I'm trying to post a base64-encoded PDF file to a Zendesk file upload API endpoint but the file URL returned from the API shows that the file is corrupted.
First I receive the PDF as a base64-encoded string from a separate API call. Let's call it base64String.
If I do window.open("data:application/pdf;base64," + base64String) I can view the PDF in my browser.
Now I am trying to follow the documentation here for uploading files via the API. I can successfully complete a cURL call as shown in the example. However, the jQuery AJAX call will corrupt the PDF file.
client.request({
url: '/api/v2/uploads.json?filename=test.pdf',
type: 'POST',
data: atob(base64String),
contentType: 'application/binary'
}).then(function(data) {
window.open(data.upload.attachment.content_url); // corrupt file
}, function(response) {
console.log("Failed to upload file to Zendesk.");
console.log(response);
});
Like I said, this will succeed but when I visit the content_url the PDF does not display. I am quite sure the file is being corrupt in the POST request.
I have tried uploading the file as a base64 string (without decoding with atob()) with no luck among other things.
UPDATE
I'm still not able to view the PDF after converting the base64 string to blob.
var blob = base64ToBlob(base64String);
console.log(blob); // Blob {size:39574, type: "application/pdf"}
client.request({
url: '/api/v2/uploads.json?filename=test.pdf',
type: 'POST',
data: blob,
processData: false,
contentType: 'application/pdf'
}).then(function(data) {
window.open(data.upload.attachment.content_url); // corrupt file
}, function(response) {
console.log("Failed to upload file to Zendesk.");
console.log(response);
});
function base64ToBlob(byteString) {
// write the bytes of the string to an ArrayBuffer
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
// write the ArrayBuffer to a blob, and you're done
var blob = new Blob([ab], {type: 'application/pdf'});
return blob;
};
I learned that the Zendesk app framework uses a jQuery AJAX wrapper for requests and the arraybuffer type is unsupported, so the file was getting corrupted. The app framework team has fixed the issue.
Related
I'm getting a PDF file from an external web resource using ajax.
I want to store this PDF in the google drive using google script API from within google docs.
Sample of that ajax call:
$.ajax({
url: "<fancyurl>",
contentType: 'application/octet-stream',
responsetype: 'blob',
type: 'GET',
success: function(response) {
// or converted response.. etc..
google.script.run.withSuccessHandler(yay).withUserObject(this).createFile(response);
});
The response from the webresource is an octet-stream:
I've tried to import the original response, the response converted to blob, a uint8 blob and the base64string. All end up in errors or corrupt files.
var blob = Utilities.newBlob(data, 'application/pdf' ,'asdf.pdf');
// blob.setName('asdf.pdf');
// blob.setContentTypeFromExtension();
DriveApp.createFile(blob);
Where data is the response or converted response.
Does anybody know how to solve this or what google script expects as a valid input?
In my experience, when the binary data is retrieved using ajax, the binary data is converted to the text data. By this, I'm worried that responsetype of blob and arraybuffer might not be able to be used. I thought that this might be the reason of your issue. So, in this answer, I would like to propose using "XMLHttpRequest" instead of "ajax".
The modified script is as follows.
Modified script:
From:
$.ajax({
url: "<fancyurl>",
contentType: 'application/octet-stream',
responsetype: 'blob',
type: 'GET',
success: function(response) {
// or converted response.. etc..
google.script.run.withSuccessHandler(yay).withUserObject(this).createFile(response);
});
To:
const xhr = new XMLHttpRequest();
xhr.open('GET', "<fancyurl>", true);
xhr.responseType = 'arraybuffer';
xhr.onload = function(e) {
google.script.run.withSuccessHandler(yay).withUserObject(this).createFile([...new Int8Array(this.response)]);
};
xhr.send();
In this modification, the binary data is converted to the array buffer and converted it to int8 array. By this, this data can be used as the byte array with Google Apps Script.
In this case, although I cannot see your whole script of Google Apps Script, you can use your Google Apps Script as follows.
function createFile(data) {
var blob = Utilities.newBlob(data, 'application/pdf', 'asdf.pdf');
DriveApp.createFile(blob);
}
I'm trying to download an Excel file via AJAX (using Axios). I'm doing this way because I need to send a JWT token to access to it.
