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// This file is part of Substrate.
// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! This module contains helper methods to configure attributes for items and collections in the
//! NFTs pallet.
//! The bitflag [`PalletFeature::Attributes`] needs to be set in [`Config::Features`] for NFTs
//! to have the functionality defined in this module.
use crate::*;
use frame_support::pallet_prelude::*;
impl<T: Config<I>, I: 'static> Pallet<T, I> {
/// Sets the attribute of an item or a collection.
///
/// This function is used to set an attribute for an item or a collection. It checks the
/// provided `namespace` and verifies the permission of the caller to perform the action. The
/// `collection` and `maybe_item` parameters specify the target for the attribute.
///
/// - `origin`: The account attempting to set the attribute.
/// - `collection`: The identifier of the collection to which the item belongs, or the
/// collection itself if setting a collection attribute.
/// - `maybe_item`: The identifier of the item to which the attribute belongs, or `None` if
/// setting a collection attribute.
/// - `namespace`: The namespace in which the attribute is being set. It can be either
/// `CollectionOwner`, `ItemOwner`, or `Account` (pre-approved external address).
/// - `key`: The key of the attribute. It should be a vector of bytes within the limits defined
/// by `T::KeyLimit`.
/// - `value`: The value of the attribute. It should be a vector of bytes within the limits
/// defined by `T::ValueLimit`.
/// - `depositor`: The account that is paying the deposit for the attribute.
///
/// Note: For the `CollectionOwner` namespace, the collection/item must have the
/// `UnlockedAttributes` setting enabled.
/// The deposit for setting an attribute is based on the `T::DepositPerByte` and
/// `T::AttributeDepositBase` configuration.
pub(crate) fn do_set_attribute(
origin: T::AccountId,
collection: T::CollectionId,
maybe_item: Option<T::ItemId>,
namespace: AttributeNamespace<T::AccountId>,
key: BoundedVec<u8, T::KeyLimit>,
value: BoundedVec<u8, T::ValueLimit>,
depositor: T::AccountId,
) -> DispatchResult {
ensure!(
Self::is_pallet_feature_enabled(PalletFeature::Attributes),
Error::<T, I>::MethodDisabled
);
ensure!(
Self::is_valid_namespace(&origin, &namespace, &collection, &maybe_item)?,
Error::<T, I>::NoPermission
);
let collection_config = Self::get_collection_config(&collection)?;
// for the `CollectionOwner` namespace we need to check if the collection/item is not locked
match namespace {
AttributeNamespace::CollectionOwner => match maybe_item {
None => {
ensure!(
collection_config.is_setting_enabled(CollectionSetting::UnlockedAttributes),
Error::<T, I>::LockedCollectionAttributes
)
},
Some(item) => {
let maybe_is_locked = Self::get_item_config(&collection, &item)
.map(|c| c.has_disabled_setting(ItemSetting::UnlockedAttributes))?;
ensure!(!maybe_is_locked, Error::<T, I>::LockedItemAttributes);
},
},
_ => (),
}
let mut collection_details =
Collection::<T, I>::get(&collection).ok_or(Error::<T, I>::UnknownCollection)?;
let attribute = Attribute::<T, I>::get((collection, maybe_item, &namespace, &key));
let attribute_exists = attribute.is_some();
if !attribute_exists {
collection_details.attributes.saturating_inc();
}
let old_deposit =
attribute.map_or(AttributeDeposit { account: None, amount: Zero::zero() }, |m| m.1);
let mut deposit = Zero::zero();
// disabled DepositRequired setting only affects the CollectionOwner namespace
if collection_config.is_setting_enabled(CollectionSetting::DepositRequired) ||
namespace != AttributeNamespace::CollectionOwner
{
deposit = T::DepositPerByte::get()
.saturating_mul(((key.len() + value.len()) as u32).into())
.saturating_add(T::AttributeDepositBase::get());
}
let is_collection_owner_namespace = namespace == AttributeNamespace::CollectionOwner;
let is_depositor_collection_owner =
is_collection_owner_namespace && collection_details.owner == depositor;
// NOTE: in the CollectionOwner namespace if the depositor is `None` that means the deposit
// was paid by the collection's owner.
