directory changes to use number instead of token, group ui progress

library/src/org/whispersystems/textsecure/util/DirectoryUtil.java

@@ -0,0 +1,33 @@
+package org.whispersystems.textsecure.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+public class DirectoryUtil {
+
+  public static String getDirectoryServerToken(String e164number) {
+    try {
+      MessageDigest digest = MessageDigest.getInstance("SHA1");
+      byte[]        token  = Util.trim(digest.digest(e164number.getBytes()), 10);
+      return Base64.encodeBytesWithoutPadding(token);
+    } catch (NoSuchAlgorithmException e) {
+      throw new AssertionError(e);
+    }
+  }
+
+  /**
+   * Get a mapping of directory server tokens to their requested number.
+   * @param e164numbers
+   * @return map with token as key, E164 number as value
+   */
+  public static Map<String, String> getDirectoryServerTokenMap(Collection<String> e164numbers) {
+    final Map<String,String> tokenMap = new HashMap<String,String>(e164numbers.size());
+    for (String number : e164numbers) {
+      tokenMap.put(getDirectoryServerToken(number), number);
+    }
+    return tokenMap;
+  }
+}