LibWeb/IDB: Implement IDBCursor::primary_key

Author: https://github.com/stelar7
Commit: 8f876e824b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4650
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/IndexedDB/IDBCursor.cpp

@@ -162,4 +162,11 @@ WebIDL::ExceptionOr<void> IDBCursor::continue_(JS::Value key)
         });
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbcursor-primarykey
+JS::Value IDBCursor::primary_key() const
+{
+    // The primaryKey getter steps are to return the result of converting a key to a value with the cursor’s current effective key.
+    return convert_a_key_to_a_value(realm(), effective_key());
+}
+
 }

Libraries/LibWeb/IndexedDB/IDBCursor.h

@@ -43,6 +43,7 @@ public:
     [[nodiscard]] GC::Ref<IDBTransaction> transaction();
     [[nodiscard]] CursorSource internal_source();
     [[nodiscard]] GC::Ref<Key> effective_key() const;
+    [[nodiscard]] JS::Value primary_key() const;
 
     void set_request(GC::Ptr<IDBRequest> request) { m_request = request; }
     void set_position(GC::Ptr<Key> position) { m_position = position; }

Libraries/LibWeb/IndexedDB/IDBCursor.idl

@@ -5,7 +5,7 @@ interface IDBCursor {
     [ImplementedAs=source_handle] readonly attribute (IDBObjectStore or IDBIndex) source;
     readonly attribute IDBCursorDirection direction;
     readonly attribute any key;
-    [FIXME] readonly attribute any primaryKey;
+    readonly attribute any primaryKey;
     [SameObject] readonly attribute IDBRequest request;
     [FIXME] undefined advance([EnforceRange] unsigned long count);
     undefined continue(optional any key);