add ExprHeaders

src/main/java/lol/aabss/skhttp/elements/expressions/ExprHeaders.java

@@ -0,0 +1,45 @@
+package lol.aabss.skhttp.elements.expressions;
+
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.expressions.base.SimplePropertyExpression;
+import lol.aabss.skhttp.objects.RequestObject;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.net.http.HttpResponse;
+
+@Name("HTTP Headers")
+@Description("Returns the headers of a http response of request.")
+@Examples({
+        "send headers of {_request}."
+})
+@Since("1.2")
+public class ExprHeaders extends SimplePropertyExpression<Object, String> {
+
+    static {
+        register(ExprHeaders.class, String.class, "[http] headers", "httpresponses/httprequests");
+    }
+
+    @Override
+    protected @NotNull String getPropertyName() {
+        return "headers";
+    }
+
+    @Override
+    public @Nullable String convert(Object object) {
+        if (object instanceof HttpResponse<?>){
+            return ((HttpResponse<?>) object).headers().map().toString();
+        } else if (object instanceof RequestObject){
+            return ((RequestObject) object).request.headers().map().toString();
+        }
+        return "";
+    }
+
+    @Override
+    public @NotNull Class<? extends String> getReturnType() {
+        return String.class;
+    }
+}