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

using Microsoft.AspNetCore.Mvc;

using PrivaPub.Api.Mastodon.Entities;
using PrivaPub.Api.Mastodon.Infrastructure;
using PrivaPub.Api.Mastodon.Mappers;
using PrivaPub.Domain.Privacy;
using PrivaPub.Federation.Actors;
using PrivaPub.Federation.Inbox;
using PrivaPub.Federation.Outbox;
using PrivaPub.Domain.Social;
using PrivaPub.Models.Post;
using PrivaPub.StaticServices;

using PostEntity = PrivaPub.Models.Post.Post;

namespace PrivaPub.Api.Mastodon.Controllers
{
	public class SearchController : MastodonController
	{
		readonly MastodonMapper _mapper;
		readonly DbEntities _dbEntities;
		readonly ILocalActorService _localActors;
		readonly IRemoteActorService _remoteActors;
		readonly IRemotePosts _remotePosts;
		readonly AccountSearch _search;

		public SearchController(MastodonMapper mapper, DbEntities dbEntities, ILocalActorService localActors, IRemoteActorService remoteActors,
			IRemotePosts remotePosts, AccountSearch search)
		{
			_mapper = mapper;
			_dbEntities = dbEntities;
			_localActors = localActors;
			_remoteActors = remoteActors;
			_remotePosts = remotePosts;
			_search = search;
		}

		// Anyone may search, as on Mastodon; only resolving (which fetches from other servers) and paging need a sign-in.
		[HttpGet("/api/v2/search"), Scope("read:search", requiresUser: false), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public async Task<IActionResult> Search(CancellationToken token)
		{
			var q = Params.Get("q")?.Trim();
			var type = Params.Get("type");
			var offset = Params.Int("offset") ?? 0;
			if (MyId == default && (Params.Bool("resolve") == true || offset > 0))
				return Error(StatusCodes.Status401Unauthorized, "Search queries that resolve uris or use offset require the read:search scope");
			var resolve = Params.Bool("resolve") == true && MyId != default;
			var results = new SearchResults();
			if (string.IsNullOrEmpty(q))
				return Json(results);

			if (q.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
			{
				var post = await _dbEntities.Posts.Match(p => (p.ObjectURI == q || p.Url == q) && !p.DeletedAt.HasValue).ExecuteFirstAsync(token);
				if (post == default && resolve && type is null or "statuses")
					post = await _remotePosts.StoreContext(q, 0, token);
				if (post != default && type is null or "statuses" && await VisibilityPolicy.CanSee(post, MyId, token))
					results.Statuses.Add(await _mapper.Status(post, MyId, token));
				if (results.Statuses.Count == 0 && type is null or "accounts")
				{
					var local = await _localActors.FindByUri(q, token);
					var foreign = local == default ? (resolve ? await _remoteActors.GetActor(q, refresh: false, token) : default) : default;
					if (local is { IsFederated: true, IsCircle: false })
						results.Accounts.Add(await _mapper.Local(local, false, token));
					else if (foreign != default)
						results.Accounts.Add(_mapper.Foreign(foreign));
				}
				return Json(results);
			}

			if (type is null or "accounts")
			{
				results.Accounts = await _search.Find(q, resolve, Limit(), Math.Max(0, offset), token);
			}
			if (type is null or "hashtags" && q.TrimStart('#') is { Length: > 0 } tag)
				results.Hashtags.Add(new { name = tag.ToLowerInvariant(), url = $"{_localActors.BaseAddress}/tags/{Uri.EscapeDataString(tag.ToLowerInvariant())}", history = Array.Empty<object>() });
			return Json(results);
		}
	}

	public class StubsController : MastodonController
	{
		[HttpGet("/api/v1/custom_emojis"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult CustomEmojis() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/filters"), Scope("read:filters")]
		public IActionResult FiltersV1() => Json(Array.Empty<object>());

		[HttpGet("/api/v2/filters"), Scope("read:filters")]
		public IActionResult FiltersV2() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/lists"), Scope("read:lists")]
		public IActionResult Lists() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/announcements"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult Announcements() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/trends"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult Trends() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/trends/tags"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult TrendTags() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/trends/statuses"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult TrendStatuses() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/trends/links"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult TrendLinks() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/suggestions"), Scope("read")]
		public IActionResult SuggestionsV1() => Json(Array.Empty<object>());

