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// Copyright (C) 2012 The Android Open Source Project
//
// 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 com.google.gerrit.httpd;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.config.AuthConfig;
import com.google.gwtjsonrpc.server.SignedToken;
import com.google.gwtjsonrpc.server.ValidToken;
import com.google.gwtjsonrpc.server.XsrfException;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import org.eclipse.jgit.util.Base64;
import java.io.UnsupportedEncodingException;
/** Verifies the token sent by {@link RestApiServlet}. */
public class SignedTokenRestTokenVerifier implements RestTokenVerifier {
private final SignedToken restToken;
public static class Module extends AbstractModule {
@Override
protected void configure() {
bind(RestTokenVerifier.class).to(SignedTokenRestTokenVerifier.class);
}
}
@Inject
SignedTokenRestTokenVerifier(AuthConfig config) {
restToken = config.getRestToken();
}
@Override
public String sign(Account.Id user, String url) {
try {
String payload = String.format("%s:%s", user, url);
byte[] utf8 = payload.getBytes("UTF-8");
String base64 = Base64.encodeBytes(utf8);
return restToken.newToken(base64);
} catch (XsrfException e) {
throw new IllegalArgumentException(e);
} catch (UnsupportedEncodingException e) {
throw new IllegalArgumentException(e);
}
}
@Override
public void verify(Account.Id user, String url, String tokenString)
throws InvalidTokenException {
ValidToken token;
try {
token = restToken.checkToken(tokenString, null);
} catch (XsrfException err) {
throw new InvalidTokenException(err);
}
if (token == null || token.getData() == null || token.getData().isEmpty()) {
throw new InvalidTokenException();
}
String payload;
try {
payload = new String(Base64.decode(token.getData()), "UTF-8");
} catch (UnsupportedEncodingException err) {
throw new InvalidTokenException(err);
}
int colonPos = payload.indexOf(':');
if (colonPos == -1) {
throw new InvalidTokenException();
}
Account.Id tokenUser;
try {
tokenUser = Account.Id.parse(payload.substring(0, colonPos));
} catch (IllegalArgumentException err) {
throw new InvalidTokenException(err);
}
String tokenUrl = payload.substring(colonPos+1);
if (!tokenUser.equals(user) || !tokenUrl.equals(url)) {
throw new InvalidTokenException();
}
}
}
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