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type { MultichainApiClient, SessionData } from '@metamask/multichain-api-client';\nimport {\n SOLANA_DEVNET_CHAIN,\n SOLANA_MAINNET_CHAIN,\n SOLANA_TESTNET_CHAIN,\n type SolanaChain,\n} from '@solana/wallet-standard-chains';\nimport {\n SolanaSignAndSendTransaction,\n type SolanaSignAndSendTransactionFeature,\n type SolanaSignAndSendTransactionInput,\n type SolanaSignAndSendTransactionOutput,\n SolanaSignIn,\n type SolanaSignInFeature,\n type SolanaSignInInput,\n type SolanaSignInOutput,\n SolanaSignMessage,\n type SolanaSignMessageFeature,\n type SolanaSignMessageInput,\n type SolanaSignMessageOutput,\n SolanaSignTransaction,\n type SolanaSignTransactionFeature,\n type SolanaSignTransactionInput,\n type SolanaSignTransactionOutput,\n} from '@solana/wallet-standard-features';\nimport type { IdentifierArray, Wallet } from '@wallet-standard/base';\nimport {\n StandardConnect,\n type StandardConnectFeature,\n type StandardConnectOutput,\n StandardDisconnect,\n type StandardDisconnectFeature,\n StandardEvents,\n type StandardEventsFeature,\n type StandardEventsListeners,\n type StandardEventsNames,\n type StandardEventsOnMethod,\n} from '@wallet-standard/features';\nimport { ReadonlyWalletAccount } from '@wallet-standard/wallet';\nimport bs58 from 'bs58';\nimport { metamaskIcon } from './icon';\nimport { type CaipAccountId, type DeepWriteable, Scope, type WalletOptions } from './types';\nimport { getAddressFromCaipAccountId, getScopeFromWalletStandardChain, isSessionChangedEvent } from './utils';\n\nexport class MetamaskWalletAccount extends ReadonlyWalletAccount {\n constructor({ address, publicKey, chains }: { address: string; publicKey: Uint8Array; chains: IdentifierArray }) {\n const features: IdentifierArray = [\n SolanaSignAndSendTransaction,\n SolanaSignTransaction,\n SolanaSignMessage,\n SolanaSignIn,\n ];\n super({ address, publicKey, chains, features });\n if (new.target === MetamaskWalletAccount) {\n Object.freeze(this);\n }\n }\n}\n\nexport class MetamaskWallet implements Wallet {\n // list of scopes in priority order for resolving selected account\n static readonly scopes = [Scope.MAINNET, Scope.DEVNET, Scope.TESTNET] as const;\n\n readonly #listeners: { [E in StandardEventsNames]?: StandardEventsListeners[E][] } = {};\n readonly version = '1.0.0' as const;\n readonly name;\n readonly icon = metamaskIcon;\n readonly chains: SolanaChain[] = [SOLANA_MAINNET_CHAIN, SOLANA_DEVNET_CHAIN, SOLANA_TESTNET_CHAIN];\n protected scope: Scope | undefined;\n #account: MetamaskWalletAccount | undefined;\n #removeSessionChangedListener: (() => void) | undefined;\n\n client: MultichainApiClient;\n\n get accounts() {\n return this.#account ? [this.#account] : [];\n }\n\n get features(): StandardConnectFeature &\n SolanaSignInFeature &\n StandardDisconnectFeature &\n StandardEventsFeature &\n SolanaSignAndSendTransactionFeature &\n SolanaSignTransactionFeature &\n SolanaSignMessageFeature {\n return {\n [StandardConnect]: {\n version: this.version,\n connect: this.#connect,\n },\n [SolanaSignIn]: {\n version: this.version,\n signIn: this.#signIn,\n },\n [StandardDisconnect]: {\n version: this.version,\n disconnect: this.#disconnect,\n },\n [StandardEvents]: {\n version: this.version,\n on: this.#on,\n },\n [SolanaSignAndSendTransaction]: {\n version: this.version,\n supportedTransactionVersions: ['legacy', 0],\n signAndSendTransaction: this.#signAndSendTransaction,\n },\n [SolanaSignTransaction]: {\n version: this.version,\n supportedTransactionVersions: ['legacy', 0],\n signTransaction: this.#signTransaction,\n },\n [SolanaSignMessage]: {\n version: this.version,\n signMessage: this.#signMessage,\n },\n };\n }\n\n constructor({ client, walletName }: WalletOptions) {\n this.client = client;\n this.name = `${walletName ?? 'MetaMask'}` as const;\n\n // TODO: talk with Baptiste and Edouard about this\n this.#tryRestoringSession();\n this.#removeSessionChangedListener = this.client.onNotification(this.#handleSessionChangedEvent.bind(this));\n }\n\n #on: StandardEventsOnMethod = (event, listener) => {\n if (this.#listeners[event]) {\n this.#listeners[event]?.push(listener);\n } else {\n this.#listeners[event] = [listener];\n }\n return () => this.#off(event, listener);\n };\n\n #emit(event: E, ...args: Parameters): void {\n for (const listener of this.#listeners[event] ?? []) {\n listener.apply(null, args);\n }\n }\n\n #off(event: E, listener: StandardEventsListeners[E]): void {\n this.#listeners[event] = this.#listeners[event]?.filter((existingListener) => listener !