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|
// @flow strict
import objectValues from '../polyfills/objectValues';
import type { Path } from '../jsutils/Path';
import inspect from '../jsutils/inspect';
import invariant from '../jsutils/invariant';
import didYouMean from '../jsutils/didYouMean';
import isObjectLike from '../jsutils/isObjectLike';
import safeArrayFrom from '../jsutils/safeArrayFrom';
import suggestionList from '../jsutils/suggestionList';
import printPathArray from '../jsutils/printPathArray';
import { addPath, pathToArray } from '../jsutils/Path';
import { GraphQLError } from '../error/GraphQLError';
import type { GraphQLInputType } from '../type/definition';
import {
isLeafType,
isInputObjectType,
isListType,
isNonNullType,
} from '../type/definition';
type OnErrorCB = (
path: $ReadOnlyArray<string | number>,
invalidValue: mixed,
error: GraphQLError,
) => void;
/**
* Coerces a JavaScript value given a GraphQL Input Type.
*/
export function coerceInputValue(
inputValue: mixed,
type: GraphQLInputType,
onError: OnErrorCB = defaultOnError,
): mixed {
return coerceInputValueImpl(inputValue, type, onError);
}
function defaultOnError(
path: $ReadOnlyArray<string | number>,
invalidValue: mixed,
error: GraphQLError,
): void {
let errorPrefix = 'Invalid value ' + inspect(invalidValue);
if (path.length > 0) {
errorPrefix += ` at "value${printPathArray(path)}"`;
}
error.message = errorPrefix + ': ' + error.message;
throw error;
}
function coerceInputValueImpl(
inputValue: mixed,
type: GraphQLInputType,
onError: OnErrorCB,
path: Path | void,
): mixed {
if (isNonNullType(type)) {
if (inputValue != null) {
return coerceInputValueImpl(inputValue, type.ofType, onError, path);
}
onError(
pathToArray(path),
inputValue,
new GraphQLError(
`Expected non-nullable type "${inspect(type)}" not to be null.`,
),
);
return;
}
if (inputValue == null) {
// Explicitly return the value null.
return null;
}
if (isListType(type)) {
const itemType = type.ofType;
const coercedList = safeArrayFrom(inputValue, (itemValue, index) => {
const itemPath = addPath(path, index, undefined);
return coerceInputValueImpl(itemValue, itemType, onError, itemPath);
});
if (coercedList != null) {
return coercedList;
}
// Lists accept a non-list value as a list of one.
return [coerceInputValueImpl(inputValue, itemType, onError, path)];
}
if (isInputObjectType(type)) {
if (!isObjectLike(inputValue)) {
onError(
pathToArray(path),
inputValue,
new GraphQLError(`Expected type "${type.name}" to be an object.`),
);
return;
}
const coercedValue = {};
const fieldDefs = type.getFields();
for (const field of objectValues(fieldDefs)) {
const fieldValue = inputValue[field.name];
if (fieldValue === undefined) {
if (field.defaultValue !== undefined) {
coercedValue[field.name] = field.defaultValue;
} else if (isNonNullType(field.type)) {
const typeStr = inspect(field.type);
onError(
pathToArray(path),
inputValue,
new GraphQLError(
`Field "${field.name}" of required type "${typeStr}" was not provided.`,
),
);
}
continue;
}
coercedValue[field.name] = coerceInputValueImpl(
fieldValue,
field.type,
onError,
addPath(path, field.name, type.name),
);
}
// Ensure every provided field is defined.
for (const fieldName of Object.keys(inputValue)) {
if (!fieldDefs[fieldName]) {
const suggestions = suggestionList(
fieldName,
Object.keys(type.getFields()),
);
onError(
pathToArray(path),
inputValue,
new GraphQLError(
`Field "${fieldName}" is not defined by type "${type.name}".` +
didYouMean(suggestions),
),
);
}
}
return coercedValue;
}
// istanbul ignore else (See: 'https://github.com/graphql/graphql-js/issues/2618')
if (isLeafType(type)) {
let parseResult;
// Scalars and Enums determine if a input value is valid via parseValue(),
// which can throw to indicate failure. If it throws, maintain a reference
// to the original error.
try {
parseResult = type.parseValue(inputValue);
} catch (error) {
if (error instanceof GraphQLError) {
onError(pathToArray(path), inputValue, error);
} else {
onError(
pathToArray(path),
inputValue,
new GraphQLError(
`Expected type "${type.name}". ` + error.message,
undefined,
undefined,
undefined,
undefined,
error,
),
);
}
return;
}
if (parseResult === undefined) {
onError(
pathToArray(path),
inputValue,
new GraphQLError(`Expected type "${type.name}".`),
);
}
return parseResult;
}
// istanbul ignore next (Not reachable. All possible input types have been considered)
invariant(false, 'Unexpected input type: ' + inspect((type: empty)));
}
|
