为什么我的 API Gateway 代理资源使用已激活缓存的 Lambda 授权方返回 HTTP 403“User is not authorized to access this resource”（用户无权访问此资源）错误？

"arn:aws:execute-api:<region>:<account>:<API_id>/<stage>/<httpVerb>/[<resource-name>/[<child-resources>]]"

exports.handler =  function(event, context, callback) {
    var token = event.authorizationToken;
    var tmp = event.methodArn.split(':');
    var apiGatewayArnTmp = tmp[5].split('/');
    
    // Create wildcard resource
    var resource = tmp[0] + ":" + tmp[1] + ":" + tmp[2] + ":" + tmp[3] + ":" + tmp[4] + ":" + apiGatewayArnTmp[0] + '/*/*'; 
    switch (token) {
        case 'allow':
            callback(null, generatePolicy('user', 'Allow', resource));
            break;
        case 'deny':
            callback(null, generatePolicy('user', 'Deny', resource));
            break;
        case 'unauthorized':
            callback("Unauthorized");   // Return a 401 Unauthorized response
            break;
        default:
            callback("Error: Invalid token"); // Return a 500 Invalid token response
    }
};
// Help function to generate an IAM policy
var generatePolicy = function(principalId, effect, resource) {
    var authResponse = {};
    
    authResponse.principalId = principalId;
    if (effect && resource) {
        var policyDocument = {};
        policyDocument.Version = '2012-10-17'; 
        policyDocument.Statement = [];
        var statementOne = {};
        statementOne.Action = 'execute-api:Invoke'; 
        statementOne.Effect = effect;
        statementOne.Resource = resource;
        policyDocument.Statement[0] = statementOne;
        authResponse.policyDocument = policyDocument;
    }
    
    // Optional output with custom properties of the String, Number or Boolean type.
    authResponse.context = {
        "stringKey": "stringval",
        "numberKey": 123,
        "booleanKey": true
    };
    return authResponse;
}

exports.handler = function(event, context, callback) {        
    console.log('Received event:', JSON.stringify(event, null, 2));

    // Retrieve request parameters from the Lambda function input:
    var headers = event.headers;
    var queryStringParameters = event.queryStringParameters;
    var pathParameters = event.pathParameters;
    var stageVariables = event.stageVariables;
        
    // Parse the input for the parameter values
    var tmp = event.methodArn.split(':');
    var apiGatewayArnTmp = tmp[5].split('/');

    // Create wildcard resource
    var resource = tmp[0] + ":" + tmp[1] + ":" + tmp[2] + ":" + tmp[3] + ":" + tmp[4] + ":" + apiGatewayArnTmp[0] + '/*/*'; 
    console.log("resource: " + resource);
    // if (apiGatewayArnTmp[3]) {
    //     resource += apiGatewayArnTmp[3];
    // }
        
    // Perform authorization to return the Allow policy for correct parameters and 
    // the 'Unauthorized' error, otherwise.
    var authResponse = {};
    var condition = {};
    condition.IpAddress = {};
     
    
    if (headers.headerauth1 === "headerValue1"
        && queryStringParameters.QueryString1 === "queryValue1"
        && stageVariables.StageVar1 === "stageValue1") {
        callback(null, generateAllow('me', resource));
    }  else {
        callback("Unauthorized");
    }
}
     
// Help function to generate an IAM policy
var generatePolicy = function(principalId, effect, resource) {
    // Required output:
    console.log("Resource in generatePolicy(): " + resource);
    var authResponse = {};
    authResponse.principalId = principalId;
    if (effect && resource) {
        var policyDocument = {};
        policyDocument.Version = '2012-10-17'; // default version
        policyDocument.Statement = [];
        var statementOne = {};
        statementOne.Action = 'execute-api:Invoke'; // default action
        statementOne.Effect = effect;
        statementOne.Resource = resource;
        console.log("***Resource*** " + resource);
        policyDocument.Statement[0] = statementOne;
        console.log("***Generated Policy*** ");
        console.log(policyDocument);
        authResponse.policyDocument = policyDocument;
    }
    // Optional output with custom properties of the String, Number or Boolean type.
    authResponse.context = {
        "stringKey": "stringval",
        "numberKey": 123,
        "booleanKey": true
    };
    
    return authResponse;
}
     
var generateAllow = function(principalId, resource) {
    return generatePolicy(principalId, 'Allow', resource);
}
     
var generateDeny = function(principalId, resource) {
    return generatePolicy(principalId, 'Deny', resource);
}