Merged lightfinder changes

LightlessSyncServer/LightlessSyncServer/Hubs/MareHub.Functions.cs

@@ -323,7 +323,9 @@ public partial class LightlessHub
                          GID = user.Gid,
                          Synced = user.Synced,
                          OwnPermissions = ownperm,
-                         OtherPermissions = otherperm
+                         OtherPermissions = otherperm,
+                         OtherUserIsAdmin = u.IsAdmin,
+                         OtherUserIsModerator = u.IsModerator
                      };
 
         var resultList = await result.AsNoTracking().ToListAsync().ConfigureAwait(false);
@@ -336,7 +338,9 @@ public partial class LightlessHub
             resultList.Max(p => p.Synced),
             resultList.Select(p => string.IsNullOrEmpty(p.GID) ? Constants.IndividualKeyword : p.GID).ToList(),
             resultList[0].OwnPermissions,
-            resultList[0].OtherPermissions);
+            resultList[0].OtherPermissions,
+            resultList[0].OtherUserIsAdmin,
+            resultList[0].OtherUserIsModerator);
     }
 
     private async Task<Dictionary<string, UserInfo>> GetAllPairInfo(string uid)
@@ -408,7 +412,9 @@ public partial class LightlessHub
                          GID = user.Gid,
                          Synced = user.Synced,
                          OwnPermissions = ownperm,
-                         OtherPermissions = otherperm
+                         OtherPermissions = otherperm,
+                         OtherUserIsAdmin = u.IsAdmin,
+                         OtherUserIsModerator = u.IsModerator
                      };
 
         var resultList = await result.AsNoTracking().ToListAsync().ConfigureAwait(false);
@@ -419,7 +425,10 @@ public partial class LightlessHub
                 g.Max(p => p.Synced),
                 g.Select(p => string.IsNullOrEmpty(p.GID) ? Constants.IndividualKeyword : p.GID).ToList(),
                 g.First().OwnPermissions,
-                g.First().OtherPermissions);
+                g.First().OtherPermissions,
+                g.First().OtherUserIsAdmin,
+                g.First().OtherUserIsModerator
+                );
         }, StringComparer.Ordinal);
     }
 
@@ -484,5 +493,14 @@ public partial class LightlessHub
         return await result.Distinct().AsNoTracking().ToListAsync().ConfigureAwait(false);
     }
 
-    public record UserInfo(string Alias, bool IndividuallyPaired, bool IsSynced, List<string> GIDs, UserPermissionSet? OwnPermissions, UserPermissionSet? OtherPermissions);
+    public record UserInfo(
+        string Alias,
+        bool IndividuallyPaired,
+        bool IsSynced,
+        List<string> GIDs,
+        UserPermissionSet? OwnPermissions,
+        UserPermissionSet? OtherPermissions,
+        bool IsAdmin,
+        bool IsModerator
+    );
 }

LightlessSyncServer/LightlessSyncServer/Hubs/MareHub.Groups.cs

@@ -1,6 +1,8 @@
-using LightlessSync.API.Data.Enum;
+using LightlessSync.API.Data;
+using LightlessSync.API.Data.Enum;
 using LightlessSync.API.Data.Extensions;
 using LightlessSync.API.Dto.Group;
+using LightlessSync.API.Dto.User;
 using LightlessSyncServer.Utils;
 using LightlessSyncShared.Models;
 using LightlessSyncShared.Utils;
@@ -322,6 +324,11 @@ public partial class LightlessHub
         return new GroupJoinInfoDto(group.ToGroupData(), group.Owner.ToUserData(), group.ToEnum(), true);
     }
 
