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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package org.openqa.selenium.remote.http;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;
import static java.net.HttpURLConnection.HTTP_NOT_FOUND;
import static org.openqa.selenium.remote.http.Contents.asJson;
import static org.openqa.selenium.remote.http.Contents.utf8String;
import static org.openqa.selenium.remote.http.HttpMethod.DELETE;
import static org.openqa.selenium.remote.http.HttpMethod.GET;
import static org.openqa.selenium.remote.http.HttpMethod.OPTIONS;
import static org.openqa.selenium.remote.http.HttpMethod.POST;
import static org.openqa.selenium.remote.http.UrlPath.ROUTE_PREFIX_KEY;
import com.google.common.collect.ImmutableMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.openqa.selenium.internal.Require;
public abstract class Route implements HttpHandler, Routable {
public HttpHandler fallbackTo(Supplier handler) {
Require.nonNull("Handler", handler);
return req -> {
if (matches(req)) {
return Route.this.execute(req);
}
return Require.state("Handler", handler.get()).nonNull().execute(req);
};
}
@Override
public final HttpResponse execute(HttpRequest req) {
if (!matches(req)) {
return new HttpResponse()
.setStatus(HTTP_NOT_FOUND)
.setContent(
asJson(
ImmutableMap.of(
"value",
ImmutableMap.of(
"error", "unknown command",
"message", "Unable to find handler for " + req,
"stacktrace", ""))));
}
HttpResponse res = handle(req);
if (res != null) {
return res;
}
return new HttpResponse()
.setStatus(HTTP_INTERNAL_ERROR)
.addHeader("WebDriver-Error", "unsupported operation")
.addHeader("Selenium-Route", "NULL_RES")
.setContent(
asJson(
ImmutableMap.of(
"value",
ImmutableMap.of(
"error", "unsupported operation",
"message",
String.format("Found handler for %s, but nothing was returned", req),
"stacktrace", ""))));
}
protected abstract HttpResponse handle(HttpRequest req);
public static PredicatedConfig matching(Predicate predicate) {
return new PredicatedConfig(Require.nonNull("Predicate", predicate));
}
public static TemplatizedRouteConfig delete(String template) {
UrlTemplate urlTemplate = new UrlTemplate(Require.nonNull("URL template", template));
return new TemplatizedRouteConfig(
new MatchesHttpMethod(DELETE).and(new MatchesTemplate(urlTemplate)), urlTemplate);
}
public static TemplatizedRouteConfig get(String template) {
UrlTemplate urlTemplate = new UrlTemplate(Require.nonNull("URL template", template));
return new TemplatizedRouteConfig(
new MatchesHttpMethod(GET).and(new MatchesTemplate(urlTemplate)), urlTemplate);
}
public static TemplatizedRouteConfig post(String template) {
UrlTemplate urlTemplate = new UrlTemplate(Require.nonNull("URL template", template));
return new TemplatizedRouteConfig(
new MatchesHttpMethod(POST).and(new MatchesTemplate(urlTemplate)), urlTemplate);
}
public static TemplatizedRouteConfig options(String template) {
UrlTemplate urlTemplate = new UrlTemplate(Require.nonNull("URL template", template));
return new TemplatizedRouteConfig(
new MatchesHttpMethod(OPTIONS).and(new MatchesTemplate(urlTemplate)), urlTemplate);
}
public static NestedRouteConfig prefix(String prefix) {
Require.nonNull("Prefix", prefix);
Require.stateCondition(!prefix.isEmpty(), "Prefix to use must not be of 0 length");
return new NestedRouteConfig(prefix);
}
public static Route combine(Routable first, Routable... others) {
Require.nonNull("At least one route", first);
return new CombinedRoute(Stream.concat(Stream.of(first), Stream.of(others)));
}
public static Route combine(Iterable routes) {
Require.nonNull("At least one route", routes);
return new CombinedRoute(StreamSupport.stream(routes.spliterator(), false));
}
public static class TemplatizedRouteConfig {
private final Predicate predicate;
private final UrlTemplate template;
private TemplatizedRouteConfig(Predicate predicate, UrlTemplate template) {
this.predicate = Require.nonNull("Predicate", predicate);
this.template = Require.nonNull("URL template", template);
}
public Route to(Supplier handler) {
Require.nonNull("Handler supplier", handler);
return to(params -> handler.get());
}
public Route to(Function, HttpHandler> handlerFunc) {
Require.nonNull("Handler creator", handlerFunc);
return new TemplatizedRoute(template, predicate, handlerFunc);
}
}
private static class TemplatizedRoute extends Route {
private final UrlTemplate template;
private final Predicate predicate;
private final Function, HttpHandler> handlerFunction;
private TemplatizedRoute(
UrlTemplate template,
Predicate predicate,
Function, HttpHandler> handlerFunction) {
this.template = Require.nonNull("URL template", template);
this.predicate = Require.nonNull("Predicate", predicate);
this.handlerFunction = Require.nonNull("Handler function", handlerFunction);
}
@Override
public boolean matches(HttpRequest request) {
return predicate.test(request);
}
@Override
protected HttpResponse handle(HttpRequest req) {
