Initial QSfera import

Server/services/webdav/pkg/dav/requests/thumbnail.go

@@ -0,0 +1,106 @@
+package requests
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"path/filepath"
+	"strconv"
+
+	providerv1beta1 "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+	"github.com/go-chi/chi/v5"
+	"github.com/opencloud-eu/reva/v2/pkg/storagespace"
+	"github.com/opencloud-eu/reva/v2/pkg/utils"
+
+	"github.com/qsfera/server/services/webdav/pkg/constants"
+)
+
+const (
+	// DefaultWidth defines the default width of a thumbnail
+	DefaultWidth = 32
+	// DefaultHeight defines the default height of a thumbnail
+	DefaultHeight = 32
+)
+
+// ThumbnailRequest combines all parameters provided when requesting a thumbnail
+type ThumbnailRequest struct {
+	// The file path of the source file
+	Filepath string
+	// The file name of the source file including the extension
+	Filename string
+	// The file extension
+	Extension string
+	// The requested width of the thumbnail
+	Width int32
+	// The requested height of the thumbnail
+	Height int32
+	// In case of a public share the public link token.
+	PublicLinkToken string
+	// Indicates which image processor to use
+	Processor string
+	// The Identifier from the requested URL
+	Identifier string
+}
+
+func addMissingStorageID(id string) string {
+	rid := &providerv1beta1.ResourceId{}
+	rid.StorageId, rid.SpaceId, rid.OpaqueId, _ = storagespace.SplitID(id)
+	if rid.StorageId == "" && rid.SpaceId == utils.ShareStorageSpaceID {
+		rid.StorageId = utils.ShareStorageProviderID
+	}
+	return storagespace.FormatResourceID(rid)
+}
+
+// ParseThumbnailRequest extracts all required parameters from a http request.
+func ParseThumbnailRequest(r *http.Request) (*ThumbnailRequest, error) {
+	ctx := r.Context()
+
+	fp := ctx.Value(constants.ContextKeyPath).(string)
+
+	id := ""
+	v := ctx.Value(constants.ContextKeyID)
+	if v != nil {
+		id = addMissingStorageID(v.(string))
+	}
+
+	q := r.URL.Query()
+	width, height, err := parseDimensions(q)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ThumbnailRequest{
+		Filepath:        fp,
+		Filename:        filepath.Base(fp),
+		Extension:       filepath.Ext(fp),
+		Width:           int32(width),
+		Height:          int32(height),
+		Processor:       q.Get("processor"),
+		PublicLinkToken: chi.URLParam(r, "token"),
+		Identifier:      id,
+	}, nil
+}
+
+func parseDimensions(q url.Values) (int64, int64, error) {
+	width, err := parseDimension(q.Get("x"), "width", DefaultWidth)
+	if err != nil {
+		return 0, 0, err
+	}
+	height, err := parseDimension(q.Get("y"), "height", DefaultHeight)
+	if err != nil {
+		return 0, 0, err
+	}
+	return width, height, nil
+}
+
+func parseDimension(d, name string, defaultValue int64) (int64, error) {
+	if d == "" {
+		return defaultValue, nil
+	}
+	result, err := strconv.ParseInt(d, 10, 32)
+	if err != nil || result < 1 {
+		// The error message doesn't fit but for OC10 API compatibility reasons we have to set this.
+		return 0, fmt.Errorf("Cannot set %s of 0 or smaller!", name)
+	}
+	return result, nil
+}