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420 lines
16 KiB
TypeScript
420 lines
16 KiB
TypeScript
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/type/validate.js
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import find from '../polyfills/find.js';
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import flatMap from '../polyfills/flatMap.js';
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import objectValues from '../polyfills/objectValues.js';
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import inspect from '../jsutils/inspect.js';
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import { GraphQLError } from '../error/GraphQLError.js';
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import { locatedError } from '../error/locatedError.js';
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import { isValidNameError } from '../utilities/assertValidName.js';
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import { isEqualType, isTypeSubTypeOf } from '../utilities/typeComparators.js';
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import { isDirective } from './directives.js';
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import { isIntrospectionType } from './introspection.js';
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import { assertSchema } from './schema.js';
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import { isObjectType, isInterfaceType, isUnionType, isEnumType, isInputObjectType, isNamedType, isNonNullType, isInputType, isOutputType, isRequiredArgument } from './definition.js';
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/**
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* Implements the "Type Validation" sub-sections of the specification's
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* "Type System" section.
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*
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* Validation runs synchronously, returning an array of encountered errors, or
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* an empty array if no errors were encountered and the Schema is valid.
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*/
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export function validateSchema(schema) {
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// First check to ensure the provided value is in fact a GraphQLSchema.
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assertSchema(schema); // If this Schema has already been validated, return the previous results.
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if (schema.__validationErrors) {
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return schema.__validationErrors;
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} // Validate the schema, producing a list of errors.
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const context = new SchemaValidationContext(schema);
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validateRootTypes(context);
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validateDirectives(context);
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validateTypes(context); // Persist the results of validation before returning to ensure validation
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// does not run multiple times for this schema.
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const errors = context.getErrors();
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schema.__validationErrors = errors;
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return errors;
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}
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/**
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* Utility function which asserts a schema is valid by throwing an error if
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* it is invalid.
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*/
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export function assertValidSchema(schema) {
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const errors = validateSchema(schema);
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if (errors.length !== 0) {
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throw new Error(errors.map(error => error.message).join('\n\n'));
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}
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}
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class SchemaValidationContext {
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constructor(schema) {
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this._errors = [];
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this.schema = schema;
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}
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reportError(message, nodes) {
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const _nodes = Array.isArray(nodes) ? nodes.filter(Boolean) : nodes;
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this.addError(new GraphQLError(message, _nodes));
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}
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addError(error) {
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this._errors.push(error);
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}
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getErrors() {
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return this._errors;
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}
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}
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function validateRootTypes(context) {
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const schema = context.schema;
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const queryType = schema.getQueryType();
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if (!queryType) {
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context.reportError('Query root type must be provided.', schema.astNode);
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} else if (!isObjectType(queryType)) {
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context.reportError(`Query root type must be Object type, it cannot be ${inspect(queryType)}.`, getOperationTypeNode(schema, queryType, 'query'));
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}
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const mutationType = schema.getMutationType();
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if (mutationType && !isObjectType(mutationType)) {
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context.reportError('Mutation root type must be Object type if provided, it cannot be ' + `${inspect(mutationType)}.`, getOperationTypeNode(schema, mutationType, 'mutation'));
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}
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const subscriptionType = schema.getSubscriptionType();
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if (subscriptionType && !isObjectType(subscriptionType)) {
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context.reportError('Subscription root type must be Object type if provided, it cannot be ' + `${inspect(subscriptionType)}.`, getOperationTypeNode(schema, subscriptionType, 'subscription'));
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}
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}
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function getOperationTypeNode(schema, type, operation) {
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const operationNodes = getAllSubNodes(schema, node => node.operationTypes);
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for (const node of operationNodes) {
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if (node.operation === operation) {
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return node.type;
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}
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}
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return type.astNode;
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}
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function validateDirectives(context) {
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for (const directive of context.schema.getDirectives()) {
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// Ensure all directives are in fact GraphQL directives.
