Implement origin concept.

components/script/origin.rs

@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::cell::RefCell;
+use std::rc::Rc;
+use url::{OpaqueOrigin, Origin as UrlOrigin};
+use url::{Url, Host};
+
+/// A representation of an [origin](https://html.spec.whatwg.org/multipage/#origin-2).
+#[derive(HeapSizeOf)]
+pub struct Origin {
+    #[ignore_heap_size_of = "Rc<T> has unclear ownership semantics"]
+    inner: Rc<RefCell<UrlOrigin>>,
+}
+
+// We can't use RefCell inside JSTraceable, but Origin doesn't contain JS values and
+// DOMRefCell makes it much harder to write unit tests (due to setting up required TLS).
+no_jsmanaged_fields!(Origin);
+
+impl Origin {
+    /// Create a new origin comprising a unique, opaque identifier.
+    pub fn opaque_identifier() -> Origin {
+        let opaque = UrlOrigin::UID(OpaqueOrigin::new());
+        Origin {
+            inner: Rc::new(RefCell::new(opaque)),
+        }
+    }
+
+    /// Create a new origin for the given URL.
+    pub fn new(url: &Url) -> Origin {
+        Origin {
+            inner: Rc::new(RefCell::new(url.origin())),
+        }
+    }
+
+    pub fn set(&self, origin: UrlOrigin) {
+        *self.inner.borrow_mut() = origin;
+    }
+
+    /// Does this origin represent a host/scheme/port tuple?
+    pub fn is_scheme_host_port_tuple(&self) -> bool {
+        match *self.inner.borrow() {
+            UrlOrigin::Tuple(..) => true,
+            UrlOrigin::UID(..) => false,
+        }
+    }
+
+    /// Return the host associated with this origin.
+    pub fn host(&self) -> Option<Host> {
+        match *self.inner.borrow() {
+            UrlOrigin::Tuple(_, ref host, _) => Some(host.clone()),
+            UrlOrigin::UID(..) => None,
+        }
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#same-origin
+    pub fn same_origin(&self, other: &Origin) -> bool {
+        *self.inner.borrow() == *other.inner.borrow()
+    }
+
+    pub fn copy(&self) -> Origin {
+        Origin {
+            inner: Rc::new(RefCell::new(self.inner.borrow().clone())),
+        }
+    }
+
+    pub fn alias(&self) -> Origin {
+        Origin {
+            inner: self.inner.clone(),
+        }
+    }
+}