lay out boilerplate for new s3 integration

Unbinder/Services/S3Service.cs

@@ -0,0 +1,44 @@
+using Amazon;
+using Amazon.S3;
+using Amazon.S3.Transfer;
+using Amazon.Runtime;
+
+namespace Unbinder.Services
+{
+    public class S3Service
+    {
+        public static AWSCredentials Credentials => 
+            new BasicAWSCredentials(
+                Environment.GetEnvironmentVariable("AWS_ACCESS_KEY"),
+                Environment.GetEnvironmentVariable("AWS_SECRET_KEY"));
+
+        public static AmazonS3Client Client => new(Credentials, RegionEndpoint.USEast1);
+
+        public async Task<string?> UploadFileAsync(IFormFile file)
+        {
+            using IAmazonS3 client = Client;
+
+            if (file == null || file.Length == 0)
+            {
+                return null;
+            }
+
+            var bucketName = "unbinder-recipe-images";
+            var keyName = file.FileName;
+
+            using var fileTransferUtility = new TransferUtility(client);
+            await fileTransferUtility.UploadAsync(file.OpenReadStream(), bucketName, keyName);
+
+            return keyName;
+        }
+
+        public async Task GetFile(string path, string outFile)
+        {
+            using IAmazonS3 client = Client;
+
+            var bucketName = "unbinder-recipe-images";
+            using var fileTransferUtility = new TransferUtility(client);
+            await fileTransferUtility.DownloadAsync(outFile, bucketName, path);
+        }
+    }
+}

Unbinder/Unbinder.csproj

@@ -9,6 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="AWSSDK.S3" Version="3.7.300.4" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.0" NoWarn="NU1605" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.0" NoWarn="NU1605" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.0" />