+    private static bool IsHex(char c) =>
+    (c >= '0' && c <= '9') ||
+    (c >= 'a' && c <= 'f') ||
+    (c >= 'A' && c <= 'F');
+
     [Authorize(Policy = "Identified")]
     public async Task<bool> GroupJoinFinalize(GroupJoinDto dto)
     {
@@ -331,12 +338,14 @@ public partial class LightlessHub
 
         var group = await DbContext.Groups.Include(g => g.Owner).AsNoTracking().SingleOrDefaultAsync(g => g.GID == aliasOrGid || g.Alias == aliasOrGid, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
         var groupGid = group?.GID ?? string.Empty;
-        var existingPair = await DbContext.GroupPairs.AsNoTracking().SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.GroupUserUID == UserUID, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
-        var hashedPw = StringUtils.Sha256String(dto.Password);
-        var existingUserCount = await DbContext.GroupPairs.AsNoTracking().CountAsync(g => g.GroupGID == groupGid, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
-        var joinedGroups = await DbContext.GroupPairs.CountAsync(g => g.GroupUserUID == UserUID, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
-        var isBanned = await DbContext.GroupBans.AnyAsync(g => g.GroupGID == groupGid && g.BannedUserUID == UserUID, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
-        var oneTimeInvite = await DbContext.GroupTempInvites.SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.Invite == hashedPw, cancellationToken: _contextAccessor.HttpContext.RequestAborted).ConfigureAwait(false);
+        var existingPair = await DbContext.GroupPairs.AsNoTracking().SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.GroupUserUID == UserUID).ConfigureAwait(false);
+        var hashedPw = dto.Password.Length == 64 && dto.Password.All(IsHex)
+            ? dto.Password
+            : StringUtils.Sha256String(dto.Password);
+        var existingUserCount = await DbContext.GroupPairs.AsNoTracking().CountAsync(g => g.GroupGID == groupGid).ConfigureAwait(false);
+        var joinedGroups = await DbContext.GroupPairs.CountAsync(g => g.GroupUserUID == UserUID).ConfigureAwait(false);
+        var isBanned = await DbContext.GroupBans.AnyAsync(g => g.GroupGID == groupGid && g.BannedUserUID == UserUID).ConfigureAwait(false);
+        var oneTimeInvite = await DbContext.GroupTempInvites.SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.Invite == hashedPw).ConfigureAwait(false);
 
         if (group == null
             || (!string.Equals(group.HashedPassword, hashedPw, StringComparison.Ordinal) && oneTimeInvite == null)
@@ -527,6 +536,88 @@ public partial class LightlessHub
         return true;
     }
 
+    [Authorize(Policy = "Identified")]
+    public async Task<GroupJoinInfoDto> GroupJoinHashed(GroupJoinHashedDto dto)
+    {
+        var aliasOrGid = dto.Group.GID.Trim();
+
+        _logger.LogCallInfo(LightlessHubLogger.Args(dto));
+
+        var group = await DbContext.Groups.Include(g => g.Owner)
+            .AsNoTracking()
+            .SingleOrDefaultAsync(g => g.GID == aliasOrGid || g.Alias == aliasOrGid)
+            .ConfigureAwait(false);
+
+        var groupGid = group?.GID ?? string.Empty;
+
+        var existingPair = await DbContext.GroupPairs
+            .AsNoTracking()
+            .SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.GroupUserUID == UserUID)
+            .ConfigureAwait(false);
+
+        var isBanned = await DbContext.GroupBans
+            .AnyAsync(g => g.GroupGID == groupGid && g.BannedUserUID == UserUID)
+            .ConfigureAwait(false);
+
+        var oneTimeInvite = await DbContext.GroupTempInvites
+            .SingleOrDefaultAsync(g => g.GroupGID == groupGid && g.Invite == dto.HashedPassword)
+            .ConfigureAwait(false);
+
+        var existingUserCount = await DbContext.GroupPairs
+            .AsNoTracking()
+            .CountAsync(g => g.GroupGID == groupGid)
+            .ConfigureAwait(false);
+
+        var joinedGroups = await DbContext.GroupPairs
+            .CountAsync(g => g.GroupUserUID == UserUID)
+            .ConfigureAwait(false);
+
+        if (group == null)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "Syncshell not found.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (!string.Equals(group.HashedPassword, dto.HashedPassword, StringComparison.Ordinal) && oneTimeInvite == null)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "Incorrect or expired password.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (existingPair != null)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "You are already a member of this syncshell.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (existingUserCount >= _maxGroupUserCount)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "This syncshell is full.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (!group.InvitesEnabled)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "Invites to this syncshell are currently disabled.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (joinedGroups >= _maxJoinedGroupsByUser)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "You have reached the maximum number of syncshells you can join.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        if (isBanned)
+        {
+            await Clients.User(UserUID).Client_ReceiveServerMessage(MessageSeverity.Warning, "You are banned from this syncshell.");
+            return new GroupJoinInfoDto(null, null, GroupPermissions.NoneSet, false);
+        }
+
+        return new GroupJoinInfoDto(group.ToGroupData(), group.Owner.ToUserData(), group.ToEnum(), true);
+    }
+
+
     [Authorize(Policy = "Identified")]
     public async Task GroupLeave(GroupDto dto)
     {
@@ -742,4 +833,70 @@ public partial class LightlessHub
 