let old_depositor =
if is_collection_owner_namespace && old_deposit.account.is_none() && attribute_exists {
Some(collection_details.owner.clone())
} else {
old_deposit.account
};
let depositor_has_changed = old_depositor != Some(depositor.clone());
// NOTE: when we transfer an item, we don't move attributes in the ItemOwner namespace.
// When the new owner updates the same attribute, we will update the depositor record
// and return the deposit to the previous owner.
if depositor_has_changed {
if let Some(old_depositor) = old_depositor {
T::Currency::unreserve(&old_depositor, old_deposit.amount);
}
T::Currency::reserve(&depositor, deposit)?;
} else if deposit > old_deposit.amount {
T::Currency::reserve(&depositor, deposit - old_deposit.amount)?;
} else if deposit < old_deposit.amount {
T::Currency::unreserve(&depositor, old_deposit.amount - deposit);
}
if is_depositor_collection_owner {
if !depositor_has_changed {
collection_details.owner_deposit.saturating_reduce(old_deposit.amount);
}
collection_details.owner_deposit.saturating_accrue(deposit);
}
let new_deposit_owner = match is_depositor_collection_owner {
true => None,
false => Some(depositor),
};
Attribute::<T, I>::insert(
(&collection, maybe_item, &namespace, &key),
(&value, AttributeDeposit { account: new_deposit_owner, amount: deposit }),
);
Collection::<T, I>::insert(collection, &collection_details);
Self::deposit_event(Event::AttributeSet { collection, maybe_item, key, value, namespace });
Ok(())
}
/// Sets the attribute of an item or a collection without performing deposit checks.
///
/// This function is used to force-set an attribute for an item or a collection without
/// performing the deposit checks. It bypasses the deposit requirement and should only be used
/// in specific situations where deposit checks are not necessary or handled separately.
///
/// - `set_as`: The account that would normally pay for the deposit.
/// - `collection`: The identifier of the collection to which the item belongs, or the
/// collection itself if setting a collection attribute.
/// - `maybe_item`: The identifier of the item to which the attribute belongs, or `None` if
/// setting a collection attribute.
/// - `namespace`: The namespace in which the attribute is being set. It can be either
/// `CollectionOwner`, `ItemOwner`, or `Account` (pre-approved external address).
/// - `key`: The key of the attribute. It should be a vector of bytes within the limits defined
/// by `T::KeyLimit`.
/// - `value`: The value of the attribute. It should be a vector of bytes within the limits
/// defined by `T::ValueLimit`.
pub(crate) fn do_force_set_attribute(
set_as: Option<T::AccountId>,
collection: T::CollectionId,
maybe_item: Option<T::ItemId>,
namespace: AttributeNamespace<T::AccountId>,
key: BoundedVec<u8, T::KeyLimit>,
value: BoundedVec<u8, T::ValueLimit>,
) -> DispatchResult {
let mut collection_details =
Collection::<T, I>::get(&collection).ok_or(Error::<T, I>::UnknownCollection)?;
let attribute = Attribute::<T, I>::get((collection, maybe_item, &namespace, &key));
if let Some((_, deposit)) = attribute {
if deposit.account != set_as && deposit.amount != Zero::zero() {
if let Some(deposit_account) = deposit.account {
T::Currency::unreserve(&deposit_account, deposit.amount);
}
}
} else {
collection_details.attributes.saturating_inc();
}
Attribute::<T, I>::insert(
(&collection, maybe_item, &namespace, &key),
(&value, AttributeDeposit { account: set_as, amount: Zero::zero() }),
);
Collection::<T, I>::insert(collection, &collection_details);
Self::deposit_event(Event::AttributeSet { collection, maybe_item, key, value, namespace });
Ok(())
}
/// Sets multiple attributes for an item or a collection.
