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price.js
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price.js
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const { abi } = require('ara-contracts/build/contracts/AFS.json')
const debug = require('debug')('ara-filesystem:price')
const { AID_PREFIX } = require('./constants')
const { token } = require('ara-contracts')
const {
proxyExists,
getProxyAddress
} = require('ara-contracts/registry')
const {
getDocumentOwner,
validate,
web3: {
tx,
call,
account
}
} = require('ara-util')
/**
* Sets the price of the given Ara identity
* @param {Object} opts
* @param {String} opts.did
* @param {String} opts.password
* @param {String} opts.afsPassword
* @param {Number} opts.price
* @param {Boolean} opts.estimate
* @param {String} opts.estimateDid
* @param {Object} [opts.keyringOpts]
* @param {Number} [opts.gasPrice]
* @param {Function} [opts.onhash]
* @param {Function} [opts.onreceipt]
* @param {Function} [opts.onconfirmation]
* @param {Function} [opts.onerror]
* @param {Function} [opts.onmined]
*/
async function setPrice(opts) {
if (!opts || 'object' !== typeof opts) {
throw new TypeError('Expecting opts object.')
} else if ('string' !== typeof opts.did || !opts.did) {
throw new TypeError('Expecting non-empty string.')
} else if ('string' !== typeof opts.password || !opts.password) {
throw TypeError('Expecting non-empty password.')
} else if (opts.afsPassword && 'string' !== typeof opts.afsPassword) {
throw TypeError('Expecting non-empty password.')
} else if ('number' !== typeof opts.price || opts.price < 0) {
throw new TypeError('Expecting whole number price.')
} else if (opts.estimate && 'boolean' !== typeof opts.estimate) {
throw new TypeError('Expecting boolean.')
} else if (opts.estimateDid && 'string' !== typeof opts.estimateDid) {
throw new TypeError('Expecting non-empty string.')
} else if (opts.gasPrice && ('number' !== typeof opts.gasPrice || opts.gasPrice < 0)) {
throw new TypeError(`Expected 'opts.gasPrice' to be a positive number. Got ${opts.gasPrice}.`)
}
let {
did, estimate, price, afsPassword
} = opts
const {
password,
keyringOpts,
estimateDid,
gasPrice = 0,
onhash,
onreceipt,
onconfirmation,
onerror,
onmined
} = opts
afsPassword = afsPassword || password
estimate = estimate || false
let ddo
try {
({ did, ddo } = await validate({
did, password: afsPassword, label: 'price', keyringOpts
}))
} catch (err) {
throw err
}
if (estimateDid) {
did = estimate ? estimateDid : did
}
const currentPrice = await getPrice({ did })
if (currentPrice == price && !estimate) {
throw new Error(`AFS price is already ${price}`)
}
if (!(await proxyExists(did))) {
throw new Error('Proxy doesn\'t exist, please deploy a proxy for this AFS first.')
}
const proxy = await getProxyAddress(did)
let owner = getDocumentOwner(ddo, true)
owner = `${AID_PREFIX}${owner}`
const acct = await account.load({ did: owner, password })
if ('string' !== typeof price) {
price = price.toString()
}
price = token.expandTokenValue(price)
try {
const { tx: transaction, ctx } = await tx.create({
account: acct,
to: proxy,
gasPrice,
data: {
abi,
functionName: 'setPrice',
values: [
price
]
}
})
if (estimate) {
const cost = tx.estimateCost(transaction)
ctx.close()
return cost
}
const receipt = await tx.sendSignedTransaction(transaction, {
onhash,
onreceipt,
onconfirmation,
onerror,
onmined
})
ctx.close()
return receipt
} catch (err) {
throw new Error(`This AFS has not been committed to the network,
please commit before trying to set a price.`)
}
}
/**
* Gets the price of the given Ara identity
* @param {Object} opts
* @param {String} opts.did
* @return {Number}
*/
async function getPrice(opts) {
if (!opts || 'object' !== typeof opts) {
throw new TypeError('Expecting opts object.')
} else if ('string' !== typeof opts.did || !opts.did) {
throw new TypeError('Expecting non-empty string.')
}
const { did } = opts
if (!(await proxyExists(did))) {
throw new Error('This content does not have a valid proxy contract')
}
const proxy = await getProxyAddress(did)
const result = await call({
abi,
address: proxy,
functionName: 'price_'
})
debug('price for %s: %d', did, result)
return token.constrainTokenValue(result)
}
module.exports = {
setPrice,
getPrice
}