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JS Stellar Bridge
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const EventEmitter = require('events'); | |
const { Server, Keypair, Network } = require('stellar-sdk'); | |
const { getAccount } = require('stellar-toolkit').StellarServer; | |
const { sendPayment } = require('stellar-toolkit').StellarOperations; | |
const { paymentListener } = require('stellar-toolkit').StellarStreamers; | |
const { areSameAssets, AssetInstance } = require('stellar-toolkit').StellarTools; | |
/** | |
* Generic Stellar anchor | |
* Extends EventEmitter | |
* | |
* @param {Object} config | |
* @param {Object} config.server | |
* @param {String} config.server.url | |
* @param {String} config.server.type | |
* @param {String} config.server.options | |
* @param {String} config.seed | |
* @param {String} config.asset_code | |
* @param {String} config.base_account | |
* @param {Function} config.log | |
*/ | |
class StellarAnchor extends EventEmitter { | |
constructor({ | |
server, | |
seed, | |
asset_code, | |
base_account, | |
log, | |
}) { | |
super(); | |
this.fetchPayment = this.fetchPayment.bind(this); | |
this.issueAsset = this.issueAsset.bind(this); | |
this._sendPayment = sendPayment; | |
this._paymentListener = paymentListener; | |
this._getAccount = getAccount; | |
this._log = log || console.log; | |
this.base_account = base_account; | |
this.keypair = Keypair.fromSecret(seed); | |
const asset = { | |
asset_code, | |
asset_issuer: this.keypair.publicKey(), | |
}; | |
this.issuingAsset = AssetInstance(asset); | |
this.stellarServer = new Server(server.url, server.options); | |
if (server.type === 'public') { | |
Network.usePublicNetwork(); | |
} else { | |
Network.useTestNetwork(); | |
} | |
} | |
initialize() { | |
return this.openAccount() | |
.then(() => { | |
this.listenAccount(); | |
this.on('issue', this.issueAsset); | |
}); | |
} | |
openAccount() { | |
const accountId = this.keypair.publicKey(); | |
return this._getAccount(accountId) | |
.then(account => { | |
this._log(`Successfuly loaded account ${accountId}`); | |
return account; | |
}) | |
.catch(e => { | |
throw e.name; | |
}) | |
} | |
fetchPayment(payment) { | |
const accountId = this.keypair.publicKey(); | |
if(payment.to !== accountId) return; | |
if(!areSameAssets(payment, this.issuingAsset)) return; | |
const amount = payment.amount; | |
let memo = { | |
type: payment.memo_type || 'none', | |
value: payment.memo, | |
}; | |
this._log(`Funded ${amount} ${this.issuingAsset.getCode()} from ${payment.from}`); | |
this.emit('fund', { | |
amount, | |
memo, | |
from: payment.from, | |
}); | |
} | |
listenAccount() { | |
// TODO listen from now only | |
this._paymentListener({ | |
accountId: this.keypair.publicKey(), | |
onPayment: this.fetchPayment, | |
server: this.stellarServer, | |
}); | |
} | |
issueAsset({ destination, amount, memo, callback = () => 0 }) { | |
this._getAccount(this.keypair.publicKey()) | |
.then(sourceAccount => | |
this._sendPayment( | |
{ | |
amount, | |
asset: this.issuingAsset, | |
destination: destination || this.base_account, | |
memo, | |
})( | |
{ | |
sourceAccount, | |
keypair: this.keypair, | |
} | |
)) | |
.then(() => { | |
const message = `Issued ${amount} ${this.issuingAsset.getCode()} to ${destination || this.base_account}` | |
this._log(message); | |
callback(null, message); | |
}) | |
.catch(callback); | |
} | |
} | |
module.exports = StellarAnchor; |
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