///
/// This function checks the pre-signed data is valid and updates the attributes of an item or
/// collection. It is limited by [`Config::MaxAttributesPerCall`] to prevent excessive storage
/// consumption in a single transaction.
///
/// - `origin`: The account initiating the transaction.
/// - `data`: The data containing the details of the pre-signed attributes to be set.
/// - `signer`: The account of the pre-signed attributes signer.
pub(crate) fn do_set_attributes_pre_signed(
origin: T::AccountId,
data: PreSignedAttributesOf<T, I>,
signer: T::AccountId,
) -> DispatchResult {
let PreSignedAttributes { collection, item, attributes, namespace, deadline } = data;
ensure!(
attributes.len() <= T::MaxAttributesPerCall::get() as usize,
Error::<T, I>::MaxAttributesLimitReached
);
let now = T::BlockNumberProvider::current_block_number();
ensure!(deadline >= now, Error::<T, I>::DeadlineExpired);
let item_details =
Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
ensure!(item_details.owner == origin, Error::<T, I>::NoPermission);
// Only the CollectionOwner and Account() namespaces could be updated in this way.
// For the Account() namespace we check and set the approval if it wasn't set before.
match &namespace {
AttributeNamespace::CollectionOwner => {},
AttributeNamespace::Account(account) => {
ensure!(account == &signer, Error::<T, I>::NoPermission);
let approvals = ItemAttributesApprovalsOf::<T, I>::get(&collection, &item);
if !approvals.contains(account) {
Self::do_approve_item_attributes(
origin.clone(),
collection,
item,
account.clone(),
)?;
}
},
_ => return Err(Error::<T, I>::WrongNamespace.into()),
}
for (key, value) in attributes {
Self::do_set_attribute(
signer.clone(),
collection,
Some(item),
namespace.clone(),
Self::construct_attribute_key(key)?,
Self::construct_attribute_value(value)?,
origin.clone(),
)?;
}
Self::deposit_event(Event::PreSignedAttributesSet { collection, item, namespace });
Ok(())
}
/// Clears an attribute of an item or a collection.
///
/// This function allows clearing an attribute from an item or a collection. It verifies the
/// permission of the caller to perform the action based on the provided `namespace` and
/// `depositor` account. The deposit associated with the attribute, if any, will be unreserved.
///
/// - `maybe_check_origin`: An optional account that acts as an additional security check when
/// clearing the attribute. This can be `None` if no additional check is required.
/// - `collection`: The identifier of the collection to which the item belongs, or the
/// collection itself if clearing a collection attribute.
/// - `maybe_item`: The identifier of the item to which the attribute belongs, or `None` if
/// clearing a collection attribute.
/// - `namespace`: The namespace in which the attribute is being cleared. It can be either
/// `CollectionOwner`, `ItemOwner`, or `Account`.
/// - `key`: The key of the attribute to be cleared. It should be a vector of bytes within the
/// limits defined by `T::KeyLimit`.
pub(crate) fn do_clear_attribute(
maybe_check_origin: Option<T::AccountId>,
collection: T::CollectionId,
maybe_item: Option<T::ItemId>,
namespace: AttributeNamespace<T::AccountId>,
key: BoundedVec<u8, T::KeyLimit>,
) -> DispatchResult {
let (_, deposit) = Attribute::<T, I>::take((collection, maybe_item, &namespace, &key))
.ok_or(Error::<T, I>::AttributeNotFound)?;
if let Some(check_origin) = &maybe_check_origin {
// validate the provided namespace when it's not a root call and the caller is not
// the same as the `deposit.account` (e.g. the deposit was paid by different account)
if deposit.account != maybe_check_origin {
ensure!(
Self::is_valid_namespace(&check_origin, &namespace, &collection, &maybe_item)?,
Error::<T, I>::NoPermission
);
}
// can't clear `CollectionOwner` type attributes if the collection/item is locked
match namespace {
AttributeNamespace::CollectionOwner => match maybe_item {
None => {
let collection_config = Self::get_collection_config(&collection)?;
ensure!(
collection_config
.is_setting_enabled(CollectionSetting::UnlockedAttributes),
Error::<T, I>::LockedCollectionAttributes
)
},
Some(item) => {
// NOTE: if the item was previously burned, the ItemConfigOf record
// might not exist. In that case, we allow to clear the attribute.
