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package ai.vespa.hosted.api;
import java.net.URI;
import java.security.Key;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.Arrays;
import java.util.Base64;
/**
* Verifies that signed HTTP requests match the indicated public key.
*
* @author jonmv
*/
public class RequestVerifier {
private final Key publicKey;
private final Clock clock;
public RequestVerifier(String pemPublicKey) {
this(pemPublicKey, Clock.systemUTC());
}
RequestVerifier(String pemPublicKey, Clock clock) {
this.publicKey = Signatures.parsePublicPemX509RsaKey(pemPublicKey);
this.clock = clock;
}
/** Returns whether the given data is a valid request now, as dictated by timestamp and the decryption key of this. */
public boolean verify(Method method, URI requestUri, String timestamp, String contentHash, String signature) {
try {
Instant now = clock.instant(), then = Instant.parse(timestamp);
if (Duration.between(now, then).abs().compareTo(Duration.ofMinutes(5)) > 0)
return false; // Timestamp mismatch between sender and receiver of more than 5 minutes is not acceptable.
byte[] canonicalMessage = Signatures.canonicalMessageOf(method.name(), requestUri, timestamp, contentHash);
byte[] decrypted = Signatures.decrypted(Base64.getDecoder().decode(signature), publicKey);
return Arrays.equals(canonicalMessage, decrypted);
}
catch (RuntimeException e) {
return false;
}
}
}
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