         _logger.LogCallInfo(LightlessHubLogger.Args(dto, "Success"));
     }
+
+    [Authorize(Policy = "Identified")]
+    public async Task<bool> SetGroupBroadcastStatus(GroupBroadcastRequestDto dto)
+    {
+        _logger.LogCallInfo(LightlessHubLogger.Args(dto));
+
+        if (string.IsNullOrEmpty(dto.HashedCID))
+        {
+            _logger.LogCallWarning(LightlessHubLogger.Args("missing CID in syncshell broadcast request", "User", UserUID, "GID", dto.GID));
+            await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Error, "Internal error: missing CID.");
+            return false;
+        }
+
+        var (isOwner, _) = await TryValidateOwner(dto.GID).ConfigureAwait(false);
+        if (!isOwner)
+        {
+            _logger.LogCallWarning(LightlessHubLogger.Args("Unauthorized syncshell broadcast change", "User", UserUID, "GID", dto.GID));
+            await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Error, "You must be the owner of the syncshell to broadcast it.");
+            return false;
+        }
+
+        return true;
+    }
+
+    [Authorize(Policy = "Identified")]
+    public async Task<List<GroupJoinDto>> GetBroadcastedGroups(List<BroadcastStatusInfoDto> broadcastEntries)
+    {
+        _logger.LogCallInfo(LightlessHubLogger.Args("Requested Syncshells", broadcastEntries.Select(b => b.GID)));
+
+        var results = new List<GroupJoinDto>();
+        var gidsToValidate = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+
+        foreach (var entry in broadcastEntries)
+        {
+            if (string.IsNullOrWhiteSpace(entry.HashedCID) || string.IsNullOrWhiteSpace(entry.GID))
+                continue;
+
+            var redisKey = $"broadcast:{entry.HashedCID}";
+            var redisEntry = await _redis.GetAsync<BroadcastRedisEntry>(redisKey).ConfigureAwait(false);
+
+            if (redisEntry?.GID != null && string.Equals(redisEntry.GID, entry.GID, StringComparison.OrdinalIgnoreCase))
+                gidsToValidate.Add(entry.GID);
+        }
+
+        if (gidsToValidate.Count == 0)
+            return results;
+
+        var groups = await DbContext.Groups
+            .AsNoTracking()
+            .Where(g => gidsToValidate.Contains(g.GID) && g.InvitesEnabled)
+            .ToListAsync()
+            .ConfigureAwait(false);
+
+        foreach (var group in groups)
+        {
+            results.Add(new GroupJoinDto(
+                Group: new GroupData(group.GID, group.Alias),
+                Password: group.HashedPassword,
+                GroupUserPreferredPermissions: new GroupUserPreferredPermissions()
+            ));
+        }
+
+        return results;
+    }
+
+
 }

