77 lines
2.8 KiB
C#
77 lines
2.8 KiB
C#
 
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using Microsoft.AspNetCore.Mvc;
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using MongoDB.Entities;
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using PrivaPub.Domain.Content;
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using PrivaPub.Federation.Actors;
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using PrivaPub.Federation.Rendering;
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using PrivaPub.Models.Post;
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using System.Text.Json.Nodes;
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namespace PrivaPub.Federation.Controllers
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{
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// Each of the server's custom emoji as an ActivityPub `Emoji` object at its id, /emojis/{shortcode} (completion program
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// R7; the path is LocalEmojis.Path): the tag that posts, actors and reactions carry, with its @context. GoToSocial takes
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// an emoji only with an id, and may read it there. A disabled emoji is not served (404, it may come back); a deleted one
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// answers 410 with a Tombstone. An emoji tells nothing about anyone, so it is served unsigned under SecureMode too, as the
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// server's own actors are; a browser is sent to the picture.
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[ApiController]
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public class EmojisController : ControllerBase
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{
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const string ActivityContentType = "application/activity+json; charset=utf-8";
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readonly ILocalActorService _localActors;
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public EmojisController(ILocalActorService localActors)
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{
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_localActors = localActors;
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}
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[HttpGet, Route("/" + LocalEmojis.Path + "/{shortcode}")]
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public async Task<IActionResult> Get(string shortcode, CancellationToken token)
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{
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Response.Headers.Vary = "Accept";
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if (!LocalEmojis.IsShortcode(shortcode))
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return NotFound();
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var key = shortcode.ToLowerInvariant();
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var emoji = await DB.Default.Find<LocalEmoji>().Match(e => e.Key == key).ExecuteFirstAsync(token);
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if (emoji == default || emoji.Shortcode != shortcode)
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return NotFound();
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if (emoji.DeletedAt is { } deleted)
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return new ContentResult
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{
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Content = new JsonObject
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{
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["@context"] = ActivityPubRenderer.ActivityStreams,
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["id"] = LocalEmojis.Uri(_localActors.BaseAddress, emoji.Shortcode),
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["type"] = "Tombstone",
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["formerType"] = "Emoji",
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["deleted"] = ActivityPubRenderer.Timestamp(deleted)
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}.ToJsonString(),
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ContentType = ActivityContentType,
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StatusCode = StatusCodes.Status410Gone
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};
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if (emoji.Disabled || string.IsNullOrEmpty(emoji.Url))
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return NotFound();
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if (WantsHtml())
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return Redirect(emoji.Url);
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var live = new LocalEmojis.Live(emoji.ID, emoji.Shortcode, emoji.Url, emoji.StaticUrl ?? emoji.Url, emoji.ContentType ?? "image/png",
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emoji.ImageUpdatedAt, emoji.Category, emoji.VisibleInPicker);
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return new ContentResult
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{
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Content = LocalEmojis.Document(live, _localActors.BaseAddress).ToJsonString(),
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ContentType = ActivityContentType,
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StatusCode = StatusCodes.Status200OK
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};
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}
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bool WantsHtml()
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{
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var accept = Request.Headers.Accept.ToString();
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return accept.Contains("text/html", StringComparison.OrdinalIgnoreCase)
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&& !accept.Contains("activity+json", StringComparison.OrdinalIgnoreCase)
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&& !accept.Contains("ld+json", StringComparison.OrdinalIgnoreCase);
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}
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}
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}
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