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Merge pull request #222 from humhub/46-internal-links-to-humhub-files…
…-are-not-clickable Implement download functionality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| import 'dart:convert'; | ||
| import 'dart:io'; | ||
|
|
||
| import 'package:flutter_inappwebview/flutter_inappwebview.dart'; | ||
| import 'package:package_info_plus/package_info_plus.dart'; | ||
| import 'package:path_provider/path_provider.dart'; | ||
|
|
||
| class FileHandler { | ||
| final InAppWebViewController controller; | ||
| final DownloadStartRequest downloadStartRequest; | ||
| final String? filename; | ||
| final Function(Exception ex)? onError; | ||
| final Function(File file, String filename) onSuccess; | ||
| static const String _jsCode = """ | ||
| function downloadFile(url) { | ||
| fetch(url, { | ||
| headers: { | ||
| // Include necessary headers for authentication if needed | ||
| 'Authorization': 'Bearer <your_token>' | ||
| } | ||
| }) | ||
| .then(response => response.blob()) | ||
| .then(blob => { | ||
| const reader = new FileReader(); | ||
| reader.readAsDataURL(blob); | ||
| reader.onloadend = function() { | ||
| const base64data = reader.result; | ||
| // Send the base64 content to Flutter | ||
| window.flutter_inappwebview.callHandler('downloadFile', base64data); | ||
| } | ||
| }) | ||
| .catch(error => console.error('Error downloading file:', error)); | ||
| } | ||
| """; | ||
|
|
||
| const FileHandler({ | ||
| required this.controller, | ||
| required this.downloadStartRequest, | ||
| required this.onSuccess, | ||
| this.filename, | ||
| this.onError, | ||
|
|
||
| }); | ||
|
|
||
| download() async { | ||
| try { | ||
| await controller.evaluateJavascript(source: _jsCode); | ||
| await controller.evaluateJavascript(source: "downloadFile('${downloadStartRequest.url.toString()}');"); | ||
| controller.addJavaScriptHandler( | ||
| handlerName: 'downloadFile', | ||
| callback: (args) async { | ||
| String base64Data = args[0]; | ||
| var (file, filename) = await _saveFile(base64Data); | ||
| onSuccess(file, filename); | ||
| }); | ||
| } catch (er) { | ||
| if (er is Exception && onError != null) { | ||
| onError!(er); | ||
| } | ||
| //rethrow; | ||
| } | ||
| } | ||
|
|
||
| Future<(File file, String filename)> _saveFile(String base64Data) async { | ||
| // Decode base64 string to binary data | ||
| final decodedBytes = base64Decode(base64Data.split(",").last); // In case there's a base64 header | ||
|
|
||
| // Get the directory for storing files | ||
| Directory? directory = await _getDownloadDirectory(); | ||
| if (directory == null) throw Exception("no_download_folder_found"); | ||
| // Set a default filename if not provided | ||
| String endFilename = filename ?? downloadStartRequest.suggestedFilename ?? await _generateFilename(); | ||
|
|
||
| // Generate a unique file path | ||
| String filePath = await _generateUniqueFilePath(directory, endFilename); | ||
|
|
||
| // Write the decoded data to the file | ||
| File file = File(filePath); | ||
| await file.writeAsBytes(decodedBytes); | ||
| if (!await file.exists()) throw Exception("file_was_not_created"); | ||
| return (file, endFilename); | ||
| } | ||
|
|
||
| Future<String> _generateFilename() async { | ||
| PackageInfo packageInfo = await PackageInfo.fromPlatform(); | ||
| String appName = packageInfo.appName; | ||
| String filename = '${appName}file'; | ||
|
|
||
| // Replace spaces with underscores | ||
| filename = filename.replaceAll(' ', '_'); | ||
|
|
||
| return filename; | ||
| } | ||
|
|
||
| Future<String> _generateUniqueFilePath(Directory directory, String baseFilename) async { | ||
| String filePath = '${directory.path}/$baseFilename'; | ||
| int counter = 1; | ||
|
|
||
| while (File(filePath).existsSync()) { | ||
| // Append a number in parentheses to the baseFilename | ||
| String newFilename = '($counter)$baseFilename'; | ||
| filePath = '${directory.path}/$newFilename'; | ||
| counter++; | ||
| } | ||
|
|
||
| return filePath; | ||
| } | ||
|
|
||
| Future<Directory?> _getDownloadDirectory() async { | ||
| Directory? directory; | ||
|
|
||
| if (Platform.isIOS) { | ||
| directory = await getApplicationDocumentsDirectory(); | ||
| } else { | ||
| String check = "/storage/emulated/0/Download/"; | ||
|
|
||
| bool dirDownloadExists = await Directory(check).exists(); | ||
| if (dirDownloadExists) { | ||
| directory = Directory(check); | ||
| } else { | ||
| directory = await getExternalStorageDirectory(); | ||
| } | ||
| } | ||
|
|
||
| return directory; | ||
| } | ||
| } |
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