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feat: add metamask-snap support (#208)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| import type { | ||
| IStarknetWindowObject, | ||
| RpcMessage, | ||
| StarknetWindowObject, | ||
| WalletEvents, | ||
| } from "../StarknetWindowObject" | ||
| import wallets, { WalletProvider } from "../discovery" | ||
| import { init, loadRemote } from "@module-federation/runtime" | ||
|
|
||
| interface MetaMaskProvider { | ||
| isMetaMask: boolean | ||
| request(options: { method: string }): Promise<void> | ||
| } | ||
|
|
||
| function isMetaMaskProvider(obj: unknown): obj is MetaMaskProvider { | ||
| return ( | ||
| obj !== null && | ||
| typeof obj === "object" && | ||
| obj.hasOwnProperty("isMetaMask") && | ||
| obj.hasOwnProperty("request") | ||
| ) | ||
| } | ||
|
|
||
| function detectMetaMaskProvider( | ||
| windowObject: Record<string, unknown>, | ||
| { timeout = 3000 } = {}, | ||
| ) { | ||
| let handled = false | ||
| return new Promise<MetaMaskProvider | null>((resolve) => { | ||
| if (windowObject.ethereum) { | ||
| handleEthereum() | ||
| } else { | ||
| if (typeof windowObject.addEventListener === "function") { | ||
| windowObject.addEventListener("ethereum#initialized", handleEthereum, { | ||
| once: true, | ||
| }) | ||
| } | ||
| setTimeout(() => { | ||
| handleEthereum() | ||
| }, timeout) | ||
| } | ||
| function handleEthereum() { | ||
| if (handled) { | ||
| return | ||
| } | ||
| handled = true | ||
| if (typeof windowObject.removeEventListener === "function") { | ||
| windowObject.removeEventListener("ethereum#initialized", handleEthereum) | ||
| } | ||
| const { ethereum } = windowObject | ||
| if (isMetaMaskProvider(ethereum)) { | ||
| resolve(ethereum) | ||
| } else { | ||
| resolve(null) | ||
| } | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| async function waitForMetaMaskProvider( | ||
| windowObject: Record<string, unknown>, | ||
| options: { timeout?: number; retries?: number } = {}, | ||
| ): Promise<MetaMaskProvider | null> { | ||
| const { timeout = 3000, retries = 0 } = options | ||
|
|
||
| let provider: MetaMaskProvider | null = null | ||
| try { | ||
| provider = await detectMetaMaskProvider(windowObject, { timeout }) | ||
| } catch { | ||
| // Silent error - do nothing | ||
| } | ||
|
|
||
| if (provider) { | ||
| return provider | ||
| } | ||
|
|
||
| if (retries === 0) { | ||
| return null | ||
| } | ||
|
|
||
| provider = await waitForMetaMaskProvider({ timeout, retries: retries - 1 }) | ||
| return provider | ||
| } | ||
|
|
||
| async function detectMetamaskSupport(windowObject: Record<string, unknown>) { | ||
| const provider = await waitForMetaMaskProvider(windowObject, { retries: 3 }) | ||
| return provider | ||
| } | ||
|
|
||
| function createMetaMaskProviderWrapper( | ||
| walletInfo: WalletProvider, | ||
| provider: unknown, | ||
| ): StarknetWindowObject { | ||
| let metaMaskSnapWallet: IStarknetWindowObject | undefined | ||
| const metaMaskProviderWrapper: IStarknetWindowObject = { | ||
| id: walletInfo.id, | ||
| name: walletInfo.name, | ||
| icon: walletInfo.icon, | ||
| get version() { | ||
| return metaMaskSnapWallet?.version ?? "0.0.0" | ||
| }, | ||
| get isConnected() { | ||
| return metaMaskSnapWallet?.isConnected ?? false | ||
| }, | ||
| get provider() { | ||
| return metaMaskSnapWallet?.provider | ||
| }, | ||
| get account() { | ||
| return metaMaskSnapWallet?.account | ||
| }, | ||
| get selectedAddress() { | ||
| return metaMaskSnapWallet?.selectedAddress | ||
| }, | ||
| get chainId() { | ||
| return metaMaskSnapWallet?.chainId | ||
| }, | ||
| request<T extends RpcMessage>( | ||
| call: Omit<T, "result">, | ||
| ): Promise<T["result"]> { | ||
| if (!metaMaskSnapWallet) { | ||
| throw new Error("Wallet not enabled") | ||
| } | ||
| return metaMaskSnapWallet.request(call) | ||
| }, | ||
| async enable(): Promise<string[]> { | ||
| if (!metaMaskSnapWallet) { | ||
| await init({ | ||
| name: "MetaMaskStarknetSnapWallet", | ||
| remotes: [ | ||
| { | ||
| name: "MetaMaskStarknetSnapWallet", | ||
| alias: "MetaMaskStarknetSnapWallet", | ||
| entry: | ||
| "https://snaps.consensys.io/starknet/get-starknet/v1/remoteEntry.js", | ||
| }, | ||
| ], | ||
| }) | ||
|
|
||
| const result = await loadRemote("MetaMaskStarknetSnapWallet/index") | ||
|
|
||
| const { MetaMaskSnapWallet } = result as { | ||
| MetaMaskSnapWallet: any | ||
| MetaMaskSnap: any | ||
| } | ||
|
|
||
| metaMaskSnapWallet = new MetaMaskSnapWallet(provider, "*") | ||
| } | ||
|
|
||
| return await metaMaskSnapWallet!.enable() | ||
| }, | ||
| isPreauthorized() { | ||
| return metaMaskSnapWallet?.isPreauthorized() ?? Promise.resolve(false) | ||
| }, | ||
| on<E extends WalletEvents>( | ||
| event: E["type"], | ||
| handleEvent: E["handler"], | ||
| ): void { | ||
| if (!metaMaskSnapWallet) { | ||
| throw new Error("Wallet not enabled") | ||
| } | ||
| // @ts-ignore: Metamask currently doesn't support on method | ||
| return metaMaskSnapWallet.on(event, handleEvent) | ||
| }, | ||
| off<E extends WalletEvents>(event: E["type"], handleEvent: E["handler"]) { | ||
| if (!metaMaskSnapWallet) { | ||
| throw new Error("Wallet not enabled") | ||
| } | ||
| // @ts-ignore: Metamask currently doesn't support off method | ||
| return metaMaskSnapWallet.off(event, handleEvent) | ||
| }, | ||
| } | ||
|
|
||
| return metaMaskProviderWrapper as StarknetWindowObject | ||
| } | ||
|
|
||
| async function injectMetamaskBridge(windowObject: Record<string, unknown>) { | ||
| if (window.hasOwnProperty("starknet_metamask")) { | ||
| return | ||
| } | ||
|
|
||
| const metamaskWalletInfo = wallets.find((wallet) => wallet.id === "metamask") | ||
| if (!metamaskWalletInfo) { | ||
| return | ||
| } | ||
|
|
||
| const provider = await detectMetamaskSupport(windowObject) | ||
| if (!provider) { | ||
| return | ||
| } | ||
|
|
||
| window.starknet_metamask = createMetaMaskProviderWrapper( | ||
| metamaskWalletInfo, | ||
| provider, | ||
| ) | ||
| } | ||
|
|
||
| export { injectMetamaskBridge } |
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