git.delta.rocks / unique-network / refs/commits / d62b2048fe9a

1#![cfg_attr(not(feature = "std"), no_std)]23#[cfg(feature = "std")]4pub use serde::*;56use codec::{Decode, Encode};7pub use frame_support::{8    construct_runtime, decl_event, decl_module, decl_storage,9    dispatch::DispatchResult,10    ensure, parameter_types,11    traits::{12        Currency, ExistenceRequirement, Get, Imbalance, KeyOwnerProofSystem, OnUnbalanced,13        Randomness, WithdrawReason,14    },15    weights::{16        constants::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, WEIGHT_PER_SECOND},17        DispatchInfo, GetDispatchInfo, IdentityFee, Pays, PostDispatchInfo, Weight,18        WeightToFeePolynomial,19    },20    IsSubType, StorageValue,21};2223use frame_system::{self as system, ensure_signed};24use sp_runtime::sp_std::prelude::Vec;25use sp_runtime::{26    traits::{27        DispatchInfoOf, Dispatchable, PostDispatchInfoOf, SaturatedConversion, Saturating,28        SignedExtension, Zero,29    },30    transaction_validity::{31        InvalidTransaction, TransactionPriority, TransactionValidity, TransactionValidityError,32        ValidTransaction,33    },34    FixedPointOperand, FixedU128,35};3637#[cfg(test)]38mod mock;3940#[cfg(test)]41mod tests;4243// Structs44// #region4546#[derive(Encode, Decode, Eq, Debug, Clone, PartialEq)]47#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]48pub enum CollectionMode {49    Invalid,50    // custom data size51    NFT(u32),52    // decimal points53    Fungible(u32),54    // custom data size and decimal points55    ReFungible(u32, u32),56}5758impl Into<u8> for CollectionMode {59    fn into(self) -> u8 {60        match self {61            CollectionMode::Invalid => 0,62            CollectionMode::NFT(_) => 1,63            CollectionMode::Fungible(_) => 2,64            CollectionMode::ReFungible(_, _) => 3,65        }66    }67}6869#[derive(Encode, Decode, Eq, Debug, Clone, PartialEq)]70#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]71pub enum AccessMode {72    Normal,73    WhiteList,74}75impl Default for AccessMode {76    fn default() -> Self {77        Self::Normal78    }79}8081impl Default for CollectionMode {82    fn default() -> Self {83        Self::Invalid84    }85}8687#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]88#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]89pub struct Ownership<AccountId> {90    pub owner: AccountId,91    pub fraction: u128,92}9394#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]95#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]96pub struct CollectionType<AccountId> {97    pub owner: AccountId,98    pub mode: CollectionMode,99    pub access: AccessMode,100    pub decimal_points: u32,101    pub name: Vec<u16>,        // 64 include null escape char102    pub description: Vec<u16>, // 256 include null escape char103    pub token_prefix: Vec<u8>, // 16 include null escape char104    pub custom_data_size: u32,105    pub mint_mode: bool,106    pub offchain_schema: Vec<u8>,107    pub sponsor: AccountId, // Who pays fees. If set to default address, the fees are applied to the transaction sender108    pub unconfirmed_sponsor: AccountId, // Sponsor address that has not yet confirmed sponsorship109}110111#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]112#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]113pub struct CollectionAdminsType<AccountId> {114    pub admin: AccountId,115    pub collection_id: u64,116}117118#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]119#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]120pub struct NftItemType<AccountId> {121    pub collection: u64,122    pub owner: AccountId,123    pub data: Vec<u8>,124}125126#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]127#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]128pub struct FungibleItemType<AccountId> {129    pub collection: u64,130    pub owner: AccountId,131    pub value: u128,132}133134#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]135#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]136pub struct ReFungibleItemType<AccountId> {137    pub collection: u64,138    pub owner: Vec<Ownership<AccountId>>,139    pub data: Vec<u8>,140}141142#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]143#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]144pub struct ApprovePermissions<AccountId> {145    pub approved: AccountId,146    pub amount: u64,147}148149#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]150#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]151pub struct VestingItem<AccountId, Moment> {152    pub sender: AccountId,153    pub recipient: AccountId,154    pub collection_id: u64,155    pub item_id: u64,156    pub amount: u64,157    pub vesting_date: Moment,158}159160pub trait Trait: system::Trait {161    type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;162}163164// #endregion165166decl_storage! {167    trait Store for Module<T: Trait> as Nft {168169        // Private members170        NextCollectionID: u64;171        CreatedCollectionCount: u64;172        ChainVersion: u64;173        ItemListIndex: map hasher(blake2_128_concat) u64 => u64;174175        pub Collection get(fn collection) config(): map hasher(identity) u64 => CollectionType<T::AccountId>;176        pub AdminList get(fn admin_list_collection): map hasher(identity) u64 => Vec<T::AccountId>;177        pub WhiteList get(fn white_list): map hasher(identity) u64 => Vec<T::AccountId>;178179        /// Balance owner per collection map180        pub Balance get(fn balance_count): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) T::AccountId => u64;181182        /// second parameter: item id + owner account id183        pub ApprovedList get(fn approved): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) (u64, T::AccountId) => Vec<ApprovePermissions<T::AccountId>>;184185        /// Item collections186        pub NftItemList get(fn nft_item_id) config(): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => NftItemType<T::AccountId>;187        pub FungibleItemList get(fn fungible_item_id) config(): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => FungibleItemType<T::AccountId>;188        pub ReFungibleItemList get(fn refungible_item_id) config(): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) u64 => ReFungibleItemType<T::AccountId>;189190        /// Index list191        pub AddressTokens get(fn address_tokens): double_map hasher(blake2_128_concat) u64, hasher(blake2_128_concat) T::AccountId => Vec<u64>;192193        // Sponsorship194        pub ContractSponsor get(fn contract_sponsor): map hasher(identity) T::AccountId => T::AccountId;195        pub UnconfirmedContractSponsor get(fn unconfirmed_contract_sponsor): map hasher(identity) T::AccountId => T::AccountId;196    }197    add_extra_genesis {198        build(|config: &GenesisConfig<T>| {199			// Modification of storage200            for (_num, _c) in &config.collection {201                <Module<T>>::init_collection(_c);202            }203204            for (_num, _q, _i) in &config.nft_item_id {205                <Module<T>>::init_nft_token(_i);206            }207208            for (_num, _q, _i) in &config.fungible_item_id {209                <Module<T>>::init_fungible_token(_i);210            }211212            for (_num, _q, _i) in &config.refungible_item_id {213                <Module<T>>::init_refungible_token(_i);214            }215		})216    }217}218219decl_event!