LightlessSyncServer/LightlessSyncServer/Hubs/MareHub.User.cs

@@ -1,9 +1,7 @@
-using System.Text;
-using System.Text.Json;
-using System.Text.RegularExpressions;
-using LightlessSync.API.Data;
+using LightlessSync.API.Data;
 using LightlessSync.API.Data.Enum;
 using LightlessSync.API.Data.Extensions;
+using LightlessSync.API.Dto.Group;
 using LightlessSync.API.Dto.User;
 using LightlessSyncServer.Utils;
 using LightlessSyncShared.Metrics;
@@ -13,6 +11,10 @@ using Microsoft.AspNetCore.SignalR;
 using Microsoft.EntityFrameworkCore;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
+using StackExchange.Redis;
+using System.Text;
+using System.Text.Json;
+using System.Text.RegularExpressions;
 
 namespace LightlessSyncServer.Hubs;
 
@@ -137,6 +139,322 @@ public partial class LightlessHub
         }
     }
 
+    [Authorize(Policy = "Identified")]
+    public async Task TryPairWithContentId(string otherCid, string myCid)
+    {
+        if (string.IsNullOrWhiteSpace(otherCid) || string.IsNullOrWhiteSpace(myCid))
+            return;
+
+        if (string.Equals(otherCid, myCid, StringComparison.Ordinal))
+        {
+            await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Warning, "You can't pair with yourself.").ConfigureAwait(false);
+            return;
+        }
+
+        var throttleKey = $"pairing:rate:{UserUID}";
+        var existingThrottle = await _redis.GetAsync<string>(throttleKey).ConfigureAwait(false);
+        if (existingThrottle != null)
+        {
+            await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Warning, "You're sending requests too quickly. Please wait a moment.").ConfigureAwait(false);
+            return;
+        }
+        await _redis.AddAsync(throttleKey, "true", TimeSpan.FromSeconds(5)).ConfigureAwait(false);
+
+        var reverseKey = $"pairing:{otherCid}:{myCid}";
+        var forwardKey = $"pairing:{myCid}:{otherCid}";
+
+        var json = await _redis.GetAsync<string>(reverseKey).ConfigureAwait(false);
+        if (json != null)
+        {
+            await _redis.RemoveAsync(reverseKey).ConfigureAwait(false);
+
+            try
+            {
+                var payload = JsonSerializer.Deserialize<PairingPayload>(json);
+                if (payload?.UID == null)
+                {
+                    _logger.LogCallWarning(LightlessHubLogger.Args("invalid payload", reverseKey));
+                    return;
+                }
+
+                var sender = await _pairService.TryAddPairAsync(UserUID, payload.UID);
+                var receiver = await _pairService.TryAddPairAsync(payload.UID, UserUID);
+
+                var user = await DbContext.Users.SingleAsync(u => u.UID == UserUID).ConfigureAwait(false);
+                var otherUser = await DbContext.Users.SingleAsync(u => u.UID == payload.UID).ConfigureAwait(false);
+
+                var pairData = await GetPairInfo(UserUID, payload.UID).ConfigureAwait(false);
+                var permissions = await DbContext.Permissions.SingleAsync(p =>
+                    p.UserUID == UserUID && p.OtherUserUID == payload.UID).ConfigureAwait(false);
+
+                var ownPerm = permissions.ToUserPermissions(setSticky: true);
+                var otherPerm = pairData?.OtherPermissions.ToUserPermissions() ?? new UserPermissions();
+
+                var individualPairStatus = pairData?.IsSynced == true
+                    ? IndividualPairStatus.Bidirectional
+                    : IndividualPairStatus.OneSided;
+
+                var dtoA = new UserPairDto(otherUser.ToUserData(), individualPairStatus, ownPerm, otherPerm);
+                var dtoB = new UserPairDto(user.ToUserData(), individualPairStatus, otherPerm, ownPerm);
+
+                await Clients.User(UserUID).Client_UserAddClientPair(dtoA).ConfigureAwait(false);
+                await Clients.User(payload.UID).Client_UserAddClientPair(dtoB).ConfigureAwait(false);
+
+                await Clients.User(payload.UID)
+                    .Client_UserUpdateOtherPairPermissions(new UserPermissionsDto(user.ToUserData(), permissions.ToUserPermissions()))
+                    .ConfigureAwait(false);
+
+                await Clients.User(payload.UID)
+                    .Client_UpdateUserIndividualPairStatusDto(new(user.ToUserData(), individualPairStatus))
+                    .ConfigureAwait(false);
+
+                await Clients.User(UserUID)
+                    .Client_UpdateUserIndividualPairStatusDto(new(otherUser.ToUserData(), individualPairStatus))
+                    .ConfigureAwait(false);
+
+                if (!ownPerm.IsPaused() && !otherPerm.IsPaused())
+                {
+                    var ident_sender = await GetUserIdent(UserUID).ConfigureAwait(false);
