initial commit

Api/RepositoryApi.cs

@@ -0,0 +1,180 @@
+using BitMiracle.LibTiff.Classic;
+using Microsoft.AspNetCore.Mvc;
+using SkiaSharp;
+using System.Buffers.Text;
+using Microsoft.Data.SqlClient;
+using System.IO;
+
+namespace Library.Api;
+
+[Route( "Api/Repository/[action]/{id?}" )]
+public class RepositoryApi : APIController
+{
+	public RepositoryApi( ILogger<UserApi> logger , IConfiguration configuration )
+		: base( logger , configuration )
+	{
+	}
+
+	[HttpPost]
+	[DisableRequestSizeLimit]
+	public IActionResult UploadCoverImage( int id , List<IFormFile>? file )
+	{
+		Trace( "/Api/Repository/UploadCoverImage" );
+		if ( file == null || file.Count <= 0 )
+			return Error( "Missing file" );
+
+		using SKBitmap? bitmap = PreprocessImage( file[0] );
+		if ( bitmap == null )
+			return Error( "Invalid image" );
+
+		SqlDataReader reader = PrepareSQL(@"update gnm set uuid = REPLACE(NEWID( ),'-',''),data_format='jpg' OUTPUT INSERTED.uuid WHERE id = @id")
+			.AddParameter( "@id" , id )
+			.ExecuteReader( );
+
+		if ( !reader.Read( ) )
+			return Error( "No such book!" );
+
+		string? new_uuid = reader.String( 0 );
+		if ( string.IsNullOrEmpty( new_uuid ) )
+			return Error( "No such book!" );
+
+		string original = GetDataDirectory( ) + new_uuid + ".jpg";
+
+		using SKData bitmap_data = bitmap.Encode( SKEncodedImageFormat.Jpeg , 80 );
+		byte [] bitmap_data_array = bitmap_data.ToArray( );
+		System.IO.File.WriteAllBytes( original , bitmap_data_array );
+
+		return Success( new_uuid );
+	}
+
+	[HttpPost]
+	[DisableRequestSizeLimit]
+	public IActionResult UploadPDFAttachment( int id , List<IFormFile>? file )
+	{
+		Trace( "/Api/Repository/UploadPDFAttachment" );
+		if ( file == null || file.Count <= 0 )
+			return Error( "Missing file" );
+
+		byte [] ? pdf_data_array = PreprocessPDF( file[0] );
+		if ( pdf_data_array == null )
+			return Error( "Invalid file" );
+
+		SqlDataReader reader = PrepareSQL(@"update gnm_rec set uuid = REPLACE(NEWID( ),'-',''),data_format='pdf' OUTPUT INSERTED.uuid WHERE id = @id")
+			.AddParameter( "@id" , id )
+			.ExecuteReader( );
+
+		if ( !reader.Read( ) )
+			return Error( "No such attachment!" );
+
+		string? new_uuid = reader.String( 0 );
+		if ( string.IsNullOrEmpty( new_uuid ) )
+			return Error( "No such attachment!" );
+
+		string original = GetDataDirectory( ) + new_uuid + ".pdf";
+		System.IO.File.WriteAllBytes( original , pdf_data_array );
+
+		return Success( new_uuid );
+	}
+
+	[HttpPost]
+	[DisableRequestSizeLimit]
+	public IActionResult UploadImageAttachment( int id , List<IFormFile>? file )
+	{
+		Trace( "/Api/Repository/UploadImageAttachment" );
+		if ( file == null || file.Count <= 0 )
+			return Error( "Missing file" );
+
+		using SKBitmap? bitmap = PreprocessImage( file[0] );
+		if ( bitmap == null )
+			return Error( "Invalid image" );
+
+		SqlDataReader reader = PrepareSQL(@"update gnm_rec set uuid = REPLACE(NEWID( ),'-',''),data_format='jpg' OUTPUT INSERTED.uuid WHERE id = @id")
+			.AddParameter( "@id" , id )
+			.ExecuteReader( );
+
+		if ( !reader.Read( ) )
+			return Error( "No such attachment!" );
+
+		string? new_uuid = reader.String( 0 );
+		if ( string.IsNullOrEmpty( new_uuid ) )
+			return Error( "No such attachment!" );
+
+		string original = GetDataDirectory( ) + new_uuid + ".jpg";
+
+		using SKData bitmap_data = bitmap.Encode( SKEncodedImageFormat.Jpeg , 80 );
+		byte [] bitmap_data_array = bitmap_data.ToArray( );
+		System.IO.File.WriteAllBytes( original , bitmap_data_array );
+
+		return Success( new_uuid );
+	}
+
+
+	private static SKBitmap? PreprocessImage( IFormFile form_file )
+	{
+		SKBitmap? bitmap = SKBitmap.Decode( form_file.OpenReadStream( ) );
+		if ( bitmap == null )
+		{
+			bitmap = ConvertTiffToSKBitmap( form_file.OpenReadStream( ) );
+			if ( bitmap == null )
+				return null;
+		}
+
+		if ( bitmap!.IsEmpty || bitmap.IsNull || bitmap.Width < 16 || bitmap.Height < 16 )
+			return null;
+
+		return bitmap;
+	}
+
+	private static byte[]? PreprocessPDF( IFormFile form_file )
+	{
+		using MemoryStream file_contents = new( );
+		form_file.CopyTo( file_contents );
+
+		byte[] file_bytes = file_contents.ToArray( );
+		if ( file_bytes.Length < 10 )
+			return null;
+
+		if ( file_bytes[0] != (byte)'%' || file_bytes[1] != (byte)'P' || file_bytes[2] != 'D' || file_bytes[3] != 'F' )
+			return null;
+
+
+		return file_bytes;
+	}
+
+	public static SKBitmap? ConvertTiffToSKBitmap( Stream tifImage )
+	{
+		SKColor[] pixels;
+		int width, height;
+		// open a Tiff stored in the memory stream, and grab its pixels
+		using ( Tiff tifImg = Tiff.ClientOpen( "in-memory" , "r" , tifImage , new TiffStream( ) ) )
+		{
+			FieldValue[] value = tifImg.GetField(TiffTag.IMAGEWIDTH);
+			width = value[0].ToInt( );
+
+			value = tifImg.GetField( TiffTag.IMAGELENGTH );
+			height = value[0].ToInt( );
+
+			// Read the image into the memory buffer 
+			int[] raster = new int[width * height];
+			if ( !tifImg.ReadRGBAImageOriented( width , height , raster , Orientation.TOPLEFT ) )
+			{
+				// Not a valid TIF image.
+			}
+			// store the pixels
+			pixels = new SKColor[width * height];
+			for ( int y = 0 ; y < height ; y++ )
+			{
+				for ( int x = 0 ; x < width ; x++ )
+				{
+					int arrayOffset = y * width + x;
+					int rgba = raster[arrayOffset];
+					pixels[arrayOffset] = new SKColor( (byte)Tiff.GetR( rgba ) , (byte)Tiff.GetG( rgba ) , (byte)Tiff.GetB( rgba ) , (byte)Tiff.GetA( rgba ) );
+				}
+			}
+		}
+		
+		return new SKBitmap( width , height ) {
+			Pixels = pixels
+		};
+	}
+}