package eu.siacs.conversations.generator; import android.util.Base64; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.Locale; import java.util.TimeZone; import eu.siacs.conversations.services.XmppConnectionService; public abstract class AbstractGenerator { private final String[] FEATURES = { "urn:xmpp:jingle:1", "urn:xmpp:jingle:apps:file-transfer:3", "urn:xmpp:jingle:transports:s5b:1", "urn:xmpp:jingle:transports:ibb:1", "http://jabber.org/protocol/muc", "jabber:x:conference", "http://jabber.org/protocol/caps", "http://jabber.org/protocol/disco#info", "urn:xmpp:avatar:metadata+notify", "urn:xmpp:ping"}; private final String[] MESSAGE_CONFIRMATION_FEATURES = { "urn:xmpp:chat-markers:0", "urn:xmpp:receipts" }; public final String IDENTITY_NAME = "Conversations 1.0"; public final String IDENTITY_TYPE = "phone"; private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US); protected XmppConnectionService mXmppConnectionService; protected AbstractGenerator(XmppConnectionService service) { this.mXmppConnectionService = service; } public String getCapHash() { StringBuilder s = new StringBuilder(); s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<"); MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-1"); } catch (NoSuchAlgorithmException e) { return null; } for (String feature : getFeatures()) { s.append(feature + "<"); } byte[] sha1 = md.digest(s.toString().getBytes()); return new String(Base64.encode(sha1, Base64.DEFAULT)).trim(); } public static String getTimestamp(long time) { DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC")); return DATE_FORMAT.format(time); } public List getFeatures() { ArrayList features = new ArrayList<>(); features.addAll(Arrays.asList(FEATURES)); if (mXmppConnectionService.confirmMessages()) { features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES)); } Collections.sort(features); return features; } }