/**
* This method tries to guess the best update source for a given app based on its signature.
*
* @param pi The PackageInfo object returned by the PackageManager
* @return An adequate update source for the app, or null if auto-disvocery must take place.
*/
public static UpdateSource guess_update_source(PackageInfo pi) {
android.content.pm.Signature[] signs = pi.signatures;
for (Signature sign : signs) {
X509Certificate cert;
try {
cert =
(X509Certificate)
CertificateFactory.getInstance("X509")
.generateCertificate(new ByteArrayInputStream(sign.toByteArray()));
} catch (CertificateException e) {
Log.v(MainActivity.TAG, "Error while reading " + pi.packageName + "'s certificate.");
return null;
}
String[] details = cert.getSubjectDN().getName().split(",");
for (UpdateSource us : get_update_sources()) {
if (us.test_autoselection(pi.packageName, Arrays.asList(details))) {
return us;
}
}
}
return null;
}
