Why can't I extract a zip file from a POST request?
I have a piece of client side code that exports a .docx file from Google Drive and sends the data to my server. It's pretty straight forward, it just exports the file, makes it into a blob, and sends the blob to a POST endpoint.
gapi.client.drive.files.export({
fileId: file_id,
mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
}).then(function (response) {
// the zip file data is now in response.body
var blob = new Blob([response.body], {type: "application/vnd.openxmlformats-officedocument.wordprocessingml.document"});
// send the blob to the server to extract
var request = new XMLHttpRequest();
request.open('POST', 'return-xml.php', true);
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
request.onload = function() {
// the extracted data is in the request.responseText
// do something with it
};
request.send(blob);
});
Here is my server side code to save this file onto my server so I can do things with it:
<?php
file_put_contents('tmp/document.docx', fopen('php://input', 'r'));
When I run this, the file is created on my server. However, I believe it is corrupted, because when I try to unzip it (as you can do with .docx), this happens:
$ mv tmp/document.docx tmp/document.zip
$ unzip tmp/document.zip
Archive: document.zip
error [document.zip]: missing 192760059 bytes in zipfile
(attempting to process anyway)
error [document.zip]: start of central directory not found;
zipfile corrupt.
(please check that you have transferred or created the zipfile in the
appropriate BINARY mode and that you have compiled UnZip properly)
Why isn't it recognizing it as a proper .zip file?
You should first download the original zip, and compare its content to that what yhou receive on you server, you can do this e.gg. with totalcommander or line "diff" command.
When you do this, you will see if your zip is change during transfer. With this information you can continue searching WHY it is changed. Eg when in you zipfile ascii 10 is transformed to "13" or "10 13" it could be a line ending problem on the file transfer
Because when you open files in php with fopen(..., 'r') it can happen, that n signs are transformed when you are using windows, you could try to use fopen(..., 'rb') wich enforces BINARY reading a file without transfering line endings.
@see: https://stackoverflow.com/a/7652022/2377961
@see php documentation fopen
I think it may depends by that "application/x-www-form-urlencoded". So when you read the request data with php://input it saves also some http property, so the .zip it's corrupted. Try to open the .zip file and look at what there is inside. To fix, if the problem is what I said before try to change the Contenent-type to application/octet-stream.
I would suggest using base64 to encode the binary data into a text stream before posting, I've done this before and it works well, using url encoding for binary data isn't going to work. Then on your server you base 64 decode to convert back to binary before storing.
Once its in base64 you can post it as text.
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