThumb := c.Query(routes.IsThumbQuery) != ""
+	entitySource.Serve(c.Writer, c.Request,
+		entitysource.WithSpeedLimit(s.SpeedLimit),
+		entitysource.WithDownload(isDownload),
+		entitysource.WithDisplayName(s.Name),
+		entitysource.WithContext(c),
+		entitysource.WithThumb(isThumb),
+	)
+	return nil
+}
+
+type (
+	SetCurrentVersionParamCtx struct{}
+	SetCurrentVersionService  struct {
+		Uri     string `uri:"uri" binding:"required"`
+		Version string `uri:"version" binding:"required"`
+	}
+)
+
+// Set sets the current version of the file
+func (s *SetCurrentVersionService) Set(c *gin.Context) error {
+	dep := dependency.FromContext(c)
+	user := inventory.UserFromContext(c)
+	m := manager.NewFileManager(dep, user)
+	defer m.Recycle()
+
+	uri, err := fs.NewUriFromString(s.Uri)
+	if err != nil {
+		return serializer.NewError(serializer.CodeParamErr, "unknown uri", err)
+	}
+
+	versionId, err := dep.HashIDEncoder().Decode(s.Version, hashid.EntityID)
+	if err != nil {
+		return serializer.NewError(serializer.CodeParamErr, "unknown version id", err)
+	}
+
+	if err := m.SetCurrentVersion(c, uri, versionId); err != nil {
+		return fmt.Errorf("failed to set current version: %w", err)
+	}
+
+	return nil
+}
+
+type (
+	DeleteVersionParamCtx struct{}
+	DeleteVersionService  struct {
+		Uri     string `uri:"uri" binding:"required"`
+		Version string `uri:"version" binding:"required"`
+	}
+)
+
+// Delete deletes the version of the file
+func (s *DeleteVersionService) Delete(c *gin.Context) error {
+	dep := dependency.FromContext(c)
+	user := inventory.UserFromContext(c)
+	m := manager.NewFileManager(dep, user)
+	defer m.Recycle()
+
+	uri, err := fs.NewUriFromString(s.Uri)
+	if err != nil {
+		return serializer.NewError(serializer.CodeParamErr, "unknown uri", err)
+	}
+
+	versionId, err := dep.HashIDEncoder().Decode(s.Version, hashid.EntityID)
+	if err != nil {
+		return serializer.NewError(serializer.CodeParamErr, "unknown version id", err)
+	}
+
+	if err := m.DeleteVersion(c, uri, versionId); err != nil {
+		return fmt.Errorf("failed to delete version: %w", err)
+	}
+
+	return nil
+}