git.delta.rocks / unique-network / refs/commits / 119e358551de

1#![cfg_attr(not(feature = "std"), no_std)]23/// For more guidance on Substrate FRAME, see the example pallet4/// https://github.com/paritytech/substrate/blob/master/frame/example/src/lib.rs5use codec::{Decode, Encode};6pub use frame_support::{7    construct_runtime, decl_event, decl_module, decl_storage,8    dispatch::DispatchResult,9    ensure, parameter_types,10    traits::{11        Currency, ExistenceRequirement, Get, Imbalance, KeyOwnerProofSystem, OnUnbalanced,12        Randomness, WithdrawReason,13    },14    weights::{15        constants::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, WEIGHT_PER_SECOND},16        DispatchInfo, GetDispatchInfo, IdentityFee, Pays, PostDispatchInfo, Weight,17        WeightToFeePolynomial,18    },19    IsSubType, StorageValue,20};2122use frame_system::{self as system, ensure_signed};23use sp_runtime::sp_std::prelude::Vec;24use sp_runtime::{25    traits::{26        DispatchInfoOf, Dispatchable, PostDispatchInfoOf, SaturatedConversion, Saturating,27        SignedExtension, Zero,28    },29    transaction_validity::{30        InvalidTransaction, TransactionPriority, TransactionValidity, TransactionValidityError,31        ValidTransaction,32    },33    FixedPointOperand, FixedU128,34};35use sp_std::prelude::*;3637#[cfg(test)]38mod mock;3940#[cfg(test)]41mod tests;4243#[derive(Encode, Decode, Debug, Eq, Clone, PartialEq)]44pub enum CollectionMode {45    Invalid,46    // custom data size47    NFT(u32),48    // decimal points49    Fungible(u32),50    // custom data size and decimal points51    ReFungible(u32, u32),52}5354impl Into<u8> for CollectionMode {55    fn into(self) -> u8 {56        match self {57            CollectionMode::Invalid => 0,58            CollectionMode::NFT(_) => 1,59            CollectionMode::Fungible(_) => 2,60            CollectionMode::ReFungible(_, _) => 3,61        }62    }63}6465#[derive(Encode, Decode, Debug, Clone, PartialEq)]66pub enum AccessMode {67    Normal,68    WhiteList,69}70impl Default for AccessMode {71    fn default() -> Self {72        Self::Normal73    }74}7576impl Default for CollectionMode {77    fn default() -> Self {78        Self::Invalid79    }80}8182#[derive(Encode, Decode, Default, Clone, PartialEq)]83#[cfg_attr(feature = "std", derive(Debug))]84pub struct Ownership<AccountId> {85    pub owner: AccountId,86    pub fraction: u128,87}8889#[derive(Encode, Decode, Default, Clone, PartialEq)]90#[cfg_attr(feature = "std", derive(Debug))]91pub struct CollectionType<AccountId> {92    pub owner: AccountId,93    pub mode: CollectionMode,94    pub access: AccessMode,95    pub decimal_points: u32,96    pub name: Vec<u16>,        // 64 include null escape char97    pub description: Vec<u16>, // 256 include null escape char98    pub token_prefix: Vec<u8>, // 16 include null escape char99    pub custom_data_size: u32,100    pub offchain_schema: Vec<u8>,101    pub sponsor: AccountId, // Who pays fees. If set to default address, the fees are applied to the transaction sender102    pub unconfirmed_sponsor: AccountId, // Sponsor address that has not yet confirmed sponsorship103}104105#[derive(Encode, Decode, Default, Clone, PartialEq)]106#[cfg_attr(feature = "std", derive(Debug))]107pub struct CollectionAdminsType<AccountId> {108    pub admin: AccountId,109    pub collection_id: u64,110}111112#[derive(Encode, Decode, Default, Clone, PartialEq)]113#[cfg_attr(feature = "std", derive(Debug))]114pub struct NftItemType<AccountId> {115    pub collection: u64,116    pub owner: AccountId,117    pub data: Vec<u8>,118}119120#[derive(Encode, Decode, Default, Clone, PartialEq)]121#[cfg_attr(feature = "std", derive(Debug))]122pub struct FungibleItemType<AccountId> {123    pub collection: u64,124    pub owner: AccountId,125    pub value: u128,126}127128#[derive(Encode, Decode, Default, Clone, PartialEq)]129#[cfg_attr(feature = "std", derive(Debug))]130pub struct ReFungibleItemType<AccountId> {131    pub collection: u64,132    pub owner: Vec<Ownership<AccountId>>,133    pub data: Vec<u8>,134}135136#[derive(Encode, Decode, Default, Clone, PartialEq)]137#[cfg_attr(feature = "std", derive(Debug))]138pub struct ApprovePermissions<AccountId> {139    pub approved: AccountId,140    pub amount: u64,141}142143#[derive(Encode, Decode, Default, Clone, PartialEq)]144#[cfg_attr(feature = "std", derive(Debug))]145pub struct VestingItem<AccountId, Moment> {146    pub sender: AccountId,147    pub recipient: AccountId,148    pub collection_id: u64,149    pub item_id: u64,150    pub amount: u64,151    pub vesting_date: Moment,152}153154pub trait Trait: system::Trait {155    type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;156}157158decl_storage! {159    trait Store for Module<T: Trait> as Nft {160161        // Private members162        NextCollectionID: u64;163        CreatedCollectionCount: u64;164        ChainVersion: u64;165        ItemListIndex: map hasher(blake2_128_concat) u64 => u64;166167        pub Collection get(fn collection): map hasher(identity) u64 => CollectionType<T::AccountId>;168        pub AdminList get(fn admin_list_collection): map hasher(identity) u64 => Vec<T::AccountId>;169        pub WhiteList get(fn white_list): map hasher(identity) u64 => Vec<T::AccountId>;170171        /// Balance owner per collection map172        pub Balance get(fn balance_count): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) T::AccountId => u64;173174        /// second parameter: item id + owner account id175        pub ApprovedList get(fn approved): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) (u64, T::AccountId) => Vec<ApprovePermissions<T::AccountId>>;176177        /// Item collections178        pub NftItemList get(fn nft_item_id): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => NftItemType<T::AccountId>;179        pub FungibleItemList get(fn fungible_item_id): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => FungibleItemType<T::AccountId>;180        pub ReFungibleItemList get(fn refungible_item_id): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => ReFungibleItemType<T::AccountId>;181182        // Active vesting list183        // pub VestingList get(fn vesting): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => VestingItem<T::AccountId, T::Moment>;184185        /// Index list186        pub AddressTokens get(fn address_tokens): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) T::AccountId => Vec<u64>;187188        // Sponsorship189        pub ContractSponsor get(fn contract_sponsor): map hasher(identity) T::AccountId => T::AccountId;190        pub UnconfirmedContractSponsor get(fn unconfirmed_contract_sponsor): map hasher(identity) T::AccountId => T::AccountId;191    }192}193194decl_event!