private void CheckAvailability(List <SearchResultItem> results)
        {
            if (results.Count == 0)
            {
                return;
            }

            if (!cmsConfiguration.Security.AccessControlEnabled)
            {
                // If security is not enabled, all content is available
                return;
            }

            // Create query
            var principal = securityService.GetCurrentPrincipal();
            var urls      = results.Select(r => r.Link).ToArray();
            var query     = repository.AsQueryable <Page>(p => urls.Contains(p.PageUrl));
            var pages     = query
                            .SelectMany(c => c.AccessRules, (page, accessRule) => new
            {
                PageUrl    = page.PageUrl,
                AccessRule = accessRule
            })
                            .ToList();

            foreach (var pageUrl in pages.Select(p => p.PageUrl).Distinct())
            {
                var page = pages.First(p => p.PageUrl == pageUrl);
                IList <IAccessRule> accessRules = pages.Where(p => p.PageUrl == pageUrl).Select(p => p.AccessRule).Cast <IAccessRule>().ToList();

                var level = accessControlService.GetAccessLevel(accessRules, principal);
                if (level < AccessLevel.Read)
                {
                    results.Where(r => r.Link == page.PageUrl).ToList().ForEach(r => r.IsDenied = true);
                }
            }

            results.ForEach(p =>
            {
                if (p.IsDenied)
                {
                    p.Link         = string.Empty;
                    p.FormattedUrl = LuceneGlobalization.SearchResults_Secured_LinkTitle;
                    p.Title        = LuceneGlobalization.SearchResults_Secured_Title;
                    p.Snippet      = LuceneGlobalization.SearchResults_Secured_Snippet;
                }
            });
        }
示例#2
0
        /// <summary>
        /// Gets the denied sitemaps.
        /// </summary>
        /// <returns>Denied Sitemaps it list.</returns>
        private IEnumerable <Guid> GetDeniedSitemaps()
        {
            var query = Repository.AsQueryable <Models.Sitemap>().Where(f => f.AccessRules.Any(b => b.AccessLevel == AccessLevel.Deny)).FetchMany(f => f.AccessRules);

            var list      = query.ToList().Distinct();
            var principle = securityService.GetCurrentPrincipal();

            foreach (var sitemap in list)
            {
                var accessLevel = accessControlService.GetAccessLevel(sitemap, principle);
                if (accessLevel == AccessLevel.Deny)
                {
                    yield return(sitemap.Id);
                }
            }
        }
示例#3
0
        private bool HasCurrentPrincipalAccess(IAccessSecuredObject page)
        {
            if (!cmsConfiguration.Security.AccessControlEnabled)
            {
                return(true);
            }

            if (accessControlService == null)
            {
                return(true);
            }

            var principal   = SecurityService.GetCurrentPrincipal();
            var accessLevel = accessControlService.GetAccessLevel(page, principal);

            return(accessLevel != AccessLevel.Deny);
        }
示例#4
0
        private bool HasAccess(Guid pageId)
        {
            if (!cmsConfiguration.AccessControlEnabled)
            {
                return(true);
            }

            if (accessControlService == null)
            {
                return(true);
            }

            var principal   = SecurityService.GetCurrentPrincipal();
            var accessLevel = accessControlService.GetAccessLevel(pageId, principal);

            return(accessLevel != AccessLevel.Deny);
        }
示例#5
0
        private IEnumerable <Guid> GetDeniedPages(PagesFilter request)
        {
            var query = Repository.AsQueryable <Root.Models.Page>()
                        .Where(f => f.AccessRules.Any(b => b.AccessLevel == AccessLevel.Deny))
                        .FetchMany(f => f.AccessRules);

            var list      = query.ToList().Distinct();
            var principle = securityService.GetCurrentPrincipal();

