Add share document feature

lib/data/web_client.dart

@@ -13,7 +13,11 @@ import 'package:version/version.dart';
 class WebClient {
   const WebClient();
 
-  Future<dynamic> get(String url, String token) async {
+  Future<dynamic> get(
+    String url,
+    String token, {
+    bool rawResponse = false,
+  }) async {
     if (Config.DEMO_MODE) {
       throw 'Server requests are not supported in the demo';
     }
@@ -34,6 +38,10 @@ class WebClient {
       headers: _getHeaders(url, token),
     );
 
+    if (rawResponse) {
+      return response;
+    }
+
     _checkResponse(response);
 
     final dynamic jsonResponse = json.decode(response.body);

lib/ui/app/document_grid.dart

@@ -1,18 +1,24 @@
+import 'dart:io';
+
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_redux/flutter_redux.dart';
+import 'package:flutter_share/flutter_share.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:invoiceninja_flutter/data/models/models.dart';
+import 'package:invoiceninja_flutter/data/web_client.dart';
 import 'package:invoiceninja_flutter/redux/app/app_state.dart';
 import 'package:invoiceninja_flutter/ui/app/buttons/elevated_button.dart';
 import 'package:invoiceninja_flutter/ui/app/lists/list_divider.dart';
 import 'package:invoiceninja_flutter/utils/dialogs.dart';
 import 'package:invoiceninja_flutter/utils/formatting.dart';
 import 'package:invoiceninja_flutter/utils/icons.dart';
+import 'package:http/http.dart' as http;
 import 'package:invoiceninja_flutter/utils/localization.dart';
 import 'package:invoiceninja_flutter/utils/web_stub.dart'
     if (dart.library.html) 'package:invoiceninja_flutter/utils/web.dart';
+import 'package:path_provider/path_provider.dart';
 
 class DocumentGrid extends StatelessWidget {
   const DocumentGrid({
@@ -163,6 +169,32 @@ class DocumentTile extends StatelessWidget {
                             });
                       },
                     ),
+              FlatButton(
+                child: Text(localization.download.toUpperCase()),
+                onPressed: () async {
+                  Directory directory;
+                  if (Platform.isAndroid) {
+                    directory = await getExternalStorageDirectory();
+                  } else {
+                    directory = await getApplicationDocumentsDirectory();
+                  }
+
+                  final String folder = '${directory.path}/documents';
+                  await Directory(folder).create(recursive: true);
+                  final filePath = '$folder/${document.name}';
+                  final store = StoreProvider.of<AppState>(context);
+
+                  final http.Response response = await WebClient().get(
+                      document.url, store.state.credentials.token,
+                      rawResponse: true);
+
+                  await File(filePath).writeAsBytes(response.bodyBytes);
+                  await FlutterShare.shareFile(
+                    title: '${localization.name}',
+                    filePath: filePath,
+                  );
+                },
+              ),
               FlatButton(
                 child: Text(localization.close.toUpperCase()),
                 onPressed: () {