1 files changed, 115 insertions, 0 deletions
diff --git a/android/app/src/main/java/com/classicube/CCFileProvider.java b/android/app/src/main/java/com/classicube/CCFileProvider.java
new file mode 100644
index 0000000..a0883a0
--- /dev/null
+++ b/android/app/src/main/java/com/classicube/CCFileProvider.java
@@ -0,0 +1,115 @@
+package com.classicube;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.pm.ProviderInfo;
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.provider.MediaStore;
+import android.provider.OpenableColumns;
+
+public class CCFileProvider extends ContentProvider
+{
+    final static String[] DEFAULT_COLUMNS = { OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE, MediaStore.MediaColumns.DATA };
+    File root;
+
+    @Override
+    public boolean onCreate() {
+        return true;
+    }
+
+    @Override
+    public void attachInfo(Context context, ProviderInfo info) {
+        super.attachInfo(context, info);
+        root = context.getExternalFilesDir(null); // getGameDataDirectory
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        File file = getFileForUri(uri);
+        // can be null when caller is requesting all columns
+        if (projection == null) projection = DEFAULT_COLUMNS;
+
+        ArrayList<String> cols = new ArrayList<String>(3);
+        ArrayList<Object> vals = new ArrayList<Object>(3);
+
+        for (String column : projection) {
+            if (column.equals(OpenableColumns.DISPLAY_NAME)) {
+                cols.add(OpenableColumns.DISPLAY_NAME);
+                vals.add(file.getName());
+            } else if (column.equals(OpenableColumns.SIZE)) {
+                cols.add(OpenableColumns.SIZE);
+                vals.add(file.length());
+            } else if (column.equals(MediaStore.MediaColumns.DATA)) {
+                cols.add(MediaStore.MediaColumns.DATA);
+                vals.add(file.getAbsolutePath());
+            }
+        }
+
+        // https://stackoverflow.com/questions/4042434/converting-arrayliststring-to-string-in-java
+        MatrixCursor cursor = new MatrixCursor(cols.toArray(new String[0]), 1);
+        cursor.addRow(vals.toArray());
+        return cursor;
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        String path = uri.getEncodedPath();
+        int sepExt  = path.lastIndexOf('.');
+
+        if (sepExt >= 0) {
+            String fileExt = path.substring(sepExt);
+            if (fileExt.equals(".png")) return "image/png";
+        }
+        return "application/octet-stream";
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
+        File file = getFileForUri(uri);
+        return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
+    }
+
+    public static Uri getUriForFile(String path) {
+        // See AndroidManifest.xml for authority
+        return new Uri.Builder()
+                .scheme("content")
+                .authority("com.classicube.android.client.provider")
+                .encodedPath(Uri.encode(path, "/"))
+                .build();
+    }
+
+    File getFileForUri(Uri uri) {
+        String path = uri.getPath();
+        File file   = new File(root, path);
+
+        file = file.getAbsoluteFile();
+        // security validation check
+        if (!file.getPath().startsWith(root.getPath())) {
+            throw new SecurityException("Resolved path lies outside app directory:" + path);
+        }
+        return file;
+    }
+}