(220    pub enum Event<T>221    where222        AccountId = <T as system::Trait>::AccountId,223    {224        /// New collection was created225        /// 226        /// # Arguments227        /// 228        /// * collection_id: Globally unique identifier of newly created collection.229        /// 230        /// * mode: [CollectionMode] converted into u8.231        /// 232        /// * account_id: Collection owner.233        Created(u64, u8, AccountId),234235        /// New item was created.236        /// 237        /// # Arguments238        /// 239        /// * collection_id: Id of the collection where item was created.240        /// 241        /// * item_id: Id of an item. Unique within the collection.242        ItemCreated(u64, u64),243244        /// Collection item was burned.245        /// 246        /// # Arguments247        /// 248        /// collection_id.249        /// 250        /// item_id: Identifier of burned NFT.251        ItemDestroyed(u64, u64),252    }253);254255decl_module! {256    pub struct Module<T: Trait> for enum Call where origin: T::Origin {257258        fn deposit_event() = default;259260        fn on_initialize(now: T::BlockNumber) -> Weight {261262            if ChainVersion::get() < 2263            {264                let value = NextCollectionID::get();265                CreatedCollectionCount::put(value);266                ChainVersion::put(2);267            }268269            0270        }271272        /// This method creates a Collection of NFTs. Each Token may have multiple properties encoded as an array of bytes of certain length. The initial owner and admin of the collection are set to the address that signed the transaction. Both addresses can be changed later.273        /// 274        /// # Permissions275        /// 276        /// * Anyone.277        /// 278        /// # Arguments279        /// 280        /// * collection_name: UTF-16 string with collection name (limit 64 characters), will be stored as zero-terminated.281        /// 282        /// * collection_description: UTF-16 string with collection description (limit 256 characters), will be stored as zero-terminated.283        /// 284        /// * token_prefix: UTF-8 string with token prefix.285        /// 286        /// * mode: [CollectionMode] collection type and type dependent data.287        // returns collection ID288        #[weight = 0]289        pub fn create_collection(origin,290                                 collection_name: Vec<u16>,291                                 collection_description: Vec<u16>,292                                 token_prefix: Vec<u8>,293                                 mode: CollectionMode) -> DispatchResult {294295            // Anyone can create a collection296            let who = ensure_signed(origin)?;297            let custom_data_size = match mode {298                CollectionMode::NFT(size) => size,299                CollectionMode::ReFungible(size, _) => size,300                _ => 0301            };302303            let decimal_points = match mode {304                CollectionMode::Fungible(points) => points,305                CollectionMode::ReFungible(_, points) => points,306                _ => 0307            };308309            // check params310            ensure!(decimal_points <= 4, "decimal_points parameter must be lower than 4");311312            let mut name = collection_name.to_vec();313            name.push(0);314            ensure!(name.len() <= 64, "Collection name can not be longer than 63 char");315316            let mut description = collection_description.to_vec();317            description.push(0);318            ensure!(name.len() <= 256, "Collection description can not be longer than 255 char");319320            let mut prefix = token_prefix.to_vec();321            prefix.push(0);322            ensure!(prefix.len() <= 16, "Token prefix can not be longer than 15 char");323324            // Generate next collection ID325            let next_id = CreatedCollectionCount::get()326                .checked_add(1)327                .expect("collection id error");328329            CreatedCollectionCount::put(next_id);330331            // Create new collection332            let new_collection = CollectionType {333                owner: who.clone(),334                name: name,335                mode: mode.clone(),336                mint_mode: false,337                access: AccessMode::Normal,338                description: description,339                decimal_points: decimal_points,340                token_prefix: prefix,341                offchain_schema: Vec::new(),342                custom_data_size: custom_data_size,343                sponsor: T::AccountId::default(),344                unconfirmed_sponsor: T::AccountId::default(),345            };346347            // Add new collection to map348            <Collection<T>>::insert(next_id, new_collection);349350            // call event351            Self::deposit_event(RawEvent::Created(next_id, mode.into(), who.clone()));352353            Ok(())354        }355356        /// **DANGEROUS**: Destroys collection and all NFTs within this collection. Users irrecoverably lose their assets and may lose real money.357        /// 358        /// # Permissions359        /// 360        /// * Collection Owner.361        /// 362        /// # Arguments363        /// 364        /// * collection_id: collection to destroy.365        #[weight = 0]366        pub fn destroy_collection(origin, collection_id: u64) -> DispatchResult {367368            let sender = ensure_signed(origin)?;369            Self::check_owner_permissions(collection_id, sender)?;370371            // TODO Items remove372            <AddressTokens<T>>::remove_prefix(collection_id);373            <ApprovedList<T>>::remove_prefix(collection_id);374            <Balance<T>>::remove_prefix(collection_id);375            <ItemListIndex>::remove(collection_id);376            <AdminList<T>>::remove(collection_id);377            <Collection<T>>::remove(collection_id);378            <WhiteList<T>>::remove(collection_id);379380            Ok(())381        }382383        /// Add an address to white list.384        /// 385        /// # Permissions386        /// 387        /// * Collection Owner388        /// * Collection Admin389        /// 390        /// # Arguments391        /// 392        /// * collection_id.393        /// 394        /// * address.395        #[weight = 0]396        pub fn add_to_white_list(origin, collection_id: u64, address: T::AccountId) -> DispatchResult{397398            let sender = ensure_signed(origin)?;399            Self::check_owner_or_admin_permissions(collection_id, sender)?;400401            let mut white_list_collection: Vec<T::AccountId>;402            if <WhiteList<T>>::contains_key(collection_id) {403                white_list_collection = <WhiteList<T>>::get(collection_id);404                if !white_list_collection.contains(&address.clone())405                {406                    white_list_collection.push(address.clone());407                }408            }409            else {410                white_list_collection = Vec::new();411                white_list_collection.push(address.clone());412            }413414            <WhiteList<T>>::insert(collection_id, white_list_collection);415            Ok(())416        }417418        /// Remove an address from white list.419        /// 420        /// # Permissions421        /// 422        /// * Collection Owner423        /// * Collection Admin424        /// 425        /// # Arguments426        /// 427        /// * collection_id.428        /// 429        /// * address.430        #[weight = 0]431        pub fn remove_from_white_list(origin, collection_id: u64, address: T::AccountId) -> DispatchResult{432433            let sender = ensure_signed(origin)?;434            Self::check_owner_or_admin_permissions(collection_id, sender)?;435436            if <WhiteList<T>>::contains_key(collection_id) {437                let mut white_list_collection = <WhiteList<T>>::get(collection_id);438                if white_list_collection.contains(&address.clone())439                {440                    white_list_collection.retain(|i| *i != address.clone());441                    <WhiteList<T>>::insert(collection_id, white_list_collection);442                }443            }444445            Ok(())446        }447448        /// Toggle between normal and white list access for the methods with access for `Anyone`.449        /// 450        /// # Permissions451        /// 452        /// * Collection Owner.453        /// 454        /// # Arguments455        /// 456        /// * collection_id.457        /// 458        /// * mode: [AccessMode]459        #[weight = 0]460        pub fn set_public_access_mode(origin, collection_id: u64, mode: AccessMode) -> DispatchResult461        {462            let sender = ensure_signed(origin)?;463464            Self::check_owner_permissions(collection_id, sender)?;465            let mut target_collection = <Collection<T>>::get(collection_id);466            target_collection.access = mode;467            <Collection<T>>::insert(collection_id, target_collection);468469            Ok(())470        }471472        /// Allows Anyone to create tokens if:473        /// * White List is enabled, and474        /// * Address is added to white list, and475        /// * This method was called with True parameter476        /// 477        /// # Permissions478        /// * Collection Owner479        ///480        /// # Arguments481        /// 482        /// * collection_id.483        /// 484        /// * mint_permission: Boolean parameter. If True, allows minting to Anyone with conditions above.485        #[weight = 0]486        pub fn set_mint_permission(origin, collection_id: u64, mint_permission: bool) -> DispatchResult487        {488            let sender = ensure_signed(origin)?;489490            Self::check_owner_permissions(collection_id, sender)?;491            let mut target_collection = <Collection<T>>::get(collection_id);492            target_collection.mint_mode = mint_permission;493            <Collection<T>>::insert(collection_id, target_collection);494495            Ok(())496        }497498        /// Change the owner of the collection.499        /// 500        /// # Permissions501        /// 502        /// * Collection Owner.503        /// 504        /// # Arguments505        /// 506        /// * collection_id.507        /// 508        /// * new_owner.509        #[weight = 0]510        pub fn change_collection_owner(origin, collection_id: u64, new_owner: T::AccountId) -> DispatchResult {511512            let sender = ensure_signed(origin)?;513            Self::check_owner_permissions(collection_id, sender)?;514            let mut target_collection = <Collection<T>>::get(collection_id);515            target_collection.owner = new_owner;516            <Collection<T>>::insert(collection_id, target_collection);517518            Ok(())519        }520521        /// Adds an admin of the Collection.522        /// NFT Collection can be controlled by multiple admin addresses (some which can also be servers, for example). Admins can issue and burn NFTs, as well as add and remove other admins, but cannot change NFT or Collection ownership. 523        /// 524        /// # Permissions525        /// 526        /// * Collection Owner.527        /// * Collection Admin.528        /// 529        /// # Arguments530        /// 531        /// * collection_id: ID of the Collection to add admin for.532        /// 533        /// * new_admin_id: Address of new admin to add.534        #[weight = 0]535        pub fn add_collection_admin(origin, collection_id: u64, new_admin_id: T::AccountId) -> DispatchResult {536537            let sender = ensure_signed(origin)?;538            Self::check_owner_or_admin_permissions(collection_id, sender)?;539            let mut admin_arr: Vec<T::AccountId> = Vec::new();540541            if <AdminList<T>>::contains_key(collection_id)542            {543                admin_arr = <AdminList<T>>::get(collection_id);544                ensure!(!admin_arr.contains(&new_admin_id), "Account already has admin role");545            }546547            admin_arr.push(new_admin_id);548            <AdminList<T>>::insert(collection_id, admin_arr);549550            Ok(())551        }552553        /// Remove admin address of the Collection. An admin address can remove itself. List of admins may become empty, in which case only Collection Owner will be able to add an Admin.554        ///555        /// # Permissions556        /// 557        /// * Collection Owner.558        /// * Collection Admin.559        /// 560        /// # Arguments561        /// 562        /// * collection_id: ID of the Collection to remove admin for.563        /// 564        /// * account_id: Address of admin to remove.565        #[weight = 0]566        pub fn remove_collection_admin(origin, collection_id: u64, account_id: T::AccountId) -> DispatchResult {567568            let sender = ensure_signed(origin)?;569            Self::check_owner_or_admin_permissions(collection_id, sender)?;570571            if <AdminList<T>>::contains_key(collection_id)572            {573                let mut admin_arr = <AdminList<T>>::get(collection_id);574                admin_arr.retain(|i| *i != account_id);575                <AdminList<T>>::insert(collection_id, admin_arr);576            }577578            Ok(())579        }580581        /// # Permissions582        /// 583        /// * Collection Owner584        /// 585        /// # Arguments586        /// 587        /// * collection_id.588        /// 589        /// * new_sponsor.590        #[weight = 0]591        pub fn set_collection_sponsor(origin, collection_id: u64, new_sponsor: T::AccountId) -> DispatchResult {592593            let sender = ensure_signed(origin)?;594            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");595596            let mut target_collection = <Collection<T>>::get(collection_id);597            ensure!(sender == target_collection.owner, "You do not own this collection");598599            target_collection.unconfirmed_sponsor = new_sponsor;600            <Collection<T>>::insert(collection_id, target_collection);601602            Ok(())603        }604605        /// # Permissions606        /// 607        /// * Sponsor.608        /// 609        /// # Arguments610        /// 611        /// * collection_id.612        #[weight = 0]613        pub fn confirm_sponsorship(origin, collection_id: u64) -> DispatchResult {614615            let sender = ensure_signed(origin)?;616            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");617618            let mut target_collection = <Collection<T>>::get(collection_id);619            ensure!(sender == target_collection.unconfirmed_sponsor, "This address is not set as sponsor, use setCollectionSponsor first");620621            target_collection.sponsor = target_collection.unconfirmed_sponsor;622            target_collection.unconfirmed_sponsor = T::AccountId::default();623            <Collection<T>>::insert(collection_id, target_collection);624625            Ok(())626        }627628        /// Switch back to pay-per-own-transaction model.629        ///630        /// # Permissions631        ///632        /// * Collection owner.633        /// 634        /// # Arguments635        /// 636        /// * collection_id.637        #[weight = 0]638        pub fn remove_collection_sponsor(origin, collection_id: u64) -> DispatchResult {639640            let sender = ensure_signed(origin)?;641            ensure!(<Collection<T>>::contains_key(collection_id), "This collection does not exist");642643            let mut target_collection = <Collection<T>>::get(collection_id);644            ensure!(sender == target_collection.owner, "You do not own this collection");645646            target_collection.sponsor = T::AccountId::default();647            <Collection<T>>::insert(collection_id, target_collection);648649            Ok(())650        }651652        /// This method creates a concrete instance of NFT Collection created with CreateCollection method.653        /// 654        /// # Permissions655        /// 656        /// * Collection Owner.657        /// * Collection Admin.658        /// * Anyone if659        ///     * White List is enabled, and660        ///     * Address is added to white list, and661        ///     * MintPermission is enabled (see SetMintPermission method)662        /// 663        /// # Arguments664        /// 665        /// * collection_id: ID of the collection.666        /// 667        /// * properties: Array of bytes that contains NFT properties. Since NFT Module is agnostic of properties meaning, it is treated purely as an array of bytes.668        /// 669        /// * owner: Address, initial owner of the NFT.670        #[weight = 0]671        pub fn create_item(origin, collection_id: u64, properties: Vec<u8>, owner: T::AccountId) -> DispatchResult {672673            let sender = ensure_signed(origin)?;674            Self::collection_exists(collection_id)?;675            let target_collection = <Collection<T>>::get(collection_id);676677            if !Self::is_owner_or_admin_permissions(collection_id, sender.clone()) {678                ensure!