(195    pub enum Event<T>196    where197        AccountId = <T as system::Trait>::AccountId,198    {199        Created(u64, u8, AccountId),200        ItemCreated(u64, u64),201        ItemDestroyed(u64, u64),202    }203);204205decl_module! {206    pub struct Module<T: Trait> for enum Call where origin: T::Origin {207208        fn deposit_event() = default;209210        fn on_initialize(now: T::BlockNumber) -> Weight {211212            if ChainVersion::get() < 2213            {214                let value = NextCollectionID::get();215                CreatedCollectionCount::put(value);216                ChainVersion::put(2);217            }218219            0220        }221222        // Create collection of NFT with given parameters223        //224        // @param customDataSz size of custom data in each collection item225        // returns collection ID226        #[weight = 0]227        pub fn create_collection(   origin,228                                    collection_name: Vec<u16>,229                                    collection_description: Vec<u16>,230                                    token_prefix: Vec<u8>,231                                    mode: CollectionMode) -> DispatchResult {232233            // Anyone can create a collection234            let who = ensure_signed(origin)?;235            let custom_data_size = match mode {236                CollectionMode::NFT(size) => size,237                CollectionMode::ReFungible(size, _) => size,238                _ => 0239            };240241            let decimal_points = match mode {242                CollectionMode::Fungible(points) => points,243                CollectionMode::ReFungible(_, points) => points,244                _ => 0245            };246247            // check params248            ensure!(decimal_points <= 4, "decimal_points parameter must be lower than 4");249250            let mut name = collection_name.to_vec();251            name.push(0);252            ensure!(name.len() <= 64, "Collection name can not be longer than 63 char");253254            let mut description = collection_description.to_vec();255            description.push(0);256            ensure!(name.len() <= 256, "Collection description can not be longer than 255 char");257258            let mut prefix = token_prefix.to_vec();259            prefix.push(0);260            ensure!(prefix.len() <= 16, "Token prefix can not be longer than 15 char");261262            // Generate next collection ID263            let next_id = NextCollectionID::get()264                .checked_add(1)265                .expect("collection id error");266267            NextCollectionID::put(next_id);268269            // Create new collection270            let new_collection = CollectionType {271                owner: who.clone(),272                name: name,273                mode: mode.clone(),274                access: AccessMode::Normal,275                description: description,276                decimal_points: decimal_points,277                token_prefix: prefix,278                offchain_schema: Vec::new(),279                custom_data_size: custom_data_size,280                sponsor: T::AccountId::default(),281                unconfirmed_sponsor: T::AccountId::default(),282            };283284            // Add new collection to map285            <Collection<T>>::insert(next_id, new_collection);286287            // call event288            Self::deposit_event(RawEvent::Created(next_id, mode.into(), who.clone()));289290            Ok(())291        }292293        #[weight = 0]294        pub fn destroy_collection(origin, collection_id: u64) -> DispatchResult {295296            let sender = ensure_signed(origin)?;297            Self::check_owner_permissions(collection_id, sender)?;298299            // TODO Items remove300            <AddressTokens<T>>::remove_prefix(collection_id);301            <ApprovedList<T>>::remove_prefix(collection_id);302            <Balance<T>>::remove_prefix(collection_id);303            <ItemListIndex>::remove(collection_id);304            <AdminList<T>>::remove(collection_id);305            <Collection<T>>::remove(collection_id);306            <WhiteList<T>>::remove(collection_id);307308            Ok(())309        }310311        #[weight = 0]312        pub fn change_collection_owner(origin, collection_id: u64, new_owner: T::AccountId) -> DispatchResult {313314            let sender = ensure_signed(origin)?;315            Self::check_owner_permissions(collection_id, sender)?;316            let mut target_collection = <Collection<T>>::get(collection_id);317            target_collection.owner = new_owner;318            <Collection<T>>::insert(collection_id, target_collection);319320            Ok(())321        }322323        #[weight = 0]324        pub fn add_collection_admin(origin, collection_id: u64, new_admin_id: T::AccountId) -> DispatchResult {325326            let sender = ensure_signed(origin)?;327            Self::check_owner_or_admin_permissions(collection_id, sender)?;328            let mut admin_arr: Vec<T::AccountId> = Vec::new();329330            if <AdminList<T>>::contains_key(collection_id)331            {332                admin_arr = <AdminList<T>>::get(collection_id);333                ensure!