LibURL: Clarify whether an Origin is opaque

Origins are immutable and we know on construction whether an Origin is
opaque. This also removes an implicit reliance on Host's Empty state.

Libraries/LibIPC/Decoder.cpp

@@ -100,6 +100,10 @@ ErrorOr<URL::URL> decode(Decoder& decoder)
 template<>
 ErrorOr<URL::Origin> decode(Decoder& decoder)
 {
+    auto is_opaque = TRY(decoder.decode<bool>());
+    if (is_opaque)
+        return URL::Origin {};
+
     auto scheme = TRY(decoder.decode<ByteString>());
     auto host = TRY(decoder.decode<URL::Host>());
     auto port = TRY(decoder.decode<Optional<u16>>());

Libraries/LibIPC/Encoder.cpp

@@ -119,9 +119,14 @@ ErrorOr<void> encode(Encoder& encoder, URL::URL const& value)
 template<>
 ErrorOr<void> encode(Encoder& encoder, URL::Origin const& origin)
 {
-    TRY(encoder.encode<ByteString>(origin.scheme()));
-    TRY(encoder.encode(origin.host()));
-    TRY(encoder.encode(origin.port()));
+    if (origin.is_opaque()) {
+        TRY(encoder.encode(true));
+    } else {
+        TRY(encoder.encode(false));
+        TRY(encoder.encode<ByteString>(origin.scheme()));
+        TRY(encoder.encode(origin.host()));
+        TRY(encoder.encode(origin.port()));
+    }
 
     return {};
 }

Libraries/LibURL/Origin.cpp

@@ -42,13 +42,15 @@ namespace AK {
 
 unsigned Traits<URL::Origin>::hash(URL::Origin const& origin)
 {
+    if (origin.is_opaque())
+        return 0;
+
     unsigned hash = origin.scheme().hash();
 
     if (origin.port().has_value())
         hash = pair_int_hash(hash, *origin.port());
 
-    if (!origin.host().has<Empty>())
-        hash = pair_int_hash(hash, URL::Parser::serialize_host(origin.host()).release_value_but_fixme_should_propagate_errors().hash());
+    hash = pair_int_hash(hash, URL::Parser::serialize_host(origin.host()).release_value_but_fixme_should_propagate_errors().hash());
 
     return hash;
 }

Libraries/LibURL/Origin.h

@@ -16,21 +16,23 @@ class Origin {
 public:
     Origin() = default;
     Origin(Optional<ByteString> const& scheme, Host const& host, Optional<u16> port)
-        : m_scheme(scheme)
-        , m_host(host)
-        , m_port(port)
+        : m_state(State {
+              .scheme = scheme,
+              .host = host,
+              .port = move(port),
+          })
     {
     }
 
     // https://html.spec.whatwg.org/multipage/origin.html#concept-origin-opaque
-    bool is_opaque() const { return !m_scheme.has_value() && m_host.has<Empty>() && !m_port.has_value(); }
+    bool is_opaque() const { return !m_state.has_value(); }
 
     StringView scheme() const
     {
-        return m_scheme.map([](auto& str) { return str.view(); }).value_or(StringView {});
+        return m_state->scheme.map([](auto& str) { return str.view(); }).value_or(StringView {});
     }
-    Host const& host() const { return m_host; }
-    Optional<u16> port() const { return m_port; }
+    Host const& host() const { return m_state->host; }
+    Optional<u16> port() const { return m_state->port; }
 
     // https://html.spec.whatwg.org/multipage/origin.html#same-origin
     bool is_same_origin(Origin const& other) const
@@ -40,10 +42,15 @@ public:
             return true;
 
         // 2. If A and B are both tuple origins and their schemes, hosts, and port are identical, then return true.
-        // 3. Return false.
-        return scheme() == other.scheme()
+        if (!is_opaque() && !other.is_opaque()
+            && scheme() == other.scheme()
             && host() == other.host()
-            && port() == other.port();
+            && port() == other.port()) {
+            return true;
+        }
+
+        // 3. Return false.
+        return false;
     }
 
     // https://html.spec.whatwg.org/multipage/origin.html#same-origin-domain
@@ -83,15 +90,18 @@ public:
         // FIXME: 2. If origin's domain is non-null, then return origin's domain.
 
         // 3. Return origin's host.
-        return m_host;
+        return m_state->host;
     }
 
     bool operator==(Origin const& other) const { return is_same_origin(other); }
 
 private:
-    Optional<ByteString> m_scheme;
-    Host m_host;
-    Optional<u16> m_port;
+    struct State {
+        Optional<ByteString> scheme;
+        Host host;
+        Optional<u16> port;
+    };
+    Optional<State> m_state;
 };
 
 }