+                    var ident_receiver = await GetUserIdent(payload.UID).ConfigureAwait(false);
+
+                    if (ident_sender != null && ident_receiver != null)
+                    {
+                        await Clients.User(UserUID).Client_UserSendOnline(new(otherUser.ToUserData(), ident_receiver)).ConfigureAwait(false);
+                        await Clients.User(payload.UID).Client_UserSendOnline(new(user.ToUserData(), ident_sender)).ConfigureAwait(false);
+                    }
+                }
+
+                if (sender || receiver)
+                {
+                    await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Information, $"paired with {payload.UID}.").ConfigureAwait(false);
+                    await Clients.User(payload.UID).Client_ReceiveServerMessage(MessageSeverity.Information, $"paired with {UserUID}.").ConfigureAwait(false);
+
+                    _logger.LogCallInfo(LightlessHubLogger.Args("pair established", UserUID, payload.UID));
+                }
+
+                await _redis.RemoveAsync(forwardKey).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogCallWarning(LightlessHubLogger.Args("failed to process pairing", reverseKey, ex.Message));
+            }
+        }
+        else
+        {
+            var payload = new PairingPayload
+            {
+                UID = UserUID,
+                Timestamp = DateTime.UtcNow
+            };
+
+            var payloadJson = JsonSerializer.Serialize(payload);
+            await _redis.AddAsync(forwardKey, payloadJson, TimeSpan.FromMinutes(5)).ConfigureAwait(false);
+            await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Information, $"Pair request sent. Waiting for the other player to confirm.").ConfigureAwait(false);
+
+            _logger.LogCallInfo(LightlessHubLogger.Args("stored pairing request", myCid, otherCid));
+        }
+    }
+
+    private class PairingPayload
+    {
+        public string UID { get; set; } = string.Empty;
+        public DateTime Timestamp { get; set; }
+    }
+
+    public class BroadcastRedisEntry
+    {
+        public string HashedCID { get; set; } = string.Empty;
+        public string? GID { get; set; }
+    }
+
+    [Authorize(Policy = "Identified")]
+    public async Task SetBroadcastStatus(string hashedCid, bool enabled, GroupBroadcastRequestDto? groupDto = null)
+    {
+        var db = _redis.Database;
+        var broadcastKey = $"broadcast:{hashedCid}";
+
+        if (enabled)
+        {
+            string? gid = null;
+
+            if (groupDto is not null)
+            {
+                groupDto.HashedCID = hashedCid;
+
+                var valid = await SetGroupBroadcastStatus(groupDto).ConfigureAwait(false);
+                if (!valid)
+                    return;
+
+                gid = groupDto.GID;
+            }
+
+            var entry = new BroadcastRedisEntry
+            {
+                HashedCID = hashedCid,
+                GID = gid,
+            };
+
+            var json = JsonSerializer.Serialize(entry);
+            await db.StringSetAsync(broadcastKey, json, TimeSpan.FromMinutes(5)).ConfigureAwait(false);
+            _logger.LogCallInfo(LightlessHubLogger.Args("broadcast enabled", hashedCid, "GID", gid));
+        }
+        else
+        {
+            var value = await db.StringGetAsync(broadcastKey).ConfigureAwait(false);
+            if (value.IsNullOrEmpty)
+                return;
+
+            BroadcastRedisEntry? entry;
+            try
+            {
+                entry = JsonSerializer.Deserialize<BroadcastRedisEntry>(value!);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogCallWarning(LightlessHubLogger.Args("failed to deserialize broadcast entry during removal", "CID", hashedCid, "Value", value, "Error", ex));
+                return;
+            }
+
+            if (entry is null || entry.HashedCID != hashedCid)
+            {
+                _logger.LogCallWarning(LightlessHubLogger.Args("unauthorized attempt to remove broadcast", UserUID, "CID", hashedCid, "Stored", entry?.HashedCID));
+                await Clients.Caller.Client_ReceiveServerMessage(MessageSeverity.Error, "You can only disable your own broadcast. :3");
+                return;
+            }
+
+            await db.KeyDeleteAsync(broadcastKey).ConfigureAwait(false);
+            _logger.LogCallInfo(LightlessHubLogger.Args("broadcast disabled", hashedCid, "GID", entry.GID));
+        }
+    }
+
+
+    [Authorize(Policy = "Identified")]
+    public async Task<BroadcastStatusInfoDto?> IsUserBroadcasting(string hashedCid)
+    {
+        var db = _redis.Database;
+        var key = $"broadcast:{hashedCid}";
+
