implemented reading of pdf files

app/lib/features/share_intent/domain/services/sharing_intent.dart

@@ -1,14 +1,52 @@
 import 'dart:async';
 
+import 'package:bang_navigator/core/logger.dart';
 import 'package:bang_navigator/domain/entities/received_parameter.dart';
+import 'package:bang_navigator/features/search_browser/domain/entities/modes.dart';
 import 'package:collection/collection.dart';
+import 'package:flutter_pdf_text/flutter_pdf_text.dart';
 import 'package:flutter_sharing_intent/flutter_sharing_intent.dart';
 import 'package:flutter_sharing_intent/model/sharing_file.dart';
+import 'package:mime/mime.dart' as mime;
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:rxdart/rxdart.dart';
+import 'package:uri_to_file/uri_to_file.dart' as uri_to_file;
 
 part 'sharing_intent.g.dart';
 
+final _sharingIntentTransformer =
+    StreamTransformer<List<SharedFile>, ReceivedParameter>.fromHandlers(
+  handleData: (files, sink) async {
+    //For now only one file is supported to share with the app
+    final data = files.firstOrNull;
+
+    if (data != null && data.value != null) {
+      switch (data.type) {
+        case SharedMediaType.TEXT:
+        case SharedMediaType.URL:
+          if (uri_to_file.isUriSupported(data.value!)) {
+            final file = await uri_to_file.toFile(data.value!);
+            final mimeType = mime.lookupMimeType(file.path);
+            switch (mimeType) {
+              case 'application/pdf':
+                final content =
+                    await PDFDoc.fromFile(file).then((doc) => doc.text);
+                sink.add(
+                  ReceivedParameter(content, KagiTool.summarizer.name),
+                );
+              default:
+                logger.w('Unhandled mime type: $mimeType');
+            }
+          } else {
+            sink.add(ReceivedParameter(data.value, null));
+          }
+        default:
+          logger.w('Unhandled media type: $data');
+      }
+    }
+  },
+);
+
 @riverpod
 Raw<Stream<ReceivedParameter>> sharingIntentStream(SharingIntentStreamRef ref) {
   final initialStream = FlutterSharingIntent.instance
@@ -22,18 +60,5 @@ Raw<Stream<ReceivedParameter>> sharingIntentStream(SharingIntentStreamRef ref) {
 
   return ConcatStream(
     [initialStream, FlutterSharingIntent.instance.getMediaStream()],
-  )
-      .map(
-        (event) => event
-            .where(
-              (shared) =>
-                  shared.type == SharedMediaType.TEXT ||
-                  shared.type == SharedMediaType.URL,
-            )
-            .map((shared) => shared.value)
-            .whereNotNull()
-            .firstOrNull,
-      )
-      .whereNotNull()
-      .map((content) => ReceivedParameter(content, null));
+  ).transform(_sharingIntentTransformer);
 }