Option to pass body to fetchBlob

Is your feature request related to a problem? Please describe.

I am trying to download a big file using our API

const options: BlobFetchInput = {
  method: 'POST',
  filename: 'offline.db',
  headers: {
    Authorization: `Bearer ${token}`,
    'Content-Type': 'application/json'
  },
  android: {
    target: 'data'
  },
  mimeType: 'application/octet-stream',
  url: `${apiUrl}api/v1/client-db/clone`
};

const response = await BlobCourier.fetchBlob(options);

JSON body with request parameters must be part of the request but unfortunatelly I didn’t find such option for fetchBlob.

Describe the solution you’d like

I want my request to look like this:

const options: BlobFetchInput = {
  method: 'POST',
  filename: 'offline.db',
  headers: {
    Authorization: `Bearer ${token}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ facilityIds })
  android: {
    target: 'data'
  },
  mimeType: 'application/octet-stream',
  url: `${apiUrl}api/v1/client-db/clone`
};

Describe alternatives you’ve considered

At the moment I use FileSystem.fetch from react-native-file-access but unfortunately it doesn’t provide a way to cancel a long request:

const options = {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${token}`,
    'Content-Type': 'application/json'
  },
  path: getDatabasePath(dbName),
  body: JSON.stringify({ facilityIds })
};
const url = `${apiUrl}api/v1/client-db/clone`;
const response = await FileSystem.fetch(url, options, onProgress);

[edeckers]

I totally get where you’re coming from, hopefully react-native-file-access solves the issue for you. Either way I’m still considering adding this feature in January / early 2022, so make sure to check back every now and then!

[edeckers]

It’s not too complicated in terms of code complexity, but I think it will amount to quite some lines and changes; more than you’d expect anyway. Something along the lines of https://github.com/edeckers/react-native-blob-courier/pull/141/files, and that PR doesn’t even include tests yet; typically each PR adds multiple tests for TypeScript, Android and iOS.

So I’d like to add the feature and help you out, but as you can imagine December isn’t the best month to find time for that, what with the Holidays and all that stuff going on. January seems feasible for me.

In addition I’d like to mention that I welcome PR’s, if you feel like making a start yourself! Should you consider doing so, let’s figure out a contract for the interface together before you start working on it, so your hard work won’t be for naught.