FileUtils.java

package com.example.adhocdisplay;

/*
 * Copyright (C) 2018 OpenIntents.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.content.FileProvider;
import android.util.Log;
import android.webkit.MimeTypeMap;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.Comparator;

import okhttp3.ResponseBody;

public class FileUtils {
    public static final String DOCUMENTS_DIR = "documents";
    // configured android:authorities in AndroidManifest (https://developer.android.com/reference/android/support/v4/content/FileProvider)
    public static final String AUTHORITY =  "YOUR_AUTHORITY.provider";
    public static final String HIDDEN_PREFIX = ".";
    /**
     * TAG for log messages.
     */
    static final String TAG = "FileUtils";
    private static final boolean DEBUG = false; // Set to true to enable logging
    /**
     * File and folder comparator. TODO Expose sorting option method
     */
    public static Comparator<File> sComparator = (f1, f2) -> {
        // Sort alphabetically by lower case, which is much cleaner
        return f1.getName().toLowerCase().compareTo(
                f2.getName().toLowerCase());
    };
    /**
     * File (not directories) filter.
     */
    public static FileFilter sFileFilter = file -> {
        final String fileName = file.getName();
        // Return files only (not directories) and skip hidden files
        return file.isFile() && !fileName.startsWith(HIDDEN_PREFIX);
    };
    /**
     * Folder (directories) filter.
     */
    public static FileFilter sDirFilter = file -> {
        final String fileName = file.getName();
        // Return directories only and skip hidden directories
        return file.isDirectory() && !fileName.startsWith(HIDDEN_PREFIX);
    };

    private FileUtils() {
    } //private constructor to enforce Singleton pattern

    /**
     * Gets the extension of a file name, like ".png" or ".jpg".
     *
     * @param uri
     * @return Extension including the dot("."); "" if there is no extension;
     * null if uri was null.
     */
    public static String getExtension(String uri) {
        if (uri == null) {
            return null;
        }

        int dot = uri.lastIndexOf(".");
        if (dot >= 0) {
            return uri.substring(dot);
        } else {
            // No extension.
            return "";
        }
    }

    /**
     * @return Whether the URI is a local one.
     */
    public static boolean isLocal(String url) {
        return url != null && !url.startsWith("http://") && !url.startsWith("https://");
    }

    /**
     * @return True if Uri is a MediaStore Uri.
     * @author paulburke
     */
    public static boolean isMediaUri(Uri uri) {
        return "media".equalsIgnoreCase(uri.getAuthority());
    }

    /**
     * Convert File into Uri.
     *
     * @param file
     * @return uri
     */
    public static Uri getUri(File file) {
        return (file != null) ? Uri.fromFile(file) : null;
    }

    /**
     * Returns the path only (without file name).
     *
     * @param file
     * @return
     */
    public static File getPathWithoutFilename(File file) {
        if (file != null) {
            if (file.isDirectory()) {
                // no file to be split off. Return everything
                return file;
            } else {
                String filename = file.getName();
                String filepath = file.getAbsolutePath();

                // Construct path without file name.
                String pathwithoutname = filepath.substring(0,
                        filepath.length() - filename.length());
                if (pathwithoutname.endsWith("/")) {
                    pathwithoutname = pathwithoutname.substring(0, pathwithoutname.length() - 1);
                }
                return new File(pathwithoutname);
            }
        }
        return null;
    }

    /**
     * @return The MIME type for the given file.
     */
    public static String getMimeType(File file) {

        String extension = getExtension(file.getName());

        if (extension.length() > 0)
            return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension.substring(1));

        return "application/octet-stream";
    }

    /**
     * @return The MIME type for the give Uri.
     */
    public static String getMimeType(Context context, Uri uri) {
        File file = new File(getPath(context, uri));
        return getMimeType(file);
    }

      /**
     * @return The MIME type for the give String Uri.
     */
    public static String getMimeType(Context context, String url) {
        String type = context.getContentResolver().getType(Uri.parse(url));
        if (type == null) {
            type = "application/octet-stream";
        }
        return type;
    }
    
    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is local.
     */
    public static boolean isLocalStorageDocument(Uri uri) {
        return AUTHORITY.equals(uri.getAuthority());
    }

    /**
     * @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 uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }

    /**
     * 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.
     */
    public static String getDataColumn(Context context, Uri uri, String selection,
                                       String[] selectionArgs) {

        Cursor cursor = null;
        final String column = MediaStore.Files.FileColumns.DATA;
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                if (DEBUG)
                    DatabaseUtils.dumpCursor(cursor);

                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        }  catch (Exception e) {
            Timber.e(e);
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