(target_collection.mint_mode == true, "Public minting is not allowed for this collection");679                Self::check_white_list(collection_id, &owner)?;680                Self::check_white_list(collection_id, &sender)?;681            }682683            match target_collection.mode684            {685                CollectionMode::NFT(_) => {686687                    // check size688                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");689690                    // Create nft item691                    let item = NftItemType {692                        collection: collection_id,693                        owner: owner,694                        data: properties.clone(),695                    };696697                    Self::add_nft_item(item)?;698699                },700                CollectionMode::Fungible(_) => {701702                    // check size703                    ensure!(properties.len() as u32 == 0, "Size of item must be 0 with fungible type");704705                    let item = FungibleItemType {706                        collection: collection_id,707                        owner: owner,708                        value: (10 as u128).pow(target_collection.decimal_points)709                    };710711                    Self::add_fungible_item(item)?;712                },713                CollectionMode::ReFungible(_, _) => {714715                    // check size716                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");717718                    let mut owner_list = Vec::new();719                    let value = (10 as u128).pow(target_collection.decimal_points);720                    owner_list.push(Ownership {owner: owner.clone(), fraction: value});721722                    let item = ReFungibleItemType {723                        collection: collection_id,724                        owner: owner_list,725                        data: properties.clone()726                    };727728                    Self::add_refungible_item(item)?;729                },730                _ => { ensure!(1 == 0,"just error"); }731732            };733734            // call event735            Self::deposit_event(RawEvent::ItemCreated(collection_id, <ItemListIndex>::get(collection_id)));736737            Ok(())738        }739740        /// Destroys a concrete instance of NFT.741        /// 742        /// # Permissions743        /// 744        /// * Collection Owner.745        /// * Collection Admin.746        /// * Current NFT Owner.747        /// 748        /// # Arguments749        /// 750        /// * collection_id: ID of the collection.751        /// 752        /// * item_id: ID of NFT to burn.753        #[weight = 0]754        pub fn burn_item(origin, collection_id: u64, item_id: u64) -> DispatchResult {755756            let sender = ensure_signed(origin)?;757            Self::collection_exists(collection_id)?;758759            // Transfer permissions check760            let target_collection = <Collection<T>>::get(collection_id);761            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id) || 762                Self::is_owner_or_admin_permissions(collection_id, sender.clone()), 763                "Only item owner, collection owner and admins can modify item");764765            if target_collection.access == AccessMode::WhiteList {766                Self::check_white_list(collection_id, &sender)?;767            }768769            match target_collection.mode770            {771                CollectionMode::NFT(_) => Self::burn_nft_item(collection_id, item_id)?,772                CollectionMode::Fungible(_)  => Self::burn_fungible_item(collection_id, item_id)?,773                CollectionMode::ReFungible(_, _)  => Self::burn_refungible_item(collection_id, item_id, sender.clone())?,774                _ => ()775            };776777            // call event778            Self::deposit_event(RawEvent::ItemDestroyed(collection_id, item_id));779780            Ok(())781        }782783        /// Change ownership of the token.784        /// 785        /// # Permissions786        /// 787        /// * Collection Owner788        /// * Collection Admin789        /// * Current NFT owner790        ///791        /// # Arguments792        /// 793        /// * recipient: Address of token recipient.794        /// 795        /// * collection_id.796        /// 797        /// * item_id: ID of the item798        ///     * Non-Fungible Mode: Required.799        ///     * Fungible Mode: Ignored.800        ///     * Re-Fungible Mode: Required.801        /// 802        /// * value: Amount to transfer.803        ///     * Non-Fungible Mode: Ignored804        ///     * Fungible Mode: Must specify transferred amount805        ///     * Re-Fungible Mode: Must specify transferred portion (between 0 and 1)806        #[weight = 0]807        pub fn transfer(origin, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64) -> DispatchResult {808809            let sender = ensure_signed(origin)?;810811            // Transfer permissions check812            let target_collection = <Collection<T>>::get(collection_id);813            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id) || 814                Self::is_owner_or_admin_permissions(collection_id, sender.clone()), 815                "Only item owner, collection owner and admins can modify item");816817            if target_collection.access == AccessMode::WhiteList {818                Self::check_white_list(collection_id, &sender)?;819                Self::check_white_list(collection_id, &recipient)?;820            }821822            match target_collection.mode823            {824                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, sender.clone(), recipient)?,825                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, sender.clone(), recipient)?,826                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, sender.clone(), recipient)?,827                _ => ()828            };829830            Ok(())831        }832833        /// Set, change, or remove approved address to transfer the ownership of the NFT.834        /// 835        /// # Permissions836        /// 837        /// * Collection Owner838        /// * Collection Admin839        /// * Current NFT owner840        /// 841        /// # Arguments842        /// 843        /// * approved: Address that is approved to transfer this NFT or zero (if needed to remove approval).844        /// 845        /// * collection_id.846        /// 847        /// * item_id: ID of the item.848        #[weight = 0]849        pub fn approve(origin, approved: T::AccountId, collection_id: u64, item_id: u64) -> DispatchResult {850851            let sender = ensure_signed(origin)?;852853            // Transfer permissions check854            let target_collection = <Collection<T>>::get(collection_id);855            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id) || 856                Self::is_owner_or_admin_permissions(collection_id, sender.clone()), 857                "Only item owner, collection owner and admins can approve");858859            if target_collection.access == AccessMode::WhiteList {860                Self::check_white_list(collection_id, &sender)?;861                Self::check_white_list(collection_id, &approved)?;862            }863864            // amount param stub865            let amount = 100000000;866867            let list_exists = <ApprovedList<T>>::contains_key(collection_id, (item_id, sender.clone()));868            if list_exists {869870                let mut list = <ApprovedList<T>>::get(collection_id, (item_id, sender.clone()));871                let item_contains = list.iter().any(|i| i.approved == approved);872873                if !item_contains {874                    list.push(ApprovePermissions { approved: approved.clone(), amount: amount });875                    <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);876                }877            } else {878879                let mut list = Vec::new();880                list.push(ApprovePermissions { approved: approved.clone(), amount: amount });881                <ApprovedList<T>>::insert(collection_id, (item_id, sender.clone()), list);882            }883884            Ok(())885        }886        887        /// Change ownership of a NFT on behalf of the owner. See