1 files changed, 48 insertions, 0 deletions
diff --git a/conversations/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java b/conversations/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java
new file mode 100644
index 00000000..c96d116d
--- /dev/null
+++ b/conversations/src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java
@@ -0,0 +1,48 @@
+package eu.siacs.conversations.generator;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import eu.siacs.conversations.services.XmppConnectionService;
+
+import android.util.Base64;
+
+public abstract class AbstractGenerator {
+	public 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", "urn:xmpp:receipts",
+			"urn:xmpp:chat-markers:0", "http://jabber.org/protocol/muc",
+			"jabber:x:conference", "http://jabber.org/protocol/caps",
+			"http://jabber.org/protocol/disco#info",
+			"urn:xmpp:avatar:metadata+notify" };
+	public final String IDENTITY_NAME = "Conversations 0.7";
+	public final String IDENTITY_TYPE = "phone";
+
+	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;
+		}
+		List<String> features = Arrays.asList(FEATURES);
+		Collections.sort(features);
+		for (String feature : features) {
+			s.append(feature + "<");
+		}
+		byte[] sha1 = md.digest(s.toString().getBytes());
+		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
+	}
+}