#229 Resize cover Images if requested

Tranga/Server/Server.cs

@@ -200,43 +200,31 @@ public partial class Server : GlobalBase, IDisposable
         response.AddHeader("Access-Control-Max-Age", "1728000");
         response.AppendHeader("Access-Control-Allow-Origin", "*");
 
-        if (content is not Stream)
+
+        try
         {
-            response.ContentType = "application/json";
-            try
+            if (content is Stream stream)
             {
+                response.ContentType = "image/jpeg";
+                response.AddHeader("Cache-Control", "max-age=600");
+                stream.CopyTo(response.OutputStream);
+                response.OutputStream.Close();
+                stream.Close();
+            }
+            else
+            {
+                response.ContentType = "application/json";
+                response.AddHeader("Cache-Control", "no-store");
                 response.OutputStream.Write(content is not null
                     ? Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(content))
                     : Array.Empty<byte>());
-                response.OutputStream.Close();
             }
-            catch (HttpListenerException e)
-            {
-                Log(e.ToString());
-            }
-        }
-        else if(content is FileStream stream)
-        {
-            string contentType = stream.Name.Split('.')[^1];
-            switch (contentType.ToLower())
-            {
-                case "gif":
-                    response.ContentType = "image/gif";
-                    break;
-                case "png":
-                    response.ContentType = "image/png";
-                    break;
-                case "jpg":
-                case "jpeg":
-                    response.ContentType = "image/jpeg";
-                    break;
-                default:
-                    response.ContentType = "text/plain";
-                    break;
-            }
-            stream.CopyTo(response.OutputStream);
+
             response.OutputStream.Close();
-            stream.Close();
+        }
+        catch (HttpListenerException e)
+        {
+            Log(e.ToString());
         }
     }
 

Tranga/Server/v2Manga.cs

@@ -1,4 +1,6 @@
-using System.Net;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Net;
 using System.Text.RegularExpressions;
 using Tranga.Jobs;
 using Tranga.MangaConnectors;
@@ -77,12 +79,37 @@ public partial class Server
            manga is null)
             return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.NotFound, $"Manga with ID '{groups[1].Value} could not be found.'");
         string filePath = manga.Value.coverFileNameInCache!;
-        if (File.Exists(filePath))
+        if(!File.Exists(filePath))
+            return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.NotFound, "Cover-File not found.");
+
+        Bitmap bitmap;
+        if (requestParameters.TryGetValue("dimensions", out string? dimensionsStr))
+        {
+            Regex dimensionsRex = new(@"([0-9]+)x([0-9]+)");
+            if(!dimensionsRex.IsMatch(dimensionsStr))
+                return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.BadRequest, "Requested dimensions not in required format.");
+            Match m = dimensionsRex.Match(dimensionsStr);
+            int width = int.Parse(m.Groups[1].Value);
+            int height = int.Parse(m.Groups[2].Value);
+            double aspectRequested = (double)width / (double)height;
+            
+            using Image coverImage = Image.FromFile(filePath);
+            double aspectCover = (double)coverImage.Width / (double)coverImage.Height;
+
+            Size newSize = aspectRequested > aspectCover
+                ? new Size(width, (width / coverImage.Width) * coverImage.Height)
+                : new Size((height / coverImage.Height) * coverImage.Width, height);
+
+            bitmap = new(coverImage, newSize);
+        }
+        else
         {
             FileStream coverStream = new(filePath, FileMode.Open);
-            return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.OK, coverStream);
+            bitmap = new(coverStream);
         }
-        return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.NotFound, "Cover-File not found.");
+        using MemoryStream ret = new();
+        bitmap.Save(ret, ImageFormat.Jpeg);
+        return new ValueTuple<HttpStatusCode, object?>(HttpStatusCode.OK, ret);
     }
     
     private ValueTuple<HttpStatusCode, object?> GetV2MangaInternalIdChapters(GroupCollection groups, Dictionary<string, string> requestParameters)

Tranga/Tranga.csproj

@@ -13,6 +13,7 @@
       <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
       <PackageReference Include="PuppeteerSharp" Version="10.0.0" />
       <PackageReference Include="Soenneker.Utils.String.NeedlemanWunsch" Version="2.1.301" />
+      <PackageReference Include="System.Drawing.Common" Version="9.0.0-preview.7.24405.4" />
     </ItemGroup>
 
     <ItemGroup>

docs/API_Calls_v2.md

@@ -186,12 +186,16 @@ Returns the URL for the Cover of the specified Manga.
   * [GET /v2/Manga](#-v2manga)
   * [GET /v2/Connector/*ConnectorName*/GetManga](#-v2connectorconnectornamegetmanga)
   * [GET /v2/Job/*jobId*](#-v2jobjobid)
+
+  Optional: `dimensions=<width>x<height>` replace width and height with requested dimensions in pixels.
+  Fitting will cover requested area.
 </details>
 
 <details>
   <summary>Returns</summary>
 
 String with the url.
+If `dimensions=x` was not requested, returns full sized image.
   
   | StatusCode | Meaning                                    |
   |------------|--------------------------------------------|