     /**
     * 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.<br>
     * <br>
     * Callers should check whether the path is local before assuming it
     * represents a local file.
     *
     * @param context The context.
     * @param uri     The Uri to query.
     * @see #isLocal(String)
     * @see #getFile(Context, Uri)
     */
    public static String getPath(final Context context, final Uri uri) {
        String absolutePath = getLocalPath(context, uri);
        return absolutePath != null ? absolutePath : uri.toString();
    }
    
    private static String getLocalPath(final Context context, final Uri uri) {

        if (DEBUG)
            Log.d(TAG + " File -",
                    "Authority: " + uri.getAuthority() +
                            ", Fragment: " + uri.getFragment() +
                            ", Port: " + uri.getPort() +
                            ", Query: " + uri.getQuery() +
                            ", Scheme: " + uri.getScheme() +
                            ", Host: " + uri.getHost() +
                            ", Segments: " + uri.getPathSegments().toString()
            );

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // LocalStorageProvider
            if (isLocalStorageDocument(uri)) {
                // The path is the id
                return DocumentsContract.getDocumentId(uri);
            }
            // ExternalStorageProvider
            else 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];
                } else if ("home".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/documents/" + split[1];
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);

                if (id != null && id.startsWith("raw:")) {
                    return id.substring(4);
                }

                String[] contentUriPrefixesToTry = new String[]{
                        "content://downloads/public_downloads",
                        "content://downloads/my_downloads"
                };

                for (String contentUriPrefix : contentUriPrefixesToTry) {
                    Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id));
                    try {
                        String path = getDataColumn(context, contentUri, null, null);
                        if (path != null) {
                            return path;
                        }
                    } catch (Exception e) {}
                }

                // path could not be retrieved using ContentResolver, therefore copy file to accessible cache using streams
                String fileName = getFileName(context, uri);
                File cacheDir = getDocumentCacheDir(context);
                File file = generateFileName(fileName, cacheDir);
                String destinationPath = null;
                if (file != null) {
                    destinationPath = file.getAbsolutePath();
                    saveFileFromUri(context, uri, destinationPath);
                }

                return destinationPath;
            }
            // 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 ("content".equalsIgnoreCase(uri.getScheme())) {

            // Return the remote address
            if (isGooglePhotosUri(uri)) {
                return uri.getLastPathSegment();
            }

            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }

    /**
     * Convert Uri into File, if possible.
     *
     * @return file A local file that the Uri was pointing to, or null if the
     * Uri is unsupported or pointed to a remote resource.
     * @author paulburke
     * @see #getPath(Context, Uri)
     */
    public static File getFile(Context context, Uri uri) {
        if (uri != null) {
            String path = getPath(context, uri);
            if (path != null && isLocal(path)) {
                return new File(path);
            }
        }
        return null;
    }

    /**
     * Get the file size in a human-readable string.
     *
     * @param size
     * @return
     * @author paulburke
     */
    public static String getReadableFileSize(int size) {
        final int BYTES_IN_KILOBYTES = 1024;
        final DecimalFormat dec = new DecimalFormat("###.#");
        final String KILOBYTES = " KB";
        final String MEGABYTES = " MB";
        final String GIGABYTES = " GB";
        float fileSize = 0;
        String suffix = KILOBYTES;

        if (size > BYTES_IN_KILOBYTES) {
            fileSize = size / BYTES_IN_KILOBYTES;
            if (fileSize > BYTES_IN_KILOBYTES) {
                fileSize = fileSize / BYTES_IN_KILOBYTES;
                if (fileSize > BYTES_IN_KILOBYTES) {
                    fileSize = fileSize / BYTES_IN_KILOBYTES;
                    suffix = GIGABYTES;
                } else {
                    suffix = MEGABYTES;
                }
            }
        }
        return String.valueOf(dec.format(fileSize) + suffix);
    }

    /**
     * Get the Intent for selecting content to be used in an Intent Chooser.
     *
     * @return The intent for opening a file with Intent.createChooser()
     */
    public static Intent createGetContentIntent() {
        // Implicitly allow the user to select a particular kind of data
        final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        // The MIME data type filter
        intent.setType("*/*");
        // Only return URIs that can be opened with ContentResolver
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        return intent;
    }


    /**
     * Creates View intent for given file
     *
     * @param file
     * @return The intent for viewing file
     */
    public static Intent getViewIntent(Context context, File file) {
        //Uri uri = Uri.fromFile(file);
        Uri uri = FileProvider.getUriForFile(context, AUTHORITY, file);
        Intent intent = new Intent(Intent.ACTION_VIEW);
        String url = file.toString();
        if (url.contains(".doc") || url.contains(".docx")) {
            // Word document
            intent.setDataAndType(uri, "application/msword");
        } else if (url.contains(".pdf")) {
            // PDF file
            intent.setDataAndType(uri, "application/pdf");
        } else if (url.contains(".ppt") || url.contains(".pptx")) {
            // Powerpoint file
            intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
        } else if (url.contains(".xls") || url.contains(".xlsx")) {
            // Excel file
            intent.setDataAndType(uri, "application/vnd.ms-excel");
        } else if (url.contains(".zip") || url.contains(".rar")) {
            // WAV audio file
            intent.setDataAndType(uri, "application/x-wav");
        } else if (url.contains(".rtf")) {
            // RTF file
            intent.setDataAndType(uri, "application/rtf");
        } else if (url.contains(".wav") || url.contains(".mp3")) {
            // WAV audio file
            intent.setDataAndType(uri, "audio/x-wav");
        } else if (url.contains(".gif")) {
            // GIF file
            intent.setDataAndType(uri, "image/gif");
        } else if (url.contains(".jpg") || url.contains(".jpeg") || url.contains(".png")) {
            // JPG file
            intent.setDataAndType(uri, "image/jpeg");
        } else if (url.contains(".txt")) {
            // Text file
            intent.setDataAndType(uri, "text/plain");
        } else if (url.contains(".3gp") || url.contains(".mpg") || url.contains(".mpeg") ||
                url.contains(".mpe") || url.contains(".mp4") || url.contains(".avi")) {
            // Video files
            intent.setDataAndType(uri, "video/*");
        } else {
            intent.setDataAndType(uri, "*/*");
        }

