Approval Facet

The Approval Facet handles all approval and permit related functions for the Silo.

Call Functions

Approvals

Approve Deposit

function approveDeposit(
    address spender,
    address token,
    uint256 amount
) external payable nonReentrant;

Approves an address to access a Farmer's Deposit.

Parameter	Type	Description
spender	address	Address to be given approval.
token	address	Address of ERC20.
amount	uint256	Amount to be approved.

Increase Deposit Allowance

function increaseDepositAllowance(
    address spender, 
    address token, 
    uint256 addedValue
) public virtual nonReentrant returns (bool);

Increases transfer allowance of a Deposit.

Parameter	Type	Description
spender	address	Address to increase approval for.
token	address	Address of ERC20.
addedValue	uint256	Additional approval value to be given.

Return Value	Description
bool	If the allowance increase was successful.

Decrease Deposit Allowance

function decreaseDepositAllowance(
    address spender, 
    address token, 
    uint256 subtractedValue
) public virtual nonReentrant returns (bool);

Decreases transfer allowance of a Deposit.

Parameter	Type	Description
spender	address	Address to decrease approval for.
token	address	Address of ERC20.
subtractedValue	uint256	Amount of approval value to be removed.

Return Value	Description
bool	Success.

Permits

Farm balances and Silo Deposits support EIP-2612 permits, which allows Farmers to delegate use of their Farm balances and Silo Deposits through permits without the need for a separate transaction.

Permit Deposits

function permitDeposits(
    address owner,
    address spender,
    address[] calldata tokens,
    uint256[] calldata values,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
) external payable nonReentrant;

Permits multiple Deposits.

Parameter	Type	Description
owner	address	Owner of the Deposit.
spender	address	Address to permit.
tokens	address[]	Array of ERC20s to permit.
values	uint256[]	Array of amount (corresponding to tokens) to permit.
deadline	uint256	Expiration of signature (Unix time).
v	uint8	Recovery ID.
r	bytes32	ECDSA signature output.
s	bytes32	ECDSA signature output.

Permit Deposit

function permitDeposit(
    address owner,
    address spender,
    address token,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
) external payable nonReentrant;

Permits a single Deposit.

Parameter	Type	Description
owner	address	Owner of the Deposit.
spender	address	Address to permit.
token	address	ERC20 to permit.
value	uint256	Amount of token to permit.
deadline	uint256	Expiration of signature (Unix time).
v	uint8	Recovery ID.
r	bytes32	ECDSA signature output.
s	bytes32	ECDSA signature output.

Set Approval for All

function setApprovalForAll(
    address spender, 
    bool approved
) external;

Set ERC-1155 approvals. Grants or revokes permission to operator to transfer the caller’s tokens, according to approved.

Parameter	Type	Description
spender	address	Address to approve spending for.
approved	bool	Whether or not to approve.

View Functions

Deposit Permit Nonces

function depositPermitNonces(address owner) public view virtual returns (uint256);

Returns the current nonce for Deposit permits.

Parameter	Type	Description
owner	address	Owner of the Deposit.

Return Value	Description
uint256	Current nonce for Deposit permits.

Deposit Permit Domain Separator

function depositPermitDomainSeparator() external view returns (bytes32);

Returns the domain separator for the current chain (link).

Return Value	Description
bytes32	The domain separator for the current chain.

Deposit Allowance

function depositAllowance(
    address owner,
    address spender,
    address token
) public view virtual returns (uint256);

Returns how much of a token Deposit that spender can transfer on behalf of owner.

Parameter	Type	Description
owner	address	Owner of the Deposit.
spender	address	The address that can spend the Deposit.
token	address	The token Deposit that spender can transfer.

Return Value	Description
uint256	The token Deposit amount that spender can transfer on behalf of owner.

Is Approved for All

function isApprovedForAll(
    address _owner, 
    address _operator
) external view returns (bool);

Returns true if _operator is approved to transfer _owner's Deposit.

Parameter	Type	Description
_owner	address	Owner of the Deposit.
_operator	address	Spender of the Deposit.

Return Value	Description
bool	True if _operator is approved to transfer _owner's tokens.

Events

Deposit Approval

event DepositApproval(
    address indexed owner,
    address indexed spender,
    address token,
    uint256 amount
);

Emitted when a Deposit is approved to spend by another account.

Parameter	Type	Description
owner	address	Owner of the Deposit.
spender	address	Spender of the Deposit.
token	address	Deposit token that can be spent.
amount	uint256	Amount of the Deposit token that can be spent.

Approval for All

event ApprovalForAll(address indexed account, address indexed operator, bool approved);

Emitted when account grants or revokes permission to operator to transfer their tokens, according to approved (link).

Parameter	Type	Description
account	address	Owner of the Deposit.
operator	address	Spender of the Deposit.
approved	address	Whether or not the Deposit was approved.