AP.NET/Controllers/OutboxController.cs

using ActivityPub.Utils;
using Microsoft.AspNetCore.Mvc;
using KristofferStrube.ActivityStreams;

using Object = KristofferStrube.ActivityStreams.Object;

namespace ActivityPub.Controllers;

/// <summary>
/// API Controller for the Outbox
/// </summary>
[Route("[controller]")]
[ApiController]
public class OutboxController : ControllerBase {
  private readonly ILogger<OutboxController> _logger;

  /// <summary>
  /// Default Constructor
  /// </summary>
  /// <param name="logger">The logger</param>
  public OutboxController(ILogger<OutboxController> logger) {
    _logger = logger;
  }

  /// <summary>
  /// Method to create and process a new object.
  /// See https://www.w3.org/TR/activitypub/#client-to-server-interactions
  /// </summary>
  /// <param name="newData">The data for the Activity or Object to create</param>
  /// <returns>
  /// 201 (Created) on success with the new id in the Location header
  /// TODO: Also currently returns the newly created Action to assist in debugging.
  /// </returns>
  /// <response code="201">The new Activity's id is returned in the Location header</response>
  /// <response code="400">If the provided data is not a valid Activity or Object</response>
  [HttpPost(Name = "PostOutboxObject")]
  [ProducesResponseType(StatusCodes.Status201Created)]
  [ProducesResponseType(StatusCodes.Status400BadRequest)]
  public async Task<IActionResult> Post(IObjectOrLink newObjectOrLink) {

    ActivityStore Outbox = new(this.Url, ActivityStoreType.Outbox);

    if(newObjectOrLink == null || !(newObjectOrLink is Object))
      return this.BadRequest($"No valid Activity or Object found in the request body");

    Activity newActivity = (newObjectOrLink is Activity) ? (Activity)newObjectOrLink
      : Outbox.WrapObjectInCreate(newObjectOrLink as Object);

    //// Validate the activity
    //try {
    //  if (!Outbox.ValidateActivity(newActivity)) throw new ArgumentException();
    //}
    //catch (ArgumentException err) {
    //  return this.BadRequest(err.Message);
    //}

    newActivity = Outbox.InsertActivity(newActivity);

    return Created(newActivity.Id, newActivity);
  }

  /// <summary>
  /// Retrieves a single Activity by id
  /// See: https://www.w3.org/TR/activitypub/#outbox
  /// </summary>
  /// <param name="id">The identifier of the object to retrieve.</param>
  /// <returns>The Activity requested, or 404 (Not Found)</returns>
  [HttpGet("{id}", Name = "GetOutboxById")]
  public IActionResult Get(string id) {
    ActivityStore Outbox = new(this.Url, ActivityStoreType.Outbox);
    Activity? activity = Outbox.GetById(id);
    if (activity == null) return NotFound();
    else return Ok(activity);
  }

  /// <summary>
  /// Retrieves all Activities
  /// See: https://www.w3.org/TR/activitypub/#outbox
  /// </summary>
  /// <returns>A list of all activities</returns>
  [HttpGet(Name = "GetOutboxList")]
  public IActionResult Get() {
    ActivityStore Outbox = new(this.Url, ActivityStoreType.Outbox);
    return Ok(Outbox.GetAll());
  }
}