Web Bluetooth + Permissions API

web-bluetooth-permissions-proposal.js

function connectDevice(device) {
  return device.connectGATT()
  .then(...)
}
   
// Simple
        
permissions.query({ name: 'bluetooth' })
.then(permission => {
  if (permission.state != 'granted') {
    console.log('User has forbidden websites to use bluetooth...');
    return;
  }
  if (permission.referringDevice) {
    // Let's try to connect to the Physical Web object first. 
    return connectDevice(permission.referringDevice);
  }
  if (permission.devices.length != 0) {
    // Some Bluetooth devices are already allowed to interact with this website.
    // Let's try to connect to all of them.
    return Promise.all(permission.devices.map(device => connectDevice));
  }
  // Prompt user to pick a nearby hearth rate sensor. 
  return permissions.request({ name: 'bluetooth', filters: [{ services: ['heart_rate'] }] })
  .then(result => {
    if (result.state != 'granted') {
      return;
    }
    // Let's try to connect to the heart rate sensor.
    return connectDevice(result.devices[0]);
  });
});

// Restore

permissions.query({ name: 'bluetooth', deviceId: '123' })
.then(permission => {
  if (permission.state != 'granted') {
    console.log('User has forbidden websites to use bluetooth...');
    return;
  }
  if (permission.devices.length != 0) {
    // My previously connected Bluetooth device is still there.
    // Let's try to connect to it.
    return connectDevice(permission.devices[0]);
  }
  console.log('Previous Bluetooth device access has been revoked.');
  // Proceed to regular workflow as above...
});
  

Do you think the BT version would be helpful in the filter? What if the user only wants to connect to BT 4.0 devices?

The filters attribute is actually the same as http://webbluetoothcg.github.io/web-bluetooth/#dictdef-bluetoothscanfilter

LGTM from a WebUSB perspective as well.

Any news on this one? - it would be nice to be able to reconnect :)