Approve method for additional information. After this method executes, the approval is removed so that the approved address will not be able to transfer this NFT again from this owner.888        /// 889        /// # Permissions890        /// * Collection Owner891        /// * Collection Admin892        /// * Current NFT owner893        /// * Address approved by current NFT owner894        /// 895        /// # Arguments896        /// 897        /// * from: Address that owns token.898        /// 899        /// * recipient: Address of token recipient.900        /// 901        /// * collection_id.902        /// 903        /// * item_id: ID of the item.904        /// 905        /// * value: Amount to transfer.906        #[weight = 0]907        pub fn transfer_from(origin, from: T::AccountId, recipient: T::AccountId, collection_id: u64, item_id: u64, value: u64 ) -> DispatchResult {908909            let sender = ensure_signed(origin)?;910            let mut appoved_transfer = false;911912            // Check approve913            if <ApprovedList<T>>::contains_key(collection_id, (item_id, from.clone())) {914                let list_itm = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()));915                let opt_item = list_itm.iter().find(|i| i.approved == sender.clone());916                appoved_transfer = opt_item.is_some();917                ensure!(opt_item.unwrap().amount >= value, "Requested value more than approved");918            }919920            // Transfer permissions check921            let target_collection = <Collection<T>>::get(collection_id);922            ensure!(appoved_transfer || Self::is_owner_or_admin_permissions(collection_id, sender.clone()), 923                "Only item owner, collection owner and admins can modify items");924925            if target_collection.access == AccessMode::WhiteList {926                Self::check_white_list(collection_id, &sender)?;927                Self::check_white_list(collection_id, &recipient)?;928            }929930            // remove approve931            let approve_list: Vec<ApprovePermissions<T::AccountId>> = <ApprovedList<T>>::get(collection_id, (item_id, from.clone()))932                .into_iter().filter(|i| i.approved != sender.clone()).collect();933            <ApprovedList<T>>::insert(collection_id, (item_id, from.clone()), approve_list);934935936            match target_collection.mode937            {938                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, from, recipient)?,939                CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, from.clone(), recipient)?,940                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, from.clone(), recipient)?,941                _ => ()942            };943944            Ok(())945        }946947        ///948        #[weight = 0]949        pub fn safe_transfer_from(origin, collection_id: u64, item_id: u64, new_owner: T::AccountId) -> DispatchResult {950951            // let no_perm_mes = "You do not have permissions to modify this collection";952            // ensure!(<ApprovedList<T>>::contains_key((collection_id, item_id)), no_perm_mes);953            // let list_itm = <ApprovedList<T>>::get((collection_id, item_id));954            // ensure!(list_itm.contains(&new_owner.clone()), no_perm_mes);955956            // // on_nft_received  call957958            // Self::transfer(origin, collection_id, item_id, new_owner)?;959960            Ok(())961        }962963        /// Set off-chain data schema.964        /// 965        /// # Permissions966        /// 967        /// * Collection Owner968        /// * Collection Admin969        /// 970        /// # Arguments971        /// 972        /// * collection_id.973        /// 974        /// * schema: String representing the offchain data schema.975        #[weight = 0]976        pub fn set_offchain_schema(977            origin,978            collection_id: u64,979            schema: Vec<u8>980        ) -> DispatchResult {981            let sender = ensure_signed(origin)?;982            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;983984            let mut target_collection = <Collection<T>>::get(collection_id);985            target_collection.offchain_schema = schema;986            <Collection<T>>::insert(collection_id, target_collection);987988            Ok(())989        }990    }991}992993impl<T: Trait> Module<T> {994    fn add_fungible_item(item: FungibleItemType<T::AccountId>) -> DispatchResult {995        let current_index = <ItemListIndex>::get(item.collection)996            .checked_add(1)997            .expect("Item list index id error");998        let itemcopy = item.clone();999        let owner = item.owner.clone();1000        let value = item.value as u64;10011002        Self::add_token_index(item.collection, current_index, owner.clone())?;10031004        <ItemListIndex>::insert(item.collection, current_index);1005        <FungibleItemList<T>>::insert(item.collection, current_index, itemcopy);10061007        // Update balance1008        let new_balance = <Balance<T>>::get(item.collection, owner.clone())1009            .checked_add(value)1010            .unwrap();1011        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);10121013        Ok(())1014    }10151016    fn add_refungible_item(item: ReFungibleItemType<T::AccountId>) -> DispatchResult {1017        let current_index = <ItemListIndex>::get(item.collection)1018            .checked_add(1)1019            .expect("Item list index id error");1020        let itemcopy = item.clone();10211022        let value = item.owner.first().unwrap().fraction as u64;1023        let owner = item.owner.first().unwrap().owner.clone();10241025        Self::add_token_index(item.collection, current_index, owner.clone())?;10261027        <ItemListIndex>::insert(item.collection, current_index);1028        <ReFungibleItemList<T>>::insert(item.collection, current_index, itemcopy);10291030        // Update balance1031        let new_balance = <Balance<T>>::get(item.collection, owner.clone())1032            .checked_add(value)1033            .unwrap();1034        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);10351036        Ok(())1037    }10381039    fn add_nft_item(item: NftItemType<T::AccountId>) -> DispatchResult {1040        let current_index = <ItemListIndex>::get(item.collection)1041            .checked_add(1)1042            .expect("Item list index id error");10431044        let item_owner = item.owner.clone();1045        let collection_id = item.collection.clone();1046        Self::add_token_index(collection_id, current_index, item.owner.clone())?;10471048        <ItemListIndex>::insert(collection_id, current_index);1049        <NftItemList<T>>::insert(collection_id, current_index, item);10501051        // Update balance1052        let new_balance = <Balance<T>>::get(collection_id, item_owner.clone())1053            .checked_add(1)1054            .unwrap();1055        <Balance<T>>::insert(collection_id, item_owner.clone(), new_balance);10561057        Ok(())1058    }10591060    fn burn_refungible_item(collection_id: u64, item_id: u64, owner: T::AccountId) -> DispatchResult {1061        ensure!(1062            <ReFungibleItemList<T>>::contains_key(collection_id, item_id),1063            "Item does not exists"1064        );1065        let collection = <ReFungibleItemList<T>>::get(collection_id, item_id);1066        let item = collection1067            .owner1068            .iter()1069            .filter(|&i| i.owner == owner)1070            .next()1071            .unwrap();1072        Self::remove_token_index(collection_id, item_id, owner.clone())?;10731074        // remove approve list1075        <ApprovedList<T>>::remove(collection_id, (item_id, owner.clone()));10761077        // update balance1078        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())1079            .checked_sub(item.fraction as u64)1080            .unwrap();1081        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);10821083        <ReFungibleItemList<T>>::remove(collection_id, item_id);10841085        Ok(())1086    }10871088    fn burn_nft_item(collection_id: u64, item_id: u64) -> DispatchResult {1089        ensure!