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package com.juick.server;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.server.api.activity.model.Context;
import com.juick.server.api.activity.model.Person;
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.HttpClientErrorException;
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 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.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
@Component
public class SignatureManager {
private static final Logger logger = LoggerFactory.getLogger(ActivityPubManager.class);
@Inject
private KeystoreManager keystoreManager;
@Inject
private ObjectMapper jsonMapper;
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 = DateTimeFormatter.RFC_1123_DATE_TIME.withZone(ZoneId.of("UTC")).format(now);
Signature templateSignature = new Signature(from.getPublicKey().getId(), "rsa-sha256", null,
"(request-target)", "host", "date");
Signer signer = new Signer(keystoreManager.getPrivateKey(), templateSignature);
Map<String, String> headers = new HashMap<>();
headers.put("host", inbox.getHost());
headers.put("date", requestDate);
Signature signature = signer.sign("POST", inbox.getPath(), headers);
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Content-Type", Context.ACTIVITY_JSON_MEDIA_TYPE);
requestHeaders.add("Date", requestDate);
requestHeaders.add("Signature", signature.toString().substring(10));
HttpEntity<Context> request = new HttpEntity<>(Context.build(data), requestHeaders);
//boolean valid = verifySignature(Signature.fromString(requestHeaders.getFirst("Signature")),
// keystoreManager.getPublicKey(), "POST", inbox.getPath(), headers);
logger.info("Sending context: {}", jsonMapper.writeValueAsString(data));
ResponseEntity<Void> response = new RestTemplate().postForEntity(inbox, request, Void.class);
logger.info("accepted follower: {}", response.getStatusCodeValue());
}
public boolean verifySignature(String signatureString, URI actor, String method, String path, Map<String, String> headers) {
Optional<Context> context = getContext(actor);
if (context.isPresent() && context.get() instanceof Person) {
Person person = (Person) context.get();
Key key = KeystoreManager.publicKeyOf(person);
Verifier verifier = new Verifier(key, Signature.fromString(signatureString));
try {
boolean result = verifier.verify(method, path, headers);
logger.info("signature is valid: {}", result);
return result;
} catch (NoSuchAlgorithmException | SignatureException | IOException e) {
logger.info("signature exception", e);
return false;
}
}
logger.info("person not found");
return false;
}
public Optional<Context> getContext(URI contextUri) {
try {
return Optional.of(new RestTemplate().getForEntity(contextUri, Context.class).getBody());
} catch (HttpClientErrorException e) {
logger.warn("Cannot identify {}", contextUri);
}
return Optional.empty();
}
}
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