public async Task DownloadImagesAsync_UnexistingImage_DownloadsAndSaves()
{
// Arrange
var metadata = new BingArchiveDto
{
Images = new []
{
new BingImagesArchiveDto
{
Url = "/th?id=myImage001.jpg"
}
}
};
string folderPath = "c:\\";
var streamMock = new Mock <Stream>();
_mocker.GetMock <IHttpAdapter>()
.Setup(x => x.GetStreamAsync(new Uri("https://www.bing.com/th?id=myImage001.jpg", UriKind.Absolute), It.IsAny <CancellationToken>()))
.Returns(Task.FromResult(streamMock.Object));
_mocker.GetMock <IFileStreamAdapter>()
.Setup(x => x.SaveAsync(streamMock.Object, "c:\\myImage001.jpg", It.IsAny <CancellationToken>()))
.Returns(Task.CompletedTask);
// Act
var images = (await _service.DownloadImagesAsync(metadata, folderPath)).ToList();
// Assert
Assert.Single(images);
Assert.Contains("c:\\myImage001.jpg", images);
}
public async Task DownloadImagesAsync_ExistingImage_DownloadsAndSaves()
{
// Arrange
string filePath = _temporalFiles.CreateTempFile();
string fileName = Path.GetFileName(filePath);
var metadata = new BingArchiveDto
{
Images = new[]
{
new BingImagesArchiveDto
{
Url = Invariant(@$ "/th?id={fileName}")
}
}
};
string folderPath = Path.GetTempPath();
var streamMock = new Mock <Stream>();
_mocker.GetMock <IHttpAdapter>()
.Setup(x => x.GetStreamAsync(new Uri("https://www.bing.com/th?id=myImage001.jpg", UriKind.Absolute), It.IsAny <CancellationToken>()))
.Returns(Task.FromResult(streamMock.Object));
// Act
var images = (await _service.DownloadImagesAsync(metadata, folderPath)).ToList();
// Assert
Assert.Empty(images);
}
public async Task DownloadMetadataAsync_ExistingId_GetsFromAdapter()
{
// Arrange
const int idx = 0;
_mocker.GetMock <IHttpAdapter>()
.Setup(x => x.GetFromJsonAsync <BingArchiveDto>("https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=10&mkt=en-US"))
.Returns(Task.FromResult(new BingArchiveDto()));
// Act
BingArchiveDto actual = await _service.DownloadMetadataAsync(idx);
// Assert
Assert.NotNull(actual);
}
public async Task <IEnumerable <string> > DownloadImagesAsync(BingArchiveDto metadata, string folderPath)
{
var cancellationTokenSource = new CancellationTokenSource();
var images = GetDownloadInfo(metadata, folderPath).ToList();
foreach ((Uri absoluteUri, string outputPath) in images)
{
try
{
var imageStream = await _httpAdapter.GetStreamAsync(absoluteUri, cancellationTokenSource.Token);
await _streamAdapter.SaveAsync(imageStream, outputPath, cancellationTokenSource.Token);
}
catch (Exception)
{
cancellationTokenSource.Cancel();
throw;
}
}
return(images.Select(x => x.OutputPath).ToList());
}
private static IEnumerable <(Uri AbsoluteUri, string OutputPath)> GetDownloadInfo(BingArchiveDto metadata, string folderPath)
{
const string FileNameKey = "id";
var baseUri = new Uri(BingBaseUrl, UriKind.Absolute);
return(metadata.Images.Select(x => new
{
AbsoluteUri = new Uri(baseUri, x.Url),
FileName = QueryStringParser.Parse(x.Url).TryGetValue(FileNameKey, out string id) ? id : null
})
