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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| import type {EIP6963AnnounceProviderEvent, MetaMaskInpageProvider} from '@metamask/providers' | ||
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| export type Snap = { | ||
| permissionName: string | ||
| id: string | ||
| version: string | ||
| initialPermissions: Record<string, unknown> | ||
| } | ||
|
|
||
| export type InvokeSnapParams = { | ||
| method: string | ||
| params?: Record<string, unknown> | ||
| } | ||
|
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| /** | ||
| * Check if the current provider supports snaps by calling `wallet_getSnaps`. | ||
| * | ||
| * @param provider - The provider to use to check for snaps support. Defaults to | ||
| * `window.ethereum`. | ||
| * @returns True if the provider supports snaps, false otherwise. | ||
| */ | ||
| export async function hasSnapsSupport(provider: MetaMaskInpageProvider = window.ethereum) { | ||
| try { | ||
| await provider.request({ | ||
| method: 'wallet_getSnaps', | ||
| }) | ||
|
|
||
| return true | ||
| } catch { | ||
| return false | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Get a MetaMask provider using EIP6963. This will return the first provider | ||
| * reporting as MetaMask. If no provider is found after 500ms, this will | ||
| * return null instead. | ||
| * | ||
| * @returns A MetaMask provider if found, otherwise null. | ||
| */ | ||
| export async function getMetaMaskEIP6963Provider() { | ||
| return new Promise<MetaMaskInpageProvider | null>((rawResolve) => { | ||
| // Timeout looking for providers after 500ms | ||
| const timeout = setTimeout(() => { | ||
| resolve(null) | ||
| }, 500) | ||
|
|
||
| /** | ||
| * Resolve the promise with a MetaMask provider and clean up. | ||
| * | ||
| * @param provider - A MetaMask provider if found, otherwise null. | ||
| */ | ||
| function resolve(provider: MetaMaskInpageProvider | null) { | ||
| window.removeEventListener('eip6963:announceProvider', onAnnounceProvider) | ||
| clearTimeout(timeout) | ||
| rawResolve(provider) | ||
| } | ||
|
|
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| /** | ||
| * Listener for the EIP6963 announceProvider event. | ||
| * | ||
| * Resolves the promise if a MetaMask provider is found. | ||
| * | ||
| * @param event - The EIP6963 announceProvider event. | ||
| * @param event.detail - The details of the EIP6963 announceProvider event. | ||
| */ | ||
| function onAnnounceProvider({detail}: EIP6963AnnounceProviderEvent) { | ||
| const {info, provider} = detail | ||
|
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| if (info.rdns.includes('io.metamask')) { | ||
| resolve(provider) | ||
| } | ||
| } | ||
|
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| window.addEventListener('eip6963:announceProvider', onAnnounceProvider) | ||
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| window.dispatchEvent(new Event('eip6963:requestProvider')) | ||
| }) | ||
| } | ||
|
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| /** | ||
| * Get a provider that supports snaps. This will loop through all the detected | ||
| * providers and return the first one that supports snaps. | ||
| * | ||
| * @returns The provider, or `null` if no provider supports snaps. | ||
| */ | ||
| export async function getSnapsProvider() { | ||
| if (typeof window === 'undefined') { | ||
| return null | ||
| } | ||
|
|
||
| if (await hasSnapsSupport()) { | ||
| return window.ethereum | ||
| } | ||
|
|
||
| if (window.ethereum?.detected) { | ||
| for (const provider of window.ethereum.detected) { | ||
| if (await hasSnapsSupport(provider)) { | ||
| return provider | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (window.ethereum?.providers) { | ||
| for (const provider of window.ethereum.providers) { | ||
| if (await hasSnapsSupport(provider)) { | ||
| return provider | ||
| } | ||
| } | ||
| } | ||
|
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| const eip6963Provider = await getMetaMaskEIP6963Provider() | ||
|
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| if (eip6963Provider && (await hasSnapsSupport(eip6963Provider))) { | ||
| return eip6963Provider | ||
| } | ||
|
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||
| return null | ||
| } | ||
|
|
||
| /** | ||
| * Check if the current provider is a Flask provider by checking the client version. | ||
| * | ||
| * @param provider - The provider to use to check for Flask. Defaults to | ||
| * `window.ethereum`. | ||
| * @returns True if the provider is a Flask provider, false otherwise. | ||
| */ | ||
| export async function checkIsFlask(provider: MetaMaskInpageProvider | null) { | ||
| if (!provider) return false | ||
| const clientVersion = await provider.request({method: 'web3_clientVersion'}) | ||
| return (clientVersion as string[])?.includes('flask') | ||
| } |
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