f - return all the chain hash

Author: jkczyz

lightning/src/offers/offer.rs

@@ -53,13 +53,13 @@ pub(crate) struct OfferContents {
 }
 
 impl Offer {
+	// TODO: Return a slice once ChainHash has constants.
 	/// The chain used for paying the invoice.
-	pub fn chain(&self) -> ChainHash {
-		// TODO: Update once spec is finalized
+	pub fn chains(&self) -> Vec<ChainHash> {
 		self.contents.chains
 			.as_ref()
-			.and_then(|chains| chains.first().copied())
-			.unwrap_or_else(|| ChainHash::using_genesis_block(Network::Bitcoin))
+			.cloned()
+			.unwrap_or_else(|| vec![ChainHash::using_genesis_block(Network::Bitcoin)])
 	}
 
 	/// Metadata set by the originator. Useful for authentication and validating fields.