(!admin_arr.contains(&new_admin_id), "Account already has admin role");334            }335336            admin_arr.push(new_admin_id);337            <AdminList<T>>::insert(collection_id, admin_arr);338339            Ok(())340        }341342        #[weight = 0]343        pub fn remove_collection_admin(origin, collection_id: u64, account_id: T::AccountId) -> DispatchResult {344345            let sender = ensure_signed(origin)?;346            Self::check_owner_or_admin_permissions(collection_id, sender)?;347348            if <AdminList<T>>::contains_key(collection_id)349            {350                let mut admin_arr = <AdminList<T>>::get(collection_id);351                admin_arr.retain(|i| *i != account_id);352                <AdminList<T>>::insert(collection_id, admin_arr);353            }354355            Ok(())356        }357358        #[weight = 0]359        pub fn set_collection_sponsor(origin, collection_id: u64, new_sponsor: T::AccountId) -> DispatchResult {360361            let sender = ensure_signed(origin)?;362            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");363364            let mut target_collection = <Collection<T>>::get(collection_id);365            ensure!(sender == target_collection.owner, "You do not own this collection");366367            target_collection.unconfirmed_sponsor = new_sponsor;368            <Collection<T>>::insert(collection_id, target_collection);369370            Ok(())371        }372373        #[weight = 0]374        pub fn confirm_sponsorship(origin, collection_id: u64) -> DispatchResult {375376            let sender = ensure_signed(origin)?;377            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");378379            let mut target_collection = <Collection<T>>::get(collection_id);380            ensure!(sender == target_collection.unconfirmed_sponsor, "This address is not set as sponsor, use setCollectionSponsor first");381382            target_collection.sponsor = target_collection.unconfirmed_sponsor;383            target_collection.unconfirmed_sponsor = T::AccountId::default();384            <Collection<T>>::insert(collection_id, target_collection);385386            Ok(())387        }388389        #[weight = 0]390        pub fn remove_collection_sponsor(origin, collection_id: u64) -> DispatchResult {391392            let sender = ensure_signed(origin)?;393            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");394395            let mut target_collection = <Collection<T>>::get(collection_id);396            ensure!(sender == target_collection.owner, "You do not own this collection");397398            target_collection.sponsor = T::AccountId::default();399            <Collection<T>>::insert(collection_id, target_collection);400401            Ok(())402        }403404        #[weight = 0]405        pub fn create_item(origin, collection_id: u64, properties: Vec<u8>, owner: T::AccountId) -> DispatchResult {406407            let sender = ensure_signed(origin)?;408            let target_collection = <Collection<T>>::get(collection_id);409            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;410411            match target_collection.mode412            {413                CollectionMode::NFT(_) => {414415                    // check size416                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");417418                    // Create nft item419                    let item = NftItemType {420                        collection: collection_id,421                        owner: owner,422                        data: properties,423                    };424425                    Self::add_nft_item(item)?;426427                },428                CollectionMode::Fungible(_) => {429430                    // check size431                    ensure!(properties.len() as u32 == 0, "Size of item must be 0 with fungible type");432433                    let item = FungibleItemType {434                        collection: collection_id,435                        owner: owner,436                        value: (10 as u128).pow(target_collection.decimal_points)437                    };438439                    Self::add_fungible_item(item)?;440                },441                CollectionMode::ReFungible(_, _) => {442443                    // check size444                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");445446                    let mut owner_list = Vec::new();447                    let value = (10 as u128).pow(target_collection.decimal_points);448                    owner_list.push(Ownership {owner: owner, fraction: value});449450                    let item = ReFungibleItemType {451                        collection: collection_id,452                        owner: owner_list,453                        data: properties454                    };455456                    Self::add_refungible_item(item)?;457                },458                _ => ()459            };460461            // call event462            Self::deposit_event(RawEvent::ItemCreated(collection_id, <ItemListIndex>::get(collection_id)));463464            Ok(())465        }466467        #[weight = 0]468        pub fn burn_item(origin, collection_id: u64, item_id: u64) -> DispatchResult {469470            let sender = ensure_signed(origin)?;471            let item_owner = Self::is_item_owner(sender.clone(), collection_id, item_id);472            if !item_owner473            {474                Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;475            }476            let target_collection = <Collection<T>>::get(collection_id);477478            match target_collection.mode479            {480                CollectionMode::NFT(_) => Self::burn_nft_item(collection_id, item_id)?,481                