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        return intent;
    }

    public static File getDownloadsDir() {
        return Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
    }

    public static File getDocumentCacheDir(@NonNull Context context) {
        File dir = new File(context.getCacheDir(), DOCUMENTS_DIR);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        logDir(context.getCacheDir());
        logDir(dir);

        return dir;
    }

    private static void logDir(File dir) {
        if(!DEBUG) return;
        Log.d(TAG, "Dir=" + dir);
        File[] files = dir.listFiles();
        for (File file : files) {
            Log.d(TAG, "File=" + file.getPath());
        }
    }

    @Nullable
    public static File generateFileName(@Nullable String name, File directory) {
        if (name == null) {
            return null;
        }

        File file = new File(directory, name);

        if (file.exists()) {
            String fileName = name;
            String extension = "";
            int dotIndex = name.lastIndexOf('.');
            if (dotIndex > 0) {
                fileName = name.substring(0, dotIndex);
                extension = name.substring(dotIndex);
            }

            int index = 0;

            while (file.exists()) {
                index++;
                name = fileName + '(' + index + ')' + extension;
                file = new File(directory, name);
            }
        }

        try {
            if (!file.createNewFile()) {
                return null;
            }
        } catch (IOException e) {
            Log.w(TAG, e);
            return null;
        }

        logDir(directory);

        return file;
    }

    /**
     * Writes response body to disk
     *
     * @param body ResponseBody
     * @param path file path
     * @return File
     */
    public static File writeResponseBodyToDisk(ResponseBody body, String path) {
        try {
            File target = new File(path);

            InputStream inputStream = null;
            OutputStream outputStream = null;

            try {
                byte[] fileReader = new byte[4096];

                inputStream = body.byteStream();
                outputStream = new FileOutputStream(target);

                while (true) {
                    int read = inputStream.read(fileReader);

                    if (read == -1) {
                        break;
                    }

                    outputStream.write(fileReader, 0, read);
                }

                outputStream.flush();

                return target;
            } catch (IOException e) {
                return null;
            } finally {
                if (inputStream != null) {
                    inputStream.close();
                }

                if (outputStream != null) {
                    outputStream.close();
                }
            }
        } catch (IOException e) {
            return null;
        }
    }

    private static void saveFileFromUri(Context context, Uri uri, String destinationPath) {
        InputStream is = null;
        BufferedOutputStream bos = null;
        try {
            is = context.getContentResolver().openInputStream(uri);
            bos = new BufferedOutputStream(new FileOutputStream(destinationPath, false));
            byte[] buf = new byte[1024];
            is.read(buf);
            do {
                bos.write(buf);
            } while (is.read(buf) != -1);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) is.close();
                if (bos != null) bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static byte[] readBytesFromFile(String filePath) {

        FileInputStream fileInputStream = null;
        byte[] bytesArray = null;

        try {

            File file = new File(filePath);
            bytesArray = new byte[(int) file.length()];

            //read file into bytes[]
            fileInputStream = new FileInputStream(file);
            fileInputStream.read(bytesArray);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }

        return bytesArray;

    }

    public static File createTempImageFile(Context context, String fileName) throws IOException {
        // Create an image file name
        File storageDir = new File(context.getCacheDir(), DOCUMENTS_DIR);
        return File.createTempFile(fileName, ".jpg", storageDir);
    }

    public static String getFileName(@NonNull Context context, Uri uri) {
        String mimeType = context.getContentResolver().getType(uri);
        String filename = null;

        if (mimeType == null && context != null) {
            String path = getPath(context, uri);
            if (path == null) {
                filename = getName(uri.toString());
            } else {
                File file = new File(path);
                filename = file.getName();
            }
        } else {
            Cursor returnCursor = context.getContentResolver().query(uri, null,
                    null, null, null);
            if (returnCursor != null) {
                int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
                returnCursor.moveToFirst();
                filename = returnCursor.getString(nameIndex);
                returnCursor.close();
            }
        }

        return filename;
    }

    public static String getName(String filename) {
        if (filename == null) {
            return null;
        }
        int index = filename.lastIndexOf('/');
        return filename.substring(index + 1);
    }
}