@Override
public boolean removeMetadataBlob(
UserPublicKey owner, byte[] encodedWritingPublicKey, byte[] writingKeySignedMapKeyPlusBlob) {
UserPublicKey writingKey = new UserPublicKey(encodedWritingPublicKey);
try {
byte[] payload = writingKey.unsignMessage(writingKeySignedMapKeyPlusBlob);
byte[] mapKey = Arrays.copyOfRange(payload, 0, 32);
byte[] metadataBlob =
Arrays.copyOfRange(
payload,
32,
payload
.length); // will be zero length for now // TODO change to the current blob hash
MetadataBlob blob = new MetadataBlob(writingKey.getPublicKeys(), mapKey, metadataBlob);
return blob.delete();
} catch (TweetNaCl.InvalidSignatureException e) {
System.err.println(
"Invalid signature during removeMetadataBlob for owner: "
+ owner
+ " and sharer: "
+ writingKey);
return false;
}
}
@Override
public boolean setMetadataBlob(
UserPublicKey owner, byte[] encodedWritingPublicKey, byte[] writingKeySignedMapKey) {
UserPublicKey writingKey = new UserPublicKey(encodedWritingPublicKey);
try {
byte[] payload = writingKey.unsignMessage(writingKeySignedMapKey);
byte[] mapKey = Arrays.copyOfRange(payload, 0, 32);
byte[] metadataBlob = Arrays.copyOfRange(payload, 32, payload.length);
MetadataBlob blob = new MetadataBlob(writingKey.getPublicKeys(), mapKey, metadataBlob);
return blob.insert();
} catch (TweetNaCl.InvalidSignatureException e) {
System.err.println(
"Invalid signature during setMetadataBlob for owner: "
+ owner
+ " and sharer: "
+ writingKey);
return false;
}
}
public static <T> T[] subarray(T[] a, int off, int len) {
return Arrays.copyOfRange(a,off,off+len);
}