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WatchedTogether/Jellyfin.Plugin.WatchedTogether/Services/IGroupService.cs
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dtourolle 7be07d16a2
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Implement Watched Together shared viewing accounts
Replaces the plugin template with a working plugin that lets several
users share one viewing account while keeping their individual watched
lists accurate.

Three pieces:

- Auto-creating groups. Logging in as "alice+bob" with any named
  member's own password provisions the shared account and signs you in.
  Verified against 10.11.5: AuthenticateUser offers unmatched usernames
  to every enabled provider and re-queries afterwards, which is the hook
  this relies on. Gated on a real member password so knowing two
  usernames is not enough to create an account.

- Multi-password authentication. IRequiresResolvedUser hands us the
  resolved shared account; each member's live stored hash is checked via
  ICryptoProvider.Verify. Deliberately avoids re-entering
  UserManager.AuthenticateUser, which would trip every member's
  failed-attempt counter whenever a different member's password matched.

- One-way played-state sync. Shared account to members only, filtered to
  PlaybackFinished/TogglePlayed/Import so playback progress ticks are
  ignored. No loop guard needed: member writes carry a non-shared id.

Membership is stored as user IDs rather than re-parsed from the username,
so shared accounts can be renamed freely. The +/name collision resolves
itself because Jellyfin only consults the plugin when no local user
matches the typed name.

Targets Jellyfin 10.11.x / net9.0. Adds Gitea CI (test, build, release),
a builder image, and 34 tests covering the auth and sync rules.
2026-07-29 00:00:13 +02:00

42 lines
1.6 KiB
C#

using System;
using System.Collections.Generic;
using Jellyfin.Database.Implementations.Entities;
using Jellyfin.Plugin.WatchedTogether.Configuration;
namespace Jellyfin.Plugin.WatchedTogether.Services;
/// <summary>
/// Resolves shared-account groups from plugin configuration.
/// </summary>
public interface IGroupService
{
/// <summary>
/// Gets the active group owning the given shared account, if any.
/// </summary>
/// <param name="sharedUserId">The shared account identifier.</param>
/// <returns>The group, or <c>null</c> if this user is not an enabled shared account.</returns>
SharedGroup? GetGroupForSharedUser(Guid sharedUserId);
/// <summary>
/// Gets the members of a group that are currently eligible - existing and not disabled.
/// </summary>
/// <param name="group">The group whose members to resolve.</param>
/// <returns>The eligible member users.</returns>
IReadOnlyList<User> GetEligibleMembers(SharedGroup group);
/// <summary>
/// Determines whether the given user is a shared account managed by this plugin, regardless
/// of whether its group is currently enabled.
/// </summary>
/// <param name="userId">The user identifier to test.</param>
/// <returns><c>true</c> if the user is a managed shared account.</returns>
bool IsSharedAccount(Guid userId);
/// <summary>
/// Removes a deleted user from every group, disabling any group left with fewer than two
/// members, and persists the result.
/// </summary>
/// <param name="userId">The identifier of the user that was removed.</param>
void PruneDeletedUser(Guid userId);
}