            foreach (var page in list)
            {
                var accessLevel = accessControlService.GetAccessLevel(page, principle);
                if (accessLevel == AccessLevel.Deny)
                {
                    yield return(page.Id);
                }
            }
        }
示例#6
0
        /// <summary>
        /// Executes the specified id.
        /// </summary>
        /// <param name="id">The id.</param>
        /// <returns>
        /// Response type of <see cref="DownloadFileCommandResponse" />
        /// </returns>
        /// <exception cref="System.Web.HttpException">403;Access Forbidden</exception>
        public DownloadFileCommandResponse Execute(Guid id)
        {
            // Load file
            var file = Repository
                       .AsQueryable <MediaFile>(f => f.Id == id && !f.IsDeleted)
                       .Select(f => new
            {
                FileUri = f.FileUri,
                Title   = f.Title,
                OriginalFileExtension = f.OriginalFileExtension,
                Type      = f.Type,
                PublicUrl = f.PublicUrl
            })
                       .FirstOne();

            // Access control is ALWAYS disabled for images
            var accesControlEnabled = cmsConfiguration.AccessControlEnabled && file.Type != MediaType.Image;

            if (!accesControlEnabled || !storageService.SecuredUrlsEnabled)
            {
                return(new DownloadFileCommandResponse {
                    RedirectUrl = file.PublicUrl
                });
            }

            // Get download URL with security token
            var principal   = SecurityService.GetCurrentPrincipal();
            var accessLevel = accessControlService.GetAccessLevel(id, principal);

            if (accessLevel == AccessLevel.Deny)
            {
                throw new HttpException(403, "Access Forbidden");
            }

            var url = storageService.GetSecuredUrl(file.FileUri);

            return(new DownloadFileCommandResponse {
                RedirectUrl = url
            });
        }
示例#7
0
        /// <summary>
        /// Gets the list of denied pages ids.
        /// </summary>
        /// <param name="useCache"></param>
        /// <returns>
        /// Enumerable list of denied pages ids
        /// </returns>
        public IEnumerable <Guid> GetDeniedPages(bool useCache = true)
        {
            IEnumerable <Root.Models.Page> list;
            var principal = securityService.GetCurrentPrincipal();

            if (useCache)
            {
                var cacheKey = string.Format("CMS_DeniedPages_{0}_C9E7517250F64F84ADC8-B991C8391306", principal.Identity.Name);
                list = cacheService.Get(cacheKey, new TimeSpan(0, 0, 0, 30), LoadDeniedPages);
            }
            else
            {
                list = LoadDeniedPages();
            }

            foreach (var page in list)
            {
                var accessLevel = accessControlService.GetAccessLevel(page, principal);
                if (accessLevel == AccessLevel.Deny)
                {
                    yield return(page.Id);
                }
            }
        }
示例#8
0
        /// <summary>
        /// Saves the blog post.
        /// </summary>
        /// <param name="request">The request.</param>
        /// <param name="principal">The principal.</param>
        /// <returns>
        /// Saved blog post entity
        /// </returns>
        public BlogPost SaveBlogPost(BlogPostViewModel request, IPrincipal principal)
        {
            string[] roles;
            if (request.DesirableStatus == ContentStatus.Published)
            {
                accessControlService.DemandAccess(principal, RootModuleConstants.UserRoles.PublishContent);
                roles = new[] { RootModuleConstants.UserRoles.PublishContent };
            }
            else
            {
                accessControlService.DemandAccess(principal, RootModuleConstants.UserRoles.EditContent);
                roles = new[] { RootModuleConstants.UserRoles.EditContent };
            }

            Layout layout;
            Page   masterPage;

            LoadLayout(out layout, out masterPage);

            if (masterPage != null)
            {
                var level = accessControlService.GetAccessLevel(masterPage, principal);
                if (level < AccessLevel.Read)
                {
                    var          message    = BlogGlobalization.SaveBlogPost_FailedToSave_InaccessibleMasterPage;
                    const string logMessage = "Failed to save blog post. Selected master page for page layout is inaccessible.";
                    throw new ValidationException(() => message, logMessage);
                }
            }

            var region      = LoadRegion(layout, masterPage);
            var isNew       = request.Id.HasDefaultValue();
            var userCanEdit = securityService.IsAuthorized(RootModuleConstants.UserRoles.EditContent);

            // UnitOfWork.BeginTransaction(); // NOTE: this causes concurrent data exception.

