Filters: made on /filters, applied by each card where it is

The persona's filters (PrivaPub's /api/v2/filters): made, given words and
whole-word rules, contexts, an action and an expiry on /filters (linked from
Settings), and deleted; posts filtered one by one can be taken out. Every
status says which filters it matches; each page tells its cards where they
are (home and lists, notifications, public feeds, the thread around the
opened post, profiles), and a card leaves its post out (hide), folds it
behind the filter's title with a way to show it anyway (warn), or blurs its
media (blur). The e2e test folds and then hides a post of the persona's own.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Services/FilterService.cs

@@ -0,0 +1,73 @@
+using System.Net;
+
+using collAnon.Client.Services;
+
+using decePubClient.Extensions;
+using decePubClient.Models;
+using decePubClient.Models.Mastodon;
+
+using PrivaPub.ClientModels;
+
+namespace decePubClient.Services
+{
+	/// <summary>
+	/// The current persona's filters (PrivaPub's /api/v2/filters): made, changed with their keywords, given posts, and
+	/// deleted. What they match comes on each status (Status.Filtered); the card applies it. Lists come back empty on
+	/// failure; nothing throws.
+	/// </summary>
+	public class FilterService(IHttpService httpService, ILoggingService logger, CoalescingStringLocalizer localizer)
+	{
+		public async Task<List<Filter>> All(CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Get(APIs.Mastodon.GET_Filters, cancellationToken: cancellationToken);
+			if (response.IsSuccessStatusCode)
+				return await response.MastodonReadFromJsonAsync<List<Filter>>(cancellationToken) ?? [];
+
+			var result = await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+			if (result.StatusCode is not ((int)HttpStatusCode.Gone or (int)HttpStatusCode.NotFound))
+				await logger.ProcessWarning(result.ToString(localizer), $"{nameof(FilterService)}.{nameof(All)}", cancellationToken);
+			return [];
+		}
+
+		/// <summary>Makes the filter when filterId is null, or changes it; Data is the filter as PrivaPub keeps it.</summary>
+		public async Task<WebResult> Save(string filterId, FilterForm form, CancellationToken cancellationToken = default)
+		{
+			using var response = filterId is null
+				? await httpService.Post(APIs.Mastodon.POST_Filter, form, cancellationToken: cancellationToken)
+				: await httpService.Put(APIs.Mastodon.PUT_M_Filter(filterId), form, cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult { Data = await response.MastodonReadFromJsonAsync<Filter>(cancellationToken) };
+		}
+
+		public async Task<WebResult> Delete(string filterId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Delete(APIs.Mastodon.DELETE_M_Filter(filterId), cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult();
+		}
+
+		/// <summary>Adds a post to the filter; Data is the FilterStatus.</summary>
+		public async Task<WebResult> AddStatus(string filterId, string statusId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Post(APIs.Mastodon.POST_M_FilterStatus(filterId), new[] { new KeyValuePair<string, string>("status_id", statusId) },
+				cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult { Data = await response.MastodonReadFromJsonAsync<FilterStatus>(cancellationToken) };
+		}
+
+		public async Task<WebResult> RemoveStatus(string filterStatusId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Delete(APIs.Mastodon.DELETE_M_FilterStatus(filterStatusId), cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult();
+		}
+	}
+}