npm package: @rangersprotocolgnosis/safe-core-sdk
Description: Safe Core SDK
Author: rangers
Latest version: 2.1.3

# Safe Core SDK

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Software development kit that facilitates the interaction with the [Gnosis Safe contracts](https://github.com/gnosis/safe-contracts).

## Table of contents
* [Installation](#installation)
* [Build](#build)
* [Getting Started](#getting-started)
* [Safe Factory API Reference](#factory-api)
* [Safe Core SDK API Reference](#sdk-api)
* [License](#license)
* [Contributors](#contributors)

## <a name="installation">Installation</a>

Install the package with yarn or npm:

```bash
yarn install
npm install
```

## <a name="build">Build</a>

Build the package with yarn or npm:

```bash
yarn build
npm build
```

## <a name="getting-started">Getting Started</a>

The following steps show how to set up the Safe Core SDK, deploy a new Safe, create a Safe transaction, generate the required signatures from owners and execute the transaction. However, using the Safe Core SDK alone will not allow for the collection of owner signatures off-chain. To do this and be able to see and confirm the pending transactions shown in the [Gnosis Safe Web App](https://gnosis-safe.io/app/), it is recommended that you follow this other [guide](/packages/guides/integrating-the-safe-core-sdk.md) that covers the use of the Safe Core SDK, combined with the Safe Service Client.

### 1. Instantiate an EthAdapter

First of all, we need to create an `EthAdapter`, which contains all the required utilities for the SDKs to interact with the blockchain. It acts as a wrapper for [web3.js](https://web3js.readthedocs.io/) or [ethers.js](https://docs.ethers.io/v5/) Ethereum libraries.

Depending on the library used by the Dapp, there are two options:

- [Create an `EthersAdapter` instance](https://github.com/gnosis/safe-core-sdk/tree/main/packages/safe-ethers-lib#initialization)
- [Create a `Web3Adapter` instance](https://github.com/gnosis/safe-core-sdk/tree/main/packages/safe-web3-lib#initialization)

Once the instance of `EthersAdapter` or `Web3Adapter` is created, it can be used in the SDK initialization.

### 2. Deploy a new Safe

To deploy a new Safe account instantiate the `SafeFactory` class and call the `deploySafe` method with the right params to configure the new Safe. This includes defining the list of owners and the threshold of the Safe. A Safe account with three owners and threshold equal three will be used as the starting point for this example but any Safe configuration is valid.

```js
import Safe, { SafeFactory, SafeAccountConfig } from '@gnosis.pm/safe-core-sdk'

const safeFactory = await SafeFactory.create({ ethAdapter })

const owners = ['0x<address>', '0x<address>', '0x<address>']
const threshold = 3
const safeAccountConfig: SafeAccountConfig = {
  owners,
  threshold,
  // ...
}

const safeSdk: Safe = await safeFactory.deploySafe({ safeAccountConfig })
```

The `deploySafe` method executes a transaction from the `owner1` account, deploys a new Safe and returns an instance of the Safe Core SDK connected to the new Safe. Check the `deploySafe` method in the [API Reference](#factory-api) for more details on additional configuration parameters and callbacks.

Call the `getAddress` method, for example, to check the address of the newly deployed Safe.

```js
const newSafeAddress = safeSdk.getAddress()
```

To instantiate the Safe Core SDK from an existing Safe just pass to it an instance of the `EthAdapter` class and the Safe address. 

```js
import Safe from '@gnosis.pm/safe-core-sdk'

const safeSdk: Safe = await Safe.create({ ethAdapter: ethAdapterOwner1, safeAddress })
```

Check the `create` method in the [API Reference](#sdk-api) for more details on additional configuration parameters.

### 3. Create a Safe transaction

```js
import { SafeTransactionDataPartial } from '@gnosis.pm/safe-core-sdk-types'

const transaction: SafeTransactionDataPartial = {
  to: '0x<address>',
  value: '<eth_value_in_wei>',
  data: '0x<data>'
}
const safeTransaction = await safeSdk.createTransaction(transaction)
```

Check the `createTransaction` method in the [API Reference](#sdk-api) for additional details on creating MultiSend transactions.

Before executing this transaction, it must be signed by the owners and this can be done off-chain or on-chain. In this example `owner1` will sign it off-chain, `owner2` will sign it on-chain and `owner3` will execute it (the executor also signs the transaction transparently).

