LibRequests: Move NetworkError stringification to LibRequests

Let's also rename the file to NetworkError.h while we're here. No need
to have "Enum" in the name.

Libraries/LibRequests/CMakeLists.txt

@@ -1,5 +1,5 @@
 set(SOURCES
-    NetworkErrorEnum.h
+    NetworkError.h
     Request.cpp
     RequestClient.cpp
     WebSocket.cpp

Libraries/LibRequests/NetworkError.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2024, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/StringView.h>
+
+namespace Requests {
+
+enum class NetworkError {
+    UnableToResolveProxy,
+    UnableToResolveHost,
+    UnableToConnect,
+    TimeoutReached,
+    TooManyRedirects,
+    SSLHandshakeFailed,
+    SSLVerificationFailed,
+    MalformedUrl,
+    Unknown
+};
+
+constexpr StringView network_error_to_string(NetworkError network_error)
+{
+    switch (network_error) {
+    case NetworkError::UnableToResolveProxy:
+        return "Unable to resolve proxy"sv;
+    case NetworkError::UnableToResolveHost:
+        return "Unable to resolve host"sv;
+    case NetworkError::UnableToConnect:
+        return "Unable to connect"sv;
+    case NetworkError::TimeoutReached:
+        return "Timeout reached"sv;
+    case NetworkError::TooManyRedirects:
+        return "Too many redirects"sv;
+    case NetworkError::SSLHandshakeFailed:
+        return "SSL handshake failed"sv;
+    case NetworkError::SSLVerificationFailed:
+        return "SSL verification failed"sv;
+    case NetworkError::MalformedUrl:
+        return "The URL is not formatted properly"sv;
+    case NetworkError::Unknown:
+        return "An unexpected network error occurred"sv;
+    }
+
+    VERIFY_NOT_REACHED();
+}
+
+}

Libraries/LibRequests/NetworkErrorEnum.h

@@ -1,23 +0,0 @@
-/*
- * Copyright (c) 2024, the Ladybird developers.
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-namespace Requests {
-
-enum class NetworkError {
-    UnableToResolveProxy,
-    UnableToResolveHost,
-    UnableToConnect,
-    TimeoutReached,
-    TooManyRedirects,
-    SSLHandshakeFailed,
-    SSLVerificationFailed,
-    MalformedUrl,
-    Unknown
-};
-
-}

Libraries/LibRequests/Request.h

@@ -14,7 +14,7 @@
 #include <AK/WeakPtr.h>
 #include <LibCore/Notifier.h>
 #include <LibHTTP/HeaderMap.h>
-#include <LibRequests/NetworkErrorEnum.h>
+#include <LibRequests/NetworkError.h>
 #include <LibRequests/RequestTimingInfo.h>
 
 namespace Requests {