I'm currently trying to store all gmail emails attachement, witch are encoded in base64url (https://developers.google.com/gmail/api/v1/reference/users/messages/attachments).
gmail.users.messages.attachments.get({
'auth': auth,
'userId': 'me',
'id': 'attachementId',
"messageId": 'messageId'
}, function(err, response, seg) {
if (err) {
//
} else {
var base64_attachement = response.data.replace(/-/g, '+').replace(/_/g, '/').replace(/ /g, '+');
var buffer = new Buffer(base64_attachement, "base64");
var attachementDecode = buffer.toString();
}
});
But when i store the message in a file or in my S3 and I try to read it (with the good format) I can't see anything, and images editors as gimp say thats the image is corrupted. What am I doing wrong ? I'm really lost how can I decode a google attachement in base64url format ?
I get also attachment from gmail and success to save them : set the base-64 in Blob object and then you could use FileSaver library to save the file in your computer easily.
Code:
var base64=(response.data).replace(/_/g, '/'); //Replace this characters
base64=base64.replace(/-/g, '+');
var base64Fixed = fixBase64(base64);
var blob = new Blob([base64Fixed], { type: "image/png" } ); //set your file type!
saveAs(blob,"name of file"); //Using FileSaver library
function fixBase64(binaryData) {
var base64str = binaryData// base64 string from thr response of server
var binary = atob(base64str.replace(/\s/g, ''));// decode base64 string, remove space for IE compatibility
var len = binary.length; // get binary length
var buffer = new ArrayBuffer(len); // create ArrayBuffer with binary length
var view = new Uint8Array(buffer); // create 8-bit Array
// save unicode of binary data into 8-bit Array
for (var i = 0; i < len; i++)
view[i] = binary.charCodeAt(i);
return view;
}
Hope that it's will help you. Good luck