SocialPub/PrivaPub/Api/Mastodon/Controllers/ReactionsController.cs

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

using MongoDB.Entities;

using PrivaPub.Api.Mastodon.Infrastructure;
using PrivaPub.Api.Mastodon.Mappers;
using PrivaPub.Domain.Privacy;
using PrivaPub.Domain.Social;
using PrivaPub.Models.Post;
using PrivaPub.Models.Social;
using PrivaPub.StaticServices;

using PostEntity = PrivaPub.Models.Post.Post;

namespace PrivaPub.Api.Mastodon.Controllers
{
	public class ReactionsController : MastodonController
	{
		readonly DbEntities _dbEntities;
		readonly MastodonMapper _mapper;
		readonly IReactions _reactions;

		public ReactionsController(DbEntities dbEntities, MastodonMapper mapper, IReactions reactions)
		{
			_dbEntities = dbEntities;
			_mapper = mapper;
			_reactions = reactions;
		}

		[HttpGet("/api/v1/pleroma/statuses/{id}/reactions"), Scope("read:statuses", requiresUser: false), AllowAnonymous]
		public async Task<IActionResult> List(string id, CancellationToken token)
		{
			var post = await Visible(id, token);
			if (post == default)
				return NotFoundError();
			var reactions = await DB.Default.Find<Reaction>().Match(r => r.PostId == post.ID).ExecuteAsync(token);
			var accounts = await _mapper.Accounts(reactions.Select(r => r.AccountId), token);
			return Json(reactions.GroupBy(r => r.Emoji).Select(group => new
			{
				name = group.Key,
				count = group.Count(),
				me = MyId != default && group.Any(r => r.AccountId == MyId),
				url = _mapper.ProxiedUrl(group.First().EmojiURL),
				accounts = group.Select(r => accounts.GetValueOrDefault(r.AccountId)).Where(a => a != default).ToList()
			}).OrderByDescending(r => r.count).ToList());
		}

		[HttpPut("/api/v1/pleroma/statuses/{id}/reactions/{emoji}"), Scope("write:favourites")]
		public async Task<IActionResult> React(string id, string emoji, CancellationToken token)
		{
			var post = await Visible(id, token);
			if (post == default)
				return NotFoundError();
			if (!await _reactions.React(Me, post, Uri.UnescapeDataString(emoji), token))
				return Error(StatusCodes.Status422UnprocessableEntity, "Validation failed: That emoji cannot be used here");
			return Json(await _mapper.Status(post, MyId, token));
		}

		[HttpDelete("/api/v1/pleroma/statuses/{id}/reactions/{emoji}"), Scope("write:favourites")]
		public async Task<IActionResult> Unreact(string id, string emoji, CancellationToken token)
		{
			var post = await Visible(id, token);
			if (post == default)
				return NotFoundError();
			await _reactions.Unreact(Me, post, Uri.UnescapeDataString(emoji), token);
			return Json(await _mapper.Status(post, MyId, token));
		}

		async Task<PostEntity> Visible(string id, CancellationToken token)
		{
			var post = await _dbEntities.Posts.Match(p => p.ID == id && !p.DeletedAt.HasValue && p.ReblogOfPostId == null).ExecuteFirstAsync(token);
			return post != default && post.Visibility != PostVisibility.LocalGeo && await VisibilityPolicy.CanSee(post, MyId, token) ? post : default;
		}
	}
}