NFT教程:如何展示Flow和IPFS上的NFT收藏品

npx create-react-app pinata-party-frontend

npm i @onflow/fcl @onflow/types

REACT_APP_ACCESS_NODE=http://localhost:8080

REACT_APP_WALLET_DISCOVERY=https://fcl-discovery.onflow.org/testnet/authn

REACT_APP_CONTRACT_PROFILE=0xf8d6e0586b0a20c7

import {config} from "@onflow/fcl"

config()
.put("accessNode.api", process.env.REACT_APP_ACCESS_NODE) .put("challenge.handshake", process.env.REACT_APP_WALLET_DISCOVERY) .put("0xProfile", process.env.REACT_APP_CONTRACT_PROFILE)

import "./config"

import React, {useState, useEffect} from 'react'
import * as fcl from "@onflow/fcl"

const AuthCluster = () => {
  const [user, setUser] = useState({loggedIn: null})
  useEffect(() => fcl.currentUser().subscribe(setUser), [])
  if (user.loggedIn) {
    return (
      <div>
        <span>{user?.addr ?? "No Address"}</span>
        <button className="btn-primary" onClick={fcl.unauthenticate}>Log Out</button>
      </div>
    )
  } else {
    return (
      <div>
        <button className="btn-primary" onClick={fcl.logIn}>Log In</button>
        <button className="btn-secondary" onClick={fcl.signUp}>Sign Up</button>
      </div>
    )
  }
}

export default AuthCluster
//  rawAuthCluster.js 

import './App.css';
import AuthCluster from './AuthCluster';function App() {
  return (
    <div className="App">
      <AuthCluster />
    </div>
  );
}

export default App;

import PinataPartyContract from 0xf8d6e0586b0a20c7

pub fun main() : {String : String} {
    let nftOwner = getAccount(0xf8d6e0586b0a20c7)
    // log("NFT Owner")    
    let capability = nftOwner.getCapability<&{PinataPartyContract.NFTReceiver}>(/public/NFTReceiver)

    let receiverRef = capability.borrow()
        ?? panic("Could not borrow the receiver reference")

    return receiverRef.getMetadata(id: 1)
}

import React, { useState } from "react";
import * as fcl from "@onflow/fcl";

const TokenData = () => {
  const [nftInfo, setNftInfo] = useState(null)
  const fetchTokenData = async () => {
    const encoded = await fcl
      .send([
        fcl.script`
        import PinataPartyContract from 0xf8d6e0586b0a20c7
        pub fun main() : {String : String} {
          let nftOwner = getAccount(0xf8d6e0586b0a20c7)  
          let capability = nftOwner.getCapability<&{PinataPartyContract.NFTReceiver}>(/public/NFTReceiver)
      
          let receiverRef = capability.borrow()
              ?? panic("Could not borrow the receiver reference")
      
          return receiverRef.getMetadata(id: 1)
        }
      `
      ])
    
    const decoded = await fcl.decode(encoded)
    setNftInfo(decoded)
  };
  return (
    <div className="token-data">
      <div className="center">
        <button className="btn-primary" onClick={fetchTokenData}>Fetch Token Data</button>        
      </div>
      {
        nftInfo &&
        <div>
          {
            Object.keys(nftInfo).map(k => {
              return (
                <p>{k}: {nftInfo[k]}</p>
              )
            })
          }
          <button onClick={() => setNftInfo(null)} className="btn-secondary">Clear Token Info</button>
        </div>
      }
    </div>
  );
};

export default TokenData;

//rawTokenData.js  

.App {
  display: flex;
  flex-direction: column;
  min-height: 500px;
  justify-content: center;
  align-items: center;
}

button {
  padding: 10;
  height: 30px;
  min-width: 100px;
  cursor: pointer;
}

.btn-primary {
  border: none;
  background: rgb(255, 224, 0);
  color: #282828;
}

.btn-secondary {
  border: none;
  background: rgb(0, 190, 221);
  color: #282828;
}

.center {
  text-align: center;
}

.token-data {
  margin-top: 100px;
}

import './App.css';
import AuthCluster from './AuthCluster';
import TokenData from './TokenData';function App() {
  return (
    <div className="App">
      <AuthCluster />
      <TokenData />
    </div>
  );
}export default App;

import React, { useState } from "react";
import * as fcl from "@onflow/fcl";

const TokenData = () => {
  const [nftInfo, setNftInfo] = useState(null)
  const fetchTokenData = async () => {
    const encoded = await fcl
      .send([
        fcl.script`
        import PinataPartyContract from 0xf8d6e0586b0a20c7
        pub fun main() : {String : String} {
          let nftOwner = getAccount(0xf8d6e0586b0a20c7)  
          let capability = nftOwner.getCapability<&{PinataPartyContract.NFTReceiver}>(/public/NFTReceiver)
      
          let receiverRef = capability.borrow()
              ?? panic("Could not borrow the receiver reference")
      
          return receiverRef.getMetadata(id: 1)
        }
      `
      ])
    
    const decoded = await fcl.decode(encoded)
    setNftInfo(decoded)
  };
  return (
    <div className="token-data">
      <div className="center">
        <button className="btn-primary" onClick={fetchTokenData}>Fetch Token Data</button>        
      </div>
      {
        nftInfo &&
        <div>
          {
            Object.keys(nftInfo).map(k => {
              return (
                <p>{k}: {nftInfo[k]}</p>
              )
            })
          }
          <div className="center video">
            <video id="nft-video" canplaythrough controls width="85%">
              <source src={`https://ipfs.io/ipfs/${nftInfo["uri"].split("://")[1]}`}
                    type="video/mp4" />
            </video>
            <div>
              <button onClick={() => setNftInfo(null)} className="btn-secondary">Clear Token Info</button>
            </div>
          </div>          
        </div>
      }
    </div>
  );
};

export default TokenData;

//  rawTokenData.js