@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
54 lines (53 loc) • 2.44 kB
JavaScript
import { GraphQLError, Kind } from 'graphql';
import { print } from '../../../../graphql/printer.js';
import { validateDirectiveAgainstOriginal } from '../../../helpers.js';
export function ExternalRules(context) {
return {
DirectiveDefinition(node) {
validateDirectiveAgainstOriginal(node, 'external', context);
},
Directive(node) {
if (!context.isAvailableFederationDirective('external', node)) {
return;
}
const typeDef = context.typeNodeInfo.getTypeDef();
const fieldDef = context.typeNodeInfo.getFieldDef();
if (!typeDef ||
!(typeDef.kind === Kind.OBJECT_TYPE_DEFINITION ||
typeDef.kind === Kind.OBJECT_TYPE_EXTENSION)) {
return;
}
const fieldDefinitions = [];
if (fieldDef) {
if (fieldDef.kind !== Kind.FIELD_DEFINITION) {
return;
}
fieldDefinitions.push(fieldDef);
}
else {
const fields = typeDef.fields;
if (fields) {
if (context.satisfiesVersionRange('>= v2.0')) {
fieldDefinitions.push(...fields);
}
}
}
for (const field of fieldDefinitions) {
context.markAsExternal(`${typeDef.name.value}.${field.name.value}`);
const conflictingDirectives = field.directives?.filter(directive => context.isAvailableFederationDirective('tag', directive) ||
context.isAvailableFederationDirective('inaccessible', directive));
if (conflictingDirectives?.length && context.satisfiesVersionRange('>= v2.0')) {
for (const directive of conflictingDirectives) {
context.reportError(new GraphQLError(`Cannot apply merged directive ${print(directive).trim()} to external field "${typeDef.name.value}.${field.name.value}"`, {
nodes: node,
extensions: { code: 'MERGED_DIRECTIVE_APPLICATION_ON_EXTERNAL' },
}));
}
}
else {
context.stateBuilder.objectType.field.setExternal(typeDef.name.value, field.name.value);
}
}
},
};
}