Support "quick response" when SMSSecure is unlocked.

Fixes signalapp/Signal-Android#299
Closes signalapp/Signal-Android#3456
// FREEBIE

res/values/strings.xml

@@ -342,7 +342,9 @@
     <string name="MessageNotifier_media_message">Media message</string>
 
     <!-- QuickResponseService -->
-    <string name="QuickResponseService_sorry_quick_response_is_not_yet_supported_by_textsecure">Sorry, Quick Response is not yet supported by SMSSecure!</string>
+    <string name="QuickResponseService_quick_response_unavailable_when_SMSSecure_is_locked">Quick response unavailable when SMSSecure is locked!</string>
+    <string name="QuickResponseService_problem_sending_message">Problem sending message!</string>
+
 
     <!-- change_passphrase_activity -->
     <string name="change_passphrase_activity__old_passphrase">OLD PASSPHRASE:</string>

src/org/smssecure/smssecure/service/MasterSecretIntentService.java

@@ -0,0 +1,21 @@
+package org.smssecure.smssecure.service;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.support.annotation.Nullable;
+
+import org.smssecure.smssecure.crypto.MasterSecret;
+
+public abstract class MasterSecretIntentService extends IntentService {
+
+  public MasterSecretIntentService(String name) {
+    super(name);
+  }
+
+  @Override
+  protected final void onHandleIntent(Intent intent) {
+    onHandleIntent(intent, KeyCachingService.getMasterSecret(this));
+  }
+
+  protected abstract void onHandleIntent(Intent intent, @Nullable MasterSecret masterSecret);
+}

src/org/smssecure/smssecure/service/QuickResponseService.java

@@ -1,31 +1,62 @@
 package org.smssecure.smssecure.service;
 
-import android.app.Service;
 import android.content.Intent;
-import android.os.IBinder;
+import android.support.annotation.Nullable;
 import android.telephony.TelephonyManager;
+import android.text.TextUtils;
 import android.util.Log;
 import android.widget.Toast;
 
 import org.smssecure.smssecure.R;
+import org.smssecure.smssecure.crypto.MasterSecret;
+import org.smssecure.smssecure.database.ThreadDatabase;
+import org.smssecure.smssecure.mms.OutgoingMediaMessage;
+import org.smssecure.smssecure.mms.SlideDeck;
+import org.smssecure.smssecure.recipients.RecipientFactory;
+import org.smssecure.smssecure.recipients.Recipients;
+import org.smssecure.smssecure.sms.MessageSender;
+import org.smssecure.smssecure.sms.OutgoingTextMessage;
+import org.smssecure.smssecure.util.Rfc5724Uri;
 
-public class QuickResponseService extends Service {
+import java.net.URISyntaxException;
 
-  public int onStartCommand(Intent intent, int flags, int startId) {
-    if (!TelephonyManager.ACTION_RESPOND_VIA_MESSAGE.equals(intent.getAction())) {
-      Log.w("QuickResponseService", "Received unknown intent: " + intent.getAction());
-      return START_NOT_STICKY;
-    }
+public class QuickResponseService extends MasterSecretIntentService {
 
-    Toast.makeText(this,
-                   getString(R.string.QuickResponseService_sorry_quick_response_is_not_yet_supported_by_textsecure),
-                   Toast.LENGTH_LONG).show();
+  private static final String TAG = QuickResponseService.class.getSimpleName();
 
-    return START_NOT_STICKY;
+  public QuickResponseService() {
+    super("QuickResponseService");
   }
 
   @Override
-  public IBinder onBind(Intent intent) {
-    return null;
+  protected void onHandleIntent(Intent intent, @Nullable MasterSecret masterSecret) {
+    if (!TelephonyManager.ACTION_RESPOND_VIA_MESSAGE.equals(intent.getAction())) {
+      Log.w(TAG, "Received unknown intent: " + intent.getAction());
+      return;
+    }
+
+    if (masterSecret == null) {
+      Log.w(TAG, "Got quick response request when locked...");
+      Toast.makeText(this, R.string.QuickResponseService_quick_response_unavailable_when_SMSSecure_is_locked, Toast.LENGTH_LONG).show();
+      return;
+    }
+
+    try {
+      Rfc5724Uri uri        = new Rfc5724Uri(intent.getDataString());
+      String     content    = intent.getStringExtra(Intent.EXTRA_TEXT);
+      Recipients recipients = RecipientFactory.getRecipientsFromString(this, uri.getPath(), false);
+
+      if (!TextUtils.isEmpty(content)) {
+        if (recipients.isSingleRecipient()) {
+          MessageSender.send(this, masterSecret, new OutgoingTextMessage(recipients, content), -1, false);
+        } else {
+          MessageSender.send(this, masterSecret, new OutgoingMediaMessage(this, recipients, new SlideDeck(), content,
+                                                                          ThreadDatabase.DistributionTypes.DEFAULT), -1, false);
+        }
+      }
+    } catch (URISyntaxException e) {
+      Toast.makeText(this, R.string.QuickResponseService_problem_sending_message, Toast.LENGTH_LONG).show();
+      Log.w(TAG, e);
+    }
   }
 }