google-earth-engine – How to Fix ee.data.authenticateViaPrivateKey Issue in Google Earth Engine Node.js

authenticationgoogle-earth-enginegoogle-earth-engine-javascript-api

I'm using visual studio code to develop a web application that monitors air quality using google earth engine. The issue I'm having is that the authentication is not working. I already tried the instructions in the google earth engine NPM installation guide but that doesn't work either.

here my code:

var ee = require('@google/earthengine');
var privateKey = require('./privatekey.json');
var client_email = "email"
ee.data.authenticateViaPrivateKey(
{client_email, privateKey},
() => console.log('Authentication succeeded'),
error => console.error('Authentication failed:')

)

I know the issue is not the value of the client_email variable. I just changed it here just in case.
The error shows

error in text:

Uncaught Error: Use of private key authentication in the browser is 
insecure. Consider using OAuth, instead.
at Object.ee.data.authenticateViaPrivateKey (bundle.js:18136)
at Object.2../privatekey.json (bundle.js:23980)
at o (bundle.js:1)
at r (bundle.js:1)
at bundle.js:1

I don't know if this is relevant information but I'm also using Browserify so that my main.js script would work since it previously displayed a "require not defined error".

Best Answer

It appears that code is being run in the user's browser. That means that anyone with access to the website will also have the private keys to the service account you're using to authenticate. Malicious actors could easily take those keys and use your resource quota without your permission, or worse.

As the error message suggests, you should consider using OAuth instead so that users can log in using their own Earth Engine accounts. You can find high level instructions here:

https://developers.google.com/earth-engine/guides/app_engine_intro#oauth-2.0-client-id

And a basic example of what this might look like in practice here:

https://github.com/google/earthengine-api/tree/master/demos/client-auth/static

Hope this helps!

Related Solutions

Google Earth Engine Map.addLayer – Fixing Issue with Adding Bands

(Note: I know nothing about appropriate visualization of "EVI" data; my suggestions in this answer are general advice on Earth Engine programming and not specifically recommended as good visualizations.)

I know that these bands do exist…

You checked img161, where those band names do exist, but you're trying to visualize evi, which does not have those bands — it has one band, which you just computed using an expression:

var evi = img161.expression(
    '2.5 * ((NIR - RED) / (NIR + 6 * RED - 7.5 * BLUE + 1))', {
      'NIR': img161.select('B8'),
      'RED': img161.select('B4'),
      'BLUE': img161.select('B2')
});

When you compute an image by doing arithmetic on single band images (as you have provided here using .select()), the output is also single-band (and the band name is often irrelevant — here it is 'constant' because the very first input is the constant-image-value 2.5).

You have one band, but your evivisparam specifies three bands. The question, then, is: what kind of visualization do you want?

If grayscale will do, remove bands from the visualization parameters.
```
var evivisparam = {min: -1, max: 1};
```

If you want a color gradient, specify a palette in the visualization parameters.

var evivisparam = {min: -1, max: 1, palette: ['FF0000', '000000', '00FF44']};

If you want one color channel to be the EVI value and others to be the original bands, then you need to recombine the computed EVI band with the original image bands, and specify suitable visualization parameters for red, green, and blue:
```
var evivisparam = {
  min: [-11000, -1, -11000],
  max: [11000, 1, 11000],
  bands: ['B4', 'evi', 'B2']

};
var img161WithEvi = img161.addBands(evi.rename('evi'));
Map.addLayer(img161WithEvi, evivisparam, 'EVI img161');
```

Best Answer

Related Solutions

Google Earth Engine Map.addLayer – Fixing Issue with Adding Bands

Related Question