protect

Description:

protect

protect #























Protect is a flutter and dart library for applying and removing password protection on excel files.
Table of Contents #

Installing
Usage

Imports
Read xlsx file
Read xlsx file from Asset Folder
Apply password on xlsx file
Remove password on xlsx file
Saving xlsx file
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Lets Get Started #
1. Depend on it #
Add this to your package's pubspec.yaml file:
dependencies:
protect: ^1.0.0
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2. Install it #
You can install packages from the command line:
with pub:
$ pub get
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with Flutter:
$ flutter packages get
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3. Import it #
Now in your Dart code, you can use:
import 'package:protect/protect.dart';
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Usage #
Imports #
import 'dart:io';
import 'package:protect/protect.dart';

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Read XLSX File #
var file = "Path_to_pre_existing_Excel_File/excel_file.xlsx";
var unprotectedExcelBytes = await File(file).readAsBytes();
or
//var protectedExcelBytes = await File(file).readAsBytes();

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Read XLSX from Flutter's Asset Folder #
import 'package:flutter/services.dart' show ByteData, rootBundle;

/* Your blah blah code here */

ByteData data = await rootBundle.load("assets/existing_excel_file.xlsx");
var bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
var unprotectedExcelBytes = await File(file).readAsBytes();
or
//var protectedExcelBytes = await File(file).readAsBytes();

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Apply password protection on XLSX File #
///
/// Applying password protection
/// where `unprotectedExcelBytes` is the bytes of unprotected excel
///
ProtectResponse encryptedResponse = await Protect.encryptUint8List(unprotectedUint8List, '[email protected]');

var data;
if (encryptedResponse.isDataValid) {
data = encryptedResponse.processedBytes;
} else {
print('Excel file used for applying password over it is corrupted');
}

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Remove password protection on XLSX File #
///
/// Applying password protection
/// where `protectedUint8List` is the bytes of encrypted excel
///
ProtectResponse decryptedResponse = await Protect.decryptUint8List(protectedUint8List, '[email protected]');

var data;
if (decryptedResponse.isDataValid) {
data = decryptedResponse.processedBytes;
} else {
print('Either password is wrong for opening the excel file or the Excel file is corrupted');
}
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Saving XLSX File #
// Save the Changes in file

var outputPath = '/Path_to_excel_folder/form_encrypted_file.xlsx';
await File(outputPath)
..create(recursive: true)
..writeAsBytes(data);

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