private async Task <IEnumerable <Image> > ConvertToImages(GetByEarthDateResponse resposne)
{
var convertToImageTasks = resposne.photos.Select(async photo => new Image
{
Data = await _imageDownloader.FetchImage(new Uri(photo.img_src)),
Name = photo.id.ToString(),
Extention = ImageFileExtension.From(photo.img_src.Split('.').Last())
});
return(await Task.WhenAll(convertToImageTasks));
}
public static bool IsValidImageFile(byte[] bytFile, String fileContentType)
{
bool isvalid = false;
byte[] chkBytejpg = { 255, 216, 255, 224 };
byte[] chkBytebmp = { 66, 77 };
byte[] chkBytegif = { 71, 73, 70, 56 };
byte[] chkBytepng = { 137, 80, 78, 71 };
ImageFileExtension imgfileExtn = ImageFileExtension.none;
if (fileContentType.Contains("jpg") | fileContentType.Contains("jpeg"))
{
imgfileExtn = ImageFileExtension.jpg;
}
else if (fileContentType.Contains("png"))
{
imgfileExtn = ImageFileExtension.png;
}
else if (fileContentType.Contains("bmp"))
{
imgfileExtn = ImageFileExtension.bmp;
}
else if (fileContentType.Contains("gif"))
{
imgfileExtn = ImageFileExtension.gif;
}
if (imgfileExtn == ImageFileExtension.jpg || imgfileExtn == ImageFileExtension.jpeg)
{
if (bytFile.Length >= 4)
{
int j = 0;
for (Int32 i = 0; i <= 3; i++)
{
if (bytFile[i] == chkBytejpg[i])
{
j = j + 1;
if (j == 3)
{
isvalid = true;
}
}
}
}
}
if (imgfileExtn == ImageFileExtension.png)
{
if (bytFile.Length >= 4)
{
int j = 0;
for (Int32 i = 0; i <= 3; i++)
{
if (bytFile[i] == chkBytepng[i])
{
j = j + 1;
if (j == 3)
{
isvalid = true;
}
}
}
}
}
if (imgfileExtn == ImageFileExtension.bmp)
{
if (bytFile.Length >= 4)
{
int j = 0;
for (Int32 i = 0; i <= 1; i++)
{
if (bytFile[i] == chkBytebmp[i])
{
j = j + 1;
if (j == 2)
{
isvalid = true;
}
}
}
}
}
if (imgfileExtn == ImageFileExtension.gif)
{
if (bytFile.Length >= 4)
{
int j = 0;
for (Int32 i = 0; i <= 1; i++)
{
if (bytFile[i] == chkBytegif[i])
{
j = j + 1;
if (j == 3)
{
isvalid = true;
}
}
}
}
}
return(isvalid);
}
public void ImageFileExtension_GivenInvalidImageExtension_ShouldThrowException()
{
Assert.Throws <ImageFileExtensionInvalidException>(() => ImageFileExtension.From("invalidExtension"));
}
public void ImageFileExtension_GivenValidImageExtension_ShouldNotThrowException(string imageExtension)
{
var exception = Record.Exception(() => ImageFileExtension.From(imageExtension));
Assert.Null(exception);
}
