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

Userland/Applications/Browser/WebDriverConnection.cpp

@@ -166,4 +166,26 @@ Messages::WebDriverSessionClient::GetElementPropertyResponse WebDriverConnection
     return { {} };
 }
 
+Messages::WebDriverSessionClient::GetActiveDocumentsTypeResponse WebDriverConnection::get_active_documents_type()
+{
+    dbgln("WebDriverConnection: get_active_documents_type");
+    if (auto browser_window = m_browser_window.strong_ref()) {
+        auto& tab = browser_window->active_tab();
+        if (tab.on_get_active_documents_type)
+            return { tab.on_get_active_documents_type() };
+    }
+    return { "" };
+}
+
+Messages::WebDriverSessionClient::GetComputedValueForElementResponse WebDriverConnection::get_computed_value_for_element(i32 element_id, String const& property_name)
+{
+    dbgln("WebDriverConnection: get_computed_value_for_element");
+    if (auto browser_window = m_browser_window.strong_ref()) {
+        auto& tab = browser_window->active_tab();
+        if (tab.on_get_computed_value_for_element)
+            return { tab.on_get_computed_value_for_element(element_id, property_name) };
+    }
+    return { "" };
+}
+
 }

Userland/Applications/Browser/WebDriverConnection.h

@@ -51,6 +51,8 @@ public:
     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;
     virtual Messages::WebDriverSessionClient::GetElementPropertyResponse get_element_property(i32 element_id, String const& name) override;
+    virtual Messages::WebDriverSessionClient::GetActiveDocumentsTypeResponse get_active_documents_type() override;
+    virtual Messages::WebDriverSessionClient::GetComputedValueForElementResponse get_computed_value_for_element(i32 element_id, String const& property_name) override;
 
 private:
     WebDriverConnection(NonnullOwnPtr<Core::Stream::LocalSocket> socket, NonnullRefPtr<BrowserWindow> browser_window);

Userland/Applications/Browser/WebDriverSessionClient.ipc

@@ -20,5 +20,7 @@ endpoint WebDriverSessionClient {
     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)
     get_element_property(i32 element_id, String name) => (Optional<String> property)
+    get_active_documents_type() => (String type)
+    get_computed_value_for_element(i32 element_id, String property_name) => (String computed_value)
 
 }

Userland/Services/WebDriver/Client.cpp

@@ -42,6 +42,7 @@ Vector<Client::Route> Client::s_routes = {
     { 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", "element", ":element_id", "property", ":name" }, &Client::handle_get_element_property },
+    { HTTP::HttpRequest::Method::GET, { "session", ":session_id", "element", ":element_id", "css", ":property_name" }, &Client::handle_get_element_css_value },
     { 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 },
@@ -601,6 +602,16 @@ ErrorOr<JsonValue, HttpError> Client::handle_get_element_property(Vector<StringV
     return make_json_value(result);
 }
 
+// 12.4.4 Get Element CSS Value, https://w3c.github.io/webdriver/#dfn-get-element-css-value
+// GET /session/{session id}/element/{element id}/css/{property name}
+ErrorOr<JsonValue, HttpError> Client::handle_get_element_css_value(Vector<StringView> const& parameters, JsonValue const& payload)
+{
+    dbgln_if(WEBDRIVER_DEBUG, "Handling GET /session/<session_id>/element/<element_id>/css/<property_name>");
+    auto* session = TRY(find_session_with_id(parameters[0]));
+    auto result = TRY(session->get_element_css_value(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

@@ -67,6 +67,7 @@ private:
     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_element_property(Vector<StringView> const&, JsonValue const& payload);
+    ErrorOr<JsonValue, HttpError> handle_get_element_css_value(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

@@ -693,6 +693,40 @@ ErrorOr<JsonValue, HttpError> Session::get_element_property(JsonValue const&, St
     return JsonValue(property.release_value());
 }
 
+// 12.4.4 Get Element CSS Value, https://w3c.github.io/webdriver/#dfn-get-element-css-value
+ErrorOr<JsonValue, HttpError> Session::get_element_css_value(JsonValue const&, StringView parameter_element_id, StringView property_name)
+{
+    // 1. If the current browsing context is no longer open, return error with error code no such window.
+    auto current_window = this->current_window();
+    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();
+
+    // 4. Let computed value be the result of the first matching condition:
+    // -> current browsing context’s active document’s type is not "xml"
+    //    computed value of parameter property name from element’s style declarations. property name is obtained from url variables.
+    // -> Otherwise
+    //    "" (empty string)
+    auto active_documents_type = m_browser_connection->get_active_documents_type();
+    if (active_documents_type == "xml")
+        return JsonValue("");
+
+    auto computed_value = m_browser_connection->get_computed_value_for_element(element_id, property_name);
+
+    // 5. Return success with data computed value.
+    return JsonValue(computed_value);
+}
+
 // https://w3c.github.io/webdriver/#dfn-serialized-cookie
 static JsonObject serialize_cookie(Web::Cookie::Cookie const& cookie)
 {

Userland/Services/WebDriver/Session.h

@@ -55,6 +55,7 @@ public:
     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<JsonValue, HttpError> get_element_property(JsonValue const& payload, StringView element_id, StringView name);
+    ErrorOr<JsonValue, HttpError> get_element_css_value(JsonValue const& payload, StringView element_id, StringView property_name);
     ErrorOr<JsonValue, HttpError> get_all_cookies();
     ErrorOr<JsonValue, HttpError> get_named_cookie(String const& name);
     ErrorOr<JsonValue, HttpError> add_cookie(JsonValue const& payload);