Add support for signal.me links.

app/src/main/AndroidManifest.xml

@@ -275,6 +275,16 @@
             <data android:scheme="sgnl"
                   android:host="signal.tube" />
         </intent-filter>
+
+        <intent-filter>
+            <action android:name="android.intent.action.VIEW" />
+            <category android:name="android.intent.category.DEFAULT" />
+            <category android:name="android.intent.category.BROWSABLE" />
+            <data android:scheme="https"
+                android:host="signal.me" />
+            <data android:scheme="sgnl"
+                android:host="signal.me" />
+        </intent-filter>
     </activity>
 
     <activity android:name=".conversation.ConversationActivity"

app/src/main/java/org/thoughtcrime/securesms/MainActivity.java

@@ -49,6 +49,7 @@ protected void onCreate(Bundle savedInstanceState, boolean ready) {
 
     handleGroupLinkInIntent(getIntent());
     handleProxyInIntent(getIntent());
+    handleSignalMeIntent(getIntent());
 
     CachedInflater.from(this).clear();
   }
@@ -65,6 +66,7 @@ protected void onNewIntent(Intent intent) {
     super.onNewIntent(intent);
     handleGroupLinkInIntent(intent);
     handleProxyInIntent(intent);
+    handleSignalMeIntent(intent);
   }
 
   @Override
@@ -115,6 +117,13 @@ private void handleProxyInIntent(Intent intent) {
     }
   }
 
+  private void handleSignalMeIntent(Intent intent) {
+    Uri data = intent.getData();
+    if (data != null) {
+      CommunicationActions.handlePotentialSignalMeUrl(this, data.toString());
+    }
+  }
+
   @Override
   public @NonNull VoiceNoteMediaController getVoiceNoteMediaController() {
     return mediaController;

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

@@ -24,6 +24,7 @@
 import org.signal.core.util.logging.Log;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.WebRtcCallActivity;
+import org.thoughtcrime.securesms.contacts.sync.DirectoryHelper;
 import org.thoughtcrime.securesms.conversation.ConversationIntents;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.GroupDatabase;
@@ -37,6 +38,9 @@
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.sms.MessageSender;
 import org.thoughtcrime.securesms.util.concurrent.SimpleTask;
+import org.thoughtcrime.securesms.util.views.SimpleProgressDialog;
+
+import java.io.IOException;
 
 public class CommunicationActions {
 
@@ -225,6 +229,40 @@ public static boolean handlePotentialProxyLinkUrl(@NonNull FragmentActivity acti
     }
   }
 
+  /**
+   * If the url is a proxy link it will handle it.
+   * Otherwise returns false, indicating was not a proxy link.
+   */
+  public static boolean handlePotentialSignalMeUrl(@NonNull FragmentActivity activity, @NonNull String potentialUrl) {
+    String e164 = SignalMeUtil.parseE164FromLink(activity, potentialUrl);
+
+    if (e164 != null) {
+      SimpleProgressDialog.DismissibleDialog dialog = SimpleProgressDialog.showDelayed(activity, 500, 500);
+
+      SimpleTask.run(() -> {
+        Recipient recipient = Recipient.external(activity, e164);
+
+        if (!recipient.isRegistered() || !recipient.hasUuid()) {
+          try {
+            DirectoryHelper.refreshDirectoryFor(activity, recipient, false);
+            recipient = Recipient.resolved(recipient.getId());
+          } catch (IOException e) {
+            Log.w(TAG, "[handlePotentialMeUrl] Failed to refresh directory for new contact.");
+          }
+        }
+
+        return recipient;
+      }, recipient -> {
+        dialog.dismiss();
+        startConversation(activity, recipient, null);
+      });
+
+      return true;
+    } else {
+      return false;
+    }
+  }
+
   private static void startInsecureCallInternal(@NonNull Activity activity, @NonNull Recipient recipient) {
     try {
       Intent dialIntent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + recipient.requireSmsAddress()));

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

@@ -0,0 +1,43 @@
+package org.thoughtcrime.securesms.util;
+
+import android.content.Context;
+import android.telephony.PhoneNumberUtils;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.google.i18n.phonenumbers.PhoneNumberUtil;
+
+import org.thoughtcrime.securesms.phonenumbers.PhoneNumberFormatter;
+
+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 Pattern HOST_PATTERN = Pattern.compile("^(https|sgnl)://" + HOST + "/#p/(\\+[0-9]+)$");
+
+  /**
+   * If this is a valid signal.me link and has a valid e164, it will return the e164. Otherwise, it will return null.
+   */
+  public static @Nullable String parseE164FromLink(@NonNull Context context, @Nullable String link) {
+    if (Util.isEmpty(link)) {
+      return null;
+    }
+
+    Matcher matcher = HOST_PATTERN.matcher(link);
+
+    if (matcher.matches()) {
+      String e164 = matcher.group(2);
+
+      if (PhoneNumberUtil.getInstance().isPossibleNumber(e164, Locale.getDefault().getCountry())) {
+        return PhoneNumberFormatter.get(context).format(e164);
+      } else {
+        return null;
+      }
+    } else {
+      return null;
+    }
+  }
+}

app/src/test/java/org/thoughtcrime/securesms/util/SignalMeUtilText_parseE164FromLink.java

@@ -0,0 +1,50 @@
+package org.thoughtcrime.securesms.util;
+
+import android.app.Application;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.ParameterizedRobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static junit.framework.TestCase.assertEquals;
+
+@RunWith(ParameterizedRobolectricTestRunner.class)
+@Config(manifest = Config.NONE, application = Application.class)
+public class SignalMeUtilText_parseE164FromLink {
+
+  private final String input;
+  private final String output;
+
+  @ParameterizedRobolectricTestRunner.Parameters
+  public static Collection<Object[]> data() {
+    return Arrays.asList(new Object[][]{
+        { "https://signal.me/#p/+15555555555", "+15555555555" },
+        { "https://signal.me/#p/5555555555",   null },
+        { "https://signal.me",                 null },
+        { "https://signal.me/#p/",             null },
+        { "signal.me/#p/+15555555555",         null },
+        { "sgnl://signal.me/#p/+15555555555",  "+15555555555" },
+        { "sgnl://signal.me/#p/5555555555",    null },
+        { "sgnl://signal.me",                  null },
+        { "sgnl://signal.me/#p/",              null },
+        { "",                                  null },
+        { null,                                null }
+    });
+  }
+
+  public SignalMeUtilText_parseE164FromLink(String input, String output) {
+    this.input  = input;
+    this.output = output;
+  }
+
+  @Test
+  public void parse() {
+    assertEquals(output, SignalMeUtil.parseE164FromLink(ApplicationProvider.getApplicationContext(), input));
+  }
+}