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stores.js
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stores.js
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import { proxied } from 'svelte-proxied-store'
import { derived } from 'svelte/store'
import chains from './chains.js'
/* eslint no-undef: "warn" */
const getGlobalObject = () => {
if (typeof globalThis !== 'undefined') {
return globalThis
}
if (typeof self !== 'undefined') {
return self
}
if (typeof window !== 'undefined') {
return window
}
if (typeof global !== 'undefined') {
return global
}
throw new Error('[svelte-web3] cannot find the global object')
}
export let Web3 = {}
export const loadWeb3 = () => {
if (Web3.version) return
try {
Web3 = getGlobalObject().Web3 || {}
} catch (err) {
console.error('[svelte-web3] no globalThis.Web3 object')
}
}
const getWindowEthereum = () => {
try {
if (getGlobalObject().ethereum) return getGlobalObject().ethereum
} catch (err) {
console.error('[svelte-web3] no globalThis.ethereum object')
}
}
// always get chainId as number EDIT: Always as hex
const alwaysHex = (n) => (Web3.utils.isHex(n) ? n : Web3.utils.toHex(n))
export const createStore = () => {
const { emit, get, subscribe, assign, deleteAll } = proxied()
const switch1193Provider = async ({
chainId,
accounts,
addressOrIndex = 0
}) => {
// console.log('switch1193Provider', { accounts, chainId }, get('web3'), get('eipProvider'))
if (!chainId) {
chainId = alwaysHex(await get('web3').eth.getChainId())
}
if (!accounts) {
accounts = await get('web3').eth.getAccounts()
}
if (addressOrIndex >= accounts.length) {
console.warn("[svelte-web3] addressOrIndex doesn't exist")
addressOrIndex = 0
}
assign({
connected: true,
selectedAccount:
Array.isArray(accounts) && accounts.length
? accounts[addressOrIndex]
: null,
chainId,
accounts
})
emit()
}
const accountsChangedHandler = (accounts) => switch1193Provider({ accounts })
const chainChangedHandler = (chainId) =>
switch1193Provider({ chainId: alwaysHex(chainId) })
// TODO better error support ?
const disconnectHandler = (error) => switch1193Provider({ error })
const init = () => {
loadWeb3()
if (!Web3.version) throw new Error('[svelte-web3] Cannot find Web3')
if (get('eipProvider') && get('eipProvider').removeListener) {
get('eipProvider').removeListener(
'accountsChanged',
accountsChangedHandler
)
get('eipProvider').removeListener('chainChanged', chainChangedHandler)
get('eipProvider').removeListener('disconnect', disconnectHandler)
}
deleteAll()
assign({
connected: false,
evmProviderType: '',
accounts: []
})
}
const set1193Provider = async (eipProvider, addressOrIndex) => {
init()
let accounts
try {
accounts = await eipProvider.request({ method: 'eth_requestAccounts' })
} catch (e) {
console.warn('[svelte-web3] non compliant 1193 provider')
// some provider may store accounts directly like walletconnect
accounts = eipProvider.accounts
}
const web3 = new Web3(eipProvider)
assign({
web3,
eipProvider,
evmProviderType: 'EIP1193',
accounts
})
if (eipProvider.on) {
// TODO handle disconnect/connect events
eipProvider.on('accountsChanged', accountsChangedHandler)
eipProvider.on('chainChanged', chainChangedHandler)
eipProvider.on('disconnect', disconnectHandler)
}
return switch1193Provider({ accounts, addressOrIndex })
}
const setProvider = async (provider, addressOrIndex = 0) => {
if (!provider) {
if (!getWindowEthereum())
throw new Error(
'[svelte-web3] Please authorize browser extension (Metamask or similar)'
)
getWindowEthereum().autoRefreshOnNetworkChange = false
return set1193Provider(getWindowEthereum())
}
if (typeof provider === 'object' && provider.request)
return set1193Provider(provider, addressOrIndex)
init()
const web3 = new Web3(provider)
const chainId = alwaysHex(await web3.eth.getChainId())
let accounts = []
try {
// not all provider support accounts
accounts = await web3.eth.getAccounts()
} catch (e) {
console.warn(e)
}
if (addressOrIndex >= accounts.length) {
console.warn("[svelte-web3] addressOrIndex doesn't exist")
addressOrIndex = 0
}
assign({
web3,
selectedAccount: accounts.length ? accounts[addressOrIndex] : null,
connected: true,
chainId,
evmProviderType: 'Web3',
accounts
})
emit()
}
const setBrowserProvider = () => {
console.warn(
'[svelte-web3] setBrowserProvider is deprecated. Please use setProvider() without argument instead.'
