尝试使用带有 Javascript 的 Playwright 下载 .xlsx 文件并上传到 Azure Blob 存储会生成带有错误标头的格式错误的 .xlsx 文件

Question

I am trying to download an excel file and then upload it to Azure Blob Storage for use in Azure Data Factory. I have a playwright javascript that worked when the file was a .csv but when I try the same code with an excel file, it will not open in Excel. It says, "We found a problem with some content in 'order_copy.xlsx'. Do you want us to try to recover as much as we can?: After clicking yes, it says, "Excel cannot open the file 'order_copy.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file."

Any ideas on how to use the createReadStream more effectively to do this and preserve the .xlsx format?

I don't think the saveAs method will work since this code is being executed in an Azure Function with no access to a local known path.

My first thought was the content type was not right, so I set that, but it still did not work. I tried a UTF-8 encoder but that also did not work.

//const data = await streamToText(download_csv.createReadStream())             
const download_reader = await download_csv.createReadStream();
let data = '';
for await (const chunk of download_reader) {
    data += chunk; //---I suspect I need to do something different here
}
// const data_utf8 = utf8.encode(data) //unescape( encodeURIComponent(data) );

const AZURE_STORAGE_CONNECTION_STRING = "..." //---Removed string here
// Create the BlobServiceClient object which will be used to create a container client
const blob_service_client = BlobServiceClient.fromConnectionString(AZURE_STORAGE_CONNECTION_STRING); 
// Get a reference to a container
const container_client = blob_service_client.getContainerClient('order'); 
const blob_name = 'order_copy.xlsx';
// Get a block blob client
const block_blob_client = container_client.getBlockBlobClient(blob_name);        
const contentType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
const blobOptions = { blobHTTPHeaders: { blobContentType: contentType } };        
//const uploadBlobResponse = await block_blob_client.upload(data_utf8, data_utf8.length, blobOptions);
const uploadBlobResponse = await block_blob_client.upload(data, data.length, blobOptions);
console.log("Blob was uploaded successfully. requestId: ", uploadBlobResponse.requestId);

Any guidance would be appreciated. Thank you in advance for your help!

-Chad

Answer 1

Thanks @Gaurav for the suggestion on not setting the data to a string. The following code worked after I changed to using a array of the chunks and concatenated it using the Buffer similar to your suggested code.

let chunks = []
for await (const chunk of download_reader) {
    chunks.push(chunk)
}
const fileBuffer = Buffer.concat(chunks)
...
const uploadBlobResponse = await block_blob_client.upload(fileBuffer, fileBuffer.length, blobOptions);

Thanks everyone!