1 files changed, 193 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/utils/FileUtils.java b/src/main/java/eu/siacs/conversations/utils/FileUtils.java
new file mode 100644
index 00000000..7783bcc9
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/utils/FileUtils.java
@@ -0,0 +1,193 @@
+package eu.siacs.conversations.utils;
+
+import android.annotation.SuppressLint;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Environment;
+import android.provider.DocumentsContract;
+import android.provider.MediaStore;
+
+import java.io.File;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+
+public final class FileUtils {
+
+	/**
+	 * Get a file path from a Uri. This will get the the path for Storage Access
+	 * Framework Documents, as well as the _data field for the MediaStore and
+	 * other file-based ContentProviders.
+	 *
+	 * @param uri     The Uri to query.
+	 * @author paulburke
+	 */
+	@SuppressLint("NewApi")
+	public static String getPath(final Uri uri) {
+		if (uri == null) {
+			return null;
+		}
+
+		final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
+        final Context context = ConversationsPlusApplication.getAppContext();
+		// DocumentProvider
+		if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
+			// ExternalStorageProvider
+			if (isExternalStorageDocument(uri)) {
+				final String docId = DocumentsContract.getDocumentId(uri);
+				final String[] split = docId.split(":");
+				final String type = split[0];
+
+				if ("primary".equalsIgnoreCase(type)) {
+					return Environment.getExternalStorageDirectory() + "/" + split[1];
+				}
+
+				// TODO handle non-primary volumes
+			}
+			// DownloadsProvider
+			else if (isDownloadsDocument(uri)) {
+
+				final String id = DocumentsContract.getDocumentId(uri);
+				final Uri contentUri = ContentUris.withAppendedId(
+						Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
+
+				return getDataColumn(context, contentUri, null, null);
+			}
+			// MediaProvider
+			else if (isMediaDocument(uri)) {
+				final String docId = DocumentsContract.getDocumentId(uri);
+				final String[] split = docId.split(":");
+				final String type = split[0];
+
+				Uri contentUri = null;
+				if ("image".equals(type)) {
+					contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
+				} else if ("video".equals(type)) {
+					contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
+				} else if ("audio".equals(type)) {
+					contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
+				}
+
+				final String selection = "_id=?";
+				final String[] selectionArgs = new String[]{
+						split[1]
+				};
+
+				return getDataColumn(context, contentUri, selection, selectionArgs);
+			}
+		}
+		// MediaStore (and general)
+		else if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
+			String path = getDataColumn(context, uri, null, null);
+			if (path != null) {
+				File file = new File(path);
+				if (!file.canRead()) {
+					return null;
+				}
+			}
+			return path;
+		}
+		// File
+		else if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
+			return uri.getPath();
+		}
+
+		return null;
+	}
+
+	/**
+	 * Get the value of the data column for this Uri. This is useful for
+	 * MediaStore Uris, and other file-based ContentProviders.
+	 *
+	 * @param context       The context.
+	 * @param uri           The Uri to query.
+	 * @param selection     (Optional) Filter used in the query.
+	 * @param selectionArgs (Optional) Selection arguments used in the query.
+	 * @return The value of the _data column, which is typically a file path.
+	 */
+	private static String getDataColumn(Context context, Uri uri, String selection,
+									   String[] selectionArgs) {
+
+		Cursor cursor = null;
+		final String column = "_data";
+		final String[] projection = {
+				column
+		};
+
+		try {
+			cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,null);
+			if (cursor != null && cursor.moveToFirst()) {
+				final int column_index = cursor.getColumnIndexOrThrow(column);
+				return cursor.getString(column_index);
+			}
+		} catch(Exception e) {
+			return null;
+		} finally {
+			if (cursor != null) {
+				cursor.close();
+			}
+		}
+		return null;
+	}
+
+
+	/**
+	 * @param uri The Uri to check.
+	 * @return Whether the Uri authority is ExternalStorageProvider.
+	 */
+	public static boolean isExternalStorageDocument(Uri uri) {
+		return "com.android.externalstorage.documents".equals(uri.getAuthority());
+	}
+
+	/**
+	 * @param uri The Uri to check.
+	 * @return Whether the Uri authority is DownloadsProvider.
+	 */
+	public static boolean isDownloadsDocument(Uri uri) {
+		return "com.android.providers.downloads.documents".equals(uri.getAuthority());
+	}
+
+	/**
+	 * @param uri The Uri to check.
+	 * @return Whether the Uri authority is MediaProvider.
+	 */
+	public static boolean isMediaDocument(Uri uri) {
+		return "com.android.providers.media.documents".equals(uri.getAuthority());
+	}
+
+	/**
+	 * @param filename The filename to extract extension from
+	 * @return last extension or empty string
+	 */
+	public static String getLastExtension(final String filename) {
+		if (filename == null || filename.isEmpty()) {
+			return "";
+		}
+		final int lastDotPosition = filename.lastIndexOf('.');
+		final String lastPart = lastDotPosition != -1 ?
+				filename.substring(lastDotPosition + 1) : "";
+		return lastPart;
+	}
+
+	/**
+	 * @param filename The filename to extract extension from
+	 * @return second to last extension or empty string
+	 */
+	public static String getSecondToLastExtension(final String filename) {
+		if (filename == null || filename.isEmpty()) {
+			return "";
+		}
+		final int lastDotPosition = filename.lastIndexOf('.');
+		final int secondToLastDotPosition = filename.lastIndexOf('.', lastDotPosition - 1);
+		final String secondToLastPart = secondToLastDotPosition != -1 ?
+				filename.substring(secondToLastDotPosition + 1, lastDotPosition) : "";
+		return secondToLastPart;
+	}
+
+	private FileUtils() {
+		// Utility class - do not instantiate
+	}
+}