cdk-nag
Version:
Check CDK v2 applications for best practices using a combination on available rule packs.
47 lines • 7.42 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.flattenCfnReference = void 0;
/**
* Turns a CloudFormation reference object into a flat string for easy suppression
* @param node The reference object
* @returns Flattened string
*/
exports.flattenCfnReference = (reference) => {
const visit = (node) => {
if (typeof node === 'undefined') {
return '';
}
if (typeof node === 'string') {
// Replace the template syntax that Fn::Sub uses with round brackets for easier suppression
return node.replace(/\${/g, '<').replace(/}/g, '>');
}
if (isCfnFnJoin(node)) {
const [delimiter, items] = node['Fn::Join'];
return items.map(visit).join(delimiter);
}
if (isCfnFnSub(node)) {
return visit(node['Fn::Sub']);
}
if (isCfnFnGetAtt(node)) {
const [resource, attribute] = node['Fn::GetAtt'];
return `<${visit(resource)}.${visit(attribute)}>`;
}
if (isCfnFnImportValue(node)) {
return visit(node['Fn::ImportValue']);
}
if (isCfnRef(node)) {
return `<${visit(node.Ref)}>`;
}
// fallback
return JSON.stringify(node);
};
return visit(reference);
};
// Checks if an object is a certain type by testing for the existence of a field
const checkType = (field) => (node) => !!node[field];
const isCfnFnJoin = checkType('Fn::Join');
const isCfnFnSub = checkType('Fn::Sub');
const isCfnFnGetAtt = checkType('Fn::GetAtt');
const isCfnFnImportValue = checkType('Fn::ImportValue');
const isCfnRef = checkType('Ref');
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