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recursively follow redirects

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This commit is contained in:
Kyle Spearrin 2017-11-10 21:48:49 -05:00
parent 16e1e8d78e
commit 221f5fa154
1 changed files with 38 additions and 26 deletions
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64
src/Icons/Controllers/IconsController.cs
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@ -53,32 +53,7 @@ namespace Bit.Icons.Controllers
var iconUrl = $"{_iconsSettings.BestIconBaseUrl}/icon?url={mappedDomain}&size=16..32..200" +
$"&fallback_icon_url=https://raw.githubusercontent.com/bitwarden/web/master/src/images/fa-globe.png";
var response = await _httpClient.GetAsync(iconUrl);
if(response.StatusCode == HttpStatusCode.Redirect && response.Headers.Contains("Location"))
{
var locationHeader = response.Headers.GetValues("Location").FirstOrDefault();
if(!string.IsNullOrWhiteSpace(locationHeader) &&
Uri.TryCreate(locationHeader, UriKind.Absolute, out Uri location))
{
var message = new HttpRequestMessage
{
RequestUri = location,
Method = HttpMethod.Get
};
// Let's add some headers to look like we're coming from a web browser request. Some websites
// will block our request without these.
message.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36");
message.Headers.Add("Accept-Language", "en-US,en;q=0.8");
message.Headers.Add("Cache-Control", "no-cache");
message.Headers.Add("Pragma", "no-cache");
message.Headers.Add("Accept", "image/webp,image/apng,image/*,*/*;q=0.8");
response = await _httpClient.SendAsync(message);
}
}
response = await FollowRedirectsAsync(response, 1);
if(!response.IsSuccessStatusCode)
{
return new NotFoundResult();
@ -103,5 +78,42 @@ namespace Bit.Icons.Controllers
return new FileContentResult(icon.Image, icon.Format);
}
private async Task<HttpResponseMessage> FollowRedirectsAsync(HttpResponseMessage response, int followCount)
{
if(response.IsSuccessStatusCode || followCount > 2)
{
return response;
}
if((response.StatusCode == HttpStatusCode.Redirect || response.StatusCode == HttpStatusCode.MovedPermanently) &&
response.Headers.Contains("Location"))
{
var locationHeader = response.Headers.GetValues("Location").FirstOrDefault();
if(!string.IsNullOrWhiteSpace(locationHeader) &&
Uri.TryCreate(locationHeader, UriKind.Absolute, out Uri location))
{
var message = new HttpRequestMessage
{
RequestUri = location,
Method = HttpMethod.Get
};
// Let's add some headers to look like we're coming from a web browser request. Some websites
// will block our request without these.
message.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36");
message.Headers.Add("Accept-Language", "en-US,en;q=0.8");
message.Headers.Add("Cache-Control", "no-cache");
message.Headers.Add("Pragma", "no-cache");
message.Headers.Add("Accept", "image/webp,image/apng,image/*,*/*;q=0.8");
response = await _httpClient.SendAsync(message);
response = await FollowRedirectsAsync(response, followCount++);
}
}
return response;
}
}
}