From 6c5bc3685e0df69e58b68293863675dbfaf1a7f8 Mon Sep 17 00:00:00 2001
From: Glax <johanna@bernloehr.eu>
Date: Fri, 7 Mar 2025 14:29:25 +0100
Subject: [PATCH] #229 Resize cover-images on request before transfer

---
 API/Controllers/MangaController.cs | 23 +++++++++++++++++++++--
 API/CoverFormatRequestRecord.cs    | 14 ++++++++++++++
 API/Program.cs                     |  6 +++++-
 3 files changed, 40 insertions(+), 3 deletions(-)
 create mode 100644 API/CoverFormatRequestRecord.cs

diff --git a/API/Controllers/MangaController.cs b/API/Controllers/MangaController.cs
index e05d155..9f838c5 100644
--- a/API/Controllers/MangaController.cs
+++ b/API/Controllers/MangaController.cs
@@ -1,8 +1,11 @@
 using API.Schema;
 using Asp.Versioning;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.Formats.Jpeg;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Processing.Processors.Transforms;
 using static Microsoft.AspNetCore.Http.StatusCodes;
 
 namespace API.Controllers;
@@ -88,14 +91,18 @@ public class MangaController(PgsqlContext context) : Controller
     /// Returns Cover of Manga
     /// </summary>
     /// <param name="id">Manga-ID</param>
+    /// <param name="formatRequest">Formatting/Resizing Request</param>
     /// <response code="200">JPEG Image</response>
     /// <response code="204">Cover not loaded</response>
+    /// <response code="400">The formatting-request was invalid</response>
     /// <response code="404">Manga with ID not found</response>
-    [HttpGet("{id}/Cover")]
+    [HttpPost("{id}/Cover")]
+    [Produces("image/jpeg")]
     [ProducesResponseType(Status200OK)]
     [ProducesResponseType(Status204NoContent)]
+    [ProducesResponseType(Status400BadRequest)]
     [ProducesResponseType(Status404NotFound)]
-    public IActionResult GetCover(string id)
+    public IActionResult GetCover(string id, [FromBody(EmptyBodyBehavior = EmptyBodyBehavior.Allow)]CoverFormatRequestRecord? formatRequest)
     {
         Manga? m = context.Manga.Find(id);
         if (m is null)
@@ -104,6 +111,18 @@ public class MangaController(PgsqlContext context) : Controller
             return NoContent();
 
         Image image = Image.Load(m.CoverFileNameInCache);
+
+        if (formatRequest is not null)
+        {
+            if(!formatRequest.Validate())
+                return BadRequest();
+            image.Mutate(i => i.ApplyProcessor(new ResizeProcessor(new ResizeOptions()
+            {
+                Mode = ResizeMode.Max,
+                Size = formatRequest.size
+            }, image.Size)));
+        }
+        
         using MemoryStream ms = new();
         image.Save(ms, new JpegEncoder(){Quality = 100});
         return File(ms.GetBuffer(), "image/jpeg");
diff --git a/API/CoverFormatRequestRecord.cs b/API/CoverFormatRequestRecord.cs
new file mode 100644
index 0000000..429761a
--- /dev/null
+++ b/API/CoverFormatRequestRecord.cs
@@ -0,0 +1,14 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats;
+
+namespace API;
+
+public record CoverFormatRequestRecord(Size size)
+{
+    public bool Validate()
+    {
+        if (size.Height <= 0 || size.Width <= 0 || size.Height > 65535 || size.Width > 65535) //JPEG max size
+            return false;
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/API/Program.cs b/API/Program.cs
index fe444af..a1c9635 100644
--- a/API/Program.cs
+++ b/API/Program.cs
@@ -57,7 +57,11 @@ builder.Services.AddDbContext<PgsqlContext>(options =>
                       $"Username={Environment.GetEnvironmentVariable("POSTGRES_USER")??"postgres"}; " +
                       $"Password={Environment.GetEnvironmentVariable("POSTGRES_PASSWORD")??"postgres"}"));
 
-builder.Services.AddControllers().AddNewtonsoftJson(opts =>
+builder.Services.AddControllers(options =>
+    {
+        options.AllowEmptyInputInBodyModelBinding = true;
+    })
+    .AddNewtonsoftJson(opts =>
 {
     opts.SerializerSettings.Converters.Add(new StringEnumConverter());
 });