[CHA-1468] Add support for filter tags in channels

src/Clients/ChannelClient.FilterTags.cs

@@ -0,0 +1,54 @@
+using System.Collections.Generic;
+using System.Net;
+using System.Threading.Tasks;
+using StreamChat.Models;
+using StreamChat.Rest;
+
+namespace StreamChat.Clients
+{
+    /// <summary>
+    /// Convenience methods for updating a channel's filter tags.
+    /// </summary>
+    public partial class ChannelClient
+    {
+        /// <summary>
+        /// Adds one or more filter tags to the channel.
+        /// </summary>
+        public Task<UpdateChannelResponse> AddFilterTagsAsync(string channelType, string channelId,
+            params string[] filterTags) => AddFilterTagsAsync(channelType, channelId, (IEnumerable<string>)filterTags);
+
+        /// <summary>
+        /// Adds filter tags to the channel.
+        /// </summary>
+        public async Task<UpdateChannelResponse> AddFilterTagsAsync(string channelType, string channelId,
+            IEnumerable<string> filterTags, MessageRequest msg = null) => await ExecuteRequestAsync<UpdateChannelResponse>(
+            $"channels/{channelType}/{channelId}",
+            HttpMethod.POST,
+            HttpStatusCode.Created,
+            new ChannelUpdateRequest
+            {
+                AddFilterTags = filterTags,
+                Message = msg,
+            });
+
+        /// <summary>
+        /// Removes one or more filter tags from the channel.
+        /// </summary>
+        public Task<ApiResponse> RemoveFilterTagsAsync(string channelType, string channelId,
+            params string[] filterTags) => RemoveFilterTagsAsync(channelType, channelId, (IEnumerable<string>)filterTags);
+
+        /// <summary>
+        /// Removes filter tags from the channel.
+        /// </summary>
+        public async Task<ApiResponse> RemoveFilterTagsAsync(string channelType, string channelId,
+            IEnumerable<string> filterTags, MessageRequest msg = null) => await ExecuteRequestAsync<ApiResponse>(
+            $"channels/{channelType}/{channelId}",
+            HttpMethod.POST,
+            HttpStatusCode.Created,
+            new ChannelUpdateRequest
+            {
+                RemoveFilterTags = filterTags,
+                Message = msg,
+            });
+    }
+}

src/Clients/IChannelClient.cs

@@ -170,6 +170,20 @@ Task<PartialUpdateChannelResponse> PartialUpdateAsync(string channelType, string
         Task<ApiResponse> RemoveMembersAsync(string channelType, string channelId, IEnumerable<string> userIds,
             MessageRequest msg = null);
 
+        /// <summary>
+        /// Adds filter tags to a channel.
+        /// </summary>
+        Task<UpdateChannelResponse> AddFilterTagsAsync(string channelType, string channelId, IEnumerable<string> filterTags, MessageRequest msg = null);
+
+        Task<UpdateChannelResponse> AddFilterTagsAsync(string channelType, string channelId, params string[] filterTags);
+
+        /// <summary>
+        /// Removes filter tags from a channel.
+        /// </summary>
+        Task<ApiResponse> RemoveFilterTagsAsync(string channelType, string channelId, IEnumerable<string> filterTags, MessageRequest msg = null);
+
+        Task<ApiResponse> RemoveFilterTagsAsync(string channelType, string channelId, params string[] filterTags);
+
         /// <summary>
         /// Update channel member partially.
         /// </summary>

src/Models/Channel.cs

@@ -93,6 +93,7 @@ public class ChannelRequest : CustomDataBase
         public Language? AutoTranslationLanguage { get; set; }
         public bool? Frozen { get; set; }
         public IEnumerable<ChannelMember> Members { get; set; }
+        public IEnumerable<string> FilterTags { get; set; }
         public ConfigOverridesRequest ConfigOverrides { get; set; }
     }
 
@@ -117,6 +118,8 @@ public class ChannelUpdateRequest
         public IEnumerable<string> RemoveMembers { get; set; }
         public IEnumerable<string> AddModerators { get; set; }
         public IEnumerable<string> DemoteModerators { get; set; }
+        public IEnumerable<string> AddFilterTags { get; set; }
+        public IEnumerable<string> RemoveFilterTags { get; set; }
         public IEnumerable<string> Invites { get; set; }
         public int? Cooldown { get; set; }
         public bool? AcceptInvite { get; set; }

tests/ChannelClientTests.cs

@@ -590,6 +590,36 @@ public async Task TestRemoveMembersAsync()
             channel.Members.Should().NotContain(x => x.UserId == _user3.Id);
         }
 
+        [Test]
+        public async Task TestAddFilterTagsAsync()
+        {
+            var channel = await CreateChannelAsync(createdByUserId: _user1.Id);
+
+            await _channelClient.AddFilterTagsAsync(channel.Type, channel.Id, "alpha", "beta");
+
+            var channelState = await _channelClient.GetOrCreateAsync(channel.Type, channel.Id,
+                ChannelGetRequest.WithoutWatching());
+
+            channelState.Channel.GetData<string[]>("filter_tags").Should().Contain(new[] { "alpha", "beta" });
+        }
+
+        [Test]
+        public async Task TestRemoveFilterTagsAsync()
+        {
+            var channel = await CreateChannelAsync(createdByUserId: _user1.Id);
+
+            await _channelClient.AddFilterTagsAsync(channel.Type, channel.Id, "gamma", "delta");
+
+            await _channelClient.RemoveFilterTagsAsync(channel.Type, channel.Id, new[] { "gamma" });
+
+            var channelState = await _channelClient.GetOrCreateAsync(channel.Type, channel.Id,
+                ChannelGetRequest.WithoutWatching());
+
+            var tags = channelState.Channel.GetData<string[]>("filter_tags");
+            tags.Should().NotContain("gamma");
+            tags.Should().Contain("delta");
+        }
+
         [Test]
         public async Task TestAddModeratorsAsync()
         {

tests/MessageCountTests.cs

@@ -17,7 +17,7 @@ public class MessageCountTests : TestBase
         public async Task SetUp()
         {
             _user = await UpsertNewUserAsync();
-            _channel = await CreateChannelAsync(_user.Id, autoDelete: false);
+            _channel = await CreateChannelAsync(_user.Id, autoDelete: false, channelType: "team");
         }
 
         [TearDown]

tests/TestBase.cs

@@ -106,9 +106,9 @@ protected async Task<UserRequest> UpsertNewUserAsync()
             return user;
         }
 
-        protected async Task<ChannelWithConfig> CreateChannelAsync(string createdByUserId, IEnumerable<string> members = null, bool autoDelete = true)
+        protected async Task<ChannelWithConfig> CreateChannelAsync(string createdByUserId, IEnumerable<string> members = null, bool autoDelete = true, string channelType = "messaging")
         {
-            var channelResp = await _channelClient.GetOrCreateAsync("messaging", Guid.NewGuid().ToString(), new ChannelGetRequest
+            var channelResp = await _channelClient.GetOrCreateAsync(channelType, Guid.NewGuid().ToString(), new ChannelGetRequest
             {
                 Data = new ChannelRequest
                 {