WebDriver: Implement `GET /session/{id}/element/{id}/attribute/{name}`

Userland/Applications/Browser/WebDriverConnection.cpp

@@ -144,4 +144,15 @@ Messages::WebDriverSessionClient::QuerySelectorAllResponse WebDriverConnection::
     return { {} };
 }
 
+Messages::WebDriverSessionClient::GetElementAttributeResponse WebDriverConnection::get_element_attribute(i32 element_id, String const& name)
+{
+    dbgln("WebDriverConnection: get_element_attribute");
+    if (auto browser_window = m_browser_window.strong_ref()) {
+        auto& tab = browser_window->active_tab();
+        if (tab.on_get_element_attribute)
+            return { tab.on_get_element_attribute(element_id, name) };
+    }
+    return { {} };
+}
+
 }

Userland/Applications/Browser/WebDriverConnection.h

@@ -49,6 +49,7 @@ public:
     virtual void update_cookie(Web::Cookie::Cookie const&) override;
     virtual Messages::WebDriverSessionClient::GetDocumentElementResponse get_document_element() override;
     virtual Messages::WebDriverSessionClient::QuerySelectorAllResponse query_selector_all(i32 start_node_id, String const& selector) override;
+    virtual Messages::WebDriverSessionClient::GetElementAttributeResponse get_element_attribute(i32 element_id, String const& name) override;
 
 private:
     WebDriverConnection(NonnullOwnPtr<Core::Stream::LocalSocket> socket, NonnullRefPtr<BrowserWindow> browser_window);

Userland/Applications/Browser/WebDriverSessionClient.ipc

@@ -18,5 +18,6 @@ endpoint WebDriverSessionClient {
     update_cookie(Web::Cookie::Cookie cookie) =|
     get_document_element() => (Optional<i32> document_element_id)
     query_selector_all(i32 start_node_id, String selector) => (Optional<Vector<i32>> elements_ids)
+    get_element_attribute(i32 element_id, String name) => (Optional<String> atttibute)
 
 }

Userland/Services/WebDriver/Client.cpp

@@ -36,6 +36,7 @@ Vector<Client::Route> Client::s_routes = {
     { HTTP::HttpRequest::Method::POST, { "session", ":session_id", "elements" }, &Client::handle_find_elements },
     { HTTP::HttpRequest::Method::POST, { "session", ":session_id", "element", ":element_id", "element" }, &Client::handle_find_element_from_element },
     { HTTP::HttpRequest::Method::POST, { "session", ":session_id", "element", ":element_id", "elements" }, &Client::handle_find_elements_from_element },
+    { HTTP::HttpRequest::Method::GET, { "session", ":session_id", "element", ":element_id", "attribute", ":name" }, &Client::handle_get_element_attribute },
     { HTTP::HttpRequest::Method::GET, { "session", ":session_id", "cookie" }, &Client::handle_get_all_cookies },
     { HTTP::HttpRequest::Method::GET, { "session", ":session_id", "cookie", ":name" }, &Client::handle_get_named_cookie },
     { HTTP::HttpRequest::Method::POST, { "session", ":session_id", "cookie" }, &Client::handle_add_cookie },
@@ -579,6 +580,19 @@ ErrorOr<JsonValue, HttpError> Client::handle_find_elements_from_element(Vector<S
     return make_json_value(result);
 }
 
+// 12.4.2 Get Element Attribute, https://w3c.github.io/webdriver/#dfn-get-element-attribute
+// GET /session/{session id}/element/{element id}/attribute/{name}
+ErrorOr<JsonValue, HttpError> Client::handle_get_element_attribute(Vector<StringView> const& parameters, JsonValue const& payload)
+{
+    dbgln_if(WEBDRIVER_DEBUG, "Handling GET /session/<session_id>/element/<element_id>/attribute/<name>");
+    auto* session = TRY(find_session_with_id(parameters[0]));
+
+    // NOTE: Spec steps handled in Session::get_element_attribute().
+    auto result = TRY(session->get_element_attribute(payload, parameters[1], parameters[2]));
+
+    return make_json_value(result);
+}
+
 // 14.1 Get All Cookies, https://w3c.github.io/webdriver/#dfn-get-all-cookies
 // GET /session/{session id}/cookie
 ErrorOr<JsonValue, HttpError> Client::handle_get_all_cookies(Vector<StringView> const& parameters, JsonValue const&)