            BlogPost        blogPost;
            BlogPostContent content     = null;
            PageContent     pageContent = null;

            Pages.Models.Redirect redirectCreated = null;

            // Loading blog post and it's content, or creating new, if such not exists
            if (!isNew)
            {
                var blogPostFuture = repository
                                     .AsQueryable <BlogPost>(b => b.Id == request.Id)
                                     .ToFuture();

                content = repository
                          .AsQueryable <BlogPostContent>(c => c.PageContents.Any(x => x.Page.Id == request.Id && !x.IsDeleted))
                          .ToFuture()
                          .FirstOrDefault();

                blogPost = blogPostFuture.FirstOne();

                if (cmsConfiguration.Security.AccessControlEnabled)
                {
                    accessControlService.DemandAccess(blogPost, principal, AccessLevel.ReadWrite, roles);
                }

                if (content != null)
                {
                    // Check if user has confirmed the deletion of content
                    if (!request.IsUserConfirmed && blogPost.IsMasterPage)
                    {
                        var hasAnyChildren = contentService.CheckIfContentHasDeletingChildren(blogPost.Id, content.Id, request.Content);
                        if (hasAnyChildren)
                        {
                            var message    = PagesGlobalization.SaveContent_ContentHasChildrenContents_RegionDeleteConfirmationMessage;
                            var logMessage = string.Format("User is trying to delete content regions which has children contents. Confirmation is required. ContentId: {0}, PageId: {1}",
                                                           content.Id, blogPost.Id);
                            throw new ConfirmationRequestException(() => message, logMessage);
                        }
                    }

                    pageContent = repository.FirstOrDefault <PageContent>(c => c.Page == blogPost && !c.IsDeleted && c.Content == content);
                }

                if (userCanEdit && !string.Equals(blogPost.PageUrl, request.BlogUrl) && request.BlogUrl != null)
                {
                    request.BlogUrl = urlService.FixUrl(request.BlogUrl);
                    pageService.ValidatePageUrl(request.BlogUrl, request.Id);
                    if (request.RedirectFromOldUrl)
                    {
                        var redirect = redirectService.CreateRedirectEntity(blogPost.PageUrl, request.BlogUrl);
                        if (redirect != null)
                        {
                            repository.Save(redirect);
                            redirectCreated = redirect;
                        }
                    }

                    blogPost.PageUrl = urlService.FixUrl(request.BlogUrl);
                }
            }
            else
            {
                blogPost = new BlogPost();
            }

            if (pageContent == null)
            {
                pageContent = new PageContent {
                    Region = region, Page = blogPost
                };
            }

            // Push to change modified data each time.
            blogPost.ModifiedOn = DateTime.Now;
            blogPost.Version    = request.Version;

            if (userCanEdit)
            {
                blogPost.Title       = request.Title;
                blogPost.Description = request.IntroText;
                blogPost.Author      = request.AuthorId.HasValue ? repository.AsProxy <Author>(request.AuthorId.Value) : null;
                blogPost.Category    = request.CategoryId.HasValue ? repository.AsProxy <Category>(request.CategoryId.Value) : null;
                blogPost.Image       = (request.Image != null && request.Image.ImageId.HasValue) ? repository.AsProxy <MediaImage>(request.Image.ImageId.Value) : null;
                if (isNew || request.DesirableStatus == ContentStatus.Published)
                {
                    blogPost.ActivationDate = request.LiveFromDate;
                    blogPost.ExpirationDate = TimeHelper.FormatEndDate(request.LiveToDate);
                }
            }

            if (isNew)
            {
                if (!string.IsNullOrWhiteSpace(request.BlogUrl))
                {
                    blogPost.PageUrl = urlService.FixUrl(request.BlogUrl);
                    pageService.ValidatePageUrl(blogPost.PageUrl);
                }
                else
                {
                    blogPost.PageUrl = CreateBlogPermalink(request.Title);
                }

