Develop Reference

Uploading Audio to Cloudinary

this is my first Stack Overflow post so please go easy on me!
I'm building an audio recording app using EXPO as the SDK with React Native. One of the main features of the app is to be able to to record live audio as well as uploading audio from the client's device. By leveraging Expo's Audio API and FileSystem, I'm successfully able to record and save live audio and then retrieve it via FileSystem to upload, however I'm running in an error when I try to pass the localUri to upload to my Cloudinary database. There is very little documentation in regards to audio and audio uploads to cloudinary are clumped into video uploads so there's nothing audio specific to really point me in the right direction. I've tried converting the URI to base64 as well as a variety of MIME types but the response from Cloudinary with a secure url returns empty/undefined. I've successfully uploaded images with this method so you can imagine how frustrating it is. Here's my code that grabs a recording and tries to upload it to Cloudinary:
DocumentPicker.getDocumentAsync({
type: '*/*',
copyToCacheDirectory: true,
base64: true
})
.then(succ => {
//check out the saved info
console.log(succ, `path: ${succ.uri}, type: ${succ.type}, name: ${succ.id}, size: ${succ.size}`)
let Base64 = {/* Truncated Base64 object*/};
let base64Aud = `data:audio/x-wav;base64, ${Base64.encode(succ.uri)}`;
let cloud = `https://api.cloudinary.com/v1_1/${CLOUD_NAME}/upload`;
const data = {
'file': base64Aud,
'upload_preset': CLOUDINARY_UPLOAD_PRESET,
'resource_type': 'video',
}
fetch(cloud, {
body: JSON.stringify(data),
headers: {
'content-type': 'application/x-www-form-urlencoded'
},
method: 'POST',
})
.then(async r => {
let data = await r.json()
console.log('cloudinary url:', data.secure_url)
return data.secure_url
})
.catch(err => console.log(err))
}
This call prints the following to the console:
Object {
"name": "20200117_143416.mp4",
"size": 519612343,
"type": "success",
"uri": "file:///data/user/0/host.exp.exponent/cache/ExperienceData/%2540anonymous%252Faloud-aaf24bff-8000-47f0-9d1c-0893b81c3cbc/DocumentPicker/c922deb7-fd4f-42d9-9c28-d4f1b4990a4c.mp4",
} path: file:///data/user/0/host.exp.exponent/cache/ExperienceData/%2540anonymous%252Faloud-aaf24bff-8000-47f0-9d1c-0893b81c3cbc/DocumentPicker/c922deb7-fd4f-42d9-9c28-d4f1b4990a4c.mp4, type: success, name: undefined, size: 519612343
data:audio/x-wav;base64, ZmlsZTovLy9kYXRhL3VzZXIvMC9ob3N0LmV4cC5leHBvbmVudC9jYWNoZS9FeHBlcmllbmNlRGF0YS8lMjU0MGFub255bW91cyUyNTJGYWxvdWQtYWFmMjRiZmYtODAwMC00N2YwLTlkMWMtMDg5M2I4MWMzY2JjL0RvY3VtZW50UGlja2VyL2M5MjJkZWI3LWZkNGYtNDJkOS05YzI4LWQ0ZjFiNDk5MGE0Yy5tcDQ=
cloudinary url: undefined
Does anyone see any glaring issues or have any insight on this issue? Better yet, successfully uploaded audio to Cloudinary from the client using Expo & React Native? Thanks!

While I can't say for certain why the uploads fail in your case without seeing the error returned by Cloudinary, I have created a working JSFiddle which you can use to upload a Base64 data URI encoded audio file (1-second audio in my example to keep it short). Just replace your cloud name in the API endpoint URL and set the upload preset. Once that uploads successfully in your account you can replace the example with your Base64 Data URI and see if it works or not. That will tell you if the issue is with the Base64 String itself. Having said that, sharing the error returned by Cloudinary would be the best indicator.
Example code below:
var fd = new FormData();
fd.append("file", "data:audio/mpeg;base64,SUQzBAAAAAABBFRYWFgAAAASAAADbWFqb3JfYnJhbmQ...");
fd.append("upload_preset", "");
fd.append("resource_type", "video")
fetch('https://api.cloudinary.com/v1_1/cloud_name_here/upload',
{
method: 'POST',
body: fd
}
);

How can I retrieve a file from the file system using React Native, for conversion to base64 and http posting as JSON?

