private static IDownload FetchWithoutCorsAsync(this IResourceLoader loader, ResourceRequest request, OriginBehavior behavior)
{
if (behavior == OriginBehavior.Fail)
{
throw new DomException(DomError.Network);
}
return(loader.FetchAsync(request));
}
/// <summary>
/// Processes the given request asynchronously.
/// </summary>
public virtual Task ProcessAsync(ResourceRequest request)
{
if (IsAvailable && IsDifferentToCurrentDownloadUrl(request.Target))
{
CancelDownload();
Download = _loader.FetchAsync(request);
return(FinishDownloadAsync());
}
return(null);
}
private static IDownload FetchFromDifferentOriginAsync(this IResourceLoader loader, CorsRequest cors)
{
var request = cors.Request;
request.IsCredentialOmitted = cors.IsAnonymous();
var download = loader.FetchAsync(request);
return(download.Wrap(response =>
{
if (response?.StatusCode != HttpStatusCode.OK)
{
response?.Dispose();
throw new DomException(DomError.Network);
}
return cors.CheckIntegrity(download);
}));
}
private static IDownload FetchFromSameOriginAsync(this IResourceLoader loader, Url url, CorsRequest cors)
{
var request = cors.Request;
var download = loader.FetchAsync(new ResourceRequest(request.Source, url)
{
Origin = request.Origin,
IsManualRedirectDesired = true
});
return(download.Wrap(response =>
{
if (response.IsRedirected())
{
url.Href = response.Headers.GetOrDefault(HeaderNames.Location, url.Href);
return request.Origin.Is(url.Origin) ?
loader.FetchWithCorsAsync(cors.RedirectTo(url)) :
loader.FetchFromSameOriginAsync(url, cors);
}
return cors.CheckIntegrity(download);
}));
}
/// <summary>
/// Performs a potentially CORS-enabled fetch from the given URI by
/// using an asynchronous GET request. For more information see:
/// http://www.w3.org/TR/html5/infrastructure.html#potentially-cors-enabled-fetch
/// </summary>
/// <param name="loader">The resource loader to use.</param>
/// <param name="request">The request to issue.</param>
/// <param name="setting">The cross origin settings to use.</param>
/// <param name="behavior">
/// The default behavior in case it is undefined.
/// </param>
/// <param name="cancel">
/// The token which can be used to cancel the request.
/// </param>
/// <returns>
/// The task which will eventually return the stream.
/// </returns>
public static async Task <IResponse> FetchWithCorsAsync(this IResourceLoader loader, ResourceRequest request, CorsSetting setting, OriginBehavior behavior, CancellationToken cancel)
{
if (loader == null)
{
return(null);
}
var url = request.Target;
if (request.Origin == url.Origin || url.Scheme == KnownProtocols.Data || url.Href == "about:blank")
{
while (true)
{
var data = new ResourceRequest(request.Source, url)
{
Origin = request.Origin,
IsManualRedirectDesired = true
};
var result = await loader.LoadAsync(data, cancel).ConfigureAwait(false);
if (result.StatusCode == HttpStatusCode.Redirect ||
result.StatusCode == HttpStatusCode.RedirectKeepVerb ||
result.StatusCode == HttpStatusCode.RedirectMethod ||
result.StatusCode == HttpStatusCode.TemporaryRedirect ||
result.StatusCode == HttpStatusCode.MovedPermanently ||
result.StatusCode == HttpStatusCode.MultipleChoices)
{
url = new Url(result.Headers.GetOrDefault(HeaderNames.Location, url.Href));
if (request.Origin == url.Origin)
{
request = new ResourceRequest(request.Source, url)
{
IsCookieBlocked = request.IsCookieBlocked,
IsSameOriginForced = request.IsSameOriginForced,
Origin = request.Origin
};
return(await loader.FetchWithCorsAsync(request, setting, behavior, cancel).ConfigureAwait(false));
}
}
else
{
return(result);
}
}
}
else if (setting == CorsSetting.None)
{
if (behavior == OriginBehavior.Fail)
{
throw new DomException(DomError.Network);
}
return(await loader.LoadAsync(request, cancel).ConfigureAwait(false));
}
else if (setting == CorsSetting.Anonymous || setting == CorsSetting.UseCredentials)
{
request.IsCredentialOmitted = setting == CorsSetting.Anonymous;
var result = await loader.FetchAsync(request, cancel).ConfigureAwait(false);
if (result != null && result.StatusCode == HttpStatusCode.OK)
{
return(result);
}
else if (result != null)
{
result.Dispose();
}
}
throw new DomException(DomError.Network);
}
/// <summary>
/// Performs a potentially CORS-enabled fetch from the given URI by
/// using an asynchronous GET request. For more information see:
/// http://www.w3.org/TR/html5/infrastructure.html#potentially-cors-enabled-fetch
/// </summary>
/// <param name="loader">The resource loader to use.</param>
/// <param name="request">The request to issue.</param>
/// <param name="setting">The cross origin settings to use.</param>
/// <param name="behavior">
/// The default behavior in case it is undefined.
/// </param>
/// <returns>
/// The task which will eventually return the stream.
/// </returns>
public static async Task <IResponse> FetchWithCorsAsync(this IResourceLoader loader, ResourceRequest request, CorsSetting setting, OriginBehavior behavior)
{
var url = request.Target;
if (request.Origin == url.Origin || url.Scheme == ProtocolNames.Data || url.Href == "about:blank")
{
while (true)
{
var data = new ResourceRequest(request.Source, url)
{
Origin = request.Origin,
IsManualRedirectDesired = true
};
var result = await loader.DownloadAsync(data).Task.ConfigureAwait(false);
if (result.IsRedirected())
{
url = new Url(result.Headers.GetOrDefault(HeaderNames.Location, url.Href));
if (request.Origin.Is(url.Origin))
{
request = new ResourceRequest(request.Source, url)
{
IsCookieBlocked = request.IsCookieBlocked,
IsSameOriginForced = request.IsSameOriginForced,
Origin = request.Origin
};
return(await loader.FetchWithCorsAsync(request, setting, behavior).ConfigureAwait(false));
}
}
else
{
return(result);
}
}
}
else if (setting == CorsSetting.None)
{
if (behavior == OriginBehavior.Fail)
{
throw new DomException(DomError.Network);
}
return(await loader.DownloadAsync(request).Task.ConfigureAwait(false));
}
else if (setting == CorsSetting.Anonymous || setting == CorsSetting.UseCredentials)
{
request.IsCredentialOmitted = setting == CorsSetting.Anonymous;
var result = await loader.FetchAsync(request).ConfigureAwait(false);
if (result != null && result.StatusCode == HttpStatusCode.OK)
{
return(result);
}
else if (result != null)
{
result.Dispose();
}
}
throw new DomException(DomError.Network);
}
