Contract class version non-downgrade rule is check by LedgerTransaction.verify().
TransactionBuilder.toWireTransaction(services: ServicesForResolution) selects attachments for the transaction which obey non downgrade rule.
New ServiceHub method loadAttachmentConstraint(stateRef: StateRef, forContractClassName: ContractClassName? = null) retrieves the attachment contract related to transaction output states of given contract class name.
* CORDA-2089 - network parameters tags - part
Data structures changes, storage and notarisation.
Tag transactions with network parameters hash that was in force when tx
was created. Add component group on all core transactions and resolved
parameters on full transactions. The hash should be always visible on
the filtered versions of transactions. Add
notarisation check that the parameters are current.
Implement network parameters storage on services for resolution.
This is only part of the work, next PR will include changes to
ResolveTransactionsFlow to make sure that parameters in the transaction
graph are ordered (this is to prevent the downgrade attack, when the
malicious notary and participants sign transaction that shouldn't be
notarised otherwise).
Probably on network services side we need the default parameters
endpoint for the
transactions that were created before this change - for now it's default
to the current ones.
* Make parameters storage agnostic to cert hierarchy
Test fixes
* Address most PR comments
* Fixes after rebase
* Fixes. Add epoch column to parameters storage.
* Address part of review comments
* Some more comments
* Hopefully fixing what I broke doing rebse
* Address Kostas comments
* Further fixes
* Save all parameters from updates to storage
* Fix integration test
* Address comments
* Fixes after rebase
* Fix test
* Fixes
* Add wrapper for filtering around parameters hash
* API stability fixes
* Add NetworkParametersStorageInternal
* Rename