)
return setProvider()
}
const disconnect = async () => {
init()
emit()
}
return {
setBrowserProvider,
setProvider,
disconnect,
subscribe,
get
}
}
export const createContractStore = () => {
const { emit, get, subscribe, assign, deleteAll } = proxied()
const attachContract = async (name, address, abi, options) => {
assign({
[name]: [address, abi, options]
})
emit()
}
return {
attachContract,
subscribe,
get
}
}
const allStores = {}
const noData = { rpc: [], explorers: [{}], faucets: [], nativeCurrency: {} }
const getData = (id) => {
if (!id || !Web3.utils) return noData
if (Web3.utils.isHexStrict(id)) id = Web3.utils.hexToNumber(id)
for (const data of chains) {
if (data.chainId === id) return data
}
return noData
}
const subStoreNames = ['web3', 'selectedAccount', 'connected', 'chainId']
export const makeEvmStores = (name) => {
const evmStore = (allStores[name] = createStore())
const registry = createContractStore()
const target = {}
allStores[name].web3 = derived(evmStore, ($evmStore) => {
if (!$evmStore.web3) return { utils: Web3.utils, version: Web3.version }
return $evmStore.web3
})
allStores[name].selectedAccount = derived(
evmStore,
($evmStore) => $evmStore.selectedAccount
)
allStores[name].connected = derived(
evmStore,
($evmStore) => $evmStore.connected
)
allStores[name].chainId = derived(evmStore, ($evmStore) => $evmStore.chainId)
allStores[name].chainData = derived(evmStore, ($evmStore) =>
$evmStore.chainId ? getData($evmStore.chainId) : {}
)
allStores[name].evmProviderType = derived(
evmStore,
($evmStore) => $evmStore.evmProviderType
)
allStores[name].walletType = derived(evmStore, ($evmStore) => {
if (!$evmStore.eipProvider) return null
if (typeof $evmStore.eipProvider === 'string') return $evmStore.eipProvider
if ($evmStore.eipProvider.isNiftyWallet) return 'Nifty'
if ($evmStore.eipProvider.isTrust) return 'Trust'
if ($evmStore.eipProvider.isMetaMask) return 'MetaMask (or compatible)'
if (
$evmStore.eipProvider.bridge &&
/walletconnect/.test($evmStore.eipProvider.bridge)
)
return 'WalletConnect'
return 'Unknown'
})
allStores[name].contracts = derived(
[evmStore, registry],
([$evmStore, $registry]) => {
if (!$evmStore.connected) return target
for (let key of Object.keys($registry)) {
target[key] = new $evmStore.web3.eth.Contract(
$registry[key][1],
$registry[key][0],
$registry[key][2]
)
}
return target
}
)
// force one subscribtion on $contracts so it's defined via proxy
allStores[name].contracts.subscribe(() => {})
return new Proxy(allStores[name], {
get: function (internal, property) {
if (property === '$contracts') return target
if (/^\$/.test(property)) {
// TODO forbid deconstruction !
property = property.slice(1)
if (subStoreNames.includes(property))
return allStores[name].get(property)
throw new Error(`[svelte-web3] no value for store named ${property}`)
}
if (property === 'attachContract') return registry.attachContract
if (
[
'subscribe',
'get',
'setBrowserProvider',
'setProvider',
'evmProviderType',
'chainData',
'walletType',
'close',
'disconnect',
...subStoreNames
].includes(property)
)
return Reflect.get(internal, property)
throw new Error(`[svelte-web3] no store named ${property}`)
}
})
}
export const getChainStore = (name) => {
if (!allStores[name])
throw new Error(`[svelte-web3] chain store ${name} does not exist`)
return allStores[name]
}
loadWeb3()
export { chains as allChainsData }
export const getChainDataByChainId = (id) =>
(chains.filter((o) => o.chainId === id) || [{}])[0]
export const defaultEvmStores = makeEvmStores('default')
export const connected = allStores.default.connected
export const chainId = allStores.default.chainId
export const chainData = allStores.default.chainData
export const selectedAccount = allStores.default.selectedAccount
export const web3 = allStores.default.web3
export const evmProviderType = allStores.default.evmProviderType
export const contracts = allStores.default.contracts
// TODO spin off dectector
export const walletType = allStores.default.walletType