== existingListener);\n }\n\n #connect = async (): Promise => {\n if (this.accounts.length) {\n // Already connected\n return { accounts: this.accounts };\n }\n\n // Try restoring session\n await this.#tryRestoringSession();\n\n // Otherwise create a session on Mainnet by default\n if (!this.accounts.length) {\n await this.#createSession(Scope.MAINNET);\n }\n\n // In case user didn't select any Solana scope/account, return\n if (!this.accounts.length) {\n return { accounts: [] };\n }\n\n this.#removeSessionChangedListener?.();\n this.#removeSessionChangedListener = this.client.onNotification(this.#handleSessionChangedEvent.bind(this));\n\n return { accounts: this.accounts };\n };\n\n #signIn = async (...inputs: SolanaSignInInput[]): Promise => {\n if (!this.#account || !this.scope) {\n await this.#connect();\n\n if (!this.#account || !this.scope) {\n throw new Error('Not connected');\n }\n }\n\n const results: SolanaSignInOutput[] = [];\n\n for (const input of inputs) {\n const signInRes = await this.client.invokeMethod({\n scope: this.scope,\n request: {\n method: 'signIn',\n params: {\n ...input,\n domain: input.domain || window.location.host,\n address: input.address || this.#account.address,\n } as DeepWriteable,\n },\n });\n\n results.push({\n account: this.#account,\n signedMessage: Buffer.from(signInRes.signedMessage, 'base64'),\n signature: bs58.decode(signInRes.signature),\n });\n }\n\n return results;\n };\n\n #disconnect = async (options: { revokeSession?: boolean } = {}) => {\n const wasConnected = Boolean(this.#account);\n const { revokeSession = true } = options;\n this.#account = undefined;\n this.scope = undefined;\n if (wasConnected) {\n this.#emit('change', { accounts: this.accounts });\n }\n if (revokeSession) {\n this.#removeSessionChangedListener?.();\n this.#removeSessionChangedListener = undefined;\n await this.client.revokeSession({ scopes: [...MetamaskWallet.scopes] });\n }\n };\n\n #signAndSendTransaction = async (\n ...inputs: SolanaSignAndSendTransactionInput[]\n ): Promise => {\n const account = this.#account;\n if (!account) {\n throw new Error('Not connected');\n }\n\n this.#validateSendTransactionInput(inputs);\n\n const scope = getScopeFromWalletStandardChain(inputs[0]?.chain);\n const session = await this.client.getSession();\n const sessionAccounts = session?.sessionScopes[scope]?.accounts;\n\n // Update session if account isn't permissioned for this scope\n if (sessionAccounts?.includes(`${scope}:${account.address}`)) {\n this.scope = scope;\n } else {\n // Create the session with only the devnet scope, to protect users from accidentally signing transactions on mainnet\n await this.#createSession(scope, [account.address]);\n }\n\n const results: SolanaSignAndSendTransactionOutput[] = [];\n\n for (const { transaction: transactionBuffer, account } of inputs) {\n const transaction = Buffer.from(transactionBuffer).toString('base64');\n\n const signAndSendTransactionRes = await this.client.invokeMethod({\n scope,\n request: {\n method: 'signAndSendTransaction',\n params: {\n account: { address: account.address },\n transaction,\n scope,\n },\n },\n });\n\n results.push({\n signature: bs58.decode(signAndSendTransactionRes.signature),\n });\n }\n\n return results;\n };\n\n #signTransaction = async (...inputs: SolanaSignTransactionInput[]): Promise => {\n if (!this.scope) {\n throw new Error('Not connected');\n }\n\n const results: SolanaSignTransactionOutput[] = [];\n\n for (const { transaction: transactionBuffer, account } of inputs) {\n const transaction = Buffer.from(transactionBuffer).toString('base64');\n\n const signTransactionRes = await this.client.invokeMethod({\n scope: this.scope,\n request: {\n method: 'signTransaction',\n params: {\n account: { address: account.address },\n transaction,\n scope: this.scope,\n },\n },\n });\n\n results.push({\n signedTransaction: Uint8Array.from(Buffer.from(signTransactionRes.signedTransaction, 'base64')),\n });\n }\n\n return results;\n };\n\n #signMessage = async (...inputs: SolanaSignMessageInput[]): Promise => {\n if (!this.scope) {\n throw new Error('Not connected');\n }\n\n const results: SolanaSignMessageOutput[] = [];\n\n for (const { message: messageBuffer, account } of inputs) {\n const message = Buffer.from(messageBuffer).toString('base64');\n\n const signMessageRes = await this.client.invokeMethod({\n scope: this.scope,\n request: {\n method: 'signMessage',\n params: {\n message,\n account: { address: account.address },\n },\n },\n });\n\n results.push({\n signedMessage: Buffer.from(signMessageRes.signedMessage, 'base64'),\n signature: bs58.decode(signMessageRes.signature),\n signatureType: signMessageRes.signatureType as 'ed25519',\n });\n }\n\n return results;\n };\n\n /**\n * Handles the wallet_sessionChanged event.