Multiple file uploads to Cloudinary with Axios in React - reactjs

Question

I have tried implementing the superagent way of uploading multiple files in axios. But somehow, I'm getting an error in console
Failed to load https://api.cloudinary.com/v1_1/xxxx/image/upload:
Request header field Authorization is not allowed by
Access-Control-Allow-Headers in preflight response.
My upload handler looks like this
uploadFile(){
const uploaders = this.state.filesToBeSent.map(file => {
const formData = new FormData();
formData.append("file", file);
formData.append("upload_preset", "xxxxx");
formData.append("api_key", "xxxxx");
formData.append("timestamp", (Date.now() / 1000) | 0);
return axios.post(url, formData, {
headers: { "X-Requested-With": "XMLHttpRequest" },
}).then(response => {
const data = response.data;
const fileURL = data.secure_url
console.log(data);
})
});
// Once all the files are uploaded
axios.all(uploaders).then(() => {
// ... perform after upload is successful operation
console.log("upload completed ", uploaders);
});
}
I have got this example from here
Another thing is confusing to me. In superagent we can attach parameters to the request field which includes API Secret Key of Cloudinary like this:
const paramsStr = 'timestamp='+timestamp+'&upload_preset='+uploadPreset+secretKey;
const signature = sha1(paramsStr);
const params = {
'api_key': 'xxxx',
'timestamp': timestamp,
'upload_preset': uploadPreset,
'signature': signature
}
Object.keys(params).forEach(key => {
uploadRequest.field(key, params[key])
});
But in that example, it is not mentioned how to append the secret key and other params to axios.

Answer 1

You will need to generate the signature on your backend, and then perform the upload with the generated signature.
You can generate a signature via the following instructions- https://support.cloudinary.com/hc/en-us/articles/203817991-How-to-generate-a-Cloudinary-signature-on-my-own-
You can also take a look at the following example on how to append the signature to your request. It's in PHP, however, the guidelines still apply.
https://gist.github.com/taragano/a000965b1514befbaa03a24e32efdfe5