FlightBookingNFT Smart Contract

This smart contract implements an NFT-based flight ticketing and resale marketplace with cross-chain capabilities. It leverages Chainlink services for dynamic pricing and secure cross-chain messaging.

Features

• NFT flight tickets (ERC721)
• Dynamic pricing using Chainlink Price Feeds
• Resale marketplace for tickets
• Cross-chain ticket transfers using Chainlink CCIP
• Admin controls for allowlisting and pausing

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Chainlink Integrations

1. Chainlink Price Feed

• Purpose: Fetches real-time AVAX/USD price to set ticket prices dynamically.
• Where Used:
  • Declared as AggregatorV3Interface internal priceFeed;
  • Initialized in the constructor:

    priceFeed = AggregatorV3Interface(FUJI_AVAX_USD);

  • Used in mintFlightTicket() to determine the current ticket price:

    uint256 currentPrice = getCurrentPrice();

  • The getCurrentPrice() function fetches the latest price:

    (, int256 price, , , ) = priceFeed.latestRoundData();
    return uint256(price) * 10**10; // Convert to 18 decimals

• Type: Price Feed

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2. Chainlink CCIP (Cross-Chain Interoperability Protocol)

• Purpose: Enables secure cross-chain NFT transfers and message passing.
• Where Used:
  • The contract inherits from CCIPReceiver:

    contract FlightBookingNFT is ... CCIPReceiver

  • Initialized in the constructor:

    CCIPReceiver(_router)

  • Sending cross-chain messages in transferTicketCrossChain():

    Client.EVM2AnyMessage memory evm2AnyMessage = Client.EVM2AnyMessage({...});
    IRouterClient router = IRouterClient(this.getRouter());
    uint256 fees = router.getFee(destinationChainSelector, evm2AnyMessage);
    router.ccipSend{value: fees}(destinationChainSelector, evm2AnyMessage);

  • Receiving cross-chain messages in _ccipReceive():

    function _ccipReceive(Client.Any2EVMMessage memory any2EvmMessage) internal override

• Type: CCIP (Cross-Chain Messaging)

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Quick Start

1. Install dependencies (OpenZeppelin, Chainlink).
2. Deploy with router address and initial owner.
3. Mint tickets using mintFlightTicket.
4. List for resale or transfer cross-chain as needed.

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Security

• Only allowlisted chains and senders can interact cross-chain.
• Tickets cannot be resold or transferred after use or after flight departure.

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License

MIT