Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: GPL-3.0

import {StringsUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol";
import {Base64} from "base64-sol/base64.sol";

/// Shared NFT logic for rendering metadata associated with editions
/// @dev Can safely be used for generic base64Encode and numberToString functions
contract SharedNFTLogic {

    /// @param unencoded bytes to base64-encode
    function base64Encode(bytes memory unencoded)
        public
        pure
        returns (string memory)
    {
        return Base64.encode(unencoded);
    }

    /// Proxy to openzeppelin's toString function
    /// @param value number to return as a string
    function numberToString(uint256 value) public pure returns (string memory) {
        return StringsUpgradeable.toString(value);
    }

    /// Generate edition metadata from storage information as base64-json blob
    /// Combines the media data and metadata
    /// @param name Name of NFT in metadata
    /// @param description Description of NFT in metadata
    /// @param imageUrl URL of image to render for edition
    /// @param animationUrl URL of animation to render for edition
    /// @param tokenOfEdition Token ID for specific token
    /// @param editionSize Size of entire edition to show
    function createMetadataEdition(
        string memory name,
        string memory description,
        string memory imageUrl,
        string memory animationUrl,
        uint256 tokenOfEdition,
        uint256 editionSize
    ) external pure returns (string memory) {
        string memory _tokenMediaData = tokenMediaData(
            imageUrl,
            animationUrl,
            tokenOfEdition
        );
        bytes memory json = createMetadataJSON(
            name,
            description,
            _tokenMediaData,
            tokenOfEdition,
            editionSize
        );
        return encodeMetadataJSON(json);
    }

    /// Function to create the metadata json string for the nft edition
    /// @param name Name of NFT in metadata
    /// @param description Description of NFT in metadata
    /// @param mediaData Data for media to include in json object
    /// @param tokenOfEdition Token ID for specific token
    /// @param editionSize Size of entire edition to show
    function createMetadataJSON(
        string memory name,
        string memory description,
        string memory mediaData,
        uint256 tokenOfEdition,
        uint256 editionSize
    ) public pure returns (bytes memory) {
        bytes memory editionSizeText;
        if (editionSize > 0) {
            editionSizeText = abi.encodePacked(
                "/",
                numberToString(editionSize)
            );
        }
        return
            abi.encodePacked(
                '{"name": "',
                name,
                " ",
                numberToString(tokenOfEdition),
                editionSizeText,
                '", "',
                'description": "',
                description,
                '", "',
                mediaData,
                'properties": {"number": ',
                numberToString(tokenOfEdition),
                ', "name": "',
                name,
                '"}}'
            );
    }

    /// Encodes the argument json bytes into base64-data uri format
    /// @param json Raw json to base64 and turn into a data-uri
    function encodeMetadataJSON(bytes memory json)
        public
        pure
        returns (string memory)
    {
        return
            string(
                abi.encodePacked(
                    "data:application/json;base64,",
                    base64Encode(json)
                )
            );
    }

    /// Generates edition metadata from storage information as base64-json blob
    /// Combines the media data and metadata
    /// @param imageUrl URL of image to render for edition
    /// @param animationUrl URL of animation to render for edition
    function tokenMediaData(
        string memory imageUrl,
        string memory animationUrl,
        uint256 tokenOfEdition
    ) public pure returns (string memory) {
        bool hasImage = bytes(imageUrl).length > 0;
        bool hasAnimation = bytes(animationUrl).length > 0;
        if (hasImage && hasAnimation) {
            return
                string(
                    abi.encodePacked(
                        'image": "',
                        imageUrl,
                        "?id=",
                        numberToString(tokenOfEdition),
                        '", "animation_url": "',
                        animationUrl,
                        "?id=",
                        numberToString(tokenOfEdition),
                        '", "'
                    )
                );
        }
        if (hasImage) {
            return
                string(
                    abi.encodePacked(
                        'image": "',
                        imageUrl,
                        "?id=",
                        numberToString(tokenOfEdition),
                        '", "'
                    )
                );
        }
        if (hasAnimation) {
            return
                string(
                    abi.encodePacked(
                        'animation_url": "',
                        animationUrl,
                        "?id=",
                        numberToString(tokenOfEdition),
                        '", "'
                    )
                );
        }

        return "";
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides a function for encoding some bytes in base64
library Base64 {
    string internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    function encode(bytes memory data) internal pure returns (string memory) {
        if (data.length == 0) return '';
        
        // load the table into memory
        string memory table = TABLE;

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((data.length + 2) / 3);

        // add some extra buffer at the end required for the writing
        string memory result = new string(encodedLen + 32);

        assembly {
            // set the actual output length
            mstore(result, encodedLen)
            
            // prepare the lookup table
            let tablePtr := add(table, 1)
            
            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))
            
            // result ptr, jump over length
            let resultPtr := add(result, 32)
            
            // run over the input, 3 bytes at a time
            for {} lt(dataPtr, endPtr) {}
            {
               dataPtr := add(dataPtr, 3)
               
               // read 3 bytes
               let input := mload(dataPtr)
               
               // write 4 characters
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr( 6, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(        input,  0x3F)))))
               resultPtr := add(resultPtr, 1)
            }
            
            // padding with '='
            switch mod(mload(data), 3)
            case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
            case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
        }
        
        return result;
    }
}

{
  "evmVersion": "berlin",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"bytes","name":"unencoded","type":"bytes"}],"name":"base64Encode","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"description","type":"string"},{"internalType":"string","name":"imageUrl","type":"string"},{"internalType":"string","name":"animationUrl","type":"string"},{"internalType":"uint256","name":"tokenOfEdition","type":"uint256"},{"internalType":"uint256","name":"editionSize","type":"uint256"}],"name":"createMetadataEdition","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"description","type":"string"},{"internalType":"string","name":"mediaData","type":"string"},{"internalType":"uint256","name":"tokenOfEdition","type":"uint256"},{"internalType":"uint256","name":"editionSize","type":"uint256"}],"name":"createMetadataJSON","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes","name":"json","type":"bytes"}],"name":"encodeMetadataJSON","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"numberToString","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"string","name":"imageUrl","type":"string"},{"internalType":"string","name":"animationUrl","type":"string"},{"internalType":"uint256","name":"tokenOfEdition","type":"uint256"}],"name":"tokenMediaData","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"}]

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