From 3fbcf5d076f1ade04c20cde7eefd299857ae37aa Mon Sep 17 00:00:00 2001
From: Kiril Tijsma <kiril@live.nl>
Date: Mon, 10 Mar 2025 11:26:01 +0100
Subject: [PATCH] feat(chat-service/pending-messages): add pending images

---
 .../lib/src/extension/uint8list_data_uri.dart | 25 +++++++++++++++++++
 .../lib/src/local/local_chat_repository.dart  |  3 ++-
 .../lib/src/services/chat_service.dart        |  4 ++-
 .../chat_repository_interface/pubspec.yaml    |  1 +
 .../lib/src/config/chat_options.dart          |  5 +++-
 packages/flutter_chat/lib/src/routes.dart     |  1 +
 6 files changed, 36 insertions(+), 3 deletions(-)
 create mode 100644 packages/chat_repository_interface/lib/src/extension/uint8list_data_uri.dart

diff --git a/packages/chat_repository_interface/lib/src/extension/uint8list_data_uri.dart b/packages/chat_repository_interface/lib/src/extension/uint8list_data_uri.dart
new file mode 100644
index 0000000..940fe84
--- /dev/null
+++ b/packages/chat_repository_interface/lib/src/extension/uint8list_data_uri.dart
@@ -0,0 +1,25 @@
+import "dart:convert";
+import "dart:typed_data";
+import "package:mime/mime.dart";
+
+/// Error thrown when there is no
+/// mimetype found
+class MimetypeMissingError extends Error {
+  @override
+  String toString() => "You can only provide files that contain a mimetype";
+}
+
+/// Extension that provides a converter function from
+/// Uin8List to a base64Encoded data uri.
+extension ToDataUri on Uint8List {
+  /// This function converts the Uint8List into
+  /// a uri with a data-scheme.
+  String toDataUri() {
+    var mimeType = lookupMimeType("", headerBytes: this);
+    if (mimeType == null) throw MimetypeMissingError();
+
+    var base64Data = base64Encode(this);
+
+    return "data:$mimeType;base64,$base64Data";
+  }
+}
diff --git a/packages/chat_repository_interface/lib/src/local/local_chat_repository.dart b/packages/chat_repository_interface/lib/src/local/local_chat_repository.dart
index 6defe58..a0f45e7 100644
--- a/packages/chat_repository_interface/lib/src/local/local_chat_repository.dart
+++ b/packages/chat_repository_interface/lib/src/local/local_chat_repository.dart
@@ -3,6 +3,7 @@ import "dart:math" as math;
 import "dart:typed_data";
 
 import "package:chat_repository_interface/chat_repository_interface.dart";
+import "package:chat_repository_interface/src/extension/uint8list_data_uri.dart";
 import "package:chat_repository_interface/src/local/local_memory_db.dart";
 import "package:collection/collection.dart";
 import "package:rxdart/rxdart.dart";
@@ -272,7 +273,7 @@ class LocalChatRepository implements ChatRepositoryInterface {
     required String chatId,
     required String senderId,
   }) =>
-      Future.value("https://picsum.photos/200/300");
+      Future.value(image.toDataUri());
 
   /// All the chats of the local memory database
   List<ChatModel> get getLocalChats => chats;
diff --git a/packages/chat_repository_interface/lib/src/services/chat_service.dart b/packages/chat_repository_interface/lib/src/services/chat_service.dart
index 0ff32db..6d5d8ea 100644
--- a/packages/chat_repository_interface/lib/src/services/chat_service.dart
+++ b/packages/chat_repository_interface/lib/src/services/chat_service.dart
@@ -1,6 +1,7 @@
 import "dart:async";
 import "dart:typed_data";
 
+import "package:chat_repository_interface/src/extension/uint8list_data_uri.dart";
 import "package:chat_repository_interface/src/interfaces/chat_repostory_interface.dart";
 import "package:chat_repository_interface/src/interfaces/pending_message_repository_interface.dart";
 import "package:chat_repository_interface/src/interfaces/user_repository_interface.dart";
@@ -203,6 +204,7 @@ class ChatService {
     String? text,
     String? messageType,
     String? imageUrl,
+    Uint8List? imageData,
   }) async {
     await pendingMessageRepository.createMessage(
       chatId: chatId,
@@ -210,7 +212,7 @@ class ChatService {
       messageId: messageId,
       text: text,
       messageType: messageType,
-      imageUrl: imageUrl,
+      imageUrl: imageData?.toDataUri() ?? imageUrl,
     );
 
     unawaited(
diff --git a/packages/chat_repository_interface/pubspec.yaml b/packages/chat_repository_interface/pubspec.yaml
index 482ab27..c4aa64a 100644
--- a/packages/chat_repository_interface/pubspec.yaml
+++ b/packages/chat_repository_interface/pubspec.yaml
@@ -9,6 +9,7 @@ environment:
   sdk: ">=3.4.3 <4.0.0"
 
 dependencies:
+  mime: any
   rxdart: any
   collection: any
 
diff --git a/packages/flutter_chat/lib/src/config/chat_options.dart b/packages/flutter_chat/lib/src/config/chat_options.dart
index 4ee7526..2799d7a 100644
--- a/packages/flutter_chat/lib/src/config/chat_options.dart
+++ b/packages/flutter_chat/lib/src/config/chat_options.dart
@@ -284,7 +284,10 @@ ImageProvider _defaultImageProviderResolver(
   BuildContext context,
   Uri image,
 ) =>
-    CachedNetworkImageProvider(image.toString());
+    switch (image.scheme) {
+      "data" => MemoryImage(image.data!.contentAsBytes()),
+      _ => CachedNetworkImageProvider(image.toString()),
+    };
 
 /// All configurable paddings and whitespaces within the userstory
 class ChatSpacing {
diff --git a/packages/flutter_chat/lib/src/routes.dart b/packages/flutter_chat/lib/src/routes.dart
index 952fc81..8682754 100644
--- a/packages/flutter_chat/lib/src/routes.dart
+++ b/packages/flutter_chat/lib/src/routes.dart
@@ -61,6 +61,7 @@ MaterialPageRoute chatDetailRoute({
             chatId: chatId,
             senderId: userId,
             imageUrl: path,
+            imageData: data,
           );
         },
         onMessageSubmit: (text) async {