                blogPost.MetaTitle = request.MetaTitle ?? request.Title;
                if (masterPage != null)
                {
                    blogPost.MasterPage = masterPage;
                    masterPageService.SetPageMasterPages(blogPost, masterPage.Id);
                }
                else
                {
                    blogPost.Layout = layout;
                }
                UpdateStatus(blogPost, request.DesirableStatus);
                AddDefaultAccessRules(blogPost, principal, masterPage);
            }
            else if (request.DesirableStatus == ContentStatus.Published ||
                     blogPost.Status == PageStatus.Preview)
            {
                // Update only if publishing or current status is preview.
                // Else do not change, because it may change from published to draft status
                UpdateStatus(blogPost, request.DesirableStatus);
            }

            // Create content.
            var newContent = new BlogPostContent
            {
                Id               = content != null ? content.Id : Guid.Empty,
                Name             = request.Title,
                Html             = request.Content ?? string.Empty,
                EditInSourceMode = request.EditInSourceMode,
                ActivationDate   = request.LiveFromDate,
                ExpirationDate   = TimeHelper.FormatEndDate(request.LiveToDate)
            };

            // Preserve content if user is not authorized to change it.
            if (!userCanEdit)
            {
                if (content == null)
                {
                    throw new SecurityException("Forbidden: Access is denied."); // User has no rights to create new content.
                }

                var contentToPublish = (BlogPostContent)(content.History != null
                    ? content.History.FirstOrDefault(c => c.Status == ContentStatus.Draft) ?? content
                    : content);

                newContent.Name = contentToPublish.Name;
                newContent.Html = contentToPublish.Html;
            }

            content             = (BlogPostContent)contentService.SaveContentWithStatusUpdate(newContent, request.DesirableStatus);
            pageContent.Content = content;

            blogPost.PageUrlHash     = blogPost.PageUrl.UrlHash();
            blogPost.UseCanonicalUrl = request.UseCanonicalUrl;

            repository.Save(blogPost);
            repository.Save(content);
            repository.Save(pageContent);

            pageContent.Content   = content;
            blogPost.PageContents = new [] { pageContent };

            IList <Tag> newTags = null;

            if (userCanEdit)
            {
                tagService.SavePageTags(blogPost, request.Tags, out newTags);
            }

            // Commit
            unitOfWork.Commit();

            // Notify about new or updated blog post.
            if (isNew)
            {
                Events.BlogEvents.Instance.OnBlogCreated(blogPost);
            }
            else
            {
                Events.BlogEvents.Instance.OnBlogUpdated(blogPost);
            }

            // Notify about new created tags.
            Events.RootEvents.Instance.OnTagCreated(newTags);

            // Notify about redirect creation.
            if (redirectCreated != null)
            {
                Events.PageEvents.Instance.OnRedirectCreated(redirectCreated);
            }

            return(blogPost);
        }
        /// <summary>
        /// Deletes the page.
        /// </summary>
        /// <param name="model">The model.</param>
        /// <param name="principal">The principal.</param>
        /// <param name="messages">The messages.</param>
        /// <returns>
        /// Delete result
        /// </returns>
        /// <exception cref="ConcurrentDataException"></exception>
        /// <exception cref="System.ComponentModel.DataAnnotations.ValidationException">
        /// </exception>
        public bool DeletePage(DeletePageViewModel model, IPrincipal principal, IMessagesIndicator messages = null)
        {
            var languagesFuture = repository.AsQueryable <Language>().ToFuture();

            var page = repository
                       .AsQueryable <PageProperties>(p => p.Id == model.PageId)
                       .FetchMany(p => p.PageContents)
                       .ThenFetch(pc => pc.Content)
                       .ToFuture()
                       .FirstOne();

            if (model.Version > 0 && page.Version != model.Version)
            {
                throw new ConcurrentDataException(page);
            }

