@Override
public synchronized void addIdentifier(String key, UUID value) throws InputOutputException {
SecuredDhtPathElement keyDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + key),
this.domainKey);
SecuredDhtPathElement valueDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + value),
this.domainKey);
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
byte[] valueBytes = value.toString().getBytes(StandardCharsets.UTF_8);
// store key and value
this.storageAdapter.persist(StorageType.FILE, keyDhtPathElement, valueBytes);
this.storageAdapter.persist(StorageType.FILE, valueDhtPathElement, keyBytes);
}
@Override
public synchronized void removeIdentifier(String key) throws InputOutputException {
SecuredDhtPathElement keyDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + key),
this.domainKey);
// try to get associated value
UUID value = this.getValue(key);
if (null != value) {
// there is a value associated -> remove it too
SecuredDhtPathElement valueDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + value),
this.domainKey);
this.storageAdapter.delete(valueDhtPathElement);
}
this.storageAdapter.delete(keyDhtPathElement);
}
@Override
public synchronized UUID getValue(String key) throws InputOutputException {
SecuredDhtPathElement keyDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + key),
this.domainKey);
byte[] uuidStringBytes = this.storageAdapter.read(keyDhtPathElement);
if (0 == uuidStringBytes.length) {
return null;
}
return UUID.fromString(new String(uuidStringBytes, StandardCharsets.UTF_8));
}
@Override
public synchronized String getKey(UUID value) throws InputOutputException {
SecuredDhtPathElement valueDhtPathElement =
new SecuredDhtPathElement(
this.username,
Hash.hash(HashingAlgorithm.SHA_256, this.identifierContentKey + value),
this.domainKey);
byte[] keyStringBytes = this.storageAdapter.read(valueDhtPathElement);
if (0 == keyStringBytes.length) {
// value not found
return null;
}
return new String(keyStringBytes, StandardCharsets.UTF_8);
}