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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) [2019-2021] Payara Foundation and/or its affiliates. All rights reserved.
*
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* and Distribution License("CDDL") (collectively, the "License"). You
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*
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* file and include the License file at glassfish/legal/LICENSE.txt.
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* GPL Classpath Exception:
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package fish.payara.ejb.http.client;
import javax.naming.NamingException;
import jakarta.ws.rs.client.Client;
import jakarta.ws.rs.client.WebTarget;
import jakarta.ws.rs.core.Link;
import jakarta.ws.rs.core.Response;
import java.net.URI;
import static jakarta.ws.rs.core.Response.Status.Family.CLIENT_ERROR;
import static jakarta.ws.rs.core.Response.Status.Family.REDIRECTION;
import static jakarta.ws.rs.core.Response.Status.Family.SERVER_ERROR;
import static jakarta.ws.rs.core.Response.Status.Family.SUCCESSFUL;
import static jakarta.ws.rs.core.Response.Status.NOT_FOUND;
import static jakarta.ws.rs.core.Response.Status.OK;
/**
* Default implementation for the {@link LookupDiscoveryService} that uses HEAD request at the root {@link URI} to
* discover options and falls back to v0 at {@code /ejb} in case no options found.
*
* @author Patrik Duditš
* @author Jan Bernitt
*/
class LookupDiscoveryServiceImpl implements LookupDiscoveryService {
static final String INVOKER_V1_REL = "https://payara.fish/ejb-http-invoker/v1";
static final String INVOKER_V0_REL = "https://payara.fish/ejb-http-invoker/v0";
@Override
public LookupDiscoveryResponse discover(Client client, URI root) throws NamingException {
try (Response optionResponse = client.target(root).request().head()) {
Response.Status.Family responseFamily = optionResponse.getStatusInfo().getFamily();
if (responseFamily == REDIRECTION) {
URI resolvedRoot = root.resolve(optionResponse.getLocation());
try (Response redirctedOptionResponse = followRedirect(client, resolvedRoot)) {
return createDiscovery(client, resolvedRoot, redirctedOptionResponse);
}
}
return createDiscovery(client, root, optionResponse);
}
}
private static LookupDiscoveryResponse createDiscovery(Client client, URI root, Response optionResponse)
throws NamingException {
Response.Status.Family responseFamily = optionResponse.getStatusInfo().getFamily();
if (responseFamily == SUCCESSFUL) {
return discoverLinks(client, root, optionResponse);
}
String reasonPhrase = optionResponse.getStatusInfo().getReasonPhrase();
if (responseFamily == CLIENT_ERROR) {
if (optionResponse.getStatusInfo().toEnum() == NOT_FOUND) {
// 5.192 does not handle /, we may try the ejb endpoint
return discoverV0(client, root);
}
throw new NamingException("Invoker is not available at <" + root + ">: " + reasonPhrase);
}
if (responseFamily == SERVER_ERROR) {
throw new NamingException("Server is not available at <" + root + ">: " + reasonPhrase);
}
throw new NamingException("Unexpected status of invoker root resource <" + root + ">: " + reasonPhrase);
}
private static LookupDiscoveryResponse discoverV0(Client client, URI resolvedRoot) throws NamingException {
WebTarget invokerServletTarget = client.target(resolvedRoot).path("ejb/");
try (Response v0response = invokerServletTarget.request().head()) {
if (v0response.getStatusInfo().toEnum() == OK) {
return new LookupDiscoveryResponse(resolvedRoot, invokerServletTarget.path("lookup"));
}
throw new NamingException("Invoker V0 not found at <" + invokerServletTarget.getUri() + ">: "
+ v0response.getStatusInfo().getReasonPhrase());
}
}
private static Response followRedirect(Client client, URI root) throws NamingException {
Response redirectedResponse = client.target(root).request().head();
if (redirectedResponse.getStatusInfo().getFamily() == REDIRECTION) {
throw new NamingException("Multiple redirects when finding root resource: <" + root + "> -> <" +
root + "> -> (not followed) <" + redirectedResponse.getLocation() + ">");
}
return redirectedResponse;
}
private static LookupDiscoveryResponse discoverLinks(Client client, URI resolvedRoot, Response optionResponse) throws NamingException {
Link v0Link = optionResponse.getLink(INVOKER_V0_REL);
Link v1Link = optionResponse.getLink(INVOKER_V1_REL);
if (v0Link == null && v1Link == null) {
return discoverV0(client, resolvedRoot);
}
return new LookupDiscoveryResponse(resolvedRoot,
v0Link == null ? null : client.target(resolvedRoot.resolve(v0Link.getUri())),
v1Link == null ? null : client.target(resolvedRoot.resolve(v1Link.getUri())));
}
}