public async Task Update(int postId, PostUpdate update, User user)
{
Post?p = await repo.FindById(postId);
if (p == null)
{
throw new NotFoundException($"No post with Id {postId} found.");
}
p.Update(update);
await repo.Update(p);
await bus.Dispatch(new PostUpdateEvent(p));
}
protected async override Task <CommentView> HandleInput(CommentDeleteParams input)
{
using (var connection = database.GetConnection()) {
ICommentRepo commentRepo = database.GetRepo <ICommentRepo>(connection);
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
Comment?comment = await commentRepo.FindById(input.CommentId);
if (comment == null)
{
throw new InvalidOperationException();
}
// Check to see if they have permission first.
if (!(await this.permissionHandler.HasPermission(input.User, PermissionAction.DeleteComment, comment)))
{
throw new AuthorizationException();
}
// (Hopefully) it would be impossible for post to be null if a comment exists...
Post post = (await postRepo.FindById(comment.PostId)) !;
post.CommentCount -= (comment.ChildCount() + 1);
using (var transaction = connection.BeginTransaction()) {
await commentRepo.Delete(comment);
await postRepo.Update(post);
transaction.Commit();
}
return(commentMapper.Map(comment));
}
}
protected override async Task <PostView> HandleInput(PostUpdateParams input)
{
using (var connection = database.GetConnection()) {
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
Post? post = await postRepo.FindById(input.PostId);
if (post == null)
{
throw new InvalidOperationException();
}
if (!(await this.postPermissionHandler.HasPermission(input.User, PermissionAction.UpdatePost, post)))
{
throw new AuthorizationException();
}
if (post.Type == PostType.Link)
{
throw new InvalidOperationException("Link posts can't be updated.");
}
if (post.WasDeleted)
{
throw new InvalidOperationException("Post has already been deleted.");
}
post.Body = input.Body;
await postRepo.Update(post);
return(postMapper.Map(post));
}
}
protected async override Task <CommentView> HandleInput(CommentCreateParams input)
{
using (var connection = database.GetConnection()) {
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
ICommentRepo commentRepo = database.GetRepo <ICommentRepo>(connection);
IVoteRepo voteRepo = database.GetRepo <IVoteRepo>(connection);
// Locate the post to ensure it actually exists.
Post?post = await postRepo.FindById(input.PostId);
if (post == null)
{
throw new InvalidOperationException();
}
using (var transaction = connection.BeginTransaction()) {
Comment comment = new Comment()
{
User = input.User,
PostId = post.Id,
Body = input.Body,
CreationDate = DateTime.UtcNow
};
// Set the parent comment if needed.
if (input.ParentId != 0)
{
comment.Parent = await commentRepo.FindById(input.ParentId);
}
// Update the comment count cache on the post.
post.CommentCount++;
comment.Upvotes++;
await commentRepo.Add(comment);
Vote upvote = new Vote()
{
User = input.User,
ResourceId = comment.Id,
ResourceType = VoteResourceType.Comment,
Direction = VoteDirection.Up
};
await postRepo.Update(post);
await voteRepo.Add(upvote);
comment.Vote = upvote;
transaction.Commit();
return(commentMapper.Map(comment));
}
}
}
protected override async Task <VoteView> HandleInput(VoteOnPostParams input)
{
using (var connection = database.GetConnection()) {
IVoteRepo voteRepo = database.GetRepo <IVoteRepo>(connection);
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
IUserRepo userRepo = database.GetRepo <IUserRepo>(connection);
using (var transaction = connection.BeginTransaction()) {
Post post = (await postRepo.FindById(input.PostId)) !;
Vote?oldVote = await voteRepo.FindByUserAndPost(input.User.Username, input.PostId);
// Wipe out the old one...
if (oldVote != null)
{
post.RemoveVote(oldVote.Direction);
await voteRepo.Delete(oldVote);
if (post.Type != PostType.Text)
{
post.User.PostKarma -= (int)oldVote.Direction;
}
}
// Create the new vote, and update the comment's karma cache.
Vote newVote = new Vote()
{
User = input.User,
ResourceType = VoteResourceType.Post,
ResourceId = input.PostId,
Direction = input.Vote
};
post.AddVote(newVote.Direction);
if (post.Type != PostType.Text)
{
post.User.PostKarma += (int)newVote.Direction;
}
await voteRepo.Add(newVote);
await postRepo.Update(post);
await userRepo.Update(post.User);
transaction.Commit();
return(voteViewMapper.Map(newVote));
}
}
}
public async Task Handle(VoteOnPostEvent domainEvent)
{
Post?p = await repo.FindById(domainEvent.PostId);
if (p == null)
{
throw new InvalidOperationException();
}
if (domainEvent.OldVote != null)
{
p.Votes.RemoveVote(domainEvent.OldVote.Direction);
}
p.Votes.AddVote(domainEvent.NewVote.Direction);
await repo.Update(p);
}
protected async override Task <PostView?> HandleInput(FindByValueParams <int> input)
{
using (var connection = database.GetConnection()) {
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
IVoteRepo voteRepo = database.GetRepo <IVoteRepo>(connection);
Post?post = await postRepo.FindById(input.Value);
if (post == null)
{
return(null);
}
//Pull in the vote if needed.
if (input.User != null)
{
post.Vote = await voteRepo.FindByUserAndPost(input.User.Username, input.Value);
}
return(postMapper.Map(post));
}
}
protected override async Task <PostView?> HandleInput(PostDeleteParams input)
{
using (var connection = database.GetConnection()) {
IPostRepo postRepo = database.GetRepo <IPostRepo>(connection);
Post?p = await postRepo.FindById(input.PostId);
if (p == null)
{
throw new InvalidOperationException();
}
if (!(await this.permissionHandler.HasPermission(input.User, PermissionAction.DeletePost, p)))
{
throw new AuthorizationException();
}
await postRepo.Delete(p);
return(postMapper.Map(p));
}
}