1 files changed, 33 insertions, 0 deletions
diff --git a/src/origins.rs b/src/origins.rs
new file mode 100644
index 0000000..c2a7dc1
--- /dev/null
+++ b/src/origins.rs
@@ -0,0 +1,33 @@
+use std::str::FromStr;
+use url::Url;
+
+#[derive(Clone, Debug)]
+pub(crate) struct HttpOrigin {
+    pub origin: String,
+    pub host_idx: usize,
+}
+
+impl HttpOrigin {
+    /// Returns the Host header value (e.g. `example.com` for the origin `https://example.com`).
+    pub fn host(&self) -> &str {
+        &self.origin[self.host_idx..]
+    }
+}
+
+impl FromStr for HttpOrigin {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let url = Url::parse(s).map_err(|_| "invalid URL")?;
+        if url.scheme() != "http" && url.scheme() != "https" {
+            return Err("expected http:// or https:// scheme");
+        }
+        if url.path() != "/" {
+            return Err("path must be /".into());
+        }
+        Ok(HttpOrigin {
+            origin: url.origin().ascii_serialization(),
+            host_idx: url.scheme().len() + "://".len(),
+        })
+    }
+}