Show message files

lib/helpers/conversation_files_helper.dart

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+import 'dart:io';
+
+import 'package:comunic/models/conversation_message.dart';
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+
+/// Conversation files helper
+///
+/// @author Pierre Hubert
+
+class ConversationFilesHelper {
+  /// Get the path for chat file
+  static Future<File> getPathForChatFile(
+      int msgID, ConversationMessageFile fileInfo) async {
+    Directory basePath = await getTemporaryDirectory();
+
+    final storageDir = path.join(basePath.absolute.path, "conversation-files");
+    final fileName = "$msgID";
+
+    return File(path.join(storageDir, fileName));
+  }
+
+  /// Download chat file
+  static Future<void> download({
+    @required int msgID,
+    @required ConversationMessageFile fileInfo,
+    @required Function(double) onProgress,
+    @required CancelToken cancelToken,
+  }) async {
+    final target = await getPathForChatFile(msgID, fileInfo);
+
+    // Create parent directory if required
+    if (!await target.parent.exists()) {
+      await target.parent.create(recursive: true);
+    }
+
+    await Dio().download(
+      fileInfo.url,
+      target.path,
+      cancelToken: cancelToken,
+      onReceiveProgress: (p, t) => onProgress(p / fileInfo.size.toDouble()),
+    );
+  }
+}