From bb791a895d95d6e346ec40e176ac3e67069d5362 Mon Sep 17 00:00:00 2001
From: Louis Chemineau <louis@chmn.me>
Date: Thu, 6 Jul 2023 17:01:20 +0200
Subject: [PATCH] feat: Use viewer to open and compare versions

Signed-off-by: Louis Chemineau <louis@chmn.me>
---
 .../files_versions/src/components/Version.vue | 59 +++++++++++------
 apps/files_versions/src/utils/davRequest.js   |  1 +
 apps/files_versions/src/utils/versions.js     | 63 +++++++++++++------
 apps/files_versions/src/views/VersionTab.vue  | 62 ++++++++++++++++++
 4 files changed, 147 insertions(+), 38 deletions(-)

diff --git a/apps/files_versions/src/components/Version.vue b/apps/files_versions/src/components/Version.vue
index 93dfb95b8b7..28b831ac37a 100644
--- a/apps/files_versions/src/components/Version.vue
+++ b/apps/files_versions/src/components/Version.vue
@@ -19,13 +19,13 @@
 	<div>
 		<NcListItem class="version"
 			:title="versionLabel"
-			:href="downloadURL"
 			:force-display-actions="true"
-			data-files-versions-version>
+			data-files-versions-version
+			@click="click">
 			<template #icon>
 				<div v-if="!(loadPreview || previewLoaded)" class="version__image" />
 				<img v-else-if="isCurrent || version.hasPreview"
-					:src="previewURL"
+					:src="version.previewUrl"
 					alt=""
 					decoding="async"
 					fetchpriority="low"
@@ -46,7 +46,7 @@
 				</div>
 			</template>
 			<template #actions>
-				<NcActionButton	v-if="enableLabeling"
+				<NcActionButton v-if="enableLabeling"
 					:close-after-click="true"
 					@click="openVersionLabelModal">
 					<template #icon>
@@ -54,6 +54,14 @@
 					</template>
 					{{ version.label === '' ? t('files_versions', 'Name this version') : t('files_versions', 'Edit version name') }}
 				</NcActionButton>
+				<NcActionButton v-if="!isCurrent && canView && canCompare"
+					:close-after-click="true"
+					@click="compareVersion">
+					<template #icon>
+						<FileCompare :size="22" />
+					</template>
+					{{ t('files_versions', 'Compare to current version') }}
+				</NcActionButton>
 				<NcActionButton v-if="!isCurrent"
 					:close-after-click="true"
 					@click="restoreVersion">
@@ -116,6 +124,7 @@
 <script>
 import BackupRestore from 'vue-material-design-icons/BackupRestore.vue'
 import Download from 'vue-material-design-icons/Download.vue'
+import FileCompare from 'vue-material-design-icons/FileCompare.vue'
 import Pencil from 'vue-material-design-icons/Pencil.vue'
 import Check from 'vue-material-design-icons/Check.vue'
 import Delete from 'vue-material-design-icons/Delete.vue'
@@ -124,7 +133,7 @@ import { NcActionButton, NcActionLink, NcListItem, NcModal, NcButton, NcTextFiel
 import moment from '@nextcloud/moment'
 import { translate } from '@nextcloud/l10n'
 import { joinPaths } from '@nextcloud/paths'
-import { generateUrl, getRootUrl } from '@nextcloud/router'
+import { getRootUrl } from '@nextcloud/router'
 import { loadState } from '@nextcloud/initial-state'
 
 export default {
@@ -138,6 +147,7 @@ export default {
 		NcTextField,
 		BackupRestore,
 		Download,
+		FileCompare,
 		Pencil,
 		Check,
 		Delete,
@@ -184,6 +194,14 @@ export default {
 			type: Boolean,
 			default: false,
 		},
+		canView: {
+			type: Boolean,
+			default: false,
+		},
+		canCompare: {
+			type: Boolean,
+			default: false,
+		},
 	},
 	data() {
 		return {
@@ -226,20 +244,6 @@ export default {
 			}
 		},
 
