[FA-5] FileService setup, build scripts tweaked to be easier to maintain

FictionArchive.Service.FileService/Controllers/S3ProxyController.cs

@@ -0,0 +1,49 @@
+using System.Web;
+using Amazon.S3;
+using Amazon.S3.Model;
+using FictionArchive.Service.FileService.Models;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+
+namespace FictionArchive.Service.FileService.Controllers
+{
+    [Route("api/{*path}")]
+    [ApiController]
+    public class S3ProxyController : ControllerBase
+    {
+        private readonly AmazonS3Client _amazonS3Client;
+        private readonly S3Configuration _s3Configuration;
+
+        public S3ProxyController(AmazonS3Client amazonS3Client, IOptions<S3Configuration> s3Configuration)
+        {
+            _amazonS3Client = amazonS3Client;
+            _s3Configuration = s3Configuration.Value;
+        }
+
+        [HttpGet]
+        public async Task<IActionResult> Get(string path)
+        {
+            var decodedPath = HttpUtility.UrlDecode(path);
+
+            try
+            {
+                var s3Response = await _amazonS3Client.GetObjectAsync(new GetObjectRequest()
+                {
+                    BucketName = _s3Configuration.Bucket,
+                    Key = decodedPath
+                });
+            
+                return new FileStreamResult(s3Response.ResponseStream, s3Response.Headers.ContentType);
+            }
+            catch (AmazonS3Exception e)
+            {
+                if (e.Message == "Key not found")
+                {
+                    return NotFound();
+                }
+                throw;
+            }
+        }
+    }
+}