approve

Contract: JBToken​‌

Interface: IJBToken

Step by step

Approves an account to spend tokens on the msg.senders behalf.

Definition

function approve(
  uint256 _projectId,
  address _spender,
  uint256 _amount
) external override { ... }

• Arguments:
  • _projectId is the ID of the project to which the token belongs. This is ignored.
  • _spender is the address that will be spending tokens on the msg.senders behalf.
  • _amount is the amount the _spender is allowed to spend.
• The function overrides a function definition from the IJBToken interface.
• The function doesn't return anything.

Body

1. Make sure the project IDs match, or this contract's project ID is 0.

   // Can't approve for a wrong project.
   if (projectId != 0 && _projectId != projectId) revert BAD_PROJECT();

   Internal references:

   • projectId

2. Forward the call to the ERC20 implementation.

   approve(_spender, _amount);

   Inherited references:

   • _mint

Code

/**
  @notice
  Approves an account to spend tokens on the `msg.sender`s behalf.

  @param _projectId the ID of the project to which the token belongs. This is ignored.
  @param _spender The address that will be spending tokens on the `msg.sender`s behalf.
  @param _amount The amount the `_spender` is allowed to spend.
*/
function approve(
  uint256 _projectId,
  address _spender,
  uint256 _amount
) external override {
  // Can't approve for a wrong project.
  if (projectId != 0 && _projectId != projectId) revert BAD_PROJECT();

  approve(_spender, _amount);
}

Errors

String	Description
BAD_PROJECT	Thrown if the project being approved for is not compatible with this contract.

Bug bounty

Category	Description	Reward
Optimization	Help make this operation more efficient.	0.5ETH
Low severity	Identify a vulnerability in this operation that could lead to an inconvenience for a user of the protocol or for a protocol developer.	1ETH
High severity	Identify a vulnerability in this operation that could lead to data corruption or loss of funds.	5+ETH