\n * Updates internal state to connected (with correct change event) when the session has Solana scopes,\n * or to disconnected when it does not.\n * @param data - The event data\n */\n async #handleSessionChangedEvent(data: any) {\n if (!isSessionChangedEvent(data)) {\n return;\n }\n\n const sessionScopes = Object.keys(data.params.sessionScopes);\n const hasSolanaScope = sessionScopes.some((scope) => MetamaskWallet.scopes.includes(scope as Scope));\n\n if (hasSolanaScope) {\n this.updateSession(data.params);\n } else {\n // An empty accountsChanged event means that the Solana scope was revoked outside of Wallet Standard.\n // We don't revoke the session in this case to avoid side effects on EVM scopes\n await this.#disconnect({ revokeSession: false });\n }\n }\n\n /**\n * Updates the session and the account to connect to.\n * This method handles the logic for selecting the appropriate Solana network scope (mainnet/devnet/testnet)\n * and account to connect to based on the following priority: mainnet > devnet > testnet. It assumes the same\n * set of accounts is available for all Solana scopes and will take the first account found from the scopes above.\n *\n * @param session - The session data containing available scopes and accounts\n */\n protected updateSession(session: SessionData | undefined) {\n // Get session scopes\n const sessionScopes = new Set(Object.keys(session?.sessionScopes ?? {}));\n\n // Find the first available scope in priority order: mainnet > devnet > testnet.\n const scope = MetamaskWallet.scopes.find((s) => sessionScopes.has(s));\n\n // If no scope is available, don't disconnect so that we can create/update a new session\n if (!scope) {\n this.#account = undefined;\n return;\n }\n const selectedAccountId = session?.sessionScopes[scope]?.accounts?.[0];\n\n // In case the Solana scope is available but without any accounts\n // Could happen if the user already created a session using ethereum injected provider for example or the SDK\n // Don't disconnect so that we can create/update a new session\n if (!selectedAccountId) {\n this.#account = undefined;\n return;\n }\n\n const addressToConnect = getAddressFromCaipAccountId(selectedAccountId);\n\n // Update the account and scope\n const previousAccount = this.#account;\n this.#account = this.#getAccountFromAddress(addressToConnect);\n this.scope = scope;\n if (this.#account.address !== previousAccount?.address) {\n this.#emit('change', { accounts: this.accounts });\n }\n }\n\n #getAccountFromAddress(address: string) {\n return new MetamaskWalletAccount({\n address,\n publicKey: new Uint8Array(bs58.decode(address)),\n chains: this.chains,\n });\n }\n\n #validateSendTransactionInput = (inputs: SolanaSignAndSendTransactionInput[]) => {\n const accountAddress = this.#account?.address;\n const firstChain = inputs[0]?.chain;\n\n for (const {\n account: { address: transactionAddress },\n chain,\n } of inputs) {\n // Verify all transactions are on the same and connected account\n if (transactionAddress !== accountAddress) {\n throw new Error('Invalid transaction addresses');\n }\n // Verify all transactions are on the same chain\n if (chain !== firstChain) {\n throw new Error('All transactions must be on the same chain');\n }\n }\n };\n\n #tryRestoringSession = async (): Promise => {\n try {\n const existingSession = await this.client.getSession();\n\n if (!existingSession) {\n return;\n }\n\n this.updateSession(existingSession);\n } catch (error) {\n console.warn('Error restoring session', error);\n }\n };\n\n #createSession = async (scope: Scope, addresses?: string[]): Promise => {\n const session = await this.client.createSession({\n optionalScopes: {\n [scope]: {\n ...(addresses ? { accounts: addresses.map((address) => `${scope}:${address}` as CaipAccountId) } : {}),\n methods: [],\n notifications: [],\n },\n },\n sessionProperties: {\n // Previously this was needed to enable metamask_accountsChanged events for Solana.\n // This isn't needed for that purpose since we now use wallet_sessionChanged events.\n // However this is still needed to help the wallet identify our injected solana provider\n // until we migrate to a more accurate property name.\n // See: https://github.com/MetaMask/metamask-extension/blob/70dd748af54b58ceb8e78d227b6bdf118fb8e7ba/ui/pages/multichain-accounts/multichain-accounts-connect-page/multichain-accounts-connect-page.tsx#L169-L174\n solana_accountChanged_notifications: true,\n },\n });\n\n this.updateSession(session);\n };\n}\n"]}