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@tomduncalf
Last active December 17, 2022 02:52
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How to upload a local (iOS filesystem) file to S3 using React Native with temporary credentials
/**
* I recently needed to upload a file from the phone's filesystem to S3 using temporary credentials
* (i.e. access key, secret key and session token) issued by an API for a React Native application,
* without the overhead of Base64 encoding the file and passing it over the bridge (as it could be
* several MB big), and wanted to avoid writing native code to do this.
*
* None of the S3 libraries online worked with the temporary credentials, but I figured out a
* solution using the official AWS SDK (which is good, as it supports all the relevant authentication
* out of the box) and the react-native-fetch-blob module, which allows you to upload directly from the
* filesystem with the correct Content-type header (as far as I can tell, React Native's fetch only
* allows multipart/form-data, which was causing the pre-signed URL signature check to fail).
*
* Below is a skeleton version, which requires the aws-sdk and react-native-fetch-blob npm modules.
*/
import AWS from 'aws-sdk/dist/aws-sdk-react-native';
import RNFetchBlob from 'react-native-fetch-blob'
const uploadFile = async (localPath, contentType, region, accessKeyId, secretAccessKey, sessionToken, bucket, key) => {
try {
// Configure the AWS SDK with the credentials
AWS.config.update({
region,
accessKeyId,
secretAccessKey,
sessionToken,
});
// Create a new instance of the S3 API
const s3 = new AWS.S3();
const s3Url = await s3.getSignedUrl('putObject', {
Bucket: bucket,
Key: key,
ContentType: contentType,
});
const result = await RNFetchBlob.fetch('PUT', s3Url, {
'Content-Type': contentType
}, RNFetchBlob.wrap(localPath));
} catch (e) {
console.error('Error', e);
}
}
@yannoudou
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thanks, sir !

@eyalabadi98
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Hey, Can you show how you got your Session token?

What was the API you called to obtain it?

@im-aditya
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I am getting this error:

Write error: ssl=0x7ab6d7de88: I/O error during system call, Connection reset by peer

Any idea ?

@tomduncalf
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Author

Hmm, no idea, sorry. Not used this code for ages!

@omatrot
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omatrot commented Apr 15, 2020

This is an old one but:
A call sample would have been much appreciated.
Also the call to obtain the temporary credentials would be interesting in my case.

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