public static bool IsRequestShouldBePrerendered(RequestParams requestParams, PrerenderConfig config)
{
// Check '_escaped_fragment_' query string parameter
if(!string.IsNullOrEmpty(requestParams.RequestUri.Query) &&
requestParams.RequestUri.Query.Contains(EscapedQueryStringParameterName))
{
return true;
}
// Check ignore file extentions
var extention = Path.GetExtension(requestParams.RequestUri.AbsoluteUri);
if (!string.IsNullOrEmpty(extention))
{
for (int i = 0; i < config.Configuration.IgnoreExtentions.Count; i++)
{
var extentionElm = config.Configuration.IgnoreExtentions[i];
if (string.Equals(extentionElm.Extention, extention, StringComparison.OrdinalIgnoreCase))
{
return false;
}
}
}
// Check crawler user agent
for (int i = 0; i < config.Configuration.Crawlers.Count; i++)
{
var crawlerElm = config.Configuration.Crawlers[i];
if (crawlerElm.IsMatch(requestParams.UserAgent))
return true;
}
return false;
}
public void TestCorrectPrerenderingIgnoredFile()
{
var requestUrl = "http://localhost:4434/myfile.html";
var userAgent = "Googlebot";
var requestParams = new RequestParams
{
RequestUri = new Uri(requestUrl),
UserAgent = userAgent
};
Assert.IsFalse(Utility.IsRequestShouldBePrerendered(requestParams, _config));
requestParams.UserAgent = "chrome";
Assert.IsFalse(Utility.IsRequestShouldBePrerendered(requestParams, _config));
}
public void TestCorrectRobotRequestDetection()
{
var requestUrl = "http://localhost:4434/path/to/resource?q=2";
var userAgent = "chrome";
var requestParams = new RequestParams
{
RequestUri = new Uri(requestUrl),
UserAgent = userAgent
};
Assert.IsFalse(Utility.IsRequestShouldBePrerendered(requestParams, _config));
requestParams.UserAgent = "Googlebot";
Assert.IsTrue(Utility.IsRequestShouldBePrerendered(requestParams, _config));
requestParams.UserAgent = "Googlebot-Mobile";
Assert.IsTrue(Utility.IsRequestShouldBePrerendered(requestParams, _config));
}
public override async Task Invoke(IOwinContext context)
{
var config = PrerenderConfig.GetCurrent();
var requestParams = new RequestParams
{
RequestUri = context.Request.Uri,
UserAgent = context.Request.Headers["user-agent"]
};
if (Utility.IsRequestShouldBePrerendered(requestParams, config))
{
var rendererConfig = new WebConfigPrerenderServiceConfiguration(config);
var renderer = new SnapshotRenderer(rendererConfig);
var snapshotUrl = Utility.GetSnapshotUrl(context.Request.Uri);
//render page html
PrerenderResult response;
try
{
response = await renderer.RenderPage(snapshotUrl);
}
catch (WebException e)
{
context.Response.Write(string.Format("Failed to prerender request '{0}'. Error message: '{1}'. Stack trace: '{2}'", snapshotUrl, e.Message, e.StackTrace));
context.Response.StatusCode = 500;
return;
}
await context.Response.WriteAsync(response.Content);
context.Response.ContentType = "text/html";
context.Response.StatusCode = (int)response.StatusCode;
}
else
{
await Next.Invoke(context);
}
}
public void TestCorrectRobotRequestDetectionByFragment()
{
var requestUrl = "http://localhost:4434/?q=2&_escaped_fragment_=/about";
var userAgent = "Googlebot";
var requestParams = new RequestParams
{
RequestUri = new Uri(requestUrl),
UserAgent = userAgent
};
Assert.IsTrue(Utility.IsRequestShouldBePrerendered(requestParams, _config));
}