let maybe_is_locked = Self::get_item_config(&collection, &item)
.map_or(None, |c| {
Some(c.has_disabled_setting(ItemSetting::UnlockedAttributes))
});
if let Some(is_locked) = maybe_is_locked {
ensure!(!is_locked, Error::<T, I>::LockedItemAttributes);
// Only the collection's admin can clear attributes in that namespace.
// e.g. in off-chain mints, the attribute's depositor will be the item's
// owner, that's why we need to do this extra check.
ensure!(
Self::has_role(&collection, &check_origin, CollectionRole::Admin),
Error::<T, I>::NoPermission
);
}
},
},
_ => (),
};
}
let mut collection_details =
Collection::<T, I>::get(&collection).ok_or(Error::<T, I>::UnknownCollection)?;
collection_details.attributes.saturating_dec();
match deposit.account {
Some(deposit_account) => {
T::Currency::unreserve(&deposit_account, deposit.amount);
},
None if namespace == AttributeNamespace::CollectionOwner => {
collection_details.owner_deposit.saturating_reduce(deposit.amount);
T::Currency::unreserve(&collection_details.owner, deposit.amount);
},
_ => (),
}
Collection::<T, I>::insert(collection, &collection_details);
Self::deposit_event(Event::AttributeCleared { collection, maybe_item, key, namespace });
Ok(())
}
/// Approves a delegate to set attributes on behalf of the item's owner.
///
/// This function allows the owner of an item to approve a delegate to set attributes in the
/// `Account(delegate)` namespace. The maximum number of approvals is determined by
/// the configuration `T::MaxAttributesApprovals`.
///
/// - `check_origin`: The account of the item's owner attempting to approve the delegate.
/// - `collection`: The identifier of the collection to which the item belongs.
/// - `item`: The identifier of the item for which the delegate is being approved.
/// - `delegate`: The account that is being approved to set attributes on behalf of the item's
/// owner.
pub(crate) fn do_approve_item_attributes(
check_origin: T::AccountId,
collection: T::CollectionId,
item: T::ItemId,
delegate: T::AccountId,
) -> DispatchResult {
ensure!(
Self::is_pallet_feature_enabled(PalletFeature::Attributes),
Error::<T, I>::MethodDisabled
);
let details = Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
ensure!(check_origin == details.owner, Error::<T, I>::NoPermission);
ItemAttributesApprovalsOf::<T, I>::try_mutate(collection, item, |approvals| {
approvals
.try_insert(delegate.clone())
.map_err(|_| Error::<T, I>::ReachedApprovalLimit)?;
Self::deposit_event(Event::ItemAttributesApprovalAdded { collection, item, delegate });
Ok(())
})
}
/// Cancels the approval of an item's attributes by a delegate.
///
/// This function allows the owner of an item to cancel the approval of a delegate to set
/// attributes in the `Account(delegate)` namespace. The delegate's approval is removed, in
/// addition to attributes the `delegate` previously created, and any unreserved deposit
/// is returned. The number of attributes that the delegate has set for the item must
/// not exceed the `account_attributes` provided in the `witness`.
/// This function is used to prevent unintended or malicious cancellations.
///
/// - `check_origin`: The account of the item's owner attempting to cancel the delegate's
/// approval.
/// - `collection`: The identifier of the collection to which the item belongs.
/// - `item`: The identifier of the item for which the delegate's approval is being canceled.
