Geolocation npm package

The Geolocation npm package abstracts a lot of the complexity of manually requesting Proofs by providing a series of useful methods to easily check the validity of your values, sign messages and send requests to the W3bstream Node.

https://www.npmjs.com/package/@w3bstream/geolocation-lightwww.npmjs.com

Installation

To install the package run:

npm i @w3bstream/geolocation-light

HIW

Create a new instance of a geolocation, like this:

const geolocation = new GeolocationVerifier()

This constructor doesn't take any parameters for testnet.

In order to call the mainnet API you'll need to specify it like this:

new GeolocationVerifier({isMainnet: true})

In order to generate a Siwe message, you'll have to first create a location, like this:

geolocation.location = { 
    latitude: 47.658872,    // range [-90, 90]
    longitude: -27.4444,    // range [-180, 180]
    distance: 1000,         // range [0, infinity), meters
    from: 1676305034021,    // timestamp, unix milliseconds
    to: 1676305034488       // timestamp, unix milliseconds
}

Or for scaled coordinates (e.g. latitude: 47658872, etc...), you can set a scaledLocationArea like this:

// sets location area
geolocation.scaledLocation = {
    scaled_latitude: -45500000,
    scaled_longitude: 123000000,
    distance: 100,
    from: 1676305034,   // timestamp, unix seconds
    to: 1676305035      // timestamp, unix seconds
}

These values will be validated under the hood, and will be used in the generateSiweMessage() method:

// generates Siwe message and returns it as a string
const msg = geolocation.generateSiweMessage({
    domain: string,
    uri: string,
    address: string,
})

You can now use any library of choice to sign this message and retrieve its signature.

You can set the signature you just retrieved like this:

// sets the signature
geolocation.signature = "the-signature-you-just–got"

You're now ready to call the verifyLocation() method which will not need any params.

const verifiedLocation = await geolocation.verifyLocation();