1 files changed, 74 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java b/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java
new file mode 100644
index 00000000..649f767d
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java
@@ -0,0 +1,74 @@
+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 de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.tzur.conversations.Settings;
+import eu.siacs.conversations.crypto.axolotl.AxolotlService;
+
+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",
+			"http://jabber.org/protocol/nick+notify",
+			"urn:xmpp:ping",
+			"jabber:iq:version",
+			"http://jabber.org/protocol/chatstates",
+			AxolotlService.PEP_DEVICE_LIST+"+notify"};
+	private final String[] MESSAGE_CONFIRMATION_FEATURES = {
+			"urn:xmpp:chat-markers:0",
+			"urn:xmpp:receipts"
+	};
+	protected final String IDENTITY_TYPE = "phone";
+
+	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
+
+	public String getCapHash() {
+		StringBuilder s = new StringBuilder();
+		s.append("client/" + IDENTITY_TYPE + "//" + ConversationsPlusApplication.getNameAndVersion() + "<");
+		MessageDigest md;
+		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));
+	}
+
+	public static String getTimestamp(long time) {
+		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
+		return DATE_FORMAT.format(time);
+	}
+
+	public List<String> getFeatures() {
+		ArrayList<String> features = new ArrayList<>();
+		features.addAll(Arrays.asList(FEATURES));
+		if (Settings.CONFIRM_MESSAGE_RECEIVED) {
+			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
+		}
+		Collections.sort(features);
+		return features;
+	}
+}