Disallow empty annotation layer names and names starting with a '.'

CHANGELOG.unreleased.md

@@ -24,6 +24,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 ### Fixed
 - Fix performance bottleneck when deleting a lot of trees at once. [#8176](https://github.com/scalableminds/webknossos/pull/8176)
 - Fix a bug where changing the color of a segment via the menu in the segments tab would update the segment color of the previous segment, on which the context menu was opened. [#8225](https://github.com/scalableminds/webknossos/pull/8225)
+- Fix that the frontend did not ensure a minium length for annotation layer names. Moreover, names starting with a `.` are also disallowed now. [#8244](https://github.com/scalableminds/webknossos/pull/8244)
 - Fix a bug when importing an NML with groups when only groups but no trees exist in an annotation. [#8176](https://github.com/scalableminds/webknossos/pull/8176)
 - Fix a bug where trying to delete a non-existing node (via the API, for example) would delete the whole active tree. [#8176](https://github.com/scalableminds/webknossos/pull/8176)
 - Fix a bug where dataset uploads would fail if the organization directory on disk is missing. [#8230](https://github.com/scalableminds/webknossos/pull/8230)

frontend/javascripts/messages.tsx

@@ -212,6 +212,8 @@ instead. Only enable this option if you understand its effect. All layers will n
     } "${disallowedCharacters}". Please remove ${
       disallowedCharacters.length > 1 ? "them" : "it"
     } to set the layer name.`,
+  "tracing.volume_layer_name_too_short": "The layer name must be at least one character long.",
+  "tracing.volume_layer_name_starts_with_dot": "The layer name must not start with a dot.",
   "tracing.delete_initial_node": "Do you really want to delete the initial node?",
   "tracing.delete_tree": "Do you really want to delete the whole tree?",
   "tracing.delete_tree_with_initial_node":

frontend/javascripts/oxalis/view/components/editable_text_label.tsx

@@ -10,6 +10,7 @@ import FastTooltip from "components/fast_tooltip";
 type Rule = {
   message?: string;
   type?: string;
+  min?: number;
   validator?: (arg0: string) => ValidationResult;
 };
 export type EditableTextLabelProp = {
@@ -118,6 +119,11 @@ class EditableTextLabel extends React.PureComponent<EditableTextLabelProp, State
           Toast.error(validationResult.message);
           return false;
         }
+      } else if (rule.min != null) {
+        if (this.state.value.length < rule.min) {
+          Toast.error(`Length must at least be ${rule.min}.`);
+          return false;
+        }
       }
       return true;
     });

frontend/javascripts/oxalis/view/left-border-tabs/modals/add_volume_layer_modal.tsx

@@ -41,6 +41,13 @@ export function checkForLayerNameDuplication(
 }
 
 export function checkLayerNameForInvalidCharacters(readableLayerName: string): ValidationResult {
+  // A layer name is not allowed to start with a dot.
+  if (readableLayerName.startsWith(".")) {
+    return {
+      isValid: false,
+      message: messages["tracing.volume_layer_name_starts_with_dot"],
+    };
+  }
   const uriSafeCharactersRegex = /[0-9a-zA-Z-._]+/g;
   // Removing all URISaveCharacters from readableLayerName. The leftover chars are all invalid.
   const allInvalidChars = readableLayerName.replace(uriSafeCharactersRegex, "");
@@ -62,6 +69,12 @@ export function validateReadableLayerName(
   allReadableLayerNames: string[],
   nameNotToCount?: string,
 ): ValidationResult {
+  if (readableLayerName.length < 1) {
+    return {
+      isValid: false,
+      message: messages["tracing.volume_layer_name_too_short"],
+    };
+  }
   if (nameNotToCount) {
     // nameNotToCount needs to be removed once if it is included in allReadableLayerNames.
     // This is needed in case of saving an existing volume layer's name when the name was not modified.