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[xcm] BridgeBlobDispatcher - prepend bridge instance discriminator. (#7438)

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This commit is contained in:
Branislav Kontur
2023-07-03 15:03:47 +02:00
committed by GitHub
parent a7e3196b33
commit 77ef85b04d
7 changed files with 27 additions and 12 deletions
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polkadot/xcm/xcm-builder/src/universal_exports.rs
+17 -4
View File
@@ -332,9 +332,14 @@ pub enum DispatchBlobError {
WrongGlobal,
}
pub struct BridgeBlobDispatcher<Router, OurPlace>(PhantomData<(Router, OurPlace)>);
impl<Router: SendXcm, OurPlace: Get<InteriorMultiLocation>> DispatchBlob
for BridgeBlobDispatcher<Router, OurPlace>
pub struct BridgeBlobDispatcher<Router, OurPlace, OurPlaceBridgeInstance>(
PhantomData<(Router, OurPlace, OurPlaceBridgeInstance)>,
);
impl<
Router: SendXcm,
OurPlace: Get<InteriorMultiLocation>,
OurPlaceBridgeInstance: Get<Option<InteriorMultiLocation>>,
> DispatchBlob for BridgeBlobDispatcher<Router, OurPlace, OurPlaceBridgeInstance>
{
fn dispatch_blob(blob: Vec<u8>) -> Result<(), DispatchBlobError> {
let our_universal = OurPlace::get();
@@ -352,8 +357,16 @@ impl<Router: SendXcm, OurPlace: Get<InteriorMultiLocation>> DispatchBlob
.map_err(|()| DispatchBlobError::NonUniversalDestination)?;
ensure!(intended_global == our_global, DispatchBlobError::WrongGlobal);
let dest = universal_dest.relative_to(&our_universal);
let message: Xcm<()> =
let mut message: Xcm<()> =
message.try_into().map_err(|_| DispatchBlobError::UnsupportedXcmVersion)?;
// Prepend our bridge instance discriminator.
// Can be used for fine-grained control of origin on destination in case of multiple bridge instances,
// e.g. restrict `type UniversalAliases` and `UniversalOrigin` instruction to trust just particular bridge instance for `NetworkId`.
if let Some(bridge_instance) = OurPlaceBridgeInstance::get() {
message.0.insert(0, DescendOrigin(bridge_instance));
}
let _ = send_xcm::<Router>(dest, message).map_err(|_| DispatchBlobError::RoutingError)?;
Ok(())
}