### 3.a. Off-chain signatures

The `owner1` account signs the transaction off-chain.

```js
const owner1Signature = await safeSdk.signTransaction(safeTransaction)
```

Because the signature is off-chain, there is no interaction with the contract and the signature becomes available at `safeTransaction.signatures`.

### 3.b. On-chain signatures

To connect `owner2` to the Safe we need to create a new instance of the class `EthAdapter` passing to its constructor the owner we would like to connect. After `owner2` account is connected to the SDK as a signer the transaction hash will be approved on-chain.

```js
const ethAdapterOwner2 = new EthersAdapter({ ethers, signer: owner2 })
const safeSdk2 = await safeSdk.connect({ ethAdapter: ethAdapterOwner2, safeAddress })
const txHash = await safeSdk2.getTransactionHash(safeTransaction)
const approveTxResponse = await safeSdk2.approveTransactionHash(txHash)
await approveTxResponse.transactionResponse?.wait()
```

### 4. Transaction execution

Lastly, `owner3` account is connected to the SDK as a signer and executor of the Safe transaction to execute it.

```js
const ethAdapterOwner3 = new EthersAdapter({ ethers, signer: owner3 })
const safeSdk3 = await safeSdk2.connect({ ethAdapter: ethAdapterOwner3, safeAddress })
const executeTxResponse = await safeSdk3.executeTransaction(safeTransaction)
await executeTxResponse.transactionResponse?.wait()
```

All the signatures used to execute the transaction are now available at `safeTransaction.signatures`.

## <a name="factory-api">Safe Factory API Reference</a>

### create

Returns an instance of the Safe Factory.

```js
import { SafeFactory } from '@gnosis.pm/safe-core-sdk'

const safeFactory = await SafeFactory.create({ ethAdapter })
```

* The `isL1SafeMasterCopy` flag

  There are two versions of the Safe contracts: [GnosisSafe.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafe.sol) that does not trigger events in order to save gas and [GnosisSafeL2.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafeL2.sol) that does, which is more appropriate for L2 networks.

  By default `GnosisSafe.sol` will be only used on Ethereum Mainnet. For the rest of the networks where the Safe contracts are already deployed, the `GnosisSafeL2.sol` contract will be used unless you add the `isL1SafeMasterCopy` flag to force the use of the `GnosisSafe.sol` contract.

  ```js
  const safeFactory = await SafeFactory.create({ ethAdapter, isL1SafeMasterCopy: true })
  ```

* The `contractNetworks` property

  If the Safe contracts are not deployed to your current network, the `contractNetworks` property will be required to point to the addresses of the Safe contracts previously deployed by you.

  ```js
  import { ContractNetworksConfig } from '@gnosis.pm/safe-core-sdk'

  const id = await ethAdapter.getChainId()
  const contractNetworks: ContractNetworksConfig = {
    [id]: {
      multiSendAddress: '<MULTI_SEND_ADDRESS>',
      safeMasterCopyAddress: '<MASTER_COPY_ADDRESS>',
      safeProxyFactoryAddress: '<PROXY_FACTORY_ADDRESS>'
    }
  }

  const safeFactory = await SafeFactory.create({ ethAdapter, contractNetworks })
  ```

* The `safeVersion` property

  The `SafeFactory` constructor also accepts the `safeVersion` property to specify the Safe contract version that will be deployed. This string can take the values `1.1.1`, `1.2.0` or `1.3.0`. If not specified, the most recent contract version will be used by default.

  ```js
  const safeVersion = 'X.Y.Z'
  const safeFactory = await SafeFactory.create({ ethAdapter, safeVersion })
  ```

### deploySafe

Deploys a new Safe and returns an instance of the Safe Core SDK connected to the deployed Safe. The address of the Master Copy, Safe contract version and the contract (`GnosisSafe.sol` or `GnosisSafeL2.sol`) of the deployed Safe will depend on the initialization of the `safeFactory` instance.

```js
const safeAccountConfig: SafeAccountConfig = {
  owners,
  threshold,
  to, // Optional
  data, // Optional
  fallbackHandler, // Optional
  paymentToken, // Optional
  payment, // Optional
  paymentReceiver // Optional
}

const safeSdk = await safeFactory.deploySafe({ safeAccountConfig })
```

