/
values.js
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/
values.js
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// @flow strict
import find from '../polyfills/find';
import keyMap from '../jsutils/keyMap';
import inspect from '../jsutils/inspect';
import { type ObjMap } from '../jsutils/ObjMap';
import { GraphQLError } from '../error/GraphQLError';
import { Kind } from '../language/kinds';
import { print } from '../language/printer';
import {
type FieldNode,
type DirectiveNode,
type VariableDefinitionNode,
} from '../language/ast';
import { type GraphQLSchema } from '../type/schema';
import { type GraphQLDirective } from '../type/directives';
import {
type GraphQLField,
isInputType,
isNonNullType,
} from '../type/definition';
import { coerceValue } from '../utilities/coerceValue';
import { typeFromAST } from '../utilities/typeFromAST';
import { valueFromAST } from '../utilities/valueFromAST';
type CoercedVariableValues =
| {| errors: $ReadOnlyArray<GraphQLError> |}
| {| coerced: { [variable: string]: mixed, ... } |};
/**
* Prepares an object map of variableValues of the correct type based on the
* provided variable definitions and arbitrary input. If the input cannot be
* parsed to match the variable definitions, a GraphQLError will be thrown.
*
* Note: The returned value is a plain Object with a prototype, since it is
* exposed to user code. Care should be taken to not pull values from the
* Object prototype.
*/
export function getVariableValues(
schema: GraphQLSchema,
varDefNodes: $ReadOnlyArray<VariableDefinitionNode>,
inputs: { +[variable: string]: mixed, ... },
): CoercedVariableValues {
const errors = [];
const coercedValues = {};
for (const varDefNode of varDefNodes) {
const varName = varDefNode.variable.name.value;
const varType = typeFromAST(schema, varDefNode.type);
if (!isInputType(varType)) {
// Must use input types for variables. This should be caught during
// validation, however is checked again here for safety.
const varTypeStr = print(varDefNode.type);
errors.push(
new GraphQLError(
`Variable "$${varName}" expected value of type "${varTypeStr}" which cannot be used as an input type.`,
varDefNode.type,
),
);
continue;
}
if (!hasOwnProperty(inputs, varName)) {
if (varDefNode.defaultValue) {
coercedValues[varName] = valueFromAST(varDefNode.defaultValue, varType);
}
if (isNonNullType(varType)) {
const varTypeStr = inspect(varType);
errors.push(
new GraphQLError(
`Variable "$${varName}" of required type "${varTypeStr}" was not provided.`,
varDefNode,
),
);
}
continue;
}
const value = inputs[varName];
if (value === null && isNonNullType(varType)) {
const varTypeStr = inspect(varType);
errors.push(
new GraphQLError(
`Variable "$${varName}" of non-null type "${varTypeStr}" must not be null.`,
varDefNode,
),
);
continue;
}
const coerced = coerceValue(value, varType, varDefNode);
if (coerced.errors) {
for (const error of coerced.errors) {
error.message =
`Variable "$${varName}" got invalid value ${inspect(value)}; ` +
error.message;
}
errors.push(...coerced.errors);
continue;
}
coercedValues[varName] = coerced.value;
}
return errors.length === 0 ? { coerced: coercedValues } : { errors };
}
/**
* Prepares an object map of argument values given a list of argument
* definitions and list of argument AST nodes.
*
* Note: The returned value is a plain Object with a prototype, since it is
* exposed to user code. Care should be taken to not pull values from the
* Object prototype.
*/
export function getArgumentValues(
def: GraphQLField<mixed, mixed> | GraphQLDirective,
node: FieldNode | DirectiveNode,
variableValues?: ?ObjMap<mixed>,
): { [argument: string]: mixed, ... } {
const coercedValues = {};
const argNodeMap = keyMap(node.arguments || [], arg => arg.name.value);
for (const argDef of def.args) {
const name = argDef.name;
const argType = argDef.type;
const argumentNode = argNodeMap[name];
if (!argumentNode) {
if (argDef.defaultValue !== undefined) {
coercedValues[name] = argDef.defaultValue;
} else if (isNonNullType(argType)) {
throw new GraphQLError(
`Argument "${name}" of required type "${inspect(argType)}" ` +
'was not provided.',
node,
);
}
continue;
}
const valueNode = argumentNode.value;
let isNull = valueNode.kind === Kind.NULL;
if (valueNode.kind === Kind.VARIABLE) {
const variableName = valueNode.name.value;
if (
variableValues == null ||
!hasOwnProperty(variableValues, variableName)
) {
if (argDef.defaultValue !== undefined) {
coercedValues[name] = argDef.defaultValue;
} else if (isNonNullType(argType)) {
throw new GraphQLError(
`Argument "${name}" of required type "${inspect(argType)}" ` +
`was provided the variable "$${variableName}" which was not provided a runtime value.`,
valueNode,
);
}
continue;
}
isNull = variableValues[variableName] == null;
}
if (isNull && isNonNullType(argType)) {
throw new GraphQLError(
`Argument "${name}" of non-null type "${inspect(argType)}" ` +
'must not be null.',
valueNode,
);
}
const coercedValue = valueFromAST(valueNode, argType, variableValues);
if (coercedValue === undefined) {
// Note: ValuesOfCorrectType validation should catch this before
// execution. This is a runtime check to ensure execution does not
// continue with an invalid argument value.
throw new GraphQLError(
`Argument "${name}" has invalid value ${print(valueNode)}.`,
valueNode,
);
}
coercedValues[name] = coercedValue;
}
return coercedValues;
}
/**
* Prepares an object map of argument values given a directive definition
* and a AST node which may contain directives. Optionally also accepts a map
* of variable values.
*
* If the directive does not exist on the node, returns undefined.
*
* Note: The returned value is a plain Object with a prototype, since it is
* exposed to user code. Care should be taken to not pull values from the
* Object prototype.
*/
export function getDirectiveValues(
directiveDef: GraphQLDirective,
node: { +directives?: $ReadOnlyArray<DirectiveNode>, ... },
variableValues?: ?ObjMap<mixed>,
): void | { [argument: string]: mixed, ... } {
const directiveNode =
node.directives &&
find(
node.directives,
directive => directive.name.value === directiveDef.name,
);
if (directiveNode) {
return getArgumentValues(directiveDef, directiveNode, variableValues);
}
}
function hasOwnProperty(obj: mixed, prop: string): boolean {
return Object.prototype.hasOwnProperty.call(obj, prop);
}