signAuthorization.ts

import type { Account } from '../../../accounts/types.js'
import {
  type ParseAccountErrorType,
  parseAccount,
} from '../../../accounts/utils/parseAccount.js'
import type {
  SignAuthorizationErrorType as SignAuthorizationErrorType_account,
  SignAuthorizationReturnType as SignAuthorizationReturnType_account,
} from '../../../accounts/utils/signAuthorization.js'
import type { Client } from '../../../clients/createClient.js'
import type { Transport } from '../../../clients/transports/createTransport.js'
import {
  AccountNotFoundError,
  type AccountNotFoundErrorType,
  AccountTypeNotSupportedError,
  type AccountTypeNotSupportedErrorType,
} from '../../../errors/account.js'
import type { ErrorType } from '../../../errors/utils.js'
import type { Chain } from '../../../types/chain.js'
import {
  type PrepareAuthorizationErrorType,
  type PrepareAuthorizationParameters,
  prepareAuthorization,
} from './prepareAuthorization.js'

export type SignAuthorizationParameters<
  account extends Account | undefined = Account | undefined,
> = PrepareAuthorizationParameters<account>

export type SignAuthorizationReturnType = SignAuthorizationReturnType_account

export type SignAuthorizationErrorType =
  | ParseAccountErrorType
  | AccountNotFoundErrorType
  | AccountTypeNotSupportedErrorType
  | PrepareAuthorizationErrorType
  | SignAuthorizationErrorType_account
  | ErrorType

/**
 * Signs an [EIP-7702 Authorization](https://eips.ethereum.org/EIPS/eip-7702) object.
 *
 * With the calculated signature, you can:
 * - use [`verifyAuthorization`](https://viem.sh/experimental/eip7702/verifyAuthorization) to verify the signed Authorization object,
 * - use [`recoverAuthorizationAddress`](https://viem.sh/experimental/eip7702/recoverAuthorizationAddress) to recover the signing address from the signed Authorization object.
 *
 * @param client - Client to use
 * @param parameters - {@link SignAuthorizationParameters}
 * @returns The signed Authorization object. {@link SignAuthorizationReturnType}
 *
 * @example
 * import { createClient, http } from 'viem'
 * import { privateKeyToAccount } from 'viem/accounts'
 * import { mainnet } from 'viem/chains'
 * import { signAuthorization } from 'viem/experimental'
 *
 * const client = createClient({
 *   chain: mainnet,
 *   transport: http(),
 * })
 * const signature = await signAuthorization(client, {
 *   account: privateKeyToAccount('0x..'),
 *   contractAddress: '0xA0Cf798816D4b9b9866b5330EEa46a18382f251e',
 * })
 *
 * @example
 * // Account Hoisting
 * import { createClient, http } from 'viem'
 * import { privateKeyToAccount } from 'viem/accounts'
 * import { mainnet } from 'viem/chains'
 * import { signAuthorization } from 'viem/experimental'
 *
 * const client = createClient({
 *   account: privateKeyToAccount('0x…'),
 *   chain: mainnet,
 *   transport: http(),
 * })
 * const signature = await signAuthorization(client, {
 *   contractAddress: '0xA0Cf798816D4b9b9866b5330EEa46a18382f251e',
 * })
 */
export async function signAuthorization<
  chain extends Chain | undefined,
  account extends Account | undefined,
>(
  client: Client<Transport, chain, account>,
  parameters: SignAuthorizationParameters<account>,
): Promise<SignAuthorizationReturnType> {
  const { account: account_ = client.account } = parameters

  if (!account_)
    throw new AccountNotFoundError({
      docsPath: '/experimental/eip7702/signAuthorization',
    })
  const account = parseAccount(account_)

  if (!account.experimental_signAuthorization)
    throw new AccountTypeNotSupportedError({
      docsPath: '/experimental/eip7702/signAuthorization',
      metaMessages: [
        'The `signAuthorization` Action does not support JSON-RPC Accounts.',
      ],
      type: account.type,
    })

  const authorization = await prepareAuthorization(client, parameters)
  return account.experimental_signAuthorization(authorization)
}