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if (!isDirective(directive)) {
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context.reportError(`Expected directive but got: ${inspect(directive)}.`, directive?.astNode);
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continue;
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} // Ensure they are named correctly.
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validateName(context, directive); // TODO: Ensure proper locations.
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// Ensure the arguments are valid.
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for (const arg of directive.args) {
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// Ensure they are named correctly.
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validateName(context, arg); // Ensure the type is an input type.
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if (!isInputType(arg.type)) {
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context.reportError(`The type of @${directive.name}(${arg.name}:) must be Input Type ` + `but got: ${inspect(arg.type)}.`, arg.astNode);
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}
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}
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}
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}
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function validateName(context, node) {
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// Ensure names are valid, however introspection types opt out.
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const error = isValidNameError(node.name);
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if (error) {
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context.addError(locatedError(error, node.astNode));
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}
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}
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function validateTypes(context) {
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const validateInputObjectCircularRefs = createInputObjectCircularRefsValidator(context);
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const typeMap = context.schema.getTypeMap();
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for (const type of objectValues(typeMap)) {
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// Ensure all provided types are in fact GraphQL type.
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if (!isNamedType(type)) {
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context.reportError(`Expected GraphQL named type but got: ${inspect(type)}.`, type.astNode);
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continue;
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} // Ensure it is named correctly (excluding introspection types).
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if (!isIntrospectionType(type)) {
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validateName(context, type);
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}
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if (isObjectType(type)) {
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// Ensure fields are valid
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validateFields(context, type); // Ensure objects implement the interfaces they claim to.
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validateInterfaces(context, type);
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} else if (isInterfaceType(type)) {
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// Ensure fields are valid.
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validateFields(context, type); // Ensure interfaces implement the interfaces they claim to.
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validateInterfaces(context, type);
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} else if (isUnionType(type)) {
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// Ensure Unions include valid member types.
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validateUnionMembers(context, type);
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} else if (isEnumType(type)) {
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// Ensure Enums have valid values.
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validateEnumValues(context, type);
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} else if (isInputObjectType(type)) {
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// Ensure Input Object fields are valid.
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validateInputFields(context, type); // Ensure Input Objects do not contain non-nullable circular references
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validateInputObjectCircularRefs(type);
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}
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}
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}
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function validateFields(context, type) {
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const fields = objectValues(type.getFields()); // Objects and Interfaces both must define one or more fields.
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if (fields.length === 0) {
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context.reportError(`Type ${type.name} must define one or more fields.`, getAllNodes(type));
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}
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for (const field of fields) {
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// Ensure they are named correctly.
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validateName(context, field); // Ensure the type is an output type
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if (!isOutputType(field.type)) {
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context.reportError(`The type of ${type.name}.${field.name} must be Output Type ` + `but got: ${inspect(field.type)}.`, field.astNode?.type);
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} // Ensure the arguments are valid
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for (const arg of field.args) {
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const argName = arg.name; // Ensure they are named correctly.
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validateName(context, arg); // Ensure the type is an input type
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if (!isInputType(arg.type)) {
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context.reportError(`The type of ${type.name}.${field.name}(${argName}:) must be Input ` + `Type but got: ${inspect(arg.type)}.`, arg.astNode?.type);
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}
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}
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}
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}
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function validateInterfaces(context, type) {
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const ifaceTypeNames = Object.create(null);
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for (const iface of type.getInterfaces()) {
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if (!isInterfaceType(iface)) {
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context.reportError(`Type ${inspect(type)} must only implement Interface types, ` + `it cannot implement ${inspect(iface)}.`, getAllImplementsInterfaceNodes(type, iface));
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continue;
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}
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if (type === iface) {
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context.reportError(`Type ${type.name} cannot implement itself because it would create a circular reference.`, getAllImplementsInterfaceNodes(type, iface));
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continue;
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}
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if (ifaceTypeNames[iface.name]) {
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context.reportError(`Type ${type.name} can only implement ${iface.name} once.`, getAllImplementsInterfaceNodes(type, iface));
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continue;
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}
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ifaceTypeNames[iface.name] = true;
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validateTypeImplementsAncestors(context, type, iface);
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validateTypeImplementsInterface(context, type, iface);
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}
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}
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function validateTypeImplementsInterface(context, type, iface) {
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const typeFieldMap = type.getFields(); // Assert each interface field is implemented.
