private static int getNextSignedPreKeyId(Context context) {
try {
File nextFile = new File(getSignedPreKeysDirectory(context), SignedPreKeyIndex.FILE_NAME);
if (!nextFile.exists()) {
return Util.getSecureRandom().nextInt(Medium.MAX_VALUE);
} else {
InputStreamReader reader = new InputStreamReader(new FileInputStream(nextFile));
SignedPreKeyIndex index = JsonUtils.fromJson(reader, SignedPreKeyIndex.class);
reader.close();
return index.nextSignedPreKeyId;
}
} catch (IOException e) {
Log.w("PreKeyUtil", e);
return Util.getSecureRandom().nextInt(Medium.MAX_VALUE);
}
}
private Set<String> getE164Numbers(Set<Recipient> recipients) throws InvalidNumberException {
Set<String> results = new HashSet<String>();
for (Recipient recipient : recipients) {
results.add(Util.canonicalizeNumber(this, recipient.getNumber()));
}
return results;
}
private TextSecureAttachmentPointer createAttachmentPointer(
MasterSecret masterSecret, PduPart part) throws InvalidPartException {
try {
MasterCipher masterCipher = new MasterCipher(masterSecret);
long id = Long.parseLong(Util.toIsoString(part.getContentLocation()));
byte[] key =
masterCipher.decryptBytes(Base64.decode(Util.toIsoString(part.getContentDisposition())));
String relay = null;
if (part.getName() != null) {
relay = Util.toIsoString(part.getName());
}
return new TextSecureAttachmentPointer(id, null, key, relay);
} catch (InvalidMessageException | IOException e) {
Log.w(TAG, e);
throw new InvalidPartException(e);
}
}
private static boolean isActiveInDirectory(Context context, Recipient recipient) {
try {
if (!TextSecureDirectory.getInstance(context)
.isActiveNumber(Util.canonicalizeNumber(context, recipient.getNumber()))) {
return false;
}
} catch (NotInDirectoryException e) {
return false;
} catch (InvalidNumberException e) {
return false;
}
return true;
}