CollectionMode::Fungible(_)  => Self::burn_fungible_item(collection_id, item_id)?,482                CollectionMode::ReFungible(_, _)  => Self::burn_refungible_item(collection_id, item_id, sender.clone())?,483                _ => ()484            };485486            // call event487            Self::deposit_event(RawEvent::ItemDestroyed(collection_id, item_id));488489            Ok(())490        }491492        #[weight = 0]493        pub fn transfer(origin, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64) -> DispatchResult {494495            let sender = ensure_signed(origin)?;496            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id), "Only item owner can call transfer method");497498            let target_collection = <Collection<T>>::get(collection_id);499500            // TODO: implement other modes501            match target_collection.mode502            {503                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, sender.clone(), recipient)?,504                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, sender.clone(), recipient)?,505                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, sender.clone(), recipient)?,506                _ => ()507            };508509            Ok(())510        }511512        #[weight = 0]513        pub fn approve(origin, approved: T::AccountId, collection_id: u64, item_id: u64) -> DispatchResult {514515            let sender = ensure_signed(origin)?;516517            // amount param stub518            let amount = 100000000;519520            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id), "Only item owner can call transfer method");521522            let list_exists = <ApprovedList<T>>::contains_key(collection_id, (item_id, sender.clone()));523            if list_exists {524525                let mut list = <ApprovedList<T>>::get(collection_id, (item_id, sender.clone()));526                let item_contains = list.iter().any(|i| i.approved == approved);527528                if !item_contains {529                    list.push(ApprovePermissions { approved: approved.clone(), amount: amount });530                    <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);531                }532            } else {533534                let mut list = Vec::new();535                list.push(ApprovePermissions { approved: approved.clone(), amount: amount });536                <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);537            }538539            Ok(())540        }541542        #[weight = 0]543        pub fn transfer_from(origin, from: T::AccountId, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64 ) -> DispatchResult {544545            let sender = ensure_signed(origin)?;546            let approved_list_exists = <ApprovedList<T>>::contains_key(collection_id, (item_id, from.clone()));547            if approved_list_exists548            {549                let list_itm = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()));550                let opt_item = list_itm.iter().find(|i| i.approved == sender.clone());551                ensure!(opt_item.is_some(), "No approve found");552                ensure!(opt_item.unwrap().amount >= value, "Requested value more than approved");553554                // remove approve555                let approve_list: Vec<ApprovePermissions<T::AccountId>> = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()))556                    .into_iter().filter(|i| i.approved != sender.clone()).collect();557                <ApprovedList<T>>::insert(collection_id, (item_id, from.clone()), approve_list);558            }559            else560            {561                Self::check_owner_or_admin_permissions(collection_id, sender)?;562            }563564            let target_collection = <Collection<T>>::get(collection_id);565566            match target_collection.mode567            {568                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, from, recipient)?,569                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, from.clone(), recipient)?,570                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, from.clone(), recipient)?,571                _ => ()572            };573574            Ok(())575        }576577        #[weight = 0]578        pub fn safe_transfer_from(origin, collection_id: u64, item_id: u64, new_owner: T::AccountId) -> DispatchResult {579580            // let no_perm_mes = "You do not have permissions to modify this collection";581            // ensure!(<ApprovedList<T>>::contains_key((collection_id, item_id)), no_perm_mes);582            // let list_itm = <ApprovedList<T>>::get((collection_id, item_id));583            // ensure!(list_itm.contains(&new_owner.clone()), no_perm_mes);584585            // // on_nft_received  call586587            // Self::transfer(origin, collection_id, item_id, new_owner)?;588589            Ok(())590        }591592        #[weight = 0]593        pub fn set_offchain_schema(594            origin,595            collection_id: u64,596            schema: Vec<u8>597        ) -> DispatchResult {598            let sender = ensure_signed(origin)?;599            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;600601            let mut target_collection = <Collection<T>>::get(collection_id);602            target_collection.offchain_schema = schema;603            <Collection<T>>::insert(collection_id, target_collection);604605            Ok(())606        }607    }608}609610impl<T: Trait> Module<T> {611    fn add_fungible_item(item: FungibleItemType<T::AccountId>) -> DispatchResult {612        let current_index = <ItemListIndex>::get(item.collection)613            .checked_add(1)614            .expect("Item list index id error");615        let itemcopy = item.clone();616        let owner = item.owner.clone();617        let value = item.value as u64;618619        