For accessibility purposes when linking to a media item (say PDF) in the rich text editor I developed a way (in controllers.js) of appending the file extension and size attributes to the link text.

The controller is Umbraco.Editors.LinkPickerController. Here is my Umbraco 7 code block

       $scope.switchToMediaPicker = function () {
        userService.getCurrentUser().then(function (userData) {
            $scope.mediaPickerOverlay = {
                view: 'mediapicker',
                startNodeId: userData.startMediaIds.length !== 1 ? -1 : userData.startMediaIds[0],
                startNodeIsVirtual: userData.startMediaIds.length !== 1,
                show: true,
                submit: function (model) {
                    var media = model.selectedImages[0];
                    $scope.model.target.id = media.id;
                    $scope.model.target.udi = media.udi;
                    $scope.model.target.isMedia = true;
                    //derive file name, extension and size in KB and set to target.name
                    var filename, fileext, sizeKBytes
                    angular.forEach(media.properties, function (property) {
                        if (property.alias === "umbracoExtension") {
                            fileext = " [" + property.value + "] ";
                            if (media.name.endsWith("." + property.value)) {
                                filename = media.name.substring(0, media.name.length - (property.value.length + 1));
                            }
                            else {
                                filename = media.name;
                            }
                        }
                        else if (property.alias === "umbracoBytes") {
                            sizeKBytes = parseInt(property.value / 1024) + "KB";
                        }
                    });
                    $scope.model.target.name = filename + fileext + sizeKBytes;
                    $scope.model.target.url = mediaHelper.resolveFile(media);
                    $scope.mediaPickerOverlay.show = false;
                    $scope.mediaPickerOverlay = null;
                }
            };
        });
    };

In Umbraco 8 there is no media.properties collection available.

There are no services injected which seem to allow me to access media entity properties.

Please advise how I would get the umbracoBytes value of a selected media item in Umbraco 8.