Excludes remote channels from channel search (#28708)

* Excludes remote channels from channel search

This is done through a new body parameter in the SearchAllChannels
endpoint that allows to search for local only channels, which are
either channels that are shared but marked as homed locally, or
channels that are not shared at all.

* fix lint

* Fix tests

---------

Co-authored-by: Caleb Roseland <caleb@calebroseland.com>

server/channels/store/sqlstore/channel_store.go

@@ -3411,6 +3411,16 @@ func (s SqlChannelStore) channelSearchQuery(opts *store.ChannelSearchOpts) sq.Se
 		})
 	}
 
+	if opts.ExcludeRemote {
+		// local channels either have a SharedChannels record with
+		// home set to true, or don't have a SharedChannels record at all
+		query = query.LeftJoin("SharedChannels ON c.Id = SharedChannels.ChannelId").
+			Where(sq.Or{
+				sq.Eq{"SharedChannels.Home": true},
+				sq.Eq{"SharedChannels.ChannelId": nil},
+			})
+	}
+
 	return query
 }
 

server/channels/store/store.go

@@ -1074,6 +1074,7 @@ type ChannelSearchOpts struct {
 	IncludePolicyID          bool
 	IncludeTeamInfo          bool
 	IncludeSearchById        bool
+	ExcludeRemote            bool
 	CountOnly                bool
 	Public                   bool
 	Private                  bool

server/channels/store/storetest/channel_store.go

@@ -6506,6 +6506,29 @@ func testChannelStoreSearchAllChannels(t *testing.T, rctx request.CTX, ss store.
 	})
 	require.NoError(t, nErr)
 
+	// Mark o12 and o14 as shared, o13 will be homed locally and o14
+	// will be homed remotely
+	sc12 := &model.SharedChannel{
+		ChannelId: o12.Id,
+		TeamId:    o12.TeamId,
+		CreatorId: model.NewId(),
+		ShareName: "testsharelocal",
+		Home:      true,
+	}
+	_, scErr := ss.SharedChannel().Save(sc12)
+	require.NoError(t, scErr)
+
+	sc14 := &model.SharedChannel{
+		ChannelId: o14.Id,
+		TeamId:    o14.TeamId,
+		CreatorId: model.NewId(),
+		ShareName: "testshareremote",
+		Home:      false,
+		RemoteId:  model.NewId(),
+	}
+	_, sc2Err := ss.SharedChannel().Save(sc14)
+	require.NoError(t, sc2Err)
+
 	testCases := []struct {
 		Description     string
 		Term            string
@@ -6550,6 +6573,7 @@ func testChannelStoreSearchAllChannels(t *testing.T, rctx request.CTX, ss store.
 		{"Filter team 1 and team 2, public and private and exclude group constrained", "", store.ChannelSearchOpts{IncludeDeleted: false, TeamIds: []string{t1.Id, t2.Id}, Public: true, Private: true, ExcludeGroupConstrained: true, Page: model.NewPointer(0), PerPage: model.NewPointer(5)}, model.ChannelList{&o1, &o2, &o3, &o4, &o6}, 12},
 		{"Filter deleted returns only deleted channels", "", store.ChannelSearchOpts{Deleted: true, Page: model.NewPointer(0), PerPage: model.NewPointer(5)}, model.ChannelList{&o13}, 1},
 		{"Search ChannelA by id", o1.Id, store.ChannelSearchOpts{IncludeDeleted: false, Page: model.NewPointer(0), PerPage: model.NewPointer(5), IncludeSearchById: true}, model.ChannelList{&o1}, 1},
+		{"Filter excluding remote channels", "", store.ChannelSearchOpts{IncludeDeleted: false, ExcludeRemote: true}, model.ChannelList{&o1, &o2, &o3, &o4, &o5, &o6, &o7, &o8, &o9, &o10, &o11, &o12}, 0},
 	}
 
 	for _, testCase := range testCases {