@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
104 lines (103 loc) • 4.3 kB
JavaScript
import { DirectiveLocation, GraphQLError, Kind, OperationTypeNode, specifiedDirectives, } from "graphql";
export function KnownDirectivesRule(context) {
const locationsMap = new Map();
const astDefinitions = context.getDocument().definitions;
for (const def of astDefinitions) {
if (def.kind === Kind.DIRECTIVE_DEFINITION) {
locationsMap.set(def.name.value, new Set(def.locations.map((name) => name.value)));
}
}
for (const specifiedDirective of specifiedDirectives) {
if (!locationsMap.has(specifiedDirective.name)) {
locationsMap.set(specifiedDirective.name, new Set(specifiedDirective.locations.map((loc) => String(loc))));
}
}
return {
Directive(node, _key, _parent, _path, ancestors) {
const name = node.name.value;
const locations = locationsMap.get(name);
if (!locations) {
context.reportError(new GraphQLError(`Unknown directive "@${name}".`, {
nodes: node,
extensions: {
code: "INVALID_GRAPHQL",
},
}));
return;
}
const candidateLocation = getDirectiveLocationForASTPath(ancestors);
if (candidateLocation && !locations.has(candidateLocation)) {
context.reportError(new GraphQLError(`Directive "@${name}" may not be used on ${candidateLocation}.`, {
nodes: node,
extensions: {
code: "INVALID_GRAPHQL",
},
}));
}
},
};
}
function getDirectiveLocationForASTPath(ancestors) {
const appliedTo = ancestors[ancestors.length - 1];
if (!("kind" in appliedTo)) {
throw new Error("Expected a node");
}
switch (appliedTo.kind) {
case Kind.OPERATION_DEFINITION:
return getDirectiveLocationForOperation(appliedTo.operation);
case Kind.FIELD:
return DirectiveLocation.FIELD;
case Kind.FRAGMENT_SPREAD:
return DirectiveLocation.FRAGMENT_SPREAD;
case Kind.INLINE_FRAGMENT:
return DirectiveLocation.INLINE_FRAGMENT;
case Kind.FRAGMENT_DEFINITION:
return DirectiveLocation.FRAGMENT_DEFINITION;
case Kind.VARIABLE_DEFINITION:
return DirectiveLocation.VARIABLE_DEFINITION;
case Kind.SCHEMA_DEFINITION:
case Kind.SCHEMA_EXTENSION:
return DirectiveLocation.SCHEMA;
case Kind.SCALAR_TYPE_DEFINITION:
case Kind.SCALAR_TYPE_EXTENSION:
return DirectiveLocation.SCALAR;
case Kind.OBJECT_TYPE_DEFINITION:
case Kind.OBJECT_TYPE_EXTENSION:
return DirectiveLocation.OBJECT;
case Kind.FIELD_DEFINITION:
return DirectiveLocation.FIELD_DEFINITION;
case Kind.INTERFACE_TYPE_DEFINITION:
case Kind.INTERFACE_TYPE_EXTENSION:
return DirectiveLocation.INTERFACE;
case Kind.UNION_TYPE_DEFINITION:
case Kind.UNION_TYPE_EXTENSION:
return DirectiveLocation.UNION;
case Kind.ENUM_TYPE_DEFINITION:
case Kind.ENUM_TYPE_EXTENSION:
return DirectiveLocation.ENUM;
case Kind.ENUM_VALUE_DEFINITION:
return DirectiveLocation.ENUM_VALUE;
case Kind.INPUT_OBJECT_TYPE_DEFINITION:
case Kind.INPUT_OBJECT_TYPE_EXTENSION:
return DirectiveLocation.INPUT_OBJECT;
case Kind.INPUT_VALUE_DEFINITION: {
const parentNode = ancestors[ancestors.length - 3];
if (!("kind" in parentNode)) {
throw new Error("Expected a node");
}
return parentNode.kind === Kind.INPUT_OBJECT_TYPE_DEFINITION
? DirectiveLocation.INPUT_FIELD_DEFINITION
: DirectiveLocation.ARGUMENT_DEFINITION;
}
}
}
function getDirectiveLocationForOperation(operation) {
switch (operation) {
case OperationTypeNode.QUERY:
return DirectiveLocation.QUERY;
case OperationTypeNode.MUTATION:
return DirectiveLocation.MUTATION;
case OperationTypeNode.SUBSCRIPTION:
return DirectiveLocation.SUBSCRIPTION;
}
}