在NodeJS中将上传的文件保存到Pinata IPFS中

Question

我一直试图将上传的图像文件保存到NodeJs中的IPFS中，虽然皮纳塔似乎保存了这些文件，但这些文件几乎是胡说八道(下载后图像被破坏了)。

我的代码：

// Nodejs route.
exports.postImage = async (req, res, next) => {
    // Using multer to get the file.
    fileUploadMiddleware(req, res, async (err) => {
        // getting bunch of data from query string.
        let meta = {
            origin,
            originid,
            context,
            ownerid,
            format
        } = req.query;

        if(!meta.format || !req.files) {
            return next(new ErrorResponse("File format not specified", 404));
        }

        if(!meta.originid) {
            meta.originid = uuidv4();
        }        
        
        // NOTE: is this the right way to get the data of the file ?
        const buffer = req.files[0].buffer;
        
 const filename = `${metadata.origin}_${metadata.originid}.${ metadata.format }`;

    let stream;
    try {
        stream = Readable.from(buffer);
        // HACK to make PINATA WORK.
        stream.path = filename;
    }
    catch(e) {
        logger.logError(e);
        return false;
    }

    const options = {
        pinataMetadata: {
            name: filename,
            keyvalues: {
                context: metadata.context,
                ownerid: metadata.ownerid
            }
        },
        pinataOptions: {
            cidVersion: 0
        }
    };

    try {
        var result = await pinata.pinFileToIPFS(stream, options);
        console.log("SUCCESS ", result);

        return result;
    }
    catch(e) {
        logger.logError(e);
        return null;
    }

        res.status(200).json({
            success: true,
            data: 'You got access'
        })
    });
}

因此，基本上是基于上传的文件缓冲区创建流，并将其发送到Pinata。我哪里出问题了？

Answer 1

const buffer = req.files[0].buffer;

如果你使用MemoryStorage。缓冲区属性将可用。它不能用于diskStorage，因为它将在本地保存该文件。

const storage = multer.memoryStorage()
const upload = multer({ storage: storage })

而且我认为这不是req.files[0]

const buffer = req.file.buffer;

获得缓冲区后，使用FormData npm包将其转换为表格数据：

   import FormData from "form-data";

   const formData = new FormData();
      formData.append("file", buffer, {
         contentType,
        filename: fileName + "-" + uuidv4(),
      });

然后你给皮纳塔发了个邮件请求

  const url = `https://api.pinata.cloud/pinning/pinFileToIPFS`;
  const fileRes = await axios.post(url, formData, {
    maxBodyLength: Infinity,
    headers: {
      // formData.getBoundary() is specific to npm package. native javascript FormData does not have this method
      "Content-Type": `multipart/form-data: boundary=${formData.getBoundary()}`,
      pinata_api_key: pinataApiKey,
      pinata_secret_api_key: pinataSecretApiKey,
    },
  });