From 355e373ce5cad685914e1dea8857ad23d4a17e07 Mon Sep 17 00:00:00 2001
From: Kemal Zebari <kemalzebra@gmail.com>
Date: Tue, 19 Sep 2023 23:46:31 -0700
Subject: [PATCH] LibWeb/MimeSniff: Add `MimeType::is_json()`

---
 Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp | 7 +++++++
 Userland/Libraries/LibWeb/MimeSniff/MimeType.h   | 1 +
 2 files changed, 8 insertions(+)

diff --git a/Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp b/Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp
index e327d9bded..fa150252e3 100644
--- a/Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp
+++ b/Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp
@@ -335,4 +335,11 @@ bool MimeType::is_javascript() const
         "text/x-javascript"sv);
 }
 
+// https://mimesniff.spec.whatwg.org/#json-mime-type
+bool MimeType::is_json() const
+{
+    // A JSON MIME type is any MIME type whose subtype ends in "+json" or whose essence is "application/json" or "text/json".
+    return subtype().ends_with_bytes("+json"sv) || essence().is_one_of("application/json"sv, "text/json"sv);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/MimeSniff/MimeType.h b/Userland/Libraries/LibWeb/MimeSniff/MimeType.h
index 5fd01918e6..d85578842e 100644
--- a/Userland/Libraries/LibWeb/MimeSniff/MimeType.h
+++ b/Userland/Libraries/LibWeb/MimeSniff/MimeType.h
@@ -35,6 +35,7 @@ public:
     bool is_html() const;
     bool is_scriptable() const;
     bool is_javascript() const;
+    bool is_json() const;
 
     ErrorOr<void> set_parameter(String name, String value);