Handle denied storage permission, use ContentResolver.SCHEME_FILE constant

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptListFragment.java

@@ -29,6 +29,7 @@ import android.Manifest;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ClipDescription;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.LabeledIntent;
@@ -635,7 +636,7 @@ public class DecryptListFragment
      * see https://commonsware.com/blog/2015/10/07/runtime-permissions-files-action-send.html
      */
     private boolean checkAndRequestReadPermission(Activity activity, final Uri uri) {
-        if ( ! "file".equals(uri.getScheme())) {
+        if ( ! ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
             return true;
         }
 
@@ -676,7 +677,7 @@ public class DecryptListFragment
             Iterator<Uri> it = mCancelledInputUris.iterator();
             while (it.hasNext()) {
                 Uri uri = it.next();
-                if ( ! "file".equals(uri.getScheme())) {
+                if ( ! ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
                     continue;
                 }
                 it.remove();
@@ -694,7 +695,7 @@ public class DecryptListFragment
             Iterator<Uri> it = mPendingInputUris.iterator();
             while (it.hasNext()) {
                 Uri uri = it.next();
-                if ( ! "file".equals(uri.getScheme())) {
+                if ( ! ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
                     continue;
                 }
                 it.remove();

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java

@@ -31,6 +31,7 @@ import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ClipData;
 import android.content.ClipboardManager;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -55,6 +56,7 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
@@ -267,7 +269,7 @@ public class EncryptFilesFragment
      * see https://commonsware.com/blog/2015/10/07/runtime-permissions-files-action-send.html
      */
     private boolean checkAndRequestReadPermission(final Uri uri) {
-        if ( ! "file".equals(uri.getScheme())) {
+        if ( ! ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
             return true;
         }
 
@@ -305,8 +307,9 @@ public class EncryptFilesFragment
             // permission granted -> restart processing uris
             processPendingInputUris();
         } else {
-            // permission denied ->
+            Toast.makeText(getActivity(), R.string.error_denied_storage_permission, Toast.LENGTH_LONG).show();
-
+            getActivity().setResult(Activity.RESULT_CANCELED);
+            getActivity().finish();
         }
     }
 

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java

@@ -161,7 +161,7 @@ public class FileHelper {
     }
 
     public static long getFileSize(Context context, Uri uri, long def) {
-        if ("file".equals(uri.getScheme())) {
+        if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
             long size = new File(uri.getPath()).length();
             if (size == 0) {
                 size = def;
@@ -293,7 +293,7 @@ public class FileHelper {
         }
         out.close();
 
-        if ("file".equals(uri.getScheme())) {
+        if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
             return new File(uri.getPath()).delete() ? 1 : 0;
         } else {
             return resolver.delete(uri, null, null);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelperLollipop.java

@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package org.sufficientlysecure.keychain.util;
 
 

OpenKeychain/src/main/res/values/strings.xml

@@ -375,6 +375,7 @@
     <string name="error_nothing_import_selected">"No keys selected for import!"</string>
     <string name="error_contacts_key_id_missing">"Retrieving the key ID from contacts failed!"</string>
     <string name="error_generic_report_bug">"A generic error occurred, please create a new bug report for OpenKeychain."</string>
+    <string name="error_denied_storage_permission">"Can not read files from storage because access has been denied!"</string>
 
     <!-- results shown after decryption/verification -->
     <string name="decrypt_result_no_signature">"Not Signed"</string>