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FileUpload.js
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FileUpload.js
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import React, { Component } from 'react';
import PropTypes from 'prop-types';
import styled from 'styled-components';
import IPFS from 'ipfs';
import { Buffer } from 'buffer';
import streamBuffers from 'stream-buffers';
const ProgressBar = styled.div`
width: ${props => ((props.progress || 0) / props.total * 130).toFixed(1)}px;
height: 20px;
background-color: #66ccff;
position: absolute;
left: 9px;
top: 10px;
`;
export default class FileUploadInput extends Component {
static propTypes = {
readAs: PropTypes.oneOf(['readAsDataURL', 'readAsArrayBuffer', 'readAsBinaryString', 'readAsText']),
onReadSuccess: PropTypes.func.isRequired,
onReadFailure: PropTypes.func.isRequired,
allowMultiple: PropTypes.bool,
validateFiles: PropTypes.func,
initialText: PropTypes.string,
inputProps: PropTypes.object,
fileInputProps: PropTypes.object,
};
static defaultProps = {
readAs: 'readAsArrayBuffer',
allowMultiple: false,
validateFiles: files => null,
initialText: '',
inputProps: {},
fileInputProps: {},
};
node: any;
stream: any;
state = {
progress: 0,
totalFileSize: 0,
};
constructor(props) {
super(props);
this.state = { text: props.initialText, files: [] };
// 用随机的仓库地址(IPFS 在本地缓存数据的地方)来初始化 IPFS 节点
const repoPath = 'ipfs-' + Math.random();
this.node = new IPFS({ repo: repoPath });
// 节点完成初始化并开始连接其他节点后会触发 ready 事件
this.node.on('ready', () => console.log('Online status: ', this.node.isOnline() ? 'online' : 'offline'));
}
/** 3.把文件丢进 IPFS 里 */
uploadIPFS = (fileArrayBuffer: ArrayBuffer): Promise<Buffer> => {
return new Promise((resolve, reject) => {
// 先设置进度条到 0 的位置
this.setState({ progress: 0 });
// 创建用于修改进度条进度的流
const myReadableStreamBuffer = new streamBuffers.ReadableStreamBuffer({
chunkSize: 25000, // 决定了传输速率
});
// 修改进度条进度
myReadableStreamBuffer.on('data', (chunk: Buffer) => {
this.setState({ progress: this.state.progress + chunk.byteLength });
myReadableStreamBuffer.resume();
});
// 创建 IPFS 读写文件的流,这是一个 Duplex 流,可读可写
this.stream = this.node.files.addReadableStream();
// 文件上传完毕后 resolve 这个 Promise
this.stream.on('data', (file: Buffer) => resolve(file));
// 对接好两个流,并开始上传
this.stream.write(myReadableStreamBuffer);
myReadableStreamBuffer.put(Buffer.from(fileArrayBuffer));
// 上传完毕后关闭流
myReadableStreamBuffer.on('end', () => this.stream.end());
myReadableStreamBuffer.stop();
});
};
/** 2.中转文件,准备丢进 IPFS */
readFile(file) {
return new Promise((resolve, reject) => {
const fileReader = new FileReader();
fileReader.onload = event => resolve(this.uploadIPFS(event.target.result));
fileReader.onerror = reject;
fileReader[this.props.readAs](file);
});
}
/** 清空显示的文本和暂存在 <input/> 里的文件 */
resetState() {
this.setState({ text: '', files: [] });
}
/** 1.从 <input/> 元素获取文件 */
async handleChange(event: SyntheticInputEvent<EventTarget>) {
// 处理取文件的各种意外情况
const files: File[] = Array.from(event.target.files);
if (!files.length) {
return this.resetState();
}
const errMsg = this.props.validateFiles(files);
if (errMsg) {
this.resetState();
return this.props.onReadFailure(errMsg);
}
// 更新显示的文件名
const text = files.length > 1 ? `${files.length} files...` : files[0].name;
this.setState({ text, files });
// 先计算文件的总大小,用于进度条
let totalFileSize = 0;
files.forEach(file => {
totalFileSize += file.size;
});
this.setState({ totalFileSize });
// 调用上传文件的函数
try {
const response = await Promise.all([...files.map(aFile => this.readFile(aFile))]);
this.props.onReadSuccess(response);
} catch (err) {
this.resetState();
this.props.onReadFailure(err.message);
}
}
render() {
return (
<span className={this.props.className}>
{/* 用于显示文件名的 input */}
<input
placeholder={this.props.allowMultiple ? 'Select files' : 'Select a file'}
value={this.state.text}
readOnly
onClick={() => this.fileInput.click()}
{...this.props.inputProps}
/>
{/* 用于放置文件对象的 input,因为样式比较丑,不让它显示 */}
<input
style={{ display: 'none' }}
ref={el => (this.fileInput = el)}
type="file"
multiple={this.props.allowMultiple}
onChange={e => this.handleChange(e)}
{...this.props.fileInputProps}
/>
<ProgressBar progress={this.state.progress} total={this.state.totalFileSize} />
</span>
);
}
}