This method can optionally receive the `safeDeploymentConfig` parameter to define the `saltNonce`.

```js
const safeAccountConfig: SafeAccountConfig = {
  owners,
  threshold,
  to, // Optional
  data, // Optional
  fallbackHandler, // Optional
  paymentToken, // Optional
  payment, // Optional
  paymentReceiver // Optional
}
const safeDeploymentConfig: SafeDeploymentConfig = { saltNonce }

const safeSdk = await safeFactory.deploySafe({ safeAccountConfig, safeDeploymentConfig })
```

Optionally, some properties can be passed as execution options:

```js
const options: Web3TransactionOptions = {
  from, // Optional
  gas, // Optional
  gasPrice // Optional
}
```
```js
const options: EthersTransactionOptions = {
  from, // Optional
  gasLimit, // Optional
  gasPrice // Optional
}
```
```js
const safeSdk = await safeFactory.deploySafe({ safeAccountConfig, safeDeploymentConfig, options })
```

It can also take an optional callback which receives the `txHash` of the Safe deployment transaction prior to returning a new instance of the Safe Core SDK:

```js
const callback = (txHash: string): void => {
  console.log({ txHash })
}

const safeSdk = await safeFactory.deploySafe({ safeAccountConfig, callback })
```

## <a name="sdk-api">Safe Core SDK API Reference</a>

### create

Returns an instance of the Safe Core SDK connected to the `safeAddress`.

```js
import Safe from '@gnosis.pm/safe-core-sdk'

const safeSdk = await Safe.create({ ethAdapter, safeAddress })
```

* The `isL1SafeMasterCopy` flag

  There are two versions of the Safe contracts: [GnosisSafe.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafe.sol) that does not trigger events in order to save gas and [GnosisSafeL2.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafeL2.sol) that does, which is more appropriate for L2 networks.

  By default `GnosisSafe.sol` will be only used on Ethereum Mainnet. For the rest of the networks where the Safe contracts are already deployed, the `GnosisSafeL2.sol` contract will be used unless you add the `isL1SafeMasterCopy` flag to force the use of the `GnosisSafe.sol` contract.

  ```js
  const safeSdk = await Safe.create({ ethAdapter, safeAddress, isL1SafeMasterCopy: true })
  ```

* The `contractNetworks` property

  If the Safe contracts are not deployed to your current network, the `contractNetworks` property will be required to point to the addresses of the Safe contracts previously deployed by you.

  ```js
  import { ContractNetworksConfig } from '@gnosis.pm/safe-core-sdk'

  const id = await ethAdapter.getChainId()
  const contractNetworks: ContractNetworksConfig = {
    [id]: {
      multiSendAddress: '<MULTI_SEND_ADDRESS>',
      safeMasterCopyAddress: '<MASTER_COPY_ADDRESS>',
      safeProxyFactoryAddress: '<PROXY_FACTORY_ADDRESS>'
    }
  }

  const safeSdk = await Safe.create({ ethAdapter, safeAddress, contractNetworks })
  ```

### connect

Returns a new instance of the Safe Core SDK connected to the `safeAddress`.

```js
const safeSdk2 = await safeSdk.connect({ ethAdapter, safeAddress })
```

* The `isL1SafeMasterCopy` flag

  There are two versions of the Safe contracts: [GnosisSafe.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafe.sol) that does not trigger events in order to save gas and [GnosisSafeL2.sol](https://github.com/gnosis/safe-contracts/blob/v1.3.0/contracts/GnosisSafeL2.sol) that does, which is more appropriate for L2 networks.

  By default `GnosisSafe.sol` will be only used on Ethereum Mainnet. For the rest of the networks where the Safe contracts are already deployed, the `GnosisSafeL2.sol` contract will be used unless you add the `isL1SafeMasterCopy` flag to force the use of the `GnosisSafe.sol` contract.

  ```js
  const safeSdk = await Safe.connect({ ethAdapter, safeAddress, isL1SafeMasterCopy: true })
  ```

* The `contractNetworks` property

  If the Safe contracts are not deployed to your current network, the `contractNetworks` property will be required to point to the addresses of the Safe contracts previously deployed by you.

  ```js
  const contractNetworks: ContractNetworksConfig = {
    [chainId]: {
      multiSendAddress: '<MULTI_SEND_ADDRESS>',
      safeMasterCopyAddress: '<MASTER_COPY_ADDRESS>',
      safeProxyFactoryAddress: '<PROXY_FACTORY_ADDRESS>'
    }
  }
  const safeSdk = await Safe.connect({ ethAdapter, safeAddress, contractNetworks })
  ```

