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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.server.jetty;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.NoopSharedResource;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.handler.FastContentWriter;
import com.yahoo.jdisc.handler.ResponseDispatch;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.jdisc.http.HttpRequest;
import com.yahoo.jdisc.http.filter.RequestFilter;
import com.yahoo.jdisc.http.filter.ResponseFilter;
import org.eclipse.jetty.server.Request;
import java.net.URI;
import java.util.Map;
import java.util.Optional;
import static com.yahoo.jdisc.http.server.jetty.RequestUtils.getConnector;
/**
* Resolve request/response filter (chain) based on {@link FilterBindings}.
*
* @author bjorncs
*/
class FilterResolver {
private final FilterBindings bindings;
private final Metric metric;
private final boolean strictFiltering;
FilterResolver(FilterBindings bindings, Metric metric, boolean strictFiltering) {
this.bindings = bindings;
this.metric = metric;
this.strictFiltering = strictFiltering;
}
Optional<RequestFilter> resolveRequestFilter(Request request, URI jdiscUri) {
Optional<String> maybeFilterId = bindings.resolveRequestFilter(jdiscUri, getConnector(request).listenPort());
if (maybeFilterId.isPresent()) {
metric.add(MetricDefinitions.FILTERING_REQUEST_HANDLED, 1L, createMetricContext(request, maybeFilterId.get()));
request.setAttribute(RequestUtils.JDISC_REQUEST_CHAIN, maybeFilterId.get());
} else if (!strictFiltering) {
metric.add(MetricDefinitions.FILTERING_REQUEST_UNHANDLED, 1L, createMetricContext(request, null));
} else {
String syntheticFilterId = RejectingRequestFilter.SYNTHETIC_FILTER_CHAIN_ID;
metric.add(MetricDefinitions.FILTERING_REQUEST_HANDLED, 1L, createMetricContext(request, syntheticFilterId));
request.setAttribute(RequestUtils.JDISC_REQUEST_CHAIN, syntheticFilterId);
return Optional.of(RejectingRequestFilter.INSTANCE);
}
return maybeFilterId.map(bindings::getRequestFilter);
}
Optional<ResponseFilter> resolveResponseFilter(Request request, URI jdiscUri) {
Optional<String> maybeFilterId = bindings.resolveResponseFilter(jdiscUri, getConnector(request).listenPort());
if (maybeFilterId.isPresent()) {
metric.add(MetricDefinitions.FILTERING_RESPONSE_HANDLED, 1L, createMetricContext(request, maybeFilterId.get()));
request.setAttribute(RequestUtils.JDISC_RESPONSE_CHAIN, maybeFilterId.get());
} else {
metric.add(MetricDefinitions.FILTERING_RESPONSE_UNHANDLED, 1L, createMetricContext(request, null));
}
return maybeFilterId.map(bindings::getResponseFilter);
}
private Metric.Context createMetricContext(Request request, String filterId) {
Map<String, String> extraDimensions = filterId != null
? Map.of(MetricDefinitions.FILTER_CHAIN_ID_DIMENSION, filterId)
: Map.of();
return getConnector(request).createRequestMetricContext(request, extraDimensions);
}
private static class RejectingRequestFilter extends NoopSharedResource implements RequestFilter {
private static final RejectingRequestFilter INSTANCE = new RejectingRequestFilter();
private static final String SYNTHETIC_FILTER_CHAIN_ID = "strict-reject";
@Override
public void filter(HttpRequest request, ResponseHandler handler) {
Response response = new Response(Response.Status.FORBIDDEN);
response.headers().add("Content-Type", "text/plain");
try (FastContentWriter writer = ResponseDispatch.newInstance(response).connectFastWriter(handler)) {
writer.write("Request did not match any request filter chain");
}
}
}
}
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