nadekobot/src/NadekoBot/Modules/Nsfw/Common/Downloaders/DerpibooruImageDownloader.cs

using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Threading;
using System.Threading.Tasks;
using NadekoBot.Extensions;

namespace NadekoBot.Modules.Nsfw.Common
{
    public class DerpibooruImageDownloader : ImageDownloader<DerpiImageObject>
    {
        public DerpibooruImageDownloader(HttpClient http) : base(Booru.Derpibooru, http)
        {
        }

        public override async Task<List<DerpiImageObject>> DownloadImagesAsync(string[] tags, int page, bool isExplicit = false, CancellationToken cancel = default)
        {
            var tagString = ImageDownloaderHelper.GetTagString(tags, isExplicit);
            var uri = $"https://www.derpibooru.org/api/v1/json/search/images?q={tagString.Replace('+', ',')}&per_page=49&page={page}";
            using var req = new HttpRequestMessage(HttpMethod.Get, uri);
            req.Headers.AddFakeHeaders();
            using var res = await _http.SendAsync(req, cancel).ConfigureAwait(false);
            res.EnsureSuccessStatusCode();
            
            var container = await res.Content.ReadFromJsonAsync<DerpiContainer>(_serializerOptions, cancel).ConfigureAwait(false);
            if (container?.Images is null)
                return new();
            
            return container.Images
                .Where(x => !string.IsNullOrWhiteSpace(x.ViewUrl))
                .ToList();
        }
    }
}