118 lines
2.5 KiB
C#
118 lines
2.5 KiB
C#
using Microsoft.AspNetCore.Http;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using zero.Extensions;
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namespace zero.Web.ViewHelpers;
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public class ZeroPageHelper : IZeroPageHelper
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{
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HttpContext HttpContext;
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IMediaCollection Media;
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/// <summary>
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/// Media cache for repetitive queries within an HTTP request
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/// </summary>
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Dictionary<string, Media> Cache { get; set; } = new Dictionary<string, Media>();
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public ZeroPageHelper(IHttpContextAccessor httpContextAccessor, IMediaCollection media)
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{
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HttpContext = httpContextAccessor.HttpContext;
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Media = media;
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}
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/// <inheritdoc />
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public async Task<Media> GetById(string id)
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{
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if (id.IsNullOrEmpty())
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{
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return null;
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}
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if (!Cache.TryGetValue(id, out Media media))
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{
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media = await Media.Load(id);
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Cache.Add(id, media);
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}
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return media;
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}
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/// <inheritdoc />
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public async Task<Dictionary<string, Media>> GetByIds(string[] ids)
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{
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HashSet<string> remoteIds = new HashSet<string>();
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Dictionary<string, Media> items = new Dictionary<string, Media>();
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foreach (string id in ids)
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{
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if (Cache.TryGetValue(id, out Media media))
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{
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items.Add(id, media);
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}
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else
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{
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remoteIds.Add(id);
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}
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}
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if (remoteIds.Count > 0)
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{
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Dictionary<string, Media> remoteItems = await Media.Load(remoteIds);
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foreach (var item in remoteItems)
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{
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items.Add(item.Key, item.Value);
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Cache.Add(item.Key, item.Value);
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}
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}
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return items;
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}
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/// <inheritdoc />
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public async Task<string> GetUrl(string id, bool isAbsolute = false)
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{
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Media media = await GetById(id);
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return media?.Source;
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}
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/// <inheritdoc />
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public async Task<Dictionary<string, string>> GetUrls(string[] ids, bool isAbsolute = false)
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{
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Dictionary<string, Media> medias = await GetByIds(ids);
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return medias.ToDictionary(x => x.Key, x => x.Value?.Source);
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}
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}
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public interface IZeroPageHelper
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{
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/// <summary>
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/// Get media by Id
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/// </summary>
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Task<Media> GetById(string id);
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/// <summary>
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/// Get media items by Ids
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/// </summary>
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Task<Dictionary<string, Media>> GetByIds(string[] ids);
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/// <summary>
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/// Get source for a media item
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/// </summary>
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Task<string> GetUrl(string id, bool isAbsolute = false);
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/// <summary>
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/// Get source for media items
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/// </summary>
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Task<Dictionary<string, string>> GetUrls(string[] ids, bool isAbsolute = false);
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}
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