            if (page.IsMasterPage && repository.AsQueryable <MasterPage>(mp => mp.Master == page).Any())
            {
                var message    = PagesGlobalization.DeletePageCommand_MasterPageHasChildren_Message;
                var logMessage = string.Format("Failed to delete page. Page is selected as master page. Id: {0} Url: {1}", page.Id, page.PageUrl);
                throw new ValidationException(() => message, logMessage);
            }

            var isRedirectInternal = false;

            if (!string.IsNullOrWhiteSpace(model.RedirectUrl))
            {
                isRedirectInternal = urlService.ValidateInternalUrl(model.RedirectUrl);
                if (!isRedirectInternal && urlService.ValidateInternalUrl(urlService.FixUrl(model.RedirectUrl)))
                {
                    isRedirectInternal = true;
                }
                if (isRedirectInternal)
                {
                    model.RedirectUrl = urlService.FixUrl(model.RedirectUrl);
                }
            }

            if (model.UpdateSitemap)
            {
                accessControlService.DemandAccess(principal, RootModuleConstants.UserRoles.EditContent);
            }

            var sitemaps     = new Dictionary <Sitemap, bool>();
            var sitemapNodes = sitemapService.GetNodesByPage(page);

            if (model.UpdateSitemap)
            {
                sitemapNodes.Select(node => node.Sitemap)
                .Distinct()
                .ToList()
                .ForEach(
                    sitemap =>
                    sitemaps.Add(
                        sitemap,
                        !cmsConfiguration.Security.AccessControlEnabled || accessControlService.GetAccessLevel(sitemap, principal) == AccessLevel.ReadWrite));

                foreach (var node in sitemapNodes)
                {
                    if (sitemaps[node.Sitemap] && node.ChildNodes.Count > 0)
                    {
                        var logMessage = string.Format("In {0} sitemap node {1} has {2} child nodes.", node.Sitemap.Id, node.Id, node.ChildNodes.Count);
                        throw new ValidationException(() => PagesGlobalization.DeletePageCommand_SitemapNodeHasChildNodes_Message, logMessage);
                    }
                }
            }

            unitOfWork.BeginTransaction();

            // Update sitemap nodes
            IList <SitemapNode> updatedNodes = new List <SitemapNode>();
            IList <SitemapNode> deletedNodes = new List <SitemapNode>();

            UpdateSitemapNodes(model, page, sitemapNodes, sitemaps, languagesFuture.ToList(), updatedNodes, deletedNodes);

            Redirect redirect;

            if (!string.IsNullOrWhiteSpace(model.RedirectUrl))
            {
                if (string.Equals(page.PageUrl, model.RedirectUrl, StringComparison.OrdinalIgnoreCase))
                {
                    var logMessage = string.Format("Circular redirect loop from url {0} to url {0}.", model.RedirectUrl);
                    throw new ValidationException(() => PagesGlobalization.ValidatePageUrlCommand_SameUrlPath_Message, logMessage);
                }

                // Validate url
                if (!urlService.ValidateExternalUrl(model.RedirectUrl))
                {
                    var logMessage = string.Format("Invalid redirect url {0}.", model.RedirectUrl);
                    throw new ValidationException(() => PagesGlobalization.ValidatePageUrlCommand_InvalidUrlPath_Message, logMessage);
                }

                string patternsValidationMessage;
                if (isRedirectInternal &&
                    !urlService.ValidateUrlPatterns(model.RedirectUrl, out patternsValidationMessage, PagesGlobalization.DeletePage_RedirectUrl_Name))
                {
                    var logMessage = string.Format("{0}. URL: {1}.", patternsValidationMessage, model.RedirectUrl);
                    throw new ValidationException(() => patternsValidationMessage, logMessage);
                }

                redirect = redirectService.GetPageRedirect(page.PageUrl);
                if (redirect != null)
                {
                    redirect.RedirectUrl = model.RedirectUrl;
                }
                else
                {
                    redirect = redirectService.CreateRedirectEntity(page.PageUrl, model.RedirectUrl);
                }

                if (redirect != null)
                {
                    repository.Save(redirect);
                }
            }
            else
            {
                redirect = null;
            }

