Rename user-agent header to device-id

backend/sync_server/src/server/device_id_header.rs

@@ -0,0 +1,33 @@
+use axum_extra::headers;
+use headers::{Header, HeaderName, HeaderValue};
+
+pub struct DeviceIdHeader(pub String);
+
+pub static DEVICE_ID_HEADER_NAME: HeaderName = HeaderName::from_static("device-id");
+
+impl Header for DeviceIdHeader {
+    fn name() -> &'static HeaderName { &DEVICE_ID_HEADER_NAME }
+
+    fn decode<'i, I>(values: &mut I) -> Result<Self, headers::Error>
+    where
+        I: Iterator<Item = &'i HeaderValue>,
+    {
+        let value = values.next().ok_or_else(headers::Error::invalid)?;
+
+        Ok(DeviceIdHeader(
+            value
+                .to_str()
+                .map_err(|_| headers::Error::invalid())?
+                .to_owned(),
+        ))
+    }
+
+    fn encode<E>(&self, values: &mut E)
+    where
+        E: Extend<HeaderValue>,
+    {
+        let value = HeaderValue::from_static(Box::leak(self.0.to_string().into_boxed_str()));
+
+        values.extend(std::iter::once(value));
+    }
+}