1 files changed, 90 insertions, 0 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java
new file mode 100644
index 00000000..1c266545
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java
@@ -0,0 +1,90 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import android.util.Base64;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
+import de.thedevstack.conversationsplus.xmpp.Xep;
+import de.thedevstack.conversationsplus.xmpp.chatstate.ChatState;
+import de.tzur.conversations.Settings;
+
+/**
+ */
+public final class FeatureRegistry {
+    public static final String IDENTITY_TYPE = "phone";
+
+    private static final String[] LEGACY_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",
+            ChatState.NAMESPACE,
+            AxolotlService.PEP_DEVICE_LIST+"+notify"};
+    private static final String[] LEGACY_MESSAGE_CONFIRMATION_FEATURES = {
+            "urn:xmpp:chat-markers:0",
+            "urn:xmpp:receipts"
+    };
+    private final List<String> features = new ArrayList<>();
+    private static final FeatureRegistry INSTANCE = new FeatureRegistry();
+
+    public static void add(String featureNamespace) {
+        if (null != featureNamespace) {
+            INSTANCE.features.add(featureNamespace);
+        }
+    }
+
+    public static void remove(String featureNamespace) {
+        if (null != featureNamespace && INSTANCE.features.contains(featureNamespace)) {
+            INSTANCE.features.remove(featureNamespace);
+        }
+    }
+    public static void add(Xep xep) {
+        add(xep.featureNamespace());
+    }
+
+    public static void remove(Xep xep) {
+        remove(xep.featureNamespace());
+    }
+
+    public static List<String> getFeatures() {
+        Collections.sort(INSTANCE.features);
+        return INSTANCE.features;
+    }
+
+    public static 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));
+    }
+
+    private FeatureRegistry() {
+        this.features.addAll(Arrays.asList(LEGACY_FEATURES));
+        if (Settings.CONFIRM_MESSAGE_RECEIVED) {
+            this.features.addAll(Arrays.asList(LEGACY_MESSAGE_CONFIRMATION_FEATURES));
+        }
+    }
+}