First pass for supporting lazy loading and not using base64 strings for loading images in UI.

API/Controllers/ImageController.cs

@@ -0,0 +1,79 @@
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using API.DTOs;
+using API.Interfaces;
+using API.Interfaces.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+
+namespace API.Controllers
+{
+    public class ImageController : BaseApiController
+    {
+        private readonly IDirectoryService _directoryService;
+        private readonly ICacheService _cacheService;
+        private readonly ILogger<ImageController> _logger;
+        private readonly IUnitOfWork _unitOfWork;
+
+        public ImageController(IDirectoryService directoryService, ICacheService cacheService,
+            ILogger<ImageController> logger, IUnitOfWork unitOfWork)
+        {
+            _directoryService = directoryService;
+            _cacheService = cacheService;
+            _logger = logger;
+            _unitOfWork = unitOfWork;
+        }
+        
+        [HttpGet("chapter-cover")]
+        public async Task<ActionResult> GetChapterCoverImage(int chapterId)
+        {
+            // TODO: Write custom methods to just get the byte[] as fast as possible
+            var chapter = await _unitOfWork.VolumeRepository.GetChapterAsync(chapterId);
+            var content = chapter.CoverImage;
+            var format = "jpeg"; //Path.GetExtension("jpeg").Replace(".", "");
+            
+            // Calculates SHA1 Hash for byte[]
+            using var sha1 = new System.Security.Cryptography.SHA1CryptoServiceProvider();
+            Response.Headers.Add("ETag", string.Concat(sha1.ComputeHash(content).Select(x => x.ToString("X2"))));
+            Response.Headers.Add("Cache-Control", "private");
+
+            return File(content, "image/" + format);
+        }
+
+        [HttpGet("volume-cover")]
+        public async Task<ActionResult> GetVolumeCoverImage(int volumeId)
+        {
+            var volume = await _unitOfWork.SeriesRepository.GetVolumeAsync(volumeId);
+            var content = volume.CoverImage;
+            var format = "jpeg"; //Path.GetExtension("jpeg").Replace(".", "");
+            
+            // Calculates SHA1 Hash for byte[]
+            using var sha1 = new System.Security.Cryptography.SHA1CryptoServiceProvider();
+            Response.Headers.Add("ETag", string.Concat(sha1.ComputeHash(content).Select(x => x.ToString("X2"))));
+            Response.Headers.Add("Cache-Control", "private");
+
+            return File(content, "image/" + format);
+        }
+        
+        [HttpGet("series-cover")]
+        public async Task<ActionResult> GetSeriesCoverImage(int seriesId)
+        {
+            var series = await _unitOfWork.SeriesRepository.GetSeriesByIdAsync(seriesId);
+            var content = series.CoverImage;
+            var format = "jpeg"; //Path.GetExtension("jpeg").Replace(".", "");
+
+            if (content.Length == 0)
+            {
+                // How do I handle? 
+            }
+            
+            // Calculates SHA1 Hash for byte[]
+            using var sha1 = new System.Security.Cryptography.SHA1CryptoServiceProvider();
+            Response.Headers.Add("ETag", string.Concat(sha1.ComputeHash(content).Select(x => x.ToString("X2"))));
+            Response.Headers.Add("Cache-Control", "private");
+
+            return File(content, "image/" + format);
+        }
+    }
+}