File size

Hey,

is there a way to get the length of the stream? (size of the uploaded file)

😄

[dizlexik]

It actually would be nice to have access to the file size that the client reports even if it is possible for them to lie about it. In the vast majority of cases it will be accurate and it would be nice to use it in the maxFileSize validation to short-circuit the process and avoid needlessly pulling in maxFileSize bytes of data before erroring out. This would be desired behavior even if the client misreports the size, e.g. if they lie and say the file is bigger than it really is then we would still want to throw an error and now allow it. And if they lie and underreport then it will still error out once the uploaded bytes reaches maxFileSize.

[mike-marcacci]

@jaydenseric is correct that it’s just an implementation detail, and in the future we may do something like buffer to memory up to a certain size, then fall back to the file system. However, if we end up going with #92 as written (it’s still a WIP) you would have access to the writable stream (the capacitor property), and could listen for its finish event and use its bytesWritten property to get size. I don’t think we want to document the capacitor property as parts of our public API just yet, so you would need to more strictly pin your version if you chose to use that strategy, but it would let you do what you want very efficiently.