[MM-59367] export: enable exporting thread followers for CRT (#27623)

server/public/model/thread.go

@@ -3,6 +3,8 @@
 
 package model
 
+import "net/http"
+
 // Thread tracks the metadata associated with a root post and its reply posts.
 //
 // Note that Thread metadata does not exist until the first reply to a root post.
@@ -126,3 +128,21 @@ type ThreadMembership struct {
 	// threads with the mention count.
 	UnreadMentions int64 `json:"unread_mentions"`
 }
+
+func (o *ThreadMembership) IsValid() *AppError {
+	if !IsValidId(o.PostId) {
+		return NewAppError("ThreadMembership.IsValid", "model.thread.is_valid.post_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	if !IsValidId(o.UserId) {
+		return NewAppError("ThreadMembership.IsValid", "model.thread.is_valid.user_id.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	return nil
+}
+
+type ThreadMembershipForExport struct {
+	Username       string `json:"user_name"`
+	LastViewed     int64  `json:"last_viewed"`
+	UnreadMentions int64  `json:"unread_mentions"`
+}

server/public/model/thread_test.go

@@ -0,0 +1,39 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestThreadMembershipIsValid(t *testing.T) {
+	cases := map[string]struct {
+		Member        *ThreadMembership
+		ShouldBeValid bool
+	}{
+		"valid member": {
+			Member:        &ThreadMembership{PostId: NewId(), UserId: NewId()},
+			ShouldBeValid: true,
+		},
+		"empty post id": {
+			Member:        &ThreadMembership{PostId: "", UserId: NewId()},
+			ShouldBeValid: false,
+		},
+		"empty user id": {
+			Member:        &ThreadMembership{PostId: NewId(), UserId: ""},
+			ShouldBeValid: false,
+		},
+		"invalid post id": {
+			Member:        &ThreadMembership{PostId: "invalid", UserId: NewId()},
+			ShouldBeValid: false,
+		},
+	}
+	for name, tc := range cases {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tc.ShouldBeValid, (tc.Member.IsValid() == nil))
+		})
+	}
+}