/// - `delegate`: The account whose approval is being canceled.
/// - `witness`: The witness containing the number of attributes set by the delegate for the
/// item.
pub(crate) fn do_cancel_item_attributes_approval(
check_origin: T::AccountId,
collection: T::CollectionId,
item: T::ItemId,
delegate: T::AccountId,
witness: CancelAttributesApprovalWitness,
) -> DispatchResult {
ensure!(
Self::is_pallet_feature_enabled(PalletFeature::Attributes),
Error::<T, I>::MethodDisabled
);
let details = Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
ensure!(check_origin == details.owner, Error::<T, I>::NoPermission);
ItemAttributesApprovalsOf::<T, I>::try_mutate(collection, item, |approvals| {
approvals.remove(&delegate);
let mut attributes: u32 = 0;
let mut deposited: DepositBalanceOf<T, I> = Zero::zero();
for (_, (_, deposit)) in Attribute::<T, I>::drain_prefix((
&collection,
Some(item),
AttributeNamespace::Account(delegate.clone()),
)) {
attributes.saturating_inc();
deposited = deposited.saturating_add(deposit.amount);
}
ensure!(attributes <= witness.account_attributes, Error::<T, I>::BadWitness);
if !deposited.is_zero() {
T::Currency::unreserve(&delegate, deposited);
}
Self::deposit_event(Event::ItemAttributesApprovalRemoved {
collection,
item,
delegate,
});
Ok(())
})
}
/// A helper method to check whether an attribute namespace is valid.
fn is_valid_namespace(
origin: &T::AccountId,
namespace: &AttributeNamespace<T::AccountId>,
collection: &T::CollectionId,
maybe_item: &Option<T::ItemId>,
) -> Result<bool, DispatchError> {
let mut result = false;
match namespace {
AttributeNamespace::CollectionOwner =>
result = Self::has_role(&collection, &origin, CollectionRole::Admin),
AttributeNamespace::ItemOwner =>
if let Some(item) = maybe_item {
let item_details =
Item::<T, I>::get(&collection, &item).ok_or(Error::<T, I>::UnknownItem)?;
result = origin == &item_details.owner
},
AttributeNamespace::Account(account_id) =>
if let Some(item) = maybe_item {
let approvals = ItemAttributesApprovalsOf::<T, I>::get(&collection, &item);
result = account_id == origin && approvals.contains(&origin)
},
_ => (),
};
Ok(result)
}
/// A helper method to construct an attribute's key.
///
/// # Errors
///
/// This function returns an [`IncorrectData`](crate::Error::IncorrectData) error if the
/// provided attribute `key` is too long.
pub fn construct_attribute_key(
key: Vec<u8>,
) -> Result<BoundedVec<u8, T::KeyLimit>, DispatchError> {
Ok(BoundedVec::try_from(key).map_err(|_| Error::<T, I>::IncorrectData)?)
}
/// A helper method to construct an attribute's value.
///
/// # Errors
///
/// This function returns an [`IncorrectData`](crate::Error::IncorrectData) error if the
/// provided `value` is too long.
pub fn construct_attribute_value(
value: Vec<u8>,
) -> Result<BoundedVec<u8, T::ValueLimit>, DispatchError> {
Ok(BoundedVec::try_from(value).map_err(|_| Error::<T, I>::IncorrectData)?)
}
/// A helper method to check whether a system attribute is set for a given item.
///
/// # Errors
///
/// This function returns an [`IncorrectData`](crate::Error::IncorrectData) error if the
/// provided pallet attribute is too long.
pub fn has_system_attribute(
collection: &T::CollectionId,
item: &T::ItemId,
attribute_key: PalletAttributes<T::CollectionId>,
) -> Result<bool, DispatchError> {
let attribute = (
&collection,
Some(item),
AttributeNamespace::Pallet,
&Self::construct_attribute_key(attribute_key.encode())?,
);
Ok(Attribute::<T, I>::contains_key(attribute))
}
}