Implement creating V2 Groups

[signal-cli] / src / main / java / org / asamk / signal / manager / helper / UnidentifiedAccessHelper.java

diff --git a/src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessHelper.java b/src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessHelper.java
new file mode 100644 (file)
index 0000000..d49c23c
--- /dev/null
+++ b/src/main/java/org/asamk/signal/manager/helper/UnidentifiedAccessHelper.java
@@ -0,0 +1,102 @@
+package org.asamk.signal.manager.helper;
+
+import org.asamk.signal.storage.profiles.SignalProfile;
+import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
+import org.signal.zkgroup.profiles.ProfileKey;
+import org.whispersystems.libsignal.util.guava.Optional;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccess;
+import org.whispersystems.signalservice.api.crypto.UnidentifiedAccessPair;
+import org.whispersystems.signalservice.api.push.SignalServiceAddress;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.whispersystems.signalservice.internal.util.Util.getSecretBytes;
+
+public class UnidentifiedAccessHelper {
+
+    private final SelfProfileKeyProvider selfProfileKeyProvider;
+
+    private final ProfileKeyProvider profileKeyProvider;
+
+    private final ProfileProvider profileProvider;
+
+    private final UnidentifiedAccessSenderCertificateProvider senderCertificateProvider;
+
+    public UnidentifiedAccessHelper(final SelfProfileKeyProvider selfProfileKeyProvider, final ProfileKeyProvider profileKeyProvider, final ProfileProvider profileProvider, final UnidentifiedAccessSenderCertificateProvider senderCertificateProvider) {
+        this.selfProfileKeyProvider = selfProfileKeyProvider;
+        this.profileKeyProvider = profileKeyProvider;
+        this.profileProvider = profileProvider;
+        this.senderCertificateProvider = senderCertificateProvider;
+    }
+
+    public byte[] getSelfUnidentifiedAccessKey() {
+        return UnidentifiedAccess.deriveAccessKeyFrom(selfProfileKeyProvider.getProfileKey());
+    }
+
+    public byte[] getTargetUnidentifiedAccessKey(SignalServiceAddress recipient) {
+        ProfileKey theirProfileKey = profileKeyProvider.getProfileKey(recipient);
+        if (theirProfileKey == null) {
+            return null;
+        }
+
+        SignalProfile targetProfile = profileProvider.getProfile(recipient);
+        if (targetProfile == null || targetProfile.getUnidentifiedAccess() == null) {
+            return null;
+        }
+
+        if (targetProfile.isUnrestrictedUnidentifiedAccess()) {
+            return createUnrestrictedUnidentifiedAccess();
+        }
+
+        return UnidentifiedAccess.deriveAccessKeyFrom(theirProfileKey);
+    }
+
+    public Optional<UnidentifiedAccessPair> getAccessForSync() {
+        byte[] selfUnidentifiedAccessKey = getSelfUnidentifiedAccessKey();
+        byte[] selfUnidentifiedAccessCertificate = senderCertificateProvider.getSenderCertificate();
+
+        if (selfUnidentifiedAccessKey == null || selfUnidentifiedAccessCertificate == null) {
+            return Optional.absent();
+        }
+
+        try {
+            return Optional.of(new UnidentifiedAccessPair(
+                    new UnidentifiedAccess(selfUnidentifiedAccessKey, selfUnidentifiedAccessCertificate),
+                    new UnidentifiedAccess(selfUnidentifiedAccessKey, selfUnidentifiedAccessCertificate)
+            ));
+        } catch (InvalidCertificateException e) {
+            return Optional.absent();
+        }
+    }
+
+    public List<Optional<UnidentifiedAccessPair>> getAccessFor(Collection<SignalServiceAddress> recipients) {
+        return recipients.stream()
+                .map(this::getAccessFor)
+                .collect(Collectors.toList());
+    }
+
+    public Optional<UnidentifiedAccessPair> getAccessFor(SignalServiceAddress recipient) {
+        byte[] recipientUnidentifiedAccessKey = getTargetUnidentifiedAccessKey(recipient);
+        byte[] selfUnidentifiedAccessKey = getSelfUnidentifiedAccessKey();
+        byte[] selfUnidentifiedAccessCertificate = senderCertificateProvider.getSenderCertificate();
+
+        if (recipientUnidentifiedAccessKey == null || selfUnidentifiedAccessKey == null || selfUnidentifiedAccessCertificate == null) {
+            return Optional.absent();
+        }
+
+        try {
+            return Optional.of(new UnidentifiedAccessPair(
+                    new UnidentifiedAccess(recipientUnidentifiedAccessKey, selfUnidentifiedAccessCertificate),
+                    new UnidentifiedAccess(selfUnidentifiedAccessKey, selfUnidentifiedAccessCertificate)
+            ));
+        } catch (InvalidCertificateException e) {
+            return Optional.absent();
+        }
+    }
+
+    private static byte[] createUnrestrictedUnidentifiedAccess() {
+        return getSecretBytes(16);
+    }
+}