/
OAuthSessionFactory.java
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/
OAuthSessionFactory.java
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/*
* Copyright (C) 2016 Square, Inc.
*
* Licensed 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 okhttp3.slack;
import java.io.Closeable;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.LinkedHashMap;
import java.util.Map;
import okhttp3.HttpUrl;
import okhttp3.mockwebserver.Dispatcher;
import okhttp3.mockwebserver.MockResponse;
import okhttp3.mockwebserver.MockWebServer;
import okhttp3.mockwebserver.RecordedRequest;
import okio.ByteString;
/**
* Runs a MockWebServer on localhost and uses it as the backend to receive an OAuth session.
*
* <p>Clients should call {@link #start}, {@link #newAuthorizeUrl} and {@link #close} in that order.
* Clients may request multiple sessions.
*/
public final class OAuthSessionFactory extends Dispatcher implements Closeable {
private final SecureRandom secureRandom = new SecureRandom();
private final SlackApi slackApi;
private MockWebServer mockWebServer;
/** Guarded by this. */
private final Map<ByteString, Listener> listeners = new LinkedHashMap<>();
public OAuthSessionFactory(SlackApi slackApi) {
this.slackApi = slackApi;
}
public void start() throws Exception {
if (mockWebServer != null) throw new IllegalStateException();
mockWebServer = new MockWebServer();
mockWebServer.setDispatcher(this);
mockWebServer.start(slackApi.port);
}
public HttpUrl newAuthorizeUrl(String scopes, String team, Listener listener) {
if (mockWebServer == null) throw new IllegalStateException();
ByteString state = randomToken();
synchronized (this) {
listeners.put(state, listener);
}
return slackApi.authorizeUrl(scopes, redirectUrl(), state, team);
}
private ByteString randomToken() {
byte[] bytes = new byte[16];
secureRandom.nextBytes(bytes);
return ByteString.of(bytes);
}
private HttpUrl redirectUrl() {
return mockWebServer.url("/oauth/");
}
/** When the browser hits the redirect URL, use the provided code to ask Slack for a session. */
@Override public MockResponse dispatch(RecordedRequest request) {
HttpUrl requestUrl = mockWebServer.url(request.getPath());
String code = requestUrl.queryParameter("code");
String stateString = requestUrl.queryParameter("state");
ByteString state = stateString != null ? ByteString.decodeBase64(stateString) : null;
Listener listener;
synchronized (this) {
listener = listeners.get(state);
}
if (code == null || listener == null) {
return new MockResponse()
.setResponseCode(404)
.setBody("unexpected request");
}
try {
OAuthSession session = slackApi.exchangeCode(code, redirectUrl());
listener.sessionGranted(session);
} catch (IOException e) {
return new MockResponse()
.setResponseCode(400)
.setBody("code exchange failed: " + e.getMessage());
}
synchronized (this) {
listeners.remove(state);
}
// Success!
return new MockResponse()
.setResponseCode(302)
.addHeader("Location", "https://twitter.com/CuteEmergency/status/789457462864863232");
}
public interface Listener {
void sessionGranted(OAuthSession session);
}
@Override public void close() {
if (mockWebServer == null) throw new IllegalStateException();
try {
mockWebServer.close();
} catch (IOException ignored) {
}
}
}