(1090            <NftItemList<T>>::contains_key(collection_id, item_id),1091            "Item does not exists"1092        );1093        let item = <NftItemList<T>>::get(collection_id, item_id);1094        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;10951096        // remove approve list1097        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));10981099        // update balance1100        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())1101            .checked_sub(1)1102            .unwrap();1103        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);1104        <NftItemList<T>>::remove(collection_id, item_id);11051106        Ok(())1107    }11081109    fn burn_fungible_item(collection_id: u64, item_id: u64) -> DispatchResult {1110        ensure!(1111            <FungibleItemList<T>>::contains_key(collection_id, item_id),1112            "Item does not exists"1113        );1114        let item = <FungibleItemList<T>>::get(collection_id, item_id);1115        Self::remove_token_index(collection_id, item_id, item.owner.clone())?;11161117        // remove approve list1118        <ApprovedList<T>>::remove(collection_id, (item_id, item.owner.clone()));11191120        // update balance1121        let new_balance = <Balance<T>>::get(collection_id, item.owner.clone())1122            .checked_sub(item.value as u64)1123            .unwrap();1124        <Balance<T>>::insert(collection_id, item.owner.clone(), new_balance);11251126        <FungibleItemList<T>>::remove(collection_id, item_id);11271128        Ok(())1129    }11301131    fn collection_exists(collection_id: u64) -> DispatchResult {1132        ensure!(1133            <Collection<T>>::contains_key(collection_id),1134            "This collection does not exist"1135        );1136        Ok(())1137    }11381139    fn check_owner_permissions(collection_id: u64, subject: T::AccountId) -> DispatchResult {1140        Self::collection_exists(collection_id)?;11411142        let target_collection = <Collection<T>>::get(collection_id);1143        ensure!(1144            subject == target_collection.owner,1145            "You do not own this collection"1146        );11471148        Ok(())1149    }11501151    fn is_owner_or_admin_permissions(collection_id: u64, subject: T::AccountId) -> bool {11521153        let target_collection = <Collection<T>>::get(collection_id);1154        let mut result: bool = subject == target_collection.owner;1155        let exists = <AdminList<T>>::contains_key(collection_id);11561157        if !result & exists {1158            if <AdminList<T>>::get(collection_id).contains(&subject) {1159                result = true1160            }1161        }11621163        result1164    }11651166    fn check_owner_or_admin_permissions(collection_id: u64, subject: T::AccountId) -> DispatchResult {1167        1168        Self::collection_exists(collection_id)?;1169        let result = Self::is_owner_or_admin_permissions(collection_id, subject.clone());11701171        ensure!(result, "You do not have permissions to modify this collection");1172        Ok(())1173    }11741175    fn is_item_owner(subject: T::AccountId, collection_id: u64, item_id: u64) -> bool {1176        let target_collection = <Collection<T>>::get(collection_id);11771178        match target_collection.mode {1179            CollectionMode::NFT(_) => {1180                <NftItemList<T>>::get(collection_id, item_id).owner == subject1181            }1182            CollectionMode::Fungible(_) => {1183                <FungibleItemList<T>>::get(collection_id, item_id).owner == subject1184            }1185            CollectionMode::ReFungible(_, _) => {1186                <ReFungibleItemList<T>>::get(collection_id, item_id)1187                    .owner1188                    .iter()1189                    .any(|i| i.owner == subject)1190            }1191            CollectionMode::Invalid => false,1192        }1193    }11941195    fn check_white_list(collection_id: u64, address: &T::AccountId) -> DispatchResult {11961197        let mes = "Address is not in white list";1198        ensure!(<WhiteList<T>>::contains_key(collection_id), mes);1199        let wl = <WhiteList<T>>::get(collection_id);1200        ensure!(wl.contains(address), mes);12011202        Ok(())1203    }12041205    fn transfer_fungible(1206        collection_id: u64,1207        item_id: u64,1208        value: u64,1209        owner: T::AccountId,1210        new_owner: T::AccountId,1211    ) -> DispatchResult {12121213        ensure!(1214            <FungibleItemList<T>>::contains_key(collection_id, item_id),1215            "Item not exists"1216        );12171218        let full_item = <FungibleItemList<T>>::get(collection_id, item_id);1219        let amount = full_item.value;12201221        ensure!(amount >= value.into(), "Item balance not enouth");12221223        // update balance1224        let balance_old_owner = <Balance<T>>::get(collection_id, owner.clone())1225            .checked_sub(value)1226            .unwrap();1227        <Balance<T>>::insert(collection_id, owner.clone(), balance_old_owner);12281229        let mut new_owner_account_id = 0;1230        let new_owner_items = <AddressTokens<T>>::get(collection_id, new_owner.clone());1231        if new_owner_items.len() > 0 {1232            new_owner_account_id = new_owner_items[0];1233        }12341235        let val64 = value.into();12361237        // transfer1238        if amount == val64 && new_owner_account_id == 0 {1239            // change owner1240            // new owner do not have account1241            let mut new_full_item = full_item.clone();1242            new_full_item.owner = new_owner.clone();1243            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);12441245            // update balance1246            let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())1247                .checked_add(value)1248                .unwrap();1249            <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);12501251            // update index collection1252            Self::move_token_index(collection_id, item_id, owner.clone(), new_owner.clone())?;1253        } else {1254            let mut new_full_item = full_item.clone();1255            new_full_item.value -= val64;12561257            // separate amount1258            if new_owner_account_id > 0 {1259                // new owner has account1260                let mut item = <FungibleItemList<T>>::get(collection_id, new_owner_account_id);1261                item.value += val64;12621263                // update balance1264                let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())1265                    .checked_add(value)1266                    .unwrap();1267                <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);12681269                <FungibleItemList<T>>::insert(collection_id, new_owner_account_id, item);1270            } else {1271                // new owner do not have account1272                let item = FungibleItemType {1273                    collection: collection_id,1274                    owner: new_owner.clone(),1275                    value: val64,1276                };12771278                Self::add_fungible_item(item)?;1279            }12801281            if amount == val64 {1282                Self::remove_token_index(collection_id, item_id, full_item.owner.clone())?;12831284                // remove approve list1285                <ApprovedList<T>>::remove(collection_id, (item_id, full_item.owner.clone()));1286                <FungibleItemList<T>>::remove(collection_id, item_id);1287            }12881289            <FungibleItemList<T>>::insert(collection_id, item_id, new_full_item);1290        }12911292        Ok(())1293    }12941295    fn transfer_refungible(1296        collection_id: u64,1297        item_id: u64,1298        value: u64,1299        owner: T::AccountId,1300        new_owner: T::AccountId,1301    ) -> DispatchResult {13021303        ensure!(1304            <ReFungibleItemList<T>>::contains_key(collection_id, item_id),1305            "Item not exists"1306        );13071308        let full_item = <ReFungibleItemList<T>>::get(collection_id, item_id);1309        let item = full_item1310            .owner1311            .iter()1312            .filter(|i| i.owner == owner)1313            .next()1314            .unwrap();1315        let amount = item.fraction;13161317        ensure!