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for (const ifaceField of objectValues(iface.getFields())) {
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const fieldName = ifaceField.name;
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const typeField = typeFieldMap[fieldName]; // Assert interface field exists on type.
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if (!typeField) {
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context.reportError(`Interface field ${iface.name}.${fieldName} expected but ${type.name} does not provide it.`, [ifaceField.astNode, ...getAllNodes(type)]);
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continue;
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} // Assert interface field type is satisfied by type field type, by being
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// a valid subtype. (covariant)
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if (!isTypeSubTypeOf(context.schema, typeField.type, ifaceField.type)) {
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context.reportError(`Interface field ${iface.name}.${fieldName} expects type ` + `${inspect(ifaceField.type)} but ${type.name}.${fieldName} ` + `is type ${inspect(typeField.type)}.`, [ifaceField.astNode.type, typeField.astNode.type]);
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} // Assert each interface field arg is implemented.
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for (const ifaceArg of ifaceField.args) {
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const argName = ifaceArg.name;
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const typeArg = find(typeField.args, arg => arg.name === argName); // Assert interface field arg exists on object field.
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if (!typeArg) {
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context.reportError(`Interface field argument ${iface.name}.${fieldName}(${argName}:) expected but ${type.name}.${fieldName} does not provide it.`, [ifaceArg.astNode, typeField.astNode]);
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continue;
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} // Assert interface field arg type matches object field arg type.
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// (invariant)
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// TODO: change to contravariant?
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if (!isEqualType(ifaceArg.type, typeArg.type)) {
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context.reportError(`Interface field argument ${iface.name}.${fieldName}(${argName}:) ` + `expects type ${inspect(ifaceArg.type)} but ` + `${type.name}.${fieldName}(${argName}:) is type ` + `${inspect(typeArg.type)}.`, [ifaceArg.astNode.type, typeArg.astNode.type]);
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} // TODO: validate default values?
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} // Assert additional arguments must not be required.
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for (const typeArg of typeField.args) {
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const argName = typeArg.name;
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const ifaceArg = find(ifaceField.args, arg => arg.name === argName);
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if (!ifaceArg && isRequiredArgument(typeArg)) {
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context.reportError(`Object field ${type.name}.${fieldName} includes required argument ${argName} that is missing from the Interface field ${iface.name}.${fieldName}.`, [typeArg.astNode, ifaceField.astNode]);
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}
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}
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}
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}
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function validateTypeImplementsAncestors(context, type, iface) {
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const ifaceInterfaces = type.getInterfaces();
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for (const transitive of iface.getInterfaces()) {
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if (ifaceInterfaces.indexOf(transitive) === -1) {
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context.reportError(transitive === type ? `Type ${type.name} cannot implement ${iface.name} because it would create a circular reference.` : `Type ${type.name} must implement ${transitive.name} because it is implemented by ${iface.name}.`, [...getAllImplementsInterfaceNodes(iface, transitive), ...getAllImplementsInterfaceNodes(type, iface)]);
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}
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}
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}
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function validateUnionMembers(context, union) {
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const memberTypes = union.getTypes();
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if (memberTypes.length === 0) {
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context.reportError(`Union type ${union.name} must define one or more member types.`, getAllNodes(union));
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}
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const includedTypeNames = Object.create(null);
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for (const memberType of memberTypes) {
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if (includedTypeNames[memberType.name]) {
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context.reportError(`Union type ${union.name} can only include type ${memberType.name} once.`, getUnionMemberTypeNodes(union, memberType.name));
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continue;
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}
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includedTypeNames[memberType.name] = true;
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if (!isObjectType(memberType)) {
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context.reportError(`Union type ${union.name} can only include Object types, ` + `it cannot include ${inspect(memberType)}.`, getUnionMemberTypeNodes(union, String(memberType)));
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}
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}
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}
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function validateEnumValues(context, enumType) {
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const enumValues = enumType.getValues();
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if (enumValues.length === 0) {
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context.reportError(`Enum type ${enumType.name} must define one or more values.`, getAllNodes(enumType));
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}
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for (const enumValue of enumValues) {
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const valueName = enumValue.name; // Ensure valid name.