		[HttpGet("/api/v2/suggestions"), Scope("read")]
		public IActionResult SuggestionsV2() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/followed_tags"), Scope("read:follows")]
		public IActionResult FollowedTags() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/endorsements"), Scope("read:accounts")]
		public IActionResult Endorsements() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/featured_tags"), Scope("read:accounts")]
		public IActionResult FeaturedTags() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/scheduled_statuses"), Scope("read:statuses")]
		public IActionResult ScheduledStatuses() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/preferences"), Scope("read:accounts")]
		public IActionResult Preferences() => Json(new Dictionary<string, object>
		{
			["posting:default:visibility"] = Me.Settings.DefaultVisibility ?? "public",
			["posting:default:sensitive"] = Me.Settings.DefaultSensitive,
			["posting:default:language"] = Me.Settings.DefaultLanguage,
			["reading:expand:media"] = "default",
			["reading:expand:spoilers"] = false
		});

		[HttpGet("/api/v1/push/subscription"), Scope("push")]
		public IActionResult PushSubscription() => Error(StatusCodes.Status404NotFound, "Record not found");

		// Routes Mastodon answers that we have nothing behind: an empty or default answer lets clients degrade, where a
		// 404 breaks some of them (Mastodon invariant 5)
		[HttpGet("/api/v1/directory"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult Directory() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/timelines/link"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult LinkTimeline() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/accounts/{id}/identity_proofs"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult IdentityProofs(string id) => Json(Array.Empty<object>());

		[HttpGet("/api/v1/tags/{name}"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult Tag(string name)
		{
			var tag = name?.TrimStart('#').ToLowerInvariant() ?? string.Empty;
			var baseAddress = HttpContext.RequestServices.GetRequiredService<Federation.Actors.ILocalActorService>().BaseAddress;
			return Json(new { name = tag, url = $"{baseAddress}/tags/{Uri.EscapeDataString(tag)}", history = Array.Empty<object>(), following = false });
		}

		[HttpGet("/api/v1/instance/languages"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult Languages() => Json(InstanceController.LanguageCodes(HttpContext.RequestServices)
			.Select(code => new { code, name = System.Globalization.CultureInfo.GetCultureInfo(code).EnglishName }));

		[HttpGet("/api/v1/instance/translation_languages"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult TranslationLanguages() => Json(new { });

		[HttpGet("/api/v1/instance/domain_blocks"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult InstanceDomainBlocks() => Json(Array.Empty<object>());

		[HttpGet("/api/v1/instance/privacy_policy"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
		public IActionResult PrivacyPolicy() => Json(new
		{
			updated_at = "2026-10-04T00:00:00.000Z",
			content = "<p>One private login owns several public personas, and nobody but this server's admin can tell they belong "
				+ "together. What a persona posts is shared as its visibility says; a located post never leaves this server. "
				+ "Uploads lose their metadata. Statistics name servers, never people: see /stargazing.</p>"
		});

		[HttpGet("/api/v1/notifications/policy"), Scope("read:notifications")]
		public IActionResult NotificationPolicyV1() => Json(new
		{
			filter_not_following = false,
			filter_not_followers = false,
			filter_new_accounts = false,
			filter_private_mentions = false,
			summary = new { pending_requests_count = 0, pending_notifications_count = 0 }
		});

		[HttpGet("/api/v2/notifications/policy"), Scope("read:notifications")]
		public IActionResult NotificationPolicyV2() => Json(new
		{
			for_not_following = "accept",
			for_not_followers = "accept",
			for_new_accounts = "accept",
			for_private_mentions = "accept",
			for_limited_accounts = "accept",
			summary = new { pending_requests_count = 0, pending_notifications_count = 0 }
		});

		[HttpGet("/api/v1/notifications/requests"), Scope("read:notifications")]
		public IActionResult NotificationRequests() => Json(Array.Empty<object>());
	}
}