fix(trashbin): restrict restore and delete on the frontend

src/components/AppNavigation/CalendarList/Trashbin.vue

@@ -70,11 +70,11 @@
 									</td>
 									<td>
 										<div class="item-actions">
-											<NcButton variant="secondary" @click="restore(item)">
+											<NcButton v-if="item.canRestore" variant="secondary" @click="restore(item)">
 												{{ t('calendar', 'Restore') }}
 											</NcButton>
 
-											<NcActions :forceMenu="true">
+											<NcActions v-if="item.canDelete" :forceMenu="item.canRestore">
 												<NcActionButton @click="onDeletePermanently(item)">
 													<template #icon>
 														<IconDelete :size="20" decorative />
@@ -164,6 +164,7 @@ export default {
 				url: calendar._url,
 				deletedAt: calendar._props['{http://nextcloud.com/ns}deleted-at'],
 				color: calendar.color ?? uidToHexColor(calendar.displayname),
+				readonly: false,
 			}))
 			const formattedCalendarObjects = this.objects.map((vobject) => {
 				let eventSummary = t('calendar', 'Untitled item')
@@ -185,6 +186,8 @@ export default {
 				const color = vobject.calendarComponent.getComponentIterator().next().value?.color
 					?? vobject.calendar?.color
 					?? uidToHexColor(subline)
+				const canDelete = vobject.calendar?.canDeleteObject
+				const canRestore = vobject.calendar?.canCreateObject && vobject.calendar?.canModifyObject
 				return {
 					vobject,
 					type: 'object',
@@ -194,6 +197,8 @@ export default {
 					url: vobject.uri,
 					deletedAt: vobject.dav._props['{http://nextcloud.com/ns}deleted-at'],
 					color,
+					canDelete,
+					canRestore,
 				}
 			})
 
@@ -281,6 +286,9 @@ export default {
 				return
 			}
 			this.items.forEach((item) => {
+				if (!this.canModify(item)) {
+					return
+				}
 				this.onDeletePermanently(item)
 			})
 		},

src/store/calendars.js

@@ -126,17 +126,40 @@ export default defineStore('calendars', {
 		 * @return {Array}
 		 */
 		allDeletedCalendarObjects(state) {
-			const calendarUriMap = {}
+			const lastSegment = (uri) => (uri ?? '').split('/').filter(Boolean).at(-1) ?? ''
+
+			const sourceUriOf = (calendar) => {
+				const tail = lastSegment(calendar.url)
+				const at = tail.lastIndexOf('_shared_by_')
+				if (at > 0) {
+					return tail.slice(0, at)
+				}
+				return tail
+			}
+
+			// Key calendars by `${ownerUserId}|${sourceUri}` so deleted objects
+			// match their origin calendar across owned/shared/delegated views.
+			const calendarBySource = new Map()
 			state.calendars.forEach((calendar) => {
-				const withoutTrail = calendar.url.replace(/\/$/, '')
-				const uri = withoutTrail.slice(withoutTrail.lastIndexOf('/') + 1)
-				calendarUriMap[uri] = calendar
+				let key = `${lastSegment(calendar.owner)}|${sourceUriOf(calendar)}`
+				if (calendar.isDelegated) {
+					key += lastSegment(calendar.delegatorUrl)
+				}
+				calendarBySource.set(key, calendar)
 			})
 
-			return state.deletedCalendarObjects.map((obj) => ({
-				calendar: calendarUriMap[obj.dav._props['{http://nextcloud.com/ns}calendar-uri']],
-				...obj,
-			}))
+			return state.deletedCalendarObjects.map((obj) => {
+				const owner = obj.dav.calendarOwnerPrincipalUri
+				const sourceUri = obj.dav.sourceCalendarUri
+				let key = `${lastSegment(owner)}|${sourceUri}`
+				if (obj.dav.delegator) {
+					key += lastSegment(obj.dav.delegator)
+				}
+				return {
+					calendar: calendarBySource.get(key),
+					...obj,
+				}
+			})
 		},
 
 		/**