graphql-scalars
Version:
A collection of scalar types not included in base GraphQL.
73 lines (72 loc) • 2.93 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.GraphQLRoutingNumber = exports.GraphQLRoutingNumberConfig = void 0;
const graphql_1 = require("graphql");
const error_js_1 = require("../error.js");
const routingNumber = (rtn) => '' + rtn;
const haveNineDigits = rtn => /^\d{9}$/.test(rtn);
/**
* Calculates checksum for MIRC format XXXXYYYYC where C is the check digit
*
* The checksum is position-weighted sum of each of the digits. So, given the
* routing number `031001175`, which The last digit (5 in the example), is the
* check digit. The calculation is given in terms of the eight first digits:
*
* 0 3 1 0 0 1 1 7
* x
* 3 7 1 3 7 1 3 7
* ____________________________________
* 0 + 21 + 1 + 0 + 0 + 1 + 3 + 49 = 75
* ____________________________________
* 75 + 5 (check digit) = 80 (Must multiple of 10)
*/
const checksum = rtn => {
const weight = [3, 7, 1];
const accumulator = (acc, curr) => acc + curr;
const digits = rtn.split('').map(digit => Number.parseInt(digit, 10));
const checkDigit = digits.pop();
const sum = digits.map((digit, index) => digit * weight[index % 3]).reduce(accumulator, 0);
return (sum + checkDigit) % 10 === 0;
};
const validate = (value, ast) => {
if (typeof value !== 'string' && !(typeof value === 'number' && Number.isInteger(value))) {
throw (0, error_js_1.createGraphQLError)('must be integer or string', ast ? { nodes: ast } : undefined);
}
const rtn = routingNumber(value);
if (!haveNineDigits(rtn)) {
throw (0, error_js_1.createGraphQLError)('must have nine digits', ast ? { nodes: ast } : undefined);
}
if (!checksum(rtn)) {
throw (0, error_js_1.createGraphQLError)("checksum doesn't match", ast ? { nodes: ast } : undefined);
}
return rtn;
};
exports.GraphQLRoutingNumberConfig = {
name: 'RoutingNumber',
description: 'In the US, an ABA routing transit number (`ABA RTN`) is a nine-digit ' +
'code to identify the financial institution.',
specifiedByURL: 'https://en.wikipedia.org/wiki/ABA_routing_transit_number',
serialize(value) {
return validate(value);
},
parseValue(value) {
return validate(value);
},
parseLiteral(ast) {
if (ast.kind === graphql_1.Kind.INT || ast.kind === graphql_1.Kind.STRING) {
return validate(ast.value, ast);
}
throw (0, error_js_1.createGraphQLError)(`ABA Routing Transit Number can only parse Integer or String but got '${ast.kind}'`, {
nodes: ast,
});
},
extensions: {
codegenScalarType: 'string',
jsonSchema: {
title: 'RoutingNumber',
type: 'string',
pattern: /^\d{9}$/.source,
},
},
};
exports.GraphQLRoutingNumber = new graphql_1.GraphQLScalarType(exports.GraphQLRoutingNumberConfig);