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Merge pull request #38 from 4-point-0/rimatik/near-provider-buy-for-user
added nearProviderService with buy_for_user method
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| import { Injectable, Logger } from '@nestjs/common'; | ||
| import { ConfigService } from '@nestjs/config'; | ||
| import { BN } from 'bn.js'; | ||
| import * as nearAPI from 'near-api-js'; | ||
|
|
||
| /* It's a service that connects to the NEAR blockchain and provides methods for interacting with the NFT contract */ | ||
| @Injectable() | ||
| export class NearProviderService { | ||
| private readonly logger = new Logger(NearProviderService.name); | ||
|
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| // NEAR network ID (e.g. localnet, betanet, testnet, mainnet). For us it's testnet or mainnet | ||
| private networkId: string; | ||
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| // NEAR account ID of the contract that will have NFTs | ||
| private nftContractAccountId: string; | ||
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| // NEAR account ID of the account that will pay to mint NFTs | ||
| private masterAccountId: string; | ||
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| // NEAR account private key of the account that will pay to mint NFTs | ||
| private masterAccountPrivateKey: string; | ||
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| // NEAR config | ||
| private config: nearAPI.ConnectConfig; | ||
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| // NEAR instance | ||
| private near: nearAPI.Near | null; | ||
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| // NEAR account instance of the master account that will call contract to mint NFTs | ||
| private masterAccount: nearAPI.Account | null; | ||
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| // NEAR key store | ||
| private keyStore = new nearAPI.keyStores.InMemoryKeyStore(); | ||
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| // Boatload of gas to pay for minting/burning NFTs (300 Tgas). We don't care about this gas because NEAR will refund unused gas | ||
| private gas = new BN('300000000000000'); | ||
|
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| /** | ||
| * We're creating a constructor function that takes in a configService object as a parameter using dependecy injection. We're | ||
| * then setting the networkId, nftContractAccountId, masterAccountId, and masterAccountPrivateKey to | ||
| * the values that we get from the configService object | ||
| * @param {ConfigService} configService - This is a service that we'll use to get the configuration | ||
| * values from the .env file. | ||
| */ | ||
| constructor(private readonly configService: ConfigService) { | ||
| this.networkId = this.configService.get('near.network_id'); | ||
| this.nftContractAccountId = this.configService.get( | ||
| 'near.nft_contract_account_id', | ||
| ); | ||
| this.masterAccountId = this.configService.get('near.master_account_id'); | ||
| this.masterAccountPrivateKey = this.configService.get( | ||
| 'near.master_account_private_key', | ||
| ); | ||
|
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| this.near = null; | ||
| this.masterAccount = null; | ||
| } | ||
|
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| async onModuleInit() { | ||
| await this.init(); | ||
| } | ||
|
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| /** | ||
| * It connects to the NEAR blockchain and sets up the master account | ||
| */ | ||
| private async init() { | ||
| if (this.near && this.masterAccount) return; | ||
|
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| this.config = { | ||
| networkId: this.networkId, | ||
| nodeUrl: `https://rpc.${this.networkId}.near.org`, | ||
| walletUrl: `https://wallet.${this.networkId}.near.org`, | ||
| helperUrl: `https://helper.${this.networkId}.near.org`, | ||
| }; | ||
|
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| const masterAccountKeyPair = nearAPI.KeyPair.fromString( | ||
| this.masterAccountPrivateKey, | ||
| ); | ||
|
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| await this.keyStore.setKey( | ||
| this.config.networkId, | ||
| this.masterAccountId, | ||
| masterAccountKeyPair, | ||
| ); | ||
|
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| this.near = await nearAPI.connect({ | ||
| ...this.config, | ||
| keyStore: this.keyStore, | ||
| }); | ||
|
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| this.masterAccount = await this.near.account(this.masterAccountId); | ||
| } | ||
|
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| /** | ||
| * It buys NFT by tokenId for given accountId | ||
| * @param {string} tokenId - The token ID of the NFT you want to buy. | ||
| * @param {string} accountId - The account ID of the account that wants to buy. | ||
| * @returns A boolean value. | ||
| */ | ||
| async buyForUser(tokenId: string, accountId: string): Promise<boolean> { | ||
| try { | ||
| await this.masterAccount.functionCall({ | ||
| contractId: this.nftContractAccountId, | ||
| methodName: 'buy_for_user', | ||
| args: { | ||
| tokenId: tokenId, | ||
| accountId: accountId, | ||
| }, | ||
| gas: this.gas, | ||
| attachedDeposit: '0' as any, | ||
| }); | ||
|
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| return true; | ||
| } catch (error) { | ||
| this.logger.error('Error executing contract function call: ', error); | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
| } |
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