(amount >= value.into(), "Item balance not enouth");13181319        // update balance1320        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())1321            .checked_sub(value)1322            .unwrap();1323        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);13241325        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())1326            .checked_add(value)1327            .unwrap();1328        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);13291330        let old_owner = item.owner.clone();1331        let new_owner_has_account = full_item.owner.iter().any(|i| i.owner == new_owner);1332        let val64 = value.into();13331334        // transfer1335        if amount == val64 && !new_owner_has_account {1336            // change owner1337            // new owner do not have account1338            let mut new_full_item = full_item.clone();1339            new_full_item1340                .owner1341                .iter_mut()1342                .find(|i| i.owner == owner)1343                .unwrap()1344                .owner = new_owner.clone();1345            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);13461347            // update index collection1348            Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;1349        } else {1350            let mut new_full_item = full_item.clone();1351            new_full_item1352                .owner1353                .iter_mut()1354                .find(|i| i.owner == owner)1355                .unwrap()1356                .fraction -= val64;13571358            // separate amount1359            if new_owner_has_account {1360                // new owner has account1361                new_full_item1362                    .owner1363                    .iter_mut()1364                    .find(|i| i.owner == new_owner)1365                    .unwrap()1366                    .fraction += val64;1367            } else {1368                // new owner do not have account1369                new_full_item.owner.push(Ownership {1370                    owner: new_owner.clone(),1371                    fraction: val64,1372                });1373                Self::add_token_index(collection_id, item_id, new_owner.clone())?;1374            }13751376            <ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);1377        }13781379        Ok(())1380    }13811382    fn transfer_nft(1383        collection_id: u64,1384        item_id: u64,1385        sender: T::AccountId,1386        new_owner: T::AccountId,1387    ) -> DispatchResult {1388    1389        ensure!(1390            <NftItemList<T>>::contains_key(collection_id, item_id),1391            "Item not exists"1392        );13931394        let mut item = <NftItemList<T>>::get(collection_id, item_id);13951396        ensure!(1397            sender == item.owner,1398            "sender parameter and item owner must be equal"1399        );14001401        // update balance1402        let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.clone())1403            .checked_sub(1)1404            .unwrap();1405        <Balance<T>>::insert(collection_id, item.owner.clone(), balance_old_owner);14061407        let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.clone())1408            .checked_add(1)1409            .unwrap();1410        <Balance<T>>::insert(collection_id, new_owner.clone(), balance_new_owner);14111412        // change owner1413        let old_owner = item.owner.clone();1414        item.owner = new_owner.clone();1415        <NftItemList<T>>::insert(collection_id, item_id, item);14161417        // update index collection1418        Self::move_token_index(collection_id, item_id, old_owner.clone(), new_owner.clone())?;14191420        // reset approved list1421        <ApprovedList<T>>::remove(collection_id, (item_id, old_owner));1422        Ok(())1423    }14241425    fn init_collection(item: &CollectionType<T::AccountId>){14261427                // check params1428                assert!(item.decimal_points <= 4, "decimal_points parameter must be lower than 4");1429                assert!(item.name.len() <= 64, "Collection name can not be longer than 63 char");1430                assert!(item.name.len() <= 256, "Collection description can not be longer than 255 char");1431                assert!(item.token_prefix.len() <= 16, "Token prefix can not be longer than 15 char");1432    1433                // Generate next collection ID1434                let next_id = CreatedCollectionCount::get()1435                    .checked_add(1)1436                    .expect("collection id error");1437    1438                CreatedCollectionCount::put(next_id);  1439    }14401441    fn init_nft_token(item: &NftItemType<T::AccountId>){14421443        let current_index = <ItemListIndex>::get(item.collection)1444            .checked_add(1)1445            .expect("Item list index id error");14461447        let item_owner = item.owner.clone();1448        let collection_id = item.collection.clone();1449        Self::add_token_index(collection_id, current_index, item.owner.clone()).unwrap();14501451        <ItemListIndex>::insert(collection_id, current_index);14521453        // Update balance1454        let new_balance = <Balance<T>>::get(collection_id, item_owner.clone())1455            .checked_add(1)1456            .unwrap();1457        <Balance<T>>::insert(collection_id, item_owner.clone(), new_balance);1458    }14591460    fn init_fungible_token(item: &FungibleItemType<T::AccountId>){14611462        let current_index = <ItemListIndex>::get(item.collection)1463            .checked_add(1)1464            .expect("Item list index id error");1465        let owner = item.owner.clone();1466        let value = item.value as u64;14671468        Self::add_token_index(item.collection, current_index, owner.clone()).unwrap();14691470        <ItemListIndex>::insert(item.collection, current_index);14711472        // Update balance1473        let new_balance = <Balance<T>>::get(item.collection, owner.clone())1474            .checked_add(value)1475            .unwrap();1476        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);1477    }14781479    fn init_refungible_token(item: &ReFungibleItemType<T::AccountId>){14801481        let current_index = <ItemListIndex>::get(item.collection)1482            .checked_add(1)1483            .expect("Item list index id error");14841485        let value = item.owner.first().unwrap().fraction as u64;1486        let owner = item.owner.first().unwrap().owner.clone();14871488        Self::add_token_index(item.collection, current_index, owner.clone()).unwrap();14891490        <ItemListIndex>::insert(item.collection, current_index);14911492        // Update balance1493        let new_balance = <Balance<T>>::get(item.collection, owner.clone())1494            .checked_add(value)1495            .unwrap();1496        <Balance<T>>::insert(item.collection, owner.clone(), new_balance);1497    }14981499    fn add_token_index(collection_id: u64, item_index: u64, owner: T::AccountId) -> DispatchResult {1500        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1501        if list_exists {1502            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1503            let item_contains = list.contains(&item_index.clone());15041505            if !item_contains {1506                list.push(item_index.clone());1507            }15081509            <AddressTokens<T>>::insert(collection_id, owner.clone(), list);1510        } else {1511            let mut itm = Vec::new();1512            itm.push(item_index.clone());1513            <AddressTokens<T>>::insert(collection_id, owner, itm);1514        }15151516        Ok(())1517    }15181519    fn remove_token_index(1520        collection_id: u64,1521        item_index: u64,1522        owner: T::AccountId,1523    ) -> DispatchResult {1524        let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.clone());1525        if list_exists {1526            let mut list = <AddressTokens<T>>::get(collection_id, owner.clone());1527            let item_contains = list.contains(&item_index.clone());15281529            if item_contains {1530                list.retain(|&item| item != item_index);1531                <AddressTokens<T>>::insert(collection_id, owner, list);1532            }1533        }15341535        Ok(())1536    }15371538    fn move_token_index(1539        collection_id: u64,1540        item_index: u64,1541        old_owner: T::AccountId,1542        new_owner: T::AccountId,1543    ) -> DispatchResult {1544        Self::remove_token_index(collection_id, item_index, old_owner)?;1545        Self::add_token_index(collection_id, item_index, new_owner)?;15461547        Ok(())1548    }1549}15501551////////////////////////////////////////////////////////////////////////////////////////////////////1552// Economic models1553// #region15541555/// Fee multiplier.1556pub type Multiplier = FixedU128;15571558type BalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1559    <T as system::Trait>::AccountId,1560>>::Balance;1561type NegativeImbalanceOf<T> = <<T as transaction_payment::Trait>::Currency as Currency<1562    <T as system::Trait>::AccountId,1563>>::NegativeImbalance;15641565/// Require the transactor pay for themselves and maybe include a tip to gain additional priority1566/// in the queue.1567#[derive(Encode, Decode, Clone, Eq, PartialEq)]1568pub struct ChargeTransactionPayment<T: transaction_payment::Trait + Send + Sync>(1569    #[codec(compact)] BalanceOf<T>,1570);15711572impl<T: Trait + transaction_payment::Trait + Send + Sync> sp_std::fmt::Debug1573    for ChargeTransactionPayment<T>1574{1575    #[cfg(feature = "std")]1576    fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1577        write!(f, "ChargeTransactionPayment<{:?}>", self.0)1578    }1579    #[cfg(not(feature = "std"))]1580    fn fmt(&self, _: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {1581        Ok(())1582    }1583}15841585impl<T: Trait + transaction_payment::Trait + Send + Sync> ChargeTransactionPayment<T>1586where1587    T::Call:1588        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1589    BalanceOf<T>: Send + Sync + FixedPointOperand,1590{1591    /// utility constructor. Used only in client/factory code.1592    pub fn from(fee: BalanceOf<T>) -> Self {1593        Self(fee)1594    }15951596    pub fn traditional_fee(1597        len: usize,1598        info: &DispatchInfoOf<T::Call>,1599        tip: BalanceOf<T>,1600    ) -> BalanceOf<T>1601    where1602        T::Call: Dispatchable<Info = DispatchInfo>,1603    {1604        <transaction_payment::Module<T>>::compute_fee(len as u32, info, tip)1605    }16061607    fn withdraw_fee(1608        &self,1609        who: &T::AccountId,1610        call: &T::Call,1611        info: &DispatchInfoOf<T::Call>,1612        len: usize,1613    ) -> Result<(BalanceOf<T>, Option<NegativeImbalanceOf<T>>), TransactionValidityError> {1614        let tip = self.0;16151616        // Set fee based on call type. Creating collection costs 1 Unique.1617        // All other transactions have traditional fees so far1618        let fee = match call.is_sub_type() {1619            Some(Call::create_collection(..)) => <BalanceOf<T>>::from(1_000_000_000),1620            _ => Self::traditional_fee(len, info, tip), // Flat fee model, use only for testing purposes1621                                                        // _ => <BalanceOf<T>>::from(100)1622        };16231624        // Determine who is paying transaction fee based on ecnomic model1625        // Parse call to extract collection ID and access collection sponsor1626        let sponsor: T::AccountId = match call.is_sub_type() {1627            Some(Call::create_item(collection_id, _properties, _owner)) => {1628                <Collection<T>>::get(collection_id).sponsor1629            }1630            Some(Call::transfer(_new_owner, collection_id, _item_id, _value)) => {1631                <Collection<T>>::get(collection_id).sponsor1632            }16331634            _ => T::AccountId::default(),1635        };16361637        let mut who_pays_fee: T::AccountId = sponsor.clone();1638        if sponsor == T::AccountId::default() {1639            who_pays_fee = who.clone();1640        }16411642        // Only mess with balances if fee is not zero.1643        if fee.is_zero() {1644            return Ok((fee, None));1645        }16461647        match <T as transaction_payment::Trait>::Currency::withdraw(1648            &who_pays_fee,1649            fee,1650            if tip.is_zero() {1651                WithdrawReason::TransactionPayment.into()1652            } else {1653                WithdrawReason::TransactionPayment | WithdrawReason::Tip1654            },1655            ExistenceRequirement::KeepAlive,1656        ) {1657            Ok(imbalance) => Ok((fee, Some(imbalance))),1658            Err(_) => Err(InvalidTransaction::Payment.into()),1659        }1660    }1661}16621663impl<T: Trait + transaction_payment::Trait + Send + Sync> SignedExtension1664    for ChargeTransactionPayment<T>1665where1666    BalanceOf<T>: Send + Sync + From<u64> + FixedPointOperand,1667    T::Call:1668        Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo> + IsSubType<Module<T>, T>,1669{1670    const IDENTIFIER: &'static str = "ChargeTransactionPayment";1671    type AccountId = T::AccountId;1672    type Call = T::Call;1673    type AdditionalSigned = ();1674    type Pre = (1675        BalanceOf<T>,1676        Self::AccountId,1677        Option<NegativeImbalanceOf<T>>,1678        BalanceOf<T>,1679    );1680    fn additional_signed(&self) -> sp_std::result::Result<(), TransactionValidityError> {1681        Ok(())1682    }16831684    fn validate(1685        &self,1686        who: &Self::AccountId,1687        call: &Self::Call,1688        info: &DispatchInfoOf<Self::Call>,1689        len: usize,1690    ) -> TransactionValidity {1691        let (fee, _) = self.withdraw_fee(who, call, info, len)?;16921693        let mut r = ValidTransaction::default();1694        // NOTE: we probably want to maximize the _fee (of any type) per weight unit_ here, which1695        // will be a bit more than setting the priority to tip. For now, this is enough.1696        r.priority = fee.saturated_into::<TransactionPriority>();1697        Ok(r)1698    }16991700    fn pre_dispatch(1701        self,1702        who: &Self::AccountId,1703        call: &Self::Call,1704        info: &DispatchInfoOf<Self::Call>,1705        len: usize,1706    ) -> Result<Self::Pre, TransactionValidityError> {1707        let (fee, imbalance) = self.withdraw_fee(who, call, info, len)?;1708        Ok((self.0, who.clone(), imbalance, fee))1709    }17101711    fn post_dispatch(1712        pre: Self::Pre,1713        info: &DispatchInfoOf<Self::Call>,1714        post_info: &PostDispatchInfoOf<Self::Call>,1715        len: usize,1716        _result: &DispatchResult,1717    ) -> Result<(), TransactionValidityError> {1718        let (tip, who, imbalance, fee) = pre;1719        if let Some(payed) = imbalance {1720            let actual_fee = <transaction_payment::Module<T>>::compute_actual_fee(1721                len as u32, info, post_info, tip,1722            );1723            let refund = fee.saturating_sub(actual_fee);1724            let actual_payment =1725                match <T as transaction_payment::Trait>::Currency::deposit_into_existing(1726                    &who, refund,1727                ) {1728                    Ok(refund_imbalance) => {1729                        // The refund cannot be larger than the up front payed max weight.1730                        // `PostDispatchInfo::calc_unspent` guards against such a case.1731                        match payed.offset(refund_imbalance) {1732                            Ok(actual_payment) => actual_payment,1733                            Err(_) => return Err(InvalidTransaction::Payment.into()),1734                        }1735                    }1736                    // We do not recreate the account using the refund. The up front payment1737                    // is gone in that case.1738                    Err(_) => payed,1739                };1740            let imbalances = actual_payment.split(tip);1741            <T as transaction_payment::Trait>::OnTransactionPayment::on_unbalanceds(1742                Some(imbalances.0).into_iter().chain(Some(imbalances.1)),1743            );1744        }1745        Ok(())1746    }1747}1748// #endregion