IPFS文件下载

Question

我想要检查是否有任何方法，我可以下载的IPFS文件，而不运行本地恶魔。我正在工作的Dapp，我将上传文件通过IPFS，并发送它的链接到各自的团队。我要那个团队下载文件。

Answer 1

您可以在DApp中添加npm库“ipfs”。

https://www.npmjs.com/package/ipfs

lib/ipfs.js

const IPFS = require('ipfs');
const node = new IPFS();

 /**
 * Function that uploads file onto IPFS
 * @param {JSON} fileDetails Json containing file details that needs to be 
   updated on IPFS
 * @param {function} callback callback function
 */
const uploadFileToIPFS = function(fileDetails, callback) {
    let fileContent = fs.readFileSync(fileDetails.path);
    node.files.add({
        path: fileDetails.originalname,
        content: fileContent
    }, (err, filesAdded) => {
        if (err) {
            return callback(err);
        }
        callback(null, {
            hash: filesAdded[0].hash
        });
    });
};


/**
 * Function that gets the document contents from IPFS, based on the document's hash
 * @param {String} ipfsHash IPFS hash of the document that is being uploaded onto IPFS
 * @param {function} callback callback function
 */
const getFileContentsFromIPFS = function(ipfsHash, callback) {
    node.files.cat(ipfsHash, function(err, data) {
        callback(err, data);
    });
};

routes/ipfs.js

// API that gets the documents from IPFS
router.get('/api/to/get/document/from/ipfs', function(req, res){
    ipfs.getFileContentsFromIPFS(req.query.ipfsHash, function(err, result){
        if (err) {
            res.json({
                status: 'error',
                message: 'Something went wrong while fetching document from IPFS'
            });
        } else {
            //Get the file type
            let isImageOrPdf = fileType(result);
            if (isImageOrPdf.ext == 'pdf') {
                res.writeHead(200,{
                    'Content-type': 'application/pdf'
                });
                res.end(result);
            } else if(isImageOrPdf.ext == 'png' || isImageOrPdf.ext == 'jpg' ){
                res.writeHead(200, {'Content-Type' : 'image/png'});
                res.end(result);
            }
        }
    });
});

而不是发送链接，而是发送文档的ipfsHash，每当他们想下载该文件时，获取ipfsHash并点击上面的API，该文件将被下载。

Answer 2

尝试http网关网关- IPFS新闻