+        var result = await db.StringGetWithExpiryAsync(key).ConfigureAwait(false);
+        if (result.Expiry is null || result.Expiry <= TimeSpan.Zero || result.Value.IsNullOrEmpty)
+            return null;
+
+        BroadcastRedisEntry? entry;
+        try
+        {
+            entry = JsonSerializer.Deserialize<BroadcastRedisEntry>(result.Value!);
+        }
+        catch
+        {
+            return null;
+        }
+
+        var dto = new BroadcastStatusInfoDto
+        {
+            HashedCID = entry?.HashedCID ?? hashedCid,
+            IsBroadcasting = true,
+            TTL = result.Expiry,
+            GID = entry?.GID
+        };
+
+        _logger.LogCallInfo(LightlessHubLogger.Args("checked broadcast status", hashedCid, "TTL", result.Expiry, "GID", dto.GID));
+        return dto;
+    }
+
+    [Authorize(Policy = "Identified")]
+    public async Task<TimeSpan?> GetBroadcastTtl(string hashedCid)
+    {
+        var db = _redis.Database;
+        var key = $"broadcast:{hashedCid}";
+
+        var value = await db.StringGetAsync(key).ConfigureAwait(false);
+        if (value.IsNullOrEmpty)
+            return null;
+
+        BroadcastRedisEntry? entry;
+        try
+        {
+            entry = JsonSerializer.Deserialize<BroadcastRedisEntry>(value!);
+        }
+        catch
+        {
+            _logger.LogCallWarning(LightlessHubLogger.Args("invalid broadcast entry format", "CID", hashedCid));
+            return null;
+        }
+
+        if (entry?.HashedCID != hashedCid)
+        {
+            _logger.LogCallWarning(LightlessHubLogger.Args("unauthorized ttl query", UserUID, "CID", hashedCid, "EntryCID", entry?.HashedCID));
+            return null;
+        }
+
+        var ttl = await db.KeyTimeToLiveAsync(key).ConfigureAwait(false);
+        if (ttl is null || ttl <= TimeSpan.Zero)
+            return null;
+
+        _logger.LogCallInfo(LightlessHubLogger.Args("checked broadcast ttl", UserUID, "CID", hashedCid, "TTL", ttl, "GID", entry.GID));
+        return ttl;
+    }
+
+
+    private const int MaxBatchSize = 30;
+
+    [Authorize(Policy = "Identified")]
+    public async Task<BroadcastStatusBatchDto> AreUsersBroadcasting(List<string> hashedCids)
+    {
+        var db = _redis.Database;
+        if (hashedCids.Count > MaxBatchSize)
+            hashedCids = hashedCids.Take(MaxBatchSize).ToList();
+
+        var tasks = new Dictionary<string, Task<RedisValueWithExpiry>>(hashedCids.Count);
+        foreach (var cid in hashedCids)
+        {
+            var key = $"broadcast:{cid}";
+            tasks[cid] = db.StringGetWithExpiryAsync(key);
+        }
+
+        await Task.WhenAll(tasks.Values).ConfigureAwait(false);
+
+        var results = new Dictionary<string, BroadcastStatusInfoDto>(StringComparer.Ordinal);
+
+        foreach (var (cid, task) in tasks)
+        {
+            var result = task.Result;
+            var raw = result.Value;
+            TimeSpan? ttl = result.Expiry;
+
+            BroadcastRedisEntry? entry = null;
+            string? gid = null;
+            bool isBroadcasting = false;
+
+            if (!raw.IsNullOrEmpty && ttl > TimeSpan.Zero)
+            {
+                isBroadcasting = true;
+
+                try
+                {
+                    entry = JsonSerializer.Deserialize<BroadcastRedisEntry>(raw!);
+                    gid = entry?.GID;
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogCallWarning(LightlessHubLogger.Args("deserialization failed", "CID", cid, "Raw", raw.ToString(), "Error", ex));
+                }
+            }
+
+            results[cid] = new BroadcastStatusInfoDto
+            {
+                HashedCID = entry?.HashedCID ?? cid,
+                IsBroadcasting = isBroadcasting,
+                TTL = ttl,
+                GID = gid,
+            };
+        }
+
+        _logger.LogCallInfo(LightlessHubLogger.Args("batch checked broadcast", "Count", hashedCids.Count));
+        return new BroadcastStatusBatchDto { Results = results };
+    }
+
+
     [Authorize(Policy = "Identified")]
     public async Task UserDelete()
     {
@@ -175,7 +493,7 @@ public partial class LightlessHub
         var pairs = await GetAllPairInfo(UserUID).ConfigureAwait(false);
         return pairs.Select(p =>
         {
-            return new UserFullPairDto(new UserData(p.Key, p.Value.Alias),
+            return new UserFullPairDto(new UserData(p.Key, p.Value.Alias, p.Value.IsAdmin, p.Value.IsModerator),
                 p.Value.ToIndividualPairStatus(),
                 p.Value.GIDs.Where(g => !string.Equals(g, Constants.IndividualKeyword, StringComparison.OrdinalIgnoreCase)).ToList(),
                 p.Value.OwnPermissions.ToUserPermissions(setSticky: true),

