Add 'webdav/' from commit '0d5eded8d0068b8df984b3d4c44a66f10c97cf77'

git-subtree-dir: webdav
git-subtree-mainline: 7ffaa859b3
git-subtree-split: 0d5eded8d0

webdav/pkg/dav/thumbnails/thumbnail.go

@@ -0,0 +1,72 @@
+package thumbnail
+
+import (
+	"fmt"
+	"net/http"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/go-chi/chi"
+)
+
+const (
+	// DefaultWidth defines the default width of a thumbnail
+	DefaultWidth = 32
+	// DefaultHeight defines the default height of a thumbnail
+	DefaultHeight = 32
+)
+
+// Request combines all parameters provided when requesting a thumbnail
+type Request struct {
+	Filepath      string
+	Filetype      string
+	Etag          string
+	Width         int
+	Height        int
+	Authorization string
+}
+
+// NewRequest extracts all required parameters from a http request.
+func NewRequest(r *http.Request) (Request, error) {
+	path := extractFilePath(r)
+	query := r.URL.Query()
+	width, err := strconv.Atoi(query.Get("x"))
+	if err != nil {
+		width = DefaultWidth
+	}
+	height, err := strconv.Atoi(query.Get("y"))
+	if err != nil {
+		height = DefaultHeight
+	}
+
+	etag := query.Get("c")
+	if strings.TrimSpace(etag) == "" {
+		return Request{}, fmt.Errorf("c (etag) is missing in query")
+	}
+
+	authorization := r.Header.Get("Authorization")
+
+	tr := Request{
+		Filepath:      path,
+		Filetype:      strings.Replace(filepath.Ext(path), ".", "", 1),
+		Etag:          etag,
+		Width:         width,
+		Height:        height,
+		Authorization: authorization,
+	}
+
+	return tr, nil
+}
+
+// the url looks as followed
+//
+// /remote.php/dav/files/<user>/<filepath>
+//
+// User and filepath are dynamic and filepath can contain slashes
+// So using the URLParam function is not possible.
+func extractFilePath(r *http.Request) string {
+	user := chi.URLParam(r, "user")
+	parts := strings.SplitN(r.URL.Path, user, 2)
+	return parts[1]
+}