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package com.juick.server;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.User;
import com.juick.model.AnonymousUser;
import com.juick.server.api.activity.model.Context;
import com.juick.server.api.activity.model.objects.Person;
import com.juick.server.api.webfinger.model.Account;
import com.juick.server.api.webfinger.model.Link;
import com.juick.service.UserService;
import com.juick.util.DateFormattersHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;
import org.tomitribe.auth.signatures.Signature;
import org.tomitribe.auth.signatures.Signer;
import org.tomitribe.auth.signatures.Verifier;
import rocks.xmpp.addr.Jid;
import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.time.Instant;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import static com.juick.server.api.activity.model.Context.ACTIVITY_MEDIA_TYPE;
@Component
public class SignatureManager {
private static final Logger logger = LoggerFactory.getLogger(ActivityPubManager.class);
@Inject
private KeystoreManager keystoreManager;
@Inject
private ObjectMapper jsonMapper;
@Inject
private UserService userService;
@Inject
private RestTemplate apClient;
public void post(Person from, Person to, Context data) throws IOException {
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();
String signatureString = addSignature(from, host, "POST", inbox.getPath(), requestDate);
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Content-Type", Context.ACTIVITYSTREAMS_PROFILE_MEDIA_TYPE);
requestHeaders.add("Date", requestDate);
requestHeaders.add("Host", host);
requestHeaders.add("Signature", signatureString);
HttpEntity<Context> request = new HttpEntity<>(Context.build(data), requestHeaders);
logger.info("Sending context: {}", jsonMapper.writeValueAsString(data));
logger.info("Request date: {}", requestDate);
ResponseEntity<Void> response = apClient.postForEntity(inbox, request, Void.class);
logger.info("accepted follower: {}", response.getStatusCodeValue());
}
public String addSignature(Person from, String host, String method, String path, String dateString) throws IOException {
return addSignature(from, host, method, path, dateString, keystoreManager);
}
public String addSignature(Person from, String host, String method, String path, String dateString, KeystoreManager keystoreManager) throws IOException {
Signature templateSignature = new Signature(from.getPublicKey().getId(), "rsa-sha256", null,
"(request-target)", "host", "date");
Map<String, String> headers = new HashMap<>();
headers.put("host", host);
headers.put("date", dateString);
Signer signer = new Signer(keystoreManager.getPrivateKey(), templateSignature);
Signature signature = signer.sign(method, path, headers);
// remove "Signature: " from result
return signature.toString().substring(10);
}
public User verifySignature(String method, String path, Map<String, String> headers) throws IOException {
String signatureString = headers.get("signature");
if (StringUtils.isEmpty(signatureString)) {
return AnonymousUser.INSTANCE;
}
Signature signature = Signature.fromString(signatureString);
Optional<Context> context = getContext(URI.create(signature.getKeyId()));
if (context.isPresent() && context.get() instanceof Person) {
Person person = (Person) context.get();
Key key = KeystoreManager.publicKeyOf(person);
Verifier verifier = new Verifier(key, signature);
try {
boolean result = verifier.verify(method, path, headers);
logger.info("signature of {} is valid: {}", signature.getKeyId(), result);
if (result) {
User user = new User();
user.setUri(URI.create(person.getId()));
if (key.equals(keystoreManager.getPublicKey())) {
return userService.getUserByName(person.getName());
}
return user;
} else {
return AnonymousUser.INSTANCE;
}
} catch (NoSuchAlgorithmException | SignatureException | IOException e) {
throw new IOException("Invalid signature");
}
}
throw new IOException("Person not found");
}
public Optional<Context> getContext(URI contextUri) {
try {
Context context = apClient.getForEntity(contextUri, Context.class).getBody();
if (context == null) {
logger.warn("Cannot identify {}", contextUri);
return Optional.empty();
}
return Optional.of(context);
} catch (Exception e) {
logger.warn("REST Exception processing {}", contextUri, e);
}
return Optional.empty();
}
public Optional<Context> discoverPerson(String acct) {
String[] accountParts = acct.split(":", 2);
String account = accountParts[0];
int port = accountParts.length > 1 ? Integer.valueOf(accountParts[1]) : 80;
Jid acctId = Jid.of(account);
URI resourceUri = UriComponentsBuilder.fromUriString(
String.format("http://%s:%d/.well-known/webfinger?resource=acct:%s", acctId.getDomain(), port, account)).build().toUri();
Account acctData = apClient.getForEntity(resourceUri, Account.class).getBody();
if (acctData != null) {
for (Link l : acctData.getLinks()) {
if (l.getRel().equals("self") && l.getType().equals(ACTIVITY_MEDIA_TYPE)) {
return getContext(URI.create(l.getHref()));
}
}
}
return Optional.empty();
}
}
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