Userland/Services/WebDriver/Client.h

@@ -61,6 +61,7 @@ private:
     ErrorOr<JsonValue, HttpError> handle_find_elements(Vector<StringView> const&, JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> handle_find_element_from_element(Vector<StringView> const&, JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> handle_find_elements_from_element(Vector<StringView> const&, JsonValue const& payload);
+    ErrorOr<JsonValue, HttpError> handle_get_element_attribute(Vector<StringView> const&, JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> handle_get_all_cookies(Vector<StringView> const&, JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> handle_get_named_cookie(Vector<StringView> const&, JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> handle_add_cookie(Vector<StringView> const&, JsonValue const& payload);

Userland/Services/WebDriver/Session.cpp

@@ -577,6 +577,42 @@ ErrorOr<JsonValue, HttpError> Session::find_elements_from_element(JsonValue cons
     return JsonValue(result);
 }
 
+// 12.4.2 Get Element Attribute, https://w3c.github.io/webdriver/#dfn-get-element-attribute
+ErrorOr<JsonValue, HttpError> Session::get_element_attribute(JsonValue const&, StringView parameter_element_id, StringView name)
+{
+    // 1. If the current browsing context is no longer open, return error with error code no such window.
+    auto current_window = get_window_object();
+    if (!current_window.has_value())
+        return HttpError { 404, "no such window", "Window not found" };
+
+    // FIXME: 2. Handle any user prompts and return its value if it is an error.
+
+    // FIXME: 3. Let element be the result of trying to get a known connected element with url variable element id.
+    // NOTE: The whole concept of "connected elements" is not implemented yet. See get_or_create_a_web_element_reference()
+    //       For now the element is only represented by its ID
+    auto maybe_element_id = parameter_element_id.to_int();
+    if (!maybe_element_id.has_value())
+        return HttpError { 400, "invalid argument", "Element ID is not an i32" };
+
+    auto element_id = maybe_element_id.release_value();
+
+    // FIXME: The case that the element does not exist is not handled at all and null is returned in that case.
+
+    // 4. Let result be the result of the first matching condition:
+    // -> FIXME: If name is a boolean attribute
+    //    NOTE: LibWeb doesn't know about boolean attributes directly
+    //    "true" (string) if the element has the attribute, otherwise null.
+    // -> Otherwise
+    //    The result of getting an attribute by name name.
+    auto result = m_browser_connection->get_element_attribute(element_id, name);
+
+    if (!result.has_value())
+        return JsonValue(AK::JsonValue::Type::Null);
+
+    // 5. Return success with data result.
+    return JsonValue(result.release_value());
+}
+
 // https://w3c.github.io/webdriver/#dfn-serialized-cookie
 static JsonObject serialize_cookie(Web::Cookie::Cookie const& cookie)
 {

Userland/Services/WebDriver/Session.h

@@ -47,6 +47,7 @@ public:
     ErrorOr<JsonValue, HttpError> find_elements(JsonValue const& payload);
     ErrorOr<JsonValue, HttpError> find_element_from_element(JsonValue const& payload, StringView parameter_element_id);
     ErrorOr<JsonValue, HttpError> find_elements_from_element(JsonValue const& payload, StringView parameter_element_id);
+    ErrorOr<JsonValue, HttpError> get_element_attribute(JsonValue const& payload, StringView element_id, StringView name);
     ErrorOr<void, Variant<HttpError, Error>> close_window();
     ErrorOr<JsonValue, HttpError> get_all_cookies();
     ErrorOr<JsonValue, HttpError> get_named_cookie(String const& name);