Self::add_token_index(item.collection, current_index, owner.clone())?;620621        <ItemListIndex>::insert(item.collection, current_index);622        <FungibleItemList<T>>::insert(item.collection, current_index, itemcopy);623624        // Update balance625        let new_balance = <Balance<T>>::get(item.collection, owner.clone())626            .checked_add(value)627            .unwrap();628        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);629630        Ok(())631    }632633    fn add_refungible_item(item: ReFungibleItemType<T::AccountId>) -> DispatchResult {634        let current_index = <ItemListIndex>::get(item.collection)635            .checked_add(1)636            .expect("Item list index id error");637        let itemcopy = item.clone();638639        let value = item.owner.first().unwrap().fraction as u64;640        let owner = item.owner.first().unwrap().owner.clone();641642        Self::add_token_index(item.collection, current_index, owner.clone())?;643644        <ItemListIndex>::insert(item.collection, current_index);645        <ReFungibleItemList<T>>::insert(item.collection, current_index, itemcopy);646647        // Update balance648        let new_balance = <Balance<T>>::get(item.collection, owner.clone())649            .checked_add(value)650            .unwrap();651        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);652653        Ok(())654    }655656    fn add_nft_item(item: NftItemType<T::AccountId>) -> DispatchResult {657        let current_index = <ItemListIndex>::get(item.collection)658            .checked_add(1)659            .expect("Item list index id error");660661        let item_owner = item.owner.clone();662        let collection_id = item.collection.clone();663        Self::add_token_index(collection_id, current_index, item.owner.clone())?;664665        <ItemListIndex>::insert(collection_id, current_index);666        <NftItemList<T>>::insert(collection_id, current_index, item);667668        // Update balance669        let new_balance = <Balance<T>>::get(collection_id, item_owner.clone())670            .checked_add(1)671            .unwrap();672        <Balance<T>>::insert(collection_id, item_owner.clone(), new_balance);673674        Ok(())675    }676677    fn burn_refungible_item(678        collection_id: u64,679        item_id: u64,680        owner: T::AccountId,681    ) -> DispatchResult {682        ensure!(683            <ReFungibleItemList<T>>::contains_key(collection_id, item_id),684            "Item does not exists"685        );686        let collection = <ReFungibleItemList<T>>::get(collection_id, item_id);687        let item = collection688            .owner689            .iter()690            .filter(|&i| i.owner == owner)691            .next()692            .unwrap();693        Self::remove_token_index(collection_id, item_id, owner.clone())?;694695        // remove approve list696        <ApprovedList<T>>::remove(collection_id, (item_id, owner.clone()));697698        // update balance699        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())700            .checked_sub(item.fraction as u64)701            .unwrap();702        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);703704        <ReFungibleItemList<T>>::remove(collection_id, item_id);705706        Ok(())707    }708709    fn burn_nft_item(collection_id: u64, item_id: u64) -> DispatchResult {710        ensure!(711            <NftItemList<T>>::contains_key(collection_id, item_id),712            "Item does not exists"713        );714        let item = <NftItemList<T>>::get(collection_id, item_id);715        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;716717        // remove approve list718        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));719720        // update balance721        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())722            .checked_sub(1)723            .unwrap();724        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);725        <NftItemList<T>>::remove(collection_id, item_id);726727        Ok(())728    }729730    fn burn_fungible_item(collection_id: u64, item_id: u64) -> DispatchResult {731        ensure!(732            <FungibleItemList<T>>::contains_key(collection_id, item_id),733            "Item does not exists"734        );735        let item = <FungibleItemList<T>>::get(collection_id, item_id);736        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;737738        // remove approve list739        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));740741        // update balance742        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())743            .checked_sub(item.value as u64)744            .unwrap();745        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);746747        <FungibleItemList<T>>::remove(collection_id, item_id);748749        Ok(())750    }751752    fn collection_exists(collection_id: u64) -> DispatchResult {753        ensure!(754            <Collection<T>>::contains_key(collection_id),755            "This collection does not exist"756        );757        Ok(())758    }759760    fn check_owner_permissions(collection_id: u64, subject: T::AccountId) -> DispatchResult {761        Self::collection_exists(collection_id)?;762763        let target_collection = <Collection<T>>::get(collection_id);764        ensure!(765            subject == target_collection.owner,766            "You do not own this collection"767        );768769        Ok(())770    }771772    fn check_owner_or_admin_permissions(773        collection_id: u64,774        subject: T::AccountId,775    ) -> DispatchResult {776        Self::collection_exists(collection_id)?;777778        let target_collection = <Collection<T>>::get(collection_id);779        let is_owner = subject == target_collection.owner;780781        let no_perm_mes = "You do not have permissions to modify this collection";782        let exists = <AdminList<T>>::contains_key(collection_id);783784        if !is_owner {785            ensure!(exists, no_perm_mes);786            ensure!(787                <AdminList<T>>::get(collection_id).contains(&subject),788                no_perm_mes789            );790        }791        Ok(())792    }793794    fn is_item_owner(subject: T::AccountId, collection_id: u64, item_id: u64) -> bool {795        let target_collection = <Collection<T>>::get(collection_id);796797        match target_collection.mode {798            CollectionMode::NFT(_) => {799                <NftItemList<T>>::get(collection_id, item_id).owner == subject800            }801            CollectionMode::Fungible(_) => {802                <FungibleItemList<T>>::get(collection_id, item_id).owner == subject803            }804            CollectionMode::ReFungible(_, _) => {805                <ReFungibleItemList<T>>::get(collection_id, item_id)806                    .owner807                    .iter()808                    .any(|i| i.owner == subject)809            }810            CollectionMode::Invalid => false,811        }812    }813814    fn transfer_fungible(815        collection_id: u64,816        item_id: u64,817        value: u64,818        owner: T::AccountId,819        new_owner: T::AccountId,820    ) -> DispatchResult {821        let full_item = <FungibleItemList<T>>::get(collection_id, item_id);822        let amount = full_item.value;823824        ensure!(amount >= value.into(), "Item balance not enouth");825826        // update balance827        let balance_old_owner = <Balance<T>>::get(collection_id, owner.clone())828            .checked_sub(value)829            .unwrap();830        <Balance<T>>::insert(collection_id, owner.clone(), balance_old_owner);831832        let mut new_owner_account_id = 0;833        let new_owner_items = <AddressTokens<T>>::get(collection_id, new_owner.clone());834        if new_owner_items.len() > 0 {835            new_owner_account_id = new_owner_items[0];836        }837838        let val64 = value.into();839840        // transfer841        if amount == val64 && new_owner_account_id == 0 {842            // change owner843            // new owner do not have account844            let mut new_full_item = full_item.clone();845            new_full_item.owner = new_owner.clone();846            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);847848            // update balance849            let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())850                .checked_add(value)851                .unwrap();852            <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);853854            // update index collection855            Self::move_token_index(collection_id, item_id, owner.clone(), new_owner.clone())?;856        } else {857            let mut new_full_item = full_item.clone();858            new_full_item.value -= val64;859860            // separate amount861            if new_owner_account_id > 0 {862                // new owner has account863                let mut item = <FungibleItemList<T>>::get(collection_id, new_owner_account_id);864                item.value += val64;865866                // update balance867                let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())868                    .checked_add(value)869                    .unwrap();870                <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);871872                <FungibleItemList<T>>::insert(collection_id, new_owner_account_id, item);873            } else {874                // new owner do not have account875                let item = FungibleItemType {876                    collection: collection_id,877                    owner: new_owner.clone(),878                    value: val64,879                };880881                Self::add_fungible_item(item)?;882            }883884            if amount == val64 {885                Self::remove_token_index(collection_id, item_id, full_item.owner.clone())?;886887                // remove approve list888                <ApprovedList<T>>::remove(collection_id, (item_id, full_item.owner.clone()));889                <FungibleItemList<T>>::remove(collection_id, item_id);890            }891892            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);893        }894895        Ok(())896    }897898    fn transfer_refungible(899        collection_id: u64,900        item_id: u64,901        value: u64,902        owner: T::AccountId,903        new_owner: T::AccountId,904    ) -> DispatchResult {905        let full_item = <ReFungibleItemList<T>>::get(collection_id, item_id);906        let item = full_item907            .owner908            .iter()909            .filter(|i| i.owner == owner)910            .next()911            .unwrap();912        let amount = item.fraction;913914        ensure!(amount >= value.into(), "Item balance not enouth");915916        // update balance917        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())918            .checked_sub(value)919            .unwrap();920        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);921922        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())923            .checked_add(value)924            .unwrap();925        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);926927        let old_owner = item.owner.clone();928        let new_owner_has_account = full_item.owner.iter().any(|i| i.owner == new_owner);929        let val64 = value.into();930931        // transfer932        if amount == val64 && !new_owner_has_account {933            // change owner934            // new owner do not have account935            let mut new_full_item = full_item.clone();936            new_full_item937                .owner938                .iter_mut()939                .find(|i| i.owner == owner)940                .unwrap()941                .owner = new_owner.clone();942            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);943944            // update index collection945            Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;946        } else {947            let mut new_full_item = full_item.clone();948            new_full_item949                .owner950                .iter_mut()951                .find(|i| i.owner == owner)952                .unwrap()953                .fraction -= val64;954955            // separate amount956            if new_owner_has_account {957                // new owner has account958                new_full_item959                    .owner960                    .iter_mut()961                    .find(|i| i.owner == new_owner)962                    .unwrap()963                    .fraction += val64;964            } else {965                // new owner do not have account966                new_full_item.owner.push(Ownership {967                    owner: new_owner.clone(),968                    fraction: val64,969                });970                Self::add_token_index(collection_id, item_id, new_owner.clone())?;971            }972973            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);974        }975976        Ok(())977    }978979    fn transfer_nft(980        collection_id: u64,981        item_id: u64,982        sender: T::AccountId,983        new_owner: T::AccountId,984    ) -> DispatchResult {985        let mut item = <NftItemList<T>>::get(collection_id, item_id);986987        ensure!(988            sender == item.owner,989            "sender parameter and item owner must be equal"990        );991992        // update balance993        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())994            .checked_sub(1)995            .unwrap();996        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);997998        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())999            .checked_add(1)1000            .unwrap();1001        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);10021003        // change owner1004        let old_owner = item.owner.clone();1005        item.owner = new_owner.clone();1006        <NftItemList<T>>::insert(collection_id, item_id, item);10071008        // update index collection1009        Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;10101011        // reset approved list1012        <ApprovedList<T>>::remove(collection_id, (item_id, old_owner));1013        Ok(())1014    }10151016    fn add_token_index(collection_id: u64, item_index: u64, owner: T::AccountId) -> DispatchResult {1017        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1018        if list_exists {1019            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1020            let item_contains = list.contains(&item_index.clone());10211022            if !item_contains {1023                list.push(item_index.clone());1024            }10251026            <AddressTokens<T>>::insert(collection_id, owner.clone(), list);1027        } else {1028            let mut itm = Vec::new();1029            itm.push(item_index.clone());1030            <AddressTokens<T>>::insert(collection_id, owner, itm);1031        }10321033        Ok(())1034    }10351036    fn remove_token_index(1037        collection_id: u64,1038        item_index: u64,1039        owner: T::AccountId,1040    ) -> DispatchResult {1041        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1042        if list_exists {1043            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1044            let item_contains = list.contains(&item_index.clone());10451046            if item_contains {1047                list.retain(|&item| item != item_index);1048                <AddressTokens<T>>::insert(collection_id, owner, list);1049            }1050        }10511052        Ok(())1053    }10541055    fn move_token_index(1056        collection_id: u64,1057        item_index: u64,1058        old_owner: T::AccountId,1059        new_owner: T::AccountId,1060    ) -> DispatchResult {1061        Self::remove_token_index(collection_id, item_index, old_owner)?;1062        Self::add_token_index(collection_id, item_index, new_owner)?;10631064        Ok(())1065    }1066}10671068////////////////////////////////////////////////////////////////////////////////////////////////////1069// Economic models10701071/// Fee multiplier.1072pub type Multiplier = FixedU128;10731074type BalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1075    <T as system::Trait>::AccountId,1076>>::Balance;1077type NegativeImbalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1078    <T as system::Trait>::AccountId,1079>>::NegativeImbalance;10801081/// Require the transactor pay for themselves and maybe include a tip to gain additional priority1082/// in the queue.1083#[derive(Encode, Decode, Clone, Eq, PartialEq)]1084pub struct ChargeTransactionPayment<T: transaction_payment::Trait + Send + Sync>(1085    #[codec(compact)] BalanceOf<T>,1086);10871088impl<T: Trait + transaction_payment::Trait + Send + Sync> sp_std::fmt::Debug1089    for ChargeTransactionPayment<T>1090{1091    #[cfg(feature = "std")]1092    fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1093        write!(f, "ChargeTransactionPayment<{:?}>", self.0)1094    }1095    #[cfg(not(feature = "std"))]1096    fn fmt(&self, _: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1097        Ok(())1098    }1099}11001101impl<T: Trait + transaction_payment::Trait + Send + Sync> ChargeTransactionPayment<T>1102where1103    T::Call:1104        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1105    BalanceOf<T>: Send + Sync + FixedPointOperand,1106{1107    /// utility constructor. Used only in client/factory code.1108    pub fn from(fee: BalanceOf<T>) -> Self {1109        Self(fee)1110    }11111112    pub fn traditional_fee(1113        len: usize,1114        info: &DispatchInfoOf<T::Call>,1115        tip: BalanceOf<T>,1116    ) -> BalanceOf<T>1117    where1118        T::Call: Dispatchable<Info = DispatchInfo>,1119    {1120        <transaction_payment::Module<T>>::compute_fee(len as u32, info, tip)1121    }11221123    fn withdraw_fee(1124        &self,1125        who: &T::AccountId,1126        call: &T::Call,1127        info: &DispatchInfoOf<T::Call>,1128        len: usize,1129    ) -> Result<(BalanceOf<T>, Option<NegativeImbalanceOf<T>>), TransactionValidityError> {1130        let tip = self.0;11311132        // Set fee based on call type. Creating collection costs 1 Unique.1133        // All other transactions have traditional fees so far1134        let fee = match call.is_sub_type() {1135            Some(Call::create_collection(..)) => <BalanceOf<T>>::from(1_000_000_000),1136            _ => Self::traditional_fee(len, info, tip), // Flat fee model, use only for testing purposes1137                                                        // _ => <BalanceOf<T>>::from(100)1138        };11391140        // Determine who is paying transaction fee based on ecnomic model1141        // Parse call to extract collection ID and access collection sponsor1142        let sponsor: T::AccountId = match call.is_sub_type() {1143            Some(Call::create_item(collection_id, _properties, _owner)) => {1144                <Collection<T>>::get(collection_id).sponsor1145            }1146            Some(Call::transfer(_new_owner, collection_id, _item_id, _value)) => {1147                <Collection<T>>::get(collection_id).sponsor1148            }11491150            _ => T::AccountId::default(),1151        };11521153        let mut who_pays_fee: T::AccountId = sponsor.clone();1154        if sponsor == T::AccountId::default() {1155            who_pays_fee = who.clone();1156        }11571158        // Only mess with balances if fee is not zero.1159        if fee.is_zero() {1160            return Ok((fee, None));1161        }11621163        match <T as transaction_payment::Trait>::Currency::withdraw(1164            &who_pays_fee,1165            fee,1166            if tip.is_zero() {1167                WithdrawReason::TransactionPayment.into()1168            } else {1169                WithdrawReason::TransactionPayment | WithdrawReason::Tip1170            },1171            ExistenceRequirement::KeepAlive,1172        ) {1173            Ok(imbalance) => Ok((fee, Some(imbalance))),1174            Err(_) => Err(InvalidTransaction::Payment.into()),1175        }1176    }1177}11781179impl<T: Trait + transaction_payment::Trait + Send + Sync> SignedExtension1180    for ChargeTransactionPayment<T>1181where1182    BalanceOf<T>: Send + Sync + From<u64> + FixedPointOperand,1183    T::Call:1184        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1185{1186    const IDENTIFIER: &'static str = "ChargeTransactionPayment";1187    type AccountId = T::AccountId;1188    type Call = T::Call;1189    type AdditionalSigned = ();1190    type Pre = (1191        BalanceOf<T>,1192        Self::AccountId,1193        Option<NegativeImbalanceOf<T>>,1194        BalanceOf<T>,1195    );1196    fn additional_signed(&self) -> sp_std::result::Result<(), TransactionValidityError> {1197        Ok(())1198    }11991200    fn validate(1201        &self,1202        who: &Self::AccountId,1203        call: &Self::Call,1204        info: &DispatchInfoOf<Self::Call>,1205        len: usize,1206    ) -> TransactionValidity {1207        let (fee, _) = self.withdraw_fee(who, call, info, len)?;12081209        let mut r = ValidTransaction::default();1210        // NOTE: we probably want to maximize the _fee (of any type) per weight unit_ here, which1211        // will be a bit more than setting the priority to tip. For now, this is enough.1212        r.priority = fee.saturated_into::<TransactionPriority>();1213        Ok(r)1214    }12151216    fn pre_dispatch(1217        self,1218        who: &Self::AccountId,1219        call: &Self::Call,1220        info: &DispatchInfoOf<Self::Call>,1221        len: usize,1222    ) -> Result<Self::Pre, TransactionValidityError> {1223        let (fee, imbalance) = self.withdraw_fee(who, call, info, len)?;1224        Ok((self.0, who.clone(), imbalance, fee))1225    }12261227    fn post_dispatch(1228        pre: Self::Pre,1229        info: &DispatchInfoOf<Self::Call>,1230        post_info: &PostDispatchInfoOf<Self::Call>,1231        len: usize,1232        _result: &DispatchResult,1233    ) -> Result<(), TransactionValidityError> {1234        let (tip, who, imbalance, fee) = pre;1235        if let Some(payed) = imbalance {1236            let actual_fee = <transaction_payment::Module<T>>::compute_actual_fee(1237                len as u32, info, post_info, tip,1238            );1239            let refund = fee.saturating_sub(actual_fee);1240            let actual_payment =1241                match <T as transaction_payment::Trait>::Currency::deposit_into_existing(1242                    &who, refund,1243                ) {1244                    Ok(refund_imbalance) => {1245                        // The refund cannot be larger than the up front payed max weight.1246                        // `PostDispatchInfo::calc_unspent` guards against such a case.1247                        match payed.offset(refund_imbalance) {1248                            Ok(actual_payment) => actual_payment,1249                            Err(_) => return Err(InvalidTransaction::Payment.into()),1250                        }1251                    }1252                    // We do not recreate the account using the refund. The up front payment1253                    // is gone in that case.1254                    Err(_) => payed,1255                };1256            let imbalances = actual_payment.split(tip);1257            <T as transaction_payment::Trait>::OnTransactionPayment::on_unbalanceds(1258                Some(imbalances.0).into_iter().chain(Some(imbalances.1)),1259            );1260        }1261        Ok(())1262    }1263}