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validateName(context, enumValue);
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if (valueName === 'true' || valueName === 'false' || valueName === 'null') {
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context.reportError(`Enum type ${enumType.name} cannot include value: ${valueName}.`, enumValue.astNode);
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}
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}
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}
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function validateInputFields(context, inputObj) {
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const fields = objectValues(inputObj.getFields());
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if (fields.length === 0) {
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context.reportError(`Input Object type ${inputObj.name} must define one or more fields.`, getAllNodes(inputObj));
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} // Ensure the arguments are valid
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for (const field of fields) {
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// Ensure they are named correctly.
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validateName(context, field); // Ensure the type is an input type
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if (!isInputType(field.type)) {
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context.reportError(`The type of ${inputObj.name}.${field.name} must be Input Type ` + `but got: ${inspect(field.type)}.`, field.astNode?.type);
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}
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}
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}
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function createInputObjectCircularRefsValidator(context) {
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// Modified copy of algorithm from 'src/validation/rules/NoFragmentCycles.js.js'.
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// Tracks already visited types to maintain O(N) and to ensure that cycles
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// are not redundantly reported.
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const visitedTypes = Object.create(null); // Array of types nodes used to produce meaningful errors
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const fieldPath = []; // Position in the type path
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const fieldPathIndexByTypeName = Object.create(null);
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return detectCycleRecursive; // This does a straight-forward DFS to find cycles.
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// It does not terminate when a cycle was found but continues to explore
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// the graph to find all possible cycles.
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function detectCycleRecursive(inputObj) {
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if (visitedTypes[inputObj.name]) {
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return;
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}
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visitedTypes[inputObj.name] = true;
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fieldPathIndexByTypeName[inputObj.name] = fieldPath.length;
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const fields = objectValues(inputObj.getFields());
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for (const field of fields) {
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if (isNonNullType(field.type) && isInputObjectType(field.type.ofType)) {
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const fieldType = field.type.ofType;
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const cycleIndex = fieldPathIndexByTypeName[fieldType.name];
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fieldPath.push(field);
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if (cycleIndex === undefined) {
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detectCycleRecursive(fieldType);
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} else {
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const cyclePath = fieldPath.slice(cycleIndex);
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const pathStr = cyclePath.map(fieldObj => fieldObj.name).join('.');
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context.reportError(`Cannot reference Input Object "${fieldType.name}" within itself through a series of non-null fields: "${pathStr}".`, cyclePath.map(fieldObj => fieldObj.astNode));
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}
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fieldPath.pop();
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}
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}
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fieldPathIndexByTypeName[inputObj.name] = undefined;
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}
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}
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function getAllNodes(object) {
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const {
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astNode,
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extensionASTNodes
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} = object;
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return astNode ? extensionASTNodes ? [astNode].concat(extensionASTNodes) : [astNode] : extensionASTNodes ?? [];
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}
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function getAllSubNodes(object, getter) {
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/* istanbul ignore next (See https://github.com/graphql/graphql-js/issues/2203) */
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return flatMap(getAllNodes(object), item => getter(item) ?? []);
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}
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function getAllImplementsInterfaceNodes(type, iface) {
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return getAllSubNodes(type, typeNode => typeNode.interfaces).filter(ifaceNode => ifaceNode.name.value === iface.name);
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}
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function getUnionMemberTypeNodes(union, typeName) {
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return getAllSubNodes(union, unionNode => unionNode.types).filter(typeNode => typeNode.name.value === typeName);
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} |