Marc Mintel
5397309103
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70 lines
2.7 KiB
Plaintext
70 lines
2.7 KiB
Plaintext
import { GraphQLScalarType, Kind } from 'graphql';
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import { createGraphQLError } from '../error.js';
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const routingNumber = (rtn) => '' + rtn;
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const haveNineDigits = rtn => /^\d{9}$/.test(rtn);
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/**
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* Calculates checksum for MIRC format XXXXYYYYC where C is the check digit
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*
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* The checksum is position-weighted sum of each of the digits. So, given the
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* routing number `031001175`, which The last digit (5 in the example), is the
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* check digit. The calculation is given in terms of the eight first digits:
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*
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* 0 3 1 0 0 1 1 7
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* x
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* 3 7 1 3 7 1 3 7
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* ____________________________________
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* 0 + 21 + 1 + 0 + 0 + 1 + 3 + 49 = 75
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* ____________________________________
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* 75 + 5 (check digit) = 80 (Must multiple of 10)
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*/
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const checksum = rtn => {
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const weight = [3, 7, 1];
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const accumulator = (acc, curr) => acc + curr;
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const digits = rtn.split('').map(digit => Number.parseInt(digit, 10));
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const checkDigit = digits.pop();
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const sum = digits.map((digit, index) => digit * weight[index % 3]).reduce(accumulator, 0);
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return (sum + checkDigit) % 10 === 0;
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};
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const validate = (value, ast) => {
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if (typeof value !== 'string' && !(typeof value === 'number' && Number.isInteger(value))) {
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throw createGraphQLError('must be integer or string', ast ? { nodes: ast } : undefined);
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}
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const rtn = routingNumber(value);
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if (!haveNineDigits(rtn)) {
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throw createGraphQLError('must have nine digits', ast ? { nodes: ast } : undefined);
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}
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if (!checksum(rtn)) {
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throw createGraphQLError("checksum doens't match", ast ? { nodes: ast } : undefined);
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}
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return rtn;
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};
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export const GraphQLRoutingNumberConfig = {
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name: 'RoutingNumber',
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description: 'In the US, an ABA routing transit number (`ABA RTN`) is a nine-digit ' +
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'code to identify the financial institution.',
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specifiedByURL: 'https://en.wikipedia.org/wiki/ABA_routing_transit_number',
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serialize(value) {
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return validate(value);
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},
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parseValue(value) {
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return validate(value);
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},
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parseLiteral(ast) {
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if (ast.kind === Kind.INT || ast.kind === Kind.STRING) {
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return validate(ast.value, ast);
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}
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throw createGraphQLError(`ABA Routing Transit Number can only parse Integer or String but got '${ast.kind}'`, {
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nodes: ast,
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});
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},
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extensions: {
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codegenScalarType: 'string',
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jsonSchema: {
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title: 'RoutingNumber',
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type: 'string',
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pattern: /^\d{9}$/.source,
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},
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},
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};
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export const GraphQLRoutingNumber = /*#__PURE__*/ new GraphQLScalarType(GraphQLRoutingNumberConfig);
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