Extend the possibilities of file picker

lib/helpers/server_config_helper.dart

@@ -70,3 +70,6 @@ class ServerConfigurationHelper {
     return _config;
   }
 }
+
+/// Shortcut for server configuration
+ServerConfig get srvConfig => ServerConfigurationHelper.config;

lib/ui/dialogs/pick_file_dialog.dart

@@ -0,0 +1,161 @@
+import 'package:comunic/models/api_request.dart';
+import 'package:comunic/utils/files_utils.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:filesize/filesize.dart';
+import 'package:flutter/material.dart';
+import 'package:image_picker/image_picker.dart';
+import 'package:mime/mime.dart';
+
+/// Pick file dialog
+///
+/// @author Pierre Hubert
+
+enum _FileChoices {
+  PICK_IMAGE,
+  TAKE_PICTURE,
+  PICK_OTHER_FILE,
+}
+
+typedef _CanEnable = bool Function(List<String>);
+typedef _OnOptionSelected = void Function(_FileChoices);
+
+class _PickFileOption {
+  final _FileChoices value;
+  final String label;
+  final IconData icon;
+  final _CanEnable canEnable;
+
+  const _PickFileOption({
+    @required this.value,
+    @required this.label,
+    @required this.icon,
+    @required this.canEnable,
+  })  : assert(value != null),
+        assert(label != null),
+        assert(icon != null),
+        assert(canEnable != null);
+}
+
+List<_PickFileOption> get _optionsList => [
+      // Image
+      _PickFileOption(
+          value: _FileChoices.PICK_IMAGE,
+          label: tr("Choose an image"),
+          icon: Icons.image_search,
+          canEnable: (l) => l.any(isImage)),
+      _PickFileOption(
+          value: _FileChoices.TAKE_PICTURE,
+          label: tr("Take a picture"),
+          icon: Icons.camera_alt,
+          canEnable: (l) => l.any(isImage)),
+      _PickFileOption(
+          value: _FileChoices.PICK_OTHER_FILE,
+          label: tr("Browse files"),
+          icon: Icons.folder_open,
+          canEnable: (l) => l.any((el) => !isImage(el))),
+    ];
+
+Future<BytesFile> showPickFileDialog({
+  @required BuildContext context,
+  int maxFileSize,
+  List<String> allowedMimeTypes,
+  double imageMaxWidth,
+  double imageMaxHeight,
+}) async {
+  assert(allowedMimeTypes != null);
+
+  // Get the list of allowed extension
+  final allowedExtensions = List<String>();
+  for (var mime in allowedExtensions) {
+    final ext = extensionFromMime(mime);
+    if (ext != mime) allowedExtensions.add(ext);
+  }
+
+  // Display bottom sheet
+  final choice = await showModalBottomSheet(
+      context: context,
+      builder: (c) => BottomSheet(
+            onClosing: () {},
+            builder: (c) => _BottomSheetPickOption(
+              options: _optionsList
+                  .where((element) => element.canEnable(allowedMimeTypes))
+                  .toList(),
+              onOptionSelected: (v) => Navigator.pop(c, v),
+            ),
+          ));
+
+  if (choice == null) return null;
+
+  BytesFile file;
+  switch (choice) {
+    // Pick an image
+    case _FileChoices.PICK_IMAGE:
+    case _FileChoices.TAKE_PICTURE:
+      final image = await ImagePicker().getImage(
+        source: choice == _FileChoices.PICK_IMAGE
+            ? ImageSource.gallery
+            : ImageSource.camera,
+        maxWidth: imageMaxWidth,
+        maxHeight: imageMaxHeight,
+      );
+
+      if (image == null) return null;
+
+      file = BytesFile(image.path.split("/").last, await image.readAsBytes());
+
+      break;
+
+    // Pick other files
+    case _FileChoices.PICK_OTHER_FILE:
+      final pickedFile = await FilePicker.platform.pickFiles(
+        type: FileType.any,
+        allowedExtensions: allowedExtensions,
+        allowMultiple: false,
+        withData: true,
+      );
+
+      if (pickedFile == null || pickedFile.files.length == 0) return null;
+
+      file = BytesFile(pickedFile.files[0].name, pickedFile.files[0].bytes);
+      break;
+  }
+
+  if (file == null) return null;
+
+  // Check file size
+  if (file.bytes.length > maxFileSize) {
+    showSimpleSnack(
+        context,
+        tr("This file could not be sent: it is too big! (Max allowed size: %1%)",
+            args: {"1": filesize(file.bytes.length)}));
+    return null;
+  }
+
+  return file;
+}
+
+class _BottomSheetPickOption extends StatelessWidget {
+  final List<_PickFileOption> options;
+  final _OnOptionSelected onOptionSelected;
+
+  const _BottomSheetPickOption(
+      {Key key, @required this.options, @required this.onOptionSelected})
+      : assert(options != null),
+        assert(onOptionSelected != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) => Container(
+        height: 300,
+        child: ListView.builder(
+          itemCount: options.length,
+          itemBuilder: (c, i) => ListTile(
+            leading: Icon(options[i].icon),
+            title: Text(options[i].label),
+            onTap: () => onOptionSelected(options[i].value),
+          ),
+        ),
+      );
+}