UrlTemplate.Match match = template.match(req.getUri());
HttpHandler handler =
handlerFunction.apply(match == null ? ImmutableMap.of() : match.getParameters());
if (handler == null) {
return new HttpResponse()
.setStatus(HTTP_INTERNAL_ERROR)
.setContent(utf8String("Unable to find handler for " + req));
}
return handler.execute(req);
}
}
private static class MatchesHttpMethod implements Predicate {
private final HttpMethod method;
private MatchesHttpMethod(HttpMethod method) {
this.method = Require.nonNull("HTTP method to test", method);
}
@Override
public boolean test(HttpRequest request) {
return method == request.getMethod();
}
}
private static class MatchesTemplate implements Predicate {
private final UrlTemplate template;
private MatchesTemplate(UrlTemplate template) {
this.template = Require.nonNull("URL template to test", template);
}
@Override
public boolean test(HttpRequest request) {
return template.match(request.getUri()) != null;
}
}
public static class NestedRouteConfig {
private final String prefix;
private NestedRouteConfig(String prefix) {
this.prefix = Require.nonNull("Prefix", prefix);
}
public Route to(Route route) {
Require.nonNull("Target for requests", route);
return new NestedRoute(prefix, route);
}
}
private static class NestedRoute extends Route {
private final String[] prefixPaths;
private final String prefix;
private final Route route;
private NestedRoute(String prefix, Route route) {
this.prefixPaths = Require.nonNull("Prefix", prefix).split("/");
this.prefix = prefix;
this.route = Require.nonNull("Target for requests", route);
}
@Override
public boolean matches(HttpRequest request) {
return hasPrefix(request) && route.matches(transform(request));
}
private boolean hasPrefix(HttpRequest request) {
String[] parts = request.getUri().split("/");
if (parts.length < prefixPaths.length) {
return false;
}
for (int i = 0; i < prefixPaths.length; i++) {
if (!prefixPaths[i].equals(parts[i])) {
return false;
}
}
return true;
}
@Override
protected HttpResponse handle(HttpRequest req) {
return route.execute(transform(req));
}
private HttpRequest transform(HttpRequest request) {
// Strip the prefix from the existing request and forward it.
String unprefixed =
hasPrefix(request) ? request.getUri().substring(prefix.length()) : request.getUri();
HttpRequest toForward = new HttpRequest(request.getMethod(), unprefixed);
request.forEachHeader(
(name, value) -> {
if (name == null) {
return;
}
toForward.addHeader(name, value);
});
request
.getAttributeNames()
.forEach(attr -> toForward.setAttribute(attr, request.getAttribute(attr)));
// Don't forget to register our prefix
Object rawPrefixes = request.getAttribute(ROUTE_PREFIX_KEY);
if (!(rawPrefixes instanceof List)) {
rawPrefixes = new LinkedList<>();
}
List prefixes =
Stream.concat(((List) rawPrefixes).stream(), Stream.of(prefix))
.map(String::valueOf)
.collect(toImmutableList());
toForward.setAttribute(ROUTE_PREFIX_KEY, prefixes);
request
.getQueryParameterNames()
.forEach(
name ->
request
.getQueryParameters(name)
.forEach(value -> toForward.addQueryParameter(name, value)));
toForward.setContent(request.getContent());
return toForward;
}
}
private static class CombinedRoute extends Route {
private final List allRoutes;
private CombinedRoute(Stream routes) {
// We want later routes to have a greater chance of being called so that we can override
// routes as necessary.
allRoutes = routes.collect(toImmutableList()).reverse();
Require.stateCondition(!allRoutes.isEmpty(), "At least one route must be specified.");
}
@Override
public boolean matches(HttpRequest request) {
return allRoutes.stream().anyMatch(route -> route.matches(request));
}
@Override
protected HttpResponse handle(HttpRequest req) {
return allRoutes.stream()
.filter(route -> route.matches(req))
.findFirst()
.map(route -> (HttpHandler) route)
.orElse(
request ->
new HttpResponse()
.setStatus(HTTP_NOT_FOUND)
.setContent(utf8String("No handler found for " + request)))
.execute(req);
}
}
public static class PredicatedConfig {
private final Predicate predicate;
private PredicatedConfig(Predicate predicate) {
this.predicate = Require.nonNull("Predicate", predicate);
}
public Route to(Supplier handler) {
return new PredicatedRoute(predicate, Require.nonNull("Handler supplier", handler));
}
}
private static class PredicatedRoute extends Route {
private final Predicate predicate;
private final Supplier supplier;
private PredicatedRoute(Predicate predicate, Supplier supplier) {
this.predicate = Require.nonNull("Predicate", predicate);
this.supplier = Require.nonNull("Supplier", supplier);
}
@Override
public boolean matches(HttpRequest httpRequest) {
return predicate.test(httpRequest);
}
@Override
protected HttpResponse handle(HttpRequest req) {
HttpHandler handler = supplier.get();
if (handler == null) {
throw new IllegalStateException("No handler available.");
}
return handler.execute(req);
}
}
}