### getAddress

Returns the address of the current Safe Proxy contract.

```js
const address = safeSdk.getAddress()
```

### getContractVersion

Returns the Safe Master Copy contract version.

```js
const contractVersion = await safeSdk.getContractVersion()
```

### getOwners

Returns the list of Safe owner accounts.

```js
const owners = await safeSdk.getOwners()
```

### getNonce

Returns the Safe nonce.

```js
const nonce = await safeSdk.getNonce()
```

### getThreshold

Returns the Safe threshold.

```js
const threshold = await safeSdk.getThreshold()
```

### getChainId

Returns the chainId of the connected network.

```js
const chainId = await safeSdk.getChainId()
```

### getBalance

Returns the ETH balance of the Safe.

```js
const balance = await safeSdk.getBalance()
```

### getModules

Returns the list of addresses of all the enabled Safe modules.

```js
const modules = await safeSdk.getModules()
```

### isModuleEnabled

Checks if a specific Safe module is enabled for the current Safe.

```js
const isEnabled = await safeSdk.isModuleEnabled(moduleAddress)
```

### isOwner

Checks if a specific address is an owner of the current Safe.

```js
const isOwner = await safeSdk.isOwner(address)
```

### createTransaction

Returns a Safe transaction ready to be signed by the owners and executed. The Safe Core SDK supports the creation of single Safe transactions but also MultiSend transactions.

* **Single transactions**

  This method can take an object of type `SafeTransactionDataPartial` that represents the transaction we want to execute (once the signatures are collected). It accepts some optional properties as follows.

  ```js
  import { SafeTransactionDataPartial } from '@gnosis.pm/safe-core-sdk-types'

  const transaction: SafeTransactionDataPartial = {
    to,
    data,
    value,
    operation, // Optional
    safeTxGas, // Optional
    baseGas, // Optional
    gasPrice, // Optional
    gasToken, // Optional
    refundReceiver, // Optional
    nonce // Optional
  }
  const safeTransaction = await safeSdk.createTransaction(transaction)
  ```

* **MultiSend transactions**

  This method can take an array of `MetaTransactionData` objects that represent the multiple transactions we want to include in our MultiSend transaction. If we want to specify some of the optional properties in our MultiSend transaction, we can pass a second argument to the `createTransaction` method with the `SafeTransactionOptionalProps` object.

  ```js
  const transactions: MetaTransactionData[] = [
    {
      to,
      data,
      value,
      operation // Optional
    },
    {
      to,
      data,
      value,
      operation // Optional
    },
    // ...
  ]
  const safeTransaction = await safeSdk.createTransaction(transactions)
  ```

  This method can also receive the `options` parameter to set the optional properties in the MultiSend transaction:

  ```js
  const transactions: MetaTransactionData[] = [
    {
      to,
      data,
      value,
      operation // Optional
    },
    {
      to,
      data,
      value,
      operation // Optional
    },
    // ...
  ]
  const options: SafeTransactionOptionalProps = {
    safeTxGas, // Optional
    baseGas, // Optional
    gasPrice, // Optional
    gasToken, // Optional
    refundReceiver, // Optional
    nonce // Optional
  }
  const safeTransaction = await safeSdk.createTransaction(transactions, options)
  ```

If the optional properties are not manually set, the Safe transaction returned will have the default value for each one:

* `operation`: `OperationType.Call` (0) is the default value.
* `safeTxGas`: The right gas estimation is the default value.
* `baseGas`: 0 is the default value.
* `gasPrice`: 0 is the default value.
* `gasToken`: 0x address is the default value.
* `refundReceiver`: 0x address is the default value.
* `nonce`: The current Safe nonce is the default value.

Read more about the [Safe transaction properties](https://docs.gnosis.io/safe/docs/contracts_tx_execution/).

