public async Task FunctionHandler()

in Application/StepFunctions/thumbnail/Function.cs [37:73]
28 lines of code
1 McCabe index (conditional complexity)

        public async Task<ThumbnailInfo> FunctionHandler(Input input, ILambdaContext context)
        {
            var logger = new ImageRecognitionLogger(input, context);

            var size = input.ExtractedMetadata.Dimensions;

            var scalingFactor = Math.Min(
                MAX_WIDTH / size.Width,
                MAX_HEIGHT / size.Height
            );

            var width = Convert.ToInt32(scalingFactor * size.Width);
            var height = Convert.ToInt32(scalingFactor * size.Height);

            var image = await GenerateThumbnail(input.Bucket, input.SourceKey, width, height);

            var destinationKey = input.SourceKey.Replace("uploads", "resized");

            using (var stream = new MemoryStream())
            {
                await image.thumbnailImage.SaveAsync(stream, image.format);
                stream.Position = 0;

                context.Logger.LogLine($"Saving thumbnail to {destinationKey} with size {stream.Length}");
                await S3Client.PutObjectAsync(new PutObjectRequest
                {
                    BucketName = input.Bucket,
                    Key = destinationKey,
                    InputStream = stream
                });

                await logger.WriteMessageAsync(new MessageEvent {Message = "Photo thumbnail created"},
                    ImageRecognitionLogger.Target.All);

                return new ThumbnailInfo(width, height, destinationKey, input.Bucket);
            }
        }