pub struct CheckMetadataHash<T> { /* private fields */ }
Expand description
Extension for optionally verifying the metadata hash.
The metadata hash is cryptographical representation of the runtime metadata. This metadata hash is build as described in RFC78. This metadata hash should give users the confidence that what they build with an online wallet is the same they are signing with their offline wallet and then applying on chain. To ensure that the online wallet is not tricking the offline wallet into decoding and showing an incorrect extrinsic, the offline wallet will include the metadata hash into the extension implicit and the runtime will then do the same. If the metadata hash doesn’t match, the signature verification will fail and thus, the transaction will be rejected. The RFC contains more details on how it works.
The extension adds one byte (the mode
) to the size of the extrinsic. This one byte is
controlling if the metadata hash should be added to the implicit or not. Mode 0
means that
the metadata hash is not added and thus, None
is added to the implicit. Mode 1
means that
the metadata hash is added and thus, Some(metadata_hash)
is added to the implicit. Further
values of mode
are reserved for future changes.
The metadata hash is read from the environment variable RUNTIME_METADATA_HASH
. This
environment variable is for example set by the substrate-wasm-builder
when the feature for
generating the metadata hash is enabled. If the environment variable is not set and mode = 1
is passed, the transaction is rejected with [UnknownTransaction::CannotLookup
].
Implementations§
source§impl<T> CheckMetadataHash<T>
impl<T> CheckMetadataHash<T>
Trait Implementations§
source§impl<T: Clone> Clone for CheckMetadataHash<T>
impl<T: Clone> Clone for CheckMetadataHash<T>
source§fn clone(&self) -> CheckMetadataHash<T>
fn clone(&self) -> CheckMetadataHash<T>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<T> Debug for CheckMetadataHash<T>
impl<T> Debug for CheckMetadataHash<T>
source§impl<T> Decode for CheckMetadataHash<T>where
PhantomData<T>: Decode,
impl<T> Decode for CheckMetadataHash<T>where
PhantomData<T>: Decode,
source§fn decode<__CodecInputEdqy: Input>(
__codec_input_edqy: &mut __CodecInputEdqy,
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fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Self, Error>
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§fn skip<I>(input: &mut I) -> Result<(), Error>where
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fn skip<I>(input: &mut I) -> Result<(), Error>where
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§fn encoded_fixed_size() -> Option<usize>
fn encoded_fixed_size() -> Option<usize>
source§impl<T> Encode for CheckMetadataHash<T>where
PhantomData<T>: Encode,
impl<T> Encode for CheckMetadataHash<T>where
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source§fn size_hint(&self) -> usize
fn size_hint(&self) -> usize
source§fn encode_to<__CodecOutputEdqy: Output + ?Sized>(
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§fn using_encoded<R, F>(&self, f: F) -> R
fn using_encoded<R, F>(&self, f: F) -> R
§fn encoded_size(&self) -> usize
fn encoded_size(&self) -> usize
source§impl<T: PartialEq> PartialEq for CheckMetadataHash<T>
impl<T: PartialEq> PartialEq for CheckMetadataHash<T>
source§fn eq(&self, other: &CheckMetadataHash<T>) -> bool
fn eq(&self, other: &CheckMetadataHash<T>) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl<T: Config + Send + Sync> TransactionExtension<<T as Config>::RuntimeCall> for CheckMetadataHash<T>
impl<T: Config + Send + Sync> TransactionExtension<<T as Config>::RuntimeCall> for CheckMetadataHash<T>
source§const IDENTIFIER: &'static str = "CheckMetadataHash"
const IDENTIFIER: &'static str = "CheckMetadataHash"
§type Implicit = Option<[u8; 32]>
type Implicit = Option<[u8; 32]>
implicit
function and not directly contained in the
transaction itself and therefore is considered “implicit”.source§fn implicit(&self) -> Result<Self::Implicit, TransactionValidityError>
fn implicit(&self) -> Result<Self::Implicit, TransactionValidityError>
source§fn weight(&self, _: &T::RuntimeCall) -> Weight
fn weight(&self, _: &T::RuntimeCall) -> Weight
source§fn validate(
&self,
origin: DispatchOriginOf<T::RuntimeCall>,
_call: &T::RuntimeCall,
_info: &DispatchInfoOf<T::RuntimeCall>,
_len: usize,
_self_implicit: Self::Implicit,
_inherited_implication: &impl Encode,
_source: TransactionSource,
) -> ValidateResult<Self::Val, T::RuntimeCall>
fn validate( &self, origin: DispatchOriginOf<T::RuntimeCall>, _call: &T::RuntimeCall, _info: &DispatchInfoOf<T::RuntimeCall>, _len: usize, _self_implicit: Self::Implicit, _inherited_implication: &impl Encode, _source: TransactionSource, ) -> ValidateResult<Self::Val, T::RuntimeCall>
source§fn prepare(
self,
_val: Self::Val,
_origin: &DispatchOriginOf<T::RuntimeCall>,
_call: &T::RuntimeCall,
_info: &DispatchInfoOf<T::RuntimeCall>,
_len: usize,
) -> Result<Self::Pre, TransactionValidityError>
fn prepare( self, _val: Self::Val, _origin: &DispatchOriginOf<T::RuntimeCall>, _call: &T::RuntimeCall, _info: &DispatchInfoOf<T::RuntimeCall>, _len: usize, ) -> Result<Self::Pre, TransactionValidityError>
§fn metadata() -> Vec<TransactionExtensionMetadata>
fn metadata() -> Vec<TransactionExtensionMetadata>
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_pre: Self::Pre,
_info: &<Call as Dispatchable>::Info,
_post_info: &<Call as Dispatchable>::PostInfo,
_len: usize,
_result: &Result<(), DispatchError>,
) -> Result<Weight, TransactionValidityError>
fn post_dispatch_details( _pre: Self::Pre, _info: &<Call as Dispatchable>::Info, _post_info: &<Call as Dispatchable>::PostInfo, _len: usize, _result: &Result<(), DispatchError>, ) -> Result<Weight, TransactionValidityError>
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pre: Self::Pre,
info: &<Call as Dispatchable>::Info,
post_info: &mut <Call as Dispatchable>::PostInfo,
len: usize,
result: &Result<(), DispatchError>,
) -> Result<(), TransactionValidityError>
fn post_dispatch( pre: Self::Pre, info: &<Call as Dispatchable>::Info, post_info: &mut <Call as Dispatchable>::PostInfo, len: usize, result: &Result<(), DispatchError>, ) -> Result<(), TransactionValidityError>
post_dispatch_details
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_call: &Call,
_info: &<Call as Dispatchable>::Info,
_len: usize,
) -> Result<ValidTransaction, TransactionValidityError>
fn bare_validate( _call: &Call, _info: &<Call as Dispatchable>::Info, _len: usize, ) -> Result<ValidTransaction, TransactionValidityError>
source§impl<T> TypeInfo for CheckMetadataHash<T>where
PhantomData<T>: TypeInfo + 'static,
T: 'static,
impl<T> TypeInfo for CheckMetadataHash<T>where
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Auto Trait Implementations§
impl<T> Freeze for CheckMetadataHash<T>
impl<T> RefUnwindSafe for CheckMetadataHash<T>where
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