            // Delete child entities.
            if (page.PageTags != null)
            {
                foreach (var pageTag in page.PageTags)
                {
                    repository.Delete(pageTag);
                }
            }

            var deletedPageContents  = new List <PageContent>();
            var htmlContentsToDelete = new List <HtmlContent>();

            if (page.PageContents != null)
            {
                foreach (var pageContent in page.PageContents)
                {
                    // If content is HTML content, delete HTML content
                    var htmlContent = pageContent.Content as HtmlContent;
                    if (htmlContent != null)
                    {
                        var draft = pageContent.Content.History != null?pageContent.Content.History.FirstOrDefault(c => c.Status == ContentStatus.Draft) : null;

                        if (draft != null)
                        {
                            repository.Delete(draft);
                        }

                        repository.Delete(htmlContent);
                        htmlContentsToDelete.Add(htmlContent);
                    }

                    repository.Delete(pageContent);
                    deletedPageContents.Add(pageContent);
                }
            }

            if (page.Options != null)
            {
                foreach (var option in page.Options)
                {
                    repository.Delete(option);
                }
            }

            if (page.AccessRules != null)
            {
                var rules = page.AccessRules.ToList();
                rules.ForEach(page.RemoveRule);
            }

            if (page.MasterPages != null)
            {
                foreach (var master in page.MasterPages)
                {
                    repository.Delete(master);
                }
            }

            // Delete page
            repository.Delete <Root.Models.Page>(page);

            // Commit
            unitOfWork.Commit();

            var updatedSitemaps = new List <Sitemap>();

            foreach (var node in updatedNodes)
            {
                Events.SitemapEvents.Instance.OnSitemapNodeUpdated(node);
                if (!updatedSitemaps.Contains(node.Sitemap))
                {
                    updatedSitemaps.Add(node.Sitemap);
                }
            }

            foreach (var node in deletedNodes)
            {
                Events.SitemapEvents.Instance.OnSitemapNodeDeleted(node);
                if (!updatedSitemaps.Contains(node.Sitemap))
                {
                    updatedSitemaps.Add(node.Sitemap);
                }
            }

            foreach (var updatedSitemap in updatedSitemaps)
            {
                Events.SitemapEvents.Instance.OnSitemapUpdated(updatedSitemap);
            }

            // Notifying about redirect created
            if (redirect != null)
            {
                Events.PageEvents.Instance.OnRedirectCreated(redirect);
            }

            // Notify about deleted page contents
            foreach (var deletedPageContent in deletedPageContents)
            {
                Events.PageEvents.Instance.OnPageContentDeleted(deletedPageContent);
            }

            // Notify about deleted html contents
            foreach (var htmlContent in htmlContentsToDelete)
            {
                Events.PageEvents.Instance.OnHtmlContentDeleted(htmlContent);
            }

            // Notifying, that page is deleted.
            Events.PageEvents.Instance.OnPageDeleted(page);

            if (sitemaps.Any(tuple => !tuple.Value) && messages != null)
            {
                // Some sitemaps where skipped, because user has no permission to edit.
                messages.AddSuccess(PagesGlobalization.DeletePage_SitemapSkipped_Message);
            }

