[ERC7654] リクエストメソッドをもとにコントラクトの構造を管理する仕組みを理解しよう！

// SPDX-License-Identifier: CC0-1.0
pragma solidity >=0.8.0;
import "./Types.sol";
interface IRequestMethodTypes{

    /**
     * Requested method type.
     * GET, POST, PUT, OPTIONS
     */
    enum MethodTypes{
        GET,
        POST,
        PUT,
        OPTIONS
    }

    /**
     * Response data event.
     * @param _response is the response value of the post request or put request.
     */
    event Response(bytes _response);

    /**
     * Get method names based on request method type.
     * @param _methodTypes is the request method type.
     * @return Method names.
     */
    function getMethods(MethodTypes _methodTypes)external view returns (string[] memory);

    /**
     * Get the data types of request parameters and responses based on the requested method name.
     * @param _methodName is the method name.
     * @return Data types of request parameters and responses.
     */
    function getMethodReqAndRes(string memory _methodName) external view returns(Types.Type[] memory ,Types.Type[] memory );

    /**
     * Request the contract to retrieve records.
     * @param _methodName is the method name.
     * @param _methodReq is the method type.
     * @return The response to the get request.
     */
    function get(string memory _methodName,bytes memory _methodReq)external view returns(bytes memory);

    /**
     * Request the contract to create a new record.
     * @param _methodName is the method name.
     * @param _methodReq is the method type.
     * @return The response to the post request.
     */
    function post(string memory _methodName,bytes memory _methodReq)external returns(bytes memory);

    /**
     * Request the contract to update a record.
     * @param _methodName is the method name.
     * @param _methodReq is the method type.
     * @return The response to the put request.
     */
    function put(string memory _methodName,bytes memory _methodReq)external returns(bytes memory);

    /**
     * Supported request method types.
     * @return Method types.
     */
    function options()external returns(MethodTypes[] memory);
}

struct RequestParameter {
  string paramName;
  uint256 paramValue;
}

function decodeRequest(bytes memory encodedRequest) public pure returns (RequestParameter memory) {
  return abi.decode(encodedRequest, (RequestParameter));
}

struct Response {
  bool success;
  string message;
}

function encodeResponse(Response memory response) public pure returns (bytes memory) {
  return abi.encode(response);
}

// SPDX-License-Identifier: CC0-1.0
pragma solidity >=0.8.0;
import "./Types.sol";
import "./IRequestMethodTypes.sol";
contract RequestMethodTypes is IRequestMethodTypes{

    //@dev define the data type of this component
    struct Profiles{
        string name;
        uint256 age;
    }

    mapping (address=>Profiles) users;

    //@dev Types contains all data types in solidity
    mapping (string=>Types.Type[]) methodRequests;
    mapping (string=>Types.Type[]) methodResponses;
    mapping (MethodTypes=>string[]) methods;

    constructor(){
        Types.Type[] memory getReqArray = new Types.Type[](1);
        getReqArray[0] = Types.Type.ADDRESS;
        Types.Type[] memory dataTypeArray = new Types.Type[](2);
        dataTypeArray[0] = Types.Type.STRING;
        dataTypeArray[1] = Types.Type.UINT256;
        Types.Type[] memory putReqArray = new Types.Type[](2);
        putReqArray[0] = Types.Type.ADDRESS;
        putReqArray[1] = Types.Type.STRING;
        // @dev initialize get, post, put request parameter data types and response data types
        setMethod("getUser",MethodTypes.GET,getReqArray,dataTypeArray);
        setMethod("createUser",MethodTypes.POST,dataTypeArray,new Types.Type[](0));
        setMethod("updateUserName",MethodTypes.PUT,putReqArray,new Types.Type[](0));
    }

    function setMethod(string memory _methodName,MethodTypes _methodType,Types.Type[] memory _methodReq,Types.Type[] memory _methodRes)  private  {
        methods[_methodType].push(_methodName);
        methodRequests[_methodName]=_methodReq;
        methodResponses[_methodName]=_methodRes;
    }

    function getMethodReqAndRes(string memory _methodName)public view returns(Types.Type[] memory ,Types.Type[] memory ){
        return(
            methodRequests[_methodName],
            methodResponses[_methodName]
        );
    }
    
    function getMethods(MethodTypes _methodTypes)public view returns (string[] memory){
        return methods[_methodTypes];
    } 

    function get(string memory _methodName,bytes memory _methodReq)public view returns(bytes memory){
        if(compareStrings(_methodName,"getUser")){
            address user=abi.decode(_methodReq, (address));
            bytes memory userData=abi.encode(users[user].name,users[user].age);
            return userData;
        }else{
            return abi.encode("");
        }  
    }

    function post(string memory _methodName,bytes memory _methodReq)public returns(bytes memory){
        if(compareStrings(_methodName,"createUser")){
            (string memory name,uint256 age)=abi.decode(_methodReq, (string,uint256));
            users[msg.sender]=Profiles(name,age);
            
        }
        return abi.encode("");
    }

    function put(string memory _methodName,bytes memory _methodReq)public returns(bytes memory){
        if(compareStrings(_methodName,"updateUserName")){
            (address userAddress,string memory name)=abi.decode(_methodReq, (address,string));
            require(userAddress==msg.sender);
            users[userAddress].name=name;
        }
        return abi.encode("");
    }
    
    function options()public pure returns(MethodTypes[] memory){
        MethodTypes[] memory methodTypes=new MethodTypes[](4);
        methodTypes[0]=MethodTypes.GET;
        methodTypes[1]=MethodTypes.POST;
        methodTypes[2]=MethodTypes.PUT;
        methodTypes[3]=MethodTypes.OPTIONS;
        return methodTypes;
    }

    //@dev compares two strings for equality
    function compareStrings(string memory _a, string memory _b) private  pure returns (bool) {
        return keccak256(abi.encodePacked(_a)) == keccak256(abi.encodePacked(_b));
    }


}

// ユーザーアドレスと対応するプロフィール
mapping(address => Profiles) users;

// 例:
users[0x123...abc] = Profiles("Alice", 25);
users[0x456...def] = Profiles("Bob", 30);

// メソッド名と対応するリクエストパラメータのデータ型
mapping(string => Types.Type[]) methodRequests;

// 例:
methodRequests["getUser"] = [Types.Type.ADDRESS];
methodRequests["createUser"] = [Types.Type.STRING, Types.Type.UINT256];
methodRequests["updateUserName"] = [Types.Type.ADDRESS, Types.Type.STRING];

// メソッド名と対応するレスポンスパラメータのデータ型
mapping(string => Types.Type[]) methodResponses;

// 例:
methodResponses["getUser"] = [Types.Type.STRING, Types.Type.UINT256];
methodResponses["createUser"] = [];
methodResponses["updateUserName"] = [];

// メソッドタイプと対応するメソッド名のリスト
mapping(MethodTypes => string[]) methods;

// 例:
methods[MethodTypes.GET] = ["getUser"];
methods[MethodTypes.POST] = ["createUser"];
methods[MethodTypes.PUT] = ["updateUserName"];