lib/ui/screens/conversation_screen.dart

@@ -6,16 +6,15 @@ import 'package:comunic/helpers/server_config_helper.dart';
 import 'package:comunic/helpers/users_helper.dart';
 import 'package:comunic/lists/conversation_messages_list.dart';
 import 'package:comunic/lists/users_list.dart';
-import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/conversation.dart';
 import 'package:comunic/models/conversation_message.dart';
 import 'package:comunic/models/new_conversation_message.dart';
+import 'package:comunic/ui/dialogs/pick_file_dialog.dart';
 import 'package:comunic/ui/routes/main_route/main_route.dart';
 import 'package:comunic/ui/tiles/conversation_message_tile.dart';
 import 'package:comunic/ui/tiles/server_conversation_message_tile.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
 import 'package:comunic/ui/widgets/scroll_watcher.dart';
-import 'package:comunic/utils/files_utils.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:comunic/utils/list_utils.dart';
 import 'package:comunic/utils/log_utils.dart';
@@ -221,49 +220,42 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
     _setError(ErrorLevel.NONE);
   }
 
-  /// Pick and send an image
-  Future<void> _sendImage(BuildContext context) async {
+  /// Send a file message
+  Future<void> _sendFileMessage() async {
     try {
-      final image = await pickImage(context);
+      final file = await showPickFileDialog(
+        context: context,
+        maxFileSize: srvConfig.conversationsPolicy.filesMaxSize,
+        allowedMimeTypes: srvConfig.conversationsPolicy.allowedFilesType,
+      );
 
-      if (image == null) return;
+      if (file == null) return;
 
-      await _sendFileMessage(BytesFile(
-        image.path.split("/").last,
-        await image.readAsBytes(),
-      ));
+      await _submitMessage(
+        NewConversationMessage(
+          conversationID: widget.conversationID,
+          message: null,
+          file: file,
+        ),
+      );
     } catch (e, s) {
       logError(e, s);
-      showSimpleSnack(context, tr("Failed to send image!"));
+      showSimpleSnack(context, tr("Failed to send a file!"));
     }
   }
 
-  /// Send a file message
-  Future<void> _sendFileMessage(BytesFile file) async {
-    await _submitMessage(
-      context,
-      NewConversationMessage(
-        conversationID: widget.conversationID,
-        message: null,
-        file: file,
-      ),
-    );
-  }
-
   /// Send a new text message
-  Future<void> _submitTextMessage(BuildContext context, String content) async {
-    if (await _submitMessage(
-            context,
-            NewConversationMessage(
-              conversationID: widget.conversationID,
-              message: content,
-            )) ==
+  Future<void> _submitTextMessage() async {
+    if (await _submitMessage(NewConversationMessage(
+          conversationID: widget.conversationID,
+          message: textMessage,
+        )) ==
         SendMessageResult.SUCCESS) _clearSendMessageForm();
   }
 
   /// Submit a new message
   Future<SendMessageResult> _submitMessage(
-      BuildContext context, NewConversationMessage message) async {
+      NewConversationMessage message) async {
     //Send the message
     _setSending(true);
     final result = await _conversationsHelper.sendMessage(message);
@@ -368,7 +360,7 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
                     ? Theme.of(context).disabledColor
                     : Theme.of(context).accentColor,
               ),
-              onPressed: () => _sendImage(context),
+              onPressed: () => _sendFileMessage(),
             ),
           ),
 
@@ -387,9 +379,7 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
               enabled: !_isSendingMessage,
               controller: _textEditingController,
               onChanged: (s) => setState(() {}),
-              onSubmitted: _isMessageValid
-                  ? (s) => _submitTextMessage(context, s)
-                  : null,
+              onSubmitted: _isMessageValid ? (s) => _submitTextMessage() : null,
               decoration: new InputDecoration.collapsed(
                 hintText: tr("Send a message"),
               ),
@@ -407,8 +397,7 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
                     : Theme.of(context).disabledColor,
               ),
               onPressed: !_isSendingMessage && _isMessageValid
-                  ? () =>
-                      _submitTextMessage(context, _textEditingController.text)
+                  ? () => _submitTextMessage()
                   : null,
             ),
           ),

lib/utils/files_utils.dart

@@ -45,3 +45,6 @@ Future<PickedFile> pickImage(BuildContext context) async {
           ? ImageSource.camera
           : ImageSource.gallery);
 }
+
+/// Check if a mime type maps to an image or not
+bool isImage(String mimeType) => mimeType.startsWith("image/");

pubspec.lock

@@ -191,7 +191,7 @@ packages:
     source: hosted
     version: "0.1.6"
   file_picker:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: file_picker
       url: "https://pub.dartlang.org"
@@ -346,7 +346,7 @@ packages:
     source: hosted
     version: "1.3.0-nullsafety.3"
   mime:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: mime
       url: "https://pub.dartlang.org"

pubspec.yaml

@@ -83,6 +83,7 @@ dependencies:
   wakelock: ^0.2.1+1
 
   # Pick any kind of file
+  file_picker: ^2.1.6
   file_picker_cross: ^4.2.8
 
   # Get information about current version
@@ -105,6 +106,9 @@ dependencies:
   chewie_audio: ^1.1.2
   chewie: ^0.12.2
 
+  # Determine file mime type
+  mime: ^0.9.7
+
 dev_dependencies:
   flutter_test:
     sdk: flutter