            return(true);
        }
        /// <summary>
        /// Saves the blog post.
        /// </summary>
        /// <param name="request">The request.</param>
        /// <param name="childContentOptionValues">The child content option values.</param>
        /// <param name="principal">The principal.</param>
        /// <param name="errorMessages">The error messages.</param>
        /// <returns>
        /// Saved blog post entity
        /// </returns>
        /// <exception cref="System.ComponentModel.DataAnnotations.ValidationException"></exception>
        /// <exception cref="SecurityException">Forbidden: Access is denied.</exception>
        public BlogPost SaveBlogPost(BlogPostViewModel request, IList <ContentOptionValuesViewModel> childContentOptionValues, IPrincipal principal, out string[] errorMessages)
        {
            errorMessages = new string[0];
            string[] roles;
            if (request.DesirableStatus == ContentStatus.Published)
            {
                accessControlService.DemandAccess(principal, RootModuleConstants.UserRoles.PublishContent);
                roles = new[] { RootModuleConstants.UserRoles.PublishContent };
            }
            else
            {
                accessControlService.DemandAccess(principal, RootModuleConstants.UserRoles.EditContent);
                roles = new[] { RootModuleConstants.UserRoles.EditContent };
            }

            var isNew       = request.Id.HasDefaultValue();
            var userCanEdit = securityService.IsAuthorized(RootModuleConstants.UserRoles.EditContent);

            ValidateData(isNew, request);

            BlogPost        blogPost;
            BlogPostContent content;
            PageContent     pageContent;

            GetBlogPostAndContentEntities(request, principal, roles, ref isNew, out content, out pageContent, out blogPost);
            var beforeChange = new UpdatingBlogModel(blogPost);

            // Master page / layout
            Layout layout;
            Page   masterPage;
            Region region;

            LoadDefaultLayoutAndRegion(out layout, out masterPage, out region);

            if (masterPage != null)
            {
                var level = accessControlService.GetAccessLevel(masterPage, principal);
                if (level < AccessLevel.Read)
                {
                    var          message    = BlogGlobalization.SaveBlogPost_FailedToSave_InaccessibleMasterPage;
                    const string logMessage = "Failed to save blog post. Selected master page for page layout is inaccessible.";
                    throw new ValidationException(() => message, logMessage);
                }
            }

            if (pageContent.Region == null)
            {
                pageContent.Region = region;
            }

            // Load master pages for updating page's master path and page's children master path
            IList <Guid>       newMasterIds;
            IList <Guid>       oldMasterIds;
            IList <Guid>       childrenPageIds;
            IList <MasterPage> existingChildrenMasterPages;

            PrepareForUpdateChildrenMasterPages(isNew, blogPost, request, out newMasterIds, out oldMasterIds, out childrenPageIds, out existingChildrenMasterPages);

            // TODO: TEST AND TRY TO FIX IT: TRANSACTION HERE IS REQUIRED!
            // UnitOfWork.BeginTransaction(); // NOTE: this causes concurrent data exception.

            Redirect redirectCreated = null;

            if (!isNew && userCanEdit && !string.Equals(blogPost.PageUrl, request.BlogUrl) && !string.IsNullOrWhiteSpace(request.BlogUrl))
            {
                request.BlogUrl = urlService.FixUrl(request.BlogUrl);
                pageService.ValidatePageUrl(request.BlogUrl, request.Id);
                if (request.RedirectFromOldUrl)
                {
                    var redirect = redirectService.CreateRedirectEntity(blogPost.PageUrl, request.BlogUrl);
                    if (redirect != null)
                    {
                        repository.Save(redirect);
                        redirectCreated = redirect;
                    }
                }

                blogPost.PageUrl = urlService.FixUrl(request.BlogUrl);
            }

            // Push to change modified data each time.
            blogPost.ModifiedOn = DateTime.Now;

            if (userCanEdit)
            {
                blogPost.Title       = request.Title;
                blogPost.Description = request.IntroText;
                blogPost.Author      = request.AuthorId.HasValue ? repository.AsProxy <Author>(request.AuthorId.Value) : null;
                blogPost.Category    = request.CategoryId.HasValue ? repository.AsProxy <Category>(request.CategoryId.Value) : null;
                blogPost.Image       = (request.Image != null && request.Image.ImageId.HasValue) ? repository.AsProxy <MediaImage>(request.Image.ImageId.Value) : null;
                if (isNew || request.DesirableStatus == ContentStatus.Published)
                {
                    blogPost.ActivationDate = request.LiveFromDate;
                    blogPost.ExpirationDate = TimeHelper.FormatEndDate(request.LiveToDate);
                }
            }

