Add signal.me username support.

app/src/main/java/org/thoughtcrime/securesms/util/CommunicationActions.java

@@ -41,8 +41,10 @@ import org.thoughtcrime.securesms.proxy.ProxyBottomSheetFragment;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.sms.MessageSender;
 import org.thoughtcrime.securesms.util.views.SimpleProgressDialog;
+import org.whispersystems.signalservice.api.push.ServiceId;
 
 import java.io.IOException;
+import java.util.Optional;
 
 public class CommunicationActions {
 
@@ -266,36 +268,49 @@ public class CommunicationActions {
   }
 
   /**
-   * If the url is a proxy link it will handle it.
+   * If the url is a signal.me link it will handle it.
-   * Otherwise returns false, indicating was not a proxy link.
    */
-  public static boolean handlePotentialSignalMeUrl(@NonNull FragmentActivity activity, @NonNull String potentialUrl) {
+  public static void handlePotentialSignalMeUrl(@NonNull FragmentActivity activity, @NonNull String potentialUrl) {
     String e164     = SignalMeUtil.parseE164FromLink(activity, potentialUrl);
+    String username = SignalMeUtil.parseUsernameFromLink(potentialUrl);
 
-    if (e164 != null) {
+    if (e164 != null || username != null) {
       SimpleProgressDialog.DismissibleDialog dialog = SimpleProgressDialog.showDelayed(activity, 500, 500);
 
       SimpleTask.run(() -> {
-        Recipient recipient = Recipient.external(activity, e164);
+        Recipient recipient = Recipient.UNKNOWN;
+        if (e164 != null) {
+           recipient = Recipient.external(activity, e164);
 
           if (!recipient.isRegistered() || !recipient.hasServiceId()) {
             try {
               ContactDiscovery.refresh(activity, recipient, false);
               recipient = Recipient.resolved(recipient.getId());
             } catch (IOException e) {
-            Log.w(TAG, "[handlePotentialMeUrl] Failed to refresh directory for new contact.");
+              Log.w(TAG, "[handlePotentialSignalMeUrl] Failed to refresh directory for new contact.");
+            }
+          }
+        } else {
+          Optional<ServiceId> serviceId = UsernameUtil.fetchAciForUsername(username);
+          if (serviceId.isPresent()) {
+            recipient = Recipient.externalUsername(serviceId.get(), username);
           }
         }
 
         return recipient;
       }, recipient -> {
         dialog.dismiss();
-        startConversation(activity, recipient, null);
-      });
 
-      return true;
+        if (recipient != Recipient.UNKNOWN) {
-    } else {
+          startConversation(activity, recipient, null);
-      return false;
+        } else if (username != null) {
+          new MaterialAlertDialogBuilder(activity)
+              .setTitle(R.string.ContactSelectionListFragment_username_not_found)
+              .setMessage(activity.getString(R.string.ContactSelectionListFragment_s_is_not_a_signal_user, username))
+              .setPositiveButton(android.R.string.ok, null)
+              .show();
+        }
+      });
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/util/SignalMeUtil.java

@@ -9,13 +9,17 @@ import com.google.i18n.phonenumbers.PhoneNumberUtil;
 
 import org.thoughtcrime.securesms.phonenumbers.PhoneNumberFormatter;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 class SignalMeUtil {
-  private static final String  HOST         = "signal.me";
+  private static final String  HOST             = "^(https|sgnl)://" + "signal\\.me";
-  private static final Pattern HOST_PATTERN = Pattern.compile("^(https|sgnl)://" + HOST + "/#p/(\\+[0-9]+)$");
+  private static final Pattern E164_PATTERN     = Pattern.compile(HOST + "/#p/(\\+[0-9]+)$");
+  private static final Pattern USERNAME_PATTERN = Pattern.compile(HOST + "/#u/(.+)$");
 
   /**
    * If this is a valid signal.me link and has a valid e164, it will return the e164. Otherwise, it will return null.
@@ -25,7 +29,7 @@ class SignalMeUtil {
       return null;
     }
 
-    Matcher matcher = HOST_PATTERN.matcher(link);
+    Matcher matcher = E164_PATTERN.matcher(link);
 
     if (matcher.matches()) {
       String e164 = matcher.group(2);
@@ -39,4 +43,26 @@ class SignalMeUtil {
       return null;
     }
   }
+
+  /**
+   * If this is a valid signal.me link and has a valid username, it will return the username. Otherwise, it will return null.
+   */
+  public static @Nullable String parseUsernameFromLink(@Nullable String link) {
+    if (Util.isEmpty(link)) {
+      return null;
+    }
+
+    Matcher matcher = USERNAME_PATTERN.matcher(link);
+
+    if (matcher.matches()) {
+      String username = matcher.group(2);
+      try {
+        return username == null || username.isEmpty() ? null : URLDecoder.decode(username, StandardCharsets.UTF_8.toString());
+      } catch (UnsupportedEncodingException e) {
+        return null;
+      }
+    } else {
+      return null;
+    }
+  }
 }