chore: support pasting image links that have no file extension (#7262)

* test: speed up copypasta tests

* chore: strip away markdown syntax if message is image only

* chore: paste image urls with no file extension

* test: add integration test

* test: group tests

* chore: apply code suggestions to 3 files

frontend/appflowy_flutter/lib/plugins/ai_chat/presentation/message/ai_message_action_bar.dart

@@ -13,6 +13,7 @@ import 'package:appflowy/plugins/ai_chat/application/chat_select_sources_cubit.d
 import 'package:appflowy/plugins/document/application/prelude.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/copy_and_paste/clipboard_service.dart';
 import 'package:appflowy/shared/markdown_to_document.dart';
+import 'package:appflowy/shared/patterns/common_patterns.dart';
 import 'package:appflowy/startup/startup.dart';
 import 'package:appflowy/util/theme_extension.dart';
 import 'package:appflowy/workspace/application/sidebar/space/space_bloc.dart';
@@ -170,7 +171,7 @@ class CopyButton extends StatelessWidget {
           );
           await getIt<ClipboardService>().setData(
             ClipboardServiceData(
-              plainText: textMessage.text,
+              plainText: _getTrimmedPlainText(textMessage.text),
               inAppJson: jsonEncode(document.toJson()),
             ),
           );
@@ -184,6 +185,16 @@ class CopyButton extends StatelessWidget {
       ),
     );
   }
+
+  String _getTrimmedPlainText(String plainText) {
+    // match and capture inner url as group
+    final matches = singleLineMarkdownImageRegex.allMatches(plainText);
+    if (matches.length != 1) {
+      return plainText;
+    }
+
+    return matches.first[1] ?? plainText;
+  }
 }
 
 class RegenerateButton extends StatelessWidget {

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/copy_and_paste/custom_paste_command.dart

@@ -8,12 +8,12 @@ import 'package:appflowy/plugins/document/presentation/editor_plugins/copy_and_p
 import 'package:appflowy/plugins/document/presentation/editor_plugins/copy_and_paste/paste_from_plain_text.dart';
 import 'package:appflowy/shared/clipboard_state.dart';
 import 'package:appflowy/startup/startup.dart';
-import 'package:appflowy/util/default_extensions.dart';
 import 'package:appflowy_backend/log.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:appflowy_editor_plugins/appflowy_editor_plugins.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:http/http.dart' as http;
 import 'package:string_validator/string_validator.dart';
 
 /// - support
@@ -154,17 +154,14 @@ Future<bool> _pasteAsLinkPreview(
   EditorState editorState,
   String? text,
 ) async {
-  // 1. the url should contains a protocol
-  // 2. the url should not be an image url
-  if (text == null ||
-      text.isImageUrl() ||
-      !isURL(text, {'require_protocol': true})) {
+  // the url should contain a protocol
+  if (text == null || !isURL(text, {'require_protocol': true})) {
     return false;
   }
 
   final selection = editorState.selection;
   // Apply the update only when the selection is collapsed
-  //  and at the start of the current line
+  // and at the start of the current line
   if (selection == null ||
       !selection.isCollapsed ||
       selection.startIndex != 0) {
@@ -173,44 +170,52 @@ Future<bool> _pasteAsLinkPreview(
 
   final node = editorState.getNodeAtPath(selection.start.path);
   // Apply the update only when the current node is a paragraph
-  //  and the paragraph is empty
+  // and the paragraph is empty
   if (node == null ||
       node.type != ParagraphBlockKeys.type ||
       node.delta?.toPlainText().isNotEmpty == true) {
     return false;
   }
 
-  // 1. insert the text with link format
-  // 2. convert it the link preview node
-  final textTransaction = editorState.transaction;
-  textTransaction.insertText(
-    node,
-    0,
-    text,
-    attributes: {AppFlowyRichTextKeys.href: text},
-  );
+  final bool isImageUrl;
+  try {
+    isImageUrl = await _isImageUrl(text);
+  } catch (e) {
+    Log.info('unable to get content header');
+    return false;
+  }
+
+  // insert the text with link format
+  final textTransaction = editorState.transaction
+    ..insertText(
+      node,
+      0,
+      text,
+      attributes: {AppFlowyRichTextKeys.href: text},
+    );
   await editorState.apply(
     textTransaction,
     skipHistoryDebounce: true,
   );
 
-  final linkPreviewTransaction = editorState.transaction;
-  final insertedNodes = [
-    linkPreviewNode(url: text),
+  // convert it to image or link preview node
+  final replacementInsertedNodes = [
+    isImageUrl ? imageNode(url: text) : linkPreviewNode(url: text),
     // if the next node is null, insert a empty paragraph node
     if (node.next == null) paragraphNode(),
   ];
-  linkPreviewTransaction.insertNodes(
-    selection.start.path,
-    insertedNodes,
-  );
-  linkPreviewTransaction.deleteNode(node);
-  linkPreviewTransaction.afterSelection = Selection.collapsed(
-    Position(
-      path: node.path.next,
-    ),
-  );
-  await editorState.apply(linkPreviewTransaction);
+
+  final replacementTransaction = editorState.transaction
+    ..insertNodes(
+      selection.start.path,
+      replacementInsertedNodes,
+    )
+    ..deleteNode(node)
+    ..afterSelection = Selection.collapsed(
+      Position(path: node.path.next),
+    );
+
+  await editorState.apply(replacementTransaction);
 
   return true;
 }
@@ -235,3 +240,16 @@ Future<void> doPlainPaste(EditorState editorState) async {
   Log.info('unable to parse the clipboard content');
   return;
 }
+
+Future<bool> _isImageUrl(String text) async {
+  final response = await http.head(Uri.parse(text));
+
+  if (response.statusCode == 200) {
+    final contentType = response.headers['content-type'];
+    if (contentType != null) {
+      return contentType.startsWith('image/');
+    }
+  }
+
+  throw 'bad status code';
+}

frontend/appflowy_flutter/lib/shared/patterns/common_patterns.dart

@@ -13,6 +13,9 @@ const _imgUrlPattern =
     r'(https?:\/\/)([^\s(["<,>/]*)(\/)[^\s[",><]*(.png|.jpg|.jpeg|.gif|.webm|.webp|.bmp)(\?[^\s[",><]*)?';
 final imgUrlRegex = RegExp(_imgUrlPattern);
 
+const _singleLineMarkdownImagePattern = "^!\\[.*\\]\\(($_hrefPattern)\\)\$";
+final singleLineMarkdownImageRegex = RegExp(_singleLineMarkdownImagePattern);
+
 /// This pattern allows for both HTTP and HTTPS Scheme
 /// It allows for query parameters
 /// It only allows the following video extensions: