git.delta.rocks / unique-network / refs/commits / f94b085b2397

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() == 0213            {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 = CreatedCollectionCount::get()264                .checked_add(1)265                .expect("collection id error");266267            CreatedCollectionCount::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.clone(),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.clone(), fraction: value});449450                    let item = ReFungibleItemType {451                        collection: collection_id,452                        owner: owner_list,453                        data: properties.clone()454                    };455456                    Self::add_refungible_item(item)?;457                },458                _ => { ensure!(1 == 0,"just error"); }459460            };461462            // call event463            Self::deposit_event(RawEvent::ItemCreated(collection_id, <ItemListIndex>::get(collection_id)));464465            Ok(())466        }467468        #[weight = 0]469        pub fn burn_item(origin, collection_id: u64, item_id: u64) -> DispatchResult {470471            let sender = ensure_signed(origin)?;472            let item_owner = Self::is_item_owner(sender.clone(), collection_id, item_id);473            if !item_owner474            {475                Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;476            }477            let target_collection = <Collection<T>>::get(collection_id);478479            match target_collection.mode480            {481                CollectionMode::NFT(_) => Self::burn_nft_item(collection_id, item_id)?,482                CollectionMode::Fungible(_)  => Self::burn_fungible_item(collection_id, item_id)?,483                CollectionMode::ReFungible(_, _)  => Self::burn_refungible_item(collection_id, item_id, sender.clone())?,484                _ => ()485            };486487            // call event488            Self::deposit_event(RawEvent::ItemDestroyed(collection_id, item_id));489490            Ok(())491        }492493        #[weight = 0]494        pub fn transfer(origin, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64) -> DispatchResult {495496            let sender = ensure_signed(origin)?;497            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id), "Only item owner can call transfer method");498499            let target_collection = <Collection<T>>::get(collection_id);500501            // TODO: implement other modes502            match target_collection.mode503            {504                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, sender.clone(), recipient)?,505                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, sender.clone(), recipient)?,506                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, sender.clone(), recipient)?,507                _ => ()508            };509510            Ok(())511        }512513        #[weight = 0]514        pub fn approve(origin, approved: T::AccountId, collection_id: u64, item_id: u64) -> DispatchResult {515516            let sender = ensure_signed(origin)?;517518            // amount param stub519            let amount = 100000000;520521            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id), "Only item owner can call transfer method");522523            let list_exists = <ApprovedList<T>>::contains_key(collection_id, (item_id, sender.clone()));524            if list_exists {525526                let mut list = <ApprovedList<T>>::get(collection_id, (item_id, sender.clone()));527                let item_contains = list.iter().any(|i| i.approved == approved);528529                if !item_contains {530                    list.push(ApprovePermissions { approved: approved.clone(), amount: amount });531                    <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);532                }533            } else {534535                let mut list = Vec::new();536                list.push(ApprovePermissions { approved: approved.clone(), amount: amount });537                <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);538            }539540            Ok(())541        }542543        #[weight = 0]544        pub fn transfer_from(origin, from: T::AccountId, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64 ) -> DispatchResult {545546            let sender = ensure_signed(origin)?;547            let approved_list_exists = <ApprovedList<T>>::contains_key(collection_id, (item_id, from.clone()));548            if approved_list_exists549            {550                let list_itm = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()));551                let opt_item = list_itm.iter().find(|i| i.approved == sender.clone());552                ensure!(opt_item.is_some(), "No approve found");553                ensure!(opt_item.unwrap().amount >= value, "Requested value more than approved");554555                // remove approve556                let approve_list: Vec<ApprovePermissions<T::AccountId>> = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()))557                    .into_iter().filter(|i| i.approved != sender.clone()).collect();558                <ApprovedList<T>>::insert(collection_id, (item_id, from.clone()), approve_list);559            }560            else561            {562                Self::check_owner_or_admin_permissions(collection_id, sender)?;563            }564565            let target_collection = <Collection<T>>::get(collection_id);566567            match target_collection.mode568            {569                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, from, recipient)?,570                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, from.clone(), recipient)?,571                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, from.clone(), recipient)?,572                _ => ()573            };574575            Ok(())576        }577578        #[weight = 0]579        pub fn safe_transfer_from(origin, collection_id: u64, item_id: u64, new_owner: T::AccountId) -> DispatchResult {580581            // let no_perm_mes = "You do not have permissions to modify this collection";582            // ensure!(<ApprovedList<T>>::contains_key((collection_id, item_id)), no_perm_mes);583            // let list_itm = <ApprovedList<T>>::get((collection_id, item_id));584            // ensure!(list_itm.contains(&new_owner.clone()), no_perm_mes);585586            // // on_nft_received  call587588            // Self::transfer(origin, collection_id, item_id, new_owner)?;589590            Ok(())591        }592593        #[weight = 0]594        pub fn set_offchain_schema(595            origin,596            collection_id: u64,597            schema: Vec<u8>598        ) -> DispatchResult {599            let sender = ensure_signed(origin)?;600            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;601602            let mut target_collection = <Collection<T>>::get(collection_id);603            target_collection.offchain_schema = schema;604            <Collection<T>>::insert(collection_id, target_collection);605606            Ok(())607        }608    }609}610611impl<T: Trait> Module<T> {612    fn add_fungible_item(item: FungibleItemType<T::AccountId>) -> DispatchResult {613        let current_index = <ItemListIndex>::get(item.collection)614            .checked_add(1)615            .expect("Item list index id error");616        let itemcopy = item.clone();617        let owner = item.owner.clone();618        let value = item.value as u64;619620        Self::add_token_index(item.collection, current_index, owner.clone())?;621622        <ItemListIndex>::insert(item.collection, current_index);623        <FungibleItemList<T>>::insert(item.collection, current_index, itemcopy);624625        // Update balance626        let new_balance = <Balance<T>>::get(item.collection, owner.clone())627            .checked_add(value)628            .unwrap();629        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);630631        Ok(())632    }633634    fn add_refungible_item(item: ReFungibleItemType<T::AccountId>) -> DispatchResult {635        let current_index = <ItemListIndex>::get(item.collection)636            .checked_add(1)637            .expect("Item list index id error");638        let itemcopy = item.clone();639640        let value = item.owner.first().unwrap().fraction as u64;641        let owner = item.owner.first().unwrap().owner.clone();642643        Self::add_token_index(item.collection, current_index, owner.clone())?;644645        <ItemListIndex>::insert(item.collection, current_index);646        <ReFungibleItemList<T>>::insert(item.collection, current_index, itemcopy);647648        // Update balance649        let new_balance = <Balance<T>>::get(item.collection, owner.clone())650            .checked_add(value)651            .unwrap();652        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);653654        Ok(())655    }656657    fn add_nft_item(item: NftItemType<T::AccountId>) -> DispatchResult {658        let current_index = <ItemListIndex>::get(item.collection)659            .checked_add(1)660            .expect("Item list index id error");661662        let item_owner = item.owner.clone();663        let collection_id = item.collection.clone();664        Self::add_token_index(collection_id, current_index, item.owner.clone())?;665666        <ItemListIndex>::insert(collection_id, current_index);667        <NftItemList<T>>::insert(collection_id, current_index, item);668669        // Update balance670        let new_balance = <Balance<T>>::get(collection_id, item_owner.clone())671            .checked_add(1)672            .unwrap();673        <Balance<T>>::insert(collection_id, item_owner.clone(), new_balance);674675        Ok(())676    }677678    fn burn_refungible_item(679        collection_id: u64,680        item_id: u64,681        owner: T::AccountId,682    ) -> DispatchResult {683        ensure!(684            <ReFungibleItemList<T>>::contains_key(collection_id, item_id),685            "Item does not exists"686        );687        let collection = <ReFungibleItemList<T>>::get(collection_id, item_id);688        let item = collection689            .owner690            .iter()691            .filter(|&i| i.owner == owner)692            .next()693            .unwrap();694        Self::remove_token_index(collection_id, item_id, owner.clone())?;695696        // remove approve list697        <ApprovedList<T>>::remove(collection_id, (item_id, owner.clone()));698699        // update balance700        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())701            .checked_sub(item.fraction as u64)702            .unwrap();703        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);704705        <ReFungibleItemList<T>>::remove(collection_id, item_id);706707        Ok(())708    }709710    fn burn_nft_item(collection_id: u64, item_id: u64) -> DispatchResult {711        ensure!(712            <NftItemList<T>>::contains_key(collection_id, item_id),713            "Item does not exists"714        );715        let item = <NftItemList<T>>::get(collection_id, item_id);716        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;717718        // remove approve list719        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));720721        // update balance722        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())723            .checked_sub(1)724            .unwrap();725        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);726        <NftItemList<T>>::remove(collection_id, item_id);727728        Ok(())729    }730731    fn burn_fungible_item(collection_id: u64, item_id: u64) -> DispatchResult {732        ensure!(733            <FungibleItemList<T>>::contains_key(collection_id, item_id),734            "Item does not exists"735        );736        let item = <FungibleItemList<T>>::get(collection_id, item_id);737        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;738739        // remove approve list740        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));741742        // update balance743        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())744            .checked_sub(item.value as u64)745            .unwrap();746        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);747748        <FungibleItemList<T>>::remove(collection_id, item_id);749750        Ok(())751    }752753    fn collection_exists(collection_id: u64) -> DispatchResult {754        ensure!(755            <Collection<T>>::contains_key(collection_id),756            "This collection does not exist"757        );758        Ok(())759    }760761    fn check_owner_permissions(collection_id: u64, subject: T::AccountId) -> DispatchResult {762        Self::collection_exists(collection_id)?;763764        let target_collection = <Collection<T>>::get(collection_id);765        ensure!(766            subject == target_collection.owner,767            "You do not own this collection"768        );769770        Ok(())771    }772773    fn check_owner_or_admin_permissions(774        collection_id: u64,775        subject: T::AccountId,776    ) -> DispatchResult {777        Self::collection_exists(collection_id)?;778779        let target_collection = <Collection<T>>::get(collection_id);780        let is_owner = subject == target_collection.owner;781782        let no_perm_mes = "You do not have permissions to modify this collection";783        let exists = <AdminList<T>>::contains_key(collection_id);784785        if !is_owner {786            ensure!(exists, no_perm_mes);787            ensure!(788                <AdminList<T>>::get(collection_id).contains(&subject),789                no_perm_mes790            );791        }792        Ok(())793    }794795    fn is_item_owner(subject: T::AccountId, collection_id: u64, item_id: u64) -> bool {796        let target_collection = <Collection<T>>::get(collection_id);797798        match target_collection.mode {799            CollectionMode::NFT(_) => {800                <NftItemList<T>>::get(collection_id, item_id).owner == subject801            }802            CollectionMode::Fungible(_) => {803                <FungibleItemList<T>>::get(collection_id, item_id).owner == subject804            }805            CollectionMode::ReFungible(_, _) => {806                <ReFungibleItemList<T>>::get(collection_id, item_id)807                    .owner808                    .iter()809                    .any(|i| i.owner == subject)810            }811            CollectionMode::Invalid => false,812        }813    }814815    fn transfer_fungible(816        collection_id: u64,817        item_id: u64,818        value: u64,819        owner: T::AccountId,820        new_owner: T::AccountId,821    ) -> DispatchResult {822        let full_item = <FungibleItemList<T>>::get(collection_id, item_id);823        let amount = full_item.value;824825        ensure!(amount >= value.into(), "Item balance not enouth");826827        // update balance828        let balance_old_owner = <Balance<T>>::get(collection_id, owner.clone())829            .checked_sub(value)830            .unwrap();831        <Balance<T>>::insert(collection_id, owner.clone(), balance_old_owner);832833        let mut new_owner_account_id = 0;834        let new_owner_items = <AddressTokens<T>>::get(collection_id, new_owner.clone());835        if new_owner_items.len() > 0 {836            new_owner_account_id = new_owner_items[0];837        }838839        let val64 = value.into();840841        // transfer842        if amount == val64 && new_owner_account_id == 0 {843            // change owner844            // new owner do not have account845            let mut new_full_item = full_item.clone();846            new_full_item.owner = new_owner.clone();847            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);848849            // update balance850            let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())851                .checked_add(value)852                .unwrap();853            <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);854855            // update index collection856            Self::move_token_index(collection_id, item_id, owner.clone(), new_owner.clone())?;857        } else {858            let mut new_full_item = full_item.clone();859            new_full_item.value -= val64;860861            // separate amount862            if new_owner_account_id > 0 {863                // new owner has account864                let mut item = <FungibleItemList<T>>::get(collection_id, new_owner_account_id);865                item.value += val64;866867                // update balance868                let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())869                    .checked_add(value)870                    .unwrap();871                <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);872873                <FungibleItemList<T>>::insert(collection_id, new_owner_account_id, item);874            } else {875                // new owner do not have account876                let item = FungibleItemType {877                    collection: collection_id,878                    owner: new_owner.clone(),879                    value: val64,880                };881882                Self::add_fungible_item(item)?;883            }884885            if amount == val64 {886                Self::remove_token_index(collection_id, item_id, full_item.owner.clone())?;887888                // remove approve list889                <ApprovedList<T>>::remove(collection_id, (item_id, full_item.owner.clone()));890                <FungibleItemList<T>>::remove(collection_id, item_id);891            }892893            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);894        }895896        Ok(())897    }898899    fn transfer_refungible(900        collection_id: u64,901        item_id: u64,902        value: u64,903        owner: T::AccountId,904        new_owner: T::AccountId,905    ) -> DispatchResult {906        let full_item = <ReFungibleItemList<T>>::get(collection_id, item_id);907        let item = full_item908            .owner909            .iter()910            .filter(|i| i.owner == owner)911            .next()912            .unwrap();913        let amount = item.fraction;914915        ensure!(amount >= value.into(), "Item balance not enouth");916917        // update balance918        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())919            .checked_sub(value)920            .unwrap();921        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);922923        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())924            .checked_add(value)925            .unwrap();926        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);927928        let old_owner = item.owner.clone();929        let new_owner_has_account = full_item.owner.iter().any(|i| i.owner == new_owner);930        let val64 = value.into();931932        // transfer933        if amount == val64 && !new_owner_has_account {934            // change owner935            // new owner do not have account936            let mut new_full_item = full_item.clone();937            new_full_item938                .owner939                .iter_mut()940                .find(|i| i.owner == owner)941                .unwrap()942                .owner = new_owner.clone();943            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);944945            // update index collection946            Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;947        } else {948            let mut new_full_item = full_item.clone();949            new_full_item950                .owner951                .iter_mut()952                .find(|i| i.owner == owner)953                .unwrap()954                .fraction -= val64;955956            // separate amount957            if new_owner_has_account {958                // new owner has account959                new_full_item960                    .owner961                    .iter_mut()962                    .find(|i| i.owner == new_owner)963                    .unwrap()964                    .fraction += val64;965            } else {966                // new owner do not have account967                new_full_item.owner.push(Ownership {968                    owner: new_owner.clone(),969                    fraction: val64,970                });971                Self::add_token_index(collection_id, item_id, new_owner.clone())?;972            }973974            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);975        }976977        Ok(())978    }979980    fn transfer_nft(981        collection_id: u64,982        item_id: u64,983        sender: T::AccountId,984        new_owner: T::AccountId,985    ) -> DispatchResult {986        let mut item = <NftItemList<T>>::get(collection_id, item_id);987988        ensure!(989            sender == item.owner,990            "sender parameter and item owner must be equal"991        );992993        // update balance994        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())995            .checked_sub(1)996            .unwrap();997        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);998999        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())1000            .checked_add(1)1001            .unwrap();1002        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);10031004        // change owner1005        let old_owner = item.owner.clone();1006        item.owner = new_owner.clone();1007        <NftItemList<T>>::insert(collection_id, item_id, item);10081009        // update index collection1010        Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;10111012        // reset approved list1013        <ApprovedList<T>>::remove(collection_id, (item_id, old_owner));1014        Ok(())1015    }10161017    fn add_token_index(collection_id: u64, item_index: u64, owner: T::AccountId) -> DispatchResult {1018        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1019        if list_exists {1020            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1021            let item_contains = list.contains(&item_index.clone());10221023            if !item_contains {1024                list.push(item_index.clone());1025            }10261027            <AddressTokens<T>>::insert(collection_id, owner.clone(), list);1028        } else {1029            let mut itm = Vec::new();1030            itm.push(item_index.clone());1031            <AddressTokens<T>>::insert(collection_id, owner, itm);1032        }10331034        Ok(())1035    }10361037    fn remove_token_index(1038        collection_id: u64,1039        item_index: u64,1040        owner: T::AccountId,1041    ) -> DispatchResult {1042        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1043        if list_exists {1044            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1045            let item_contains = list.contains(&item_index.clone());10461047            if item_contains {1048                list.retain(|&item| item != item_index);1049                <AddressTokens<T>>::insert(collection_id, owner, list);1050            }1051        }10521053        Ok(())1054    }10551056    fn move_token_index(1057        collection_id: u64,1058        item_index: u64,1059        old_owner: T::AccountId,1060        new_owner: T::AccountId,1061    ) -> DispatchResult {1062        Self::remove_token_index(collection_id, item_index, old_owner)?;1063        Self::add_token_index(collection_id, item_index, new_owner)?;10641065        Ok(())1066    }1067}10681069////////////////////////////////////////////////////////////////////////////////////////////////////1070// Economic models10711072/// Fee multiplier.1073pub type Multiplier = FixedU128;10741075type BalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1076    <T as system::Trait>::AccountId,1077>>::Balance;1078type NegativeImbalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1079    <T as system::Trait>::AccountId,1080>>::NegativeImbalance;10811082/// Require the transactor pay for themselves and maybe include a tip to gain additional priority1083/// in the queue.1084#[derive(Encode, Decode, Clone, Eq, PartialEq)]1085pub struct ChargeTransactionPayment<T: transaction_payment::Trait + Send + Sync>(1086    #[codec(compact)] BalanceOf<T>,1087);10881089impl<T: Trait + transaction_payment::Trait + Send + Sync> sp_std::fmt::Debug1090    for ChargeTransactionPayment<T>1091{1092    #[cfg(feature = "std")]1093    fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1094        write!(f, "ChargeTransactionPayment<{:?}>", self.0)1095    }1096    #[cfg(not(feature = "std"))]1097    fn fmt(&self, _: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1098        Ok(())1099    }1100}11011102impl<T: Trait + transaction_payment::Trait + Send + Sync> ChargeTransactionPayment<T>1103where1104    T::Call:1105        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1106    BalanceOf<T>: Send + Sync + FixedPointOperand,1107{1108    /// utility constructor. Used only in client/factory code.1109    pub fn from(fee: BalanceOf<T>) -> Self {1110        Self(fee)1111    }11121113    pub fn traditional_fee(1114        len: usize,1115        info: &DispatchInfoOf<T::Call>,1116        tip: BalanceOf<T>,1117    ) -> BalanceOf<T>1118    where1119        T::Call: Dispatchable<Info = DispatchInfo>,1120    {1121        <transaction_payment::Module<T>>::compute_fee(len as u32, info, tip)1122    }11231124    fn withdraw_fee(1125        &self,1126        who: &T::AccountId,1127        call: &T::Call,1128        info: &DispatchInfoOf<T::Call>,1129        len: usize,1130    ) -> Result<(BalanceOf<T>, Option<NegativeImbalanceOf<T>>), TransactionValidityError> {1131        let tip = self.0;11321133        // Set fee based on call type. Creating collection costs 1 Unique.1134        // All other transactions have traditional fees so far1135        let fee = match call.is_sub_type() {1136            Some(Call::create_collection(..)) => <BalanceOf<T>>::from(1_000_000_000),1137            _ => Self::traditional_fee(len, info, tip), // Flat fee model, use only for testing purposes1138                                                        // _ => <BalanceOf<T>>::from(100)1139        };11401141        // Determine who is paying transaction fee based on ecnomic model1142        // Parse call to extract collection ID and access collection sponsor1143        let sponsor: T::AccountId = match call.is_sub_type() {1144            Some(Call::create_item(collection_id, _properties, _owner)) => {1145                <Collection<T>>::get(collection_id).sponsor1146            }1147            Some(Call::transfer(_new_owner, collection_id, _item_id, _value)) => {1148                <Collection<T>>::get(collection_id).sponsor1149            }11501151            _ => T::AccountId::default(),1152        };11531154        let mut who_pays_fee: T::AccountId = sponsor.clone();1155        if sponsor == T::AccountId::default() {1156            who_pays_fee = who.clone();1157        }11581159        // Only mess with balances if fee is not zero.1160        if fee.is_zero() {1161            return Ok((fee, None));1162        }11631164        match <T as transaction_payment::Trait>::Currency::withdraw(1165            &who_pays_fee,1166            fee,1167            if tip.is_zero() {1168                WithdrawReason::TransactionPayment.into()1169            } else {1170                WithdrawReason::TransactionPayment | WithdrawReason::Tip1171            },1172            ExistenceRequirement::KeepAlive,1173        ) {1174            Ok(imbalance) => Ok((fee, Some(imbalance))),1175            Err(_) => Err(InvalidTransaction::Payment.into()),1176        }1177    }1178}11791180impl<T: Trait + transaction_payment::Trait + Send + Sync> SignedExtension1181    for ChargeTransactionPayment<T>1182where1183    BalanceOf<T>: Send + Sync + From<u64> + FixedPointOperand,1184    T::Call:1185        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1186{1187    const IDENTIFIER: &'static str = "ChargeTransactionPayment";1188    type AccountId = T::AccountId;1189    type Call = T::Call;1190    type AdditionalSigned = ();1191    type Pre = (1192        BalanceOf<T>,1193        Self::AccountId,1194        Option<NegativeImbalanceOf<T>>,1195        BalanceOf<T>,1196    );1197    fn additional_signed(&self) -> sp_std::result::Result<(), TransactionValidityError> {1198        Ok(())1199    }12001201    fn validate(1202        &self,1203        who: &Self::AccountId,1204        call: &Self::Call,1205        info: &DispatchInfoOf<Self::Call>,1206        len: usize,1207    ) -> TransactionValidity {1208        let (fee, _) = self.withdraw_fee(who, call, info, len)?;12091210        let mut r = ValidTransaction::default();1211        // NOTE: we probably want to maximize the _fee (of any type) per weight unit_ here, which1212        // will be a bit more than setting the priority to tip. For now, this is enough.1213        r.priority = fee.saturated_into::<TransactionPriority>();1214        Ok(r)1215    }12161217    fn pre_dispatch(1218        self,1219        who: &Self::AccountId,1220        call: &Self::Call,1221        info: &DispatchInfoOf<Self::Call>,1222        len: usize,1223    ) -> Result<Self::Pre, TransactionValidityError> {1224        let (fee, imbalance) = self.withdraw_fee(who, call, info, len)?;1225        Ok((self.0, who.clone(), imbalance, fee))1226    }12271228    fn post_dispatch(1229        pre: Self::Pre,1230        info: &DispatchInfoOf<Self::Call>,1231        post_info: &PostDispatchInfoOf<Self::Call>,1232        len: usize,1233        _result: &DispatchResult,1234    ) -> Result<(), TransactionValidityError> {1235        let (tip, who, imbalance, fee) = pre;1236        if let Some(payed) = imbalance {1237            let actual_fee = <transaction_payment::Module<T>>::compute_actual_fee(1238                len as u32, info, post_info, tip,1239            );1240            let refund = fee.saturating_sub(actual_fee);1241            let actual_payment =1242                match <T as transaction_payment::Trait>::Currency::deposit_into_existing(1243                    &who, refund,1244                ) {1245                    Ok(refund_imbalance) => {1246                        // The refund cannot be larger than the up front payed max weight.1247                        // `PostDispatchInfo::calc_unspent` guards against such a case.1248                        match payed.offset(refund_imbalance) {1249                            Ok(actual_payment) => actual_payment,1250                            Err(_) => return Err(InvalidTransaction::Payment.into()),1251                        }1252                    }1253                    // We do not recreate the account using the refund. The up front payment1254                    // is gone in that case.1255                    Err(_) => payed,1256                };1257            let imbalances = actual_payment.split(tip);1258            <T as transaction_payment::Trait>::OnTransactionPayment::on_unbalanceds(1259                Some(imbalances.0).into_iter().chain(Some(imbalances.1)),1260            );1261        }1262        Ok(())1263    }1264}