LightlessSyncServer/LightlessSyncServer/Hubs/MareHub.cs

@@ -24,6 +24,7 @@ public partial class LightlessHub : Hub<ILightlessHub>, ILightlessHub
     private static readonly ConcurrentDictionary<string, string> _userConnections = new(StringComparer.Ordinal);
     private readonly LightlessMetrics _lightlessMetrics;
     private readonly SystemInfoService _systemInfoService;
+    private readonly PairService _pairService;
     private readonly IHttpContextAccessor _contextAccessor;
     private readonly LightlessHubLogger _logger;
     private readonly string _shardName;
@@ -45,7 +46,7 @@ public partial class LightlessHub : Hub<ILightlessHub>, ILightlessHub
         IDbContextFactory<LightlessDbContext> lightlessDbContextFactory, ILogger<LightlessHub> logger, SystemInfoService systemInfoService,
         IConfigurationService<ServerConfiguration> configuration, IHttpContextAccessor contextAccessor,
         IRedisDatabase redisDb, OnlineSyncedPairCacheService onlineSyncedPairCacheService, LightlessCensus lightlessCensus,
-        GPoseLobbyDistributionService gPoseLobbyDistributionService)
+        GPoseLobbyDistributionService gPoseLobbyDistributionService, PairService pairService)
     {
         _lightlessMetrics = lightlessMetrics;
         _systemInfoService = systemInfoService;
@@ -64,6 +65,7 @@ public partial class LightlessHub : Hub<ILightlessHub>, ILightlessHub
         _gPoseLobbyDistributionService = gPoseLobbyDistributionService;
         _logger = new LightlessHubLogger(this, logger);
         _dbContextLazy = new Lazy<LightlessDbContext>(() => lightlessDbContextFactory.CreateDbContext());
+        _pairService = pairService;
     }
 
     protected override void Dispose(bool disposing)

