From 7ef4d75716373ebc312490494455a616e30b8ae6 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 19 Sep 2021 22:32:33 +0200
Subject: [PATCH] LibWeb: Implement XMLHttpRequest.getAllResponseHeaders()

---
 .../Libraries/LibWeb/XHR/XMLHttpRequest.cpp   | 19 +++++++++++++++++++
 .../Libraries/LibWeb/XHR/XMLHttpRequest.h     |  1 +
 .../Libraries/LibWeb/XHR/XMLHttpRequest.idl   |  1 +
 3 files changed, 21 insertions(+)

diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
index d211d221a8..2392c302a5 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
@@ -5,6 +5,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/QuickSort.h>
 #include <LibJS/Runtime/FunctionObject.h>
 #include <LibWeb/Bindings/EventWrapper.h>
 #include <LibWeb/Bindings/XMLHttpRequestWrapper.h>
@@ -271,4 +272,22 @@ void XMLHttpRequest::set_onreadystatechange(HTML::EventHandler value)
     set_event_handler_attribute(Web::XHR::EventNames::readystatechange, move(value));
 }
 
+// https://xhr.spec.whatwg.org/#the-getallresponseheaders()-method
+String XMLHttpRequest::get_all_response_headers() const
+{
+    // FIXME: Implement the spec-compliant sort order.
+
+    StringBuilder builder;
+    auto keys = m_response_headers.keys();
+    quick_sort(keys);
+
+    for (auto& key : keys) {
+        builder.append(key);
+        builder.append(": ");
+        builder.append(m_response_headers.get(key).value());
+        builder.append("\r\n");
+    }
+    return builder.to_string();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
index 3449ce8c36..2b91d9230f 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
@@ -57,6 +57,7 @@ public:
     DOM::ExceptionOr<void> set_request_header(const String& header, const String& value);
 
     String get_response_header(const String& name) { return m_response_headers.get(name).value_or({}); }
+    String get_all_response_headers() const;
 
     HTML::EventHandler onreadystatechange();
     void set_onreadystatechange(HTML::EventHandler);
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.idl b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.idl
index 39298e278a..569b3f00b3 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.idl
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.idl
@@ -17,6 +17,7 @@ interface XMLHttpRequest : XMLHttpRequestEventTarget {
     undefined send();
 
     ByteString? getResponseHeader(ByteString name);
+    ByteString getAllResponseHeaders();
 
     attribute EventHandler onreadystatechange;