I am using the react native template from this article. The code is all available on Github here.
You can use the app to record audio and save to the file system. I figured out how to retrieve the file URIs, but I'm finding it impossible to get the actual contents of the file itself. All I want to do is retrieve the actual file contents as a binary or ascii or hex string or whatever (it's a .m4a file), so I can convert it to base64 encoding and then post it as JSON to my server. Here's what my code looks like:
/src/screens/RecordAudioScreen/RecordAudioScreenContainer.js
onEndRecording: props => async () => {
try {
// here is the URI
console.log("HERE IS THE URI!!");
const audio_data = "URI: " + props.recording._uri;
// Help needed here
// retrieve file contents from the Android/iOS file system
// Encode as base64
audio_data = ... // ???????
// this works already, posts to the server
fetch("https://myserver.com/accept_file",
{
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
method: "POST",
body: JSON.stringify({user_id: 1, audio_data: audio_data})
})
.then(function(res){ console.log(res) })
.catch(function(res){ console.log(res) });
console.log("FINISHED POST REQUEST!!!")
await props.recording.stopAndUnloadAsync();
await props.setAudioMode({ allowsRecordingIOS: false });
} catch (error) {
console.log(error); // eslint-disable-line
}
if (props.recording) {
const fileUrl = props.recording.getURI();
props.recording.setOnRecordingStatusUpdate(null);
props.setState({ recording: null, fileUrl });
}
},
I've already tried a bunch of stuff with no success. Ideally I just get the file contents from the File system, convert to base64 and post it off all in this method just in javascript, but this is seemingly very difficult for what should be a pretty standard thing to do in an app based framework.
Here's some stack overflow questions on React Native Fetch Blob which I couldn't make work Fetch Blob 1 Fetch Blob 2
I've tried using React Native Fs, but I can't get it to load properly, I got super bogged down in stuff I didn't understand after trying to eject the app. I'd prefer a plain React Native solution if possible.
I've also tried some code using FormData but couldn't get that to work either.
Maybe the answer is kind of like this question about retrieving images from firebase? I don't know, this is my first attempt at doing anything in React.
It might also have something to do with the "file://" prefix in the URI that gets generated because there's a lot of questions discussing removing that (only for Android, or only for iOS I'm not too clear).
Converting to base64 will be done with something like this, but I need the actual file contents first:
Very appreciative of any help.

Some time ago I wrote a simple example of a record voice app.
To get the files I used this method:
import RNFS from 'react-native-fs';
(...)
getFiles() {
RNFS.readDir(AudioUtils.DocumentDirectoryPath)
.then((result) => {
this.setState({recordedFiles: result});
return Promise.all([RNFS.stat(result[0].path), result[0].path]);
})
.catch((err) => {
console.log(err.message, err.code);
});
}
It worked just fine.
Here's the full example https://github.com/soutot/react-native-voice-record-app
Let me know if it helped. Otherwise we can try a different approach

React-Native: Downloading and uploading files from android webview

I am using the React-Native webview bridge module because I need its functions and now I am trying to make work the downloading and uploading files. For downloading I was sending a message with the url of the file and then using the Linking package to download in browser, unfortunately I was getting that the download is unsuccessful. Is there a way how I can manage both to work on this module?

I recently had to face the same problem for Android (although only for file uploads). You can see my implementation here: https://github.com/martinarroyo/react-native-webview-file-upload/
Maybe if you extend that code to include something like this you can include file downloading.

fetch(
_apiRoot+url+'?_format=json&access_token='+this.getAccessToken(),
{
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body:JSON.stringify(data)
}).then((response) => response.json())
.then((response) => {
success(response.data);
})
.catch((errorData) => {
error(errorData);
});
//Where data is an object like
let data = {
images:[responseDataFromImagePicker.data,responseDataFromImagePicker.data]
}
//the picker returns the image encoded in base64

Use fetch to post a blob in react-native

I'm trying to post a blob. It's definitely a blob. This isn't working in react-native though. I'm getting a red screen that says "PUT must have a request body". Well, I've put the blob in the request body.
createAttachment: function(url, blob) {
var settings = {
method: "PUT",
headers: {
'Accept': 'image/jpeg',
'Content-Type': 'image/jpeg',
'If-Match': '*',
},
body: blob
};
return fetch(url, settings)
}

My project had same problem before, according to this issue perhaps, blob data is not supported in react native fetch API currently (Both in send and receive).
So I made a module myself ..
https://github.com/wkh237/react-native-fetch-blob
It works fine in our project, if you don't mind to take a look, it might helps.

Use rn-fetch-blob lib for this:
https://github.com/joltup/rn-fetch-blob#user-content-upload-example--dropbox-files-upload-api

read file from ftp server

What is the best way to read the content of a FTP file from within a HTML5-App?
I have tried:
$.ajax
({
async: false,
url: 'ftp://ftp.XXX.de/Sonstiges/XXX.json',
dataType: 'json',
timeout:30000
})
.done(function (data)
{
//...
})
.fail(function (jqXHR, textStatus)
{
//...
}
but I always get into fail, probably because of a cross-domain security error.

Hmmm... There is one thing you need to take into account: ajax request could only send HTTP request, please refer to Does jQuery support ftp request?