Add utilIsColorValid to check whether a color can be shown

re: #1219
re: openstreetmap/iD#9424

modules/ui/feature_list.js

@@ -7,7 +7,7 @@ import { osmEntity } from '../osm/entity';
 import { uiIcon } from './icon';
 import { uiCmd } from './cmd';
 
-import { utilHighlightEntities, utilNoAuto } from '../util';
+import { utilHighlightEntities, utilIsColorValid, utilNoAuto } from '../util';
 
 
 export function uiFeatureList(context) {
@@ -303,8 +303,8 @@ export function uiFeatureList(context) {
       label
         .append('span')
         .attr('class', 'entity-name')
-        .classed('has-color', d => d.entity && d.entity.type === 'relation' && d.entity.tags.colour)
-        .style('border-color', d => d.entity && d.entity.type === 'relation' && d.entity.tags.colour)
+        .classed('has-color', d => !!_getColor(d.entity))
+        .style('border-color', d => _getColor(d.entity))
         .text(d => d.name);
 
       enter
@@ -319,6 +319,12 @@ export function uiFeatureList(context) {
     }
 
 
+    function _getColor(entity) {
+      const val = entity?.type === 'relation' && entity?.tags.colour;
+      return (val && utilIsColorValid(val)) ? val : null;
+    }
+
+
     function mouseover(d3_event, d) {
       if (!d.id || d.id === -1) return;
       utilHighlightEntities([d.id], true, context);

modules/ui/sections/raw_member_editor.js

@@ -10,7 +10,7 @@ import { osmEntity } from '../../osm';
 import { uiIcon } from '../icon';
 import { uiCombobox } from '../combobox';
 import { uiSection } from '../section';
-import { utilHighlightEntities, utilNoAuto } from '../../util';
+import { utilHighlightEntities, utilIsColorValid, utilNoAuto } from '../../util';
 
 const MAX_MEMBERS = 1000;
 
@@ -194,8 +194,8 @@ export function uiSectionRawMemberEditor(context) {
           labelLink
             .append('span')
             .attr('class', 'member-entity-name')
-            .classed('has-color', d => d.member.type === 'relation' && d.member.tags.colour)
-            .style('border-color', d => d.member.type === 'relation' && d.member.tags.colour)
+            .classed('has-color', d => !!_getColor(d.member))
+            .style('border-color', d => _getColor(d.member))
             .text(d => (d.member ? l10n.displayName(d.member.tags) : ''));
 
           label
@@ -335,6 +335,12 @@ export function uiSectionRawMemberEditor(context) {
   };
 
 
+  function _getColor(entity) {
+    const val = entity?.type === 'relation' && entity?.tags.colour;
+    return (val && utilIsColorValid(val)) ? val : null;
+  }
+
+
   function _bindCombo(d, i, nodes) {
     let row = d3_select(nodes[i]);
     let role = row.selectAll('input.member-role');

modules/ui/sections/raw_membership_editor.js

@@ -10,7 +10,7 @@ import { uiIcon } from '../icon';
 import { uiCombobox } from '../combobox';
 import { uiSection } from '../section';
 import { uiTooltip } from '../tooltip';
-import { utilNoAuto, utilHighlightEntities } from '../../util';
+import { utilNoAuto, utilIsColorValid, utilHighlightEntities } from '../../util';
 
 const MAX_MEMBERSHIPS = 1000;
 
@@ -134,6 +134,12 @@ export function uiSectionRawMembershipEditor(context) {
     }
 
 
+    function _getColor(entity) {
+      const val = entity?.type === 'relation' && entity?.tags.colour;
+      return (val && utilIsColorValid(val)) ? val : null;
+    }
+
+
     function changeRole(d3_event, d) {
         if (d === 0) return;    // called on newrow (shouldn't happen)
         if (_inChange) return;  // avoid accidental recursive call iD#5731
@@ -245,15 +251,16 @@ export function uiSectionRawMembershipEditor(context) {
             var matched = presets.match(entity, graph);
             var presetName = (matched && matched.name()) || l10n.t('inspector.relation');
             var entityName = l10n.displayName(entity.tags) || '';
+            var color = _getColor(entity);
 
             return selection => {
                 selection
                     .append('b')
                     .text(presetName + ' ');
                 selection
                     .append('span')
-                    .classed('has-color', entity.tags.colour)
-                    .style('border-color', entity.tags.colour)
+                    .classed('has-color', !!color)
+                    .style('border-color', color)
                     .text(entityName);
             };
         }
@@ -362,8 +369,8 @@ export function uiSectionRawMembershipEditor(context) {
         labelLink
             .append('span')
             .attr('class', 'member-entity-name')
-            .classed('has-color', d => d.relation.tags.colour)
-            .style('border-color', d => d.relation.tags.colour)
+            .classed('has-color', d => !!_getColor(d.relation))
+            .style('border-color', d => _getColor(d.relation))
             .text(function(d) {
                 const matched = presets.match(d.relation, editor.staging.graph);
                 // hide the network from the name if there is NSI match

modules/util/index.js

@@ -3,6 +3,7 @@ export { utilFastMouse } from './util';
 export { utilFetchResponse, FetchError } from './fetch_response';
 export { utilFunctor } from './util';
 export { utilGetSetValue } from './get_set_value';
+export { utilIsColorValid } from './util';
 export { utilHighlightEntities } from './util';
 export { utilKeybinding } from './keybinding';
 export { utilNoAuto } from './util';

modules/util/util.js

@@ -39,6 +39,21 @@ export function utilHighlightEntities(ids, highlighted, context) {
 }
 
 
+// Returns whether value looks like a valid color we can display
+export function utilIsColorValid(value) {
+  // OSM only supports hex or named colors
+  if (!value.match(/^(#([0-9a-fA-F]{3}){1,2}|\w+)$/)) {
+    return false;
+  }
+  // see https://stackoverflow.com/a/68217760/1627467
+  if (!CSS.supports('color', value) || ['unset', 'inherit', 'initial', 'revert'].includes(value)) {
+    return false;
+  }
+
+  return true;
+}
+
+
 // `utilSetTransform`
 // Applies a CSS transformation to the given selection
 export function utilSetTransform(selection, x, y, scale, rotate) {