public void HandleRequest(IInterceptedRequest request)
{
_logger.Information("Intercepting request {RequestId} HTTP {Method} {Url}", request.RequestId, request.HttpMethod, request.Url);
if (request.HttpMethod == "POST" && request.Stream.Length > 0)
{
using (var reader = new StreamReader(request.Stream))
{
// get original content
var content = reader.ReadToEnd();
_logger.Information("Received content {Content}", content);
// modify content
content = $"{{ \"modified\": true, \"receivedContent\": {content} }}";
request.Stream = new MemoryStream(Encoding.UTF8.GetBytes(content))
{
Position = 0
};
// Correct Content-Length header
var headers = request.CloneHttpHeaders();
if (headers.ContainsKey("Content-Length"))
{
headers["Content-Length"] = request.Stream.Length.ToString();
}
request.HttpHeaders = headers;
}
}
}
/// <summary>
/// This method can modify the request and prevent further processing by returning an <see cref="HttpResponseMessage"/>.
/// </summary>
/// <param name="request">The request that can be modified.</param>
/// <returns>If the returned <see cref="HttpResponseMessage"/> is not null then it will immediately be send out to the client without any further processing.</returns>
public HttpResponseMessage OnRequestReceived(IInterceptedRequest request)
{
_logger?.Debug($"{nameof(DemoRequestInterceptor)}.{nameof(OnRequestReceived)} is called.");
// Example: Set Request expiration
if (request.HttpHeaders.TryGetValue("Request-Expiration", out var expirationValue) && TimeSpan.TryParse(expirationValue, out var expiration))
{
_logger?.Information("Interceptor is setting RabbitMQ TTL to {RequestExpiration} for Request {RequestId}", expiration, request.RequestId);
request.Expiration = expiration;
return(null);
}
// Example: Set AcknowledgmentMode
if (request.HttpHeaders.TryGetValue("Acknowledgment-Mode", out var ackModeValue) && Enum.TryParse(ackModeValue, out AcknowledgmentMode ackMode))
{
// This request will be auto-acknowledged when taken out of RabbitMQ.
// When there is a problem with SignalR or the OnPremiseConnector, this request may not reach the remote API.
request.AcknowledgmentMode = ackMode;
return(null);
}
// If a PUT is received, we immediately reject and tell the user to use PATCH instead
if (String.Equals(request.HttpMethod, HttpMethod.Put.Method, StringComparison.InvariantCultureIgnoreCase))
{
return(new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)
{
ReasonPhrase = "Use PATCH instead of PUT"
});
}
// If a PATCH is received, we internally change that to PUT
if (String.Equals(request.HttpMethod, "PATCH", StringComparison.InvariantCultureIgnoreCase))
{
request.HttpMethod = HttpMethod.Put.Method;
}
// Append something to the url
request.Url += (request.Url.Contains("?") ? "&" : "?") + "parameterAddedFromDemoInterceptor=valueAddedFromDemoInterceptor";
// Add an HTTP header
var headers = request.CloneHttpHeaders();
headers.Add("X-ThinkectureRelay-Example", $"Added by {nameof(DemoRequestInterceptor)}");
request.HttpHeaders = headers;
_logger?.Information("Demo interceptor modified request: {@Request}", request);
return(null);
}
/// <summary>
/// This method can modify the request and prevent further processing by returning an <see cref="HttpResponseMessage"/>.
/// </summary>
/// <param name="request">The request that can be modified.</param>
/// <returns>If the returned <see cref="HttpResponseMessage"/> is not null then it will immediately be send out to the client without any further processing.</returns>
public HttpResponseMessage OnRequestReceived(IInterceptedRequest request)
{
_logger?.Debug($"{nameof(DemoRequestInterceptor)}.{nameof(OnRequestReceived)} is called.");
if (_context.IsLocal)
{
_logger?.Debug("This request comes from localhost.");
}
// Example: Move query parameters into own JSON property
if (request.Url.Contains("?"))
{
var parts = request.Url.Split('?');
request.Url = parts[0];
request.Properties = new Dictionary <string, object>()
{
{ "Parameter", parts[1] }
};
}
// Example: Modify content
if (request.HttpHeaders.TryGetValue("Content-Type", out var contentType) && contentType == "application/json")
{
using (var reader = new StreamReader(request.Content))
{
// get original content
var content = reader.ReadToEnd();
_logger?.Information("Received content {Content}", content);
// modify content
content = $"{{ \"modified\": true, \"originalContent\": {content} }}";
request.Content = new MemoryStream(Encoding.UTF8.GetBytes(content));
}
}
// Example: Set Request expiration
if (request.HttpHeaders.TryGetValue("Request-Expiration", out var expirationValue) && TimeSpan.TryParse(expirationValue, out var expiration))
{
_logger?.Information("Interceptor is setting RabbitMQ TTL to {RequestExpiration} for Request {RequestId}", expiration, request.RequestId);
request.Expiration = expiration;
return(null);
}
// Example: Set AcknowledgmentMode
if (request.HttpHeaders.TryGetValue("Acknowledgment-Mode", out var ackModeValue) && Enum.TryParse(ackModeValue, out AcknowledgmentMode ackMode))
{
// This request will be auto-acknowledged when taken out of RabbitMQ.
// When there is a problem with SignalR or the OnPremiseConnector, this request may not reach the remote API.
request.AcknowledgmentMode = ackMode;
return(null);
}
// If a PUT is received, we immediately reject and tell the user to use PATCH instead
if (String.Equals(request.HttpMethod, HttpMethod.Put.Method, StringComparison.InvariantCultureIgnoreCase))
{
return(new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)
{
ReasonPhrase = "Use PATCH instead of PUT"
});
}
// If a PATCH is received, we internally change that to PUT
if (String.Equals(request.HttpMethod, "PATCH", StringComparison.InvariantCultureIgnoreCase))
{
request.HttpMethod = HttpMethod.Put.Method;
}
// Append something to the url
request.Url += (request.Url.Contains("?") ? "&" : "?") + "parameterAddedFromDemoInterceptor=valueAddedFromDemoInterceptor";
// Add an HTTP header
var headers = request.CloneHttpHeaders();
headers.Add("X-ThinkectureRelay-Example", $"Added by {nameof(DemoRequestInterceptor)}");
request.HttpHeaders = headers;
_logger?.Information("Demo interceptor modified request");
return(null);
}