### createRejectionTransaction

Returns a Safe transaction ready to be signed by the owners that invalidates the pending Safe transaction/s with a specific nonce.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const rejectionTransaction = await safeSdk.createRejectionTransaction(safeTransaction.data.nonce)
```

### getTransactionHash

Returns the transaction hash of a Safe transaction.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const txHash = await safeSdk.getTransactionHash(safeTransaction)
```

### signTransactionHash

Signs a hash using the current owner account.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const txHash = await safeSdk.getTransactionHash(safeTransaction)
const signature = await safeSdk.signTransactionHash(txHash)
```

### signTransaction

Adds the signature of the current owner to the Safe transaction object.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
await safeSdk.signTransaction(safeTransaction)
```

### approveTransactionHash

Approves a hash on-chain using the current owner account.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const txHash = await safeSdk.getTransactionHash(safeTransaction)
const txResponse = await safeSdk.approveTransactionHash(txHash)
await txResponse.transactionResponse?.wait()
```

Optionally, some properties can be passed as execution options:

```js
const options: Web3TransactionOptions = {
  from, // Optional
  gas, // Optional
  gasPrice // Optional
}
```
```js
const options: EthersTransactionOptions = {
  from, // Optional
  gasLimit, // Optional
  gasPrice // Optional
}
```
```js
const txResponse = await safeSdk.approveTransactionHash(txHash, options)
```

### getOwnersWhoApprovedTx

Returns a list of owners who have approved a specific Safe transaction.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const txHash = await safeSdk.getTransactionHash(safeTransaction)
const owners = await safeSdk.getOwnersWhoApprovedTx(txHash)
```

### getEnableModuleTx

Returns a Safe transaction ready to be signed that will enable a Safe module.

```js
const safeTransaction = await safeSdk.getEnableModuleTx(moduleAddress)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = {
  safeTxGas, // Optional
  baseGas, // Optional
  gasPrice, // Optional
  gasToken, // Optional
  refundReceiver, // Optional
  nonce // Optional
}
const safeTransaction = await safeSdk.getEnableModuleTx(moduleAddress, options)
```

### getDisableModuleTx

Returns a Safe transaction ready to be signed that will disable a Safe module.

```js
const safeTransaction = await safeSdk.getDisableModuleTx(moduleAddress)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = { ... }
const safeTransaction = await safeSdk.getDisableModuleTx(moduleAddress, options)
```

### getAddOwnerTx

Returns the Safe transaction to add an owner and optionally change the threshold.

```js
const params: AddOwnerTxParams = {
  ownerAddress,
  threshold // Optional. If `threshold` is not provided the current threshold will not change.
}
const safeTransaction = await safeSdk.getAddOwnerTx(params)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = { ... }
const safeTransaction = await safeSdk.getAddOwnerTx(params, options)
```

### getRemoveOwnerTx

Returns the Safe transaction to remove an owner and optionally change the threshold.

```js
const params: RemoveOwnerTxParams = {
  ownerAddress,
  newThreshold // Optional. If `newThreshold` is not provided, the current threshold will be decreased by one.
}
const safeTransaction = await safeSdk.getRemoveOwnerTx(params)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = { ... }
const safeTransaction = await safeSdk.getRemoveOwnerTx(params, options)
```

### getSwapOwnerTx

Returns the Safe transaction to replace an owner of the Safe with a new one.

```js
const params: SwapOwnerTxParams = {
  oldOwnerAddress,
  newOwnerAddress
}
const safeTransaction = await safeSdk.getSwapOwnerTx(params)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = { ... }
const safeTransaction = await safeSdk.getSwapOwnerTx(params, options)
```

### getChangeThresholdTx

Returns the Safe transaction to change the threshold.

```js
const safeTransaction = await safeSdk.getChangeThresholdTx(newThreshold)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

This method can optionally receive the `options` parameter:

```js
const options: SafeTransactionOptionalProps = { ... }
const safeTransaction = await safeSdk.getChangeThresholdTx(newThreshold, options)
```

### executeTransaction

Executes a Safe transaction.

```js
const transaction: SafeTransactionDataPartial = {
  // ...
}
const safeTransaction =  await safeSdk.createTransaction(transaction)
const txResponse = await safeSdk.executeTransaction(safeTransaction)
await txResponse.transactionResponse?.wait()
```

Optionally, some properties can be passed as execution options:

```js
const options: Web3TransactionOptions = {
  from, // Optional
  gas, // Optional
  gasPrice // Optional
}
```
```js
const options: EthersTransactionOptions = {
  from, // Optional
  gasLimit, // Optional
  gasPrice // Optional
}
```
```js
const txResponse = await safeSdk.executeTransaction(safeTransaction, options)
```

## <a name="license">License</a>

This library is released under MIT.

## <a name="contributors">Contributors</a>

- Germán Martínez ([germartinez](https://github.com/germartinez))