-		/**
-		 * @return {string}
-		 */
-		previewURL() {
-			if (this.isCurrent) {
-				return generateUrl('/core/preview?fileId={fileId}&c={fileEtag}&x=250&y=250&forceIcon=0&a=0', {
-					fileId: this.fileInfo.id,
-					fileEtag: this.fileInfo.etag,
-				})
-			} else {
-				return this.version.preview
-			}
-		},
-
 		/** @return {string} */
 		formattedDate() {
 			return moment(this.version.mtime).format('LLL')
@@ -253,7 +257,7 @@ export default {
 		/** @return {boolean} */
 		enableDeletion() {
 			return this.capabilities.files.version_deletion === true && this.fileInfo.mountType !== 'group'
-		}
+		},
 	},
 	methods: {
 		openVersionLabelModal() {
@@ -276,6 +280,21 @@ export default {
 		deleteVersion() {
 			this.$emit('delete', this.version)
 		},
+
+		click() {
+			if (!this.canView) {
+				window.location = this.downloadURL
+				return
+			}
+			this.$emit('click', { version: this.version })
+		},
+
+		compareVersion() {
+			if (!this.canView) {
+				throw new Error('Cannot compare version of this file')
+			}
+			this.$emit('compare', { version: this.version })
+		},
 	},
 }
 </script>
diff --git a/apps/files_versions/src/utils/davRequest.js b/apps/files_versions/src/utils/davRequest.js
index fec64caa2d5..d3fe729aaab 100644
--- a/apps/files_versions/src/utils/davRequest.js
+++ b/apps/files_versions/src/utils/davRequest.js
@@ -29,6 +29,7 @@ export default `<?xml version="1.0"?>
 		<d:getcontentlength />
 		<d:getcontenttype />
 		<d:getlastmodified />
+		<d:getetag />
 		<nc:version-label />
 		<nc:has-preview />
 	</d:prop>
diff --git a/apps/files_versions/src/utils/versions.js b/apps/files_versions/src/utils/versions.js
index 71593dd0ce8..7f5ccfc0e69 100644
--- a/apps/files_versions/src/utils/versions.js
+++ b/apps/files_versions/src/utils/versions.js
@@ -20,25 +20,33 @@
  */
 
 import { getCurrentUser } from '@nextcloud/auth'
+import { joinPaths } from '@nextcloud/paths'
+import { generateRemoteUrl, generateUrl } from '@nextcloud/router'
+import moment from '@nextcloud/moment'
+
+import { encodeFilePath } from '../../../files/src/utils/fileUtils.js'
+
 import client from '../utils/davClient.js'
 import davRequest from '../utils/davRequest.js'
 import logger from '../utils/logger.js'
-import { joinPaths } from '@nextcloud/paths'
-import { generateUrl } from '@nextcloud/router'
-import moment from '@nextcloud/moment'
+import path from 'path'
 
 /**
  * @typedef {object} Version
  * @property {string} fileId - The id of the file associated to the version.
  * @property {string} label - 'Current version' or ''
- * @property {string} fileName - File name relative to the version DAV endpoint
- * @property {string} mimeType - Empty for the current version, else the actual mime type of the version
+ * @property {string} filename - File name relative to the version DAV endpoint
+ * @property {string} basename - A base name generated from the mtime
+ * @property {string} mime - Empty for the current version, else the actual mime type of the version
+ * @property {string} etag - Empty for the current version, else the actual mime type of the version
  * @property {string} size - Human readable size
  * @property {string} type - 'file'
  * @property {number} mtime - Version creation date as a timestamp
+ * @property {string} permissions - Only readable: 'R'
  * @property {boolean} hasPreview - Whether the version has a preview
- * @property {string} preview - Preview URL of the version
+ * @property {string} previewUrl - Preview URL of the version
  * @property {string} url - Download URL of the version
+ * @property {string} source - The WebDAV endpoint of the ressource
  * @property {string|null} fileVersion - The version id, null for the current version
  */
 
@@ -75,7 +83,7 @@ export async function restoreVersion(version) {
 		logger.debug('Restoring version', { url: version.url })
 		await client.moveFile(
 			`/versions/${getCurrentUser()?.uid}/versions/${version.fileId}/${version.fileVersion}`,
-			`/versions/${getCurrentUser()?.uid}/restore/target`
+			`/versions/${getCurrentUser()?.uid}/restore/target`,
 		)
 	} catch (exception) {
 		logger.error('Could not restore version', { exception })
@@ -91,20 +99,39 @@ export async function restoreVersion(version) {
  * @return {Version}
  */
 function formatVersion(version, fileInfo) {
+	const mtime = moment(version.lastmod).unix() * 1000
+	let previewUrl = ''
+	let filename = ''
+
+	if (mtime === fileInfo.mtime) { // Version is the current one
+		filename = path.join('files', getCurrentUser()?.uid ?? '', fileInfo.path, fileInfo.name)
+		previewUrl = generateUrl('/core/preview?fileId={fileId}&c={fileEtag}&x=250&y=250&forceIcon=0&a=0', {
+			fileId: fileInfo.id,
+			fileEtag: fileInfo.etag,
+		})
+	} else {
+		filename = version.filename
+		previewUrl = generateUrl('/apps/files_versions/preview?file={file}&version={fileVersion}', {
+			file: joinPaths(fileInfo.path, fileInfo.name),
+			fileVersion: version.basename,
+		})
+	}
+
 	return {
 		fileId: fileInfo.id,
 		label: version.props['version-label'],
-		fileName: version.filename,
-		mimeType: version.mime,
+		filename,
+		basename: moment(mtime).format('LLL'),
+		mime: version.mime,
+		etag: `${version.props.getetag}`,
 		size: version.size,
 		type: version.type,
-		mtime: moment(version.lastmod).unix() * 1000,
+		mtime,
+		permissions: 'R',
 		hasPreview: version.props['has-preview'] === 1,
-		preview: generateUrl('/apps/files_versions/preview?file={file}&version={fileVersion}', {
-			file: joinPaths(fileInfo.path, fileInfo.name),
-			fileVersion: version.basename,
-		}),
-		url: joinPaths('/remote.php/dav', version.filename),
+		previewUrl,
+		url: joinPaths('/remote.php/dav', filename),
+		source: generateRemoteUrl('dav') + encodeFilePath(filename),
 		fileVersion: version.basename,
 	}
 }
@@ -115,7 +142,7 @@ function formatVersion(version, fileInfo) {
  */
 export async function setVersionLabel(version, newLabel) {
 	return await client.customRequest(
-		version.fileName,
+		version.filename,
 		{
 			method: 'PROPPATCH',
 			data: `<?xml version="1.0"?>
@@ -129,7 +156,7 @@ export async function setVersionLabel(version, newLabel) {
 						</d:prop>
 					</d:set>
 					</d:propertyupdate>`,
-		}
+		},
 	)
 }
 
