Use a fileprovider to open videos in external apps

Slightly adjusted version of #322

Clover/app/src/main/AndroidManifest.xml

@@ -95,6 +95,18 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
         </receiver>
 
+        <provider
+            android:name="android.support.v4.content.FileProvider"
+            android:authorities="org.floens.chan.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+
+        </provider>
+
     </application>
 
 </manifest>

Clover/app/src/main/java/org/floens/chan/core/cache/FileCacheProvider.java

@@ -0,0 +1,36 @@
+/*
+ * Clover - 4chan browser https://github.com/Floens/Clover/
+ * Copyright (C) 2014  Floens
+ *
+ * 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.floens.chan.core.cache;
+
+import android.content.Context;
+import android.net.Uri;
+import android.support.v4.content.FileProvider;
+
+import org.floens.chan.utils.AndroidUtils;
+
+import java.io.File;
+
+public class FileCacheProvider {
+    // Same as the one defined in the manifest.
+    private static final String AUTHORITY = "org.floens.chan.fileprovider";
+
+    public static Uri getUriForFile(File file) {
+        Context applicationContext = AndroidUtils.getAppContext();
+        return FileProvider.getUriForFile(applicationContext, AUTHORITY, file);
+    }
+}

Clover/app/src/main/java/org/floens/chan/core/di/NetModule.java

@@ -37,6 +37,11 @@ public class NetModule {
     }
 
     private File getCacheDir(Context applicationContext) {
-        return applicationContext.getExternalCacheDir() != null ? applicationContext.getExternalCacheDir() : applicationContext.getCacheDir();
+        // See also res/xml/filepaths.xml for the fileprovider.
+        if (applicationContext.getExternalCacheDir() != null) {
+            return applicationContext.getExternalCacheDir();
+        } else {
+            return applicationContext.getCacheDir();
+        }
     }
 }

Clover/app/src/main/java/org/floens/chan/ui/view/MultiImageView.java

@@ -22,9 +22,7 @@ import android.content.ContextWrapper;
 import android.content.Intent;
 import android.media.AudioManager;
 import android.media.MediaPlayer;
-import android.net.Uri;
 import android.os.Build;
-import android.os.StrictMode;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.View;
@@ -40,9 +38,10 @@ import com.android.volley.toolbox.ImageLoader.ImageContainer;
 import com.davemorrissey.labs.subscaleview.ImageSource;
 
 import org.floens.chan.R;
-import org.floens.chan.core.cache.FileCacheListener;
 import org.floens.chan.core.cache.FileCache;
 import org.floens.chan.core.cache.FileCacheDownloader;
+import org.floens.chan.core.cache.FileCacheListener;
+import org.floens.chan.core.cache.FileCacheProvider;
 import org.floens.chan.core.model.PostImage;
 import org.floens.chan.core.settings.ChanSettings;
 import org.floens.chan.utils.AndroidUtils;
@@ -386,16 +385,10 @@ public class MultiImageView extends FrameLayout implements View.OnClickListener
     private void setVideoFile(final File file) {
         if (ChanSettings.videoOpenExternal.get()) {
             Intent intent = new Intent(Intent.ACTION_VIEW);
-            intent.setDataAndType(Uri.fromFile(file), "video/*");
-
-            {
-                StrictMode.VmPolicy vmPolicy = StrictMode.getVmPolicy();
-                StrictMode.setVmPolicy(StrictMode.VmPolicy.LAX);
+            intent.setDataAndType(FileCacheProvider.getUriForFile(file), "video/*");
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 
-                AndroidUtils.openIntent(intent);
-
-                StrictMode.setVmPolicy(vmPolicy);
-            }
+            AndroidUtils.openIntent(intent);
 
             onModeLoaded(Mode.MOVIE, videoView);
         } else {

Clover/app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+
+    <!-- Corresponds to the file path chosen in the NetModule.getCacheDir method -->
+    <cache-path
+        name="fc"
+        path="filecache/" />
+    <external-cache-path
+        name="exfc"
+        path="filecache/" />
+
+</paths>