fix(files): properly show file not found error

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

apps/files/src/views/FilesList.vue

@@ -525,14 +525,24 @@ export default defineComponent({
 		},
 	},
 
-	mounted() {
-		this.fetchContent()
-
+	async mounted() {
 		subscribe('files:node:deleted', this.onNodeDeleted)
 		subscribe('files:node:updated', this.onUpdatedNode)
 
 		// reload on settings change
 		subscribe('files:config:updated', this.fetchContent)
+
+		// Finally, fetch the current directory contents
+		await this.fetchContent()
+		if (this.fileId) {
+			// If we have a fileId, let's check if the file exists
+			const node = this.dirContents.find(node => node.fileid.toString() === this.fileId.toString())
+			// If the file isn't in the current directory nor if
+			// the current directory is the file, we show an error
+			if (!node && this.currentFolder.fileid.toString() !== this.fileId.toString()) {
+				showError(t('files', 'The file could not be found'))
+			}
+		}
 	},
 
 	unmounted() {

cypress/e2e/files/files.cy.ts

@@ -1,16 +1,57 @@
+import type { User } from "@nextcloud/cypress"
+
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 describe('Files', { testIsolation: true }, () => {
+	let currentUser: User
+
 	beforeEach(() => {
 		cy.createRandomUser().then((user) => {
-			cy.login(user)
+			currentUser = user
 		})
 	})
 
 	it('Login with a user and open the files app', () => {
+		cy.login(currentUser)
 		cy.visit('/apps/files')
 		cy.get('[data-cy-files-list] [data-cy-files-list-row-name="welcome.txt"]').should('be.visible')
 	})
+
+	it('Opens a valid file shows it as active', () => {
+		cy.uploadContent(currentUser, new Blob(), 'text/plain', '/original.txt').then((response) => {
+			const fileId = Number.parseInt(response.headers['oc-fileid'] ?? '0')
+
+			cy.login(currentUser)
+			cy.visit('/apps/files/files/' + fileId)
+
+			cy.get(`[data-cy-files-list-row-fileid=${fileId}]`)
+				.should('be.visible')
+			cy.get(`[data-cy-files-list-row-fileid=${fileId}]`)
+				.invoke('attr', 'data-cy-files-list-row-name').should('eq', 'original.txt')
+			cy.get(`[data-cy-files-list-row-fileid=${fileId}]`)
+				.invoke('attr', 'class').should('contain', 'active')
+			cy.contains('The file could not be found').should('not.exist')
+		})
+	})
+
+	it('Opens a valid folder shows its content', () => {
+		cy.mkdir(currentUser, '/folder').then(() => {
+			cy.login(currentUser)
+			cy.visit('/apps/files/files?dir=/folder')
+
+			cy.get('[data-cy-files-content-breadcrumbs]').contains('folder').should('be.visible')
+			cy.contains('The file could not be found').should('not.exist')
+		})
+	})
+
+	it('Opens an unknown file show an error', () => {
+		cy.intercept('PROPFIND', /\/remote.php\/dav\//).as('propfind')
+		cy.login(currentUser)
+		cy.visit('/apps/files/files/123456')
+
+		cy.wait('@propfind')
+		cy.contains('The file could not be found').should('be.visible')
+	})
 })