LightlessSyncServer/LightlessSyncServer/Services/PairService.cs

@@ -0,0 +1,108 @@
+using LightlessSyncShared.Data;
+using LightlessSyncShared.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Threading.Tasks;
+
+public class PairService
+{
+    private readonly IDbContextFactory<LightlessDbContext> _dbFactory;
+    private readonly ILogger<PairService> _logger;
+
+    public PairService(IDbContextFactory<LightlessDbContext> dbFactory, ILogger<PairService> logger)
+    {
+        _dbFactory = dbFactory;
+        _logger = logger;
+    }
+
+    public async Task<bool> TryAddPairAsync(string userUid, string otherUid)
+    {
+        if (userUid == otherUid || string.IsNullOrWhiteSpace(userUid) || string.IsNullOrWhiteSpace(otherUid))
+            return false;
+
+        await using var db = await _dbFactory.CreateDbContextAsync();
+
+        var user = await db.Users.SingleOrDefaultAsync(u => u.UID == userUid);
+        var other = await db.Users.SingleOrDefaultAsync(u => u.UID == otherUid);
+
+        if (user == null || other == null)
+            return false;
+
+        bool modified = false;
+
+        if (!await db.ClientPairs.AnyAsync(p => p.UserUID == userUid && p.OtherUserUID == otherUid))
+        {
+            db.ClientPairs.Add(new ClientPair
+            {
+                UserUID = userUid,
+                OtherUserUID = otherUid
+            });
+            modified = true;
+        }
+
+        if (!await db.ClientPairs.AnyAsync(p => p.UserUID == otherUid && p.OtherUserUID == userUid))
+        {
+            db.ClientPairs.Add(new ClientPair
+            {
+                UserUID = otherUid,
+                OtherUserUID = userUid
+            });
+            modified = true;
+        }
+
+        if (!await db.Permissions.AnyAsync(p => p.UserUID == userUid && p.OtherUserUID == otherUid))
+        {
+            var defaultPerms = await db.UserDefaultPreferredPermissions
+                .SingleOrDefaultAsync(p => p.UserUID == userUid);
+
+            if (defaultPerms != null)
+            {
+                db.Permissions.Add(new UserPermissionSet
+                {
+                    UserUID = userUid,
+                    OtherUserUID = otherUid,
+                    DisableAnimations = defaultPerms.DisableIndividualAnimations,
+                    DisableSounds = defaultPerms.DisableIndividualSounds,
+                    DisableVFX = defaultPerms.DisableIndividualVFX,
+                    IsPaused = false,
+                    Sticky = true,
+                });
+                modified = true;
+            }
+        }
+
+        if (!await db.Permissions.AnyAsync(p => p.UserUID == otherUid && p.OtherUserUID == userUid))
+        {
+            var defaultPerms = await db.UserDefaultPreferredPermissions
+                .SingleOrDefaultAsync(p => p.UserUID == otherUid);
+
+            if (defaultPerms != null)
+            {
+                db.Permissions.Add(new UserPermissionSet
+                {
+                    UserUID = otherUid,
+                    OtherUserUID = userUid,
+                    DisableAnimations = defaultPerms.DisableIndividualAnimations,
+                    DisableSounds = defaultPerms.DisableIndividualSounds,
+                    DisableVFX = defaultPerms.DisableIndividualVFX,
+                    IsPaused = false,
+                    Sticky = true,
+                });
+                modified = true;
+            }
+        }
+
+        if (modified)
+        {
+            await db.SaveChangesAsync();
+            _logger.LogInformation("Mutual pair established between {UserUID} and {OtherUID}", userUid, otherUid);
+        }
+        else
+        {
+            _logger.LogInformation("Pair already exists between {UserUID} and {OtherUID}", userUid, otherUid);
+        }
+
+        return modified;
+    }
+}

LightlessSyncServer/LightlessSyncServer/Startup.cs

@@ -105,6 +105,7 @@ public class Startup
             services.AddSingleton<CharaDataCleanupService>();
             services.AddHostedService(provider => provider.GetService<CharaDataCleanupService>());
             services.AddHostedService<ClientPairPermissionsCleanupService>();
+            services.AddScoped<PairService>();
         }
 
         services.AddSingleton<GPoseLobbyDistributionService>();