ACardEmulator: Added F-Droid build flavor with FOSS only

- avoid precompiled JARs for JCardSim
- use gradle's shadow plugin to relocate JCardSim's use of Bouncycastle
- removes JCardSim's Hello world applet
- use vJCRE to avoid importing Oracle's api_classic.jar

(We may use vJCRE as full replacement for JCardSim in the future, but
JCardSim is currently the choice with more features and support)

ACardEmulator/app/src/fdroid/java/com/vsmartcard/acardemulator/SmartcardProviderService.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2019 Frank Morgner
+ *
+ * This file is part of RemoteSmartCardReader.
+ *
+ * RemoteSmartCardReader is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * RemoteSmartCardReader is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * RemoteSmartCardReader.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.vsmartcard.acardemulator;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.support.annotation.Nullable;
+
+public class SmartcardProviderService extends IntentService {
+    public SmartcardProviderService () {
+        super("SmartcardProviderService");
+    }
+
+    @Override
+    protected void onHandleIntent(@Nullable Intent intent) {
+    }
+}

ACardEmulator/app/src/main/java/com/vsmartcard/acardemulator/MainActivity.java

@@ -175,4 +175,4 @@ public class MainActivity extends AppCompatActivity {
             dialog.dismiss();
         super.onPause();
     }
-}
+}

ACardEmulator/app/src/main/java/com/vsmartcard/acardemulator/SettingsActivity.java

@@ -214,18 +214,22 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
                 }
             });
 
-            Preference gear_nfc = findPreference("gear_nfc");
-            gear_nfc.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
-                public boolean onPreferenceClick(Preference preference) {
-                    String gearPackage = "com.samsung.android.gearoplugin";
-                    try {
-                        startActivity(new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("market://details?id="+gearPackage)));
-                    } catch (android.content.ActivityNotFoundException e) {
-                        startActivity(new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id="+gearPackage)));
+            final Preference gear_nfc = findPreference("gear_nfc");
+            if (BuildConfig.FLAVOR.equals("fdroid")) {
+                gear_nfc.setSummary("Samsung Gear integration is disabled in F-Droid");
+            } else {
+                gear_nfc.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+                    public boolean onPreferenceClick(Preference preference) {
+                        String gearPackage = "com.samsung.android.gearoplugin";
+                        try {
+                            startActivity(new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("market://details?id="+gearPackage)));
+                        } catch (android.content.ActivityNotFoundException e) {
+                            startActivity(new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id="+gearPackage)));
+                        }
+                        return true;
                     }
-                    return true;
-                }
-            });
+                });
+            }
         }
 
         @Override
@@ -288,4 +292,4 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
         // onResume gets called after this to handle the intent
         setIntent(intent);
     }
-}
+}

ACardEmulator/app/src/main/java/com/vsmartcard/acardemulator/emulators/JCEmulator.java

@@ -6,7 +6,6 @@ import android.support.v4.content.LocalBroadcastManager;
 
 import com.licel.jcardsim.base.Simulator;
 import com.licel.jcardsim.base.SimulatorRuntime;
-import com.licel.jcardsim.samples.HelloWorldApplet;
 import com.licel.jcardsim.utils.AIDUtil;
 import com.mysmartlogon.gidsApplet.GidsApplet;
 import com.vsmartcard.acardemulator.R;
@@ -33,18 +32,6 @@ public class JCEmulator implements Emulator {
         String aid, name, extra_install = "", extra_error = "";
         simulator = new Simulator(new SimulatorRuntime());
 
-        if (activate_helloworld) {
-            name = context.getResources().getString(R.string.applet_helloworld);
-            aid = context.getResources().getString(R.string.aid_helloworld);
-            try {
-                simulator.installApplet(AIDUtil.create(aid), HelloWorldApplet.class);
-                extra_install += "\n" + name + " (AID: " + aid + ")";
-            } catch (Exception e) {
-                e.printStackTrace();
-                extra_error += "\n" + "Could not install " + name + " (AID: " + aid + ")";
-            }
-        }
-
         if (activate_openpgp) {
             name = context.getResources().getString(R.string.applet_openpgp);
             aid = context.getResources().getString(R.string.aid_openpgp);

ACardEmulator/app/src/main/res/values/strings.xml

@@ -26,8 +26,6 @@
     <string name="aid_pivapplet_truncated3">A00000030800</string>
     <string name="aid_pivapplet_truncated4">A000000308</string>
     <string name="applet_pivapplet">Alex Wilson\'s PIV Applet</string>
-    <string name="aid_helloworld">F000000001</string>
-    <string name="applet_helloworld">jCardSim Team\'s Hello World Applet</string>
     <string name="aid_partial_openpgp">D27600012401</string>
     <string name="aid_openpgp">D2760001240102000000000000010000</string>
     <string name="applet_openpgp">Yubico\'s OpenPGP Applet</string>
@@ -36,7 +34,6 @@
     <string name="startup_title">Tap To Emulate!</string>
     <string name="startup_message">The following smart card applets are supported:\n
         \n
-        <b>Hello World Applet</b> <small>(AID F000000001)</small>\n
         <b>OpenPGP Applet</b> <small>(AID D2760001240102000000000000010000)</small>\n
         <b>OATH Applet</b> <small>(AID A000000527210101)</small>\n
         <b>PIV Applet</b> <small>(AID A00000030800001000)</small>\n

ACardEmulator/app/src/main/res/xml/aid_list.xml

@@ -4,10 +4,6 @@
     android:description="@string/app_name"
     android:requireDeviceUnlock="false">
 
-    <aid-group android:description="@string/applet_helloworld" android:category="other">
-        <aid-filter android:name="@string/aid_helloworld"/>
-    </aid-group>
-
     <aid-group android:description="@string/applet_openpgp" android:category="other">
         <aid-filter android:name="@string/aid_openpgp"/>
         <aid-filter android:name="@string/aid_partial_openpgp"/>

ACardEmulator/app/src/main/res/xml/settings.xml

@@ -13,12 +13,6 @@
         android:key="jc_settings"
         >
 
-        <SwitchPreference
-            android:title="@string/applet_helloworld"
-            android:switchTextOn="@string/aid_helloworld"
-            android:key="activate_helloworld"
-            android:defaultValue="false"
-            />
         <SwitchPreference
             android:title="@string/applet_openpgp"
             android:switchTextOn="@string/aid_openpgp"
@@ -100,7 +94,7 @@
 
         <Preference
             android:title="Emulation with Gear's NFC"
-            android:summary="Samsung Gear needs to be installed for using the Gear's NFC emulation capabilities."
+            android:summary="Samsung Gear needs to be installed for using the Gear's NFC emulation capabilities. (Disabled on F-Droid)"
             android:key="gear_nfc">
         </Preference>