[英]How to convert base64 stream into string and write into another file?
我正在從電子郵件正文獲取消息流,該流采用 base64 格式,我想對流進行解碼。我使用的是 npm 模塊“base64-stream”來解碼流,但出現錯誤。
類型錯誤:base64.decode 不是函數
function buildAttMessageFunction(attachment) {
var filename = attachment.params.name;
var encoding = attachment.encoding;
return function (msg, seqno) {
var prefix = '(#' + seqno + ') ';
msg.on('body', function(stream, info) {
//Create a write stream so that we can stream the attachment to file;
console.log(prefix + 'Streaming this attachment to file', filename, info);
var writeStream = fs.createWriteStream(filename);
writeStream.on('finish', function() {
console.log(prefix + 'Done writing to file %s', filename);
});
//stream.pipe(writeStream); this would write base64 data to the file.
//so we decode during streaming using
if (toUpper(encoding) === 'BASE64') {
//the stream is base64 encoded, so here the stream is decode on the fly and piped to the write stream (file)
stream.pipe(base64.decode()).pipe(writeStream);
} else {
//here we have none or some other decoding streamed directly to the file which renders it useless probably
stream.pipe(writeStream);
}
});
msg.once('end', function() {
console.log(prefix + 'Finished attachment %s', filename);
});
};
}
我想你需要用這種方式
const {Base64Decode} = require("base64-stream");
stream.pipe(new Base64Decode()).pipe(writeStream);
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