Now, I'm getting a file response with the content like this:
Which seems to be binary. In Postman I can set the token and click Save and download button and all works. Now, this is my code in JS:
requestWithFullResponse({
url: url,
method: 'GET',
}, this.props.token, false).then((response) => {
const responseData = response.data
// I've tried with different types and nothing works
// var blob = new Blob([responseData], { type: `${response.headers['content-type']};charset=utf-8` });
// var blob = new Blob([responseData], { type: 'application/octet-stream;charset=utf-8' });
var blob = new Blob([responseData], { type: 'application/octet-stream' });
saveAs(blob, filename, true)
}).catch((error) => { console.log('Error downloading file -> ', error); });
That code downloads the file, but when I open It it Libre Office says that the file is corrupt. What I'm missing? Is there a way to see the code executed by Postman when downloads the file?
Any kind of help would be really appreciated
You need to set: responseType: 'blob'. The default is application/json.
I used https://github.com/barryvdh/laravel-dompdf
stream method for sending a response to front-end.
Here is my code which I wrote for opening pdf in a new tab.I'm calling stream from backend API in result it gives a response but when I try to create blob it shows nothing in PDF.
APICaller({
method: 'get',
responseType: "arraybuffer",
headers: {
'Accept': 'application/pdf'
},
endpoint: gep('generate/certificate?path=certificate.pdf', 'v3'),
}).then( (data) => {
var file = new Blob([data.data], {type: 'application/pdf'});
var fileURL = URL.createObjectURL(file);
window.open(fileURL);
});
here is Empty PDF
I had a similar issue with axios, it doesn't work for downloading files using Blob. Use XMLHttpRequest and do the similar response handler in its on('load') event to achieve file download.
I'm invoking an api that accepts image in the binary representation form. I'm uploading the image through a file upload html.
Here is my code:
let fileReader = new FileReader();
let fileData = fileReader.readAsArrayBuffer(text.data.uploadedFile);
yield call(fetchJson, 'url/fetch', {
method: 'POST',
headers: {
Authentication: 'Basic <key>',
'Content-type': 'image/jpeg'
},
body: fileData
});
I get fileData as undefined and my request does not go through. This 3rd party API accepts image in binary representation form in the body.
This is equivalent to the following in POSTMAN:
This works in POSTMAN but not sure how to achieve this using code.
I set uploadedFile on front-end using: event.target.files[0]
I am trying to send an Excel file from my local machine to our webservice.
In my view, I am using input type "file" to select the file, and then I send that file to this webservice call:
uploadArticles: function (file, filename) {
var fd = new FormData();
fd.append('UPLOADFILE', file);
fd.append('APPNAME', 'MY_APP');
fd.append('PRGNAME', 'UPLOAD_EXCEL');
fd.append('SESSIONID', '12345');
fd.append('UPDATE', 'Y');
fd.append('UPLOADFILENAME', filename);
fd.append('ARGUMENTS', 'SESIONID,UPLOADFILE,UPLOADFILENAME,UPDATE');
$http.post(MAGIC_URL, fd, {
transformRequest: angular.identity,
headers: {'Content-Type': undefined}
}).success(function (response) {
console.log('SUCCESS! ', response);
}).error(function (response) {
console.log('ERROR! ', response);
});
}
We are using uniPaaS to take ARGUMENTS file blob and write it to a directory on our server. It is working properly, however when I try to open the file itself, the blob text is being written inside of the Excel file. It is almost as if the file is not interpreted properly.
Here's an example of what is inside of the Excel file:
data:text/rtf;base64,e1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcY29jb2FydGYxNDA0XGNvY29hc3VicnRmNDcwCntcZm9udHRibFxmMFxmc3dpc3NcZmNoYXJzZXQwIEhlbHZldGljYTt9CntcY29sb3J0Ymw7XHJlZDI1NVxncmVlbjI1NVxibHVlMjU1O30KXG1hcmdsMTQ0MFxtYXJncjE0NDBcdmlld3cxMDgwMFx2aWV3aDg0MDBcdmlld2tpbmQwClxwYXJkXHR4NzIwXHR4MTQ0MFx0eDIxNjBcdHgyODgwXHR4MzYwMFx0eDQzMjBcdHg1MDQwXHR4NTc2MFx0eDY0ODBcdHg3MjAwXHR4NzkyMFx0eDg2NDBccGFyZGlybmF0dXJhbFxwYXJ0aWdodGVuZmFjdG9yMAoKXGYwXGZzMjQgXGNmMCB0ZXN0IDEyMzR9
Am I approaching this file upload improperly?
EDIT:
I was able to resolve this. uniPaaS has the ability to transform Base64 to Blobs, but this was not working properly for whatever reason. I was able to convert this Base64 to a Blob using JavaScript, I sent the blob to uniPaaS, and the file was written properly.
For anyone else running into this issue, please see this discussion: Creating a Blob from a base64 string in JavaScript