eip712-launchpad

This project is used to create, validate and sign a presale operation based on Ethereum.

Functions

1. Presale Struct

The structure where parameters for presale operations are defined. This structure includes the following fields:

• currency: The token to be used in the presale.
• presale_rate: The rate at which tokens will be sold during the presale.
• softcap: The minimum amount required for the presale to be considered successful.
• hardcap: The maximum amount that can be collected during the presale.
• min_buy: The minimum amount a participant can purchase during the presale.
• max_buy: The maximum amount a participant can purchase during the presale.
• liquidity_rate: The percentage of the collected funds that will be allocated to the liquidity pool.
• listing_rate: The rate at which tokens will be listed on the exchange after the presale.
• start_time: The start time of the presale.
• end_time: The end time of the presale.
• lock_end_time: The time when the lock on the collected funds will be released.
• is_vesting: Whether the tokens will be subject to vesting.
• is_lock: Whether the collected funds are locked.
• refund: Whether participants can request a refund if the softcap is not reached.
• auto_listing: Whether the token will be automatically listed on the exchange after the presale.

2. check_params()

This function validates the given Presale instance. If all parameters are correct, it returns Ok(()); otherwise, it returns the respective error.

3. calculate_amount()

This function calculates the total token amount based on pre-established presale and listing rates.

4. get_token_info()

This function checks the token amount owned by the given address. If the specified amount of balance and allowance are available, it returns Ok(()); otherwise, it returns an error.

###5. sign() This function signs the given Presale instance and returns the result of the signature. If the signature is successful, it returns the string representation of the signature; otherwise, it returns an error message.

Usage

You can control and sign a presale operation on Ethereum using this library. First, create a presale operation using the Presale structure, then validate the parameters using the check_params() function. Then, calculate necessary amounts and check the balance using the calculate_amount() and get_token_info() functions. Finally, you can sign the presale operation using the sign() function.