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HttpResourceHandler.cs
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64 lines (51 loc) · 2.4 KB
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using System.IO;
using System.Net;
using System.Threading.Tasks;
using Xilium.CefGlue;
using Xilium.CefGlue.Common.Handlers;
namespace WebViewControl {
internal class HttpResourceHandler : DefaultResourceHandler {
private const string AccessControlAllowOriginHeaderKey = "Access-Control-Allow-Origin";
internal static readonly CefResourceType[] AcceptedResources = new CefResourceType[] {
// These resources types need an "Access-Control-Allow-Origin" header response entry
// to comply with CORS security restrictions.
CefResourceType.SubFrame,
CefResourceType.FontResource,
CefResourceType.Stylesheet
};
protected override RequestHandlingFashion ProcessRequestAsync(CefRequest request, CefCallback callback) {
Task.Run(async () => {
try {
var httpRequest = WebRequest.CreateHttp(request.Url);
var headers = request.GetHeaderMap();
foreach (var key in headers.AllKeys) {
httpRequest.Headers.Add(key, headers[key]);
}
var response = (HttpWebResponse) await httpRequest.GetResponseAsync();
Response = response.GetResponseStream();
Headers = response.Headers;
MimeType = response.ContentType;
Status = (int) response.StatusCode;
StatusText = response.StatusDescription;
// we have to smash any existing value here
Headers.Remove(AccessControlAllowOriginHeaderKey);
Headers.Add(AccessControlAllowOriginHeaderKey, "*");
} catch {
// we should catch exceptions.. network errors cannot crash the app
} finally {
callback.Continue();
}
});
return RequestHandlingFashion.ContinueAsync;
}
protected override bool Read(Stream outResponse, int bytesToRead, out int bytesRead, CefResourceReadCallback callback) {
var buffer = new byte[bytesToRead];
bytesRead = Response?.Read(buffer, 0, buffer.Length) ?? 0;
if (bytesRead == 0) {
return false;
}
outResponse.Write(buffer, 0, bytesRead);
return bytesRead > 0;
}
}
}