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/*
* Copyright (C) 2008-2020, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.juick.service;
import com.juick.model.User;
import com.juick.service.activities.DeleteUserEvent;
import com.juick.util.DateFormattersHolder;
import com.juick.www.api.activity.model.Context;
import com.juick.www.api.activity.model.objects.Actor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.KeystoreManager;
import com.juick.model.AnonymousUser;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.core.convert.ConversionService;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.http.*;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;
import org.tomitribe.auth.signatures.MissingRequiredHeaderException;
import org.tomitribe.auth.signatures.Signature;
import org.tomitribe.auth.signatures.Verifier;
import javax.annotation.Nonnull;
import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.time.Instant;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
@Repository
public class ActivityPubService extends BaseJdbcService implements SocialService {
private static final Logger logger = LoggerFactory.getLogger("ActivityPub");
@Value("${ap_base_uri:http://localhost:8080/}")
private String baseUri;
@Inject
private UserService userService;
@Inject
private RestTemplate restClient;
@Inject
private ObjectMapper jsonMapper;
@Inject
private SignatureService signatureService;
@Inject
private ApplicationEventPublisher applicationEventPublisher;
@Inject
private KeystoreManager keystoreManager;
@Inject
private User serviceUser;
@Inject
private ConversionService conversionService;
@Transactional(readOnly = true)
@Override
public @Nonnull User getUserByAccountUri(String acct) {
UriComponents baseUriComponents = UriComponentsBuilder.fromUriString(baseUri).build();
UriComponents acctComponents = UriComponentsBuilder.fromUriString(acct).build();
if (acctComponents.getHost().equals(baseUriComponents.getHost())) {
// /u/ugnich -> ugnich
String userName = acctComponents.getPath().substring(3);
return userService.getUserByName(userName);
}
return AnonymousUser.INSTANCE;
}
@Transactional(readOnly = true)
@Override
public @Nonnull List<String> getFollowers(User user) {
return getJdbcTemplate().queryForList("SELECT acct FROM followers WHERE user_id=?", String.class,
user.getUid());
}
@Transactional
@Override
public void addFollower(User user, String acct) {
try {
getJdbcTemplate().update("INSERT INTO followers(user_id, acct) " +
"VALUES(?, ?)", user.getUid(), acct);
} catch (DuplicateKeyException e) {
// ignore
}
}
@Transactional
@Override
public void removeFollower(User user, String acct) {
getJdbcTemplate().update("DELETE FROM followers WHERE user_id=? AND acct=?", user.getUid(), acct);
}
@Transactional
@Override
public void removeAccount(String acct) {
getJdbcTemplate().update("DELETE FROM followers WHERE acct=?", acct);
}
@Cacheable("profiles")
public Optional<Context> get(URI contextUri) {
Instant now = Instant.now();
String requestDate = DateFormattersHolder.getHttpDateFormatter().format(now);
String host = contextUri.getPort() > 0 ? String.format("%s:%d", contextUri.getHost(), contextUri.getPort())
: contextUri.getHost();
var from = conversionService.convert(serviceUser, Actor.class);
try {
String signatureString = signatureService.addSignature(from, host, "get", contextUri.getPath(), requestDate,
"");
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Date", requestDate);
requestHeaders.add("Host", host);
requestHeaders.add("Signature", signatureString);
requestHeaders.setAccept(Collections.singletonList(MediaType.valueOf(Context.ACTIVITY_MEDIA_TYPE)));
HttpEntity<Void> activityRequest = new HttpEntity<>(requestHeaders);
var response = restClient.exchange(contextUri, HttpMethod.GET, activityRequest, Context.class);
if (response.getStatusCode().is2xxSuccessful()) {
var context = response.getBody();
if (context == null) {
logger.warn("Cannot identify {}", contextUri);
return Optional.empty();
}
return Optional.of(context);
}
} catch (IOException e) {
logger.warn("HTTP Signature exception: {}", e.getMessage());
}
return Optional.empty();
}
public HttpStatusCode post(Actor from, Actor to, Context data) throws IOException, NoSuchAlgorithmException {
UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(to.getInbox());
URI inbox = uriComponentsBuilder.build().toUri();
Instant now = Instant.now();
String requestDate = DateFormattersHolder.getHttpDateFormatter().format(now);
String host = inbox.getPort() > 0 ? String.format("%s:%d", inbox.getHost(), inbox.getPort()) : inbox.getHost();
var finalContext = Context.build(data);
var payload = jsonMapper.writeValueAsString(finalContext);
final byte[] digest = MessageDigest.getInstance("SHA-256").digest(payload.getBytes()); // (1)
final String digestHeader = "SHA-256=" + new String(Base64.encodeBase64(digest));
String signatureString = signatureService.addSignature(from, host, "post", inbox.getPath(), requestDate,
digestHeader);
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Content-Type", Context.ACTIVITYSTREAMS_PROFILE_MEDIA_TYPE);
requestHeaders.add("Date", requestDate);
requestHeaders.add("Host", host);
requestHeaders.add("Digest", digestHeader);
requestHeaders.add("Signature", signatureString);
HttpEntity<String> request = new HttpEntity<>(payload, requestHeaders);
logger.debug("Sending context to {}: {}", to.getId(), payload);
ResponseEntity<String> response = restClient.postForEntity(inbox, request, String.class);
logger.debug("Remote response: {} {}", response.getStatusCode(), response.getBody());
return response.getStatusCode();
}
public User verifyActor(String method, String path, Map<String, String> headers) {
String signatureString = headers.get("signature");
if (StringUtils.isNotEmpty(signatureString)) {
try {
Signature signature = Signature.fromString(signatureString);
var keyId = UriComponentsBuilder.fromUriString(signature.getKeyId()).fragment(null).build().toUri();
var user = getUserByAccountUri(keyId.toASCIIString());
Key key = null;
Actor actor = null;
if (!user.isAnonymous()) {
// local user
key = keystoreManager.getPublicKey();
} else {
var context = get(keyId);
if (context.isPresent()) {
actor = (Actor) context.get();
key = KeystoreManager.publicKeyOf(actor);
}
}
if (key != null) {
Verifier verifier = new Verifier(key, signature);
try {
boolean result = verifier.verify(method.toLowerCase(), path, headers);
if (result) {
if (!user.isAnonymous()) {
return user;
} else {
if (actor != null) {
User person = new User();
person.setUri(URI.create(actor.getId()));
if (actor.isSuspended()) {
logger.info("{} is suspended, deleting", actor.getId());
applicationEventPublisher
.publishEvent(new DeleteUserEvent(this, actor.getId()));
}
return person;
}
}
}
} catch (NoSuchAlgorithmException | SignatureException | MissingRequiredHeaderException
| IOException e) {
logger.warn("Verification error for {}: {}", signature.getKeyId(), e.getMessage());
}
}
} catch (Exception ex) {
}
}
return AnonymousUser.INSTANCE;
}
}
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