public boolean save(Avatar avatar) {
File file;
if (isAvatarCached(avatar)) {
file = new File(getAvatarPath(avatar.getFilename()));
} else {
String filename = getAvatarPath(avatar.getFilename());
file = new File(filename + ".tmp");
file.getParentFile().mkdirs();
OutputStream os = null;
try {
file.createNewFile();
os = new FileOutputStream(file);
MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.reset();
DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
mDigestOutputStream.write(avatar.getImageAsBytes());
mDigestOutputStream.flush();
mDigestOutputStream.close();
String sha1sum = CryptoHelper.bytesToHex(digest.digest());
if (sha1sum.equals(avatar.sha1sum)) {
file.renameTo(new File(filename));
} else {
Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
file.delete();
return false;
}
} catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
return false;
} finally {
close(os);
}
}
avatar.size = file.length();
return true;
}
public boolean isAvatarCached(Avatar avatar) {
File file = new File(getAvatarPath(avatar.getFilename()));
return file.exists();
}