Allow exporting to zip file

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/app/src/main/java/com/wireguard/android/activity/SettingsActivity.java b/app/src/main/java/com/wireguard/android/activity/SettingsActivity.java
index e3cd46b1..41761b32 100644
--- a/app/src/main/java/com/wireguard/android/activity/SettingsActivity.java
+++ b/app/src/main/java/com/wireguard/android/activity/SettingsActivity.java
@@ -1,6 +1,7 @@
 package com.wireguard.android.activity;
 
 import android.app.Activity;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
@@ -9,11 +10,60 @@ import com.wireguard.android.Application;
 import com.wireguard.android.R;
 import com.wireguard.android.backend.WgQuickBackend;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+
 /**
  * Interface for changing application-global persistent settings.
  */
 
 public class SettingsActivity extends Activity {
+    @FunctionalInterface
+    public interface PermissionRequestCallback {
+        void done(String[] permissions, int[] grantResults);
+    }
+
+    private HashMap<Integer, PermissionRequestCallback> permissionRequestCallbacks = new HashMap<>();
+    private int permissionRequestCounter = 0;
+
+    public synchronized void ensurePermissions(String[] permissions, PermissionRequestCallback cb) {
+        /* TODO(MSF): since when porting to AppCompat, you'll be replacing checkSelfPermission
+         * and requestPermission with AppCompat.checkSelfPermission and AppCompat.requestPermission,
+         * you can remove this SDK_INT block entirely here, and count on the compat lib to do
+         * the right thing. */
+        if (android.os.Build.VERSION.SDK_INT < 23) {
+            int[] granted = new int[permissions.length];
+            Arrays.fill(granted, PackageManager.PERMISSION_GRANTED);
+            cb.done(permissions, granted);
+        } else {
+            List<String> needPermissions = new ArrayList<>(permissions.length);
+            for (final String permission : permissions) {
+                if (getApplicationContext().checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED)
+                    needPermissions.add(permission);
+            }
+            if (needPermissions.isEmpty()) {
+                int[] granted = new int[permissions.length];
+                Arrays.fill(granted, PackageManager.PERMISSION_GRANTED);
+                cb.done(permissions, granted);
+                return;
+            }
+            int idx = permissionRequestCounter++;
+            permissionRequestCallbacks.put(idx, cb);
+            requestPermissions(needPermissions.toArray(new String[needPermissions.size()]), idx);
+        }
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+        final PermissionRequestCallback f = permissionRequestCallbacks.get(requestCode);
+        if (f != null) {
+            permissionRequestCallbacks.remove(requestCode);
+            f.done(permissions, grantResults);
+        }
+    }
+
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);