            if (isNew)
            {
                if (!string.IsNullOrWhiteSpace(request.BlogUrl))
                {
                    blogPost.PageUrl = urlService.FixUrl(request.BlogUrl);
                    pageService.ValidatePageUrl(blogPost.PageUrl);
                }
                else
                {
                    blogPost.PageUrl = CreateBlogPermalink(request.Title, null, blogPost.Category != null ? (Guid?)blogPost.Category.Id : null);
                }

                blogPost.MetaTitle = request.MetaTitle ?? request.Title;
                if (masterPage != null)
                {
                    blogPost.MasterPage = masterPage;
                    masterPageService.SetPageMasterPages(blogPost, masterPage.Id);
                }
                else
                {
                    blogPost.Layout = layout;
                }
                UpdateStatus(blogPost, request.DesirableStatus);
                AddDefaultAccessRules(blogPost, principal, masterPage);
            }
            else if (request.DesirableStatus == ContentStatus.Published ||
                     blogPost.Status == PageStatus.Preview)
            {
                // Update only if publishing or current status is preview.
                // Else do not change, because it may change from published to draft status
                UpdateStatus(blogPost, request.DesirableStatus);
            }

            // Create content.
            var newContent = new BlogPostContent
            {
                Id               = content != null ? content.Id : Guid.Empty,
                Name             = request.Title,
                Html             = request.Content ?? string.Empty,
                EditInSourceMode = request.EditInSourceMode,
                ActivationDate   = request.LiveFromDate,
                ExpirationDate   = TimeHelper.FormatEndDate(request.LiveToDate)
            };

            // Preserve content if user is not authorized to change it.
            if (!userCanEdit)
            {
                if (content == null)
                {
                    throw new SecurityException("Forbidden: Access is denied."); // User has no rights to create new content.
                }

                var contentToPublish = (BlogPostContent)(content.History != null
                    ? content.History.FirstOrDefault(c => c.Status == ContentStatus.Draft) ?? content
                    : content);

                newContent.Name = contentToPublish.Name;
                newContent.Html = contentToPublish.Html;
            }

            content             = SaveContentWithStatusUpdate(isNew, newContent, request, principal);
            pageContent.Content = content;
            optionService.SaveChildContentOptions(content, childContentOptionValues, request.DesirableStatus);

            blogPost.PageUrlHash     = blogPost.PageUrl.UrlHash();
            blogPost.UseCanonicalUrl = request.UseCanonicalUrl;

            MapExtraProperties(isNew, blogPost, content, pageContent, request, principal);

            // Notify about page properties changing.
            var cancelEventArgs = Events.BlogEvents.Instance.OnBlogChanging(beforeChange, new UpdatingBlogModel(blogPost));

            if (cancelEventArgs.Cancel)
            {
                errorMessages = cancelEventArgs.CancellationErrorMessages.ToArray();
                return(null);
            }

            repository.Save(blogPost);
            repository.Save(content);
            repository.Save(pageContent);

            masterPageService.UpdateChildrenMasterPages(existingChildrenMasterPages, oldMasterIds, newMasterIds, childrenPageIds);

            pageContent.Content   = content;
            blogPost.PageContents = new [] { pageContent };



            IList <Tag> newTags = null;

            if (userCanEdit)
            {
                newTags = SaveTags(blogPost, request);
            }

            // Commit
            unitOfWork.Commit();

            // Notify about new created tags.
            Events.RootEvents.Instance.OnTagCreated(newTags);

            // Notify about new or updated blog post.
            if (isNew)
            {
                Events.BlogEvents.Instance.OnBlogCreated(blogPost);
            }
            else
            {
                Events.BlogEvents.Instance.OnBlogUpdated(blogPost);
            }

            // Notify about redirect creation.
            if (redirectCreated != null)
            {
                Events.PageEvents.Instance.OnRedirectCreated(redirectCreated);
            }

            return(blogPost);
        }