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'use strict';
Object.defineProperty(exports, '__esModule', {
value: true,
});
exports.MaxIntrospectionDepthRule = MaxIntrospectionDepthRule;
var _GraphQLError = require('../../error/GraphQLError.js');
var _kinds = require('../../language/kinds.js');
const MAX_LISTS_DEPTH = 3;
function MaxIntrospectionDepthRule(context) {
/**
* Counts the depth of list fields in "__Type" recursively and
* returns `true` if the limit has been reached.
*/
function checkDepth(node, visitedFragments = Object.create(null), depth = 0) {
if (node.kind === _kinds.Kind.FRAGMENT_SPREAD) {
const fragmentName = node.name.value;
if (visitedFragments[fragmentName] === true) {
// Fragment cycles are handled by `NoFragmentCyclesRule`.
return false;
}
const fragment = context.getFragment(fragmentName);
if (!fragment) {
// Missing fragments checks are handled by `KnownFragmentNamesRule`.
return false;
} // Rather than following an immutable programming pattern which has
// significant memory and garbage collection overhead, we've opted to
// take a mutable approach for efficiency's sake. Importantly visiting a
// fragment twice is fine, so long as you don't do one visit inside the
// other.
try {
visitedFragments[fragmentName] = true;
return checkDepth(fragment, visitedFragments, depth);
} finally {
visitedFragments[fragmentName] = undefined;
}
}
if (
node.kind === _kinds.Kind.FIELD && // check all introspection lists
(node.name.value === 'fields' ||
node.name.value === 'interfaces' ||
node.name.value === 'possibleTypes' ||
node.name.value === 'inputFields')
) {
// eslint-disable-next-line no-param-reassign
depth++;
if (depth >= MAX_LISTS_DEPTH) {
return true;
}
} // handles fields and inline fragments
if ('selectionSet' in node && node.selectionSet) {
for (const child of node.selectionSet.selections) {
if (checkDepth(child, visitedFragments, depth)) {
return true;
}
}
}
return false;
}
return {
Field(node) {
if (node.name.value === '__schema' || node.name.value === '__type') {
if (checkDepth(node)) {
context.reportError(
new _GraphQLError.GraphQLError(
'Maximum introspection depth exceeded',
{
nodes: [node],
},
),
);
return false;
}
}
},
};
}
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