LibWeb: Add basic URL encoder for individual values and param lists

Author: https://github.com/shadowfacts
Commit: fcd922f7b1
Pull-request: https://github.com/SerenityOS/serenity/pull/2107

Libraries/LibWeb/DOM/HTMLFormElement.cpp

@@ -29,6 +29,7 @@
 #include <LibWeb/DOM/HTMLInputElement.h>
 #include <LibWeb/Frame.h>
 #include <LibWeb/HtmlView.h>
+#include <LibWeb/URLEncoder.h>
 
 namespace Web {
 
@@ -59,12 +60,7 @@ void HTMLFormElement::submit(RefPtr<HTMLInputElement> submitter)
 
     URL url(document().complete_url(action()));
 
-    struct NameAndValue {
-        String name;
-        String value;
-    };
-
-    Vector<NameAndValue> parameters;
+    Vector<URLQueryParam> parameters;
 
     for_each_in_subtree_of_type<HTMLInputElement>([&](auto& node) {
         auto& input = to<HTMLInputElement>(node);
@@ -73,15 +69,7 @@ void HTMLFormElement::submit(RefPtr<HTMLInputElement> submitter)
         return IterationDecision::Continue;
     });
 
-    StringBuilder builder;
-    for (size_t i = 0; i < parameters.size(); ++i) {
-        builder.append(parameters[i].name);
-        builder.append('=');
-        builder.append(parameters[i].value);
-        if (i != parameters.size() - 1)
-            builder.append('&');
-    }
-    url.set_query(builder.to_string());
+    url.set_query(url_encode(parameters));
 
     // FIXME: We shouldn't let the form just do this willy-nilly.
     document().frame()->html_view()->load(url);