Refactoring: merge video-watch scope into common.

In order to be able to use lit in videowatch related code, we have to
merge these scopes.

client/utils/user.ts

@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { RegisterClientOptions } from '@peertube/peertube-types/client'
+import type { Video } from '@peertube/peertube-types'
+import { logger } from './logger'
+
+export function isAnonymousUser (registerOptions: RegisterClientOptions): boolean {
+  return !registerOptions.peertubeHelpers.isLoggedIn()
+}
+
+export function guessIsMine (registerOptions: RegisterClientOptions, video: Video): boolean {
+  // Note: this is not safe, but it is not a problem:
+  // this function is used for non critical functions
+  try {
+    if (!video) {
+      return false
+    }
+    if (!video.isLocal) {
+      return false
+    }
+    if (!window.localStorage) {
+      return false
+    }
+    const username = window.localStorage.getItem('username') ?? ''
+    if (!username) {
+      return false
+    }
+    if (username !== video.account?.name) {
+      return false
+    }
+    return true
+  } catch (err) {
+    logger.error(err as string)
+    return false
+  }
+}
+
+export function guessIamIModerator (_registerOptions: RegisterClientOptions): boolean {
+  // Note: this is not safe, but it is not a problem:
+  // this function is used for non critical functions
+  try {
+    if (!window.localStorage) {
+      return false
+    }
+    const role = window.localStorage.getItem('role') ?? ''
+    if (!role) {
+      return false
+    }
+    if (role !== '0' && role !== '1') {
+      return false
+    }
+    return true
+  } catch (err) {
+    logger.error(err as string)
+    return false
+  }
+}