@@ -137,5 +164,5 @@ export async function setVersionLabel(version, newLabel) {
  * @param {Version} version
  */
 export async function deleteVersion(version) {
-	await client.deleteFile(version.fileName)
+	await client.deleteFile(version.filename)
 }
diff --git a/apps/files_versions/src/views/VersionTab.vue b/apps/files_versions/src/views/VersionTab.vue
index 6d3b07c2f88..a8b7ce10092 100644
--- a/apps/files_versions/src/views/VersionTab.vue
+++ b/apps/files_versions/src/views/VersionTab.vue
@@ -19,11 +19,15 @@
 	<ul data-files-versions-versions-list>
 		<Version v-for="version in orderedVersions"
 			:key="version.mtime"
+			:can-view="canView"
+			:can-compare="canCompare"
 			:load-preview="isActive"
 			:version="version"
 			:file-info="fileInfo"
 			:is-current="version.mtime === fileInfo.mtime"
 			:is-first-version="version.mtime === initialVersionMtime"
+			@click="openVersion"
+			@compare="compareVersion"
 			@restore="handleRestore"
 			@label-update="handleLabelUpdate"
 			@delete="handleDelete" />
@@ -32,6 +36,7 @@
 
 <script>
 import { showError, showSuccess } from '@nextcloud/dialogs'
+import isMobile from '@nextcloud/vue/dist/Mixins/isMobile.js'
 import { fetchVersions, deleteVersion, restoreVersion, setVersionLabel } from '../utils/versions.js'
 import Version from '../components/Version.vue'
 
@@ -40,6 +45,9 @@ export default {
 	components: {
 		Version,
 	},
+	mixins: [
+		isMobile,
+	],
 	data() {
 		return {
 			fileInfo: null,
@@ -78,6 +86,37 @@ export default {
 				.map(version => version.mtime)
 				.reduce((a, b) => Math.min(a, b))
 		},
+
+		viewerFileInfo() {
+			// We need to remap bitmask to dav permissions as the file info we have is converted through client.js
+			let davPermissions = ''
+			if (this.fileInfo.permissions & 1) {
+				davPermissions += 'R'
+			}
+			if (this.fileInfo.permissions & 2) {
+				davPermissions += 'W'
+			}
+			if (this.fileInfo.permissions & 8) {
+				davPermissions += 'D'
+			}
+			return {
+				...this.fileInfo,
+				mime: this.fileInfo.mimetype,
+				basename: this.fileInfo.name,
+				filename: this.fileInfo.path + this.fileInfo.name,
+				permissions: davPermissions,
+				fileid: this.fileInfo.id,
+			}
+		},
+
+		/** @return {boolean} */
+		canView() {
+			return window.OCA.Viewer?.mimetypesCompare?.includes(this.fileInfo.mimetype)
+		},
+
+		canCompare() {
+			return !this.isMobile
+		},
 	},
 	methods: {
 		/**
@@ -182,6 +221,29 @@ export default {
 		resetState() {
 			this.$set(this, 'versions', [])
 		},
+
+		openVersion({ version }) {
+			// Open current file view instead of read only
+			if (version.mtime === this.fileInfo.mtime) {
+				OCA.Viewer.open({ fileInfo: this.viewerFileInfo })
+				return
+			}
+
+			// Versions previews are too small for our use case, so we override hasPreview and previewUrl
+			// which makes the viewer render the original file.
+			const versions = this.versions.map(version => ({ ...version, hasPreview: false, previewUrl: undefined }))
+
+			OCA.Viewer.open({
+				fileInfo: versions.find(v => v.source === version.source),
+				enableSidebar: false,
+			})
+		},
+
+		compareVersion({ version }) {
+			const versions = this.versions.map(version => ({ ...version, hasPreview: false, previewUrl: undefined }))
+
+			OCA.Viewer.compare(this.viewerFileInfo, versions.find(v => v.source === version.source))
+		},
 	},
 }
 </script>