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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.server.mail;
import static com.google.common.base.Preconditions.checkState;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.io.BaseEncoding;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.config.AuthConfig;
import com.google.gerrit.server.mail.send.RegisterNewEmailSender;
import com.google.gwtjsonrpc.common.CheckTokenException;
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 com.google.inject.Singleton;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/** Verifies the token sent by {@link RegisterNewEmailSender}. */
@Singleton
public class SignedTokenEmailTokenVerifier implements EmailTokenVerifier {
private final SignedToken emailRegistrationToken;
public static class Module extends AbstractModule {
@Override
protected void configure() {
bind(EmailTokenVerifier.class).to(SignedTokenEmailTokenVerifier.class);
}
}
@Inject
SignedTokenEmailTokenVerifier(AuthConfig config) {
emailRegistrationToken = config.getEmailRegistrationToken();
}
@Override
public String encode(Account.Id accountId, String emailAddress) {
checkEmailRegistrationToken();
try {
String payload = String.format("%s:%s", accountId, emailAddress);
byte[] utf8 = payload.getBytes(UTF_8);
String base64 = BaseEncoding.base64Url().encode(utf8);
return emailRegistrationToken.newToken(base64);
} catch (XsrfException e) {
throw new IllegalArgumentException(e);
}
}
@Override
public ParsedToken decode(String tokenString) throws InvalidTokenException {
checkEmailRegistrationToken();
ValidToken token;
try {
token = emailRegistrationToken.checkToken(tokenString, null);
} catch (XsrfException | CheckTokenException err) {
throw new InvalidTokenException(err);
}
if (token == null || token.getData() == null || token.getData().isEmpty()) {
throw new InvalidTokenException();
}
String payload = new String(BaseEncoding.base64Url().decode(token.getData()), UTF_8);
Matcher matcher = Pattern.compile("^([0-9]+):(.+@.+)$").matcher(payload);
if (!matcher.matches()) {
throw new InvalidTokenException();
}
Account.Id id = Account.Id.tryParse(matcher.group(1)).orElseThrow(InvalidTokenException::new);
String newEmail = matcher.group(2);
return new ParsedToken(id, newEmail);
}
private void checkEmailRegistrationToken() {
checkState(
emailRegistrationToken != null, "'auth.registerEmailPrivateKey' not set in gerrit.config");
}
}
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